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WO2018147334A1 - Film de polypropylène à orientation biaxiale - Google Patents

Film de polypropylène à orientation biaxiale Download PDF

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Publication number
WO2018147334A1
WO2018147334A1 PCT/JP2018/004241 JP2018004241W WO2018147334A1 WO 2018147334 A1 WO2018147334 A1 WO 2018147334A1 JP 2018004241 W JP2018004241 W JP 2018004241W WO 2018147334 A1 WO2018147334 A1 WO 2018147334A1
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WO
WIPO (PCT)
Prior art keywords
film
biaxially oriented
oriented polypropylene
less
mass
Prior art date
Application number
PCT/JP2018/004241
Other languages
English (en)
Japanese (ja)
Inventor
久万　琢也
一馬 岡田
康平 山中
大倉　正寿
Original Assignee
東レ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東レ株式会社 filed Critical 東レ株式会社
Priority to CN201880007838.XA priority Critical patent/CN110225937B/zh
Priority to KR1020197016943A priority patent/KR102455834B1/ko
Priority to JP2018533286A priority patent/JP7003920B2/ja
Publication of WO2018147334A1 publication Critical patent/WO2018147334A1/fr
Priority to JP2021210416A priority patent/JP7205611B2/ja

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/241—Polyolefin, e.g.rubber
    • C09J7/243—Ethylene or propylene polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene

Definitions

  • the present invention relates to a polypropylene film excellent in surface smoothness and transparency and excellent in slipping property, handling property and winding property, and an adhesive film roll using the polypropylene film.
  • Polypropylene films are excellent in transparency, mechanical properties, electrical properties, etc., and are therefore used in various applications such as packaging, mold release, tape, cable wrapping and electrical applications such as capacitors.
  • it since it has excellent surface releasability and mechanical properties, it is suitably used as a release film or process film for various members such as plastic products, building materials and optical members.
  • the required characteristics for the release film are set as appropriate depending on the intended use, but due to the recent downsizing and higher precision of equipment, products to be protected may be required to be thin and high-grade. If the surface smoothness of the polypropylene film is poor, for example, when used as a release film for an optical member, the surface irregularities of the film may be transferred to the optical member and affect the visibility of the product. Moreover, if the transparency of the polypropylene film is poor, it may become an obstacle when performing a process inspection such as defect observation after bonding with a product.
  • films with excellent surface smoothness and transparency are generally poorly slidable, and wrinkles may be generated or handling properties may be reduced during the transport process, winding process, and post-processing process during film formation. there were.
  • Patent Documents 1 to 3 describe examples in which easy-slip particles are used for the film surface layer.
  • Patent Document 4 describes an example in which an ethylene resin is added to form irregularities on the surface.
  • Patent Documents 5 to 8 describe examples in which an olefin resin containing 4-methylpentene-1 unit is used for the film surface layer.
  • Patent Documents 1 to 3 polypropylene has a low releasability and thus has a low affinity with particles.
  • the particles When the particles are dropped in the film forming process or the post-processing process, or when used as a release film or process film, Particles sometimes adhered to the product.
  • Patent Documents 1 and 2 have high haze and are not sufficiently transparent, and thus may not be used in the step of detecting defects.
  • patent document 3 is excellent in transparency, since the particle diameter of the particle
  • Patent Document 4 the surface smoothness of the back surface is insufficient, and the shape of the back surface may be transferred to the product when it is attached to the product and wound.
  • the slipperiness is insufficient and defects such as air biting are likely to occur when winding is difficult, such as when the adhesive layer is applied and used as a protective film.
  • Patent Documents 5 and 6 since the addition concentration of the olefin resin containing 4-methylpentene-1 unit is as high as 5% or more, the protrusion on the film surface becomes coarse, and an adhesive layer is applied to form a protective film. When it is difficult to wind up, such as when it is used, defects such as air biting may be likely to occur, and since the haze of the film is high, defect detection may not be performed.
  • Patent Documents 7 and 8 although the addition concentration of the olefin resin containing 4-methylpentene-1 unit is low, the extrusion temperature and the casting drum temperature are high, and the protrusion on the film surface becomes coarse, and the product is stuck to the product. When wound together, the shape of the back surface may be transferred to the product.
  • an object of the present invention is to solve the above-mentioned problems. That is, an object of the present invention is to provide a polypropylene film that is excellent in surface smoothness and transparency, and excellent in slipping property, handling property and winding property.
  • the biaxially oriented polypropylene film of the present invention has a maximum height roughness of one side of the biaxially oriented polypropylene film of Sz1, and a maximum height roughness of the other side.
  • Sz2 (where Sz1 ⁇ Sz2)
  • Sz1 is 50 to 500 nm
  • at least one side has a long side of 10 ⁇ m or less
  • a height of 50 to 200 nm is present at a frequency of 5 or more in a 100 ⁇ m square. It is characterized by doing.
  • the biaxially oriented polypropylene film of the present invention is excellent in surface smoothness and transparency, and is excellent in slipperiness, handling properties and winding properties. It can be suitably used as a film for use.
  • the maximum height roughness of one surface is Sz1
  • the maximum height roughness of the other surface is Sz2 (where Sz1 ⁇ Sz2)
  • Sz1 is 50 to 500 nm. is there.
  • the maximum height roughness represents the sum of the maximum mountain height and the maximum valley depth.
  • Sz1 is more preferably 50 to 400 nm, still more preferably 100 to 300 nm, and further preferably 120 to 280 nm.
  • Sz1 is less than 50 nm, the film surface is too smooth, and handling properties and winding properties may be reduced when the formed film is conveyed or wound.
  • Sz1 exceeds 500 nm, when used as a base film or a cover film, irregularities may be transferred to the surface of the product.
  • the raw material composition of the film and the laminated structure of the film are in the range described later, and the cast (melt-extruded resin sheeting process) conditions and longitudinal stretching conditions in film formation are described later. It is preferable that the ⁇ crystal of the cast sheet is reduced. Further, it is particularly preferable to control the dispersion of the resin by setting the blending condition of the polypropylene resin and the other resin and the conditions at the time of melt extrusion within the ranges described later. However, when the values of the maximum height roughness of both surfaces are equal, the maximum height roughness of the contact surface with the casting drum is Sz1.
  • the biaxially oriented polypropylene film of the present invention has at least 5 protrusions on one side with a long side of 10 ⁇ m or less and a height of 50 to 200 nm in a 100 ⁇ m square.
  • air biting and air detachability when winding the film are appropriately controlled, and a smooth film can be wound cleanly without wrinkles.
  • a pressure-sensitive adhesive layer is applied to a biaxially oriented polypropylene film and the film roll is wound without using a release film, the coefficient of friction increases, so that wrinkles are likely to occur during winding. Since the back surface of the polypropylene film is in contact with the surface of the adhesive layer, the surface shape of the back surface has a great effect on the winding property.
  • the contact area between the surface of the adhesive layer and the back surface can be reduced. It has been found that winding is difficult and winding property is good.
  • the surface of the polypropylene film has coarse protrusions such as fibrils and smooth parts, but the coarse protrusions such as fibrils have a large long diameter, are in surface contact with the adhesive layer, do not contribute much to the winding property, and air biting, etc. In some cases, defects are likely to occur. It has been found that the winding property can be improved while maintaining smoothness by allowing a number of minute protrusions having a specific protrusion height and major axis that can make point contact with the adhesive layer in the smooth portion.
  • the protrusion frequency is more preferably 7 or more, further preferably 10 or more, particularly preferably 50 or more, and most preferably 100 or more.
  • the protrusion frequency is less than 5, it may not contribute to the improvement of slipperiness and the winding property may be lowered.
  • the composition and adjustment method of the raw material of the film, the laminated structure of the film, the casting (melt-extruded resin sheeting process) condition and the longitudinal stretching condition during film formation Is effectively within the range described below.
  • the biaxially oriented polypropylene film of the present invention has a maximum height roughness Sz2 when the maximum height roughness of one surface is Sz1 and the maximum height roughness of the other surface is Sz2 (where Sz1 ⁇ Sz2). Is preferably 100 to 1000 nm. Sz2 is more preferably 200 to 800 nm, still more preferably 300 to 700 nm, still more preferably 500 to 700 nm. When Sz2 is less than 100 nm, the film surface is too smooth, and handling properties and winding properties may be reduced when the formed film is conveyed or wound. When Sz2 exceeds 1000 nm, when used as a substrate film or a cover film, irregularities may be transferred to the surface of the product.
  • the raw material composition of the film and the laminated structure of the film are in the ranges described later, and the cast (melt-extruded resin sheeting process) conditions and longitudinal stretching conditions during film formation are described later. It is preferable that the ⁇ crystal of the cast sheet is reduced.
  • the biaxially oriented polypropylene film of the present invention preferably has a value of Sz2 / Sz1 of 1 or more and 3 or less. More preferably, it is 1.5 or more and 3 or less.
  • Sz2 / Sz1 exceeds 3 when Sz1 is too small and the film surface is too smooth and the film-formed film is transported or wound up, handling properties and winding properties are reduced, or Sz2 Is too large, and when used as a base film or a cover film, irregularities may be transferred to the surface of the product.
  • the raw material composition of the film and the laminated structure of the film are set in the ranges described later, and the casting (melt-extruded resin sheet forming process) conditions and longitudinal It is preferable that the stretching condition is within the range described later to reduce the ⁇ crystal of the cast sheet.
  • the number of fish eyes is preferably 20 / m 2 or less.
  • the number of fish eyes is more preferably 10 / m 2 or less, still more preferably 5 / m 2 or less. If the number of fish eyes exceeds 20 / m 2 , the yield may decrease when used as a protective film or a base film for production of a product such as a display member that requires high quality.
  • the composition of the raw materials, the adjustment method, and the laminated structure of the film are within the ranges described later, and the additive components in the raw materials and heat deterioration may cause fish eyes. It is effective to reduce the amount of resin used. Moreover, it is effective to set the conditions during film formation within the range described later, and to remove foreign substances by filtration and to reduce the staying part of the resin before the raw material is melted into a sheet.
  • the biaxially oriented polypropylene film of the present invention preferably has a haze of 1% or less. More preferably, it is 0.9% or less, More preferably, it is 0.8% or less, More preferably, it is 0.7% or less.
  • the haze exceeds 1%, the surface roughness of the film surface is large, and the surface shape may be transferred to the adherend.
  • defect detection may not be performed in a state of being bonded to the product.
  • the haze is preferably as low as possible from the viewpoint of transparency, but in practice, the lower limit is about 0.05%.
  • the raw material composition of the film and the laminated structure of the film are set in a range described later to prevent deterioration of transparency due to particles and the like, and the casting conditions and longitudinal stretching conditions during film formation are described later. It is preferable that the ⁇ crystal of the cast sheet is reduced.
  • the cast drum temperature after extrusion may be rapidly cooled to 30 ° C. or lower in order to improve the transparent smoothness of the film.
  • a method of kneading in advance with a twin screw extruder to form chips is particularly preferable.
  • Biaxially oriented polypropylene film of the present invention is preferably the longitudinal direction of the Young's modulus E MD is not less than 1 GPa.
  • E MD is more preferably 1.2GPa or more, more preferably at least 1.4 GPa.
  • EMD is preferably as strong as possible, but the upper limit is substantially about 10 GPa. The value of E MD to the above range, the range to be described later raw material composition of the film, also a range to be described later deposition conditions, to obtain a base film of the film was biaxially stretched at a high magnification Is preferred.
  • the biaxially oriented polypropylene film of the present invention preferably has a Young's modulus E TD in the width direction of 1 GPa or more.
  • E TD is less than 1 GPa, or become a film easily wrinkles on during transport, wound into a roll is pasted to a film as an adherend, such as wrinkles on the roll by the dimensional change of the film upon storage May occur.
  • E TD is more preferably 1.5 GPa or more, further preferably 2.0 GPa or more, and further preferably 2.5 GPa or more.
  • ETD is preferably as strong as possible, but the upper limit is substantially about 10 GPa.
  • the raw material composition of the film is set in the range described later, and the film forming conditions are set in the range described below, and the base film is obtained by biaxially stretching the film at a high magnification. Is preferred.
  • a direction parallel to the film forming direction is referred to as a film forming direction, a longitudinal direction, or an MD direction, and a direction perpendicular to the film forming direction in the film plane is referred to as a width direction or a TD direction.
  • the biaxially oriented polypropylene film of the present invention preferably has a heat shrinkage ratio of 1.0% or less after heat treatment at 110 ° C. in the width direction. More preferably, it is 0.8% or less, More preferably, it is 0.5% or less, More preferably, it is 0.3% or less.
  • the heat shrinkage in the width direction exceeds 1.0%, for example, after bonding with other materials as a protective film or a cover film, the film is deformed when passing through a drying process or the like where heat is applied. May peel or wrinkle.
  • wrinkles or the like may occur on the roll due to a dimensional change of the film.
  • the lower limit of the heat shrinkage rate is not particularly limited, but the film may swell, and the lower limit is substantially about ⁇ 2.0%.
  • the raw material composition of the film is set in the range described later, and the film forming conditions are set in the range described below, and in particular, the heat fixing and relaxation conditions after biaxial stretching are set in the range described below. Is effective.
  • the heat shrinkage rate refers to a film with a width of 10 mm and a length of 200 mm (measurement direction) cut out in the width direction of the film.
  • the distance between the marked lines was measured to obtain a test length (l 0 ), and then the test piece was sandwiched between papers and taken out after heating for 60 minutes in an oven kept at 110 ° C. with no load, and cooled at room temperature.
  • the dimension (l 1 ) was measured with a universal projector and obtained by the following formula, and the average value of the five was taken as the heat shrinkage rate.
  • Thermal contraction rate ⁇ (l 0 ⁇ l 1 ) / l 0 ⁇ ⁇ 100 (%).
  • the thickness of the biaxially oriented polypropylene film of the present invention is appropriately adjusted depending on the application and is not particularly limited, but is preferably 5 ⁇ m or more and 100 ⁇ m or less. When the thickness is less than 5 ⁇ m, handling may be difficult, and when it exceeds 100 ⁇ m, the amount of resin may increase and productivity may decrease. Since the biaxially oriented polypropylene film of the present invention is excellent in strength (Young's modulus) even when the thickness is reduced, the handling property can be maintained. In order to make use of such characteristics, the thickness is more preferably 5 ⁇ m or more and 40 ⁇ m or less, further preferably 5 ⁇ m or more and 30 ⁇ m or less, and most preferably 5 ⁇ m or more and 25 ⁇ m or less. The thickness can be adjusted by the screw rotation speed of the extruder, the width of the unstretched sheet, the film forming speed, the stretch ratio, and the like within a range not deteriorating other physical properties.
  • the biaxially oriented polypropylene film of the present invention may be a single-layer film or a laminated film of two or more layers as long as the above properties are satisfied, but from the viewpoint of both transparency and slipperiness. It is preferable to have a laminated structure of at least two layers.
  • the biaxially oriented polypropylene film of the present invention is a film mainly composed of polypropylene.
  • the “main component” in the present invention means that the proportion of a specific component in all components is 50% by mass or more, more preferably 90% by mass or more, and still more preferably 95% by mass or more. More preferably, it is 96 mass% or more, More preferably, it is 97 mass% or more, More preferably, it is 98 mass% or more.
  • polypropylene raw material used for the biaxially oriented polypropylene film of the present invention is not particularly limited as long as the physical properties described above are satisfied, but it is preferable to use crystalline polypropylene (hereinafter, polypropylene raw material A) from the viewpoint of strength and heat resistance.
  • the polypropylene raw material A is preferably a polypropylene having a cold xylene soluble part (hereinafter referred to as CXS) of 4% by mass or less and a mesopentad fraction of 0.90 or more. If these conditions are not satisfied, film forming stability may be inferior, film strength may be reduced, and dimensional stability and heat resistance may be greatly reduced.
  • CXS cold xylene soluble part
  • the cold xylene soluble part means a polypropylene component dissolved in xylene when the sample is completely dissolved in xylene and then precipitated at room temperature, and has low stereoregularity. This is considered to correspond to a component that is difficult to crystallize due to a low molecular weight. If many such components are contained in the resin, the thermal dimensional stability of the film may be inferior. Therefore, CXS is preferably 4% by mass or less, more preferably 3% by mass or less, and particularly preferably 2% by mass or less. CXS is preferably as low as possible, but about 0.1% by mass is the lower limit.
  • CXS-containing polypropylene In order to obtain such CXS-containing polypropylene, methods such as a method for enhancing the catalytic activity in obtaining a resin, a method for washing the obtained resin with a solvent or propylene monomer itself, a method using a metallocene PP, and the like can be used.
  • the mesopentad fraction of the polypropylene raw material A is preferably 0.90 or more, more preferably 0.94 or more.
  • the mesopentad fraction is an index indicating the stereoregularity of the crystal phase of polypropylene measured by a nuclear magnetic resonance method (NMR method).
  • NMR method nuclear magnetic resonance method
  • the upper limit of the mesopentad fraction is not particularly specified.
  • a method of washing resin powder obtained with a solvent such as n-heptane there are a method of appropriately selecting a catalyst and / or a promoter, and a composition. Preferably employed.
  • the polypropylene raw material A more preferably has a melt flow rate (MFR) of 1 to 10 g / 10 minutes (230 ° C., 21.18 N load), particularly preferably 2 to 5 g / 10 minutes (230 ° C., 21.18 N).
  • MFR melt flow rate
  • the range of (load) is preferable from the viewpoint of film forming properties and film strength.
  • a method of controlling the average molecular weight or the molecular weight distribution is employed.
  • the polypropylene raw material A may contain other unsaturated hydrocarbon copolymerization components or the like as long as the object of the present invention is not impaired, or may be blended with a polymer that is not propylene alone.
  • the copolymerization amount or blend amount is preferably less than 1 mol% in copolymerization amount and less than 10 mass% in blend
  • the biaxially oriented polypropylene film of the present invention may contain branched polypropylene H in addition to the polypropylene raw material A described above from the viewpoint of improving strength and improving dimensional stability.
  • the branched polypropylene H as used herein is a polypropylene having a branched structure of 5 or less per 10,000 carbon atoms. The presence of this branched structure can be confirmed by the proton ratio in the 1 H-NMR spectrum. In the case of inclusion, it is preferably 0.05 to 10% by mass, more preferably 0.5 to 8% by mass, and still more preferably 1 to 5% by mass.
  • the size of the spherulite produced in the cooling (casting) step of the melt-extruded resin sheet can be controlled to be small, and a polypropylene film excellent in transparency, strength and surface smoothness can be obtained. it can.
  • the melt flow rate (MFR) is preferably in the range of 1 to 20 g / 10 minutes from the viewpoint of film forming properties, and more preferably in the range of 1 to 10 g / 10 minutes. preferable.
  • the melt tension is preferably in the range of 1 to 30 cN, more preferably in the range of 2 to 20 cN.
  • the content of the ethylene component contained in the polypropylene polymer constituting the film is preferably 10% by mass or less. More preferably, it is 5 mass% or less, More preferably, it is 3 mass% or less.
  • the content of the ethylene component increases, the crystallinity decreases and the transparency is easily improved.
  • the strength decreases or the heat resistance decreases and heat increases.
  • the shrinkage rate may deteriorate.
  • the resin is likely to deteriorate during the extrusion process, and fish eyes in the film are likely to be generated.
  • the content of the ethylene component may be 0%, it is preferably contained in an amount of 0.1% or more from the viewpoint that the crystallinity is lowered and the transparency is easily improved.
  • the content of the polypropylene polymer contained in the polymer constituting the film is preferably 95% by mass or more from the viewpoint of transparency, heat resistance and strength. More preferably, it is 96 mass% or more, More preferably, it is 97 mass% or more, More preferably, it is 98 mass% or more.
  • the biaxially oriented polypropylene film of the present invention preferably contains a resin having a melting point of 180 ° C. or higher (hereinafter referred to as a high melting point resin).
  • the melting point is more preferably 180 ° C. or higher and 240 ° C. or lower.
  • the film is composed of at least two layers of the surface layer (I) and the base layer (II), and the surface layer (I) preferably contains a high melting point resin.
  • the high melting point resin is present in the surface layer (I)
  • the high melting point resin is preferably an olefin resin, but among the olefin resins, an olefin resin containing 4-methylpentene-1 units is particularly preferable as a main component. Since the resin containing 4-methylpentene-1 unit has a higher affinity with a polypropylene resin than a non-olefin resin, dispersibility can be improved.
  • the olefin resin containing 4-methylpentene-1 unit include “TPX” (registered trademark) DX310, “TPX” (registered trademark) DX231, “TPX” (registered trademark) manufactured by Mitsui Chemicals, Inc. An example is MX004.
  • the content of the olefin resin comprising 4-methylpentene-1 unit in the resin composition of the surface layer (I) is 0.1 to 4.5% by mass. It is preferably 0.1 to 4% by mass, more preferably 0.1 to 3% by mass, and still more preferably 0.1 to 2.5% by mass.
  • the projections may form a mountain range that is long in the longitudinal direction, and the long side of the projections formed exceeds 10 ⁇ m.
  • the height of the protrusion may exceed 200 nm, and when used as a base film or cover film, unevenness may be transferred to the surface of the product, or the biaxially oriented polypropylene film of the present invention may have an adhesive layer
  • the content is less than 0.1% by mass, the frequency of the formed protrusions becomes too low, which does not contribute to the improvement of slipperiness and the winding property may be lowered.
  • a high melting point resin in the surface layer of the biaxially oriented polypropylene film of the present invention, in order to make the projections formed on the film surface fine, blending conditions of the high melting point resin and the polypropylene resin, and It is very important to control the melt extrusion conditions during film formation.
  • the raw material used for the surface layer of the biaxially oriented polypropylene film of the present invention is a blend of a high melting point resin and a polypropylene resin, but it is preferable to knead in advance with a biaxial extruder to make a chip.
  • the kneading temperature is preferably higher than the melting point of the high melting point resin from the viewpoint of dispersion uniformity, more preferably 10 ° C. or higher, and further preferably 20 ° C. or higher.
  • the kneading temperature is lower than the melting point of the high melting point resin, the dispersibility may be lowered and the protrusions may be coarse.
  • the upper limit of the kneading temperature is not particularly defined, but if it is too high, thermal decomposition of the polypropylene resin may occur, and the upper limit is 280 ° C.
  • the extrusion temperature during melt extrusion of the biaxially oriented polypropylene film of the present invention is preferably not higher than the melting point of the high melting point resin. More preferably, it is 10 degrees C or less, and 20 degrees C or less is still more preferable.
  • the high-melting resin uniformly and finely dispersed in the polypropylene resin may be melted and coalesced, or may be elongated for a long time due to shear flow during extrusion. As a result, the projection on the film surface may be coarse or the long side may exceed 10 ⁇ m.
  • the lower limit of the melting temperature is not particularly defined, but if it is too low, an increase in the filtration pressure during extrusion or unmelted polypropylene resin may occur, and 200 ° C. is the lower limit.
  • various additives such as a crystal nucleating agent, an antioxidant, a heat stabilizer, a slip agent, an antistatic agent, and a blocking agent are used as long as the object of the present invention is not impaired.
  • An inhibitor, a filler, a viscosity modifier, an anti-coloring agent, and the like can also be included.
  • the selection of the type and amount of antioxidant is important from the viewpoint of the bleedout of the antioxidant. That is, the antioxidant is a phenolic compound having steric hindrance, and at least one of them is preferably a high molecular weight type having a molecular weight of 500 or more.
  • BHT 2,6-di-t-butyl-p-cresol
  • 1,3,5-trimethyl-2,4,6- Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene for example “Irganox” (registered trademark) 1330: molecular weight 775.2 manufactured by BASF
  • tetrakis [methylene-3 (3,5-di- t-butyl-4-hydroxyphenyl) propionate] methane for example, “Irganox” (registered trademark) 1010: molecular weight 1177.7 manufactured by BASF
  • Irganox registered trademark 1010: molecular weight 1177.7 manufactured by BASF
  • the total content of these antioxidants is preferably in the range of 0.03 to 1.0 mass% with respect to the total amount of the polypropylene raw material.
  • a polymer may deteriorate in an extrusion process and a film may color, or it may be inferior to long-term heat resistance.
  • transparency may fall by the bleeding out of these antioxidants.
  • a more preferable content is 0.05 to 0.9% by mass, and particularly preferably 0.1 to 0.8% by mass.
  • a crystal nucleating agent can be added to the polypropylene raw material used for the biaxially oriented polypropylene film of the present invention as long as it does not contradict the purpose of the present invention.
  • the branched polypropylene (H) has an ⁇ -crystal or ⁇ -crystal nucleating agent effect itself, but other ⁇ -crystal nucleating agents (dibenzylidene sorbitols, sodium benzoate, etc.) ), ⁇ crystal nucleating agents (amide compounds such as potassium 1,2-hydroxystearate, magnesium benzoate, N, N′-dicyclohexyl-2,6-naphthalenedicarboxamide, quinacridone compounds, etc.), etc. .
  • the addition amount is usually 0.5% by mass or less, preferably 0.1%. It is preferable to set it as mass% or less, More preferably, it is 0.05 mass% or less.
  • the biaxially oriented polypropylene film of the present invention preferably does not contain organic particles and inorganic particles.
  • Polypropylene has low affinity with organic particles and inorganic particles, so when used in a biaxially stretched film, voids are generated in the stretching process and transparency is deteriorated, or the particles fall off and contaminate the process or product. Therefore, when it is used as a protective film for a product such as a display member that requires high quality or a base film for production, it is preferable not to contain a lubricant such as organic particles or inorganic particles.
  • the biaxially oriented polypropylene film of the present invention is obtained by biaxially stretching using the above-described raw materials.
  • the biaxial stretching method can be obtained by any of the inflation simultaneous biaxial stretching method, the stenter simultaneous biaxial stretching method, and the stenter sequential biaxial stretching method.
  • a laminated unstretched sheet having a layer configuration of layer / B layer / A layer is obtained.
  • the lamination thickness ratio is preferably 1/8/1 to 1/50/1.
  • the surface temperature of the casting drum is preferably 10 to 40 ° C. from the viewpoint of transparency. Moreover, it does not matter as a 2 layer laminated structure of A layer / B layer.
  • any method can be used as an adhesion method to the casting drum, such as an electrostatic application method, an adhesion method using the surface tension of water, an air knife method, a press roll method, an underwater casting method, etc.
  • an air knife method capable of controlling the surface roughness is preferable.
  • the air temperature of the air knife is 0 to 50 ° C., preferably 0 to 30 ° C., and the blowing air speed is preferably 130 to 150 m / s. Further, it is preferable to appropriately adjust the position of the air knife so that air flows on the downstream side of the film formation so as not to cause vibration of the film.
  • the non-casting drum surface of the film is further forcibly cooled to suppress the formation of ⁇ crystals on the non-casting drum surface, thereby improving the smoothness and transparency of the film.
  • the cooling method of the non-casting drum surface may be any of air cooling, press roll method, underwater casting method, etc., but it is simple as equipment, easy to control surface roughness, and smooth. Air cooling with good air is preferable.
  • the obtained unstretched sheet is introduced into the longitudinal stretching step.
  • a non-stretched sheet is brought into contact with a plurality of metal rolls maintained at 120 ° C. or higher and lower than 150 ° C., preferably 140 ° C. or higher and lower than 150 ° C., more preferably 144 ° C. or higher and lower than 149 ° C.
  • the temperature is raised to 3 to 8 times in the longitudinal direction between rolls having a difference in peripheral speed, and then cooled to room temperature.
  • the preheating temperature is less than 120 ° C.
  • the stretching temperature is 150 ° C. or more, the orientation of the film becomes weak and the strength may decrease.
  • the orientation of the film becomes weak and the strength may be lowered.
  • the temperature of the roll having a high speed on the downstream side among the rolls provided with the difference in peripheral speed is lower by 10 ° C. or more than the temperature of the upstream roll. If the temperature difference is less than 10 ° C., the protrusions formed on the film surface have a mountain range that is long in the longitudinal direction, and the long sides of the protrusions that are formed may exceed 10 ⁇ m.
  • the temperature of the upstream roll is preferably 120 ° C. or higher and lower than 150 ° C.
  • the temperature of the downstream roll is more preferably 30 ° C. or higher and lower than 100 ° C.
  • the longitudinally uniaxially stretched film is guided to a tenter, the end of the film is gripped with a clip, and the film is horizontally stretched 7 to 13 times in the width direction at a temperature of 140 to 165 ° C. If the stretching temperature is low, the film may be broken or the transparency may be lowered. If the stretching temperature is too high, the orientation of the film is weak and the strength may be lowered. Further, when the magnification is high, the film may be broken, and when the magnification is low, the orientation of the film is weak and the strength may be lowered.
  • the clip is heat-fixed at a temperature of 100 ° C. or more and less than 160 ° C. while being relaxed at a relaxation rate of 2 to 20% in the width direction while holding the tension in the width direction with the clip.
  • the film is guided to the outside of the tenter through a cooling process at 80 to 100 ° C. while being held tightly, the clip at the end of the film is released, the film edge is slit in the winder process, and the film product roll is wound up.
  • the biaxially oriented polypropylene film obtained as described above can be used in various applications such as packaging films, surface protective films, process films, hygiene products, agricultural products, building products, and medical products. Since it is excellent in smoothness, it can be preferably used as a surface protective film, a process film, and a release film.
  • biaxially oriented polypropylene film of the present invention is used as a coating substrate (substrate film) for an adhesive film.
  • the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer is not particularly limited, and rubber, vinyl polymerization, condensation polymerization, thermosetting resin, silicone, and the like can be used.
  • examples of the rubber-based pressure-sensitive adhesive include butadiene-styrene copolymer system, butadiene-acrylonitrile copolymer system, and isobutylene-isoprene copolymer system.
  • examples of the vinyl polymerization pressure-sensitive adhesive include acrylic, styrene, vinyl acetate-ethylene copolymer system, and vinyl chloride-vinyl acetate copolymer system.
  • examples of the condensation polymerization pressure-sensitive adhesive include polyester.
  • examples of the thermosetting resin-based pressure-sensitive adhesive include epoxy resin-based and urethane resin-based adhesives.
  • acrylic adhesives are preferably used in consideration of excellent transparency, weather resistance, heat resistance, moist heat resistance, substrate adhesion, and the like.
  • acrylic adhesives include “SK Dyne” (registered trademark) 1310, 1435, SK Dyne 1811L, SK Dyne 1888, SK Dyne 2094, SK Dyne 2096, SK Dyne 2137, SK manufactured by Soken Chemical Co., Ltd.
  • Dyne 3096, SK dyne 1852, and the like are preferable examples.
  • a curing agent together with the acrylic pressure-sensitive adhesive.
  • the curing agent include, for example, in the case of isocyanate, toluene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylene diisocyanate, diphenylmethane-4 -4'-diisocyanate, diphenylmethane-2-4'-diisocyanate, 3-methyldiphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4-4'-diisocyanate, dicyclohexylmethane-2-4'-diisocyanate And lysine isocyanate.
  • the mixing ratio of the curing agent is 0.1 to 10 parts by mass, preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the pressure-sensitive adhesive. If the amount is less than 0.1 parts by mass, curing of the pressure-sensitive adhesive layer may be insufficient in the drying furnace, and the film may be trimmed. If it exceeds 10 parts by mass, the excess curing agent may migrate to the substrate or gasify at a high temperature to cause contamination.
  • an antioxidant an ultraviolet absorber, a silane coupling agent, a metal deactivator, and the like may be appropriately added to the acrylic pressure-sensitive adhesive depending on the material of the adherend (glass or functional film).
  • the thickness d of the pressure-sensitive adhesive layer is preferably 1.0 ⁇ m or less. More preferably, it is 0.8 micrometer or less, More preferably, it is 0.6 micrometer or less, More preferably, it is 400 nm or less. If the thickness d of the pressure-sensitive adhesive layer exceeds 1.0 ⁇ m, the slipping property between the back surface of the base film and the surface of the pressure-sensitive adhesive layer may be deteriorated and winding may be difficult. Further, the back of the adhesive layer may occur.
  • Backlining means that after the adhesive layer solution is applied to one side of the base film, it is dried and cured in a drying furnace, and the adhesive film of the present invention is wound into a roll without using a release film. Then, when unwinding an adhesive film at the time of use, the phenomenon which a part of adhesive layer transfers to the back surface of a base film is pointed out.
  • the thickness d of the pressure-sensitive adhesive layer exceeds 1.0 ⁇ m, drying of the pressure-sensitive adhesive layer in the drying furnace becomes insufficient, and there is a case where the film is clogged.
  • a known technique can be used as the method for setting the thickness of the adhesive layer in the above range, and it can be controlled by adjusting the solid content concentration of the solution in the adhesive layer and adjusting the coating thickness in various coating methods. If the thickness of the adhesive layer is too thin, stable coating may be difficult, or the adhesive strength may be too low to adhere to the adherend, so about 0.1 ⁇ m is the lower limit.
  • the adhesive film using the biaxially oriented polypropylene film of the present invention preferably has a 180 ° peeling force of 1 N / 25 mm or less after being bonded to a glass plate.
  • the peeling force is more preferably 0.5 N / 25 mm or less, still more preferably 0.2 N / 25 mm or less, still more preferably 0.05 N / 25 mm or less. If the peeling force exceeds 1 N / 25 mm, slipping between the back surface of the base film and the surface of the adhesive layer may be deteriorated, and winding may be difficult or betrayed.
  • the composition and thickness of the adhesive layer are set within the ranges described below, and the raw material composition and film forming conditions of the film are set within the ranges described below, and the surface roughness of the base film is controlled. It is effective. If the peel force is less than 0.01 N / 25 mm, the adhesive film may be peeled off during transportation after being bonded to the adherend, so the lower limit is about 0.01 N / 25 mm.
  • the coating agent can be used by dissolving additives such as the above-mentioned adhesive and curing agent in a solvent.
  • the solvent can be appropriately adjusted according to the drying temperature in the coater, the viscosity of the coating, and the like.
  • At least one solvent selected from -methoxy-2-propanol, propylene glycol monomethyl ether, cyclohexanone, toluene, ethyl acetate, butyl acetate, isopropyl acetone, methyl ethyl ketone, methyl isobutyl ketone, diacetyl acetone, and acetyl acetone can be used.
  • the solid content concentration in the coating is appropriately selected depending on the viscosity of the coating and the thickness of the adhesive layer, but is preferably 5 to 20% by mass.
  • the above-mentioned base film is conveyed to the coater, and the adhesive layer coating is applied.
  • the surface on which the adhesive layer is applied may be either surface of the base film, but the wettability with the coating agent may be improved in advance by pretreatment such as corona treatment on the coated surface. preferable.
  • the back surface of the base film is preferably not subjected to pretreatment such as corona treatment in order to improve releasability.
  • the coating method (coating method) is not particularly limited, and an existing coating method such as a metabar method, a doctor blade method, a gravure method, a die method, a knife method, a reverse method, or a dip method can be employed.
  • the adhesive layer thickness is a thin film of 1.0 ⁇ m or less, and a gravure method or a reverse method is preferable from the viewpoint of stably obtaining a thin coating layer.
  • the drying temperature is appropriately set depending on the heat resistance of the base film and the boiling point of the solvent, but is preferably 60 to 170 ° C. If the temperature is less than 60 ° C., the adhesive layer may not be sufficiently cured and may be trimmed. When it exceeds 170 degreeC, a base film may deform
  • the drying time is preferably 15 to 60 seconds. If it is less than 15 seconds, curing of the pressure-sensitive adhesive layer may not proceed sufficiently, and the film may be backed up. Exceeding 60 seconds is not preferable because productivity decreases.
  • the adhesive film after drying is wound up with a winder without sticking a release film or the like to the adhesive surface to obtain an adhesive film roll. Since the adhesive film of the present invention has the above-described structure, the adhesive layer is sufficiently cured, and the sliding property between the back surface of the base film and the adhesive layer surface is good. Even if it is taken, there is no problem such as being backed out or wrinkling at the time of winding, and a high-quality adhesive film roll can be obtained.
  • the adhesive film of the present invention obtained as described above can be used in various applications such as packaging film, surface protective film, process film, sanitary product, agricultural product, building product, medical product, etc. Since it is excellent in smoothness, it can be preferably used as a surface protective film and a process film.
  • Thickness of adhesive layer It measured using the "film thickness measuring system” model number F20 of Filmetrics Co., Ltd. The film was sampled in a 10 cm square and arbitrarily measured at 15 points to obtain an average value.
  • VertScan 2.0 R5300GL-Lite-AC Measurement conditions: CCD camera SONY HR-57 1/2 inch objective lens: 5x Intermediate lens: 0.5x Wavelength filter: 530nm white Measurement mode: Wave Measurement software: VS-Measure Version5.5.1 Analysis software: VS-Viewer Version5.5.1 Measurement area: 1.252 mm x 0.939 mm.
  • the projection height of each image was determined by Roughness Analysis of the Off-Line function, and the number of projections having a major axis of 10 ⁇ m or less and a projection height of 50 to 200 nm was counted.
  • the major axis is the distance between two points where the cross-sectional profile curve and the average height line of 0 nm in height cross the cross-sectional profile curve with respect to the above-mentioned protrusions with respect to the protrusion height. Read as.
  • Measuring device NanoScope (R) IIIa AFM (Manufactured by Digital Instruments) Cantilever: Silicon single crystal scanning mode: Tapping mode Scanning range: 50 ⁇ m Scanning speed: 0.7978 Hz Flatten Auto: Order 3.
  • Rollability evaluation Acrylic adhesive (“SK Dyne” (registered trademark), manufactured by Soken Chemical Co., Ltd.) on one side of the film surface (smooth surface) having a low maximum height roughness Sz of the biaxially oriented polypropylene film 1310) was diluted with ethyl acetate, toluene, and methyl ethyl ketone (MEK), and 2.0 parts by mass of a curing agent (manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate D-90) was mixed with 100 parts by mass of the adhesive.
  • the coating agent is applied using a gravure coater, dried in an oven at 80 ° C. for 30 seconds, and the adhesive film having an adhesive layer thickness of 300 nm is wound as it is (without going through a release film), and wound up to 2,000 m. Rolls were evaluated according to the following criteria.
  • A There is no wrinkle or air biting during roll winding, and the appearance is good.
  • B Small wrinkles and air biting are observed during winding, but they are resolved when winding continues.
  • C Wrinkle and air biting occur and winding takes place. Difficult.
  • A It is clean and is equivalent to before applying a load.
  • B Weak unevenness is confirmed.
  • C Strong unevenness is confirmed.
  • Example 1 Crystalline polypropylene (PP (a)) (manufactured by Prime Polymer Co., Ltd., TF850H, MFR: 2.9 g / 10 min, mesopentad fraction: 0.94) 90 parts by mass, 4-methyl-1-pentene polymer (Mitsui Chemicals Co., Ltd., MX004, melting point: 230 ° C.) Feed the raw material from the measuring hopper to the twin screw extruder so that 10 parts by mass are mixed at this ratio, melt knead at 260 ° C., and form a strand It was discharged from the die, cooled and solidified in a 25 ° C. water tank, and cut into chips to obtain a polypropylene raw material (1) for the A layer.
  • PP (a) manufactured by Prime Polymer Co., Ltd., TF850H, MFR: 2.9 g / 10 min, mesopentad fraction: 0.94
  • 4-methyl-1-pentene polymer Mitsubishi Chemicals Co
  • 20 parts by mass of the polypropylene raw material (1) and 80 parts by mass of the crystalline PP (a) as a polypropylene raw material for the surface layer (A) are dry-blended and supplied to a uniaxial melt extruder for the A layer
  • 100 parts by mass of the above crystalline PP (a) is supplied to a single-axis melt extruder for the B layer, melt-extruded at 220 ° C., and a 20 ⁇ m cut sintered filter
  • After removing the foreign matter by using the feed block type A / B / A composite T-die it is laminated at a thickness ratio of 1/22/1, discharged to a casting drum whose surface temperature is controlled at 25 ° C., and cast by an air knife.
  • the air on the non-cooled drum surface of the sheet on the casting drum was cooled by jetting compressed air at a temperature of 30 ° C. and a pressure of 0.3 MPa to obtain an unstretched sheet.
  • the sheet was preheated to 145 ° C. using a ceramic roll, and stretched 4.2 times in the longitudinal direction of the film between rolls provided with a difference in peripheral speed.
  • the temperature of the upstream-side roll was 140 ° C.
  • the temperature of the downstream-side fast roll was 70 ° C.
  • the end part was introduced into a tenter type stretching machine by holding it with a clip, preheated at 170 ° C.
  • Example 2 In Example 1, 40 parts by mass of the polypropylene raw material (1) and 60 parts by mass of the crystalline PP (a) were supplied by dry blending to the single-screw melt extruder for the A layer. 1 to obtain a biaxially oriented polypropylene film having a thickness of 24 ⁇ m. The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 3 In Example 1, 10 parts by mass of the polypropylene raw material (1) and 90 parts by mass of the crystalline PP (a) were supplied by dry blending to a single-screw melt extruder for the A layer. 1 to obtain a biaxially oriented polypropylene film having a thickness of 24 ⁇ m. The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 4 In Example 2, among the rolls provided with the circumferential speed difference of longitudinal stretching, the temperature of the downstream roll was set to 125 ° C., and other than that, a biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained in the same manner as in Example 2. It was. The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 5 In Example 1, the screw rotation speed of the uniaxial melt extruder for the A layer and the uniaxial melt extruder for the B layer was decreased to a final film thickness of 6 ⁇ m, and the casting drum temperature was 20 ° C. Otherwise, a biaxially oriented polypropylene film having a thickness of 6 ⁇ m was obtained in the same manner as in Example 1. The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 6 In Example 1, the temperature of the casting drum was set to 35 ° C., and further, the temperature of the upstream roll was set to 143 ° C. among the rolls provided with the circumferential speed difference of the longitudinal stretching, and the other methods were the same as in Example 1. A biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained. The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 7 In Example 1, 20 parts by mass of the polypropylene raw material (1), 40 parts by mass of the crystalline PP (a), and 40 parts by mass of the self-recovered PP raw material were dry blended as the polypropylene raw material for the surface layer (A). , And supply 100 parts by mass of the crystalline PP (a) as a polypropylene raw material for the core layer (B) to the single-axis melt extruder for the B layer. A biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained in the same manner as in Example 1 except that melt extrusion was performed at 220 ° C. The physical properties and evaluation results of the obtained film are shown in Table 1. At this time, the self-recovered PP raw material indicates a raw material obtained by recycling the loss generated when the film of Example 1 is produced.
  • Example 8 In the rollability evaluation of the film of Example 1, the pressure-sensitive adhesive layer was 1.2 ⁇ m in thickness, and the pressure-sensitive adhesive film was collected as it was (without going through a release film) and wound up to 2,000 m, and the pressure-sensitive adhesive film roll was collected.
  • the physical properties and evaluation results of the obtained film are shown in Table 1. The slipperiness between the back surface of the base film and the surface of the adhesive layer was poor, and wrinkles were generated.
  • Example 1 (Comparative Example 1)
  • the raw material supplied to the uniaxial melt extruder for the A layer was 100 parts by mass of the polypropylene raw material (1), and the rest was a biaxially oriented polypropylene film having a thickness of 24 ⁇ m in the same manner as in Example 1.
  • Got. No protrusions were observed on the film surface, and the rollability evaluation deteriorated.
  • the physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 2 In Example 1, 50 parts by mass of the polypropylene material (1) and 50 parts by mass of the crystalline PP (a) are supplied as raw materials to be supplied to the uniaxial melt extruder for the A layer. Except for the above, a biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained in the same manner as in Example 1. The protrusions on the film surface became a shape in which the protrusions in the MD direction were continuous in a mountain range exceeding 10 ⁇ m, and the windability evaluation deteriorated. The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 3 (Comparative Example 3)
  • the raw material supplied to the uniaxial melt extruder for the A layer was 2 parts by mass of 4-methyl-1-pentene polymer (manufactured by Mitsui Chemicals, Inc., MX004) and the crystalline PP ( a) 98 parts by mass of dry blend was supplied and a biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained in the same manner as in Example 1 except that.
  • the protrusions on the film surface became a shape in which the protrusions in the MD direction were continuous in a mountain range exceeding 10 ⁇ m, and the windability evaluation deteriorated.
  • Table 1 The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 4 (Comparative Example 4)
  • the temperature of the downstream roll was set to 140 ° C., and other than that, a biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained in the same manner as in Example 2. It was.
  • the protrusions on the film surface became a shape in which the protrusions in the MD direction were continuous in a mountain range exceeding 10 ⁇ m, and the windability evaluation deteriorated.
  • the physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 5 (Comparative Example 5)
  • the temperature of the casting drum was set to 45 ° C.
  • the temperature of the roll on the upstream side of the longitudinal stretching was set to 145 ° C.
  • a biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained in the same manner as in Example 1. It was. The film surface was rough and the transfer evaluation deteriorated. The physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 6 a biaxially oriented polypropylene film having a thickness of 24 ⁇ m was obtained in the same manner as in Example 1 except that melt extrusion was performed at 250 ° C. during film formation.
  • the protrusions on the film surface became a shape in which the protrusions in the MD direction were continuous in a mountain range exceeding 10 ⁇ m, and the windability evaluation deteriorated.
  • the physical properties and evaluation results of the obtained film are shown in Table 1.
  • Example 7 (Comparative Example 7)
  • crystalline polypropylene (PP (a)) (manufactured by Prime Polymer Co., Ltd., TF850H, MFR: 2.9 g / 10 min, mesopentad fraction: 0.94) 90 parts by mass, 4-methyl-1 -Feed the raw material from the measuring hopper to the twin screw extruder so that 10 parts by mass of the pentene polymer (Mitsui Chemicals Co., Ltd., MX004, melting point: 230 ° C) is mixed at this ratio, and melt knead at 220 ° C.
  • PP (a) manufactured by Prime Polymer Co., Ltd., TF850H, MFR: 2.9 g / 10 min, mesopentad fraction: 0.94
  • pentene polymer Mitsubishi Chemicals Co., Ltd., MX004, melting point: 230 ° C

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Abstract

L'invention concerne un film de polypropylène à orientation biaxiale qui, lorsque la rugosité maximale d'une de ses faces est représentée par Ｓｚ１, et la rugosité maximale de son autre face est représentée par Ｓｚ２ (Ｓｚ１≦Ｓｚ２), est tel que Ｓｚ１ est compris entre ５０ et ５００ｎｍ, dont un côté long d'au moins une de ses faces est inférieur ou égal à １０μｍ, et qui est tel que des saillies de hauteur comprise entre ５０ et ２００ｎｍ sont présentes à une fréquence de 5 ou plus pour 100μｍ carrés. L'invention fournit un film de polypropylène qui présente d'excellentes propriétés de lissé de surface et de transparence, et qui se révèle également excellent en termes d'aptitude au glissement, à la manipulation et à l'enroulement.
PCT/JP2018/004241 2017-02-07 2018-02-07 Film de polypropylène à orientation biaxiale WO2018147334A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201880007838.XA CN110225937B (zh) 2017-02-07 2018-02-07 双轴取向聚丙烯膜
KR1020197016943A KR102455834B1 (ko) 2017-02-07 2018-02-07 2축 배향 폴리프로필렌 필름
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WO2021171838A1 (fr) * 2020-02-28 2021-09-02 日東電工株式会社 Film comportant une couche adhésive
WO2022138531A1 (fr) 2020-12-23 2022-06-30 東レ株式会社 Film de polypropylène, stratifié, matériau d'emballage et corps d'emballage
WO2023176552A1 (fr) * 2022-03-16 2023-09-21 株式会社ユポ・コーポレーション Feuille et papier pour impression
WO2024202887A1 (fr) * 2023-03-28 2024-10-03 東レ株式会社 Film de polypropylène étiré biaxialement

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JP6753540B1 (ja) * 2018-10-05 2020-09-09 東レ株式会社 ポリオレフィンフィルム、および離型用フィルム
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WO2022138531A1 (fr) 2020-12-23 2022-06-30 東レ株式会社 Film de polypropylène, stratifié, matériau d'emballage et corps d'emballage
WO2023176552A1 (fr) * 2022-03-16 2023-09-21 株式会社ユポ・コーポレーション Feuille et papier pour impression
WO2024202887A1 (fr) * 2023-03-28 2024-10-03 東レ株式会社 Film de polypropylène étiré biaxialement
JP7658513B2 (ja) 2023-03-28 2025-04-08 東レ株式会社 二軸延伸ポリプロピレンフィルム

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JPWO2018147334A1 (ja) 2019-11-21
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