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WO1996005056A1 - Couche d'obturation pour emballage - Google Patents

Couche d'obturation pour emballage Download PDF

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Publication number
WO1996005056A1
WO1996005056A1 PCT/US1995/010112 US9510112W WO9605056A1 WO 1996005056 A1 WO1996005056 A1 WO 1996005056A1 US 9510112 W US9510112 W US 9510112W WO 9605056 A1 WO9605056 A1 WO 9605056A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal layer
ethylene
carbon monoxide
component
thermoplastic
Prior art date
Application number
PCT/US1995/010112
Other languages
English (en)
Inventor
Karlheinz Hausmann
H. Dieter Flieger
Heiko E. Schenck
David R. Sparrow
Original Assignee
E.I. Du Pont De Nemours And Company
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 E.I. Du Pont De Nemours And Company filed Critical E.I. Du Pont De Nemours And Company
Priority to US08/776,697 priority Critical patent/US5912084A/en
Priority to EP95930805A priority patent/EP0775051A4/fr
Priority to JP8507475A priority patent/JPH10505292A/ja
Publication of WO1996005056A1 publication Critical patent/WO1996005056A1/fr

Links

Classifications

    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5855—Peelable seals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L73/00—Compositions of macromolecular compounds obtained by reactions forming a linkage containing oxygen or oxygen and carbon in the main chain, not provided for in groups C08L59/00 - C08L71/00; Compositions of derivatives of such 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
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
    • 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
    • B32B2323/04—Polyethylene
    • 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
    • B32B2331/00—Polyvinylesters
    • B32B2331/04—Polymers of vinyl acetate, e.g. PVA
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C08L2666/14—Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
    • C08L2666/22—Macromolecular compounds not provided for in C08L2666/16 - C08L2666/20

Definitions

  • the present invention relates to a peelable seal layer formed from blends of polar and non-polar polyolefins, such peelable seal layers being useful for adhering adjacent thermoplastic films together to form a package.
  • Such packaging is easy to open by pulling the adjacent films apart due to the relative ease in rupturing the seal layer.
  • the present invention relates to a peelable seal layer formed from a thermoplastic polymer blend comprising (a) a non-polar, non-ionomeric polyolefin and (b) a polar ethylene copolymer having carbon monoxide functionality, and its use to adhere adjacent thermoplastic films together to form a package. Since the bonding strength of the thermoplastic films to one another and to the seal layer is greater than the internal cohesion strength of the peelable seal layer, the peelable seal layer provides for an easy to open package.
  • thermoplastic films sealed by vacuum skin packaging, thermoforming or other processes A wide variety of products, particularly perishable food products are sealed in packages using thermoplastic films sealed by vacuum skin packaging, thermoforming or other processes.
  • vacuum skin packaging a product is placed on a support of a film or of a tray of relatively rigid material and, by differential air pressure, a heated thermoplastic film above the product is molded down upon and around the product and against the support, the space between the upper film and the support having been evacuated.
  • the heated film forms a tight skin around the product and is sealed to the support.
  • the thermoplastic film is sealed to the flange-like edges of the support using heated sealing bars or similar equipment.
  • packaging processes for which the packaging material employs the peelable seal layer of the present invention include packaging in vertical or horizontal form-fill machines, as used in cereal packages and the like.
  • a problem that is encountered in these types of packaging is that the heated thermoplastic film seals so strongly to the support that it is difficult to separate them from each other in order to open the package.
  • An easy to open package of this type should be easily openable by manually pulling apart the two films, normally starting from a point like a corner of the package where the film has purposely not been sealed to the support. In this manner the use of scissors, a knife or other devices to open the package can be avoided.
  • a packaging material described in EP 0 192 131 Bl which addresses this problem consists of an upper and lower web of a thermoplastic material and a seal layer disposed there between and adhered to each of the opposite surfaces of the two webs, the adhesive seal strength of the seal layer to the first and second surfaces being greater than its internal cohesive strength.
  • the upper and lower webs are peeled apart manually, during which time the seal layer separates due to internal cohesive failure, whereby portions of the seal layer are left on the first and second surfaces.
  • the seal layer in these types of packaging materials can be a blend ofan ionomer and a modified ethylene- vinyl acetate copolymer. While these materials work well, they have the disadvantage that ionomers tend to be relatively costly in comparison to other thermoplastics, therefore commercially unattractive for certain end-uses.
  • thermoplastic polymer blend comprising (a) a non-polar polyolefin and (b) a polar ethylene copolymer having carbon monoxide functionality; whereby component (b) is present in the blend in a weight range between 1 and 90 %; and to provide a packaging material comprising the peelable seal layer and a thermoplastic film.
  • Non-polar, non-ionomeric thermoplastic polyolefin means any polyolefin polymer which is thermoplastic but which excludes polar ethylene copolymers and ionomers, as defined herein.
  • Useful polyolefins homopolymers include various polyethylenes, e.g. high density polyethylene (PE-HD), low density polyethylene (PE-LD), very low density polyethylene (PE-VLD), linear low density polyethylene (PE-LLD), as well as polypropylene.
  • Suitable polyolefin copolymers include copolymers of ethylene and a vinyl ester of an alkanoic acid (e.g. vinyl acetate) or an ester of an ethylenically unsaturated carboxylic acid (e.g. methyl acrylate, ethyl acrylate etc.).
  • Component (a) may also be a polypropylene (PP), which, as used herein, includes homopolymers of propylene as well as copolymers of polypropylene which can contain about 1 to about 20 weight percent ethylene or an alpha olefin comonomer of 4 to 16 carbon atoms.
  • the polypropylene can be highly crystalline isotactic or syndiotactic polypropylene.
  • the copolymer can be either a random or block copolymer.
  • the density of the PP or copolymer can be from about 0.88 to about 0.92 g cc; generally, from about 0.89 to about 0.91 g/cc.
  • PE-HD useful as a polyolefin resin of this invention has a density of about 0.941 to about 0.965 g/cc.
  • PE-HD is an established product of commerce and its manufacture and general properties are well known in the art.
  • PE-HD has a relatively broad molecular weight distribution, characterized by the ratio of weight average molecular weight to number average molecular weight of from about 20 to about 40.
  • PE-LD means both low and medium density polyethylene having densities of about 0.910 g/cc to about 0.940 g/cc.
  • the terns include linear polyethylene as well as copolymers of ethylene which are thermoplastic resins, but non-polar.
  • PE-VLD means polyethylene having a density below about 0.910 g/cc and includes linear polyethylene as well as copolymers of ethylene which are thermoplastic resins, but non-polar.
  • PE-LLD is a class of low density polyethylene characterized by little, if any long chain branching, in contrast to conventional PE-LD.
  • the processes for producing PE-LLD are well known in the art and commercial grades of this polyolefin are available.
  • the term PE-LLD means copolymers of ethylene and other alphaolefins such 1-octene, which tend to form clear films that are suitable for packaging applications.
  • Blends of the aforementioned homopolymers and copolymers may also be used in the invention.
  • Preferred component (a)'s according to the invention are PE-LD, PE-LLD and ethylene vinyl acetate (EVA).
  • thermoplastic polyolefins which are not included within the scope of the thermoplastic polyolefins defined for component (a), are well known thermoplastic materials, and may be described as copolymers containing ethylene and an olefinically unsaturated organic acid such as acrylic or methacrylic acid, wherein the acid is neutralized in whole or in part to produce a salt; c.f, for example US. Pat. Nos. 3,264,272, 3,404,134, 3,355,319 and 4,321,337.
  • Component (b) of the thermoplastic blend according to the invention is a polar ethylene copolymer having carbon monoxide functionality.
  • polar ethylene copolymers preferably consist essentially of ethylene, carbon monoxide and, optionally, one or more termonomers which are copolymerizable ethylenically unsaturated organic compounds.
  • Such termonomers are selected from the class consisting of unsaturated mono- and dicarboxylic acids of 3-20 carbon atoms, esters of such unsaturated mono-or dicarboxylic acids, vinyl esters of saturated carboxylic acids wherein the acid group has 1 - 18 carbon atoms, vinyl alkyl ethers wherein the alkyl group has 1-18 carbon atoms, acrylonitrile, methacrylonitrile, copolymerizable unsaturated hydrocarbons such as alpha-olefins of 3-12 carbon atoms, ring compounds such as norbomene and vinyl aromatic compounds.
  • these copolymers consist essentially of, by weight, (1) 30-80% ethylene (preferably 55-75%), (2) 2-30 % carbon monoxide (preferably 5-15%) and (3) 0-60% of one or more termonomers copolymerizable therewith to produce solid copolymers (preferably 20-50%).
  • More preferred copolymers include those in which the termonomer is vinyl acetate or an alkyl (1 -8 carbons) acrylate or alkyl methacrylate (particularly n-butyl acrylate).
  • Preferred component (b)'s according to the invention are ethylene-butylacrylate-carbon monoxide (EnBACO), ethylene-vinyl acetate-carbon monoxide (EVACO) and ethylene-carbon monoxide (ECO).
  • Component (b) will be present in the blend in a weight ratio between 1 and 90%, more preferably 3 to 20%.
  • thermoplastic films which are sealed together using the peelable seal film according to the present invention, may be the previously defined olefinic polymers of component (a), as well as polyesters, polyamides and other thermoplastic polymers.
  • Preferred thermoplastic webs will be made of low density polyethylene (PE-LD).
  • the resistance of the seal layer to peeling from the surface of the thermoplastic film is preferably about 1 - 12 N/15 mm, as measured according to ASTM D882.
  • the thermoplastic polymer blend according to the invention can be made by convention blending techniques. For example, they may be mixed in pellet form and then melt extruded.
  • the thickness of the seal layer is preferably in the range of about 5 to 60 ⁇ m, more preferably 6 to 20 ⁇ m.
  • the thickness of the thermoplastic film to which is adhered the seal layer is preferably in the range of about 10 to 100 ⁇ m, more preferably 20 to 50 ⁇ m.
  • the peelable seal layer may be applied to the thermoplastic film by conventional coextrusion processes to form packaging material.
  • Thermoplastic blends for peelable seal layers according to the present invention are prepared as followed.
  • Multilayer blown film with barrier Three different types of films can be produced: a. Monolayer blown film b. Multilayer blown film for lamination c. Multilayer blown film with barrier
  • Blends of thermoplastic resin pellets indicated in Table 1 are tumble blended and fed into a 30 mm laboratory Brabender Plasticoder extruder (PL 650) with a L/D ratio of 24 and equipped with a laboratory blown film unit Model
  • the processing temperature is set at about 210 °C. Peelable seal layers are extruded having a thickness of from 60-100 mm.
  • the extruded seal layers and the coextruded film for lamination produced on the standard, full scale blown film line are supported on oriented PET lidding film (12 ⁇ m in thickness).
  • the coextruded films with barrier are used directly in a way that the films are sealed against themselves in a fashion such that the peelable seal layer is positioned between the PET film at the indicated temperatures using a heat sealing machine (Kopp PK-110). Under fixed standard conditions (0.4 mPa pressure, 1 sec. dwell time) for each temperature (from 90 °C to 160 °C) the samples are produced.
  • the peel blend is coextruded with polyolefins like PE-LD and PE-HD.
  • the peel blend is produced by dry blending the thermoplastic resin pellet listed below in Tables 1 to 4.
  • the peel blend produced in the same way, is coextruded with PA6 (nylon 6) using a coextrudable adhesive (BYNEL* 3930 available from the DuPont Company).
  • EXAMPLE 90 100 110 120 130 140 150 160
  • EY* ELVALOY* (available from the DuPont Company)
  • the peelable seal layer ideally has a seal strength between 2 and 12 N/15 mm over a wide range of sealing temperatures. As indicated in Table 5 above, the control example demonstrates a steep and unacceptable increase in seal strength at sealing temperatures exceeding 100°C, whereas the examples according to the invention maintain good sealing level over the entire range of sealing temperatures typically encountered. In general (see Table 8), peelable seal layers containing higher levels of component (b) according to the invention will have
  • the peel value obtained is a function of the second phase concentration.
  • the type of ELVALOY* grade used has in general no dominating influence on the peel performance as the peel effect is related to polarity of the polymer generated by the CO-group (Ti ⁇ le 7 . A more significant effect is the

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne une couche d'obturation déchirable, formée à partir de mélanges de polyoléfines polaires et non polaires, utile pour coller des couches thermoplastiques adjacentes et former ainsi un emballage. Celui-ci s'ouvre facilement quand on tire pour séparer ces couches adjacentes car il est relativement simple de déchirer la couche d'emballage.
PCT/US1995/010112 1994-08-10 1995-08-09 Couche d'obturation pour emballage WO1996005056A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US08/776,697 US5912084A (en) 1994-08-10 1995-08-09 Packaging seal layer
EP95930805A EP0775051A4 (fr) 1994-08-10 1995-08-09 Couche d'obturation pour emballage
JP8507475A JPH10505292A (ja) 1994-08-10 1995-08-09 包装用シール層

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP94202300.3 1994-08-10
EP94202300 1994-08-10

Publications (1)

Publication Number Publication Date
WO1996005056A1 true WO1996005056A1 (fr) 1996-02-22

Family

ID=8217097

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/010112 WO1996005056A1 (fr) 1994-08-10 1995-08-09 Couche d'obturation pour emballage

Country Status (3)

Country Link
EP (1) EP0775051A4 (fr)
JP (1) JPH10505292A (fr)
WO (1) WO1996005056A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6133367A (en) * 1997-06-17 2000-10-17 E. I. Du Pont De Nemours And Company Ethylene vinyl acetate blends
WO2000069629A1 (fr) * 1999-05-18 2000-11-23 The Dow Chemical Company Films adhesifs soudables a radiofrequence (rf)
US6361844B1 (en) 1999-01-27 2002-03-26 David T. Ou-Yang Release article and adhesive article comprising the release article
US6465091B1 (en) 2000-03-27 2002-10-15 3M Innovative Properties Company Release article and adhesive article containing a polymeric release material
WO2008006123A1 (fr) * 2006-07-13 2008-01-17 Teich Aktiengesellschaft Matériau composite, procédé de fabrication et utilisation dudit matériau comme matériau d'emballage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879492A (en) * 1971-05-18 1975-04-22 Ucb Sa Heat-sealable film capable of forming peelable seals
US4247584A (en) * 1979-05-22 1981-01-27 American Can Company Composition comprising a blend of EVA polymers having differing VA contents; films and laminates made therefrom by extrusion; and heat-sealed food bags made from the laminates
US4361237A (en) * 1980-06-20 1982-11-30 Ucb Societe Anonyme Heat sealable packaging film producing a peelable seal
EP0192131A2 (fr) * 1985-02-09 1986-08-27 W.R. Grace & Co.-Conn. Emballage facile à ouvrir et son procédé de fabrication
US4678713A (en) * 1984-08-31 1987-07-07 The Dow Chemical Company Co-extruded laminates containing carbon monoxide interpolymers
US5126176A (en) * 1990-02-27 1992-06-30 E. I. Du Pont De Nemours And Company Lidding for containers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE787885A (fr) * 1971-08-30 1973-02-23 Du Pont Interpolymeres d'ethylene en comprimes a tendance reduite au blocage
JPS60159853A (ja) * 1984-01-31 1985-08-21 Rokuou Shoji Kk 遮光性マスキングフイルム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879492A (en) * 1971-05-18 1975-04-22 Ucb Sa Heat-sealable film capable of forming peelable seals
US4247584A (en) * 1979-05-22 1981-01-27 American Can Company Composition comprising a blend of EVA polymers having differing VA contents; films and laminates made therefrom by extrusion; and heat-sealed food bags made from the laminates
US4361237A (en) * 1980-06-20 1982-11-30 Ucb Societe Anonyme Heat sealable packaging film producing a peelable seal
US4678713A (en) * 1984-08-31 1987-07-07 The Dow Chemical Company Co-extruded laminates containing carbon monoxide interpolymers
EP0192131A2 (fr) * 1985-02-09 1986-08-27 W.R. Grace & Co.-Conn. Emballage facile à ouvrir et son procédé de fabrication
US5126176A (en) * 1990-02-27 1992-06-30 E. I. Du Pont De Nemours And Company Lidding for containers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0775051A4 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6133367A (en) * 1997-06-17 2000-10-17 E. I. Du Pont De Nemours And Company Ethylene vinyl acetate blends
US6361844B1 (en) 1999-01-27 2002-03-26 David T. Ou-Yang Release article and adhesive article comprising the release article
WO2000069629A1 (fr) * 1999-05-18 2000-11-23 The Dow Chemical Company Films adhesifs soudables a radiofrequence (rf)
US6558809B1 (en) 1999-05-18 2003-05-06 The Dow Chemical Company Flexible, halogen-free, radio-frequency sealable films
US6465091B1 (en) 2000-03-27 2002-10-15 3M Innovative Properties Company Release article and adhesive article containing a polymeric release material
WO2008006123A1 (fr) * 2006-07-13 2008-01-17 Teich Aktiengesellschaft Matériau composite, procédé de fabrication et utilisation dudit matériau comme matériau d'emballage

Also Published As

Publication number Publication date
JPH10505292A (ja) 1998-05-26
EP0775051A1 (fr) 1997-05-28
EP0775051A4 (fr) 1997-11-19

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