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WO1998036914A1 - Film en matiere plastique, son utilisation dans des procedes de production d'emballage, emballages ainsi produits et utilisation de compositions de revetement aqueuses pour revetir ces films afin de produire ces emballages - Google Patents

Film en matiere plastique, son utilisation dans des procedes de production d'emballage, emballages ainsi produits et utilisation de compositions de revetement aqueuses pour revetir ces films afin de produire ces emballages Download PDF

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Publication number
WO1998036914A1
WO1998036914A1 PCT/EP1998/000975 EP9800975W WO9836914A1 WO 1998036914 A1 WO1998036914 A1 WO 1998036914A1 EP 9800975 W EP9800975 W EP 9800975W WO 9836914 A1 WO9836914 A1 WO 9836914A1
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WO
WIPO (PCT)
Prior art keywords
halogen
weight
mixture
free
component
Prior art date
Application number
PCT/EP1998/000975
Other languages
English (en)
Inventor
Harald Borgholte
Michaela Walter
Jürgen Kaczun
Peter Eric Van Rijn
Original Assignee
Ppg Industries Ohio, Inc.
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 Ppg Industries Ohio, Inc. filed Critical Ppg Industries Ohio, Inc.
Priority to AU64991/98A priority Critical patent/AU6499198A/en
Publication of WO1998036914A1 publication Critical patent/WO1998036914A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F259/00—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F259/00—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00
    • C08F259/08—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00 on to polymers containing fluorine
    • 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
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D151/06—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • 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
    • C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers

Definitions

  • the present invention relates to a plastics film for producing packaging containers, one side of the film being coated with a sealable coating and the opposite side of the film being coated with an aqueous acrylate- based coating composition.
  • the present invention moreover relates to a process to produce packaging containers using these plastics films, to the packaging containers thus produced, and also to the use of the aqueous coating compositions to coat plastics films and for application over printing ink.
  • Plastics films which are intended for use in, for example, the packaging of foods, e.g. chocolate, ice cream, nuts, potato chips and the like, are provided with adhesive coatings in order to allow an effective seal.
  • plastics films of the type mentioned at the outset are also applied to packaging containers made from glass and/or plastic, for example drinks bottles, in order to mark these and/or to provide them with a decorative surface.
  • plastics films are provided with adhesive coatings.
  • the adhesive coatings in particular cases are either hot-seal able coatings, which can be sealed at elevated temperatures, or cold-seal able coatings, which are sealed at temperatures of from about 0 to 80°C.
  • Cold-seal able coatings and their properties are described, for example, ' by L. Placzek, in Coating, 18 (4), pages 94 and 95, 1985.
  • Cold-sealable coatings are preferably applied from an aqueous phase.
  • Pressure- sensitive adhesives, which are used in the cold-sealing process are predominantly used in the packaging of foods, e.g. in packaging for chocolates and ice cream.
  • Sealable coating agents for the sealing of plastics films are known, for example, from US-A-4,898,787, US-A-4,888,395 and US-A-5,070, 164.
  • the cold-sealable coatings are usually based on emulsion polymers which have an average molecular weight of from about 20,000 to 150,000 and a glass transition temperature of from about -15 to about +15°C.
  • cold-sealable coatings have the disadvantage of poor antiblocking properties, i.e. when stored, plastics films coated with cold-sealable coatings, if stored over a relatively long period under normal storage conditions in the form of rolls, show a tendency to stick to the mutually superposed layers of film.
  • plastics films coated with cold-sealable coatings if stored over a relatively long period under normal storage conditions in the form of rolls, show a tendency to stick to the mutually superposed layers of film.
  • Cold-sealable coatings therefore require the application of a protective layer on the other side of the film.
  • coatings may be applied directly to the appropriately pretreated plastics film. These coatings used for this purpose must be printable and are usually called outside coatings. In the case of printed films, printing inks are then applied to these outside coatings, either directly at the film producer or else by the user of the films.
  • a protective coating usually called a release coat, must also be applied to the printing inks.
  • the release coats may be applied without prior application of printing inks directly to the plastics film, which is generally appropriately pretreated.
  • the coating compositions for the printable outside coatings usually used either contain solvent or are aqueous and based on acrylate copolymers.
  • the antiblocking properties are usually obtained by adding from 1 to 10 percent by weight, based on the solids content of wax and of acrylate copolymer, of a wax (added generally as wax dispersion), as described, for example, in DE-A-2440 112.
  • the release coats described above usually contain polyamide resins, often in combination with cellulose nitrate and with waxes, with fatty amides or with silicone oils. If low-molecular-weight silicone oils or waxes are used in the release coats, there is the danger of migration of these constituents into the sealable layer, resulting in an undesirable reduction in seal strength.
  • This article does not contain further details on the composition of the release coats.
  • the object on which the present invention is based is therefore to provide plastics films which are suitable for producing packaging containers and have good resistance to blocking.
  • the plastics films should moreover fulfill the requirements usually placed upon plastics films which are used to produce packaging containers.
  • the plastics films should therefore, for example, be sealable under the conditions usually used and have a good seal strength.
  • the coating materials/coatings used to produce the films should permit very easy sol ent recovery.
  • the resultant films should moreover have very good optical properties. They should, furthermore, preferably be odorless, so as to be suitable also for producing food packaging containers.
  • the plastics films should also show no transfer of printing inks when the printed films are stored in the form of rolls.
  • the coating composition applied to the side opposite to the sealable coating layer comprises, as binder, an aqueous solution or dispersion of an acrylate copolymer, the solution or dispersion being obtainable by free-radical polymerization of
  • component (al) from 1 to 50# by weight, based on the total weight of component (A), of acrylic acid or methacrylic acid or of a mixture of acrylic acid and methacrylic acid and (a2) from 50 to 99# by weight, based on the total weight of component ' (A), of an ethylenically unsaturated monomer different from (al) or of a mixture of such ethylenically unsaturated monomers, in the presence of
  • the plastics films according to the invention can be used to produce packaging containers, in particular for foods, and are distinguished by very good resistance to blocking.
  • the present invention therefore provides, in addition, a process to produce packaging containers using these plastics films, the packaging containers thus produced, and also the use of the aqueous coating compositions to coat plastics films and for application over printing ink.
  • the mixture (A) used to prepare the acrylate dispersion used according to the invention comprises
  • component (al) from ⁇ to 50# by weight, based on the total weight of component (A), of acrylic acid or methacrylic acid or of a mixture of acrylic acid and methacrylic acid and
  • component (a2) from 50 to 99# by weight, based on the total weight of component (A), of an ethylenically unsaturated monomer different from (al) or of a mixture of such ethylenically unsaturated monomers.
  • composition of the mixture of (al) and (a2) is preferably selected in such a way that if the mixture of (al) and (a2) is polymerized alone the resultant polymer has a glass transition temperature of from 0 to 150°C, preferably from 10 to 80°C.
  • composition of the mixture of (al) and (a2) is preferably selected in such a way that if the mixture of (al) and (a2) is polymerized alone the resultant polymer contains from 0.04 to 1.0 milliequivalents, preferably from 0.1 to 0.5 milliequivalents, of one or more of the following functional groups: -C00H, -OH, -NR 3 , -CN, -C0NH 2 , -CO-, -NHC0NH-, -0C0NH-, -0P0 3 H 2 , -0S0 3 H, -R-O-R- (where R is an organic radical, preferably an alkyl or alkylene radical having from 1 to 6 carbon atoms) .
  • glass transition temperatures of polymers prepared from ethylenically unsaturated monomers may be calculated from the equation
  • Tgn glass transition temperature of the homopolymer made from the nth monomer
  • examples of compounds which may be used as component (a2) are: acrylates or methacrylates, in particular aliphatic acryl ates or methacrylates having up to 20 carbon atoms in the alcohol radical, such as methyl, ethyl, propyl , butyl , hexyl , ethyl hexyl , stearyl and 1 auryl acryl ate or the corresponding methacrylates, the corresponding esters of other ethylenically unsaturated acids having up to 6 carbon atoms in the molecule, such as ethacrylic acid and crotonic acid, acrylamidomethylpropanesulfonic acid, vinyl aromatic hydrocarbons, such as styrene, ⁇ -alkylstyrene and vinyltoluene, monomers containing amide groups, such as acrylamide, methacryl amide, N-methylolacryl amide and N-methylolmethacryl amide
  • component (B) use is made of a halogen-containing polyolefin or of a' halogen-containing copolymer, or of a mixture of halogen-containing polyolefins and/or halogen-containing copolymers, or of a mixture of halogen-containing polyolefins and/or halogen-containing copolymers and halogen-free polyolefins and/or halogen-free copolymers.
  • Component (B) used may also be a mixture of
  • component (b2) from 10 to 100# by weight, based on the total weight of component (B), of a halogen-containing polyolefin and/or of a halogen-containing copolymer or of a mixture of more than one halogen-containing polyolefin and/or halogen-containing copolymer.
  • the polyolefins and copolymers used according to the invention as component (B) preferably have an iodine number of up to 0.3 mg I 2 /g, preferably from 0.005 to 0.05 mg I 2 /g.
  • component (bl) of a homopolymer of propylene or of a copolymer of propylene and of at least one comonomer, such as ethylene, butylene or isoprene, or of a mixture of such polyolefins and/or copolymers.
  • Component (bl) used may also be a halogen-free copolymer of
  • component (bbl) from 1 to 99* by weight, preferably from 50 to 90* by weight, based on the total weight of component (bl), of propylene,
  • component (bb2) from 0 to 99* by weight, preferably from 10 to 50* by weight, based on the total weight of component (bl), of at least one olefin, other than isoprene, which is copolymerizable with (bbl) and contains from 5 to 20 carbon atoms per molecule, preferably from 6 to 8 carbon atoms per molecule, and
  • component (bb3) from 0 to 50* by weight, preferably from 0 to 25* by weight, based on the total weight of component (bl), of ethylene and/or butylene
  • component (bb2) use is made of at least one olefin, other than isoprene, which is copolymerizable with (bbl) and contains from 5 to 20 carbon atoms per molecule, preferably from 6 to 8 carbon atoms per molecule.
  • the olefin used as component (bb2) may be unbranched, branched, acyclic or cyclic. Examples of acyclic olefins are pentene, hexene, heptene, octene, nonene and decene.
  • cyclic olefins are cyclopentene, cyclohexene, cycloheptene, cyclooctene, cyclononene, cyclodecene and norbornene.
  • Olefins preferably used as component (bb2) are branched or unbranched acyclic olefins which contain, per molecule, from five to twenty carbon atoms, preferably from six to eight carbon atoms, and only one olefinically unsaturated double bond, preferably in ' the ⁇ position.
  • Examples of such olefins are 1-pentene, 1- hexene, 1-heptene, 1-octene, 1-nonene and 1-decene.
  • Particularly preferred components (bb2) are 1-hexene, 1- heptene and 1-octene.
  • the water-dilutable binders used according to the invention are prepared by free-radical polymerization of from 20 to 90* by weight, preferably from 54 to 85* by weight, of mixture (A) in the presence of from 9.9 to 79.9* by weight, preferably from 14 to 45* by weight, of component (B) and from 0.1 to 10* by weight, preferably from 1 to 7* by weight, of component (C), and, after neutralizing at least 20* of the carboxyl groups present in the resultant polymerization product, dispersing the polymerization product in water.
  • the percentages for components (A), (B) and (C) are based on the total weight of (A), (B) and (C) .
  • the polymerization of mixture (A) in the presence of components (B) and (C) may be carried out in bulk, in aqueous emulsion or in an organic solvent, or in a mixture of organic solvents.
  • the polymerization is preferably carried out in an organic solvent or in a mixture of organic solvents, in particular in apolar solvents having a boiling point in the range of from 120 to 200°C, preferably from 135 to 190°C, at polymerization temperatures of from 120 to 200°C, preferably from 130 to 160°C.
  • any known free-radical generator may be used as component (C). Preference is given to the use of free-radical generators based on per-compounds. In addition, preference is given to the use of free- radical generators which have a half-life time at the polymerization temperature of from 15 to 180 minutes.
  • dialkyl peroxides such as dicumyl peroxide and di -tert-butyl peroxide
  • peroxyesters such as tert-butyl peroxybenzoate, tert-butyl peroxyoctanoate, tert-butyl peroxyacetate and tert-butyl peroxyisobutyrate
  • diacyl peroxides such as benzoyl peroxide and acetyl peroxide.
  • di-tert-butyl peroxide, tert-butyl perethyl hexanoate and tert-butyl peracetate as component (C) .
  • organic amines in particular of tertiary amines, such as dimethylethanol amine.
  • the coating compositions for the release coats according to the invention usually contain from 80 to 100* by weight of the acrylate copolymer solution or acrylate copolymer dispersion described above, based on the total weight of the coating composition.
  • the solids content of the acrylate dispersions or solutions is generally from 10 to 30*.
  • the coating compositions for the release coats may moreover usually also contain from 0 to 20* by weight, based on the total weight of the coating composition, of usual auxiliaries and additives.
  • auxiliaries and additives are flow control agents, stabilizers, thickeners, defoamers, pigments, fillers and the like.
  • the coating compositions may, for example, contain insoluble, finely dispersed inorganic substances, such as talc or silica, e.g. the commercial product Syloid 63 FP from Grace, and the like.
  • the aqueous coating compositions are used in particular for coating plastics films.
  • plastics films are preferably polyolefin films, for example polyethylene films and polypropylene films. These are particularly preferably of polypropylene, in particular of oriented polypropylene.
  • one outer side of the plastics film is coated with a sealable coating and the opposite outer side of the plastics film is coated with the coating described above.
  • release coat The coating described above and used according to the invention (release coat) here is usually applied to a printing ink layer.
  • the release coat used according to the invention prevents the mutually superposed film layers from adhering to one another during use and if the plastics films are stored in the form of rolls for a relatively long period under normal storage conditions. It also serves to prevent migration of the printing ink.
  • the plastics films under consideration may either be provided with a printing ink directly at the film producer, or else (as is more common) only the initial application of the sealable coating takes place at the film producer, and the printing ink (and therefore also the release coat) is applied only later by the user of the plastics film.
  • the film producer initially provides the plastics film with the sealable coating and with an outside coating prepared from an aqueous coating composition which, like the coating described above and used according to the invention (release coat), serves to prevent superposed film layers from adhering to one another during the storage and transport of the films on rolls.
  • release coat prepared from an aqueous coating composition which, like the coating described above and used according to the invention
  • the user of the film then applies firstly the printing ink and then the release coat.
  • the printed plastics films are provided, ' after application of the printing ink, with the release coat described above and based on the dispersion/solution of the fluorine-modified acrylate.
  • aqueous coating compositions referred to are moreover also suitable for the outer coating of unprinted plastics films, as used in industry, for example.
  • the coating is applied directly, without prior or subsequent application of a printing ink, to the plastics film which may have been appropriately pretreated if desired.
  • the surface of the plastics films is usually pretreated, before applying the sealable coating or the aqueous coating composition for the outside coating, or the printing ink to the films, in order to ensure that the coating adheres firmly to the film. This is intended to prevent the coating from becoming peeled off or pulled off from the film.
  • This treatment is carried out by known methods, e.g. by chlorination of the plastics film, treatment with oxidants, such as chromic acid or hot air, or by steam treatment or flame treatment.
  • oxidants such as chromic acid or hot air
  • steam treatment or flame treatment is a particularly preferred pretreatment used.
  • a particularly preferred pretreatment used is high-voltage corona discharge.
  • the plastics films are generally precoated, in order to ensure adhesion of the coating to the substrate film.
  • Suitable precoating agents or primers are known from the literature and encompass, for example, alky! titanates, and also primers based on epoxides, on mel amine- formaldehyde resins and on polyethyleneimines. The latter are particularly suitable for precoating plastics films.
  • These polyethyleneimines may be applied to the, if desired pretreated, plastics films either from organic or else from aqueous solutions.
  • the concentration of the polyethyleneimine in the aqueous or in the organic solution here can be, for example, 0.5* by weight.
  • Suitable polyethyleneimine primers are described, for example, in DE-A-2440 112 and US-A-3,753,769.
  • the uncoated plastics films generally have a thickness of from 0.015 to 0.060 mm.
  • the aqueous coating composition for the release coat is applied to the plastics film in a usual manner, for example by gravure coating, roller coating, dipping, spraying, or with the aid of gravure or flexoprinting or reverse-roll coating. The excess of aqueous solution may be removed by squeegee rollers or doctors.
  • the coating composition for release coat is usually applied in an amount such that drying gives a smooth, uniformly distributed layer with a weight of from 1 to 5 g/m 2 , preferably with a weight of from 2 to 3 g/m 2 .
  • the coating formed on the plastics film by the aqueous coating composition like the sealable coating layer, is dried separately or together with the sealable coating layer with hot air, radiant heat or by any other usual means.
  • sealable coatings used to produce the plastics films are likewise known and are described, for example, in DE-A-4341815.
  • sealable coatings are preferably sealed at a temperature of from 0 to 80°C, particularly preferably at least 30°C and very particularly preferably from 40 to
  • the printing inks used to print the plastics films are likewise known.
  • aqueous solution or dispersion, described above, of the acrylate copolymer is moreover also suitable as a binder in coating composition which are applied over a printing ink in processes to produce a multilayer coating on other substrates, e.g. wood.
  • This solution is then mixed with 59.5 parts of dimethylethanol amine within a period of 30 in, and then stirred for 15 min. 1000 parts of deionized water are then added, with stirring, at 80°C. The organic solvents are finally distilled off from the resultant aqueous dispersion until a residual solvent content of less than 5* by weight has been achieved, adding a further 2998.0 parts of deionized water.
  • the resultant aqueous dispersion has a content of nonvolatile fractions (1 h/130°C) of 21.5*, an acid number of 29.9 mg KOH/g and a pH value of 9.0.
  • Table 1 Monomer composition in parts and monomer composition in * by weight, based on the total weight of the monomers.
  • the coating composition for the release coat is prepared by diluting the acrylate dispersions with water to a solids content of 20*.
  • a commercially available flexo-printing ink (commercial product Helioplastol HG A- from BASF Drucksyste e GmbH) is firstly applied with a wire-wound draw bar at a wet- film coating thickness of 6 micrometers to a commercially available oriented polypropylene 33MW247 from Mobil Plastics, Belgium which has been coated with an outside coating, and the ink is dried for 30 s at room temperature and then for 30 s at an air temperature of 60°C in a Helios laboratory heating cabinet.
  • the coating composition for the release coat described above is applied with a wire-wound draw bar at a wet-film thickness of 12 micrometers, and dried for 30 s at room temperature and then for 30 s at an air temperature of 60°C in a Helios laboratory heating cabinet.
  • the resistance to blocking of this coated film with respect to the packaging film coated with a cold-sealable coating according to DE-A-4341815 is determined by pressing together, for a period of 2 hours at 3.5 bar and 50°C, the film coated with the release coat and an OPP film made from oriented polypropylene 33MW247 from Mobil Plastics, Belgium, which has been coated with a cold-sealable coating according to DE-A-4341815.
  • Test strips of widths of 25 mm are then cut from the test surface, and the resistance to blocking is then determined by peeling with the aid of an apparatus for measuring tension/elongation.
  • the coated film shows adequate resistance to blocking.
  • the seal strength is moreover not influenced unfavorably by the release coat.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un film en matière plastique, servant à la production d'emballages et dont un côté extérieur est revêtu d'un revêtement de scellage, le côté extérieur opposé étant revêtu d'une composition de revêtement extérieure contenant une dispersion aqueuse d'acrylate obtenue selon un procédé consistant à faire polymériser (A) 20 à 90 % en poids d'un mélange comprenant (a1) 1 à 50 % en poids, calculés sur le poids total du constituant (A), d'acide (méth)acrylique et (a2) 50 à 90 % en poids, calculés sur le poids total du constituant (A), d'au moins un autre monomère, cette polymérisation s'effectuant en présence de (B) 9,9 à 99 % en poids d'au moins une polyoléfine dépourvue d'halogène et (C) 0,1 à 10 % en poids d'au moins un amorceur radicalaire, puis à disperser dans l'eau le produit de polymérisation ainsi obtenu, les pourcentages pondéraux des constituants (A), (B) et (C) étant calculés sur le poids total de (A), (B) et (C).
PCT/EP1998/000975 1997-02-22 1998-02-20 Film en matiere plastique, son utilisation dans des procedes de production d'emballage, emballages ainsi produits et utilisation de compositions de revetement aqueuses pour revetir ces films afin de produire ces emballages WO1998036914A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64991/98A AU6499198A (en) 1997-02-22 1998-02-20 Plastics film, its use in processes to produce packaging containers, the pac kaging containers thus produced, and the use of aqueous coating compositions to coatplastics films for producing packaging containers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19707137A DE19707137A1 (de) 1997-02-22 1997-02-22 Kunststoffolie, ihre Verwendung in Verfahren zur Herstellung von Verpackungsbehältern, die so hergestellten Verpackungsbehälter sowie die Verwendung von wäßrigen Lacken zur Beschichtung von Kunststoffolien für die Herstellung von Verpackungsbehältern
DE19707137.6 1997-02-22

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WO1998036914A1 true WO1998036914A1 (fr) 1998-08-27

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DE20118862U1 (de) 2001-11-19 2002-02-21 ALLOD GmbH & Co. KG, 91587 Adelshofen Kunststoffcompound für die Beschichtung von Oberflächen von aus synthetischen Werkstoffen hergestellten Erzeugnissen

Citations (2)

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EP0588682A1 (fr) * 1992-09-15 1994-03-23 Elf Atochem S.A. Résines thermoplastiques résultant du greffage de polyoléfines chlorées par des monomères insatures et procédé d'obtention
WO1995028453A1 (fr) * 1994-04-13 1995-10-26 Basf Lacke + Farben Ag Liants diluables dans l'eau, peintures aqueuses les contenant, et procede d'application d'une couche de fond ou d'une seule couche de peinture sur des matieres plastiques

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US4749616A (en) * 1986-06-20 1988-06-07 Mobil Oil Corporation Heat sealable aqueous latex coating composition for polymer film
ATE173748T1 (de) * 1993-06-03 1998-12-15 Grace W R & Co Grenzmischung- und nahrungsmittelverpackungsfilm der diese mischung enthält

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588682A1 (fr) * 1992-09-15 1994-03-23 Elf Atochem S.A. Résines thermoplastiques résultant du greffage de polyoléfines chlorées par des monomères insatures et procédé d'obtention
WO1995028453A1 (fr) * 1994-04-13 1995-10-26 Basf Lacke + Farben Ag Liants diluables dans l'eau, peintures aqueuses les contenant, et procede d'application d'une couche de fond ou d'une seule couche de peinture sur des matieres plastiques

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DE19707137A1 (de) 1998-08-27

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