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WO1998036915A1 - Film en matiere plastique, son utilisation dans des procedes de production d'emballages, emballages ainsi produits et utilisation de revetements destines a etre appliques sur de l'encre d'imprimerie - Google Patents

Film en matiere plastique, son utilisation dans des procedes de production d'emballages, emballages ainsi produits et utilisation de revetements destines a etre appliques sur de l'encre d'imprimerie Download PDF

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Publication number
WO1998036915A1
WO1998036915A1 PCT/EP1998/000976 EP9800976W WO9836915A1 WO 1998036915 A1 WO1998036915 A1 WO 1998036915A1 EP 9800976 W EP9800976 W EP 9800976W WO 9836915 A1 WO9836915 A1 WO 9836915A1
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WO
WIPO (PCT)
Prior art keywords
weight
coating
film
plastics film
acrylate
Prior art date
Application number
PCT/EP1998/000976
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English (en)
Inventor
Harald Borgholte
Ursula Heimeier
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 AU67226/98A priority Critical patent/AU6722698A/en
Publication of WO1998036915A1 publication Critical patent/WO1998036915A1/fr

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Classifications

    • 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
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • 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
    • 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
    • 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 for producing packaging containers using these plastics films, to the packaging containers thus produced, and also to a process for producing a multilayer coating, in which an aqueous acrylate-based coating composition is applied to a printing ink.
  • Plastics films which are intended to be used, for example, for packaging 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.
  • the plastics films are provided with adhesive coatings.
  • the adhesive coatings in particul ar cases are either hot -seal able coatings , which can be sealed at el evated temperatures , or col d-seal able coatings , which are sealed at temperatures of from about 0 to about 80°C .
  • Col d-seal able coatings and thei r properties are described, for example, in L. Pl aczek in Coating, 18 (4) , pages 94 - 95 , 1985.
  • Col d-seal able 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. for packaging of 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 prolonged period under normal storage conditions in the form of rolls, show a tendency to stick to the mutually superposed layer of film.
  • plastics films coated with cold-sealable coatings if stored over a prolonged period under normal storage conditions in the form of rolls, show a tendency to stick to the mutually superposed layer of film.
  • an undesirable transfer of printing inks from the outer side to the opposite inner side coated with the sealable coating is also found.
  • 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.
  • the coatings used for this must be printable and are usually called outside coatings.
  • printing inks are then applied to these outside coatings, either directly by the film manufacturer or else by the film user.
  • a protective coating must once again be applied to the printing inks as well (see above), and this is usually called a release coat.
  • these release coats may be applied directly to the generally appropriately pretreated plastics film, without prior application of printing inks, but the outer side opposite to the sealable coating may also remain uncoated.
  • 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* by weight, based on the solids content of wax and of acrylate copolymer, of a wax (added generally in the form of wax dispersion), as described, for example, in DE-A-2440112.
  • 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, however, there is the danger of migration of these constituents into the sealable layer, resulting in an undesirable reduction in seal strength.
  • the object on which the present invention is based is therefore to provide suitable plastics films for producing packaging containers, the films having good resistance to blocking.
  • the plastics films should moreover fulfill the requirements usually placed upon plastics films which are used for producing packaging containers.
  • the plastics films should therefore, for example, be sealable under the conditions usually used and have a good seal strength.
  • the films obtained should have very good optical properties. They should, furthermore, preferably be odorless, so that they are also suitable for producing food packaging containers.
  • the plastics films should also show no transfer of printing inks during storage of the printed films in the form of rolls.
  • the coating composition applied to the side opposite to the sealable coating comprises an aqueous solution or aqueous dispersion of an acrylate copolymer which is obtainable by a two-step emulsion polymerization of
  • novel plastics films can be used for producing packaging containers, in particular for foods, and are distinguished by very good resistance to blocking.
  • the coating applied to the side opposite to the sealable coating layer moreover does not reduce the seal strength unacceptably.
  • the present invention therefore also provides a process for producing packaging containers using these plastics films, and the packaging containers thus produced.
  • coating compositions which comprise, as binders, the fluorine- modified acrylate copolymers referred to are also suitable for producing a protective layer over printing inks applied to other substrates, such as wood.
  • the present invention therefore also provides a process for producing a multilayer coating, in which process a coating composition based on these fluorine-modified acrylate copolymers is applied to a printing ink.
  • composition for the release coat i.e. the outside coating arranged over the printing ink, or the outside coating in the case of unprinted plastics films
  • the composition for the release coat is based on an aqueous acrylic copolymer dispersion or aqueous acrylic copolymer solution, which is prepared by a two-step emulsion polymerization of a) from 1 to 15* by weight, preferably from 2 to 8* by weight, of one or more ⁇ , ⁇ -ethylenically unsaturated carboxylic acids,
  • ⁇ , ⁇ -ethylenically unsaturated carboxylic acids are acrylic acid, methacryl ic acid, maleic acid, crotonic acid, and also mixtures of these. Preference is given to ⁇ . ⁇ -monoethylenically unsaturated monocarboxylic acids. Use of methacryl ic acid and acrylic acid is particularly preferred.
  • alkyl acrylates having from 1 to 12 carbon atoms in the alkyl radical are methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, tert-butyl acrylate, n-pentyl acrylate, isopentyl acrylate, hexyl acrylate, n-octyl acrylate, 2-ethyl hexyl acrylate and decyl acrylate.
  • methyl acrylate is preferred.
  • alkyl methacryl ates are methyl methacrylate, ethyl methacryl ate, propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacryl ate, tert-butyl methacrylate, n-pentyl methacryl ate, isopentyl methacryl ate, hexyl methacryl ate, n-octyl methacrylate, 2-ethyl hexyl methacryl ate, decyl methacrylate and dodecyl methacrylate. Preference is given to the use of methyl methacrylate.
  • Suitable vinyl aromatics are styrene, ⁇ -alkylstyrene and vinyl toluene, in particular styrene.
  • the monomers d) preferably used are fluorine-containing acrylate and/or methacrylate monomers, particularly preferably tetrafluoropropyl methacrylate.
  • Suitable monomers e) are acrylonitrile and methacrylonitrile, and also monomers containing amide groups.
  • the monomers e) are preferably used in an amount of up to 25* by weight, preferably up to 10* by weight, based on the total weight of the monomer mixture.
  • the emulsion polymerization for preparing the aqueous acrylate copolymer dispersion or aqueous acrylate copolymer solution is carried out in aqueous medium in known apparatus, for example in a mixing vessel with heating and cooling equipment.
  • the procedure for adding the monomers may be such that a solution made from all of the water, the eulsifier and the initiator or some of the initiator is initially charged and, if some of the initiator is added during the polymerization, then separately therefrom but in parallel therewith the remainder of the initiator is slowly added at the polymerization temperature. It is moreover also possible initially to charge the water and to heat this to the desired temperature, and then to add the emulsifier and some of the initiator and to homogenize the mixture.
  • the polymerization temperature is usually in the range from 70 to 90°C.
  • the ratio of amounts of monomers and water is advantageously selected in such a way that the resultant acrylate copolymer dispersion has a solids content in the range from 10 to 60* by weight, preferably from 10 to 30* by weight.
  • the emulsifiers used may be anionic and/or non-ionic emulsifiers.
  • anionic emulsifiers are alkali metal salts or ammonium salts of sulfuric onoesters of alkyl phenols or of alcohols, and also the sulfuric monoesters of oxyethylated alkyl phenols or of oxyethylated alcohols, and also phosphoric esters of oxyalkylated alkylphenols.
  • Use is made, for example, of alkali metal salts or of sulfuric monoesters of nonylphenol reacted with 23 mol of ethylene oxide per mole, alkyl- or arylsulfonate, sodium lauryl sulfate, sodium lauryl ethoxylate sulfate, and also the alkali metal salt of diesters of sulfosuccinic acid with alcohols having from 6 to 20 carbon atoms.
  • the nonionic emulsifiers whose use is preferred are ethers of nonylphenols reacted with from 5 to 23 mol of ethylene oxide.
  • phosphoric esters of oxyalkylated alkylphenols in particular phosphoric esters of the reaction product of one mol of nonylphenol with 5 mol of ethylene oxide with an acid number of 125.
  • Suitable initiators for the emulsion polymerization are the usual inorganic peroxodisulfates, preferably potassium peroxodisulfate and ammonium peroxodisul fate, and also ammonium or alkali metal peroxydiphosphates. It is also possible to use redox initiators, for example hydrogen peroxide, benzoyl peroxide, organic peresters, such as perisopivalate, in combination with water-soluble reducing agents, such as ascorbic acid, sulfur compounds, triethylamine, sodium disulfite, hydrazine, hydroxylamine, glycolic acid or tartaric acid.
  • redox initiators for example hydrogen peroxide, benzoyl peroxide, organic peresters, such as perisopivalate, in combination with water-soluble reducing agents, such as ascorbic acid, sulfur compounds, triethylamine, sodium disulfite, hydrazine, hydroxylamine, glycolic acid or tartaric acid.
  • chain-transfer agents examples include mercaptans or polyhalo compounds or branched aromatic hydrocarbons, such as trimethylbenzene.
  • the chain transfer agents are preferably used in all of the steps of the emulsion polymerization.
  • the first step of the emulsion polymerization from 5 to 20* by weight of the monomer mixture of a), b) , c) , d) and, if desired e) is polymerized at a temperature of generally from 70 to 90°C.
  • the remaining 80 to 95* by weight of the monomer mixture is polymerized at a temperature of generally from 70 to 90°C, in the presence of the polymer obtained in the first step of the emulsion polymerization.
  • the aqueous acrylate copolymer dispersion is particularly preferably prepared by emulsion polymerization of methacryl ic acid, methyl acrylate, methyl methacryl ate and tetrafluoropropyl methacryl ate.
  • the resultant acrylate copolymer is neutralized at least to some extent by adding bases, and, if desired, usual auxiliaries and additives are added for producing the aqueous release coat.
  • the base used is ammonia and/or amines, advantageously in the form of an aqueous solution of the neutralizing agent. Ammonia is used in particular.
  • the coating compositions for the release coats according to the invention usually comprise 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.
  • These 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 coatings may, for example, contain insoluble, finely dispersed inorganic materials, such as talc and silica, e.g. the commercial product Syloid 63 FP from Grace.
  • the aqueous coatings composition are used in particular for coating plastics films.
  • plastics films are preferably polyolefin films, for example polyethylene and polypropylene films. These are particularly preferably of polypropylene, in particular 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 composition described above and used according to the invention (release coat) here is usually applied over 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 when 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 manufacturer, or else (as is more common) only the application of the sealable coating takes place at the film manufacturer, and the printing ink (and therefore also the release coat) is applied only later by the user of the plastics film.
  • the film manufacturer initially provides the plastics film with a 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 adjacent film layers from sticking 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 printed plastics films are provided, after application of the printing ink, with the release coat described above and based on the aqueous dispersion or solution of the fluorine- modified acrylate.
  • the aqueous coating compositions referred to are moreover suitable for outside coating of unprinted plastics films, as used, for example, in industry. In this case, the coating is applied directly, with neither prior nor subsequent application of a printing ink, to the plastics film which may have been appropriately pretreated if desired.
  • the surface of the films is generally pretreated before the coating composition for the sealable coating or the aqueous outside coating composition or the printing ink is applied to the plastics films, in order to ensure that the coating is firmly bonded to the film. This is 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 after the pretreatment, in order to secure adhesion of the coating to the substrate film.
  • Suitable precoating agents or primers are known from the literature and encompass, for example, alkyl titanates, and also primers based on epoxides, on me 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 solution.
  • the concentration of the polyethyleneimine in the aqueous or in the organic solution here is, 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 coating composition for the sealable coating, the aqueous coating composition , the printing ink if used and the coating composition for the release coat are 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 flexo printing or reverse-roll coating. The excess of coating composition may be removed in each case by squeegee rollers or doctors.
  • the coating compositions of the sealable coatings are usually applied in an amount which, on drying, gives a smooth, uniformly distributed layer with a weight of from 0.5 to 5 g/m 2 , preferably with a weight of from 0.6 to 1.6 g/m 2 .
  • the aqueous outside coating compositions are usually applied in an amount which, on drying, gives a smooth, uniformly distributed layer with a weight of from 0.5 to 5 g/m 2 , preferably with a weight of from 1 to 2 g/m 2 .
  • the printing inks are usually applied in an amount which, on drying, gives a smooth, uniformly distributed layer with a weight of from 0.5 to 5 g/m 2 , preferably with a weight of from 1 to 2 g/m 2 .
  • the coating compositions for the release coats according to the invention are usually applied in an amount which, on 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 by the release coat on the plastics film like the sealable coating layer and the outside coating layer, if present, is dried separately or together with the sealable coating layer with hot air, radiant heat, or by any other usual means.
  • sealable coatings used for producing the plastics films are known and are described, for example, in DE-A-4341815. Use is made, in particular of aqueous coating compositions for sealable coats based on an acrylate dispersion.
  • the 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 70°C.
  • aqueous outside coating compositions for example those described in DE-A-2440 112 and DE-A-4341815, may be used to coat the plastics films.
  • the printing inks used subsequently to print the plastics films are likewise known.
  • the coating compositions described above and based on the fluorine- modified acrylate copolymer may, however, also be applied over a printing ink for other applications.
  • they may also be applied over a printing ink layer which has been applied to other substrates, e.g. wood.
  • the amount given in Table 1 of water is weighed out in a polymerization vessel made from stainless steel, with sti rrer, reflux condenser, a monomer feed and an initiator feed, and heated to the temperature given in Table 1.
  • the amounts given in Table 1 of monomers and regulator are then weighed out into the monomer tank and homogenized for 20 min. After the initial charge has reached the polymerization temperature, the amount given in Table 1 of e ulsifier/initiator mixture 1 is added to the reactor and stirring is carried out for 10 min. After this, 10* of the monomer mixture is metered into the reactor at a uniform rate over a period of 45 min, and then the temperature of the reaction mixture is maintained for 10 min.
  • the second amount of the emulsifier (emulsifier/water mixture 2) is added, and the remainder of the monomer mixture is then metered into the reactor at a uniform rate over a period of 4 h.
  • the a ine mixture 2 given in Table 1 is weighed out and heated to a temperature of from 60 to 70°C.
  • the amine mixture 1 given in Table 1 is added, and homogenization is carried out for 15 min.
  • the amine mixture 2 is then added uniformly within a period of from 30 to 45 min.
  • the temperature is then held at from 70 to 75°C for one further hour, followed by cooling, and the reaction mixture is discharged through a screen.
  • the resultant dispersion of the acrylate copolymer has the content of non-volatile fractions (1 h/130°C) , the pH value, the coagulated fraction content and the acid number which are given in each case.
  • Table 1 Composition and parameters of acrylate dispersions 1 to 3
  • Initi al charge amount of water added as initial charge and heated to the reaction temperature.
  • Emul . /Init . 1 emulsifier/initiator mixture 1 added as initial charge and consisting of the phosphoric ester of the reaction product of 1 mol of nonylphenol with 5 mol of ethylene oxide with an acid number of 125 (HCA)
  • ammonium peroxodisul fate (APS) MA methyl acrylate
  • IOTG isooctyl thioglycolate
  • MAA methacryl ic acid
  • TFPMA tetraf1 uoropropyl methacryl ate
  • Emul. /Water 2 emulsifier/water mixture 2 added to the reaction mixture and consisting of the phosphoric ester of the reaction product of 1 mol or nonylphenol with 5 mol of ethylene oxide with an acid number of 125 (HCA
  • Amine 1 amine mixture 1 added to the reaction mixture and consisting of ammonia (technical grade, 25* strength), water and a commercially available polysiloxane-based defoamer (Antifoam DC 1510)
  • Amine 2 amine mixture 2 added to the reaction mixture and consisting of ammonia (technical grade, 25* strength) and water
  • Coating compositions 1 to 3 for the release coats are produced using the acrylate copolymer dispersions 1 to 3, by adjusting the solids content of the dispersions to 20*.
  • Helioplastol HG A-2 from BASF Drucksysteme GmbH is firstly applied with a wire-wound draw bar at a wet- film coating thickness of 12 ⁇ m to an oriented polypropylene 33MW247 commercially available from Mobil Plastics, Belgium which has been coated with an outside coating composition, 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.
  • each of the coating compositions 1 to 3 described above is applied with a wi e-wound draw bar at a wet film thickness of 12 ⁇ m, 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 these coated films 1 to 3 with respect to the packaging film coated with a cold-sealable coating is determined by pressing together, for a period of 2 h at 3.5 bar and 50°C, the film coated with the respective release coats 1 to 3 and 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 width 25 mm are then cut from the test surface, and resistance to blocking is then determined by peeling with the aid of an apparatus for measuring tension/elongation. In all three cases, the film has the required resistance to blocking. The effect on seal strength is moreover studied for all of the films coated with the respective release coats 1 to 3, and the seal strength conforms to requirements.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (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 aqueuse à base d'acrylate, laquelle comprend, en tant que liant, une solution ou dispersion aqueuse d'un copolymère d'acrylate, la solution ou dispersion pouvant s'obtenir selon un procédé de polymérisation en deux étapes d'une émulsion contenant: a) 1 à 15 % en poids d'au moins un acide carboxylique α,β-éthyléniquement insaturé, b) 30 à 60 % en poids d'au moins un acrylate d'alkyle possédant 1 à 12 atomes de carbone dans le radical alkyle, c) 20 à 50 % en poids d'au moins un méthacrylate d'alkyle possédant 1 à 12 atomes de carbone dans le radical alkyle, et/ou d'hydrocarbures aromatiques de vinyle, d) 5 à 35 % en poids d'au moins un monomère éthyléniquement insaturé, contenant du fluor et pouvant être copolymérisé avec les autres monomères et e) le cas échéant, jusqu'à 25 % en poids d'autres monomères, tous les pourcentages étant calculés sur le poids total de a), b), c), d) et e).
PCT/EP1998/000976 1997-02-22 1998-02-20 Film en matiere plastique, son utilisation dans des procedes de production d'emballages, emballages ainsi produits et utilisation de revetements destines a etre appliques sur de l'encre d'imprimerie WO1998036915A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU67226/98A AU6722698A (en) 1997-02-22 1998-02-20 Plastics film, its use in processes for producing packaging containers, the pac kaging containers thus produced, and the use of coatings for application over p rinting ink

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19707185A DE19707185A1 (de) 1997-02-22 1997-02-22 Kunststoffolie, ihre Verwendung in Verfahren zur Herstellung von Verpackungsbehältern, die so hergestellten Verpackungsbehälter sowie die Verwendung von Lacken zur Applikation über Druckfarbe
DE19707185.6 1997-02-22

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WO1998036915A1 true WO1998036915A1 (fr) 1998-08-27

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DE (1) DE19707185A1 (fr)
WO (1) WO1998036915A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7571810B2 (en) 2005-09-08 2009-08-11 One Source Industries, Llc Printed packaging
US8177066B2 (en) 2007-02-08 2012-05-15 One Source Industries, Llc Printed packaging

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009876A1 (fr) * 1993-10-04 1995-04-13 Basf Lacke & Farben Aktiengesellschaft POLYMERES A PUISSANCE COHESIVE POUR SOUDAGE à FROID
EP0652249A1 (fr) * 1993-11-10 1995-05-10 Atohaas Holding C.V. Films ou plaques anti-riusselement composés de polymères acryliques et procédé pour leur préparation

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DE19707185A1 (de) 1998-08-27

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