DE102005012813B4 - Use of a composition comprising a crosslinkable polymer as a laminating adhesive - Google Patents

Abstract

Use of an aqueous composition comprising A) a polymer obtainable by free radical polymerization which contains 1 to 200 millimoles (mmol) of epoxy groups (calculated with a molecular weight of 42 g / mol) per 1 kg of polymer B) an amino compound having a total of at least 2 Nitrogen atom bound H atoms as Kaschierklebstoff, characterized in that the polymer is composed of at least 80 wt .-% of C1 to C20 alkyl (meth) acrylates.

Description

• A) ein durch radikalische Polymerisation erhältliches Polymer, welches 1 bis 200 Millimol (mmol) Epoxygruppen (berechnet mit einem Molgewicht von 42 g/Mol) pro 1 kg Polymer enthält
• B) eine Aminoverbindung mit insgesamt mindestens 2 an ein Stickstoffatom gebundenen H-Atomen

als Kaschierklebstoff, wobei das Polymer zu mindestens 80 Gew.-% aus C1 bis C20 Alkyl(meth)acrylaten aufgebaut ist.The invention relates to the use of an aqueous composition containing

• A) a polymer obtainable by radical polymerization, which contains 1 to 200 millimoles (mmol) of epoxy groups (calculated with a molecular weight of 42 g / mol) per 1 kg of polymer
• B) an amino compound having a total of at least 2 bonded to a nitrogen atom H atoms

as a laminating adhesive, wherein the polymer is composed of at least 80 wt .-% of C1 to C20 alkyl (meth) acrylates.

Copolymers which are used in adhesives are in many cases crosslinkable copolymers. By networking z. B. adhesive coatings with good elastic properties, high cohesion, d. H. internal strength, high chemical and solvent resistance can be obtained.

For crosslinking, a crosslinking agent which reacts with functional groups in the copolymer is generally added to the copolymers.

Possible crosslinking agents are z. As polyisocyanates which react with hydroxyl or amino groups.

A disadvantage of these aqueous preparations, however, is the lack of storage stability. The polyisocyanate must therefore be dispersed in water shortly before its use as a crosslinking aid and mixed with the copolymer.

An increased storage stability can be achieved by reacting the isocyanate groups with blocking agents, for. As oximes, caprolactam, phenols, Maleinsäuredialkylestern be achieved. The resulting so-called blocked polyisocyanates hydrolyze in aqueous dispersion only to a minor extent.

However, crosslinking reactions only occur after cleavage of the blocking agent at temperatures from about 130 ° C.

Previously known aqueous adhesive formulations with polyisocyanates as crosslinking aids are therefore either not storage-stable and can therefore only be used as a 2-component system or crosslinked only at high temperatures.

Storage-stable, at room temperature after removal of the solvent crosslinking aqueous dispersions are z. B. from the EP-A 3516 . WO 93/25588 or EP-A 516074 known. These dispersions contain polyhydrazides or aminooxy crosslinkers, which react with monomers copolymerized in the copolymer with carbonyl groups. From the DE 3820154 A1 aqueous dispersions of copolymers are known which contain epoxide groups and are obtainable by copolymerization of vinyl esters, unsaturated epoxide compounds and optionally other monomers. The dispersions are used for the production of paints, plasters and cement mortars. From the DE 19733104 A1 are crosslinkable, water-redispersible powder compositions containing, inter alia, polymers of radically polymerizable ethylenically unsaturated monomers, wherein a certain part of the monomers are those having a substituent which may be selected from, inter alia, epoxy groups. The compositions also contain compounds containing at least two salified groups, among others selected from amines. The compositions are used inter alia in construction chemicals or in coating compositions and adhesives.

In principle, there is a need for further room-temperature crosslinking dispersions in order to be able to provide alternatives to polyhydrazide crosslinking. Furthermore, these dispersions should have good performance properties.

Object of the present invention were therefore storage-stable, crosslinkable compositions which have good performance properties and are particularly suitable as laminating adhesive.

Accordingly, the above-defined composition and its use has been found.

The composition to be used according to the invention contains a polymer obtainable by free-radical polymerization, in particular by emulsion polymerization. The polymer is at least 80% by weight of so-called major monomers.

The main monomers are selected from C ₁ -C ₂₀ alkyl (meth) acrylates. Optional monomers are selected from vinyl esters of carboxylic acids containing up to 20 carbon atoms, vinylaromatics having up to 20 carbon atoms, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of alcohols containing 1 to 10 carbon atoms, aliphatic hydrocarbons having 2 to 8 carbon atoms. Atoms and 1 or 2 double bonds or mixtures of these monomers.

To name a few are z. B. (meth) acrylic acid alkyl ester having a C ₁ -C ₁₀ alkyl radical, such as methyl methacrylate, methyl acrylate, n-butyl acrylate, ethyl acrylate and 2-ethylhexyl acrylate.

In particular, mixtures of (meth) acrylic acid alkyl esters are also suitable.

Vinyl esters of carboxylic acids having 1 to 20 carbon atoms are, for. As vinyl laurate, stearate, vinyl propionate, vinyl versatate and vinyl acetate.

Suitable vinylaromatic compounds are vinyltoluene a- and p-methylstyrene, a-butylstyrene, 4-n-butylstyrene, 4-n-decylstyrene and preferably styrene. Examples of nitriles are acrylonitrile and methacrylonitrile.

The vinyl halides are chloro, fluoro or bromo substituted ethylenically unsaturated compounds, preferably vinyl chloride and vinylidene chloride.

To name as vinyl ethers are, for. As vinyl methyl ether or vinyl isobutyl ether. Vinyl ether is preferably from 1 to 4 C-containing alcohols.

As hydrocarbons having 2 to 3 carbon atoms and two olefinic double bonds may be mentioned butadiene, isoprene and chloroprene.

Preferred main monomers are the C ₁ to C ₁₀ alkyl acrylates and methacrylates, in particular C ₁ to C ₈ alkyl acrylates and methacrylates, the acrylates in each case being particularly preferred.

Very particular preference is given to methyl acrylate, ethyl acrylate, n-butyl acrylate, n-hexyl acrylate, octyl acrylate and 2-ethylhexyl acrylate, and mixtures of these monomers.

The polymer contains 1 to 200 millimoles (mmol) of epoxy groups (calculated with a molecular weight of 42 g / mol per 1 kg of polymer.

The content of epoxy groups is preferably 1 to 150 millimoles, more preferably 5 to 50 millimoles per 1 kg of polymer.

The epoxy groups may, for. B. by polymer-analogous reaction of the polymer with suitable compounds subsequently bonded to the polymer.

Preferably, monomers containing epoxy groups are included in the polymerization. The amount of these monomers is chosen so that the polymer after polymerization has the above content of epoxy groups.

Particularly preferably, the monomers containing epoxy groups are glycidyl acrylate or glycidyl methacrylate.

In addition to the main monomers and optionally monomers containing epoxy groups, the polymer may contain other monomers, for. B. monomers with acid groups, eg. As carboxylic acid, sulfonic acid or phosphoric acid groups. Preferred are carboxylic acid groups. Called z. For example, acrylic acid, methacrylic acid, itaconic acid, maleic acid or fumaric acid.

Preference is given to using monomers having acid groups, in particular carboxylic acids. Their content is in particular 0.05 to 5, particularly preferably 0.1 to 3 wt .-%, based on the polymer.

Other monomers are z. As well as hydroxyl-containing monomers, in particular C ₁ -C ₁₀ -hydroxyalkyl (meth) acrylates, (meth) acrylamide.

Phenyloxyethylglycol mono- (meth) acrylate, amino (meth) acrylates such as 2-aminoethyl (meth) acrylate may also be mentioned as further monomers.

The glass transition temperature of the polymer is preferably below 60 ° C, in particular it is -50 to + 60 ° C, more preferably -30 to + 40 ° C and most preferably -30 to + 20 ° C.

The glass transition temperature of the polymer can be determined by conventional methods such as differential thermal analysis or differential scanning calorimetry (see, for example, ASTM 3418/82, so-called "midpoint temperature").

The preparation of the polymer is preferably carried out by emulsion polymerization, it is therefore an emulsion polymer.

In the emulsion polymerization, ionic and / or nonionic emulsifiers and / or protective colloids or stabilizers are used as surface-active compounds.

A detailed description of suitable protective colloids can be found in Houben-Weyl, Methods of Organic Chemistry, Volume XIV / 1, Macromolecular substances, Georg-Thieme-Verlag, Stuttgart, 1961, pp. 411 to 420. Suitable emulsifiers are both anionic, cationic and nonionic emulsifiers into consideration. Preferably used as accompanying surface-active substances are exclusively emulsifiers whose molecular weight, in contrast to the protective colloids, is usually below 2000 g / mol. Preferably, anionic and nonionic emulsifiers are used as surface-active substances. Common accompanying emulsifiers are z. B. ethoxylated fatty alcohols (EO degree: 3 to 50, alkyl radical: C ₄ - to C ₉ ), alkali metal salts of dialkyl esters of sulfosuccinic acid and alkali metal and ammonium salts of alkyl sulfates (alkyl: C ₈ - to C ₁₂ ), of ethoxylated alkanols ( EO degree: 4 to 30, alkyl radical: C ₁₂ to C ₁₈ ), of ethoxylated alkylphenols (EO degree: 3 to 50, alkyl radical: C ₄ to C ₉ ), of alkylsulfonic acids (alkyl radical: C ₁₂ to C ₁₈ ), and of alkylarylsulfonic acids (alkyl group: C ₉ - to C ₁₈ ).

worin R⁵ und R⁶ Wasserstoff oder C₄- bis C₁₄-Alkyl bedeuten und nicht gleichzeitig Wasserstoff sind, und C und Y Alkalimetallionen und/oder Ammoniumionen sein können. Vorzugsweise bedeuten R⁵, R⁶ lineare oder verzweigte Alkylreste mit 6 bis 18 C-Atomen oder Wasserstoff und insbesondere mit 6, 12 und 16 C-Atomen, wobei R⁵ und R⁶ nicht beide gleichzeitig Wasserstoff sind. X und Y sind bevorzugt Natrium, Kalium oder Ammoniumionen, wobei Natrium besonders bevorzugt ist. Besonders vorteilhaft sind Verbindungen II in denen X und Y Natrium, R⁵ ein verzweigter Alkylrest mit 12 C-Atomen und R⁶ Wasserstoff oder R⁵ ist. Häufig werden technische Gemische verwendet, die einen Anteil von 50 bis 90 Gew.-% des monoalkylierten Produktes aufweisen, beispielsweise Dowfas^®2A1 (Warenzeichen der Dow Chemical Company).Further suitable emulsifiers are compounds of the general formula II

wherein R ⁵ and R ^{6 are} hydrogen or C ₄ - to C ₁₄ -alkyl and are not simultaneously hydrogen, and C and Y may be alkali metal ions and / or ammonium ions. Preferably R ⁵ , R ^{6 are} linear or branched alkyl radicals having 6 to 18 C atoms or hydrogen and in particular having 6, 12 and 16 C atoms, wherein R ⁵ and R ^{6 are} not both simultaneously hydrogen. X and Y are preferably sodium, potassium or ammonium ions, with sodium being particularly preferred. Particularly advantageous are compounds II in which X and Y are sodium, R ^{5 is} a branched alkyl radical having 12 C atoms and R ^{6 is} hydrogen or R ⁵ . Industrial mixtures are used which have a share of 50 to 90 wt .-% of the monoalkylated product, an example Dowfas ^® 2A1 (trademark of Dow Chemical Company).

Trade names of emulsifiers are z. B. Dowfas ^® 2A1, Emulan ^® NP50, Dextrol ^® OC50, emulsifier 825S, Emulan ^® OG, Texapon ^® NSO, Nekanil ^® 9045, Lumiten ^® I-RA, Lumiten E3065, Disponil FES77, Lutensol AT18, Steinapol VSL, Emulphor NPS25.

The surfactant is usually used in amounts of from 0.1 to 10% by weight based on the polymerizing monomers.

Water-soluble inhibitors for the emulsion polymerization are z. For example, ammonium and alkali metal salts of peroxodisulfuric, z. For example, sodium peroxodisulfate, hydrogen peroxide or organic peroxides, z. B. tert-butyl hydroperoxide.

Particularly suitable are so-called reduction-oxidation (Red-Ox9 initiator systems.

The redox initiator systems consist of at least one mostly inorganic reducing agent and one inorganic or organic oxidizing agent.

The oxidation component is z. B. to the above-mentioned initiators for emulsion polymerization.

The reduction components are, for. B. to alkali metal salts of sulfurous acid, such as. For example, sodium sulfite, sodium hydrogen sulfite, alkali salts of Dischwefligen acid such as sodium, bisulfite addition compounds aliphatic aldehydes and ketones such as acetone bisulfite or reducing agents such as hydroxymethanesulfinic acid and salts thereof, or ascorbic acid. The red-ox initiator systems can be used with the concomitant use of soluble metal compounds whose metallic component can occur in multiple valence states.

Usual Red-Ox initiator systems are z. As ascorbic acid / iron (II) sulfate / sodium peroxydisulfate, tert-butyl hydroperoxide / sodium disulfite, tert-butyl hydroperoxide / Na-hydroxymethanesulfinic acid. The individual components, eg. As the reduction component, mixtures may also be z. B. a mixture of the sodium salt of hydroxymethanesulfinic acid and sodium sulfite.

The compounds mentioned are usually used in the form of aqueous solutions, the lower concentration being determined by the amount of water acceptable in the dispersion and the upper concentration by the solubility of the compounds in question in water. In general, the concentration is 0.1 to 30 wt .-%, preferably 0.5 to 20 wt .-%, particularly preferably 1.0 to 10 wt .-%, based on the solution.

The amount of initiators is generally 0.1 to 10 wt .-%, preferably 0.5 to 5 wt .-%, based on the monomers to be polymerized. It is also possible to use a plurality of different initiators in the emulsion polymerization.

In the polymerization regulators can be used, for. B. in amounts of 0 to 0.8 parts by weight, based on 100 parts by weight of the monomers to be polymerized, is reduced by the you molar mass. Suitable z. B. Compounds with a thiol group such as tert-butylmercaptan, Thioglycolsäureethylacrylester, mecaptoethynol, mercaptopropyltrimethoxysilane or tert-dodecylmercaptan. The proportion of these regulators may in particular be 0.05 to 0.8 parts by weight, preferably 0.1 to 0.5 parts by weight, based on 100 parts by weight of the monomers to be polymerized.

The emulsion polymerization is generally carried out at 30 to 130, preferably 50 to 90 ° C. The polymerization medium can consist of only water as well as of mixtures of water and of liquids which can be mixed with it, such as methanol. Preferably, only water is used. The emulsion polymerization can be carried out either as a batch process or in the form of a feed process, including stepwise and gradient processes. Preferably, the feed process in which one submits a portion of the polymerization, heated to the polymerization, polymerized and then the rest of the polymerization, usually over several spatially separate feeds, one or more of which monomers in pure or emulsified form, continuously, fed in stages or with the addition of a concentration gradient while maintaining the polymerization of the polymerization. In the polymerization can also z. B. be presented for better adjustment of the particle size of a polymer seed.

To remove the residual monomers, optionally after the end of the emulsion polymerization and all stages of the emulsion polymerization, i. H. after a conversion of all monomers of at least 95%, in particular 98% initiator added in order to bind residual monomers.

The polymer is preferably in the form of an aqueous dispersion. The solids content of the dispersion is preferably between 10 and 75, in particular 30 to 65 wt .-%.

• B) kann primäre Aminogruppen (-NH₂), sekundäre Aminogruppen (-NH-) oder beides enthalten.
• B) enthält mindestens 2 an ein N-Atom gebundene H-Atome; B) enthält also zumindest eine primäre Aminogruppe oder zwei sekundäre Aminogruppen.
• B) geht mit den Epoxygruppen von A) eine Vernetzungsreaktion ein, wobei sich die Aminogruppe an die Epoxygruppe wie folgt addiert:
  

The composition used according to the invention contains, in addition to the polymer A), the amino compound B).

• B) may contain primary amino groups (-NH ₂ ), secondary amino groups (-NH-) or both.
• B) contains at least 2 H atoms bonded to an N atom; B) thus contains at least one primary amino group or two secondary amino groups.
• B) enters into a crosslinking reaction with the epoxy groups of A), the amino group adding to the epoxy group as follows:
  

The secondary amino group obtained may add to an epoxy group once more.

The crosslinking reaction does not yet occur as long as B) is dissolved in the dispersion of A).

The aqueous composition of A) and B) is therefore storage-stable.

First the removal of the water, d. H. after application of the aqueous dispersion of A), which contains B), on the substrate to be coated and subsequent filming and removal of the water, the crosslinking occurs. For networking, a temperature increase is not necessary.

Compounds B) have, in particular, 2 to 6, more preferably 2 to 4, hydrogen atoms bonded to a nitrogen atom. For example, compounds B) having one or two primary amino groups are contemplated. The amino groups may also be part of a ring system.

Compounds B) are preferably water-soluble. In particular, at least 50 g, preferably at least 100 g of B) dissolve in 1 liter of water at 21 ° C. (1 bar).

Compounds B) are preferably low molecular weight. Their molecular weight is z. B. between 50 and 2000 g / mol, in particular 200 and 2000 g / mol.

Particularly suitable as B) are aliphatic hydrocarbons or else aliphatic polyethers having one or two primary amino groups, such as, for example, ethylenediamine, propylenediamine, tetramethylenediamine, pentamethyldiamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, polyethyleneimines, partially hydrolyzed polyvinylformamides, polyetheramines, ethylene oxide and Propylene oxide adducts such as the Texaco "Jeffamine", cyclohexanediamine and xylylenediamine, imidazole derivatives.

Very particular preference is given to polyetheramines, in particular those of an aliphatic polyether chain and terminal amino groups.

The amount of compound B) is preferably selected such that the molar ratio of the epoxy groups to the H atoms of the N atoms is 0.1: 1 to 10: 1, in particular 02: 1 to 5: 1.

In general, the amount by weight of B) 0.1 to 10 parts by weight, in particular 0.1 to 5 parts by weight per 100 parts by weight of polymer A) (solid).

Preferably, B) is added to the aqueous dispersion of A) and is dissolved in the dispersion water.

The composition is useful as a laminating adhesive, d. H. for permanent bonding of large-area substrates with each other. The composition may consist exclusively of A), preferably in the form of an aqueous dispersion, and compound B).

It may contain other additives for use, eg. As thickeners, flow control agents, stabilizers, fillers, pigments and tackifiers (tackifying resins).

As substrates to be bonded are z. Polymeric films, in particular polyethylene, oriented polypropylene, polyamide, polyethylene terephthalate, cellulose acetate, cellophane, with metal (eg aluminum coated (steamed) polymer films (in short: metallized films) or paper, cardboard or metal foils, in particular of aluminum. The so-called slides can also z. B. be printed with printing inks.

The laminating adhesive is applied to at least one large-area substrate, preferably with a layer thickness of 0.1 to 20, particularly preferably 2 to 15 g / m ² z. B. by doctoring, brushing etc ..

Preferably after drying or venting of the dispersion water (eg after 1 to 60 seconds), the coated substrate can then be laminated with a second substrate, wherein the temperature z. B. 20 to 200, preferably 20 to 70 ° C and the pressure z. B. 1 to 30, preferably 3 to 20 N / m ² may be.

Preferably, the adhesive-coated substrate is a transparent polymer film.

The polymer or the dispersion is preferably used as an adhesive for the Glanzfolienkaschierung.

In glossy film lamination, paper or cardboard or films are glued to transparent polymer films. The papers, cartons or films are preferably printed.

With the laminating adhesive used according to the invention, substrate composites having high adhesive strength, even in the region of grooves or embossings and high transparency and high gloss, are obtained.

Preparation of the polymer dispersions

In a 3 liter stirred stirrer / heater / cooler polymerisation reactor, a mixture of 160.0 g of deionized water and 4.85 g of a 33% by weight aqueous polymer latex (prepared by free-radically initiated emulsion polymerization of styrene) with a weight average Particle diameter D _w50 of 30 nm under nitrogen atmosphere heated to 90 ° C. At the aforementioned temperature, 8.96 g of a 7% strength by weight aqueous solution of sodium peroxodisulfate were added thereto.

After 3 minutes, feed 1 and feed 2 were started and metered in uniformly over 2 h.

Feed 1 was an aqueous emulsion prepared from 294.64 g deionized water 53.33 g of a 30 wt .-% aqueous solution of Disponil FES 77 ^® (ethoxylated C12-C14 Na sulphate) 6.4 g a 25% by weight aqueous solution of ammonia 16.0 g acrylic acid 2.0 g Glycidyl methacrylate (corresponds to 0.25% by weight) 169.36 g methyl methacrylate 612.64 g n-butyl acrylate.

Feed 2 was 80.64 g of a 7% strength by weight aqueous solution of sodium peroxodisulfate.

After the end of feeds 1 and 2, 30 min. touched. Then feed 3 and feed 4 were started and evenly over 60 min. added.

Feed 3 was a 5% by weight aqueous solution of hydrogen peroxide.

Feed 4 was a 5% by weight aqueous solution of ascorbic acid.

After the end of feeds 3 and 4 6.89 g of a 58 wt .-% aqueous solution of Lumiten ^® I-SC (Bernsteinsäureester) was added and then the reactor temperature was lowered to 25 ° C. The aqueous polymer dispersion obtained had a solids content of 55.6% by weight. The mean particle size was 249 nm.

In a similar manner, polymer dispersions were prepared with higher content of glycidyl methacrylate.

The composition is given in Table 1. Dispersion No. GMA (%) BA (%) MMA (%) AS (%) Equivalent epoxy group / per kg (mmol) 1 0.25 76.58 21.17 2.00 6.93 2 0.50 76.45 21.05 2.00 13.86 3 0.75 76.33 20.92 2.00 20.79 4 1.00 76.20 20.80 2.00 27.71

Abbreviations:

• GMA

  glycidyl

  BA

  n-butyl acrylate

  MMA

  methyl methacrylate

  AS

  acrylic acid

Mix with an amine

At room temperature, 250 g epoxy-containing polymer (0.95 mmol epoxy equivalent) was mixed with 0.25 g (0.95 mmol) polyether amine D400 (two primary amino groups, molecular weight 400 g / mol). Subsequently, the blends were determined according to the following rule the peel strength. Results are listed in Table 2.

Examples

feedstocks Acronal ^® A311 S: Aqueous crosslinkable dispersion of a Carboxyl-containing polyacrylate based on n-butyl acrylate for gloss film lamination Glass transition temperature = -55 ° C Commercial product of BASF Solids content: 55% by weight Plastilit ^® 3060: Polypropylenglycolalkylphenylether Plastomoll ^® DNA: diisononyl Solids content 100% Commercial product of BASF

The starting materials were mixed.

The amounts given in the table are the parts by weight of the aqueous dispersion (with water) and the parts by weight of plastilite or plastomoll.

All formulations additionally contain 1 part by weight of Lumiten I-SC (leveling agent) per 100 parts by weight of the sum of dispersion and plastilite or plastomoll.

Test Methods

peel strength

Oriented polypropylene (oPP) was coated with the admixture (18 g / m ² dry, 3 min., 90 ° C drying).

Subsequently, the peel strength (adhesion) was determined.

The coated carrier was cut into 25 mm wide test strips.

When determining the peel strength (adhesion), a 2.5 cm wide test strip was glued to different printed films or paper and rolled once with a 1 kg roll. It was clamped with one end in the upper jaws of a tensile-strain test apparatus after 24 hours storage at room temperature or alternatively at 50 ° C. The adhesive strip was peeled off the test surface at 300 mm / min at a 180 ° angle, ie the adhesive strip was bent over and pulled off parallel to the test plate and the required force was measured. The measure of the peel strength was the force in N / 2.5 cm, which averaged out of five measurements (mean MW). The test was carried out in standard climate. The same measurement was also carried out after 7 days storage at room temperature (21 ° C) or 50 ° C. Peel strength in N / 15 mm after 24 hours storage dispersion Storage at ... Chromolux ^® 700 / OPP MW Ikonogloss / oPP four-color printing / black area MW Chromosulphate / oPP four-color printing / black area MW oPP / oPP MW Acronal A311 S RT 50 ° C 3.4 4.1 3.3 4.7 3.0 4.3 3.1 3.0 1 RT 50 ° C 3.5 2.9 2.7 3.0 2.5 3.7 1.4 1.1 2 RT 50 ° C 3,1 2,3 2.5 3.1 2.3 3.6 1,1 1,2 3 RT 50 ° C 3,0 2,4 2,3,3,3 2.0 3.2 1.1 1.1 4 RT 50 ° C 3.2 2.0 1.8 3.0 1.6 2.9 0.6 1.4 Peel strength in N / 15 mm after 7 days of storage dispersion Storage at ... Chromolux ^® 700 / OPP MW Ikonogloss / oPP four-color printing / black area MW Chromosulphate / oPP four-color printing / black area MW oPP / oPP MW Acronal ^® A311 S RT 50 ° C 3.1 3.4 4.2 5.3 3.7 4.3 3.9 3.1 1 RT 50 ° C 3.4 3.1 2.9 3.9 2.6 4.1 1.0 1.6 2 RT 50 ° C 3,1 3,7 2.9 3.7 2.3 4.0 1.0 1.3 3 RT 50 ° C 3.3 4.1 2.5 3.7 2.0 3.3 1.0 1.3 4 RT 50 ° C 3.5 2.4 2,2 2,5 1.7 3.3 0.7 1.2

Claims (9)

Use of an aqueous composition comprising A) a polymer obtainable by free radical polymerization which contains 1 to 200 millimoles (mmol) of epoxy groups (calculated with a molecular weight of 42 g / mol) per 1 kg of polymer B) an amino compound having a total of at least 2 Nitrogen atom bound H atoms as Kaschierklebstoff, characterized in that the polymer is composed of at least 80 wt .-% of C1 to C20 alkyl (meth) acrylates. Use according to claim 1, characterized in that the polymer is an emulsion polymer and at least 80 wt .-% of C1 to C10 alkyl (meth) acrylates is constructed. Use according to one of claims 1 to 2, characterized in that the epoxy group is contained by copolymerization with glycidyl (meth) acrylate in the polymer. Use according to one of claims 1 to 3, characterized in that the amino compound B) contains at least two amino groups. Use according to one of claims 1 to 4, characterized in that the amino compound B) has a molecular weight of less than 2000 g / mol. Use according to one of claims 1 to 5, characterized in that the amino compound B) is water-soluble. Use according to any one of claims 1 to 6, characterized in that B) is a polyetheramine. Use according to one of claims 1 to 7, characterized in that the amount of B) is 0.1 to 10 parts by weight per 100 parts by weight of A). Use. The composition according to any one of claims 1 to 8 as laminating adhesives for the Glanzfolienkaschierung, d. H. for bonding transparent foils with paper, cardboard or foils.