Use of meltable acrylate polymers for producing contact adhesive layers

  • US 9,212,291 B2
  • Filed: 03/30/2009
  • Issued: 12/15/2015
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
Patent Images

1. A reclosable pack, comprising:

  • at least one multilayer film comprising;

    a) a backing film selected from the group consisting of a transparent polymer film and a metallized polymer film,b) a layer of pressure-sensitive adhesive formed from an acrylate polymer having a glass transition temperature<



    20°

    C., determined according to ASTM-D 3418/82, comprising 1 to 30 mmol of a copolymerized photoinitiator per kg of acrylate polymer, the acrylate polymer comprising, in reacted form, monoethylenically unsaturated monomers M and the copolymerized photoinitiator, the monomers M comprising;

    b1) at least 80% by weight, based on the total weight of the acrylate polymer, of at least one monomer A selected from the group consisting of C3-C20 alkyl acrylates;

    b2) 1 to 20% by weight of at least one monomer B selected from the group consisting of C1-C4 alkyl methacrylates, methyl acrylate, and ethyl acrylate;

    b3) up to 10% by weight of at least one nonaromatic, monoethylenically unsaturated monomer C, which is selected from the group consisting of monoethylenically unsaturated C3-C8 monocarboxylic acids, amides of monoethylenically unsaturated C3-C8 monocarboxylic acids, monoethylenically unsaturated C4-C8 dicarboxylic acids, mono-C1-C20 alkyl esters of monoethylenically unsaturated C4-C8 dicarboxylic acids, and hydroxyalkyl esters of monoethylenically unsaturated C3-C8 monocarboxylic acids,wherein weight fractions of monomers A, B and C add up to 100% by weight, and the acrylate polymer is crosslinked by UV radiation,wherein the photoinitiator has the formula (I);

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