Patent ID: 6538057
Filing Date: 2003-03-25
Classification: C09J

Abstract:
An adhesive comprising from 5.0 to 95.0% by weight of an adhesive dispersion having a viscosity in the range from 2000 to 10,000 mPaÂ·s, said adhesive dispersion consisting essentially of1) an aqueous polymer dispersion which is obtained by i) reacting a water soluble monomer B selected from the group consisting of acrylic acid, methacrylic acid, and mixtures thereof, with or without a further monomer A selected from the group consisting of esters of &agr;,&bgr;-unsaturated C3-C6 mono- and dicarboxylic acids, and vinylaromatic compounds; by free radical aqueous emulsion polymerization, to give a water-soluble prepolymer, and then without isolating the prepolymer; ii) reacting a monomer mixture M, which comprises: A) 50 to 100% by weight, of at least one ethylenically unsaturated monomer A; and B) from 0 to 50% by weight of a comonomer C, by free-radical aqueous emulsion polymerization in the presence of a protective colloid, which is said water-soluble prepolyrner, to give a polymer P; wherein the water-soluble prepolymer comprises from 0.2 to 1.5% by weight of at least one polymerized unit of monomer B, based on the overall amount of the monomers M and the prepolymer; and the following optional ingredients:2) a base selected from the group consisting of alkali metal hydroxides, ammonia and volatile organic amines; and 3) one or more further additives selected from the group consisting of a polysaccharide, a protein, a protein degradation product, a filler, an emulsifier, water and mixtures thereof.