Patent ID: 6746555
Filing Date: 2004-06-08
Classification: C08F,C08L,C09J

Abstract:
A low-emission adhesive comprising an aqueous, protective-colloid-free polymer dispersion or water-redispersible dispersion powder prepared therefrom, of vinyl ester-ethylene copolymers containing free carboxylic acid groups, obtained by free-radically initiated emulsion polymerization, in aqueous solution and in the presence of at least one emulsifier, of a comonomer mixture comprisinga) from 5 to 50% by weight of ethylene, b) from 20 to 80% by weight of at least one vinyl ester selected from the group consisting of vinyl esters of unbranched or branched carboxylic acids having 1 to 9 carbon atoms whose homopolymers have a glass transition temperature Tg >0Â° C., c) from 5 to 70% by weight of at least one vinyl ester selected from the group consisting of a vinyl ester of a branched carboxylic acids having 8 to 13 carbon atoms whose homopolymers have a glass transition temperature Tg <0Â° C., d) from 0.5 to 10% by weight of at least one ethylenically unsaturated monocarboxylic or dicarboxylic acid having 3 to 4 carbon atoms, e) from 0 to 10% by weight of at least one ethylenically unsaturated hydroxyalkyl-functional comonomer, f) from 0 to 10% by weight of a further mono- or polyethylenically unsaturated comonomer, the % by weight being based in each case on the overall weight of the comonomers and adding up to 100% by weight, and the dispersion obtained therewith optionally being dried, wherein said vinyl ester-ethylene copolymers are free of moieties derived from (meth)acrylate alkyl esters, and wherein said copolymers have a glass transition temperature of between âˆ’60Â° C. and about âˆ’10Â° C.