Patent ID: 6093766
Filing Date: 2000-07-25
Classification: C08F

Abstract:
A process for preparing a heterogeneous polyvinyl ester dispersion stabilized essentially with polyvinyl alcohol, without the addition of solvents or plasticizers, having a minimum film-forming temperature of below 10.degree. C., comprising the formation of a copolymer A, having a glass transition temperature of more that 20.degree. C., by seed emulsion polymerization of a monomer mixture comprising 85-100% by weight of a vinyl ester of carboxylic acids having 1 to 18 carbon atoms (a1), 0-10% by weight of an .alpha.,.beta.-unsaturated carboxylic acid (a2) and/or of an N-functional compound (a3) and 0-5% by weight of a polyethylenically unsaturated monomer (a4), in the presence of a seed base comprising a copolymer B having a glass transition temperature of below 20.degree. C., comprising 45-98% by weight of a vinyl ester of carboxylic acids having 1 to 18 carbon atoms (b1), 2-50% by weight of an .alpha.-olefin having 1 to 4 carbon atoms (b2) and 0-5% by weight of a polyethylenically unsaturated monomer (b3).