Organic dispersion polymers based on ethylenically unsaturated monomers

Abstract

Dispersion polymers of ethylenically unsaturated monomers which are prepared in the presence of protective colloids and if appropriate emulsifiers by polymerization in an aqueous medium and are present in aqueous dispersion form or in finely dispersed dry powder form. They contain, as protective colloids, water-soluble graft polymers containing vinyl alcohol units on a polyurethane grafting base, the polyurethane grafting bases containing at least 2 urethane groups in the molecule prepared by reacting diisocyanates and diols, and polymer radicals of units of carboxylic acid vinyl esters having 3 to 20 carbon atoms and/or hydrolysis products thereof and if appropriate units of other ethylenically unsaturated monomers and/or hydrolysis products thereof being grafted onto the polyurethane grafting bases. The amount of vinyl alcohol units in the water-soluble graft polymers is at least 20% by weight and the degree of hydrolysis of the monomer units originally grafted onto the polyurethane grafting bases is at least 50 mol%. The organic dispersion polymers are useful as a coating composition, as binders for building materials and as a starting material for the preparation of molding compositions, adhesives, binders, impregnating agents and paints.