Patent ID: 6197871
Filing Date: 2001-03-06
Classification: C08F

Abstract:
A thickener in the form of an aqueous dispersion or power and which is based on carboxyl- and carboxamido-containing addition polymers obtainable by free-radical emulsion or suspension polymerization in an aqueous phase of:a) from 30 to 70% by weight of a carboxylic acid group-containing ethylenically unsaturated monomers;b) from 10 to 70% by weight of a carboxylic acid amide group-containing ethylencially unsaturated monomers andc) from 0.1 to 30% by weight of further ethylenically unsaturated hydrophobic monomers selected from the group consisting of vinyl esters, (meth)acrylates and vinylaromatic compoundsin the presence of at least 5% by weight of at least one water-soluble protective colloid selected from the group consisting of non-grafted polyvinyl alcohols, non-grafted polyvinyl pyrrolidones and non-grafted (meth)acrylate-(meth)acrylic acid copolymers, the percentages by weight being based in each case on the overall weight of the comonomers.