Patent ID: 6696517
Filing Date: 2004-02-24
Classification: C08F

Abstract:
A process for thickening a preparation comprising an organic solvent said process comprising adding to the preparation of at least one copolymer, consisting essentially ofa1) 1 to 50% by weight of the repeat structural unit of the formula (1 ): â€ƒwhere n is an integer from 2 to 9 or a2) 1 to 50% by weight of a mixture of the repeat structural unit of the formula (1) and of the repeat structural unit of the formula (2): â€ƒwhere R, R1 and R2 may be identical or different and are hydrogen or a linear or branched alkyl or alkenyl group having in each case 1 to 30 carbon atoms, and b) 49.99 to 98.99% by weight of the repeat structural unit of the formula (3): â€ƒin which R3 is hydrogen, methyl or ethyl, Z is (C1-C8)-alkylene and X is an ammonium, alkali metal or alkaline earth metal ion and c) 0.01 to 8% by weight of a crosslinking structure which originates from monomers having at least two olefinic double bonds, wherein the structural unit of c) is derived from the group consisting of allyl acrylate, allyl methacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, and mixtures thereof.