Patent ID: 6277900
Filing Date: 2001-08-21
Classification: C04B,C08F,C09K

Abstract:
A copolymer consisting of(a) 1-99% by weight of structural units of the formula (1) ##STR6##where R.sup.1 is hydrogen or methyl, R.sup.4 is C.sub.1 -C.sub.22 -alkylene, R.sup.5 is C.sub.1 -C.sub.22 -alkyl or hydrogen, and X is ammonium, lithium, sodium, potassium, an amine or a mixture of these substances, and(b) 99-1% by weight of structural units of the formula (2) ##STR7##where R.sup.1 is hydrogen or methyl, R.sup.2 and R.sup.3, independently of one another, are hydrogen, or C.sub.2 -C.sub.22 -alkyl,wherein component b) is not hydrolyzed and the copolymers have been prepared by a solution precipitation polymerization in a nonaqueous solvent or a water-miscible, organic solvent having a low water content which is a precipitant for the copolymer.