Method for producing copolymers rich carboxylate from monocarboxylic acids and monoethylenically unsaturated dicarboxylic rich carboxylate and copolymers having a low degree of netutralizacion.

摘要

A process for the preparation of a rich copolymer carboxylate from monocarboxylic acids and unsaturated dicarboxylic monoethylenically having an average molecular weight Mw of at least 3,000 g / mol by means of free radical polymerization in aqueous solution of the following monomers: and / or (a) 30% to 79.99% by weight of at least one ethylenically unsaturated monocarboxylic acid, (B) 20.01% to 70% by weight of at least one ethylenically unsaturated dicarboxylic acid of the general formula (HOOC) R 1 C = CR 2 (COOH) (I), R 1 R 2 C = C (- (CH 2) n-COOH) (COOH) (II) or the corresponding carboxylic anhydrides and / or other hydrolyzable derivatives, being R 1 and R 2 independently of one another H or a straight or branched chain, optionally substituted alkyl radical having from 1 to 20 carbon atoms, or, in the case of (I), wherein both R 1 and R 2 one optionally substituted alkylene radical having 3 to 20 carbon atoms, and being nu integer n from 0 to 5, and (C) 0% to 40% by weight of at least one ethylenically unsaturated comonomer additional, different from (A) and (B) being based quantities in each case on the total amount of all the monomers used, wherein the polymerization is carried out in the presence of 3 to 16 mol% of at least one amine, based on the total amount of all COOH groups of the monocarboxylic and dicarboxylic acids, at a temperature of 80 ° C to less than 130 ° C.