Water-soluble copolymers, their preparation and their use

Details Water-soluble copolymers, their preparation and their use Water-soluble copolymers, their preparation and their use

C - Chemistry, Metallurgy

08

F

402/403, 402/412

C08F 220/04 (2006.01) A01N 25/26 (2006.01)

Patent

CA 1329677

Abstract of the Disclosure: Water-soluble copolymers having a K value of from 15 to 120 (determined on the sodium salt according to H. Fikentscher in aqueous solu- tion at 25°C, a pH of 7 and a polymer concentration of the Na salt of 1% by weight) contain, in the polymerized form, a) from 99.5 to 80 mol % of one or more monoethylenically unsaturated C3-C6-monocarboxylic acids and b) from 0.5 to 20 mol % of one or more comonomers which possess two or more ethylenically unsaturated, non- conjugated double bonds, are derived from esters and are obtainable by esterification of b1) monoethylenically unsaturated C3-C6-monocarboxylic acids with b2) polyhydric alcohols of 2 to 6 carbon atoms, poly- alkylene glycols, polyglycerols, polyvinyl alcohol and monohydric, monoethylenically unsaturated C3- C6-alcohols and c) from 0 to 30 mol % of other water-soluble, monoethyleni- cally unsaturated monomers which are copolymerizable with a) and b), the copolymers containing Polymer segments which consist of units of the monomers a) and c), have a weight average molecular weight of not more than 15,000 and are bonded to one another via units of b).

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