Water-soluble copolymers, process for their preparation and their use

摘要

Water-soluble copolymers having a K value of from 15 to 120 (determined by the method of H. Fikentscher on the sodium salt in aqueous solution at 25@C, a pH of 7 and a polymer concentration of the Na salt of 1 % by weight) which, in polymerised form, contain a) from 99.5 to 80 mol % of at least one monoethylenically unsaturated C3- to C6-monocarboxylic acid, b) from 0.5 to 20 mol % of a comonomer containing at least two ethylenically unsaturated, non-conjugated double bonds and at least one -CO-OX group and/or a salt thereof with an alkali metal, ammonium or alkaline earth metal base, the preparation of the water-soluble copolymers by copolymerisation of the monomers a) and b) in aqueous solution, and the use of the copolymers for coating seed.