Patent ID: 6756471
Filing Date: 2004-06-29
Classification: C04B,C08F,C08G,C08L

Abstract:
A process for the preparation of water-soluble polymers containing polyalkylene glycol ether side chains and having molecular weights of from 15,000 to 65,000, comprisingpolymerizing in solution a monomer or a mixture of monomers comprising at least one ester of an ethylenically unsaturated carboxylic acid and a polyalkylene glycol wherein the ester is masked on the end groups at one end, in at least one hydrocarbon in the presence of one or more free-radical-forming polymerization initiators to form a polymer or a copolymer, removing the hydrocarbon at temperatures of up to 200Â° C., and dissolving the polymer or copolymer in water to give a from 50 to 80% strength by weight solution of the polymer or copolymer in water wherein the concentration of the monomer or the monomer mixture in the hydrocarbon is from 70 to 95% by weight.