PROCESS FOR PRODUCING DISPERSIONS OF WATER-SOLUBLE VINYL POLYMERS AND STABILIZER FOR CARRYING OUT THE PROCESS

摘要

PCT No. PCT/DE97/00288 Sec. 371 Date Oct. 5, 1998 Sec. 102(e) Date Oct. 5, 1998 PCT Filed Feb. 10, 1997 PCT Pub. No. WO97/30094 PCT Pub. Date Aug. 21, 1997The present invention concerns a process for producing dispersions of water-soluble vinyl polymers and a stabilizer for carrying out this process. Such water-soluble, particularly cationic vinyl polymers, are employed on a large scale as process expediters for carrying out, for instance, separating processes in water treatment or waste-water purification, respectively, in the paper, coal and ore industries, in oil production or also in the food stuff industry, among others, for floculation, coagulation, retention or dewatering. According to the present invention, water-soluble vinyl polymers are homo- or copolymerized in the presence of a dispersion stabilizer of the invention. The stabilizer consists of a graft copolymer whose backbone is formed by polyethylene oxide and its grafted branches of cationic vinyl monomers. Among others, cationic, hydrophobically modified vinyl monomers can be advantageously employed. Copolymerizations can be carried out between cationic or non-ionic hydrophobically modified vinyl polymers and cationic or non-ionic, non-hydrophobically modified vinyl polymers.