Patent ID: 6063884
Filing Date: 2000-05-16
Classification: B01D,C02F,C08F,C11D

Abstract:
A method of manufacturing homopolymers and/or copolymers, comprising:contacting ethylenically monounsaturated monomer(s) in an aqueous solution with a chain-transfer agent having a phosphorus atom of degree of oxidation less than 5, said phosphorous compound being introduced in amounts of 0.005-0.49 gram-atom phosphorus per mol of unsaturation in said ethylenically unsaturated monomer(s) in the presence of an initiator consisting of hydrogen peroxide in the absence of any agent(s) which decomposes hydrogen peroxide thereby forming free radicals, in the absence of any other generator of free radicals, and in the absence of any per salt or any other transfer agent, wherein for each monomer, the residual monomer concentration in said polymer is less than or equal to 300 ppm, based on the weight of the raw product, wherein the dry matter content is at least 38%, and wherein these constraints apply regardless of the monomer composition.