Patent ID: 7094852
Filing Date: 2006-08-22
Classification: C02F,C08F,C23F

Abstract:
1. A process for utilizing hypophosphorous acid or its salts thereof as a chain transfer agent in the aqueous polymerization of acrylic acid with allyloxy monomers to form an acrylic acid copolymer, comprising: a) charging the allyloxy monomer initially to the polymerization reactor; b) metering into the polymerization reactor the hypophosphorous acid and acrylic acid feeds in a staggered fashion such that the hypophosphorous acid feed is from 0% to 75% the duration of the acrylic acid feed; c) simultaneously charging a water-soluble initiator to the polymerization reactor wherein the duration of the initiator feed is from 0% to 150% the duration of the acrylic acid feed, wherein at least 75 mole % of the hypophosphorous acid charged is incorporated into the resulting polymer matrix.