Patent ID: 9284396
Filing Date: 2016-03-15
CPC Classification: C08F,C08J,C08K,C08L

Claim Text:
1. A copolymer composition comprising a phosphorus acid group containing telomeric copolymer of acrylic acid and methacrylic acid and/or salts thereof having a weight average molecular weight (Mw) of up to 20,000, and having an average of (i) from 19 to 74 wt. % of the copolymerization residue of methacrylic acid, anhydride, or its salts, (ii) from 1 to 20 wt. % of phosphorus acid groups chosen from hypophosphite, phosphite, alkyl phosphinate, alkyl phosphonate, dialkyl phosphinate, and mixtures thereof, (iii) from 0 to 20 wt. % of the copolymerization residue of a third vinyl monomer, and (iv) from 25 to 80 wt. % of the copolymerization residue of acrylic acid, anhydride, or its salts, the wt. % of all monomers and phosphorus acid group forming reactants being based on the total weight of reactants used to make the telomeric copolymer, wherein the telomeric copolymer comprises at least one copolymerization residue of propene (—CH2—CH(CH3)—).