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AssigneeRohm and Haas Company
InventorsC. Damien Rodowski, Charles J. Rand, Barry Weinstein, James DeFelippis
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The present invention provides telomeric copolymers of acrylic and methacrylic acid which further comprise an olefin polymerization residue and have one or more phosphorus acid groups wherein the phosphorus acid group comprises one or more phosphorus atom in the +1 oxidation state or in the +3 oxidation state, or both. In addition the present invention provides methods of making the telomeric copolymers comprising aqueous solution copolymerizing a monomer mixture comprising acrylic acid and methacrylic acid in the presence of a phosphorus acid group containing reactant having a phosphorus atom in the +1 oxidation state, and thermally treating the resulting telomeric copolymer at 175° C. or higher for a sufficient time to decarboxylate the copolymer.
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)—).
Dependencies are inferred from the claim text.