Polymethacrylic acid anhydride telomers
AssigneesDow Global Technologies LLC, Rohm and Haas Company
InventorsCharles J. Rand, Sudhir M. Mulik, Thomas Oswald, C. D. Rodowski, Barry Weinstein
Life of this patent
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Abstract
The present invention provides compositions of phosphorus acid group and methacrylic anhydride group containing telomeric copolymers of methacrylic acid having an as yet never achieved amount of more than 70 wt. %, or, preferably, 72 wt. % or more, and up to 99 wt. %, of methacrylic anhydride groups based on the total weight of polymerized methacrylic acid and/or salt units. The compositions enjoy higher thermal stability than was previously achieved and enable easer processing that does not require the removal of liquids or solvents.
Claims10
A polymer composition comprising at least one phosphorus acid group and methacrylic anhydride group containing telomeric copolymer of methacrylic acid and/or its salts having an average of more than 70 wt. % to 99 wt. % of methacrylic anhydride groups, based on the total weight of methacrylic acid polymerized units in the copolymer, all anhydride percentages as determined by titration, and having a weight average molecular weight (Mw) of from 1,000 to 100,000.
A method of making a phosphorus acid group and methacrylic anhydride group containing telomeric copolymer of methacrylic acid and/or its salts having an average of more than 70 wt. % to 99 wt. % of methacrylic anhydride groups, based on the total weight of methacrylic acid polymerized units in the copolymer, all anhydride percentages as determined by titration, comprising melting under shear the telomeric copolymer of methacrylic acid at a temperature of from 190 to 260° C., all temperatures being that of the telomeric copolymer.
Dependencies are inferred from the claim text.