from Rohm and Haas
Patent No. U.S. 6,797,328 B2
Rohm and Haas Company has been granted a patent for an aqueous dispersion that is comprised of a plurality of water insoluble segmental copolymer particles, wherein the particles comprise comb copolymer. The comb copolymer is comprised of from two percent weight to 90% weight of macromonomer, as polymerized units, based on the total weight of the comb copolymer. The macromonomer is water insoluble and comprises from ten to 1,000 polymerized units of at least one first ethylenically unsaturated monomer, no polymerized mercapto-olefin compounds, and less than five percent weight polymerized acid-containing monomer. The macromonomer has a molecular weight distribution such that its ratio of Mw/Mn is at least 1.25, wherein the Mw is the weight average molecular weight of the macromonomer and the Mn is the number average molecular weight of the macromonomer. The macromonomer is prepared by aqueous based polymerization; and from 10-98% of polymerized units of at least one second ethylenically unsaturated monomer, based on the total weight of the comb copolymer.