Patent ID: 6864309

Claim:
A copolymer composition comprising water insoluble graft copolymer particles, wherein the graft copolymer particles comprise: (a) from 2 weight percent to 90 weight percent of macromonomer, as polymerized units, based on the total weight of the copolymer, wherein: (i) the macromonomer is water insoluble and comprises from 10 to 1000 polymerized units of at least one first ethylenically unsaturated monomer, no polymerized mercapto-olefin compounds, and less than 5 weight percent polymerized acid-containing monomer; (ii) the macromonomer is a macromonomer prepared by aqueous based polymerization; and (iii) said macromonomer has a molecular weight distribution such that its ratio of Mw/Mn is at least 1.25, wherein said Mw is the weight average molecular weight of the macromonomer and said Mn is the number average molecular weight of said macromonomer; and (b) from 10 weight percent to 98 weight percent of polymerized units of at least one second ethylenically unsaturated monomer, based on the total weight of the copolymer.