Patent ID: 7696138

Claim:
A crosslinked reaction product obtained by A) mixing (i) an acylated alkylacrylate copolymer having a number average molecular weight ranging from about 5,000 to about 500,000, wherein the acylated alkylacrylate copolymer comprises from about 0.1 to about 20 weight percent of monomer units derived from an unsaturated anhydride monomer; with ii) a hydrocarbyl acylating agent having a number average molecular weight ranging from about 500 to about 5000 to obtain a mixture of component (i) and component (ii); and crosslinking the mixture of component (i) and component (ii) with component (iii) a compound selected from the group consisting of (a) a polyamine; (b) a polyol; and (c) an aminoalcohol to provide a crosslinked polyalkylacrylate copolymer, wherein a mole ratio of component (i) to component (ii) in the mixture ranges from about 1:10 to about 5:1.