Patent ID: 7651993

Claim:
A fluorine-containing copolymer comprising: (A) repeating units derived from a fluorine-containing macromonomer of the general formula: CH 2 ═C(—X)—COO—(Y) l -Z—M f m M r n —H (I) wherein X is a hydrogen atom or a methyl group; Y is —CH 2 CH(OH)CH 2 — or R 1 —NHCO— where R 1 is —(CH 2 CH 2 O) a (CH 2 ) b , a is 0 to 20, and b is 1 to 20; l is 0 or 1; Z is —L 1 —L 2 —S— where L 1 is a direct bond, —O—, COO— or NH—, L 2 is an alkylene group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms, and S is a sulfur atom; M f m M r n is a fluorochemical oligomer having m repeating units derived from a fluorine-containing monomer (M f ) and n repeating units derived from a fluorine-free monomer (M r ) where m is 2 to 50 and n is 0 to 20, and (B) repeating units derived from a polyalkyleneglycol (meth)acrylate, wherein the fluorine-free monomer (M r ) is a polymerizable monomer having an unsaturated double bond, and wherein the fluorine-containing monomer (M f ) is of the general formula: CH 2 ═C(—X)—C(═O)—Y—[—(CH 2 ) m —Z—] p —(CH 2 ) n —Rf (Ia) wherein X is a hydrogen atom, a methyl group, a straight-chain or branched alkyl group having 1 to 21 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, a iodine atom, a CFX 1 X 2 group wherein X 1 and X 2 represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom, a cyano group, a straight-chain or branched fluoroalkyl group having 1 to 21 carbon atoms, a substituted or an unsubstituted benzyl group, or a substituted or an unsubstituted phenyl group; Y is —O— or —NH—; Z is —S— or —SO 2 —; Rf is a fluoroalkyl group having 1 to 21; m is 1 to 10, n is 0 to 10, and p is 0 or 1.