Patent ID: 6858164

Claim:
A polymer comprising units obtained from a monomer having an acidic group or a basic group capable of undergoing an acid-base dissociation in a silicone oil and a monomer having the following formula (1): wherein R 1 represents a hydrogen atom or a methyl group; R 2 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; n is an integer; and x is an integer of from 1 to 3, wherein the polymer is soluble in a silicone oil; wherein the monomer having an acidic group or a basic group is a member selected from the group consisting of (meth)acrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, fumaric acid, cinnamic acid, crotonic acid, vinylbenzoic acid, 2-methacryloxyethylsuccinic acid, 2-methacryloxyethylmaleic acid, 2-methacryloxyethylhexahydrophthalic acid, 2-methacryloxyethyltrimellitic acid, vinylsulfonic acid, allylsulfonic acid, styrenesulfonic acid, 2-sulfoethyl methacrylate, 2-acrylamide-2-methylpropanesulfonic acid, 3-chloroamidephosphoxypropyl methacrylate, 2-methacryloyloxyethylacid phosphate, hydroxystyrene, N-methylaminoethyl (meth)acrylate, N-ethylaminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N-dibutylaminoethyl acrylate, N-phenylaminoethyl methacrylate, N,N-diphenylaminoethyl methacrylate, aminostyrene, dimethylaminostyrene, N-methylaminoethylstyrene, dimethylaminoethoxystyrene diphenylaminoethylstyrene, N-phenylaminoethylstyrene, 2-N-piperidylethyl (meth)acrylate, 2-vinyl pyridine, 4-vinyl pyridine and 2-vinyl-6-methyl pyridine.