Patent ID: 7196133

Claim:
A surface tension control agent for coating materials comprising: a fluorine-containing (meth)acryl type copolymer obtained by copolymerization of monomers consisting of: a fluorine-substituted alkyl (meth)acrylate monomer (A); n-butyl acrylate monomer or an alkyl (meth)acrylate monomer (B) having the alkyl group selected from the group consisting of lauryl and stearyl; a hydroxyl group- or ether group-substituted alkyl (meth)acrylate monomer (C); and optionally at least one kind of vinyl monomer (D) selected from the group consisting of styrene, alkyl vinyl ether, alpha-olefin and maleic anhydride, wherein the ratio of (A) to {(B)+(C)} in the copolymer is in the range of 3–60 parts by weight to 40–97 parts by weight.