Patent ID: 7754836

Claim:
A water- and oil-repellent agent comprising: (A) a fluorine-containing copolymer which comprises repeating units derived from: (a1) a fluoroalkyl group-containing polymerizable monomer of the formula: wherein Y is a divalent organic group selected from the group consisting of an aliphatic group having 1 to 10 carbon atoms, an aromatic or cycloaliphatic group having 6 to 10 carbon atoms, a —SO 2 N(R 1 )R 2 — group (in which R 1 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R 2 is an alkylene group having 1 to 10 carbon atoms), a —CON(R 1 )R 2 — group (in which R 1 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R 2 is an alkylene group having 1 to 10 carbon atoms), and a —CH 2 CH(OY 1 )CH 2 — group (in which Y 1 is a hydrogen atom or an acyl group having 1 to 4 carbon atoms); and Rf is a linear or branched fluoroalkyl or fluoroalkenyl group having 1 to 6 carbon atoms; (a2) vinylidene chloride; optionally (a3) (meth)acrylate having a linear or branched alkyl or alkenyl group, or cycloaliphatic alkyl or alkenyl group; and, optionally (a4) a polymerizable monomer containing a crosslinking group or a hydrophilic group, other than the monomers (a1), (a2) and (a3).