Patent ID: 8853337

Claim:
A water/oil repellent composition comprising: a fluorinated polymer (A) having structural units based on the following monomer (a) and structural units based on the following monomer (b); a fluorinated polymer (B) (excluding the fluorinated polymer (A)) having structural units based on the following monomer (c); and an aqueous medium (C): monomer (a): a compound represented by the following formula (1): (Z—Y) n X (1) wherein Z is a C 1-6 polyfluoroalkyl group or a group represented by the following formula (2), Y is a bivalent organic group or a single bond, n is 1 or 2, and X is, when n is 1, any one of the groups represented by the following formulae (3-1) to (3-5) and, when n is 2, any one of the groups represented by the following formulae (4-1) to (4-4): C i F 2i+1 O(CFX 1 CF 2 O) j CFX 2 — (2) wherein i is an integer of from 1 to 6, j is an integer of from 0 to 10, and each of X 1 and X 2 is a fluorine atom or a trifluoromethyl group; —CR═CH 2 (3-1) —C(O)OCR═CH 2 (3-2) —OC(O)CR═CH 2 (3-3) —OCH 2 -Φ-CR═CH 2 (3-4) —OCH═CH 2 (3-5) wherein R is a hydrogen atom, a methyl group or a halogen atom, and Φ is a phenylene group; —CH[—(CH 2 ) m CR═CH 2 ]— (4-1) —CH[—(CH 2 ) m C(O)OCR═CH 2 ]— (4-2) —CH[—(CH 2 ) m OC(O)CR═CH 2 ]— (4-3) —OC(O)CH═CHC(O)O— (4-4) where R is a hydrogen atom, a methyl group or a halogen atom, and m is an integer of from 0 to 4; monomer (b): a (meth)acrylate having no polyfluoroalkyl group and having a C 18-30 alkyl group; monomer (c): a fluoroolefin selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene and vinylidene fluoride.