Patent ID: 8703864

Claim:
A water/oil repellent composition comprising: a copolymer comprising first polymerized units derived from a monomer (a) and second polymerized units derived from a monomer (b), wherein the second polymerized units are included in an amount of 30 to 80 mol % with respect to a total of the first polymerized units and the second polymerized units, the monomer (a) is a compound of formula (1): (Z—Y) n X (1) wherein Z is a C 1-6 perfluoroalkyl group or a group of formula (2), Y is a bivalent organic group or a single bond, n is 1 or 2, and X is one of groups of formulae (3-1) to (3-5) when n is 1, or one of groups of formulae (4-1) to (4-4) when n is 2: C i F 2i+1 O(CFX 1 CF 2 O) j CFX 2 — (2) where 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) where R is a hydrogen atom, a methyl group or a halogen atom, and φ represents 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) wherein R is a hydrogen atom, a methyl group or a halogen atom, and m is an integer of from 0 to 4; and the monomer (b) is a (meth)acrylate having no polyfluoroalkyl group and having a C 20-30 alkyl group, wherein the copolymer further comprises third polymerized units derived from a monomer (c) in an amount of 4.9 to 21 mass % with respect to a total amount of the copolymer, and the monomer (c) is vinyl chloride.