Patent ID: 7989567

Claim:
A method for producing a water/oil repellent composition, which comprises polymerizing a monomer component comprising the following monomer (a) in coexistence with the following compound (x) in a medium in the presence of a surfactant and a polymerization initiator: monomer (a): a compound of the following formula (1): (Z—Y) n X (1) wherein Z is a C 1-20 polyfluoroalkyl group or a group of the following formula (2), Y is —CH 2 —, —CH 2 CH 2 —, —(CH 2 ) 3 —, —CH 2 CH 2 CH(CH 3 )—, or —CH═CH—CH 2 —, n is 1 or 2, and X is one of groups of the following formulae (3-1) to (3-5) when n is 1, or one of groups of the following 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) wherein i is an integer of from 1 to 6, j is an integer of from 0 to 10, and each of X i and X 2 which are independent of each other, 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 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; compound (x): a compound having at least two groups of the following formula (5): —(CH 2 ) a —CHR 1 —(CH 2 ) b —SH (5) wherein R 1 is a methyl group or an ethyl group, a is an integer of from 0 to 2, and b is 0 or 1.