Method for production of water/oil repellent composition and article

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)nX (1)
• wherein Z is a C1-20 polyfluoroalkyl group or a group of the following formula (2), Y is —CH2—, —CH2CH2—, —(CH2)3—, —CH2CH2CH(CH3)—, or —CH═CH—CH2—, 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;
• CiF2i+1O(CFX1CF2O)jCFX2— (2)
• wherein i is an integer of from 1 to 6, j is an integer of from 0 to 10, and each of Xi and X2 which are independent of each other, is a fluorine atom or a trifluoromethyl group;
• —CR═CH2 (3-1)
• —C(O)OCR═CH2 (3-2)
• —OC(O)CR═CH2 (3-3)
• —OCH2-φ-CR═CH2 (3-4)
• —OCH═CH2 (3-5)
• wherein R is a hydrogen atom, a methyl group or a halogen atom, and φ represents a phenylene group;
• —CH[—(CH2)m—CR═CH2]— (4-1)
• —CH[—(CH2)m—C(O)OCR═CH2]— (4-2)
• —CH[—(CH2)m—OC(O)CR═CH2]— (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):
• —(CH2)a—CHR1—(CH2)b—SH (5)
• wherein R1 is a methyl group or an ethyl group, a is an integer of from 0 to 2, and b is 0 or 1.