Water/oil repellent composition and article

A water/oil repellent composition which comprises a copolymer (A) having from 60 to 95 mass % of units based on the following monomer (a1) and from 5 to 40 mass % of units based on the following monomer (a2),

• a copolymer (B) having from 50 to 95 mass % of units based on the following monomer (b1) and from 5 to 50 mass % of units based on the following monomer (b2), and
• a medium (C),
• wherein the proportion of the copolymer (A) is from 70 to 90 mass %, and the proportion of the copolymer (B) is from 10 to 30 mass % relative to the total amount (100 mass %) of the copolymer (A) and the copolymer (B):
• monomer (a1):
• a compound represented by the following formula (1):
• (Z—Y)nX (1)
• wherein Z is a C1-6 polyfluoroalkyl group or a group represented by the following formula (2), Y is a bivalent organic group having no fluorine atom, 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):
• 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 X1 and X2 is a fluorine atom or a trifluoromethyl group;
• —CR2═CH2 (3-1)
• —C(O)OCR2═CH2 (3-2)
• —OC(O)CR2═CH2 (3-3)
• —OCH2—φ—CR2═CH2 (3-4)
• —OCH═CH2 (3-5)
• wherein R2 is a hydrogen atom, a methyl group or a halogen atom, and φ is a phenylene group;
• —CH[—(CH2)mCR3═CH2]— (4-1)
• —CH[—(CH2)mC(O)OCR3═CH2]— (4-2)
• —CH[—(CH2)mOC(O)CR3═CH2]— (4-3)
• —OC(O)CH═CHC(O)O— (4-4)
• where R3 is a hydrogen atom, a methyl group or a halogen atom, and m is an integer of from 0 to 4;
• monomer (a2):
• vinylidene chloride;
• monomer (b1):
• a halogenated olefin;
• and
• monomer (b2):
• a monomer having no polyfluoroalkyl group and having a crosslinkable functional group.