Water- and oil-repellent agent composition, method for producing same, and article

A water- and oil-repellent agent composition comprising a fluorine-containing polymer having a unit based on a monomer (a) described below, a unit based on a monomer (b1) described below, a unit based on a monomer (b2) described below, a unit based on a monomer (b3) described below, and a unit based on a monomer (c) described below, wherein

• relative to all units that constitute the fluorine-containing polymer, a proportion of the unit based on the monomer (a) is from 70 to 80% by mass, a proportion of a combination of the unit based on the monomer (b1), the unit based on the monomer (b2) and the unit based on the monomer (b3) is from 12 to 28% by mass, and a proportion of the unit based on the monomer (c) is from 2 to 8% by mass.
• Monomer (a):
• a compound represented by (Z-Q)nX
• wherein Z is a polyfluoroalkyl group of 1 to 6 carbon atoms or a group represented by CjF2j+1O(CFX1CF2O)kCFX2—, j is an integer of 1 to 6, k is an integer of 0 to 10, X1 and X2 each independently represent a fluorine atom or a trifluoromethyl group,
• Q is a divalent organic group or a single bond,
• n represents 1 or 2, and
• when n is 1, X is a group represented by —CR═CH2, —C(O)OCR═CH2, —OC(O)CR═CH2, —OCH2-φ—CR═CH2 or —OCH═CH2, and when n is 2, X is a group represented by —CH[—(CH2)mCR═CH2]—, —CH[—(CH2)mC(O)OCR═CH2]—, —CH[—(CH2)mOC(O)CR═CH2]— or —OC(O)CH═CHC(O)O—, wherein R represents a hydrogen atom, a methyl group or a halogen atom, φ represents a phenylene group, and m is an integer of 0 to 4.
• Monomer (b1):
• a monomer not having a polyfluoroalkyl group, but having an alkyl group of 22 carbon atoms.
• Monomer (b2):
• a monomer not having a polyfluoroalkyl group, but having an alkyl group of 20 carbon atoms.
• Monomer (b3):
• a monomer not having a polyfluoroalkyl group, but having an alkyl group of 18 carbon atoms.
• Monomer (c):
• a halogenated olefin.