Patent ID: 7335698

Claim:
An ethylenically unsaturated group-containing fluoropolymer, which is obtained by reacting a compound containing one isocyanate group and at least one ethylenically unsaturated group, and a hydroxyl group-containing fluoropolymer at an isocyanate group/hydroxyl group molar ratio of 1.1 to 1.9, wherein the hydroxyl group containing fluoropolymer contains 20 to 70% by mole of the following structural unit (a), 10 to 70% by mole of the following structural unit (b), 5 to 70% by mole of the following structural unit (c) and 0.1 to 10% by mole of the following structural unit (d) and has a number average molecular weight of 5,000 to 500,000 in terms of polystyrene as measured by gel permeation chromatography: (a) a structural unit represents by general formula (1); (b) a structural unit represents by general formula (2); (c) a structural unit represents by general formula (3); (d) a structural unit derived from an azo group-containing polysiloxane compound and represented by the following general formula (4); wherein, in the general formula (1), R 1 represents a fluorine atom, fluoroalkyl group or group represented as —OR 2 (R 2 represents an alkyl group or fluoroalkyl group); wherein, in the general formula (2), R 3 represents a hydrogen atom or methyl group, R 4 represents an alkyl group, group represented as —(CH 2 ) x —OR 5 or —OCOR 5 (R 5 represents an alkyl group or glycidyl group, and x represents a number of 0 or 1), carboxyl group or alkoxycarbonyl group; wherein, in the general formula (3), R 6 represents a hydrogen atom or methyl group, R 7 represents a hydrogen atom or hydroxyalkyl group, and v represents a number of 0 or 1; wherein, in the general formula (4), R 8 and R 9 may be identical or different and represent a hydrogen atom, alkyl group, halogenated alkyl group or aryl group.