Patent ID: 8822561

Claim:
A curable composition comprising: a fluorinated polyarylene prepolymer (A) having a crosslinkable functional group; a compound (B) having a number average molecular weight of from 140 to 5,000, having at least two crosslinkable functional groups and having no fluorine atoms; a copolymer (C) comprising units (c1) and (c2); and a radical polymerization initiator (D), wherein the unit (c1) has no crosslinkable functional groups, and is a unit formed by polymerization of a monomer represented by formula (5): V—(CH 2 ) m —Ar—(Y—Ar) n —X—R 1 —Cf (5) wherein V is a polymerizable group, Ar is an aromatic ring which may have a C 1-15 alkyl group or a halogen atom, R 1 is a single bond or a C 1-15 alkylene group, Cf is a fluoroalkyl group having at most 20 carbon atoms, which may have an etheric oxygen atom between carbon atoms, X is —CH 2 O— or —COO— Y is a single bond, —OCH 2 —, —CH 2 O—, a C 1-4 alkylene group, —O—, —OCH 2 —, —CO—, —SO 2 — or —S—, m is an integer of from 0 to 4, and n is 0 or 1; wherein the unit (c2) has a crosslinkable functional group; and wherein the curable composition comprises from 0.1 to 20 parts by mass of the copolymer (C) based on 100 parts by mass of a total amount of the prepolymer (A) and the compound (B).