Curable composition

A curable composition for filling a void of an electronic member comprising:

• (A) a compound which is a compound having two or more alkenyl groups and a perfluoro(poly)ether group in one molecule is a compound represented by formula (I):
• CH2═CH—Rk1—PFPE1-Rk1—CH═CH2 (I), wherein
• each Rk1, at each occurrence, independently is a single bond, a C1-20 alkylene group, —(CH2)s′—Xc—, —(CH2)s′—Xc—(CH2)t′—, —Xd—, —Xd—(CH2)t′—, —Xf—, a —Xf—C1-20 alkylene group, —Xf—(CH2)s′—Xc—, —Xf—(CH2)s′—Xc—(CH2)t′—, —Xf—Xd—, or —Xf—Xd—(CH2)t′—;
• s′ is an integer of 1 to 20;
• t′ is an integer of 1 to 20;
• Xc is —O—, —S—, —C(O)O—, —O—CONR34—, —Si(R33)2—, —(Si(R33)2O)m′—Si(R33)2—, —O—(CH2)u′—(Si(R33)2O)m′—Si(R33)2—, —O—(CH2)u′—Si(R33)2—O—Si(R33)2—CH2CH2—Si(R33)2—O—Si(R33)2—, —O—(CH2)u′—Si(OCH3)2OSi(OCH3)2—, —CONR34—(CH2)u′—(Si(R33)2O)m′—Si(R33)2—, —CONR34—(CH2)u′—N(R34)—, or —CONR34-(o-, m- or p-phenylene)-Si(R33)2—;
• Xd is —S—, —C(O)O—, —CONR34—(CH2)u′—(Si(R33)2O)m′—Si(R33)2—, —CONR34—(CH2)u′—N(R34)—, or —CONR34-(o-, m- or p-phenylene)-Si(R33)2—;
• each R33 is at each occurrence, independently is a phenyl group, a C1-6 alkyl group or a C1-6 alkoxy group;
• each R34, at each occurrence, independently is a hydrogen atom, a phenyl group, or a C1-6 alkyl group;
• m′ is at each occurrence, is independently an integer of 1 to 100;
• u′ is an integer of 1 to 20;
• Xf is an alkylene group having C1-6 atoms, and optionally substituted with one or more substituents selected from a fluorine atom, a C1-3 alkyl group and a C1-3 fluoroalkyl group;
• PFPE1 is a group represented by formula:
• —(OC6F12)a—(OC5F10)b—(OC4F8)c—(OC3X106)d—(OC2F4)e—(OCF2)f—
• wherein a, b, c and d are each independently an integer of 0 or more and 30 or less, e and f are each independently an integer of 1 or more and 200 or less, the sum of a, b, c, d, e and f is at least 5 or more, the occurrence order of the respective repeating units in parentheses with the subscript a, b, c, d, e or f is not limited in the formula, a ratio of e to f is 1.0 or more and 1.5 or less, and each X10, at each occurrence, is independently a hydrogen atom, a fluorine atom or a chlorine atom;
• (B) an organosilicon compound which has two or more hydrogen atoms each bonding to a silicon atom, in one molecule;
• and
• (C) a catalyst.