Curable composition

1. 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):

CH 2 ═CH—R k1 —PFPE 1 -R k1 —CH═CH 2   (I), wherein

each R k1 , at each occurrence, independently is a single bond, a C 1-20 alkylene group, —(CH 2 ) s′ —X c —, —(CH 2 ) s′ —X c —(CH 2 ) t′ —, —X d —, —X d —(CH 2 ) t′ —, —X f —, a —X f —C 1-20 alkylene group, —X f —(CH 2 ) s′ —X c —, —X f —(CH 2 ) s′ —X c —(CH 2 ) t′ —, —X f —X d —, or —X f —X d —(CH 2 ) t′ —;

s′ is an integer of 1 to 20;

t′ is an integer of 1 to 20;

X c is —O—, —S—, —C(O)O—, —O—CONR 34 —, —Si(R 33 ) 2 —, —(Si(R 33 ) 2 O) m′ —Si(R 33 ) 2 —, —O—(CH 2 ) u′ —(Si(R 33 ) 2 O) m′ —Si(R 33 ) 2 —, —O—(CH 2 ) u′ —Si(R 33 ) 2 —O—Si(R 33 ) 2 —CH 2 CH 2 —Si(R 33 ) 2 —O—Si(R 33 ) 2 —, —O—(CH 2 ) u′ —Si(OCH 3 ) 2 OSi(OCH 3 ) 2 —, —CONR 34 —(CH 2 ) u′ —(Si(R 33 ) 2 O) m′ —Si(R 33 ) 2 —, —CONR 34 —(CH 2 ) u′ —N(R 34 )—, or —CONR 34 -(o-, m- or p-phenylene)-Si(R 33 ) 2 —;

X d is —S—, —C(O)O—, —CONR 34 —(CH 2 ) u′ —(Si(R 33 ) 2 O) m′ —Si(R 33 ) 2 —, —CONR 34 —(CH 2 ) u′ —N(R 34 )—, or —CONR 34 -(o-, m- or p-phenylene)-Si(R 33 ) 2 —;

each R 33 is at each occurrence, independently is a phenyl group, a C 1-6 alkyl group or a C 1-6 alkoxy group;

each R 34 , at each occurrence, independently is a hydrogen atom, a phenyl group, or a C 1-6 alkyl group;

m′ is at each occurrence, is independently an integer of 1 to 100;

u′ is an integer of 1 to 20;

X f is an alkylene group having C 1-6 atoms, and optionally substituted with one or more substituents selected from a fluorine atom, a C 1-3 alkyl group and a C 1-3 fluoroalkyl group;

PFPE 1 is a group represented by formula:

—(OC 6 F 12 ) a —(OC 5 F 10 ) b —(OC 4 F 8 ) c —(OC 3 X 10 6 ) d —(OC 2 F 4 ) e —(OCF 2 ) 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 X 10 , 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.

2. The curable composition according to claim 1 , wherein a hydrogen atom bonding to a silicon atom in (B) the organosilicon compound which has two or more hydrogen atoms each bonding to a silicon atom, in one molecule, is comprised in the range from 0.5 to 5.0 mol based on 1 mol of an alkenyl group in (A) the compound having two or more alkenyl groups and a perfluoro(poly)ether group in one molecule.

3. The curable composition according to claim 1 , wherein (B) the organosilicon compound which has two or more hydrogen atoms each bonding to a silicon atom, in one molecule, has at least one selected from the group consisting of one or more monovalent perfluoroalkyl groups, monovalent perfluorooxyalkyl groups, divalent perfluoroalkylene groups and divalent perfluorooxyalkylene groups, in a molecular structure.

4. The curable composition according to claim 1 , wherein the catalyst is a transition metal catalyst.

5. The curable composition according to claim 1 , wherein the catalyst comprises at least one comprising platinum, rhodium, ruthenium, iridium and palladium.

6. The curable composition according to claim 1 , wherein the catalyst comprises platinum.

7. The curable composition according to claim 1 , comprising 0.1 to 500 ppm by mass of the catalyst in terms of metal atom relative to (A) the compound having two or more alkenyl groups and a perfluoro(poly)ether group in one molecule.

8. The curable composition according to claim 1 , wherein a ratio of the sum of e and f to the sum of a, b, c, d, e and f is 0.80 or more in (A) the compound having two or more alkenyl groups and a perfluoro(poly)ether group in one molecule.

9. The curable composition according to claim 1 , wherein X 10 is a fluorine atom.