Curable composition

1. A curable composition comprising:

a fluorine-containing silane compound having two or more Si atoms each bonding to at least one group selected from the group consisting of a hydroxyl group, —OR, —OCOR, —O—N═CR 2 , —NR 2 , —NHR and halogen, wherein R is a substituted or unsubstituted C 1-4 alkyl group;

an organosilicon compound having at least two —O—R g3 (s) each bonding to a Si atom, wherein each R g3 , at each occurrence, is as defined below;

a catalyst; and

a solvent; and

the organosilicon compound is contained in an amount of 0.1 parts by mass or more and 30 parts by mass or less based on 100 parts by mass of the fluorine-containing silane compound; wherein

the fluorine-containing silane compound is at least one perfluoropolyether group-containing silane compound represented by formula (A), (C) or (D):

each PFPE, at each occurrence, is independently 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, d, e and f are each independently an integer of 0 or more and 200 or less, the sum of a, b, c, d, e and f is at least 1, the occurrence order of the repeating units in parentheses with a, b, c, d, e or f is not limited in the formula, and each X 10 , at each occurrence, is independently a hydrogen atom, a fluorine atom or a chlorine atom;

each R 13 , at each occurrence, independently represents a hydroxyl group, —OR, —OCOR, —O—N═CR 2 , —NR 2 , —NHR or halogen, wherein R is a substituted or unsubstituted C 1-4 alkyl group;

each R 14 , at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 22 carbon atoms;

each R 11 , at each occurrence, independently represents a hydrogen atom or a halogen atom;

each R 12 , at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms;

R 11″ , R 12″ , R 13″ and R 14″ have the same meanings as R 11 , R 12 , R 13 and R 14 , respectively;

n1 with respect to each (—SiR 13 n1 R 14 3-n1 ) unit or each (—SiR 13″ n1 R 14″ 3-n1 ) unit is independently an integer of 1 to 3;

each X 1 , at each occurrence, independently represents a single bond or a di- to decavalent organic group;

each X 2 , at each occurrence, independently represents a single bond or a divalent organic group;

each t, at each occurrence, is independently an integer of 2 to 10;

each α1, at each occurrence, is independently an integer of 1 to 9;

each X 5 , at each occurrence, independently represents a single bond or a di- to decavalent organic group;

each γ1, at each occurrence, is independently an integer of 1 to 9;

each R a , at each occurrence, independently represents —Z 3 —SiR 71 p1 R 72 q1 R 73 r1 ;

each Z 3 , at each occurrence, independently represents an oxygen atom or a divalent organic group;

each R 71 , at each occurrence, independently represents R a′ ;

R a′ has the same meanings as R a ;

the number of Si linearly bonded via a Z 3 group in R a is at most 5;

each R 72 , at each occurrence, independently represents a hydroxyl group, —OR, —OCOR, —O—N═CR 2 , —NR 2 , —NHR or halogen, wherein R is a substituted or unsubstituted C 1-4 alkyl group;

each R 73 , at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms;

each p1, at each occurrence, is independently an integer of 0 to 1;

each q1, at each occurrence, is independently an integer of 2 to 3;

each r1, at each occurrence, is independently an integer of 0 to 1;

each R a″ , at each occurrence, independently represents —Z 3 —SiR 71 p1 R 72″ q1 R 73 r1 ;

R 72″ has the same meanings as R 72 ;

provided that the sum of p1, q1 and r1 with respect to (—Z 3 —SiR 71 p1 R 72″ q1 R 73 r1 ) or (—Z 3 —SiR 71 p1 R 72″ q1 R 73 r1 ) is 3;

each R b , at each occurrence, independently represents a hydroxyl group, —OR, —OCOR, —O—N═CR 2 , —NR 2 , —NHR or halogen, wherein R is a substituted or unsubstituted C 1-4 alkyl group;

each R c , at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms;

R b″ and R c″ have the same meanings as R b and R c , respectively;

each k1, at each occurrence, is independently an integer of 2 to 3;

each l1, at each occurrence, is independently an integer of 0 to 1;

each m1, at each occurrence, is independently an integer of 0 to 1;

provided that the sum of k1, l1 and m1 with respect to (SiR a k1 R b l1 R c m1 ) or (SiR a″ k1 R b″ l1 R c″ m1 ) is 3;

at least two groups selected from the group consisting of R b , R b″ , R 72 and R 72″ are present in formula (C);

each X 7 independently represents a single bond or a di- to decavalent organic group;

each δ1 is independently an integer of 1 to 9;

each R d , at each occurrence, independently represents —Z 4 —CR 81 p2 R 82 q2 R 83 r2 ;

each Z 4 , at each occurrence, independently represents an oxygen atom or a divalent organic group;

each R 81 , at each occurrence, independently represents R d′ ;

R d′ has the same meanings as R d ;

the number of C linearly linked via a Z 4 group in R d is at most 5;

each R 82 , at each occurrence, independently represents —Y—SiR 85 n2 R 86 3-n2 ;

each Y, at each occurrence, independently represents a divalent organic group;

each R 85 , at each occurrence, independently represents a hydroxyl group, —OR, —OCOR, —O—N═CR 2 , —NR 2 , —NHR or halogen, wherein R is a substituted or unsubstituted C 1-4 alkyl group

each R 86 , at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms;

each R 83 , at each occurrence, independently represents a hydrogen atom, a hydroxyl group or an alkyl group having 1 to 20 carbon atoms;

each p2, at each occurrence, is independently an integer of 0 to 3;

each q2, at each occurrence, is independently an integer of 0 to 3;

each r2, at each occurrence, is independently an integer of 0 to 3;

each R d″ , at each occurrence, independently represents —Z 4 —CR 81 p2 R 82 q2 R 83 r2 ;

R 82″ represents —Y—SiR 85″ n2 R 86″ 3-n2 ;

provided that the sum of p2, q2 and r2 with respect to (—Z 4 —CR 81 p2 R 82 q2 R 83 r2 ) or with respect to (—Z 4 —CR 81 p2 R 82″ q2 R 83 r2 ) is 3;

n2 with respect to a (—Y—SiR 85 n2 R 86 3-n2 ) unit or a (—Y—SiR 85″ n2 R 86″ 3-n2 ) unit independently represents an integer of 1 to 3;

R 85″ and R 86″ have the same meanings as R 85 and R 86 , respectively;

each R e , at each occurrence, independently represents —Y—SiR 85 n2 R 86 3-n2 ;

each R e″ , at each occurrence, independently represents —Y—SiR 85″ n2 R 86″ 3-n2 ;

each R f , at each occurrence, independently represents a hydrogen atom, a hydroxyl group or an alkyl group having 1 to 20 carbon atoms;

R f″ has the same meanings as R f ;

each k2, at each occurrence, is independently an integer of 0 to 1;

each l2, at each occurrence, is independently an integer of 2 to 3; and

each m2, at each occurrence, is independently an integer of 0 to 1;

provided that the sum of k2, l2 and m2 with respect to (CR d k2 R e l2 R f m2 ) or with respect to (CR d″ k2 R e″ l2 R f″ m2 ) is 3;

the organosilicon compound is represented by the following formula (E1), (E2), (E3), (E4) or (E5):

or the organosilicon compound selected from the group consisting of tetraethoxysilane, methyltriethoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, aminopropyltriethoxysilane, aminopropyltrimethoxysilane, tridecafluoro-n-octyltriethoxysilane and tridecafluoro-n-octyltrimethoxysilane;

each R g1 , at each occurrence, is independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms;

each R g2 , at each occurrence, independently represents a substituted or unsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms;

each R g3 , at each occurrence, independently represents a hydrogen atom, CH 3 —, C 2 H 5 —, C 3 H 7 —, CF 3 CH 2 —, CH 3 CO—, CH 2 ═C(CH 3 )—, CH 3 CH 2 C(CH 3 )═N—, (CH 3 ) 2 N—, (C 2 H 5 ) 2 N—, CH 2 ═C(OC 2 H 5 )—, (CH 3 ) 2 C═C(OC 8 H 17 )—, or

each R 4 , at each occurrence, is independently a monovalent organic group;

each R g6 —, at each occurrence, is independently R g8 —R g7 —;

each R g7 , at each occurrence, independently represents a single bond, an oxygen atom or a divalent organic group;

each R g8 is a reactive functional group;

each ε1, at each occurrence, is independently an integer of 1 or more and 50 or less;

each ε2, at each occurrence, is independently 2 or 3;

each ε3, at each occurrence, is independently 2 or 3;

ε4 is an integer of 2 or more;

ε5 is an integer of 0 or more;

ε6 is 1 or 2;

provided that the sum of ε4, ε5 and ε6 is 4; and

the catalyst is a metal-based catalyst having —O—R h as a ligand; and

R h is a C 1-4 alkyl group.

2. The curable composition according to claim 1 , comprising 1 to 300 parts by mass of the solvent based on 100 parts by mass of a total amount of the fluorine-containing silane compound, the organosilicon compound and the catalyst.

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

4. The curable composition according to claim 1 , wherein the catalyst comprises a titanium atom, a zirconium atom or a tin atom.

5. The curable composition according to claim 1 , wherein the catalyst is at least one selected from the group consisting of tetrabutyl titanate, tetrapropyl titanate, tetrapropyl zirconate, tetra-n-butyl zirconate, tetra-n-propyl zirconate, and dibutyltin dimethoxide.