Curable composition

Abstract

A curable composition including a perfluoro(poly)ether group-containing silane compound having two or more Si atoms each bonding to at least one of a hydroxyl and hydrolyzable group, and a perfluoro(poly)ether group represented by: —(OC.sub.6F.sub.12).sub.a—(OC.sub.5F.sub.10).sub.b—(OC.sub.4F.sub.8).sub.c—(OC.sub.3X.sup.10.sub.6).sub.d—(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—, wherein a, b, c and d are each independently an integer of 0 to 30, e and f are each independently an integer of 1 to 200, the sum of a, b, c, d, e and f is at least 5, the occurrence order of respective repeating units with the subscript a, b, c, d, e or f is not limited, a ratio of e to f is less than 1.0, and each X.sup.10 is independently a hydrogen, fluorine or chlorine atom; an organosilicon compound having at least two —O—R.sup.g3(s) each bonding to a Si atom, wherein each R.sup.g3 is independently a hydrogen atom or a monovalent organic group; and a catalyst.

Claims

1. A curable composition comprising: a perfluoro(poly)ether group-containing silane compound which is a compound having two or more Si atoms each bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group, and a perfluoro(poly)ether group, wherein the perfluoro(poly)ether group is a group represented by formula:
—(OC.sub.6F.sub.12).sub.a—(OC.sub.5F.sub.10).sub.b—(OC.sub.4F.sub.8).sub.c—(OC.sub.3X.sup.10.sub.6).sub.d—(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.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 less than 1.0, and each X.sup.10, at each occurrence, is independently a hydrogen atom, a fluorine atom or a chlorine atom, and the Si atom bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group is contained at each end of a molecular backbone of the perfluoro(poly)ether group-containing silane compound; an organosilicon compound having at least two —O—R.sup.g3(s) each bonding to a Si atom, wherein each R.sup.g3, at each occurrence, is independently a hydrogen atom or a monovalent organic group; and a catalyst, wherein the composition comprises 0.1 to 30 parts by mass of the organosilicon compound based on 100 parts by mass of the perfluoro(poly)ether group-containing silane compound; the organosilicon compound is represented by any of the following formulae (E1) to (E5): ##STR00024## wherein: each R.sup.g1, at each occurrence, is independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms; each R.sup.g2, at each occurrence, is independently substituted or unsubstituted and has 1 to 20 carbon atoms; each R.sup.g3 is as defined above; each R.sup.g4, at each occurrence, is independently a monovalent organic group; R.sup.g6 represents R.sup.g8—R.sup.g7—; each R.sup.g7, at each occurrence, independently represents a single bond, an oxygen atom or a divalent organic group; each R.sup.g8, at each occurrence, is independently an amino group, an epoxy group, a methacrylic group, a vinyl group or a mercapto group; each ε1, at each occurrence, is independently an integer of 1 or more; each ε2, at 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 or 0 or more; and ε6 is 1 or 2; or the organosilicon compound is selected from the group consisting of tetraethoxysilane, tetratrimethoxysilane, methyltriethoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, aminopropyltriethoxysilane, aminopropyltrimethoxysilane, tridecafluoro-n-octyltriethoxysilane and tridecafluoro-n-octyltrimethoxysilane.

2. The curable composition according to claim 1, wherein the perfluoro(poly)ether group-containing silane compound is at least one perfluoro(poly)ether group-containing silane compound represented by formula (A), (B), (C) or (D): ##STR00025## wherein: each PFPE.sup.1, at each occurrence, is independently a group represented by formula:
—(OC.sub.6F.sub.12).sub.a—(OC.sub.5F.sub.10).sub.b—(OC.sub.4F.sub.8).sub.c—(OC.sub.3X.sup.10.sub.6).sub.d—(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.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 less than 1.0, and each X.sup.10, at each occurrence, is independently a hydrogen atom, a fluorine atom or a chlorine atom; each R.sup.13, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.14, at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 22 carbon atoms; each R.sup.11, at each occurrence, independently represents a hydrogen atom or a halogen atom; each R.sup.12, at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms; R.sup.11″, R.sup.12″, R.sup.13″ and R.sup.14″ have the same meanings as R.sup.11, R.sup.12, R.sup.13 and R.sup.14, respectively; n1 with respect to each (—SiR.sup.13.sub.n1R.sup.14.sub.3−n1) unit or each (—SiR.sup.13″.sub.n1R.sup.14″.sub.3−n1) unit is independently an integer of 0 to 3; provided that at least two groups selected from the group consisting of R.sup.13 and R.sup.13″, at each occurrence, are each independently present in formulae (A) and (B); each X.sup.1, at each occurrence, independently represents a single bond or a di- to decavalent organic group; each X.sup.2, at each occurrence, independently represents a single bond or a divalent organic group; each t, at each occurrence, is independently an integer of 1 to 10; each α1, at each occurrence, is independently an integer of 1 to 9; each X.sup.3, at each occurrence, independently represents a single bond or a di- to decavalent organic group; each β1, at each occurrence, is independently an integer of 1 to 9; each X.sup.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.sup.a, at each occurrence, independently represents —Z.sup.3—SiR.sup.71.sub.p1R.sup.72.sub.q1R.sup.73.sub.r1; each Z.sup.3, at each occurrence, independently represents an oxygen atom or a divalent organic group; each R.sup.71, at each occurrence, independently represents R.sup.a′; R.sup.a′ has the same meanings as R.sup.a; the number of Si linearly linked via a Z.sup.3 group in R.sup.a is at most 5; each R.sup.72, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.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 3; each q1, at each occurrence, is independently an integer of 0 to 3; each r1, at each occurrence, is independently an integer of 0 to 3; each R.sup.a″, at each occurrence, independently represents —Z.sup.3—SiR.sup.71.sub.p1R.sup.72″.sub.q1R.sup.73.sub.r1; R.sup.72″ has the same meanings as R.sup.72; provided that the sum of p1, q1 and r1 with respect to (—Z.sup.3—SiR.sup.71.sub.p1R.sup.72.sub.q1R.sup.73.sub.r1) or (—Z.sup.3—SiR.sup.71.sub.p1R.sup.72″.sub.q1R.sup.73.sub.r1) is 3 and at least one q1 in formula (C) is an integer of 1 to 3; each R.sup.b, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.c, at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms; R.sup.b″ and R.sup.c″ have the same meanings as R.sup.b and R.sup.c, respectively; each k1, at each occurrence, is independently an integer of 0 to 3; each l1, at each occurrence, is independently an integer of 0 to 3; each m1, at each occurrence, is independently an integer of 0 to 3; provided that the sum of k1, l1 and m1 with respect to each (SiR.sup.a.sub.k1R.sup.b.sub.l1R.sup.c.sub.m1) or each (SiR.sup.a″.sub.k1R.sup.b″.sub.l1R.sup.c″.sub.m1) is 3; at least two groups selected from the group consisting of R.sup.b, R.sup.b″, R.sup.72 and R.sup.72″ are present in (C); each X.sup.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.sup.d, at each occurrence, independently represents —Z.sup.4—CR.sup.81.sub.p2R.sup.82.sub.q2R.sup.83.sub.r2; each Z.sup.4, at each occurrence, independently represents an oxygen atom or a divalent organic group; each R.sup.81, at each occurrence, independently represents R.sup.d; R.sup.d′ has the same meanings as R.sup.d; the number of C linearly linked via a Z.sup.4 group in R.sup.d is at most 5; each R.sup.82, at each occurrence, independently represents —Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2; each Y, at each occurrence, independently represents a divalent organic group; each R.sup.85, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.86, at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms; each R.sup.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.sup.d″, at each occurrence, independently represents —Z.sup.4—CR.sup.81.sub.p2R.sup.82″.sub.q2R.sup.83.sub.r2; R.sup.82″ represents —Y—SiR.sup.85″.sub.n2R.sup.86″.sub.3−n2; provided that the sum of p2, q2 and r2 with respect to (—Z.sup.4—CR.sup.81.sub.p2R.sup.82.sub.q2R.sup.83.sub.r2) or (—Z.sup.4—CR.sup.81.sub.p2R.sup.82″.sub.q2R.sup.83.sub.r2) is 3; n2 with respect to a (—Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2) unit or a (—Y—SiR.sup.85″.sub.n2R.sup.86″.sub.3−n2) unit independently represents an integer of 0 to 3; R.sup.85″ and R.sup.86″ have the same meanings as R.sup.85 and R.sup.86, respectively; each R.sup.e, at each occurrence, independently represents —Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2; each R.sup.e″, at each occurrence, independently represents —Y—SiR.sup.85″.sub.n2R.sup.86″.sub.3−n2; each R.sup.f, at each occurrence, independently represents a hydrogen atom, a hydroxyl group or an alkyl group having 1 to 20 carbon atoms; R.sup.f″ has the same meanings as R.sup.f; each k2, at each occurrence, is independently an integer of 0 to 3; each 12, at each occurrence, is independently an integer of 0 to 3; and each m2, at each occurrence, is independently an integer of 0 to 3; provided that the sum of k2, l2 and m2 with respect to (CR.sup.d.sub.k2R.sup.e.sub.12R.sup.f.sub.m2) or (CR.sup.d″.sub.k2R.sup.e″.sub.l2R.sup.f″.sub.m2) is 3, and two or more groups selected from the group consisting of a group represented by —Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2 wherein n2 is 1 or more and a group represented by —Y—SiR.sup.85″.sub.n2R.sup.86″.sub.3−n2 wherein n2 is 1 or more are present in formula (D).

3. The curable composition according to claim 1, wherein the catalyst is at least one selected from the group consisting of a metal-based catalyst, an organic acid-based catalyst, an inorganic acid-based catalyst and a basic catalyst.

4. The curable composition according to claim 1, wherein the catalyst is a metal-based catalyst comprising a titanium atom, a zirconium atom or a tin atom.

5. The curable composition according to claim 1, comprising 0.1 to 5.0 parts by mass of the catalyst based on 100 parts by mass of the perfluoro(poly)ether group-containing silane compound.

6. 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.

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

Description

EXAMPLES

(1) The present invention is more specifically described with reference to the following Examples, but is not intended to be limited to such Examples. The occurrence order of repeating units constituting perfluoro(poly)ether is not limited in the present Examples.

Example 1

(2) Preparation of Curable Composition

(3) Perfluoropolyether compound (A), tetraethoxysilane as a cross-linking agent, and tetraisopropaxy titanium as a curing catalyst were weighed in a glass vessel for mixing in amounts of 100 parts by weight, 1 part by weight, and 0.5 parts by weight, respectively, and stirred with a magnetic stirrer, to prepare a curable composition.

(4) Perfluoropolyether Compound (A)

(5) (C.sub.2H.sub.5O).sub.3SiCH.sub.2CH.sub.2CH.sub.2NHCOCF.sub.2(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—CF.sub.2CONHCH.sub.2CH.sub.2CH.sub.2Si(OC.sub.2H.sub.5).sub.3

(6) wherein e=40, f=58, and e/f=0.7

Example 2

(7) A curable composition was prepared in the same manner as in Example 1 except that the following perfluoropolyether compound (B) was used instead of perfluoropolyether compound (A).

(8) Perfluoropolyether Compound (B)

(9) H(((C.sub.2H.sub.5O).sub.3Si)CHCH.sub.2).sub.3CF.sub.2(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—CF.sub.2(CH.sub.2CH(Si(OC.sub.2H.sub.5).sub.3)).sub.3H

(10) wherein e=40, f=58, and e/f=0.7

Comparative Example 1

(11) A curable composition was prepared in the same manner as in Example 1 except that the following perfluoropolyether compound (C) was used instead of perfluoropolyether compound (A).

(12) Perfluoropolyether Compound (C)

(13) (C.sub.2H.sub.5O).sub.3SiCH.sub.2CH.sub.2CH.sub.2NHCOCF.sub.2(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—CF.sub.2CONHCH.sub.2CH.sub.2CH.sub.2Si(OC.sub.2H.sub.5).sub.3

(14) wherein e=48, f=37, and e/f=1.3

Comparative Example 2

(15) A curable composition was prepared in the same manner as in Example 1 except that the following perfluoropolyether compound (D) was used instead of perfluoropolyether compound (A).

(16) Perfluoropolyether Compound (D)

(17) (C.sub.2H.sub.5O).sub.3SiCH.sub.2CH.sub.2CH.sub.2NHCOCF.sub.2(OCF.sub.2CF(CF.sub.3)).sub.mOCF.sub.2CF.sub.2O(CF(CF.sub.3)CF.sub.2O).sub.n—CF.sub.2CONHCH.sub.2CH.sub.2CH.sub.2Si(OC.sub.2H.sub.5).sub.3

(18) wherein m+n=54

(19) Preparing a Test Sample

(20) The curable composition prepared in Example or Comparative Example was poured into a mold produced by polytetrafluoroethylene (PTFE), and left to still stand at room temperature for 24 hours and thus cured, to produce a test piece of 5 mm×200 mm, having a thickness of 0.2 mm.

(21) Evaluation of Dynamic Viscoelasticity

(22) Each of the test pieces obtained thereof was subjected to dynamic viscoelasticity measurement with a tension-type viscoelasticity measuring system (DMA). Liquid nitrogen was used for cooling and the measurement was performed at a frequency of 10 Hz and at a temperature-increasing rate of 2° C./min in the measurement temperature range from −140 to 50° C. The resulting storage elastic modulus was used to calculate the ratio of the elastic modulus at −50° C. to the storage elastic modulus at 0° C. (Elastic modulus at −50° C./Elastic modulus at 0° C.). The resulting storage elastic modulus plot was used to calculate the glass transition temperature (Tg).

(23) In Table 1, Tg and the “Elastic modulus ratio” (Elastic modulus at −50° C./Elastic modulus at 0° C.) are shown.

(24) TABLE-US-00001 TABLE 1 Tg (° C.) Elastic modulus ratio Example 1 −125 1.2 Example 2 −121 1.5 Comparative Example 1 −105 2.1 Comparative Example 2 −71 4.2

INDUSTRIAL APPLICABILITY

(25) The present invention can be suitably utilized for forming a fluorine-containing sealing material for embedding any void (for example, a void at a display edge) of a display or between electronic members such as a printed board in electronic equipment. The present invention can be suitably used in an application where it is used at a relatively low temperature, for example, an automobile member (for example, a sealing material, specifically, a gasket), particularly, an automobile member usable in a cool region (for example, −50° C. or less).

(26) The present invention includes following embodiments:

Embodiment 1

(27) A curable composition comprising:

(28) a perfluoro(poly)ether group-containing silane compound which is a compound having two or more Si atoms each bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group, and a perfluoro(poly)ether group, wherein

(29) the perfluoro(poly)ether group is a group represented by formula:
—(OC.sub.6F.sub.12).sub.a—(OC.sub.5F.sub.10).sub.b—(OC.sub.4F.sub.8).sub.c—(OC.sub.3X.sup.10.sub.6).sub.d—(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—

(30) 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 less than 1.0, and each X.sup.10, at each occurrence, is independently a hydrogen atom, a fluorine atom or a chlorine atom; an organosilicon compound having at least two —O—R.sup.g3(s) each bonding to a Si atom, wherein each R.sup.g3, at each occurrence, is independently a hydrogen atom or a monovalent organic group; and a catalyst.

Embodiment 2

(31) The curable composition according to Embodiment 1, wherein the perfluoro(poly)ether group-containing silane compound is at least one perfluoro(poly)ether group-containing silane compound represented by formula (A), (B), (C) or (D):

(32) ##STR00022##

(33) wherein: each PFPE.sup.1, at each occurrence, is independently a group represented by formula:
—(OC.sub.6F.sub.12).sub.a—(OC.sub.5F.sub.10).sub.b—(OC.sub.4F.sub.8).sub.c—(OC.sub.3X.sup.10.sub.6).sub.d—(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—

(34) 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 less than 1.0, and each X.sup.10, at each occurrence, is independently a hydrogen atom, a fluorine atom or a chlorine atom; each R.sup.13, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.14, at each occurrence, independently represents a hydrogen atom or an alkyl group having 1 to 22 carbon atoms; each R.sup.11, at each occurrence, independently represents a hydrogen atom or a halogen atom; each R.sup.12, at each occurrence, independently represents a hydrogen atom or a lower alkyl group; R.sup.11″, R.sup.12″, R.sup.13″ and R.sup.14″ have the same meanings as R.sub.11, R.sup.12, R.sup.13 and R.sup.14, respectively; n1 with respect to each (—SiR.sup.13.sub.n1R.sup.14.sub.3−n1) unit or each (—SiR.sup.13″.sub.n1R.sup.14″.sub.3−n1) unit is independently an integer of 0 to 3; provided that at least two groups selected from the group consisting of R.sup.13 and R.sup.13″, at each occurrence, are each independently present in formulae (A) and (B); each X.sup.1, at each occurrence, independently represents a single bond or a di- to decavalent organic group; each X.sup.2, at each occurrence, independently represents a single bond or a divalent organic group; each t, at each occurrence, is independently an integer of 1 to 10; each α1, at each occurrence, is independently an integer of 1 to 9; each X.sup.3, at each occurrence, independently represents a single bond or a di- to decavalent organic group; each β1, at each occurrence, is independently an integer of 1 to 9; each X.sup.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.sup.a, at each occurrence, independently represents —Z.sup.3—SiR.sup.71.sub.p1R.sup.72.sub.q1R.sup.73.sub.r1; each Z.sup.3, at each occurrence, independently represents an oxygen atom or a divalent organic group; each R.sup.71, at each occurrence, independently represents R.sup.a′; R.sup.a′ has the same meanings as R.sup.a; the number of Si linearly linked via a Z.sup.3 group in R.sup.a is at most 5; each R.sup.72, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.73, at each occurrence, independently represents a hydrogen atom or a lower alkyl group; each p1, at each occurrence, is independently an integer of 0 to 3; each q1, at each occurrence, is independently an integer of 0 to 3; each r1, at each occurrence, is independently an integer of 0 to 3; each R.sup.a″, at each occurrence, independently represents —Z.sup.3—SiR.sup.71.sub.p1R.sup.72″.sub.q1R.sup.73.sub.r1; R.sup.72″ has the same meanings as R.sup.72; provided that the sum of p1, q1 and r1 with respect to (—Z.sup.3—SiR.sup.71.sub.p1R.sup.72.sub.q1R.sup.73.sub.r1) or (—Z.sup.3—SiR.sup.71.sub.p1R.sup.72″.sub.q1R.sup.73.sub.r1) is 3 and at least one q1 in formula (C) is an integer of 1 to 3; each R.sup.b, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.c, at each occurrence, independently represents a hydrogen atom or a lower alkyl group; R.sup.b″ and R.sup.c″ have the same meanings as R.sup.b and R.sup.c, respectively; each k1, at each occurrence, is independently an integer of 0 to 3; each 11, at each occurrence, is independently an integer of 0 to 3; each m1, at each occurrence, is independently an integer of 0 to 3; provided that the sum of k1, l1 and m1 with respect to each (SiR.sup.a.sub.k1R.sup.b.sub.l1R.sup.c.sub.m1) or each (SiR.sup.a″.sub.k1R.sup.b″.sub.l1R.sup.c″.sub.m1) is 3; at least two groups selected from the group consisting of R.sup.b, R.sup.b″, R.sup.72 and R.sup.72″ are present in (C); each X.sup.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.sup.d, at each occurrence, independently represents —Z.sup.4—CR.sup.81.sub.p2R.sup.82.sub.q2R.sup.83.sub.r2; each Z.sup.4, at each occurrence, independently represents an oxygen atom or a divalent organic group; each R.sup.81, at each occurrence, independently represents R.sup.d′; R.sup.d′ has the same meanings as R.sup.d; the number of C linearly linked via a Z.sup.4 group in R.sup.d is at most 5; each R.sup.82, at each occurrence, independently represents —Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2; each Y, at each occurrence, independently represents a divalent organic group; each R.sup.85, at each occurrence, independently represents a hydroxyl group or a hydrolyzable group; each R.sup.86, at each occurrence, independently represents a hydrogen atom or a lower alkyl group; each R.sup.83, at each occurrence, independently represents a hydrogen atom, a hydroxyl group, or a lower alkyl group; 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.sup.d″, at each occurrence, independently represents —Z.sup.4—CR.sup.81.sub.p2R.sup.82″.sub.q2R.sup.83.sub.r2; R.sup.82″ represents —Y—SiR.sup.85″.sub.n2R.sup.86″.sub.3−n2, provided that the sum of p2, q2 and r2 with respect to (—Z.sup.4—CR.sup.81.sub.p2R.sup.82.sub.q2R.sup.83.sub.r2) or (—Z.sup.4—CR.sup.81.sub.p2R.sup.82″.sub.q2R.sup.83.sub.r2) is 3; n2 with respect to a (—Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2) unit or a (—Y—SiR.sup.85″.sub.n2R.sup.86″.sub.3−n2) unit independently represents an integer of 0 to 3; R.sup.85″ and R.sup.86″ have the same meanings as R.sup.85 and R.sup.86, respectively; each R.sup.e, at each occurrence, independently represents —Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2; each R.sup.e″, at each occurrence, independently represents —Y—SiR.sup.85″.sub.n2R.sup.86.sub.3−n2, each R.sup.f, at each occurrence, independently represents a hydrogen atom, a hydroxyl group or a lower alkyl group; R.sup.f″ has the same meanings as R.sup.f; each k2, at each occurrence, is independently an integer of 0 to 3; each 12, at each occurrence, is independently an integer of 0 to 3; and each m2, at each occurrence, is independently an integer of 0 to 3; provided that the sum of k2, l2 and m2 with respect to (CR.sup.d.sub.k2R.sup.e.sub.l2R.sup.f.sub.m2) or (CR.sup.d″.sub.k2R.sup.e″.sub.12R.sup.f″.sub.m2) is 3, and two or more groups selected from the group consisting of a group represented by —Y—SiR.sup.85.sub.n2R.sup.86.sub.3−n2 wherein n2 is 1 or more and a group represented by —Y—SiR.sup.85″n2R.sup.86″3-n2 wherein n2 is 1 or more are present in formula (D).

Embodiment 3

(35) The curable composition according to Embodiment 1 or 2, wherein such a Si atom bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group is present at each of both ends of a molecular backbone of the perfluoro(poly)ether group-containing silane compound.

Embodiment 4

(36) The curable composition according to any one of Embodiments 1 to 3, wherein the catalyst is at least one selected from the group consisting of a metal-based catalyst, an organic acid-based catalyst, an inorganic acid-based catalyst and a basic catalyst.

Embodiment 5

(37) The curable composition according to any one of Embodiments 1 to 4, wherein the catalyst is a metal-based catalyst comprising a titanium atom, a zirconium atom or a tin atom.

Embodiment 6

(38) The curable composition according to any one of Embodiments 1 to 5, comprising 0.1 to 5.0 parts by mass of the catalyst based on 100 parts by mass of the perfluoro(poly)ether group-containing silane compound.

Embodiment 7

(39) The curable composition according to any one of Embodiments 1 to 6, wherein the organosilicon compound comprises an organosilicon compound represented by any of the following formulae (E1) to (E5):

(40) ##STR00023##

(41) wherein: each R.sup.g1, at each occurrence, is independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms; each R.sup.g2, at each occurrence, is independently substituted or unsubstituted and has 1 to 20 carbon atoms; each R.sup.g3, at each occurrence, is independently a hydrogen atom or a monovalent organic group; each R.sup.g4, at each occurrence, is independently a monovalent organic group; R.sup.g6 represents R.sup.g8-R.sup.g7—; each R.sup.g7, at each occurrence, independently represents a single bond, an oxygen atom or a divalent organic group; each R.sup.g8, at each occurrence, is independently an amino group, an epoxy group, a methacrylic group, a vinyl group or a mercapto group; each ε1, at each occurrence, is independently an integer of 1 or more; each ε2, at 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 1 or 2; and ε6 is an integer of 0 or more.

Embodiment 8

(42) The curable composition according to any one of Embodiments 1 to 7, comprising 0.1 to 30 parts by mass of the organosilicon compound based on 100 parts by mass of the perfluoro(poly)ether group-containing silane compound.

Embodiment 9

(43) The curable composition according to any one of Embodiments 1 to 8, 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.

Embodiment 10

(44) The curable composition according to any one of Embodiments 1 to 9, wherein X.sup.10 is a fluorine atom.