Claims
- 1. An electrically insulating paint composition which comprises (A) an alkenyl group-containing organopolysiloxane free from silanol groups which is a copolymer consisting essentially of three kinds of siloxane units represented by the same general formula (R.sup.1).sub.a SiO.sub.(4-a)/2, monofunctional siloxane units (M) of the formula R.sub.3.sup.1 SiO.sub.0.5 (a=3), quadrifunctional siloxane units (Q) of the formula SiO.sub.2 (a=0) and trifunctional siloxane units (T) of the formula R.sup.1 SiO.sub.1.5 (a=1) with no difunctional siloxane units R.sub.2.sup.1 SiO (a=2), said siloxane units (M), (Q), (T) being present in said copolymer in a molar ratio of 0.5-1.3 to 0.6-1.4 to 0.1-0.8, respectively, and wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon residue, said copolymer containing at least two alkenyl groups in a molecule, and the proportion of alkenyl groups range from 5-30 mol % of the total R.sup.1 monovalent hydrocarbon residues in a molecule; (B) an organopolyhydrogen-siloxane which is a homo- or copolymer containing at least one siloxane unit represented by the general formula (R.sup.2).sub.b SiO.sub.(4-b)/2, wherein R.sup.2 represents hydrogen or an unsubstituted or substituted monovalent hydrocarbon residue, and b satisfies a relation 0<b.ltoreq.3, said homo- or copolymer containing at least two hydrogen atoms bonded directly to silicon atoms in a molecule; (C) a catalytic amount of platinum compound; and (D) an inorganic powder material comprising one or more of a metallic oxide and/or a metallic double oxide.
- 2. The electrically insulating paint composition of claim 1, wherein R.sup.1 in the general formula of said component (A), (R.sup.1).sub.a SiO.sub.(4-a)/2, is a monovalent hydrocarbon residue containing up to 6 carbon atoms, which is selected from the group consisting of an alkyl of 1 to 6 carbon atoms, phenyl and alkenyl.
- 3. The electrically insulating paint composition of claim 1, wherein said content of the alkenyl groups in one molecule of the copolymer ranges from 10 to 30 mol %.
- 4. The electrically insulating paint composition of claim 1, wherein at least one of the alkenyl groups contained in one molecule of the copolymer of said component (A) is a vinyl group, .alpha.-methylvinyl group or allyl group.
- 5. The electrically insulating paint composition of claim 1, wherein organic groups, other than alkenyl groups, in said component (A) are methyl.
- 6. The electrically insulating paint composition of claim 4, wherein all of said alkenyl groups, contained in one molecule of the copolymer of the component (A), are vinyl groups.
- 7. The electrically insulating paint composition of claim 1, wherein said component (B) is compounded in such an amount that the number of hydrogen atoms bonded directly to silicon atoms in the component (B) corresponds to from 0.7 to 10 per one alkenyl group in component (A).
- 8. The electrically insulating paint composition of claim 1, wherein a platinum compound of said component (C) is added in a proportion of 1 to 400 parts by weight, based on platinum metal, to 1,000,000 parts by weight of the combination of component (A) with component (B).
- 9. The electrically insulating paint composition of claim 1, which additionally contains a retarder for controlling the speed of the addition reaction between said component (A) and said component (B).
- 10. The electrically insulating paint composition of claim 1, wherein a content of said components (A) and that of said component (B) amount of 5 to 1,000 parts by weight in all per 100 parts by weight of said component (D).
- 11. The electrically insulating paint composition of claim 1, wherein a grain size of said component (D) is 200 microns or less.
- 12. The electrically insulating paint composition of claim 11, wherein said grain size of the component (D) is 100 microns or less.
- 13. A cured product which is obtained by curing the composition of claim 1.
- 14. The electrically insulating paint composition of claim 1, wherein said component (B) is selected from the group consisting of H(R.sup.2).sub.2 SiOSi(R.sup.2).sub.2 H, ##STR4## wherein R.sup.2 is hydrogen or an unsubstituted or substituted monovalent hydrocarbon residue; and
- n, m, and p are rational numbers of 2 or more, 0 or more, and 1 or more, respectively.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-176937 |
Jul 1989 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/549,044, filed Jul. 6, 1990 now abandoned.
US Referenced Citations (14)
Continuations (1)
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Number |
Date |
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Parent |
549044 |
Jul 1990 |
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