US5086107A
Expired / Lapsed
US
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Room temperature-curable organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1990-12-27
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Granted: 1992-02-04
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Expires: 2010-12-27
Abstract
Abstract A room temperature-curable organopolysiloxane composition capable of giving a highly oil-resistant cured silicone rubber is disclosed. The composition comprises, as the essential ingredients, a hydroxy-terminated diorganopolysiloxane, an iminoxysilane compound as a crosslinking agent, an organotin compound as a catalyst and, as an oil-resistance improver, a combination of zinc carbonate and zinc hydroxide in a powdery form of which the content of zinc hydroxide is, different from conventional basic zinc carbonate, 5 to 50% by weight. By virtue of this unique ingredient, the composition is also advantageous in respect of the high storage stability.
Inventors
- 👤 Masatoshi Arai
- 👤 Tsuneo Kimura
- 👤 Yoshio Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/544; C08K5/5465
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A room temperature-curable organopolysiloxane composition which comprises, as a blend: (a) 100 parts by weight of a diorganopolysiloxane having a viscosity in the range from 25 to 500,000 centistokes at 25° C., of which the molecular chain ends are blocked with silanolic hydroxy groups; (b) from 1 to 50 parts by weight of an iminoxysilane compound represented by the general formula R.sup.1.sub.4-n Si(O--N═CR.sup.2.sub.2).sub.n, or R.sup.1.sub.4-n Si(O--N═CR.sup.3).sub.n, in which R 1 is an unsubstituted or substituted monovalent hydrocarbon group, R 2 is a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group, R 3 is an unsubstituted or substituted divalent hydrocarbon group forming a cyclic structure together with the carbon atom bonded to the nitrogen atom and the subscript n is 3or 4, or a partial hydrolysis product thereof; (c) from 0.01 to 10 parts by weight of an organotin compound; and (d) from 1 to 500 parts by weight of a combination of zinc carbonate and zinc hydroxide in a powdery form of which the content of zinc hydroxide is in the range from 5 to 50% by weight.
Claim 2
Dependent Claim
180 words
A room temperature-curable organopolysiloxane composition which comprises, as a blend: (a) 100 parts by weight of a diorganopolysiloxane having a viscosity in the range from 25 to 500,000 centistokes at 25° C., of which the molecular chain ends are blocked with silanolic hydroxy groups; (b) from 1 to 50 parts by weight of an iminoxysilane compound represented by the general formula R.sup.1.sub.4-n Si(O--N═CR.sup.2.sub.2).sub.n, or R.sup.1.sub.4-n Si(O--N═CR.sup.3).sub.n, in which R 1 is an unsubstituted or substituted monovalent hydrocarbon group, R 2 is a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group, R 3 is an unsubstituted or substituted divalent hydrocarbon group forming a cyclic structure together with the carbon atom bonded to the nitrogen atom and the subscript n is 3or 4, or a partial hydrolysis product thereof; (c) from 0.01 to 10 parts by weight of an organotin compound; and (d) from 1 to 500 parts by weight of a combination of zinc carbonate and zinc hydroxide in a powdery form of which the content of zinc hydroxide is in the range from 5 to 50% by weight.
Claim 3
Dependent Claim
28 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 in which the diorganopolysiloxane has a viscosity in the range from 1000 to 100000 centistokes at 25° C.
Claim 4
Dependent Claim
54 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 in which the iminoxysilane compound as the component (b) is selected from the group consisting of methyl tri(butanoxime) silane, vinyl tri(butanoxime) silane, phenyl tri(butanoxime) silane, propyl tri(butanoxime) silane, 3-chloropropyl tri(butanoxime) silane, methyl tri(isopentanoxime) silane, vinyl tri(cyclohexanoxime) silane, vinyl tri(cyclopentanoxime) silane and methyl tri(cyclohexanoxime) silane.
Claim 5
Dependent Claim
34 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 in which the combination of zinc carbonate and zinc hydroxide and the component (d) contains from 10 to 30% by weight of zinc hydroxide.
Claim 6
Dependent Claim
21 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 in which the organotin compound is an alkyl tin ester compound.
Claim 7
Dependent Claim
38 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 in which the amount of the component (d) is in the range from 5 to 100 parts by weight per 100 parts by weight of the component (a).
Claim 8
Dependent Claim
17 words
A cured silicone rubber body obtained by curing the room temperature-curable organopolysiloxane composition according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |