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US4329273A
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Self-bonding silicone rubber compositions
Assignee: General Electric Co
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Filing: 1980-05-02
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Granted: 1982-05-11
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Expires: 2000-05-02
Abstract
Abstract A self-bonding silicone rubber composition comprising a vinyl-terminated polysiloxane polymer, a hydride siloxane cross-linking agent, a platinum catalyst and as the self-bonding additive, the partial hydrolysis product of an aliphatically unsaturated hydrolyzable alkoxy silane.
Inventors
- 👤 Bruce B. Hardman
- 👤 George M. Dujack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:53
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/22; C08G77/24; C08G77/70
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
A self-bonding silicone rubber composition comprising (A) 100 parts by weight of a base polymer of the formula, ##STR8## where R is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, and x is such that the viscosity of the base polymer varies from 100 to 200,000,000 centipoise at 25° C.; (B) from 0.5 to 50 parts by weight of a hydride siloxane cross-linking agent; (C) from 1 to 500 parts per million of platinum catalyst; and (D) from 0.1 to 5 parts by weight of a self-bonding additive which is the partial hydrolysis product of a compound of the formula, R.sub.a.sup.1 Si (OR.sup.3).sub.4-a wherein R 1 is an aliphatic unsaturated radical selected from the class consisting of alkenyl radicals and alkynyl radicals of 2 to 8 carbon atoms, R 3 is selected from the class consisting of alkyl radicals and cycloalkyl radicals of 1 to 8 carbon atoms and is 1 and wherein the partial hydrolysis product is such that on the average 16 to 49 mole percent of the hydrocarbonoxy groups of said silane are hydrolyzed.
Claim 2
Dependent Claim
183 words
A self-bonding silicone rubber composition comprising (A) 100 parts by weight of a base polymer of the formula, ##STR8## where R is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, and x is such that the viscosity of the base polymer varies from 100 to 200,000,000 centipoise at 25° C.; (B) from 0.5 to 50 parts by weight of a hydride siloxane cross-linking agent; (C) from 1 to 500 parts per million of platinum catalyst; and (D) from 0.1 to 5 parts by weight of a self-bonding additive which is the partial hydrolysis product of a compound of the formula, R.sub.a.sup.1 Si (OR.sup.3).sub.4-a wherein R 1 is an aliphatic unsaturated radical selected from the class consisting of alkenyl radicals and alkynyl radicals of 2 to 8 carbon atoms, R 3 is selected from the class consisting of alkyl radicals and cycloalkyl radicals of 1 to 8 carbon atoms and is 1 and wherein the partial hydrolysis product is such that on the average 16 to 49 mole percent of the hydrocarbonoxy groups of said silane are hydrolyzed.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein 1 to 1.5 parts by weight of self-bonding additive is utilized.
Claim 4
Dependent Claim
29 words
The composition of claim 1 wherein R is selected from the class consisting of alkyl radicals, cycloalkyl radicals, aryl radicals and flucroalkyl radicals of 1 to 8 carbon atoms.
Claim 5
Dependent Claim
62 words
The composition of claim 1 wherein the hydride siloxane cross-linking agent has the formula, ##STR9## where R 7 is selected from the class consisting of hydrogen, monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R 4 is a monovalent hydrocarbon radical and y varies such that the polymer has a viscosity in the range of 10 to 500 centipoise at 25° C.
Claim 6
Dependent Claim
65 words
The composition of claim 1 wherein the hydride silixoane cross-linking agent is a resin composed of H R 2 5 SiO 0 .5 units, and SiO 2 units wherein the ratio of the H+R 5 radicals to Si varies from 1.0 to 1.0, to 2.7 to 1.0 wherein R 5 is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals.
Claim 7
Dependent Claim
67 words
The composition of claim 1 wherein there is additionally present from 10 to 200 parts by weight of a compound selected from reinforcing fillers, extending fillers, and a vinyl-containing reinforcing resin comprising R 6 SiO 0 .5 units and SiO 2 units, in which from about 2.5 to 10 mole percent of the silicon atoms contain silicon-bonded vinyl groups where R 6 is a monovalent hydrocarbon radical.
Claim 8
Dependent Claim
21 words
The composition of claim 1 wherein the reinforcing filler is selected from the class consisting of fumed silica and precipitated silica.
Claim 9
Dependent Claim
25 words
The composition of claim 7 wherein said filler is treated with a treating agent selected from the class consisting of cyclosiloxanes silazanes and mixtures thereof.
Claim 10
Dependent Claim
68 words
The composition of claim 1 wherein there is present from 1 to 30 parts by weight of a vinyl-containing polymer of the formula, ##STR10## wherein R 6 is selected from the class consisting of alkyl radicals, cycloalkyl radicals, aryl radicals and fluoroalkyl radicals of 1 to 8 carbon atoms where z varies such that the viscosity of the polymer varies from 100 to 5,000 centipoise at 25° C.
Claim 11
Dependent Claim
21 words
The composition of claim 1 wherein there is present from 0 to 50 parts by weight of a vinyl-containing silicone resin.
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) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |