US3969310A
Expired / Lapsed
US
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Silicone rubber compositions
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1975-08-21
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Granted: 1976-07-13
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Expires: 1995-08-21
Abstract
Abstract Silicone rubber compositions consisting essentially of an organopolysiloxane containing in a molecule at least one linearly-linked cyclic siloxane unit and at least two alkenyl groups directly bonded to silicon atoms, an organohydrogenpolysiloxane, and a platinum catalyst. These compositions are cured to form solid elastomers which exhibit a very low permeability to water vapor, and are useful for enclosing electronic units.
Inventors
- 👤 Kunio Itoh
- 👤 Naohiko Harada
- 👤 Masaki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08L; C08L83/00; C08L83/04; C08L83/14; C08G; C08G77/00; C08G77/04; C08G77/045; C08G77/12; C08G77/20; C08G77/48; C08G77/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
A silicone rubber composition consisting essentially of (a) an organopolysiloxane containing in a molecule at least two alkenyl groups directly bonded to silicon atoms and at least one linearly-linked cyclic siloxane unit represented by the formula ##EQU17## where each R which may be identical or different, and is a substituted or unsubstituted monovalent hydrocarbon group, (b) an organohydrogenpolysiloxane represented by the average formula ##EQU18## where R' is same as R above, a is 1 to 2, and b is 0.2 to 1.2 with the proviso that (a + b) is 1.8 to 3.0, and having at least two hydrogen atoms directly bonded to silicon atoms per molecule, in an amount enough to provide from 0.8 to 2.5 hydrogen atoms directly bonded to silicon atoms for each alkenyl group present in component (a) above, and (c) a catalytic amount of platinum or a platinum compound.
Claim 2
Dependent Claim
144 words
A silicone rubber composition consisting essentially of (a) an organopolysiloxane containing in a molecule at least two alkenyl groups directly bonded to silicon atoms and at least one linearly-linked cyclic siloxane unit represented by the formula ##EQU17## where each R which may be identical or different, and is a substituted or unsubstituted monovalent hydrocarbon group, (b) an organohydrogenpolysiloxane represented by the average formula ##EQU18## where R' is same as R above, a is 1 to 2, and b is 0.2 to 1.2 with the proviso that (a + b) is 1.8 to 3.0, and having at least two hydrogen atoms directly bonded to silicon atoms per molecule, in an amount enough to provide from 0.8 to 2.5 hydrogen atoms directly bonded to silicon atoms for each alkenyl group present in component (a) above, and (c) a catalytic amount of platinum or a platinum compound.
Claim 3
Dependent Claim
21 words
The silicone rubber composition as claimed in claim 1 wherein said monovalent hydrocarbon group denoted by R is an alkyl group.
Claim 4
Dependent Claim
31 words
The silicone rubber composition as claimed in claim 1 wherein component (a) is an organopolysiloxane expressed by the formula ##EQU19## where p l is a positive integer of at least 1.
Claim 5
Dependent Claim
30 words
The silicone rubber composition as claimed in claim 1 wherein component (a) is an organopolysiloxane expressed by the formula ##EQU20## where p is a positive integer of at least 1.
Claim 6
Dependent Claim
30 words
The silicone rubber composition as claimed in claim 1 wherein component (a) is an organopolysiloxane expressed by the formula ##EQU21## where p is a positive integer of at least 1.
Claim 7
Dependent Claim
30 words
The silicone rubber composition as claimed in claim 1 wherein component (a) is an organopolysiloxane expressed by the formula ##EQU22## where p is a positive integer of at least 1.
Claim 8
Dependent Claim
30 words
The silicone rubber composition as claimed in claim 1 wherein component (a) is an organopolysiloxane expressed by the formula ##EQU23## where p is a positive integer of at least 1.
Claim 9
Dependent Claim
22 words
The silicone rubber composition as claimed in claim 1 wherein component (b) is a linear organohydrogenpolysiloxane comprising a plurality of methylhydrogenpolysiloxane units.
Claim 10
Dependent Claim
15 words
The silicone rubber composition as claimed in claim 1 which additionally includes an inorganic filler.
Claim 11
Dependent Claim
17 words
The silicone rubber composition as claimed in claim 9 wherein said inorganic filler is finely divided quartz.
Claim 12
Dependent Claim
35 words
The silicone rubber composition as claimed in claim 10 wherein said finely divided quartz is present in an amount of from 100 to 250 parts by weight per 100 parts by weight of component (a).
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |