US3960786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing granular porous silicone rubbers
Assignee: Individual
•
Filing: 1974-05-30
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Granted: 1976-06-01
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Expires: 1994-05-30
Abstract
Abstract Granular porous silicone rubbers suitable to form articles to be embedded in human bodies or to be used to make up lost portions thereof are prepared by forming a composition containing a siloxnediole composition expressed by a formula ##EQU1## where R respectively represents a methyl radical, a phenyl radical or a vinyl radical and n is an integer of from 500 to 5,000, at least 0.5 % by weight based on the weight of the compound of formula (1) of a siloxanediol hydride compound expressed by a formula ##EQU2## where R' respectively represents a hydrogen radical or a methyl radical but at least one of R' radicals is a hydrogen radical, and n is an integer of from 2 to 1,000, a vulcanization catalyst and an emulsifying agent. The composition is then dispersed in water and the resulting emulsion is vulcanized while it is stirred thereby forming the granules of porous silicones.
Inventors
- 👤 Taichiro Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; A; A61; A61L; A61L27/00; A61L27/14; A61L27/18; C08J3/00; C08J3/12; C08J3/16; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08G77/20; C08G77/70; C08J2383/00; C08J2383/04; Y; Y10; Y10S; Y10S521/00; Y10S521/921
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A process for preparing granular porous silicone rubbers comprising the steps of preparing a composition containing a siloxanediol composition expressed by a formula ##EQU15## wherein R respectively represents a methyl radical, a phenyl radical or a vinyl radical and n is an integer of from 500 to 50,000, from 0.5 to 5% by weight based on the weight of the compound expressed by formula (1) of a siloxanediol hydride compound expressed by a formula ##EQU16## wherein R' respectively represents a hydrogen radical or a methyl radical but at least one of the R' radicals is a hydrogen radical, and n is an integer of from 2 to 1,000, a vulcanization catalyst, and an emulsifying agent, dispersing from 3 to 10% by weight of said composition in water based on the weight of the water, the amount of said emulsifying agent being 2 to 10% by weight based on the weight of said water, and vulcanizing the resulting emulsion while stirring same.
Claim 2
Dependent Claim
161 words
A process for preparing granular porous silicone rubbers comprising the steps of preparing a composition containing a siloxanediol composition expressed by a formula ##EQU15## wherein R respectively represents a methyl radical, a phenyl radical or a vinyl radical and n is an integer of from 500 to 50,000, from 0.5 to 5% by weight based on the weight of the compound expressed by formula (1) of a siloxanediol hydride compound expressed by a formula ##EQU16## wherein R' respectively represents a hydrogen radical or a methyl radical but at least one of the R' radicals is a hydrogen radical, and n is an integer of from 2 to 1,000, a vulcanization catalyst, and an emulsifying agent, dispersing from 3 to 10% by weight of said composition in water based on the weight of the water, the amount of said emulsifying agent being 2 to 10% by weight based on the weight of said water, and vulcanizing the resulting emulsion while stirring same.
Claim 3
Dependent Claim
28 words
The process according to claim 1, wherein said vulcanization catalyst is used by 0.5 to 5% by weight based on the weight of the compound of formula (1).
Claim 4
Dependent Claim
19 words
The process according to claim 1, wherein said water is maintained at a temperature of from 70° to 95°C.
Claim 5
Dependent Claim
15 words
The process according to claim 1, wherein said composition further contains a surface active agent.
Claim 6
Dependent Claim
13 words
The porous silicone rubber granule prepared according to the process of claim 1.
Claim 7
Dependent Claim
38 words
The porous silicone rubber granule as defined in claim 5, wherein said granule has a particle size of from about 0.1 mm to about 1.0 mm and a bulk specific gravity of from about 0.05 to about 0.5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |