Patent US4174338A successfully refreshed from Google Patents.
US4174338A
Expired / Lapsed
US
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Pasty compositions for crosslinking organopolysiloxanes to silicone rubber
Assignee: Bayer AG
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Filing: 1977-09-26
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Granted: 1979-11-13
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Expires: 1997-09-26
Abstract
Abstract A pasty composition for the room temperature crosslinking and curing of a vulcanizable organopolysiloxane, comprising a crosslinking agent for an organopolysiloxane, a curing catalyst therefor, and about 3-40% by weight of the total amount of the pasty composition of active hydrophilic silica as a thickener. The pasty composition may additionally contain up to about 40% by weight of at least one inactive filler. Advantageously, the organopolysiloxane is in one tube and the pasty composition is in another; lengths of material are squeezed out in easily ascertained proportions and are mixed in the presence of water, e.g. water vapor in the atmosphere, the mixture setting to a silicone rubber.
Inventors
- 👤 Heinz Goller
- 👤 Hans-Hermann Schulz
- 👤 Bernhard Leusner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; A; A61; A61K; A61K6/00; A61K6/90; C08K5/00; C08K5/0008; C08K5/0016; C08K5/0025; C08K5/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
46 words
A pasty composition for the room temperature crosslinking and curing of a vulcanizable organopolysiloxane, comprising a crosslinking agent for an organopolysiloxane, a curing catalyst therefor, and about 3-40% by weight of the total amount of the pasty composition of active hydrophilic silicic acid as a thickener.
Claim 2
Dependent Claim
46 words
A pasty composition for the room temperature crosslinking and curing of a vulcanizable organopolysiloxane, comprising a crosslinking agent for an organopolysiloxane, a curing catalyst therefor, and about 3-40% by weight of the total amount of the pasty composition of active hydrophilic silicic acid as a thickener.
Claim 3
Dependent Claim
20 words
A composition according to claim 1, additionally containing up to about 40% by weight of at least one inactive filler.
Claim 4
Dependent Claim
15 words
A composition according to claim 1, wherein the silicic acid comprises about 20% by weight.
Claim 5
Dependent Claim
52 words
In the production of a crosslinked and cured silicone rubber by mixing a vulcanizable organopolysiloxane with a crosslinking agent and a curing catalyst therefor in the presence of water, the improvement which comprises employing the crosslinking agent and the curing catalyst in the form of a pasty composition according to claim 1.
Claim 6
Dependent Claim
23 words
The process according to claim 4, wherein the pasty composition contains up to about 40% by weight of at least one inactive filler.
References Cited (Backward Citations)
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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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |