US4265800A
Expired / Lapsed
US
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Stabilized heat curable silicone elastomers
Assignee: Wacker Chemical Corp
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Filing: 1979-11-13
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Granted: 1981-05-05
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Expires: 1999-11-13
Abstract
Abstract Silicone elastomers having improved heat stability, and resistance to reversion may be obtained by incorporating tellurium in heat curable organopolysiloxane compositions containing amorphorus silica fillers.
Inventors
- 👤 Harry V. Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:40
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; C08K3/34; C08K3/36; C08K5/00; C08K5/04; C08K5/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
A heat curable organopolysiloxane composition composed of an organopolysiloxane polymer, an organic peroxide curing agent, an amphorous silica filler and at least 0.005 percent by weight based on the weight of the organopolysiloxane polymer of tellurium.
Claim 2
Dependent Claim
36 words
A heat curable organopolysiloxane composition composed of an organopolysiloxane polymer, an organic peroxide curing agent, an amphorous silica filler and at least 0.005 percent by weight based on the weight of the organopolysiloxane polymer of tellurium.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein the composition contains from 0.005 to 5 percent by weight of tellurium.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein the organopolysiloxane polymer has from 1.9 to 2.2 organic radicals per silicon atom.
Claim 5
Dependent Claim
52 words
The composition of claim 1 which includes an anti-structuring agent selected from the group consisting of water, hydroxyl-terminated silanes and siloxanes, methyl enblocked polysiloxane fluids, phosphate fluids, glycols, esters and anhydrides thereof in an amount of from about 2 to 30 percent by weight based on the weight of the organopolysiloxane polymer.
Claim 6
Dependent Claim
18 words
The composition of claim 1 wherein the organopolysiloxane polymer contains from 0.01 to 0.35 mole percent vinyl groups.
Claim 7
Dependent Claim
8 words
The heat cured organopolysiloxane elastomer of claim 1.
Claim 8
Dependent Claim
21 words
The elastomer of claim 6 wherein the organopolysiloxane polymer is a methylvinylsiloxane containing from 0.01 to 0.35 mole percent vinyl groups.
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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |