US3868346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant polymeric compositions
Assignee: Sanwa Business Credit Corp
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Filing: 1972-12-14
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Granted: 1975-02-25
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Expires: 1992-12-14
Abstract
Abstract Fire retardant compositions are formed by admixing a silicone rubber with a hydrated alkali metal borate in amounts sufficient to form a vitreous composition when the borate is heated to its melting temperature and the silicone is thermally decomposed to form silica. The compositions are useful as insulators, which when heated, evolve only non-toxic gases and form a high melting vitreous layer which acts as a heat resistant protective coating.
Inventors
- 👤 Edward W Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:36
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/14; A24B; A24B15/00; A24B15/18; A24B15/28; A24B15/30; C; C08; C08K; C08K3/00; C08K3/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
A HEAT RESISTANT COMPOSITION COMPRISING A SILICONE POLYMER WHICH POLYMER DOES NOT EVOLVE A TOXIC GAS OR VAPOR WHEN OXIDIZED AT ELEVATED TEMPERATURES AND AN ALKALI METAL BORATE HYDRATE INTIMATELY ADMIXED, WITH THE BORATE RETAINED WITHIN SAID SILICONE, SAID BORATE HAVING A MELTING POINT BELOW THE TEMPERATURE WHEREIN SUBSTANTIALLY THERMAL DECOMPOSITION OF THE SILICONE OCCURS AND BEING REACTIVE WITH SILICA TO FORM A BOROSIL: ICATE GLASS, THE CONCENTRATION OF SAID BORATE BEING SUFFICIENT TO RENDER THE COMPOSITION FIRE RETARDANT AND BEING BETWEEN ABOUT 50 AND 80 PERCENT BY WEIGHT OF SAID COMPOSITION.
Claim 2
Dependent Claim
92 words
A HEAT RESISTANT COMPOSITION COMPRISING A SILICONE POLYMER WHICH POLYMER DOES NOT EVOLVE A TOXIC GAS OR VAPOR WHEN OXIDIZED AT ELEVATED TEMPERATURES AND AN ALKALI METAL BORATE HYDRATE INTIMATELY ADMIXED, WITH THE BORATE RETAINED WITHIN SAID SILICONE, SAID BORATE HAVING A MELTING POINT BELOW THE TEMPERATURE WHEREIN SUBSTANTIALLY THERMAL DECOMPOSITION OF THE SILICONE OCCURS AND BEING REACTIVE WITH SILICA TO FORM A BOROSIL: ICATE GLASS, THE CONCENTRATION OF SAID BORATE BEING SUFFICIENT TO RENDER THE COMPOSITION FIRE RETARDANT AND BEING BETWEEN ABOUT 50 AND 80 PERCENT BY WEIGHT OF SAID COMPOSITION.
Claim 3
Dependent Claim
10 words
The composition of claim 1 wherein the borate is borax.
Claim 4
Dependent Claim
10 words
The composition of claim 1 which contains a silica filler.
Claim 5
Dependent Claim
10 words
The composition of claim 2 which contains a silica filler.
Claim 6
Dependent Claim
11 words
The composition of claim 1 wherein the silicone polymer is crosslinked.
Claim 7
Dependent Claim
11 words
The composition of claim 2 wherein the silicone polymer is crosslinked.
Claim 8
Dependent Claim
11 words
The composition of claim 3 wherein the silicone polymer is crosslinked.
Claim 9
Dependent Claim
11 words
The composition of claim 4 wherein the silicone polymer is crosslinked.
References Cited (Backward Citations)
US3146799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |