US3723481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ablative coating compositions
Assignee: General Electric Co
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Filing: 1969-09-22
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Granted: 1973-03-27
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Expires: 1989-09-22
Abstract
Abstract A silicone elastomer which is quite useful as an ablative coating composition comprises (A) an organopolysiloxane having a ratio of from about 1.95 to about 2.01 organo radicals per silicon atom consisting essentially of alkyl and aryl radicals in which the ratio of aryl radicals to silicon can have a value of from about 0.20 to about 0.60, inclusive, (B) a reinforcing amount of a silica filler, (C) an effective amount of a member selected from the class of metals, metalloids and mixtures thereof of elements of Groups IIA, IIIB, IVB, VB, VIB, VIIB, VIII, IB, IIB, IIIA, IVA, and VA of the Periodic Table of Elements, and (D) a char reinforcing material.
Inventors
- 👤 W Bobear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:12
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
An ablative organopolysiloxane composition in accordance with claim 1, in which the organopolysiloxane has the formula, (1) (R)a(R'')b(R'''')cSiO(4-a-b-c/2), where R is selected from the class consisting of aryl radicals and halogenated aryl radicals, R'' is selected from alkenyl radicals, and R'''' is selected from alkyl radicals, a has a value of from about 0.20 to about 0.60, inclusive, b has a value of from about 0.0005 to about 0.02, inclusive, the ratio of a/b has a value of less than 150 and c has a value of from about 1.33 to about 1.81.
Claim 2
Dependent Claim
35 words
A composition in accordance with claim 1, in which the organopolysiloxane is a methylphenylpolysiloxane to which the ratio of the phenyl radicals to silicon is in the range of from about 0.20 to about 0.50.
Claim 3
Dependent Claim
33 words
A composition in accordance with claim 1, in which the silica filler is a fumed silica which is present in a proportion of from 25 to 100 parts per 100 parts of organopolysiloxane.
Claim 4
Dependent Claim
28 words
A composition in accordance with claim 1, in which the metalloid is silicon in a proportion of from about 2 to 30 parts per 100 parts of organopolysiloxane.
Claim 5
Dependent Claim
29 words
A composition in accordance with claim 1, in which the char reinforcing material is a member selected from the class consisting of glass fibers, graphite fibers, and asbestos fibers.
Claim 6
Dependent Claim
13 words
A composition in accordance with claim 1, in which the metalloid is boron.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |