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US4405425A
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Flame-retardant polysiloxane elastomers
Assignee: Wacker Chemie AG
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Filing: 1980-12-29
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Granted: 1983-09-20
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Expires: 2000-12-29
Abstract
Abstract Flame-retardant elastomers are prepared by adding a metal hydroxide and/or a hydrate of a metal oxide and graphite to an organopolysiloxane composition which is capable of being crosslinked to form an elastomer.
Inventors
- 👤 August Schiller
- 👤 Dietrich Wolfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:13
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A composition capable of being cured to form a flame-retardant elastomer consisting essentially of an organopolysiloxane, graphite having a surface area of from 3 to 15 m 2 /g, a compound selected from the group consisting of alumina trihydrate, ceric hydroxide, cerous hydroxide, tricalcium aluminate hexahydrate, magnesium hydroxide and mixtures thereof and a crosslinking agent.
Claim 2
Dependent Claim
55 words
A composition capable of being cured to form a flame-retardant elastomer consisting essentially of an organopolysiloxane, graphite having a surface area of from 3 to 15 m 2 /g, a compound selected from the group consisting of alumina trihydrate, ceric hydroxide, cerous hydroxide, tricalcium aluminate hexahydrate, magnesium hydroxide and mixtures thereof and a crosslinking agent.
Claim 3
Dependent Claim
27 words
The composition of claim 1, wherein graphite is present in an amount of from 1 to 5 percent by weight based on the weight of the composition.
Claim 4
Dependent Claim
68 words
The composition of claim 1, wherein the organopolysiloxane is a diorganopolysiloxane of the formula Z.sub.n SiR.sub.3-n O(SiR.sub.2 O).sub.x SiR.sub.3-n Z.sub.n where R is selected from the group consisting of monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, Z is a hydroxyl group, n is 1 and x is a number having a value such that the average viscosity of the diorganopolysiloxane is at least 50 mPa.s at 25°.
Claim 5
Dependent Claim
11 words
The composition of claim 1, wherein the compound is alumina trihydrate.
Claim 6
Dependent Claim
11 words
The composition of claim 1, wherein the compound is ceric hydroxide.
Claim 7
Dependent Claim
14 words
The composition of claim 1, wherein the crosslinking agent is an organic peroxide compound.
Claim 8
Dependent Claim
81 words
A flame-retardant elastomer which is obtained from high energy radiation of a composition consisting of an organopolysiloxane, graphite having a surface area of from 3 to 15 m 2 /g, a compound selected from the group consisting of alumina trihydrate, ceric hydroxide, cerous hydroxide, tricalcium aluminate hexahydrate, magnesium hydroxide and mixtures thereof said grahite being present at from 0.5 to 3% by weight of the composition and said compound being present at from 10 to 60% by weight of the composition.
Claim 9
Dependent Claim
81 words
A flame-retardant elastomer which is obtained from high energy radiation of a composition consisting of an organopolysiloxane, graphite having a surface area of from 3 to 15 m 2 /g, a compound selected from the group consisting of alumina trihydrate, ceric hydroxide, cerous hydroxide, tricalcium aluminate hexahydrate, magnesium hydroxide and mixtures thereof said grahite being present at from 0.5 to 3% by weight of the composition and said compound being present at from 10 to 60% by weight of the composition.
References Cited (Backward Citations)
US3137670A
Cited
US3268473A
Cited
US3234115A
Cited
US3574644A
Cited
US3836480A
Cited
US3696090A
Cited
US3821140A
Cited
US3912671A
Cited
US3965065A
Cited
US4221693A
Cited
US4288360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |