US4405425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 11:40
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.
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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) | 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 |