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CA1172786A Expired / Lapsed CA ⏱️ 0.0 years remaining

Flame-retardant elastomers

Assignee: Wacker Chemie AG
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Filing: 1981-01-07
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Granted: 1984-08-14
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Expires: 2001-01-07
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Abstract

Abstract ABSTRACT OF THE DISCLOSURE Flame-retardant elastomers are prepared by adding a metal hy-droxide and/or a hydrate of a metal oxide e.g. alumina trihydrate, ceric hydroxide, cerous hydroxide, tricalcium aluminate hexahydrate, magnesium hydroxide and mixtures thereof and graphite e.g. having a surface area of 3-15 m2/g to an organopolysiloxane composition which is capable of being cross-linked to form an elastomer. These elastomers have better flame-retardant and self-extinguishing properties than the elastomers known heretofore. They exhibit higher tensile strength and better resistance to tear propagation than elastomers obtained from previously known com-positions.

Inventors

  • 👤 August Schiller
  • 👤 Dietrich Wolfer

Bibliographic Details

Application Number —
Jurisdiction CA
Data Source google_patents
Last Synchronized 2026-11-09 09:53
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 48 words
A composition capable of being cured to form a flame-retardant elastomer comprising an organopolysiloxane, graphite having a surface area of from 3 to 15 m2/g, and a compound selected from the group consisting of alumina trihydrate, ceric hydroxide, cerous hydroxide, tricalcium aluminate hexahydrate, magnesium hydroxide and mixtures thereof.
Claim 2
Dependent Claim 48 words
A composition capable of being cured to form a flame-retardant elastomer comprising an organopolysiloxane, graphite having a surface area of from 3 to 15 m2/g, and a compound selected from the group consisting of alumina trihydrate, ceric hydroxide, cerous hydroxide, tricalcium aluminate hexahydrate, magnesium hydroxide and mixtures thereof.
Claim 3
Dependent Claim 27 words
The composition of claim 1 wherein graphite is present in an amount of from 0.5 to 30 percent by weight based on the weight of the composition.
Claim 4
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 com-position.
Claim 5
Dependent Claim 89 words
The composition of claim 1 wherein the composition contains a diorganopolysiloxane of the formula ZnSi R3-n O (Si R2 O)x Si R3-n Zn where R is selected from the group consisting of monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, Z is selected from the group consisting of a hydroxyl group and a hydrolyzable group, n is 0, 1, 2 or 3 and x is a number having a value such that the average viscosity of the diorganopolysiloxane is at least 50 mPa.s at 25°C. and a cross-linking agent.
Claim 6
Dependent Claim 11 words
The composition of claim 1 wherein the compound is alumina trihydrate.
Claim 7
Dependent Claim 11 words
The composition of claim 1 wherein the compound is ceric hydroxide.
Claim 8
Dependent Claim 12 words
The composition of claim 1, wherein the composition contains a crosslinking agent.
Claim 9
Dependent Claim 18 words
The composition of claim 1, wherein the compound is a mix-ture containing alumina trihydrate and tricalcium aluminate hexahydrate.

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