EP0037226A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Flame retardant silicone rubber compositions containing carboxamides
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1981-03-23
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Granted: —
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Expires: 2001-03-23
Abstract
Abstract A flame retardant silicone rubber with improved flame retardant properties and colorability can be obtained from a polydiorganosiloxane, a silica filler, a carboxamide, a platinum, an organic peroxide, and optionally cerium oxide or cerium hydroxide.
Inventors
- 👤 Mitsuo Hamada
- 👤 Sadami Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 08:37
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A flame retardant silicone rubber composition comprising (A) 100 parts by weight of a polydiorganosiloxane of the average unit formula in which each R is a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals and a has an average value of from 1.95 to 2.05 inclusive, (B) 0 to 150 parts by weight of a fine particle silica filler, and CHARACTERIZED IN THAT it includes (C) 1 to 200 ppm by weight of platinum based on the weight of (A), in the form of platinum or a platinum-containing compound, (D) 0.01 to 5 parts by weight of a carboxamide, and (E) 0.1 to 5 parts by weight of an organic peroxide.
Claim 2
Dependent Claim
117 words
A flame retardant silicone rubber composition comprising (A) 100 parts by weight of a polydiorganosiloxane of the average unit formula in which each R is a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals and a has an average value of from 1.95 to 2.05 inclusive, (B) 0 to 150 parts by weight of a fine particle silica filler, and CHARACTERIZED IN THAT it includes (C) 1 to 200 ppm by weight of platinum based on the weight of (A), in the form of platinum or a platinum-containing compound, (D) 0.01 to 5 parts by weight of a carboxamide, and (E) 0.1 to 5 parts by weight of an organic peroxide.
Claim 3
Dependent Claim
53 words
The composition according to claim 1 in which the polydiorganosiloxane of (A) is a gum, (B) is from 10 to 80 parts by weight of a fumed silica filler, (D) is present in an amount of from 0.1 to 5 parts by weight, and the organic peroxide of (E) is an acyl peroxide.
Claim 4
Dependent Claim
23 words
The composition according to claims 1 or 2 further comprising (F) 0.1 to 10 parts by weight of cerium oxide or cerium hydroxide.
Claim 5
Dependent Claim
112 words
The composition according to claim 2 in which the gum of (A) is a polydiorganosiloxane in which the organic radicals are methyl and vinyl radicals or methyl, vinyl, and phenyl radicals, the fumed silica filler is present in an amount of from 30 to 60 parts by weight, (C) is a platinum compound present in an amount sufficient to provide from 5 to 100 parts by weight of platinum per 1,000,000 parts by weight of (A), the carbodamide of (D) is present in an amount of from 0.2 to 3 parts by weight, and the acyl peroxide of (E) is present in an amount of from 0.5 to 3 parts by weight.
Claim 6
Dependent Claim
21 words
The composition according to claim 4 further comprising (F) 0.5 to 5 parts by weight of cerium oxide or cerium hydroxide.
Claim 7
Independent Claim
176 words
A method for preparing a flame retardant silicone rubber composition CHARACTERIZED BY (I) mixing (A) 100 parts by weight of a polydiorganosiloxane gum of the average unit formula in which each R is a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals and a has an average value of from 1.95 to 2.05 inclusive. (B) 5 to 150 parts by weight of a fine particle silica filler, and optionally a processing aid, to obtain a mixture (II) heating the mixture obtained in (I) to a temperature of 30° to 250°C for at least 10 minutes, (III) cooling the mixture, and thereafter (IV) admixing with the mixture (C) 1 to 200 parts by weight of platinum per 1,000,000 parts by weight of (A) or an amount of a platinum compound sufficient to provide from 1 to 200 parts by weight of platinum per 1,000,000 parts by weight of (A), (D) 0.01 to 5 parts by weight of a carboxamide, and (E) 0.15 to 5 parts by weight of an organic peroxide.
Claim 8
Independent Claim
176 words
A method for preparing a flame retardant silicone rubber composition CHARACTERIZED BY (I) mixing (A) 100 parts by weight of a polydiorganosiloxane gum of the average unit formula in which each R is a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals and a has an average value of from 1.95 to 2.05 inclusive. (B) 5 to 150 parts by weight of a fine particle silica filler, and optionally a processing aid, to obtain a mixture (II) heating the mixture obtained in (I) to a temperature of 30° to 250°C for at least 10 minutes, (III) cooling the mixture, and thereafter (IV) admixing with the mixture (C) 1 to 200 parts by weight of platinum per 1,000,000 parts by weight of (A) or an amount of a platinum compound sufficient to provide from 1 to 200 parts by weight of platinum per 1,000,000 parts by weight of (A), (D) 0.01 to 5 parts by weight of a carboxamide, and (E) 0.15 to 5 parts by weight of an organic peroxide.
Claim 9
Dependent Claim
28 words
The method in accordance with claim 6 further comprising heating the resulting composition above the activation temperature of the organic peroxide and obtaining a flame retardant silicone rubber.
Claim 10
Dependent Claim
24 words
The method in accordance with claim 6 further comprising in (IV), (F) 0.1 to 10 parts by weight of cerium oxide or cerium hydroxide.
Claim 11
Dependent Claim
28 words
The method in accordance with claim 8 further comprising heating the resulting composition above the activation temperature of the organic peroxide and obtaining a flame retardant silicone rubber.
Claim 12
Dependent Claim
14 words
The flame retardant silicone rubber obtained from the method of claims 7 or 9.
References Cited (Backward Citations)
No citation records indexed.
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