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US 4,366,278 AGranted
Flame retardant silicone rubber compositions containing carboxamides
AssigneeToray Silicone Company, Ltd.
InventorsMitsuo Hamada, Sadami Yasuda
Life of this patent
Estimating the term…
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.
Claims22
A flame retardant silicone rubber composition comprising
- (A) 100 parts by weight of a polydiorganosiloxane of the average unit formula ##EQU3## in which each R is a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals and a has a value of from 1.95 to 2.05 inclusive,
- (B) 0 to 150 parts by weight of a fine particle silica filler,
- (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 carboxamide being formed from an acid selected from a monobasic acid, a multibasic acid, and a hydroxycarboxylic acid which acid is selected from carbonic acid, formic acid, aliphatic carboxylic acids, and aromatic carboxylic acids;
- which carboxamide is an amide which is a primary amide, a secondary amide, or a tertiary amide in which the amide contains alkyl, aryl, or hydrogen atoms bonded to nitrogen, and
- (E) 0.1 to 5 parts by weight of an organic peroxide.
3 more elements
A method for preparing a flame retardant silicone rubber composition comprising
- (I) mixing
- (A) 100 parts by weight of a polydiorganosiloxane gum of the average unit formula ##EQU4## in which each R is a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals and a has a 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 50.degree. to 250.degree. C. for at least 10 minutes,
- (III) cooling the mixture, and thereafter
- (IV) admixing with the mixture
- (C) 1 to 200 parts by weight 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 being formed from an acid selected from a monobasic acid, a multibasic acid, and a hydroxycarboxylic acid which acid is selected from carbonic acid, formic acid, aliphatic carboxylic acids, and aromatic carboxylic acids;
- which carboxamide is an amide which is a primary amide, a secondary amide, or a tertiary amide in which the amide contains alkyl, aryl, or hydrogen atoms bonded to nitrogen, and
- (E) 0.15 to 5 parts by weight of an organic peroxide.
7 more elements
Dependencies are inferred from the claim text.