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US 4,731,406 AGranted
Flame-retardant low-smoking rubber composition
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKunio Itoh, Tsutomu Nakamura, Ken-ichi Takita
Life of this patent
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Abstract
Vulcanizates of so-called EPM and EPDM rubber compositions can be imparted with greatly improved flame retardancy and emit a greatly decreased volume of smoke in burning when the rubber composition is compounded with a conventional flame retardant agent of aluminum or magnesium hydroxide together with a polymer of an acrylic acid ester and an organopolysiloxane in combination or a copolymer composed of the moieties of these two kinds of monomeric units in a limited weight proportion.
Claims2
A flame-retardant and low-smoking rubber composition which comprises:
- (a) 100 parts by weight of a rubbery copolymer of monomers comprising ethylene and propylene;
- (b) from 10 to 150 parts by weight of a combination of
- (b-1) from 20 to 80% by weight of a polymer of an acrylic acid ester and
- (b-2) from 80 to 20% by weight of an organopolysiloxane, or from 10 to 150 parts by weight of (b-3) a copolymer essentially composed of from 20 to 80% by weight of a moiety of an acryclic acid ester and from 80 to 20% by weight of a moiety of an organopolysiloxane;
- and
- (c) aluminum hydroxide, magnesium hydroxide or a combination thereof in an amount in the range from 30 to 150% by weight based on the total amount of the components (a) and (b).
3 more elements
Dependencies are inferred from the claim text.