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AssigneeFujikura Ltd.
InventorsMasatake Hasegawa, Hirotada Kobayashi, Hideo Sunazuka, Akira Yoshino, Takao Matsuda, Yoshioki Shingo
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A flame-retardant composition is prepared by mixing 100 parts by weight of a rubber or plastics free from any halogen with about 50 to about 200 parts by weight of magnesium hydroxide having an average particle diameter of about 0.3 to about 2 .mu.m and about 5 to about 50 parts by weight of carbon black powder having an oil absorption of about 0.5 to about 2.0 ml/g, and then cross-linking the mixture with an organic peroxide, sulfur, or a sulfur compound as a vulcanizing agent. By forming an electrical insulation and/or a sheath of the flame-retardant composition, there is provided a flame-retardant cable of the type including a cable core composed of an electric conductor coated with the electrical insulation or a plurality of such cores twisted together and covered, together with a filler, with the sheath. The flame-retardant composition and the flame-retardant cable using this composition possess high flame resistance while possessing acceptable mechanical properties and will not evolve any hydrogen halide or other noxious gas if burnt. With less smoke emission than conventional cables on fire, the composition and the cable are less hazardous.
A flame-retardant composition prepared by mixing ( 1) 100 parts by weight of a halogen-free polymer, (2) about 50 to 200 parts by weight of magnesium hydroxide having an average particle diameter of about 0.3 to about 2 .mu.m, (3) about 5 to about 50 parts by weight of carbon black powder having an oil absorption of about 0.5 to about 2.0 ml g.sup.-1, (4) about 3 to about 10 parts by weight of an organopolysiloxane, and (5) about 3 to about 10 parts by weight of a basic lead compound of the formula xPbO.Pb(R).yH.sub.2 O, in 0.ltoreq.x.ltoreq.3, R is a higher fatty acid group, an aromatic carboxylic acid group having 6 or more carbon atoms or a sulfuric acid group, and 0.ltoreq.y.ltoreq.10, and then cross-linking the mixture obtained with an inorganic peroxide, sulfur, or a sulfur compound as a vulcanizing agent.
A flame-retardant composition prepared by mixing (1) 100 parts by weight a halogen-free polymer, (2) about 50 to about 200 parts by weight of magnesium hydroxide having an average particle diameter of about 0.3 to about 2 .mu.m, (3) about 5 to about 50 parts by weight of carbon black powder having an oil absorption of about 0.5 to about 2.0 ml g.sup.-1, (4) a flame-retardant containing red phosphorus in an amount such that the red phosphorus makes up about 2 to about 15 parts by weight per 100 parts by weight of the said halogen-free polymer, (5) about 3 to about 10 parts by weight of an organopolysiloxane, and (6) about 3 to about 10 parts by weight of a basic lead compound of the formula xPbO . Pb(R) . yH.sub.2 O, in which 0.ltoreq.x.ltoreq.3, R is a higher fatty acid group, an aromatic carboxylic acid group having 6 or more carbon atoms or a sulfuric acid group, and 0.ltoreq.y.ltoreq.10, and then cross-linking the mixture obtained with an organic peroxide, sulfur, or a sulfur compound as a vulcanizing agent.
A flame-retardant composition prepared by mixing (1) 100 parts by weight of a halogen-free polymer which is at least one member selected from the group consisting of polyethylenes, natural rubbers, butyl rubbers, silicone rubbers, ethylene propylene rubbers, ethylene propylene diene elastomers, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, ethylene-.alpha.-olefin copolymers, ethylene acrylic elastomers, hydrogenated styrene-butadiene elastomers, polyester elastomers, and their blends, (2) about 50 to about 200 parts by weight of magnesium hydroxide having an average particle diameter of about 0.3 to about 2 .mu.m, said magnesium hydroxide being surface-treated with stearic acid or oleic acid, (3) about 5 to about 50 parts by weight of carbon black powder having an oil absorption of about 0.5 to about 2.0 ml g.sup.-1, and (4) a flame retardant containing red phosphorus in an amount such that the red phosphorus makes up about 2 to about 15 parts by weight, and then cross-linking the mixture with an organic peroxide, sulfur, or a sulfur compound as a vulcanizing agent.
A flame-retardant composition prepared by mixing (1) 100 parts by weight of a halogen-free polymer which is at least one member selected from the group consisting of polyethylenes, nature rubbers, butyl rubbers, silicone rubbers, ethylene propylene rubbers, ethylene propylene diene elastomers, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, ethylene-.alpha.-olefin copolymers, ethylene acrylic elastomers, hydrogenated styrene-butadiene elastomers, polyester elastomers and their blends, (2) about 50 to about 200 parts by weight of magnesium hydroxide having an average particle diameter of about 0.3 to about 2 .mu.m, said magnesium hydroxide being surface-treated with stearic acid or oleic acid, (3) about 5 to 50 parts by weight of carbon black powder having an oil absorption of about 0.5 to about 2.0 ml g.sup.-1, (4) about 3 to about 10 parts by weight of an organopolysiloxane, and (5) about 3 to about 10 parts by weight of a basic lead compound of the formula xPbO.Pb(R).yH.sub.2 O, in which 0.ltoreq.x.ltoreq.3, R is a higher fatty acid group, an aromatic carboxylic acid group having 6 or more carbon atoms or a sulfuric acid group, and 0.ltoreq.y.ltoreq.10, and then cross-linking the mixture with an organic peroxide, sulfur, or a sulfur compound as a vulcanizing agent.
A flame-retardant composition prepared by:
A flame-retardant composition prepared by:
Dependencies are inferred from the claim text.