The Furukawa Electric Co., Ltd.

Riken Technos Corporation

Ube Industries, Inc.

Dai Hashimoto

Masaki Nishiguchi

Hitoshi Yamada

Kazuhiko Kobayashi

Michihisa Tasaka

Kiyoshi Saito

Kouji Iwata

Shoji Yamamoto

Ryoji Ohno

Shinzo Saito

Yoshihiro Inuizawa

Zensuke Iwata

Shinnichi Kishimoto

Ken Okubo

Yasuhiro Kamei

Shinichi Irie

There is disclosed a fire-retardant resin composition, which comprises: a thermoplastic resin component (A) comprising (a) a block copolymer mainly made of a vinyl aromatic compound and a conjugated diene compound as its constitutional components, and/or a hydrogenated block copolymer of the block copolymer, (b) a nonaromatic-series softener for rubber, (c) an ethylene/&#x3b1;-olefin copolymer, and (d) a polypropylene resin; and (e) an organic peroxide, (f) a (meth)acrylate-series and/or allyl-series crosslinking aid, and a metal hydrate (B), wherein a specific amount of the metal hydrate (B) to be used is a metal hydrate being pretreated with a silane coupling agent, and the fire-retardant resin composition is a mixture of the above formulation that is heated and kneaded at a temperature equal to or higher than the melting temperature of the (A). There is also disclosed a wiring material and other molded parts, in which the resin composition is utilized.

Fire-retardant resin composition and molded part using the same

An insulated wire, in which a conductor is coated with a crosslinked structure of a composition that comprises 150 to 300 parts by weight of a metal hydrate, 1 to 6 parts by weight of a phenol-series antioxidant, and 12 to 30 parts by weight of a thioether-series antioxidant, to 100 parts by weight of a base resin containing ethylene/vinyl acetate copolymer, and the content of vinyl acetate in the base resin is 40 wt % or more.

Insulated wire

A fire-retardant resin composition, comprising: a thermoplastic resin component (A) of (a) a (hydrogenated) block copolymer mainly made of a vinyl aromatic compound and a conjugated diene compound, (b) a nonaromatic-series softener for rubber, (c) an ethylene/&agr;-olefin copolymer, (d1) an ethylene copolymer with either/vinyl acetate (meth)acrylic acid or meth/acrylate, (e) a polypropylene resin, and (f) a modified polyethylene resin; and (g) an organic peroxide, (h) a (meth)acrylate-series and/or allyl-series crosslinking aid, and a metal hydrate (B), wherein a specific amount of the metal hydrate (B) is one pretreated with a silane coupling agents.

There is disclosed a cable having a covering layer on the outside of a multicore stranded wire composed of plural insulated conductors that are intertwined, wherein at least an outermost layer of the covering layer is made of a crosslinked product of a resin composition containing (a) 10 to 60% by weight of a polyamide elastomer made up of a block copolymer whose hard segment is a polyamide, (b) 5 to 60% by weight of a thermoplastic polyurethane resin, (c) 10 to 60% by weight of a thermoplastic polyester elastomer, and (d) 0 to 20% by weight of a thermoplastic styrene elastomer. The airtightness and the watertightness at the interface between the cable and a molded body are kept for extended periods without taking any particular sealing measures. The corrosion of the conductors in the cable and the deterioration of the performance of the connected parts of machinery and tools can be prevented, and the cable has excellent water resistance.

Cable

A method of manufacturing an electric wire insulated with a foamed plastic. The method includes steps of introducing a foaming agent into a fluororesin in a molten state to allow the foaming agent to dispersed in the molten resin, and extruding the molten resin having the foaming agent dispersed therein onto a conductor wire to allow foaming. A fluorine-based foaming agent contains as a main component at least one kind of a fluorocarbon having a molecular weight of about 338 to 488 is used as a foaming agent.

Method of manufacturing electric wire insulated with foamed plastic

There is disclosed a fire-retardant resin composition, comprising a polypropylene-series resin (a), a modified polyethylene modified with an unsaturated carboxylic acid or its derivative (b), a metal hydrate (c), and an ethylene-series copolymer (d), in a specific ratio; and an electric wire with a cover layer formed on the circumference of a conductor, in which the cover layer is composed of a composition prepared by blending (c) a metal hydrate with, in a specific ratio, a resin mixture, containing (a) a polypropylene-series resin, (b) a modified polyethylene, and (d) an ethylene-series copolymer. The fire-retardant resin composition is excellent in tensile strength, heat resistance, extrudability, and moldability. The covered electric wire is excellent in electric-wire properties and good in the end workability.

Fire-retardant resin composition and a covered electric wire

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Ichihara, Japan

Dai Hashimoto