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Title:
FLAME RESISTING INSULATED WIRE
Document Type and Number:
Japanese Patent JPH03254015
Kind Code:
A
Abstract:

PURPOSE: To improve flame resistance and wear resistance by making an insulator in a 2-layer construction constituted of an internal layer and an external layer each having a specific composition and setting the ratio of thickness of the internal layer to the external layer within a specific range.

CONSTITUTION: An insulator is made up in a two-layer construction of an internal layer (a) and an external layer (b). The internal layer (a) is constituted of a composition of metal oxide and polyolefine at such a ratio as 50-150 parts by weight of metal oxide to 100 parts by weight of polyolefine. The external layer (b) is constituted of a composition of ethylene copolymer containing vinyl acetate, ester acrylate, etc., at 10wt.% or more and an admixture made up of metal hydroxide and calcium aluminate mixed at such ratio as 100 parts by weight of the ethylene copolymer to 100-300 parts by weight of the admixture. The insulator is made up such that the ratio of the external layer (b) to the internal layer (a) in thickness, b/a, becomes 5/95-50/50. According to a wire made up of an insulator composed as above, the wire is good in flame resistance and no halogen gas is generated at the time of combustion. Also, it holds a value which can fully satisfy the requirements for mechanical characteristics and water resistance.


Inventors:
YAMAMOTO YASUAKI
TANMACHI MASAMI
TAKAHATA NORIO
Application Number:
JP5253290A
Publication Date:
November 13, 1991
Filing Date:
March 02, 1990
Export Citation:
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Assignee:
HITACHI CABLE
International Classes:
C08K3/22; C08K3/24; C08K3/26; C08L23/00; H01B3/44; H01B7/295; (IPC1-7): C08K3/22; C08K3/24; C08L23/00; H01B3/44; H01B7/34
Domestic Patent References:
JPS59211914A1984-11-30
JPS6065059A1985-04-13
JPS6339939A1988-02-20
Attorney, Agent or Firm:
Takashi Matsumoto (1 person outside)