Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
1999-11-08
2001-06-19
Edwards, N. (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S372000, C428S379000, C174S1200SR, C174S1210AR
Reexamination Certificate
active
06248446
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a non-halogenated flame-retarded covered wire which is used in a field such as motor vehicle wherein flame retardance is required especially.
2. Description of the Related Art
A thin layer covered wire for motor vehicle use is arranged in a narrow space inside a motor vehicle and is always in an environment of vibration, oil and the like. That is, the thin layer covered wire for motor vehicle use is required to bear the severe condition, which is not required for a general covered wire, and further flame retardance, lightweight, and recently halogen-free as an environmental problem measures are required.
A polyolefin covered wire having a covered layer including a large quantity of magnesium hydroxide as a non-halogen flame retardant has come into use for satisfying such a requirement.
The addition of a large quantity of magnesium hydroxide, however, lowers other properties such as abrasion resistance and oil resistance which are required for a covered wire for motor vehicle use. Therefore, it is difficult to reduce a thickness of an insulating cover layer to 200 &mgr;m which is applied to a polyvinyl chloride covered wire, and, at present, it is even difficult to make the thickness less than 300 &mgr;m, thereby leaving problems of arrangeability, weight and thickness.
SUMMARY OF THE INVENTION
In view of the foregoing, an object of the present invention is to provide a non-halogenated flame-retarded covered wire which is lightweight and is capable of diameter-reducing, wherein all of abrasion resistance, flame retardance, oil resistance, and bending resistance can be satisfied as a thin layer covered wire for motor vehicle use.
In order to achieve the above-described object, as a first aspect of the present invention, a non-halogenated flame-retarded covered wire includes: a conductor; and an insulating cover layer made up of a first layer directly put into contact with the conductor and a second layer arranged outside the first layer, wherein the first layer is made of a flame-retarded polyolefin composition with Shore D hardness of under 60 and Oxygen Index of 24% and over, the second layer is made of a polyolefin composition with Shore D hardness of 60 and over, and thicknesses of the first and second layers are 30 &mgr;m and over and between 65 &mgr;m and 150 &mgr;m, respectively.
As a second aspect of the present invention, in the structure with the above first aspect, a thickness of the insulating cover layer is 180 &mgr;m and over.
As a third aspect of the present invention, in the structure with the above first or second aspect, the polyolefin composition constituting the second layer does not have an inorganic filler nor an inorganic flame retardant.
As a fourth aspect of the present invention, in the structure with any one of the above first to third aspects, a flame retardant added to the flame-retarded polyolefin composition constituting the first layer is magnesium hydroxide.
As a fifth aspect of the present invention, a non-halogenated flame-retarded covered wire includes: a conductor; and an insulating cover layer made up of a first layer directly put into contact with the conductor and a second layer arranged outside the first layer, wherein the first layer is made of a flame-retarded polyolefin composition with Shore D hardness of under 60 and Oxygen Index of 24% and over, the second layer is made of a polyolefin composition with Shore D hardness of 60 and over, a thickness of the insulating cover layer is 180 &mgr;m and over, and a thickness of the second layer is between 65 &mgr;m and 150 &mgr;m.
As a sixth aspect of the present invention, in the structure with the above first or fifth aspect, the conductor is a soft copper stranded wire.
As described above, the non-halogenated flame-retarded covered wire in accordance with the present invention is excellent in abrasion resistance, flame retardance, oil resistance, and bending resistance, and simultaneously is capable of stable production. And, with all the above properties, the insulating cover layer of the non-halogenated flame-retarded covered wire can be thinner than the conventional one, whereby the wire can be lightened. Therefore, the non-halogenated flame-retarded covered wire in accordance with the present invention is exceedingly suitable for the thin layer covered wire for motor vehicle use.
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4918127 (1990-04-01), Adur et al.
patent: 36 06 683 (1987-09-01), None
patent: 43 00 795 (1994-07-01), None
patent: 1-302611 (1989-12-01), None
patent: 3-254015 (1991-11-01), None
patent: 10340639 (1998-12-01), None
patent: 10340635 (1998-12-01), None
Derwent Abstract ACC-No 1979-03034, 1979.*
Database WPI; Section Ch, Week 199430, Derwent Publications, Ltd., XP0021523221 (abstract only) & JP06 176631, Jun. 24, 1994.
Database WPI; Section Ch, Week 199146, Derwent Publications, Ltd., XP00215322 (abstract only) & JP03 226918, Oct. 7, 1991.
Kanamori Yasuo
Kikuchi Norio
Armstrong Westerman Hattori McLeland & Naughton LLP
Edwards N.
Gray J. M.
Yazaki -Corporation
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