Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1994-11-23
1997-01-07
Zirker, Daniel
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
428354, 428483, 4272088, B32B 712
Patent
active
055915221
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an insulating tape or sheet. More specifically, the present invention relates to an insulating tape or sheet suitably used, in particular, as an insulating material etc. for an insulated wire to be used for electric wiring in electric equipments, electronic equipments and automobiles, and indoor and outdoor wirings.
BACKGROUND ART
Conventionally, an insulating tape or sheet has been used for covering a conductor in an electric wire for insulating and protecting same. It comprises an adhesive layer formed on a polyester film, which is a substrate for the tape or sheet. Various adhesives such as polyolefins, thermosetting resins and polyester adhesives have been used for the aforementioned adhesive layer.
Of the aforementioned adhesives, polyolefin adhesives are advantageous in that they do not cure at room temperature, permitting easy handling thereof, and are most inexpensive in cost.
When an insulating tape or sheet having a polyolefin adhesive layer is used as an insulating material for an insulated wire to be used under severe conditions in the electric system of, for example, an automobile, however, the wire is susceptible to trouble due to the deformation and breakage of the wire, which is caused by a physical impact. When the wire is used in a bent state for a long time, moreover, the insulated wire experiences insulation failure due to the partial separation of the insulating layer from the adhesive layer in the insulating tape or sheet, or between the tape or sheet and the conductor, or due to the occurrence of cracks in the tape or sheet, posing problems to be solved.
DISCLOSURE OF THE INVENTION
Accordingly, the present invention aims at providing an insulating tape or sheet having a polyolefin adhesive layer permitting low production cost, which is usable as an insulating material for an insulated electric wire free of trouble or insulation failure even if it is used under severe conditions.
The present invention aims at providing an insulating tape or sheet useful as an insulating material for the above-mentioned insulated wire, the tape or sheet being particularly superior in adhesiveness under high temperature conditions (heat resistance) and in the presence of water (hot water) (water resistance).
The present invention further aims at providing an insulating tape or sheet useful as an insulating material for an insulated wire, which is superior in adhesiveness and voltage resistance characteristics when used under severe conditions of, for example, heat aging in a folded state and subsequent restoration to its original shape.
With the aim of achieving the above-mentioned objects, the present inventors have conducted various studies and found that the trouble such as breakage of wire and insulation failure of the insulated wire, which is composed of an insulating tape or sheet having a polyolefin adhesive layer as an insulating material, are ascribed to an inferior buckling resistance of the wire comprising such tape or sheet.
Further studies have revealed that the inferior buckling resistance is not caused by the polyolefin adhesive in the insulating tape or sheet or polyester film itself, but caused by the great difference in flexural modulus between the adhesive layer and the film layer, and that the above-mentioned objects can be achieved by setting the flexural modulus of the polyolefin adhesive layer for a specific range, which resulted in the completion of the present invention.
That is, the present invention relates to an insulating tape or sheet comprising a polyester film layer and a polyolefin adhesive layer having a flexural modulus of from 500 to 20000 Kf/cm.sup.2.
According to the present invention, an insulated wire having a superior buckling resistance and an insulating tape or sheet markedly inexpensive in cost can be provided.
In addition, the use of an anchor coating agent, comprising a silane-modified polyolefin resin or organic titanium compound as a main component, in the aforementioned tape or sheet as an anchor coa
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patent: 3794556 (1974-02-01), Young
patent: 4084035 (1978-04-01), Arpin et al.
patent: 4396650 (1983-08-01), Lange et al.
patent: 4743503 (1988-05-01), Lin et al.
patent: 5242757 (1993-09-01), Buisine et al.
Asano Ryuzo
Furukawa Kiyoshi
Honjo Hiromasa
Kamibayashi Hiroyuki
Miyahara Naotoshi
Mitsubishi Cable Industries Ltd.
Tokai Rubber Industries Ltd.
Zirker Daniel
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