Method of producing a foam-insulated electric wire using a blowi

Details Method of producing a foam-insulated electric wire using a blowi Method of producing a foam-insulated electric wire using a blowi

1993-07-01

1995-02-21

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 469, 264 53, 264DIG5, B29C 6722

Patent

active

053913353

ABSTRACT:
In producing a foam insulated electric wire having an insulating layer made of a polyolefin foam, a foaming agent is employed, which is a liquid mixture of at least two kinds of compounds selected from the group consisting of ethers, esters, ketones and saturated hydrocarbons having boiling points of 100.degree. C. or below, or a liquid mixture of at least one kind of compound selected from the group consisting of ethers, esters, ketones and saturated hydrocarbons having boiling points of 100.degree. C. or below and at least one kind of liquid compound selected from the group consisting of ethers, esters, ketones, saturated hydrocarbons and alcohols having boiling points higher than 100.degree. C. but not exceeding 150.degree. C. Thus, a foam insulating layer having a high cell content and a low deformation ratio become available. Since the foam insulating layer has a high cell content and a low deformation ratio, the foam insulating layer, if reduced in diameter, is hardly squeezed. Since the foaming agent is a liquid, it can be supplied in an exact amount. The obtained wire is useful as a core applied to a high-speed signal transmission cable, an under-carpet cable, etc.

REFERENCES:
patent: 4146562 (1979-03-01), Fukushima et al.
patent: 4182734 (1980-01-01), Takano et al.

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