Kuraray Co., Ltd.

Eiichirou Nakamura

Kazuhiko Tanaka

Masao Kawamoto

Kiyoshi Hirakawa

Shoji Asano

Yoshiteru Matsuo

A composite fiber having a single filament fineness of not more than 8 deniers and comprising:

Composite fiber containing inorganic fine powder

A highly oriented, undrawn, conductive, composite filament is provided, which is white or colorless and has antistatic properties durable over a long period when clothing utilizing the fiber are actually put on and washed. The filament is a sheath-core composite filament comprising a sheath of a fiber-forming thermoplastic polymer (A) and a core of a composition (B) comprising a conductive material which comprises a conductive metal oxide and a thermoplastic polyamide, having a core resistance of not more than 9.times.10.sup.10 .OMEGA./cm.multidot.filament, the composite filament maintaining a critical elongation--an elongation reached in the course of extending a composite filament at which the core resistance exceeds 1.times.10.sup.11 .OMEGA./cm.multidot.filament at a D.C. voltage of 1 kV--of at least 5% and a shrinkage in hot water at 100.degree. C. of not higher than 20%. Such fiber can be obtained by conducting high orientation melt spinning at a rate of at least 2,500 m/min while selecting a polyamide as the core component to contain the white or colorless conductive material and having the composition previously dried to a moisture content of 100 to 1,200 ppm.

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Takatsuki, Japan

Eiichirou Nakamura