Teijin Limited

Osamu Kai

Tsutomu Nakamura

Keizo Shimada

Hiroshi Fujie

Yasuo Nakagawa

Eiji Masunaga

Etuo Sumitani

Akiro Shimomai

An aromatic polyamide fiber having an excellent dyeing property has a core-in-sheath type structure, in which the core portion is insoluble and the sheath portion is soluble in N-methyl-2-pyrrolidone at 35.degree. C.

Core-in-sheath type aromatic polyamide fiber and process for producing

A wholly aromatic polyamide fiber which comprises a wholly aromatic polyamide and an organic phosphorus compound having one or more halogen atoms. The wholly aromatic polyamide has repeating units of which at least about 85 mol % are represented by the formula: ##STR1## The amount of the organic phosphorus compound having one or more halogen atoms is such as to provide a halogen atom content of 0.5% to 25.0% and a phosphorus atom content of 0.05% to 6.0% by weight of the wholly aromatic polyamide. The obtained wholly aromatic polyamide fiber has excellent flame-resistance, good color and good fiber properties.

Flame resistant wholly aromatic polyamide fibers

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Iwakuni, Japan

Osamu Kai