Core-in-sheath type aromatic polyamide fiber and process for producing the same
AssigneeTeijin Limited
InventorsTsutomu Nakamura, Yasuo Nakagawa, Osamu Kai, Keizo Shimada
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Abstract
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.
Claims7
A core-in sheath type aromatic polyamide fiber, comprising a core portion comprising an aromatic polyamide material and extending along the longitudinal axis of said fiber, and a sheath portion comprising the same aromatic polyamide material as that in said core portion and surrounding said core portion, said core portion being insoluble but said sheath portion being solution in N-methyl-2-pyrrolidone at a temperature of 35.degree. C., said fiber having been heat-treated in a dry atmosphere at a temperature of from 200.degree. to 390.degree. C.
Dependencies are inferred from the claim text.