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US 4,535,027 AGranted
High strength polyacrylonitrile fiber and method of producing the same
AssigneeJapan Exlan Company Limited
InventorsToshiyuki Kobashi, Seiji Takao
Life of this patent
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Abstract
Polyacrylonitrile (PAN) fiber of high strength (tensile strength.gtoreq.20 g/d) produced from a polymer composed mainly of acrylonitrile (AN) and having a weight average molecular weight not less than 400,000, and a method of producing said fiber characterized by a multistage stretching step and a drying step under particular conditions.
Claims1
A polyacrylonitrile fiber having a tensile strength not less than 20 g/d, and produced from a polymer composed mainly of acrylonitrile and having a weight average molecular weight not less than 400,000.
Dependencies are inferred from the claim text.