Method for preparing tenacity and modulus polyacrylonitrile fiber
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United States of America Patent
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-
Nov 28, 1989
Issued Date -
N/A
app pub date -
Sep 18, 1986
filing date -
Dec 5, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Polyacrylonitrile (PAN) fibers are prepared by forming a 2-15 weight % solution of PAN of M.sub.w at least 500,000, extruding, cooling to below the gel temperature, extracting and drying. At least one of the gel fiber, the fiber containing extraction solvent and the dried gel is stretched. The product PAN fibers have a M.sub.w at least 500,000 (e.g. 1,000,000-4,000,000 or 1,500,000-2,500,000), a tenacity at least 5 g/den (e.g., at least 7 g/den) and a secant modulus at least 100 g/den (e.g. at least 125 g/den).
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