High tenacity and high toughness acrylic sulfide fibers, a process for production thereof, and composite materials prepared by using it
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United States of America Patent
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Mar 26, 1996
Issued Date -
N/A
app pub date -
Sep 25, 1989
filing date -
Apr 14, 1986
priority date (Note) -
Expired
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Abstract
The present invention relates to acrylic sulfide fibers whose tensile strength is at least 3.5 g/d, toughness expressed by TE.sup.1/2 product of tensile strength (T g/d) and a square root of tensile elongation (E %), is higher than 10 and sulfur content is higher than 0.5 weight %, a process for producing acrylic sulfide fibers characterized by heating acrylic fibers whose tensile strength is at least higher than 7 g/d in sulfur-containing atmosphere, and composite materials being reinforced with above described acrylic sulfide fibers. Acrylic sulfide fibers obtained have high tenacity and high toughness as well as excellent heat resistance, anti-flammability and alkali resistance. Therefore, above described acrylic sulfide fibers are useful for such applications as heat resistant and flame resistant spun-woven products, reinforcing cement cured in an autoclave and abrasive materials as asbestos substituting fibers.
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