High performance carbon fiber, process for production thereof, a

Details High performance carbon fiber, process for production thereof, a High performance carbon fiber, process for production thereof, a

1981-08-21

1982-08-31

McCamish, Marion

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Noninterengaged fiber-containing paper-free web or sheet...

264 292, 264 297, 4234476, 428367, 428401, 428408, 428902, B32B 3118

Patent

active

043472796

ABSTRACT:
A carbon fiber, a process for production thereof, and composite materials prepared therewith are described, wherein the carbon fiber has a single yarn diameter of from 2 to 6 microns and showing a strand knot strength of 7 kilograms or more when formed into a strand of 0.4.+-.0.01 gram per meter, which comprises subjecting a 0.1 to 0.6 denier acrylonitrile-based fiber having a strength of 6 grams per denier or more to a preoxidation treatment wherein the acrylonitrile-based fiber is treated under such tension as to provide a shrinkage of at least 3% until the equilibrium water content reaches 5%, and (b) a second preoxidation treatment wherein the acrylonitrile-based fiber is treated under such tension as to provide a shrinkage of at least 1%, said preoxidation treatment is conducted in an oxidizing atmosphere having a temperature of from 240.degree. C. to 300.degree. C. while maintaining the relation between the preoxidation treatment time (t) (minutes) and average preoxidation treatment temperature (T) (.degree.C.) satisfying the equation (1):

REFERENCES:
patent: 4100004 (1978-07-01), Moss

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