Process for preparing a carbon fiber of high strength

Details Process for preparing a carbon fiber of high strength Process for preparing a carbon fiber of high strength

1985-10-15

1990-05-15

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Filaments

264182, 264206, 2642107, 2642108, 26421115, 264233, D01F 922

Patent

active

049256041

ABSTRACT:
A carbon fiber of high strength is disclosed, each filament of which is substantially circular in its cross-section but which has circumferential ruggedness which extends in parallel to an axis of the filament to form pleats. The ruggedness has a depth of more than 0.1 .mu.m.
The carbon fiber is prepared by extruding a spinning solution of an aqueous polyacrylonitrile/pure zinc chloride solution of a specified polymer content into a coagulating bath at a specified draft ratio, followed by washing, drying and stretching at a total stretching ratio of 10-20 folds to form a precursor which is then subjected to conventional stabilizing and carbonizing steps.

REFERENCES:
patent: 2670268 (1954-02-01), Stanton et al.
patent: 2917806 (1959-12-01), Spence et al.
patent: 3121765 (1964-02-01), Kanda et al.
patent: 3485913 (1969-12-01), Yamada et al.
patent: 3523150 (1970-08-01), Vigneault
patent: 3904716 (1975-09-01), Moreton et al.
patent: 4448740 (1984-05-01), Sawanishi et al.

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