Production process for polyimide fibers

Details Production process for polyimide fibers Production process for polyimide fibers

1989-11-06

1991-02-19

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528183, 528185, 528188, 528189, 528352, 528353, 2641761, C08G 802

Patent

active

049945440

ABSTRACT:
A process for the production of polyimide fibers and polyimide fibers obtained by the process. The process includes thermal or chemical imidation of a polyamic acid which has been obtained by reacting a specific diamine and a particular tetracarboxylic dianhydride in the presence of a dicarboxylic anhydride represented by the following formula: ##STR1## wherein Z represents a divalent group selected from the group consisting of monocyclic aromatic groups, fused polycyclic aromatic groups and non-fused polycyclic aromatic groups with aromatic rings bonded together directly or via a crosslinking member.

REFERENCES:
patent: 4485140 (1984-11-01), Gannett et al.
patent: 4681928 (1987-07-01), Berger et al.
patent: 4725642 (1988-02-01), Gannett et al.

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