Method for the production of polyimide powder

Details Method for the production of polyimide powder Method for the production of polyimide powder

1983-12-12

1984-08-07

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521157, 521160, 521183, 521 56, 528 73, 528182, 528228, 528353, C08J 902

Patent

active

044644892

ABSTRACT:
Spherical porous polyimide powder having an average particle diameter of 1 to 20 .mu.m which is infusible and insoluble in organic solvents is produced by polymerizing an aromatic tetracarboxylic acid dianhydride and an aromatic polyisocyanate in an organic solvent at a temperature of 100.degree. to 200.degree. C. and in the presence of a tertiary amine catalyst to form polyimide particles in the form of slurry, filtering or centrifuging said polyimide particles, and washing the resulting polyimide particles with an organic solvent.

REFERENCES:
patent: 3300420 (1967-01-01), Frey
patent: 4263410 (1981-04-01), Tung et al.

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