Preparation of polyimide powder

Details Preparation of polyimide powder Preparation of polyimide powder

1982-06-04

1983-11-01

Lee, Lester L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528188, 528353, 528498, 528501, 528481, C08G 7310

Patent

active

044131178

ABSTRACT:
A polyimide powder particularly suitable for the production of moldings by high pressure sintering is prepared by mixing a solution of an aromatic polyimido-acid, obtained by a conventional process and having an intrinsic viscosity of 1.5 to 2.5 dl/g, in an aprotic dipolar organic solvent, with a water-entraining agent, heating the mixture to the boiling point of the entraining agent, azeotropically distilling off the water formed, filtering off the polyimide powder which precipitates, washing it if appropriate, and drying it.

REFERENCES:
patent: 3179631 (1965-04-01), Endrey
patent: 3422061 (1969-01-01), Gall
patent: 3607838 (1971-09-01), Strickrodt et al.
patent: 3619329 (1971-11-01), Wright
patent: 3708459 (1973-01-01), Lubowitz
patent: 3803081 (1974-04-01), Lubowitz
patent: 4075171 (1978-02-01), D'Alelio

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