Polyamide acid composition for preparing polyimide and process f

Details Polyamide acid composition for preparing polyimide and process f Polyamide acid composition for preparing polyimide and process f

1982-09-29

1984-06-12

Lee, Lester L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524210, 528188, 524218, 524233, 524284, 524285, 524287, 524290, 524299, 524317, 524320, 524356, 524358, 524359, 524360, 524361, 524362, 524600, 528125, 528126, 528128, 528172, 528179, 528182, 528207, 528208, 528220, 528224, 528229, 528350, 528351, 528352, 528353, C08G 7310, C08K 507, C08K 516, C08K 520

Patent

active

044542763

ABSTRACT:
A polyamide acid composition for preparing a polyimide which can extend the pot life of the composition comprising a solution of a polyamide acid in an organic solvent, the polyamide acid being a precursor of the polyimide, a dehydrating agent, a catalyst and a pot life extending agent which can lower a rate of conversion of the polyamide acid to the polyimide, and the process for preparing the polyimide from said polyamide acid composition. According to the present invention the pot life can be extremely extended to give the composition an enough flowability for a long time without reducing the excellent properties such as a heat resistance and an electric insulation of the obtained polyimide.

REFERENCES:
patent: 3541036 (1970-11-01), Libackyi
patent: 3898199 (1975-08-01), Biensan et al.
patent: 4183835 (1980-01-01), Yamaguchi et al.

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