Processing for maximizing the level of crystallinity in linear a

Details Processing for maximizing the level of crystallinity in linear a Processing for maximizing the level of crystallinity in linear a

1990-04-30

1991-10-29

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528126, 528128, 528172, 528173, 528179, 528182, 528188, 528220, 528222, 528224, 528229, 528351, 528353, 525436, C08G 7310

Patent

active

050617834

ABSTRACT:
The process of the present invention includes first treating a polyamide-acid (such as LARC-TPI polyamide-acid) in an amide-containing solvent (such as N-methylpyrrolidone) with an aprotic organic base (such as triethylamine), followed by dehydrating with an organic dehydrating agent (such as acetic anhydride). The level of crystallinity in the linear aromatic polyimide so produced is maximized without any degradation in the molecular weight thereof.

REFERENCES:
patent: 3179630 (1965-04-01), Endrey
patent: 3242136 (1966-03-01), Endrey
patent: 3663728 (1972-05-01), Hoback et al.
patent: 4687836 (1987-08-01), Ibi et al.

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