Poly amic acid system for polyimides

Details Poly amic acid system for polyimides Poly amic acid system for polyimides

2005-02-08

2005-02-08

Seidleck, James J. (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S128000, C528S176000, C528S179000, C528S183000, C428S457000, C428S458000, C428S473500, C524S600000, C524S606000

Reexamination Certificate

active

06852828

ABSTRACT:
A poly amic acid precursor containing a combination of tetrahydrofuran and N-methylpyrrolidinone as cosolvents is described. Utilizing the combination of tetrahydrofuran and N-methylpyrrolidinone allows for the removal of significant portions of the solvent during the formation of the polyimide. The removal of tetrahydrofuran and N-methylpyrrolidinone can be done without the use of preheating zones so as to allow for the large scale production of polyimide articles.

REFERENCES:
patent: 5177181 (1993-01-01), Rosenfeld et al.
patent: 6010791 (2000-01-01), Tan et al.
patent: 6133408 (2000-10-01), Chiu et al.

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