Method for making thianthrene dianhydride and polyimides obtaine

Details Method for making thianthrene dianhydride and polyimides obtaine Method for making thianthrene dianhydride and polyimides obtaine

1988-11-21

1989-09-05

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528171, 528172, 528185, 528188, 528189, 528208, 528226, 528229, 4284735, C08G 7310

Patent

active

048640158

ABSTRACT:
A method is provided for making 9,10-dithiaanthracene-2,3,6,7-tetracarboxylic acid dianhydride. Polyimides having improved oxidative stability also are provided which can be made intercondensing organic diamine and the aforementioned dianhydride or a dianhydride mixture.

REFERENCES:
patent: 4716216 (1987-02-01), Takekoshi et al.
patent: 4724257 (1988-02-01), Aritomi et al.
patent: 4783522 (1988-11-01), Aritomi et al.
patent: 4808696 (1989-02-01), Takekoshi et al.

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