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

1988-04-08

1989-03-21

Anderson, Harold D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549 17, C07D33908

Patent

active

048144665

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:
Pebalk, D. V. et al., "Electron-Acceptor Properties of Aromatic Dianhydrides", Dokl. Akad. Nauk SSSR (1977) 236(6), pp. 1379-1382 (U.S.S.R.).
Pebalk, D. V., et al., "Spin Density Distribution in Anion Radicals of Aromatic Tetracarboxylic Acid Dianhydrides", Dokl. Akad. Nauk SSSR (1979) 244(5), pp. 1169-1173 (U.S.S.R.).

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