Perfluoroisopropylidene dianhydride and polyimides prepared ther

Details Perfluoroisopropylidene dianhydride and polyimides prepared ther Perfluoroisopropylidene dianhydride and polyimides prepared ther

1978-06-12

1980-04-01

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

2603452, 2603463, 528 70, 528 73, 528 74, 528125, 528172, 528185, C08G 7310

Patent

active

041962770

ABSTRACT:
This invention relates to a novel aromatic dianhydride and more particularly to the use of said dianhydride for the preparation of thermally stable high-molecular weight polymers including, for example, polybenzimidazoles, polypyrrones, polyimides, and the like. This dianhydride is obtained by reacting a stoichiometric amount of a disodium salt of 2,2-bis(4-hydroxyphenyl) hexafluoropropane with 4-chloro-N-phenylphthalimide to obtain an intermediate, 2,2-bis[4-(3,4-phenylphthalimidephenoxy)phenyl] hexafluoropropane, which is oxidized to the corresponding bis[4-(3,4-dicarboxyphenoxy)phenyl]perfluoroisopropylidene dianhydride.

REFERENCES:
patent: 3356648 (1967-12-01), Rogers
patent: 3879428 (1975-04-01), Heath et al.

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