9,9-bis-(3,4-dicarboxyphenyl)fluorene dianhydrides

Details 9,9-bis-(3,4-dicarboxyphenyl)fluorene dianhydrides 9,9-bis-(3,4-dicarboxyphenyl)fluorene dianhydrides

1990-12-26

1991-10-29

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549231, C07D30760

Patent

active

050618091

ABSTRACT:
The present invention relates to compositions of matter corresponding to the formula: ##STR1## wherein R.sub.1 through R.sub.4, inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms, an alkenyl group having from 2 to about 8 carbon atoms, amino, cyano or R.sub.1 and R.sub.1, R.sub.1 and R.sub.2, R.sub.2 and R.sub.3 or R.sub.3 and R.sub.4 may together form part of a cyclohydrocarbyl ring. The subject 9,9-bis(3,4-dicarboxyphenyl)fluorene dianhydrides demonstrate utility as reactants in the preparation of polyimides used in the fabrication of membranes for separating gaseous mixtures into their respective components.

REFERENCES:
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Kim, et al., "Reverse Permselectivity" of N.sub.2 over CH.sub.4 in Aromatic Polyimides, J. Appl. Poly. Sci., vol. 34, (1987), pp. 1767-1771.
Salame, "Prediction of Gas Barrier Properties of High Polymers," Polymer Eng. & Sci., vol. 26, (1986), pp. 1543-1546, No. 22.

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