Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From ketone or ketene reactant
Patent
1988-07-12
1990-12-18
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From ketone or ketene reactant
528176, 528188, 528229, 528353, C08C 200, C08G 1200, C08G 6300, C08G 6926
Patent
active
049787381
ABSTRACT:
High molecular weight polyimides are formed by polycondensation of 2,2-bis(4-aminophenyl) hexafluoropropane or 2,2-bis(3-aminophenyl) hexafluoropropane with one or more of bis-(3,4 dicarboxyphenyl) ether dianhydride; 3,3', 4,4' benzophenone tetracarboxylic acid dianhydride; 3,3', 4,4' diphenyl tetracarboxylic acid dianhydride and 2,2-bis(3,4 dicarboxyphenyl) hexafluoropropane dianhydride. Generally, the polymers of the present invention are characterized by a molecular weight of more than about 90,000.
Khanna Dinesh N.
Mueller Werner H.
Vora Rohitkumar H.
Ferrell Michael W.
Hampton-Hightower P.
Hoechst Celanese Corp.
Kight III John
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