Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1991-07-25
1993-03-16
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
524 27, 525421, 525422, 528125, 528126, 528322, 528342, 528350, 528353, C08G 7902
Patent
active
051945657
ABSTRACT:
The imidization temperature of poly(amide-acid) compositions derived from tetracarboxylic acid dianhydrides can be lowered by use of a bis(aminophenoxyphenyl) phosphine oxide in the diamine component which is reacted with the dianhydride. These homo- or copolyimides can be cyclized without use of catalysts or excessive temperature which can product undesired side reactions. Tough film forming materials can be produced which show excellent thermo-oxidative stability and high char yields even at 800.degree. C. in air.
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Gungor Attila
McGrath James E.
Fennelly Richard P.
Kight III John
Morris Louis A.
Virginia Tech Intellectual Properties Inc.
Wright Shelley
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