Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1990-01-30
1992-02-25
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
524600, 524879, 528176, 528288, 528322, 528342, 528350, 528352, C08G 6926, C08G 6308, C08G 7500, C08L 6700
Patent
active
050915053
ABSTRACT:
Polyimides having a high thermal and oxidative stability are prepared by reacting a mixture of monomers comprising (a) a dialkyl, trialkyl, or tetraalkylester of an aromatic tetracarboxylic acid, (b) an aromatic diamine, and (c) an end cap compound. The ratio of (a), (b), and (c) is chosen so that upon heating the mixtures, low molecular weight prepolymers are formed, the prepolymers having only one end cap radical and being suitable for chain extension and crosslinking to form high molecular weight, thermally stable polyimides. Upon heating, the prepolymers form polyimide resins, which can have T.sub.g in excess of 600.degree. F. and superior physical properties.
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Cheng Paul G.
Serafini Tito T.
Ueda Kenneth K.
Wright Ward F.
Goldstein Sol L.
Kight III John
Mosley T.
Sheldon Jeffrey G.
TRW Inc.
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