Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1989-12-12
1992-03-03
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 21, 528 23, 528125, 528126, 528128, 528173, 528176, 528183, 528185, 528188, 528220, 528229, 528351, 528352, 528353, C08G 7704, C08G 802, C08G 6926
Patent
active
050934538
ABSTRACT:
A high-temperature stable, optically transparent, low dielectric aromatic polyimide is prepared by chemically combining equimolar quantities of an aromatic dianhydride reactant and an aromatic diamine reactant, which are selected so that one reactant contains at least one Si(CH.sub.3).sub.2 group in its molecular structure, and the other reactant contains at least one --CH.sub.3 group in its molecular structure. The reactants are chemically combined in a solvent medium to form a solution of a high molecular weight polyamic acid, which is then converted to the corresponding polyimide.
REFERENCES:
patent: 4603061 (1986-07-01), St. Clair et al.
Chemical Abstract 92:147385n "Aromatic Polyimides Based Upon Bis(3,4-Dicarboxyphenyl)Dimethyl Silane Dianhydride", Koton, M. M. et al.
Pratt J. Richard
St. Clair Anne K.
St. Clair Terry L.
Administrator of the National Aeronautics and Space Administrati
Hampton-Hightower P.
Helfrich George F.
Kight III John
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