Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1992-06-08
1993-11-09
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528126, 528128, 528171, 528172, 528173, 528174, 528176, 528183, 528185, 528188, 528220, 528229, 528350, 528353, C08G 7310, C08G 6926, C08G 802
Patent
active
052603881
ABSTRACT:
A heat-resistant and thermoplastic polyimide which has low dielectric characteristics and recurring structural units of the following formula ##STR1## wherein R is a tetravalent radical having from 2 to 27 carbon atoms and selected from the group consisting of an aliphatic radical, alicyclic radical, monoaromatic radical, condensed polyaromatic radical and noncondensed aromatic radical connected each other with a direct bond or a bridge member; aromatic diamines which are useful for the raw material monomers of the polyimide and have following formulas: ##STR2## and ##STR3## and a process for preparing the polyimide of the above formula by reacting these aromatic diamines with a tetracarboxylic dianhydride in the presence of an aromatic dicarboxylic anhydride or aromatic monoamine, and successively thermally or chemically imidizing the resultant polyamic acid.
REFERENCES:
patent: 3959350 (1976-05-01), Rogers
patent: 4065345 (1977-12-01), Progar et al.
patent: 4959440 (1990-09-01), Tamai
CA 70(26:116221x.
CA 92(20):164327n.
Ishihara Yuko
Okawa Yuichi
Tamai Shoji
Yamaguchi Akihiro
Yamaguchi Keizaburo
Hampton-Hightower P.
Kight III John
Mitsui Toatsu Chemicals Incorporated
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