Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1994-02-01
1995-12-26
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528 26, 528125, 528128, 528170, 528171, 528172, 528173, 528174, 528176, 528220, 528229, 528310, 528322, 528351, 525432, 525435, 525436, 525477, 524600, 524606, C08G 7310
Patent
active
054789184
ABSTRACT:
A polyimide precursor composition solution includes a tetracarboxylic acid component containing not less than 70 mol % of at least one selected from the group consisting of benzenetetracarboxylic acid and its reactive derivatives; a maleimide compound; and a diamine component containing not less than 70 mol % of 2,2'-substituted-4,4'-benzidine represented by the general formula (I) and siloxydiamine amounting to from 1 to 10 mol %. The tetracarboxylic acid component, the maleimide compound and the diamine component are dissolved in a solvent which is consisting essentially of .gamma.-butyrolactone. The amount of the tetracarboxylic acid component is substantially equivalent to that of the diamine component. The amount of the maleimide compound is from 5 to 30 wt % of the total weight of the tetracarboxylic acid and the diamine component. A polyimide coating film prepared from the polyamide precursor solution is very low in residual stress and superior in adhesion to a substrate, has a very flat surface and can be desirably treated by wet etching process with an etching solution which is not hazardous. ##STR1## wherein R are the same or different ones selected from the group consisting of CF.sub.3, CH.sub.3, C.sub.2 H.sub.5, OCH.sub.3, OC.sub.2 H.sub.5, Cl, Br and phenyl group.
REFERENCES:
patent: 5071997 (1991-12-01), Harris
patent: 5104946 (1992-04-01), Lee
patent: 5218083 (1993-06-01), Gerber et al.
Hasegawa Seiji
Maruta Masamichi
Moroi Yoshihiro
Nanai Hidehisa
Takahashi Hiroshi
Central Glass Company Limited
Hampton-Hightower P.
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