Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1989-08-29
1992-10-20
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528 26, 528 33, 528 38, 528125, 528128, 528170, 528172, 528173, 528176, 528183, 528185, 528188, 528220, 528229, 528350, 528351, 427387, C08G 6926, C08G 7310, C08G 7704
Patent
active
051571072
ABSTRACT:
A polymeric acid is synthesized by the ring-opening poly-addition reaction using a biphenyl tetracarboxylic acid as a tetracarboxylic acid moiety and an aromatic diamine, particularly p-phenylene diamine, as a diamine moiety. An aromatic polyimide resin layer possessing a highly desirable heat-resisting property as a heat-resistant insulating coating material and excelling in adhesive strength relative to a substrate is obtained by adjusting the polymeric acid in viscosity with a suitable organic solvent, applying the resultant polyamic acid on a substrate, and firing the applied layer of the polyamic acid. The substrate, for example, is a conductor layer formed as with copper and used as a multi-layer wiring board for hybrid IC's. In a thermal head which is obtained by forming an insulating layer on a metallic substrate and superposing a multiplicity of heat-generating resistors and conductors connected severally to the heat-generating resistors on insulating layer, the aforementioned aromatic polyamide resin layer is formed on the metallic substrate. This aromatic polyimide resin layer as an insulating layer in the thermal head withstands harsh working temperature conditions and adheres strongly to the metallic substrate. Thus, it manifests various outstanding effects.
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Nikaido Masaru
Okunoyama Hikaru
Ouchi Yoshiaki
Yanagibashi Katsumi
Hampton-Hightower P.
Kabushiki Kaisha Toshiba
Kight III John
Toshiba Chemical Corporation
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