The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 1988
Filed:
Apr. 24, 1987
Toru Koyama, Hitachi, JP;
Hiroko Ohayashi, Hitachi, JP;
Junichi Katagiri, Ibaraki, JP;
Motoyo Wajima, Hitachi, JP;
Junji Mukai, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A thermosetting resin composition comprising (a) a polyfunctional maleimide, (b) at least one member selected from the group consisting of alkenylphenols and alkenylphenol ethers, and (c) an allyl ester of polyvalent carboxylic acid, or cyanuric or isocyanuric acid and a prepolymer obtained by preliminarily heating the thermosetting resin composition can be used as a solventless type varnish for impregnating, e.g. electric windings, or for preparing a prepreg, and can give a cured product with heating at 120.degree.-250.degree. C. having excellent heat resistance of class C (180.degree. C. or higher) and electrical insulating properties.