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:
Nov. 29, 1988
Filed:
Dec. 15, 1986
Takahiko Sado, Tokyo, JP;
Hiroaki Mori, Tokyo, JP;
Ube Industries, Inc., Ube, JP;
Abstract
An aromatic polyimide laminate sheet having a relatively large thickness of 50 .mu.m or more comprises (1) at least one first film layer comprising a polymerization-imidization product of an acid component containing 80 to 100 molar % of at least one biphenyltetracarboxylic acid with an amine component containing 80 to 100 molar % of at least one aromatic diamine having two or more benzene rings, and having a glass transition point of 250.degree. C. to 350.degree. C.; and (2) at least one second film layer comprising an aromatic imide polymer, the first and second film layers being alternately laminated on and directly bonded to each other without using bonding material.