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:
Mar. 08, 1988
Filed:
Sep. 24, 1986
Akihiro Kunimoto, Ube, JP;
Seiichirou Takabayashi, Ube, JP;
Ube Industries, Ltd., Yamaguchi, JP;
Abstract
An abrasive sheet having an excellent flexibility, mechanical strength and heat resistance comprises an aromatic imide polymer matrix and abrasive particles having an average size of 0.1 to 50 .mu.m and is prepared by evenly dispersing the abrasive particles in an organic polar solvent, mixing the resultant dispersion with a polymerization mixture consisting of an acid component comprising, as a major acid ingredient, a biphenyltetracarboxylic acid or an dianhydride thereof with a diamine component comprising an aromatic diamine, while polymerizing the acid and diamine components at 0.degree. C. to 80.degree. C. into an aromatic polyamic acid, forming the resultant dope dispersion into a thin layer and solidifying the thin layer while imidizing the aromatic polyamic acid into a corresponding aromatic imide polymer.