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:
Aug. 26, 2014
Filed:
Dec. 01, 2008
Applicants:
Takeshige Nakayama, Ube, JP;
Seiichirou Takabayashi, Ube, JP;
Tooru Murakami, Ube, JP;
Inventors:
Assignee:
UBE Industries, Ltd., Ube-Shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08L 79/08 (2006.01); C08G 73/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
Disclosed is a process for producing a polyamic acid solution by reacting a diamine component consisting essentially of 20 mol % to 80 mol % of p-phenylenediamine and 80 mol % to 20 mol % of diaminodiphenyl ether with a tetracarboxylic acid component consisting essentially of 10 mol % to 60 mol % of 2,3,3',4′-biphenyltetracarboxylic dianhydride and 90 mol % to 40 mol % of 3,3′,4,4′-biphenyltetracarboxylic dianhydride in a solvent, comprising: