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. 19, 1991
Filed:
Apr. 02, 1990
Applicant:
Inventors:
Seiichi Hino, Yokohama, JP;
Shoichi Satou, Sagamihara, JP;
Kouji Koura, Yokohama, JP;
Osamu Suzuki, Yokohama, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ; C08G / ; C08F / ;
U.S. Cl.
CPC ...
528353 ; 528125 ; 528126 ; 528220 ; 528229 ; 528351 ; 526262 ;
Abstract
A method for producing an imide oligomer soluble in an organic solvent by reacting three components of an aromatic tetracarboxylic acid or its derivative, an aromatic diamine and an end-capping agent, wherein the aromatic diamine is a condensation product of o-ethylamiline with formaldehyde, and the end-capping agent is an ethynyl phthalic acid of the formula: ##STR1## wherein R is a hydrogen atom or a monovalent group selected from the group consisting of an aliphatic group, an alicyclic group and an aromatic group, or its derivative.