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:
Sep. 28, 1993
Filed:
Jan. 25, 1991
Applicant:
Inventors:
Thomas D DuBois, Charlotte, NC (US);
Farid M Tranjan, Charlotte, NC (US);
Stephen M Bobbio, Wake Forest, NC (US);
Assignees:
UNC at Charlotte, Charlotte, NC (US);
MCNC, Research Triangle Park, NC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
528353 ; 528 45 ; 528 48 ; 528 50 ; 528125 ; 528126 ; 528128 ; 528129 ; 528170 ; 528173 ; 528179 ; 528183 ; 528185 ; 528188 ; 528189 ; 528220 ; 528222 ; 528229 ; 528342 ; 528351 ; 427379 ; 4273855 ;
Abstract
The invention comprises curing polyamic acid solutions into polyimide solutions by adding a hydrophilic reagent to a polyamic acid solution. The hydrophilic reagent is selected to have little or no reactivity with amines or carboxylic acids, and is of the type that will react with water to form by-products that shift the equilibrium between polyamic acid as a reactant and polyimide and water as products toward the production of polyimide.