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. 20, 1990
Filed:
Feb. 07, 1989
Applicant:
Inventor:
Brent A Dellacoletta, Evansville, IN (US);
Assignee:
General Electric Company, Pittsfield, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528353 ; 528125 ; 528126 ; 528128 ; 528172 ; 528185 ;
Abstract
An improved solution polymerization process for the preparation of polyetherimides comprises prereacting an aromatic bis(ether anhydride) with an aromatic diamine, followed by the addition of phthalic anhydride end capping agent and further reaction to form an end capped prepolymer. The prepolymer is converted to polyetherimide. The improved process advantageously greatly reduces the formation of PAMI, an undesired byproduct.