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:
Jun. 22, 1993
Filed:
Apr. 29, 1992
Applicant:
Inventors:
Kwan-Yue A Jen, Old Bridge, NJ (US);
Terence Moran, Tuscaloosa, AL (US);
Assignees:
Instituto Guido Donegani, Milan, IT;
Enichem America, Inc., Monmouth Junction, NJ (US);
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C07C / ; C07C / ; C08F / ;
U.S. Cl.
CPC ...
558268 ; 544 35 ; 544 69 ; 544106 ; 544229 ; 546 13 ; 548110 ; 549-4 ; 558198 ; 558277 ;
Abstract
A melt transesterification process for the production of polycarbonates, wherein at least one bis(aryl)carbonate is reacted with at least one dihydric phenol in the melted state, in the presence of a transesterification catalyst comprising at least one heterocyclic borate salt of the formula: