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:
Jul. 15, 1992
Applicant:
Inventors:
Assignee:
Teijin Chemicals, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528196 ; 528202 ;
Abstract
The present invention provides a process for producing a polycarbonate oligomer continuously, which comprises feeding (a) an aqueous alkali solution of a dihydric phenol and (b) phosgene into a tower type reactor from the bottom to react them in the reactor without using any organic solvent and discharging the reaction mixture from the top of the reactor. According to this process, an oligomer giving a polycarbonate of stable quality can be produced using a simple apparatus.
Ichihana, Hideyuki. (1993). Process for continuous production of polycarbonate oligomer (U.S. Patent No. 5248754). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5248754
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