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:
Feb. 01, 1983
Filed:
Jul. 09, 1980
Applicant:
Inventors:
Gerhard Friedhofen, Krefeld, DE;
Volker Serini, Krefeld, DE;
Rainer Neumann, Krefeld, DE;
Dieter Freitag, Krefeld, DE;
Hans-Helmut Schwarz, Krefeld, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528196 ; 528198 ; 528204 ;
Abstract
This disclosure relates to the processes for producing polycarbonates from specific crude bisphenols. The bisphenols are characterized in that immediately after their preparation they are subjected to (i) separation, of excess phenols and low-boiling substances, by means of an evaporator, and (ii) removal of monophenols by desorption. The invention also relates to high-molecular weight aromatic polycarbonates made of crude bisphenols and their use in a variety of applications.