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:
Apr. 12, 1994
Filed:
Aug. 09, 1993
Applicant:
Inventors:
Klaus Berg, Krefeld, DE;
Hans-Josef Buysch, Krefeld, DE;
Alfred Eitel, Dormagen, DE;
Gerhard Fennhoff, Willich, DE;
Otto Immel, Krefeld, DE;
Ralf Pakull, Cologne, DE;
Bernhard Wehrle, Langenfeld, DE;
Claus Wulff, Krefeld, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568727 ; 568722 ; 568723 ; 568728 ;
Abstract
The invention relates to a process for the production of bisphenols from acetone and phenols in the presence of sulfonic acid ion exchanger resins modified with alkyl-SH groups, in which 0.6 to 5% by weight H.sub.2 O is added to the mixture of phenol and acetone before the reaction.