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:
Nov. 30, 2004
Filed:
Aug. 27, 2003
Applicant:
Inventors:
Masahiro Iwahara, Yamaguchi, JP;
Tetsuya Saruwatari, Yamaguchi, JP;
Assignee:
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 3/916 ;
U.S. Cl.
CPC ...
C07C 3/916 ;
Abstract
Provided are a catalyst of high activity and good heavy substance resistance and alcohol resistance for production of bisphenols, and a method for producing bisphenols with the catalyst. The catalyst is a sulfonic acid-type cation-exchange resin modified with (a) a pyridinealkanethiol and (b) an aminoalkanethiol and/or a thiazolidine; and the method comprises reacting a phenol and a ketone in the presence of the catalyst for producing bisphenols.