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. 24, 1992
Filed:
Oct. 07, 1991
Applicant:
Inventors:
Assignee:
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
558274 ; 558277 ;
Abstract
A process for producing a diaryl carbonate in high yield and with high selectivity which comprises disproportionating an alkylaryl carbonate in the presence of a lead catalyst to produce a diaryl carbonate and a dialkyl carbonate and recovering the diaryl carbonate from the reaction products. Use of the lead catalyst is effective in avoiding corrosion problems normally caused by other catalyst systems.