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:
Jun. 29, 1999
Filed:
Jun. 01, 1998
Raghunath Vitthal Chaudhari, Pune, IN;
Sunil Purushottam Gupte, Pune, IN;
Ashutosh Anant Kelkar, Pune, IN;
Subbareddiar Kanagasabapathy, Pune, IN;
Subramaniam Radhakrishnan, Pune, IN;
General Electric Company, Schenectady, NY (US);
Abstract
Diaryl carbonates such as diphenyl carbonate are prepared by reaction of hydroxyaromatic compounds such as phenol with oxygen and carbon monoxide in the presence of a catalyst composition comprising a Group VIIIB metal such as palladium or a compound thereof, a bromide source such as a quaternary ammonium or hexaalkylguanidinium bromide and a polyaniline in partially oxidized and partially reduced form. The polyaniline is preferably halide-doped and in the form of a blend with a binder polymer containing ether or ester groups and a complex-forming salt.