Organic compounds -- part of the class 532-570 series – Organic compounds – Carbonate esters
Patent
1998-06-01
1999-06-29
Ambrose, Michael G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbonate esters
558271, 558272, 558273, C07C 6800
Patent
active
059170778
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.
REFERENCES:
patent: 5231210 (1993-07-01), Joyce et al.
patent: 5284964 (1994-02-01), Pressman et al.
patent: 5312955 (1994-05-01), Pressman
patent: 5399734 (1995-03-01), King, Jr. et al.
U.S. Patent Application Serial No. 08/929,000, filed Sep. 13, 1997, by Eric J. Pressman et al., entitled "Method for Preparing Diaryl Carbonates Employing Hexaalkylguanidinium Halides".
U.S. Patent Application Serial No. 09/040,264, filed Aug. 27, 1997, by Eric J. Pressman et al., entitled "Method for Preparing Diaryl Carbonates Employing Hexaalkylguanidinium Halides".
Chaudhari Raghunath Vitthal
Gupte Sunil Purushottam
Kanagasabapathy Subbareddiar
Kelkar Ashutosh Anant
Radhakrishnan Subramaniam
Ambrose Michael G.
General Electric Company
Johnson Noreen C.
Stoner Douglas E.
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