General Electric Company

Huntsman International LLC

Sunil Purushottam Gupte

Raghunath Vitthal Chaudhari

Ashutosh Anant Kelkar

Subbareddiar Kanagasabapathy

Eric James Pressman

Swaminathan Sivaram

Sunil Sadashiv Divekar

Bahram Moasser

Chilukuri Ver Avadhani

Bhalchandra Mahadeo Bhanage

Subramanian Ganapathy

Mohammed Shadbar Qureshi

Subramaniam Radhakrishnan

Process for the synthesis of polyurethane derivatives from aromatic polyamine compounds. The method involves the reaction of an aromatic polyamine compound with CO and Oin the presence of a catalyst comprising a Group VIII or lanthanide metal on a solid support and a halogenide promoter.

Process for the synthesis of polycarbamates

Polycarbonate oligomers are prepared by oxidative carbonylation of a dihydroxyaromatic compound such as bisphenol A in the presence of a catalyst comprising a Group VIII metal such as palladium, an inorganic and/or an organic co-catalyst, a halide source and an alcohol-free solvent comprising at least one liquid aromatic hydrocarbon, optionally in combination with a dipolar aprotic liquid such as N-methylpyrrolidinone. These oligomers may be further polymerized by melt polymerization to precursor polycarbonate oligomers which may be converted to high molecular weight polycarbonates by melt or solid state polymerization.

Method for preparing polycarbonates by oxidative carbonylation

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.

Method for preparing diaryl carbonates with improved selectivity

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Sunil Purushottam Gupte