Sabic Global Technologies B.v.

Aaron David Bojarski

Jorge A Garcia Agudo

Ignacio Vic Fernandez

Sergio Ferrer Nadal

Dwairath Dhar

Sivalingam Gunasekaran

Gines Cervantes Munoz

Ignacio Vic Fernández

Jorge A GARCÍA Agudo

Juan Francisco Ceron Munoz

Manuel Iglesias Moya

A method of preparing a polycarbonate composition in a polymerization system that includes a monomer mixing unit, an oligomerization section, and a polymerization section. The method includes melt polymerizing a dihydroxy compound with a diaryl carbonate compound in the presence of a quaternary phosphonium catalyst to produce the polycarbonate composition having a phosphorus-containing byproduct of at least one of the quaternary phosphonium catalyst or of the diaryl carbonate compound. The method further includes recycling the phosphorus-containing byproduct into the monomer mixing unit of the polymerization system and removing the polycarbonate composition from the polymerization system. The recycle stream has a phosphorus concentration of greater than or equal to 40 parts per million by weight.

Polycarbonate compositions with improved oxidation stability and methods of manufacturing the same

A method of preparing a polycarbonate composition, including: melt polymerizing in a polymerization unit a dihydroxy compound with a diaryl carbonate and removing a stream of color inducing species containing an isopropenyl phenyl-containing group from the polymerization unit, to form a polycarbonate composition, wherein the polycarbonate has a color inducing species containing an isopropenyl phenyl-containing group level below 170 ppm is provided.

Reduced color polycarbonate compositions, methods of manufacture, and articles thereof

Polymerization processes comprising melt polymerizing a carbonate and a dihydroxy compound in the presence of an amount of a beta organic catalyst so as to give rise to a polycarbonate product, wherein the amount of beta organic catalyst comprises at least one onium salt and also comprises triphenyl phosphonium oxide (TPPO), and wherein the TPPO represents less than about 0.3 weight % of the sum of the weights of the at least one onium salt and the TPPO in the amount of beta organic catalyst.

Control of organic impurities in polycarbonate synthesis

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Cartagena, Spain

Aaron David Bojarski