Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: A method for preparing an aliphatic chloroformate comprising, introducing a mixture of at least one aliphatic hydroxyl compound, phosgene, at least one solvent, and optionally at least one organic base into a flow reactor to obtain a unidirectional flowing reaction mixture. The at least one aliphatic hydroxyl compound comprises at least one aliphatic hydroxyl group. The unidirectional flowing reaction mixture is maintained at a temperature between about 0° C. and about 60° C. to produce a single product stream comprising an aliphatic chloroformate.

Abstract: The present invention relates to an interfacial method of preparing ester-substituted diaryl carbonates. The method includes the steps of: forming a reaction mixture comprising phosgene, an ester-substituted phenol, an organic solvent, and a catalyst selected from the group consisting of a tertiary amine catalyst and a phase transfer catalyst, said reaction mixture having an organic phase and an aqueous phase, wherein said aqueous phase has a brine strength; allowing the reaction mixture to react wherein during the reaction, (i) the aqueous phase has a pH, and the pH is adjusted, if necessary, by the addition of an alkali metal hydroxide solution in amounts such that the pH is greater than or equal to 9.

Abstract: Copolyorganosiloxanecarbonates are prepared by first preparing an oligomeric aromatic polycarbonate, such as an oligomeric bisphenol A polycarbonate, in the presence of a tertiary amine as the only catalyst species; contacting the oligomeric polycarbonate mixture with a polyorganosiloxane bis(aryl)chloroformate, such as the bischloroformate of hydroxy-terminated eugenol polydimethylsiloxane; and introducing phosgene and/or chain termination agent either continuously or in stages. A feature of the process is the presence of dihydroxyaromatic compound in only one charge, at the beginning. The products have excellent physical properties, including transparency.