Studies on the Synthesis of Polycabonates. III:Phosgenation of Bisphenol A

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In the formation of a monomer and a olygomer by the reaction of bisphenol A andphosgene, the effects of the rate of passing of phosgene, the concentration of caustic soda, the amount of phosgene and catalyst have been investigated. When a part of bisphenol A remained unreacted after the completion of introduction of phosgene, it was recognized that molecular weight of polymer obtained in the condensation polymerization reaction increased but its yield and the reproducibility of the reaction decreasd. Also, an increase in the rate of passing of phosgene retarded the next condensation-polymerization reaction and made the molecular weight distribution range narrow. By the addition of catalyst in the phosgenation period or a stepwise addition of sodium hydroxide during the introduction of phosgene, the consumption of phosgene and sodium hydroxide can be decreased to a considerable extent.