General Electric Company

Ken Tamada

Takato Kimura

James Anthony Cella

Tomoaki Shimoda

Hans-Peter Brack

Dennis Karlik

Akio Kanezawa

Akio Ikeda

Hendricus Franciscus Zirkzee

Lina Prada

Satoshi Omori

A process for preparing an end-capped polycarbonate comprises melt reacting an aromatic dihydroxy compound, a carbonic acid diester, and optionally a catalyst in a prepolymerization vessel to form a polycarbonate product; transferring the polycarbonate product from the prepolymerization vessel; mixing the polycarbonate product with an end-capping agent under hermetic seal at a pressure of at least about 760 mm Hg; and transferring the polycarbonate product and end-capping agent mixture to a postpolymerization vessel to endcap the polycarbonate product. An apparatus for preparing an end-capped polycarbonate comprises a prepolymerization vessel having and inlet and an outlet; a postpolymerization vessel having an inlet and an outlet; a mixer in fluid communication with the outlet of the prepolymerization vessel and the inlet of the postpolymerization vessel; and a charging port through which an end-capping agent is charged to the mixer, wherein the mixer is hermetically sealed at greater than or equal to 760 mm Hg.

Process for preparing polycarbonate and apparatus for preparing polycarbonate

Apparatus for manufacturing polycarbonate

Growing community of inventors

Ichihara, Japan

Ken Tamada