Patent Number: 6,294,642

Title: Continuous method for manufacturing polycarbonate

Abstract: To provide a method with which a polycarbonate can be manufactured efficiently without any pipe clogging or foreign material admixture in the course of the continuous manufacture of a polycarbonate. A continuous method for manufacturing a polycarbonate, characterized in that, in the continuous manufacture of a polycarbonate by transesterification from a dihydroxy compound and a carbonic diester, the crystallization of a polycarbonate lower polycondensate produced in the intermediate stage of a polycondensation reaction whose intrinsic viscosity (IV) measured at 20.degree. C. in methylene chloride is between 0.1 and 0.4 dL/g is suppressed by setting the temperature to be at least 230.degree. C. on the surface of the reactor equipment in contact with the polycarbonate lower polycondensate.

Inventors: Shimoda; Tomoaki (Ichihara, JP), Sakashita; Takeshi (Ichihara, JP)

Assignee: General Electric Company

International Classification: C08G 64/20 (20060101); C08G 64/30 (20060101); C08G 64/00 (20060101); C08G 064/00 ()

Expiration Date: 09/25/2018