05432250 is referenced by 3 patents and cites 5 patents.

In a process for producing a polycarbonate by subjecting a dihydroxy compound and a diester of carbonic acid to melt polycondensation through transesterification, after a polycarbonate prepolymer is prepared in the first-stage reaction, polycondensation is conducted as the second-stage reaction at a residence time in the range of from 15 to less than 60 min or through the use of at least one paddle-type self-cleaning twin-screw extruder.

This process enables a colorless, transparent polycarbonate having a high molecular weight to be produced at a high efficiency on an industrial scale.

Title
Process for producing polycarbonate
Application Number
946335
Publication Number
5432250
Application Date
November 18, 1992
Publication Date
July 11, 1995
Inventor
Takaaki Kuwana
Hyogo
JP
Tatsuya Kanno
Hyogo
JP
Yutaka Fukuda
Hyogo
JP
Yasuhiro Oshino
Hyogo
JP
Tsutomu Yamato
Hyogo
JP
Agent
Flynn Thiel Boutell & Tanis
Assignee
Daicel Chemical
JP
IPC
C08G 63/78
C08G 64/30
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