Process for producing polycarbonate

Details Process for producing polycarbonate Process for producing polycarbonate

1995-04-07

1997-03-11

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528481, 528502R, 526 65, C08G 6430, C08G 6378

Patent

active

056102623

ABSTRACT:
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 in 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.

REFERENCES:
patent: 5418314 (1995-05-01), Yamoto et al.
patent: 5432250 (1995-07-01), Yamato et al.

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