Process for producing polycarbonate

Details Process for producing polycarbonate Process for producing polycarbonate

1992-11-18

1995-07-11

Michl, Paul R.

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

054322502

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 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.

REFERENCES:
patent: 3888826 (1975-06-01), Yamana et al.
patent: 4313870 (1982-02-01), Imai et al.
patent: 5097002 (1992-03-01), Sakashita et al.

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