Process for the production of polycarbonate

Details Process for the production of polycarbonate Process for the production of polycarbonate

Filed on

1996-09-18

Date issued

1997-12-09

Examiner

Mosley, Terressa

Patent Class

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

SubClass

Synthetic resins

SubSubClass

From phenol, phenol ether, or inorganic phenolate

Other Related Categories

528176, 528180, 528190, 528191, 528193, 528194, 528198, 528200, 528202, C08G 6400

Type

Patent

Status

active

Patent number

056962223

Description

ABSTRACT:
A process for the production of a terminal-blocked aromatic polycarbonate by melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding a specific carbonate or carboxylic ester after a polycarbonate formed has an intrinsic viscosity of at least 0.3 dl/g, to form a terminal-blocked polycarbonate having an intrinsic viscosity which is greater than, or smaller than, the intrinsic viscosity of the polycarbonate formed before the addition by 0.1 dl/g at the most; and a process for the production of a polycarbonate having an increased intrinsic viscosity by melt-polycondensing an aromatic dihydroxy compound and diphenylcarbonate, the process comprising adding a specific diaryl carbonate or dicarboxylic diaryl ester after a polycarbonate formed has an intrinsic viscosity of at least 0.3 dl/g, to form a polycarbonate having an intrinsic viscosity greater than the intrinsic viscosity of the polycarbonate formed before the addition by more than 0.1 dl/g.

REFERENCES:
patent: 4310656 (1982-01-01), Brunelle
patent: 4323668 (1982-04-01), Brunelle
patent: 4329443 (1982-05-01), Brunelle

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