Method for preparing high molecular weight polycarbonate

Details Method for preparing high molecular weight polycarbonate Method for preparing high molecular weight polycarbonate

2006-08-01

2006-08-01

Boykin, Terressa (Department: 1711)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C422S131000, C428S411100, C428S412000, C528S198000

Reexamination Certificate

active

07084232

ABSTRACT:
The present invention relates to a process for preparing high molecular weight polycarbonate resin, particularly to a process for preparing high molecular weight polycarbonate resin, which conducts condensation polymerization of low molecular weight amorphous polycarbonate prepolymer prepared by transesterification of dialkyl(aryl)carbonate and aromatic hydroxy compound and solid state polymerization within short time to increase molecular weight. The present invention introduces condensation polymerization to lower mole fractions of arylcarbonate existing in unreacted diarylcarbonate, end groups of reaction by products of polymerization degree less than 3, and polycarbonate prepolymer obtained by transesterification, and thus can maximize molecular weight increase of polycarbonate after solid state polymerization and remarkably reduce time required for preparing polycarbonate of the same molecular weight. In addition, since the present invention does not use toxic substance phosgene, it has no danger and it can prevent deterioration, and it can prepare high molecular weigh polycarbonate that can be used for injection and extrusion.

REFERENCES:
patent: 5981051 (1999-11-01), Motegi et al.
patent: 6288203 (2001-09-01), Shishikura et al.
patent: 6365702 (2002-04-01), Hait et al.
patent: 0338085 (1989-10-01), None
patent: 0848030 (1998-06-01), None
patent: 1245607 (2002-10-01), None
patent: WO-01/21681 (2001-03-01), None

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