Process for the production of thermoplastic polycarbonates

Details Process for the production of thermoplastic polycarbonates Process for the production of thermoplastic polycarbonates

1993-11-19

1994-12-13

Kight, II, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528199, C08G 6400

Patent

active

053730828

ABSTRACT:
A process for the production of polycarbonates by melt transesterification is disclosed. Accordingly, polycarbonate waste is dissolved in monophenols and at an elevated temperature and in the presence of a catalyst degraded to yield oligocarbonates, diaryl carbonates and diphenols. Following the optional separation of fillers and other additives there is produced by partial recondensation and the distillation of monophenol a higher viscosity oligocarbonate having a OH and aryl carbonate terminal groups and a weight average molecular weight of 8000 to 18000, the oligocarbonate thus produced is then polycondensed to form a polycarbonate resin.

REFERENCES:
patent: 4346211 (1982-08-01), Krishnan et al.
patent: 4727134 (1988-02-01), Brunelle et al.
patent: 5151452 (1992-09-01), Fennhoff et al.
patent: 5189139 (1993-02-01), Tuinstra et al.
patent: 5266716 (1993-11-01), Buysch et al.

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