Elimination of monocarbonate from polycarbonate

Details Elimination of monocarbonate from polycarbonate Elimination of monocarbonate from polycarbonate

1988-11-16

1990-07-03

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528199, 528370, 528371, C08G 6362

Patent

active

049392301

ABSTRACT:
A polycarbonate composition, and process for making same, wherein the monocarbonate and dicarbonate content is eliminated or limited to negligibly low levels by withholding introduction of chain terminator to the reaction mixture until the reaction of dihydroxy and carbonic acid derivative starting materials has run substantially to completion.

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patent: 4471104 (1984-09-01), Krishnan et al.
patent: 4503213 (1985-03-01), Krishnan et al.
patent: 4737573 (1988-04-01), Silva et al.
patent: 4864011 (1989-09-01), Bussink et al.

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