Catalytic process for preparing polycarbonates from carbonic aci

Details Catalytic process for preparing polycarbonates from carbonic aci Catalytic process for preparing polycarbonates from carbonic aci

1989-07-10

1991-06-25

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, 528198, 528200, C08G 6430

Patent

active

050268171

ABSTRACT:
A process for preparing polycarbonates according to the invention by melt polycondensation of aromatic dihydroxy compounds and carbonic acid diesters, is characterized by using an aromatic dihydroxy compound and a carbonic acid diester, wherein the combined content of hydrolyzable chlorine in those monomers falls within the particular range. Another process for preparing polycarbonates according to the invention by melt polycondensation of aromatic dihydroxy compounds and carbonic acid diesters, is characterized by using a catalyst comprising (a) a nitrogen containing basic compound and (b) aromatic hihydroxy compound of an alkali metal or alkaline earth metal compound, or (a) and (b) and (c) boric acid or boric ester.

REFERENCES:
patent: 4839458 (1989-06-01), Koga et al.
patent: 4880896 (1989-11-01), Otsubo et al.

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