Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1993-10-26
1995-03-21
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
558282, C08G 6400
Patent
active
053996577
ABSTRACT:
The invention relates to a method of preparing a compound of formula 1 ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 correspond to H, a branched or non-branched, optionally substituted alkyl group, or an optionally substituted aryl group, suitable as a chain stopper in the preparation of an aromatic polycarbonate, by reaction of a compound of formula 2 ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 have the meanings described hereinbefore, with phosgene, comprising the continuous supply of the compound of formula 2 and phosgene to a solution of phosgene in a solvent, the temperature being kept at a value between 0.degree. and 15.degree. C. and the pH being kept at a value between 1 and 6.
REFERENCES:
patent: 4638077 (1987-01-01), Brunelle et al.
patent: 4816420 (1989-03-01), Brunelle et al.
patent: 4864011 (1989-09-01), Bussink et al.
Maas Christianus J. J.
Oyevaar Martin H.
van der Wekke Laurus
van Hout Henricus H. M.
General Electric Company
Kight III John
Mosley Terressa
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