Method for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxy

Details Method for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxy Method for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxy

1978-06-27

1980-09-09

Pertilla, Theodore E.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528205, 528219, 568726, C08G 6362

Patent

active

042219019

ABSTRACT:
A method is described for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane employing a refluxing dipolar aprotic solvent, such as dimethylformamide, containing a lithium halide catalyst to produce a crystalline product consisting essentially of 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene. The crystalline product can be isolated in substantially pure form and converted to a high impact, flame retardant polycarbonate.

REFERENCES:
patent: 3989672 (1976-11-01), Vestergaard
patent: 4124652 (1978-11-01), Quinn
McCelland et al., JCS Perkin II, pp. 1818-1822, 308 (1972).
Holysz, JCS, 75, pp. 4432-4437 (1953).
Porejko et al., Polimery 13, (2), 55 (1968).
Sobicaewski et al., "On the Stability of Polycarbonates," from, Chlorobisphenols, Inst. for Plastics, Warsaw, 10/26/1967.
Dubkowski et al., "Synthesis of Polycarbonates by Interfacial Method," (1970).
Wielgosz et al., Polimery-Tuorzywa Wielkoczasteczkowe (1971), pp. 495-500.

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