Process for the preparation of high molecular thermoplastic poly

Details Process for the preparation of high molecular thermoplastic poly Process for the preparation of high molecular thermoplastic poly

1975-12-11

1978-07-04

Pertilla, Theodore E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 18TN, 260823, 528197, 260DIG24, C08G 6362, C08L 6900

Patent

active

040987540

ABSTRACT:
The present invention is concerned with a process for the production of high molecular weight thermoplastic ppolycarbonates having improved flame resistance and in conjunction with glass fibres, improved mechanical properties and the polycarbonates so produced. A solution polycarbonate is reacted with an alkali metal salt soluble in the melt of the polycarbonate until the Staudinger Index has increased by about 3 to 30 cm.sup.3 /g. This usually requires about 0.0001 to 0.1 wt. % of the salt, based on the weight of polycarbonate and a temperature of about 250.degree. to 400.degree. C for between about 1 and 30 minutes. In a preferred embodiment the reaction is conducted in a self-cleaning twin screw extruder.

REFERENCES:
patent: 3275601 (1966-09-01), Schnell
patent: 3775367 (1973-11-01), Nouvertne et al.
patent: 3836490 (1974-09-01), Bockmann et al.
patent: 3845007 (1974-10-01), Nouvertne et al.
Chemistry & Physics of Polycarbonates, pp. 199-201, by Herman Schnell, 4/1965.

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