Flame retardant polycarbonate polyblends

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

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260 457R, 260 457L, 260 4585R, 260 4585T, 260 4595G, 525150, 525132, 260873, 528198, 528204, 528426, 528491, 528492, 528493, C08L 6700

Patent

active

041743598

ABSTRACT:
The present invention pertains to a halogen-containing, copolycarbonate blend having improved critical thickness and flammability properties comprising an aromatic copolycarbonate comprising the reaction product of an aromatic diphenol, an aromatic thiodiphenol and a carbonic acid derivative, such as phosgene or carbonyl bromide, blended with an effective amount of a halogen-containing compound. In a preferred embodiment, the copolycarbonate blend also contains small amounts of a perfluoro sulfonic or carboxylic acid salt.

REFERENCES:
patent: 3250744 (1966-05-01), Schnell et al.
patent: 3398212 (1968-08-01), Jackson, Jr. et al.
patent: 3912687 (1975-10-01), Haupt et al.
patent: 3978024 (1976-08-01), Mark

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