Method for preparing brominated polycarbonates, and products obt

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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525132, 525383, 525439, 525447, C08C 1922

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active

059772654

ABSTRACT:
High flow brominated polycarbonates, useful as flame retardant additives for other polymers such as polyesters, are obtained by equilibration of a brominated aromatic polycarbonate such as a tetrabromobisphenol A homo- or copolycarbonate with a di- or polyhydroxy aromatic compound such as bisphenol A, or a diaryl carbonate, and an equilibration catalyst, under conditions such that the weight average molecular weight of the brominated polycarbonate is reduced by at least 35%. Preferred equilibration catalysts are Group I metal carboxylates, such as sodium stearate, and hexaalkylguanidinium salts.

REFERENCES:
patent: 3915926 (1975-10-01), Wambach
patent: 3936400 (1976-02-01), Wambach
patent: 4101519 (1978-07-01), Hallgren
patent: 5021521 (1991-06-01), Krabbenhoft et al.
patent: 5414057 (1995-05-01), Campbell et al.

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