Method for preparing brominated polycarbonates, and products obt

Details Method for preparing brominated polycarbonates, and products obt Method for preparing brominated polycarbonates, and products obt

1997-09-02

1999-11-02

Dawson, Robert

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525132, 525383, 525439, 525447, C08C 1922

Patent

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.

Affiliated with

Also associated with

Rating

Method for preparing brominated polycarbonates, and products obt does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for preparing brominated polycarbonates, and products obt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing brominated polycarbonates, and products obt will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2136671