Brominated polysytrene having improved thermal stability and col

Details Brominated polysytrene having improved thermal stability and col Brominated polysytrene having improved thermal stability and col

1996-06-14

1997-06-10

Lipman, Bernard

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

Synthetic resins

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

5253333, 5253334, 525357, 5253591, 5253593, C08F 822

Patent

active

056376502

ABSTRACT:
In a process for the suppression of backbone halogenation during the bromination of polystyrenes comprising the step of pretreating a solution of a polystyrene reactant comprising from about five to about 20 percent by weight of a polystyrene reactant, in a halogenated hydrocarbon solvent with at least about 0.1 percent by weight of an additive to suppress halogenation of the polystyrene backbone prior to brominating the polystyrene in the presence of a catalyst; adding a metal halide bromination catalyst to the solution, capable of effecting bromination of the ring without causing crosslinking of the polystyrene; adding to the solution from about 1 to about 3.4 moles of a brominating agent, per mole of polystyrene repeating units; reacting the polystyrene reactant with the brominating agent at a reaction temperature of from about -20.degree. C. to about 50.degree. C., and isolating the brominated polystyrene. A brominated polystyrene is also provided having a backbone halogen content of less than about 750 ppm and, a .DELTA.E color as low as about 5.

REFERENCES:
patent: 4143221 (1979-03-01), Naarmann et al.
patent: 4352909 (1982-10-01), Barda et al.
patent: 5369202 (1994-11-01), Atwell et al.
patent: 5532322 (1996-07-01), Kadono et al.

Affiliated with

Also associated with

Rating

Brominated polysytrene having improved thermal stability and col does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Brominated polysytrene having improved thermal stability and col, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brominated polysytrene having improved thermal stability and col will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-765126