Brominated polystyrene having improved thermal stability and col

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

1997-02-07

1998-03-10

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...

5253334, 525356, 525357, 5253591, 5253593, C08F 822

Patent

active

057262527

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), Kedono et al.

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