Preparation of mixtures of brominated polystyrenes and brominate

Details Preparation of mixtures of brominated polystyrenes and brominate Preparation of mixtures of brominated polystyrenes and brominate

1981-01-26

1982-11-23

Welsh, Maurice J.

Compositions

Fire retarding

For solid synthetic polymer and reactants thereof

525356, 525357, C08L 2724

Patent

active

043604552

ABSTRACT:
A mixture of brominated oligomeric polystyrenes, having a degree of polymerization of from 3 to 400, and low molecular weight brominated aromatic compounds of the diphenyl ether type is obtained by polymerizing the non-brominated starting materials, in a halohydrocarbon solvent, using a Lewis acid catalyst. The reaction mixture is then brominated and extracted with water to remove hydrogen bromide and catalyst, and the solvent and volatile constituents are separated from the product. The bromination is carried out at from -30.degree. C. to +130.degree. C. The final mixtures have a low melt viscosity and are therefore particularly suitable for incorporation, as a flameproofing agent, into thermoplastics.

REFERENCES:
patent: 2676946 (1954-04-01), McCurdy et al.
patent: 4074032 (1978-02-01), Naarmann et al.
patent: 4143221 (1979-03-01), Naarmann et al.
patent: 4144288 (1979-03-01), Miano
patent: 4200703 (1980-04-01), Diebel et al.

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