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Preparation of mixtures of brominated polystyrenes and brominated aromatic compounds
Preparation of mixtures of brominated polystyrenes and brominated aromatic compounds
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机译：制备溴化聚苯乙烯和溴化芳族化合物的混合物
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摘要
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° C. to + 130° C. The final mixtures have a low melt viscosity and are therefore particularly suitable for incorporation, as a flameproofing agent, into thermoplastics.
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