| 摘要 |
The invention relates to a process for the preparation of a copolymer of a vinyl aromatic compound and an unsaturated nitrile, optionally in the presence of a rubber, by polymerizing in an emulsion of the vinyl aromatic compound, the unsaturated nitrile, the rubber, one or more emulsifiers, one or more chain length regulators and one or more peroxides and processing the latex thus formed to copolymer. This process is characterized in that an emulsion of the vinyl aromatic monomer, chain length regulator and emulsifier is prepared in water, upon which the unsaturated nitrile and initiator are added, separately or jointly, and the polymerization is started.
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