| 摘要 |
A process for the production of a pulverulent mixture consisting of (A) from 60 to 99 parts by weight of a brittle copolymer consisting of acrylonitrile and styrene, alpha -methylstyrene, methyl methacrylate or mixtures thereof, and (B) from 1 to 40 parts by weight of a flexible rubber-elastic polymer, by coagulating, in a first stage, a latex of (A) or a mixture of a latex of (A) and a part of a latex of (B), adding, in a second stage, the latex of (B) or the remaining part of the latex of (B), so that the desired quantity ratio of (A) to (B) is attained, and, in a third stage, separating the precipitated mixture of (A) and (B) from the aqueous phase, and drying it.
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