Thermoplastic compositions in powder form

Details Thermoplastic compositions in powder form Thermoplastic compositions in powder form

C - Chemistry, Metallurgy

08

J

400/3045, 400/64

C08J 3/16 (2006.01) C08J 3/00 (2006.01) C08L 25/12 (2006.01) C08L 33/12 (2006.01) C08L 21/00 (2006.01)

Patent

CA 1225776

23189-5710 ABSTRACT OF THE DISCLOSURE A process for the production of a pulverulent mixture consisting of A) from 50 to 99 parts by weight of a brittle copo- lymer 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 precipated mixture of A) and B) from the aqueous phase, and drying it. The powders which are produced according to the present invention are distinguished by improved properties, in particular by a reduced tendency to form dust and by an improved pourability. They are generally used as modifiers for other plastics materials, for example for polyvinylchloride, and are distinguished by a particularly favourable behaviour during mixing. Le A 22 248

451321

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