C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3034
C08L 31/04 (2006.01) C08J 3/00 (2006.01) C08L 25/12 (2006.01) C08L 33/12 (2006.01) C08L 21/02 (2006.01) C08L 51/04 (2006.01)
Patent
CA 1225773
23189-5708 ABSTRACT OF THE DISCLOSURE The invention relates to a process for the production of polymer mixtures in powder form consisting of A) from 95 to 20%, by weight, of at least one flexible rubber-elastic polymer having a glass transition temperature of ?35°C or a graft rubber, the rubber proportion of which amounts to from 50 to 95%, by weight, and which has a glass transition temperature of <20°C and is at least partially cross-linked, and B) from 5 to 80%, by weight, of a rigid thermoplastic polymer of styrene, .alpha.-methylstyrene, acrylo- nitrile, methyl methacrylate and mixtures thereof or of a graft rubber, the rubber proportion of which amounts to less than 50%, by weight, and which has a glass transition temperature of <20°C, characterised in that in a first stage, a latex of A) or a mixture of a latex of A) and some of the requisite latex of B) is coagulated at a temperature of from 20 to 100°C by the addition of a coagula- ting agent, in a second stage, the latex of B) or the remaining part of the latex of B) is added, so that the desired quantity ratio of A) and B) is attained, and further coagulating agent or water is optionally added simultaneously or thereafter until a solids/water weight ratio of from 1:3 to 1:15 is attained, and in a third stage, the precipitated mixture of A) and B) is separated from the aqueous phase and dried, the proportion of graft polymer in the mixture which is obtained being at least 10%, by weight. The powders which are produced according to the present invention are particularly suitable for the modification of conventional ABS-, MBS-, ASA, and vinyl chloride polymers (PVC), because they may be distributed and dispersed particularly easily in the melts of these polymers. Le A 22 249
451319
Hinz Jurgen
Lindner Christian
Trabert Ludwig
Uerdingen Walter
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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