Low individual color thermoplastic molding material

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 279/04 (2006.01) C08L 25/12 (2006.01) C08L 51/04 (2006.01) C08L 51/06 (2006.01) C08L 55/02 (2006.01) C08L 25/14 (2006.01)

Patent

CA 2294918

The invention relates to thermoplastic molding material containing the constituents A) to F), 5 to 80 wt. % of a graft polymer A) with a bimodal particle size distribution, 20 to 95 wt. % of a thermoplastic polymer B) with a viscosity VZ of 50 to 120 ml/g and optionally other thermoplastic polymers C), D) and/or E) based on at least one vinyl-aromatic monomer, and optionally additives F). The inventive material can be obtained by 1) producing the graft polymers A) according to the emulsion polymerization method, 2) mixing the graft polymer A) with polymer B) and, insofar as they are available, the other constituents C), D), E) and/or F) in a mixing device, whereby a substantially molten polymer mixture arises and 3) rapidly cooling the substantially molten polymer mixture.

L'invention concerne une matière moulable contenant les composants A) à F) suivants: A) 5 à 80 % en poids d'un polymère greffé A) ayant une répartition granulométrique bimodale, B) 20 à 95 % en poids d'un polymère thermoplastique B) ayant un indice de viscosité compris entre 50 et 120 ml/g et éventuellement d'autres polymères thermoplastiques C), D) et/ou E) à base au moins d'un monomère vinylaromatique, et éventuellement d'adjuvants F). Ces derniers peuvent être obtenus par 1) production d'un polymère greffé A) selon le procédé de polymérisation en émulsion, 2) mélange du polymère greffé A) avec le polymère B) et les éventuels autres composants C), D), E) et/ou F), dans le mélangeur, ce qui permet d'obtenir un mélange polymérique sensiblement en fusion, 3) rapide refroidissement du mélange polymérique sensiblement en fusion.

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