Method for producing dyed moulding materials

B - Operations – Transporting – 29 – C

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B29C 47/10 (2006.01) C08J 3/20 (2006.01)

Patent

CA 2302487

The invention relates to a continuous method for producing dyed thermoplastic moulding materials in an extruder, as follows: I) in a first area, A) 10 to 99.999 wt. % of a thermoplastic polymer is metered into an extruder. II) In a subsequent area, B) 0.001 to 60 wt. % of a dye is added at a temperature below the particular glass transition temperature of the thermoplastic A). In the subsequent areas, the thermoplastic/dye mixture is heated, the polymer melt is homogenised and the resulting mixture is extruded.

L'invention concerne un procédé continu de production de matières de moulage thermoplastiques à l'état coloré dans une extrudeuse. Selon ce procédé, I) dans une première zone, A) entre 10 et 99,999 % en poids de polymère thermoplastique sont dosés dans une extrudeuse et II) dans une zone suivante, B) entre 0,001 et 60 % en poids de colorant sont ajoutés à des températures inférieures à chacune des températures de transition vitreuse du thermoplastique A) et pour finir, le mélange thermoplastique/colorant est chauffé dans les zones suivantes et la matière polymère fondue est homogénéisée et le mélange obtenu est extrudé.

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