Process for pelletizing elastomeric anionically polymerised...

Details Process for pelletizing elastomeric anionically polymerised... Process for pelletizing elastomeric anionically polymerised...

B - Operations, Transporting

29

B

B29B 9/12 (2006.01) B29B 7/40 (2006.01) B29B 7/42 (2006.01) B29B 9/00 (2006.01) B29B 9/06 (2006.01) B29B 9/08 (2006.01) B29B 9/10 (2006.01) B29C 47/38 (2006.01)

Patent

CA 2332923

A process for pelletizing elastomeric anionically polymerized polymers which comprises subjecting the polymer to solid state extrusion in a single screw extruder with a length to diameter ratio of 10:1 or less wherein the barrel of the extruder has longitudinal grooves and transversally extending pins to increase mixing wherein the temperature in the extruder is sufficient to agglomerate or melt the polymer but lower than the degradation temperature of the polymer and the speed of the extruder screw is from 30 to 100 rpm.

La présente invention concerne un procédé de pelletisation de polymères élastomères anioniquement polymérisés, lequel procédé consiste à soumettre le polymère à une extrusion à l'état solide en utilisant une extrudeuse monovis. En l'occurrence, cette vis présente un rapport longueur diamètre de 10:1 au plus. Le fût de l'extrudeuse présente des rainures longitudinales ainsi que des aiguilles transversales venant augmenter le mélange. La température à l'intérieur de l'extrudeuse est suffisante pour provoquer l'agglomération ou la fusion du polymère, mais inférieure à la température de dégradation du polymère, la vitesse de la vis de l'extrudeuse étant comprise entre 30 et 100 tours par minute.

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