Process for modifying a polyethylene in an extruder

Details Process for modifying a polyethylene in an extruder Process for modifying a polyethylene in an extruder

C - Chemistry, Metallurgy

08

F

C08F 8/06 (2006.01) B29B 13/02 (2006.01) B29C 47/38 (2006.01) B29C 67/24 (2006.01) C08F 2/34 (2006.01) C08F 8/50 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2156894

The present invention relates to a process for modifying a polyethylene in an extruder. The polyethylene is brought into contact with oxygen or a gas mixture containing oxygen in the extruder, optionally in the presence of a relatively small quantity or preferably in the absence of short-term antioxidant agent. The polyethylene thus brought into contact is treated thermomechanically in the molten state in the extruder supplying a relatively high specific mechanical energy, the treatment being conducted to its term when the value of the loss tangent of the polyethylene characterizing its viscoelastic state decreases with a desired proportion. The polymer thus treated is particularly suitable for being transformed into film by blown extrusion with a considerably increased bubble stability.

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