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

1995-08-16

1998-04-14

Weber, Thomas R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528487, 528490, 528502C, C08F 202

Patent

active

057392668

ABSTRACT:
The present invention relates to a process for modifying a polyethylene in an extruder by bringing the polyethylene 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 is then treated thermomechanically in the molten state in the extruder supplying a relatively high specific mechanical energy, the thermomechanical treatment is completed when the value of the loss tangent of the polyethylene characterizing its viscoelastic state decreases in a desired proportion. The polymer thus treated is particularly suitable for being transformed by blown extrusion into a film having a considerably increased bubble stability.

REFERENCES:
patent: 3551943 (1971-01-01), Staton
patent: 3563972 (1971-02-01), Kowalski
patent: 3608001 (1971-09-01), Kowalski et al.
patent: 3898209 (1975-08-01), Watson et al.
patent: 4029877 (1977-06-01), Yoshiura et al.
patent: 4820463 (1989-04-01), Raufast

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