Thermomechanical degradation of polyolefins
AssigneeBASF SE
InventorsAndreas Deckers, Albin Berger, J urgen Hofmann, Roger Klimesch, Karl-Peter Farwerck, Hilmar Ohlig
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Abstract
Polyolefins are thermomechanically degraded in a twin-screw extruder without a downstream degradation apparatus, at from 300.degree. to 550.degree. C. and from 1 to 100 bar and in average residence times of the reaction mixture of from 0.5 to 10 minutes, by a process in which the pressure in the twin-screw extruder is changed periodically or aperiodically with a fluctuation of from 0.5 to 30 bar. The novel process is particularly suitable for the degradation of polypropylene.
Claims10
A process for the thermomechanical degradation of polyolefins consists essentially of a twin-screw extruder without a downstream degradation apparatus, at from 300.degree. to 550.degree. C. and from 1 to 100 bar and in average residence times of the reaction mixture of from 0.5 to 10 minutes, wherein the pressure in the twin-screw extruder is changed periodically with a fluctuation of from 0.5 to 30 bar.
Dependencies are inferred from the claim text.