Thermomechanical degradation of polyolefins

Details Thermomechanical degradation of polyolefins Thermomechanical degradation of polyolefins

1995-10-19

1997-05-20

Weber, Thomas R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528502C, 528502F, C08F 604

Patent

active

056313462

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.

REFERENCES:
patent: 3898209 (1975-08-01), Watson et al.
patent: 5292862 (1994-03-01), Miura et al.

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