Thermal treatment of irradiated polypropylene

Details Thermal treatment of irradiated polypropylene Thermal treatment of irradiated polypropylene

C - Chemistry, Metallurgy

08

F

402/601, 204/91.

C08F 6/02 (2006.01) C08F 8/50 (2006.01) C08F 10/06 (2006.01)

Patent

CA 1325864

THERMAL TREATMENT OF IRRADIATED POLYPROPYLENE Abstract of the Disclosure Disclosed is a method of treating a free-radical- containing, optionally room-temperature-aged, irradiated, normally solid high-molecular-weight, semi-crystalline propylene polymer material at about from 40°C to 110°C for at least about 10 minutes before being exposed to the higher temperatures that deactivate the residual free radicals therein. Treatment of the polymer at the inter- mediate temperature causes recombination, and better utilization, of free radicals with the production of more long-chain branching. A two-stage fluid bed process, with a first stage at the intermediate temperature for radical recombination and a second radical-deactivation stage at a higher temperature, is preferred.

603873

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