Polypropylene with free-end long chain branching, process...

Details Polypropylene with free-end long chain branching, process... Polypropylene with free-end long chain branching, process...

C - Chemistry, Metallurgy

08

F

18/521, 402/624,

C08F 8/50 (2006.01) C08F 110/06 (2006.01) C08J 3/28 (2006.01)

Patent

CA 1280543

0077K 2001-2 POLYPROPYLENE WITH FREE-END LONG CHAIN BRANCHING, PROCESS FOR MAKING IT, AND USE THEREOF Abstract of Disclosures Disclosed is normally solid, gel-free, amorphous to predominantly crystalline, polypropylene characterized by strain hardening believed to be due to molecular chains that have substantial, free-end long branches of propylene units. Also disclosed is a process for making it by high energy radiation of linear polypropylene in a reduced active oxygen environment, maintaining the irradiated material in such environment for a specific period of time, and then deacti- vating free radicals in the material. Further disclosed is the use of the strain hardening polypropylene in extensional flow operations such as, for example, extrusion coating, film production, and thermoforming.

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