High melt strength, propylene polymer, process for making...

Details High melt strength, propylene polymer, process for making... High melt strength, propylene polymer, process for making...

C - Chemistry, Metallurgy

08

L

400/6503, 400/65

C08L 23/10 (2006.01) C08F 8/48 (2006.01) C08J 3/28 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2128064

Disclosed is a normally solid, high molecular weight, non-linear, substantially gel-free, propylene polymer material characterized by high melt strength due to strain hardening which is believed to be caused by free-end long chain branches of the molecular chains forming the polymer. Also disclosed is a process for making the polymer by high energy radiation of a normally solid, high molecular weight, linear, propylene polymer in a reduced active oxygen environment, maintaining the irradiated material in such environment for a specific period of time, and then deactivating free radicals in the material. Further disclosed is the use of the strain hardening polymer in extensional flow operations such as, for example, extrusion coating, film production, foaming and thermoforming.

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