Foamed articles comprising high melt strength propylene polymer

Details Foamed articles comprising high melt strength propylene polymer Foamed articles comprising high melt strength propylene polymer

1996-03-28

1997-02-25

Berman, Susan W.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 98, 521134, 521140, 522157, 522158, 522161, 522911, C08G 8100, C08J 328, C08J 900, C08L 2312

Patent

active

056059361

ABSTRACT:
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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