High melt strength, propylene polymer, process for making it, an

Details High melt strength, propylene polymer, process for making it, an High melt strength, propylene polymer, process for making it, an

1993-11-04

1998-03-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 79, 521143, 521144, 521134, C08J 900

Patent

active

057313628

ABSTRACT:
Disclosed is a normally solid, high molecular weight, gel-free, amorphous to predominantly crystalline, propylene polymer 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, and thermoforming.

REFERENCES:
patent: 5116881 (1992-05-01), Park et al.

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