High melt strength, ethylene polymer, process for making it, and

Details High melt strength, ethylene polymer, process for making it, and High melt strength, ethylene polymer, process for making it, and

1995-04-13

1996-09-03

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Direct application of fluid pressure

264470, 264485, 264488, 264564, 522157, 522161, B29C 3508

Patent

active

055521045

ABSTRACT:
A normally solid, high molecular weight, gel-free, irradiated ethylene polymer is characterized by high melt strength due to strain hardening elongational viscosity, which is believed to be caused by free-end long chain branching of the molecular chains forming the polymer. The polymer is prepared by (1) irradiating a normally solid, high molecular weight ethylene polymer without strain hardening elongational viscosity while in the solid state in an environment in which the active oxygen concentration is less than 15% by volume, maintaining the irradiated material in this environment while in the solid state for a specific period of time, and then deactivating free radicals present in the material.

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