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

1993-07-15

1995-05-09

Seccuro, Jr., Carman J.

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

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

525322, 525323, 525240, 525 88, 525 95, 522109, 522157, 522158, 522161, C08J 328, C08L 2310, C08L 2316, C08L 5300, C08L 2326

Patent

active

054140277

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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L. Spenadel, "Radiation Crosslinking of Polymer Blends", Radiat. Phys. Chem. vol. 14, pp. 683-697, 1979, discloses radiation crosslinking of ethylene-propylene/polyolefin blends.
G. G. A. Bohm et al., "The Radiation Chemistry of Elastomers and Its Industrial Applications", Rubber Chemistry and technology, vol. 55, pp. 575-668.
D. E. Harmer et al. "Applying Radiation to Chemical Processing", Chemical Engineering, pp. 91-98, May/1971.
H. H. O'Donnell et al., "The Radiation Crosslinking and Scission of Ethylene-Propylene Copolymer Studied by Solid-state Nuclear Magnetic Resonance" British Polymer Journal vol. 17, No. 1, pp. 51-55, 1985.

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