Method of reducing gels in polyolefins

Details Method of reducing gels in polyolefins Method of reducing gels in polyolefins

2008-07-01

2008-07-01

Boykin, Terressa (Department: 1796)

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

Synthetic resins

Treating polymer containing material or treating a solid...

C264S211000, C525S240000, C525S242000

Reexamination Certificate

active

07393916

ABSTRACT:
A process of producing a polyolefin, in one embodiment a polyethylene, and in a preferred embodiment a bimodal polyethylene comprising a high molecular weight component and a low molecular weight component, the process comprising providing a polyolefin having an I21value of from 2 to 100 g/10 min and a density of from 0.91 to 0.97 g/cm3; followed by forming a melt of the polyolefin and passing the polyolefin through one or more active screen filter(s) having a mesh size of from 70 to 200 micron at a mass flux of from 5 to 100 lbs/hr/square inch; and isolating the polyolefin having passed through the screen filter.

REFERENCES:
patent: 3891499 (1975-06-01), Kato et al.
patent: 5730885 (1998-03-01), Blakeslee et al.
patent: 6274684 (2001-08-01), Loveday et al.
patent: 6485662 (2002-11-01), Neubauer et al.
patent: 6875828 (2005-04-01), Kuo et al.
patent: 2004/101674 (2004-11-01), None
Schonbauer, Gerhard;Filtration of Polymer Melts; (D. Gneuss, ed., VDI-Verlag GmbH, Düsseldorf 1981).

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