Exxonmobil Chemical Patents Inc.

Wesley J Robertson

Joel Edward Schmieg

Jerry Michael Johnson

Joanne K Pabst

W Bing Kao

Timothy J Cowell

James E Wagner

Tomasz J Gralinski

Thomas R Rios

Dale J Joy

Carl Dean Heard

Processes are disclosed for oxygen-tailoring polyethylene resin. Polyethylene resin is conveyed through a feed zone, a melt-mixing zone and a melt zone. The resin is contacted with oxygen in an amount of at least 40 parts by weight Oper million parts by weight resin, and contacted with primary antioxidant downstream of the point or points of oxygen contact. The oxygen-treated resin can be used to make polyethylene film having improved gauge uniformity.

Oxygen tailoring of polyethylene film resins

Process for pelletizing polyethylene resin are disclosed, the processes providing pelletized resin having reduced occurrence of defects such as black specks. Polyethylene resin is conveyed in a downstream direction through a mixer having a feed zone, a melt-mixing zone downstream of the feed zone, and a melt-conveying zone downstream of the melt-mixing zone; contacted with nitrogen gas in the melt-conveying zone; and conveyed through a mixer discharge to form pellets. Also disclosed are processes of forming films from such resins, the films having reduced occurrence of gels, and articles such as blow molded or injection molded articles.

Method of processing polyethylene resins

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Humble, TX, United States of America

Wesley J Robertson