The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 2013
Filed:
Jun. 06, 2011
John Iatrou, Red Deer, CA;
Mark Jay Ziebart, Red Deer, CA;
Dale Warren Nagel, Lacombe, CA;
Kent Gray Jensen, Red Deer, CA;
Benjamin Milton Shaw, Calgary, CA;
John Iatrou, Red Deer, CA;
Mark Jay Ziebart, Red Deer, CA;
Dale Warren Nagel, Lacombe, CA;
Kent Gray Jensen, Red Deer, CA;
Benjamin Milton Shaw, Calgary, CA;
NOVA Chemicals (International) S.A, Fribeurg, CH;
Abstract
The time between shut downs of a gas phase reactor for the polymerization of polyethylene may be significantly increased if the catalyst used is not prepared by impregnating the support with a solution of catalyst in an electron donor; the reaction is controlled using the addition of activator based on polymer production rate and the recycle stream contains a condensed liquid phase in an amount greater than 13 weight %. Operating the reactor in this manner increase the time between cleaning the cooler (heat exchanger) the bed plate, or both from about 4 to 6 months to not less than about 24 months.