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:
Aug. 08, 1978
Filed:
Aug. 25, 1977
Glen R Hoff, Naperville, IL (US);
Peter Fotis, Jr, Highland, IN (US);
David E Boone, Lisle, IL (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
The particle size of as formed polyethylene or ethylene copolymer containing up to about fifteen percent of a C.sub.3 to C.sub.8 olefin, which is made using a promoted solid catalyst component prepared from a magnesium alkoxide, a titanium (IV) alkoxide and an alkylaluminum dichloride, is increased by adding the dichloride in at least two stages and allowing the preparation mixture to age between stages during the preparation of said catalyst component. The particle size of polymer can be increased substantially using the so treated catalyst component, compared to the particle size of polymer made using untreated catalyst component, when either catalyst component is employed together with an alkylaluminum compound promoter in a slurry or vapor phase process at moderate polymerization temperature and pressure.