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:
Feb. 24, 1981
Filed:
Aug. 15, 1979
Paul L Eve, Polmont, GB;
BP Chemicals Limited, London, GB;
Abstract
Process for polymerizing ethylene, or mixtures thereof with up to 40 wt % of other 1-olefinic monomer comprising contacting the monomer under particle form polymerization conditions at a temperature not greater than 112.degree. C. with a catalyst prepared by heat activating chromium oxide or a compound calcinable thereto, on a refractory oxide support material and a catalyst modifier comprising an aliphatic diene and a trihydrocarbyl boron. The refractory oxide support material can be, for example silica and the heat activation is preferably carried at 400.degree. to 900.degree. C. The aliphatic diene preferably contains 1 to 10 carbon atoms and can be, for example butadiene, isoprene, 1,5-hexadiene, 1,7-octadiene or ethylidene norbornene. The trihydrocarbyl boron, for example trimethyl, triethyl or triisobutyl boron. The quantity of diene is preferably 10 to 5000 moles per gram atom of chromium and the quantity or trihydrocarbyl boron is preferably 0.1 to 20 moles per gram atom of chromium.