| http://www.w3.org/ns/prov#value | - Catalysts which are much more highly active in the polymerization of ethylene to polyethylene and in which the titanium compound is supported on a magnesium dihalide, especially MgCl2, in an activated state characterized by a very large surface area and/or by a modified X-rays powder spectrum which does not show the most intense diffraction lines as they appear in the spectrum of the normal, non-a
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