| http://www.w3.org/ns/prov#value | - Broadly speaking, in a process in which an olefin corresponding to the formula RCH=CH wherein R is an alkyl radical containing from 1 to 4 carbon atoms, is polymerized in the presence of a catalyst prepared by admixing at least two essential components, one of said components being a metal compound selected from the group consisting of Group IV, V, VI and VIII metal compounds, and another of said
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