| http://www.w3.org/ns/prov#value | - least one aluminum compound selected from the group consisting of ethylaluminum sesquichloride, tris(hydrocarbyl)aluminum compounds, chlorinated and brominated hydrocarbylaluminum compounds, with general formula AlR???mY3-m, where R??? is a hydrocarbyl radical containing 1 to 6 carbon atoms, Y is a chlorine or bromine atom and m is a number from 1 to 3, and aluminoxanes. 2.
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