| http://www.w3.org/ns/prov#value | - U.S. Pat. No. 4,263,168 describes catalyst components for the polymerization of propylene and other alpha-olefins, obtained by reacting a metal oxide, such as silica or alumina, containing hydroxyls on the surface, with an organometallic magnesium compound of the formula MgR2-x Xx (where R is a hydrocarbon radical; X is halogen; x is a number from 0.5 to 1.5), and subsequent reaction with an elect
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