| http://www.w3.org/ns/prov#value | - 20 carbon atoms, X is a halogen or a hydrocarbyloxy group having from 1 to about 20 carbon atoms, m has a value from zero to 2; said activating agent being present in a quantity sufficient to provide an Al, Mg and/or Zn:Tm atomic ratio of from about 1:1 to about 5000:1.
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