| http://www.w3.org/ns/prov#value | - The new catalyst components of the invention are prepared by reacting the solid halogenated Ti compound with the Grignard compound in an aliphatic hydrocarbon, such as n-hexane or n-heptane, at a temperature between 35??? and 40??? C., according to a molar ratio Grignard compound/Ti-compound of at least 7.
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