| http://www.w3.org/ns/prov#value | - Preferable titanium compounds which can be used for the solid catalyst component are the compounds represented by the formula Ti(OR)nX4-n wherein R is a hydrocarbon group, X is halogen and 0???n???4, for example, tetrahalogenated titanium such as TiCl4 and TiBr4; trihalogenated alkoxy titanium such as Ti(OCH3)Cl3 and Ti(OC2H5)Cl3; dihalogenated dialkoxy titanium such as Ti(OCH3)2Cl2 and Ti(OC2H5)2
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