Polymerization catalyst composition and method for manufacturing the catalyst composition

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a polymerization catalyst composition capable of manufacturing a polymer added a carbon black or the carbon black added the polymer without passing a long time mix process.SOLUTION : A polymerization catalyst composition is manufactured by using a first element containing rare earth element-containing compound, a second element containing a compound represented by the formula (X), and a third element containing a carbon black, and mix aging the second element and the carbon black and then adding the first element to react. YRRR...(X), where Y is a metal selected from group 1, group 2, group 12 and group 13 in the periodic table, Rand Rare hydrocarbon groups having 1 to 10 carbon atoms or hydrogen atoms, Ris a hydrocarbon atom having 1 to 10 carbon atoms, however Rand Rmay be same or each different, an a is 1 and b and c are 0 when Y is a metal selected from group 1 in the periodic table, a and b are 1 and c is 0 when Y is a metal selected from group 2 and group 12 in the periodic table and a, b and c are 1 when Y is a metal selected from group 13 in the periodic table.