| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalyst composition which forms a resin having both high-density characteristics and low-density characteritics in a single reactor. SOLUTION: This catalyst composition contains (A) a catalyst precursor which is based on supported or unsupported magnesium/titanium and contains an electron donor and (B) a lanthanide catalyst precursor represented by the formula: CpaLnRbLc (wherein Cp is an optionally substituted cyclopentadienyl ligand; Ln is a lanthanide metal; R is a hydride, alkyl, silyl, halide, or aryl group; L is an electron donor; a+b is the valence of the lanthanide metal; and C is the amount of the electron donor enough to stabilize the lanthanide metal).
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