| 摘要 |
PROBLEM TO BE SOLVED: To produce a crystalline polypropylene excellent in rigidity and heat resistance by bringing a solid component such as a metallic oxide into contact with an olefin in the presence of an organoaluminum compound and a specific organosilicon compound and polymerizing propylene with the resultant catalyst for polymerizing anα-olefin. SOLUTION: This crystalline polypropylene is obtained by bringing (A) a solid component consisting essentially of a metallic oxide, Mg, Ti, a halogen and an electron donative compound is brought into contact with (D) an olefin in the presence of (B) an organoaluminum compound and (C) an organosilicon compound of the formula R<1> Si(OR<2> )x (OR<3> )y R<1> is a 5-7C alicyclic hydrocarbon; R<2> is 2-ethoxyethyl or 2-methyl-3-butyn-2-yl; R<3> is methyl or ethyl; (x) and (y) are each 1 or 2; [(x)+(y)] is 3}, providing a catalyst component for polymerizing anα-olefin and polymerizing propylene by using the resultant catalyst component. The produced crystalline polypropylene has 0.01-1000 melt flow rate(MFR) measured according to ASTM D-1238 and heat of melting (ΔHm) obtained from the differential scanning calorimetry and the MFR satisfy the relationship of the formula.
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