| 摘要 |
PURPOSE: To obtain a crystalline polypropylene having improved rigidity and heat resistance and high hardness, and being excellent in fatigue resistance, abrasion resistance, dimensional stability, chemical resistance, moldability, etc., by forming a polymer having specified properties by using a specified catalyst. CONSTITUTION: A crystalline polypropylene obtained by using anα-olefin polymerization catalyst component prepared by bringing a solid component essentially consisting of a metal oxide, Mg, Ti, a halogen and an electron-donating compound into contact with an olefin in the presence of an organoaluminum compound and an organosilicon compound represented by the formula: R<1> Si(OR<2> )x (OR<3> )y (wherein R<1> is a 5-7 C alicyclic hydrocarbon group; R<2> is 2-ethoxyethyl or 2-methyl-3-butin-2-yl; R<3> is methyl or ethyl; (x) is 1-2; (y) is 1-2; and x+y=3), having a melt flow rate(MFR) of 0.01-1000 as measured according to ASTM D-1238 and satisfying the relationship: Tp>=119.49-0.2591logMFR (wherein Tp is the elution peak temperature as determined by the climbing temperature fractionation.
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