Magnesium compound, olefin polymerization catalyst, and method for producing olefin polymer

An olefin polymerization catalyst comprising (A) a solid catalyst component prepared by contacting (a) a magnesium compound whose particle size distribution index (P), as defined in formula (I-1), is smaller than 4.0, P<4.0:

• P=(D90/D10) (I-1)
• wherein D90 indicates the particle diameter of the compound particles corresponding to the cumulative weight fraction of 90% in the particle size distribution thereof computed from light transmittance through a suspension of the compound particles in a hydrocarbon;
• and D10 indicates the particle diameter of the compound particles corresponding to the cumulative weight fraction of 10% therein, and prepared by reacting metallic magnesium, an alcohol and 0.0005 to less than 0.06 gram atoms, in terms of halogen atoms relative to one gram atom of magnesium, of a halogen and/or a halogen-containing metal compound, in the presence of a saturated hydrocarbon compound with (b) a titanium compound of the following general formula (II-3), and (B) an organometallic compound:
• Ti(OR)nX4-n (II-3)
• wherein X indicates a halogen atom;
• R indicates a hydrocarbon group having from 1 to 10 carbon atoms, and R's may be the same or different;
• and n indicates an integer of from 0 to 4.

An olefin polymerization catalyst comprising (A) a solid catalyst component prepared by contacting (a) a magnesium compound whose particle size distribution index (P), as defined in formula (I-1), is smaller than 4.0, P<4.0:

• P=(D90/D10) (I-1)
• wherein D90 indicates the particle diameter of the compound particles corresponding to the cumulative weight fraction of 90% in the particle size distribution thereof computed from light transmittance through a suspension of the compound particles in a hydrocarbon;
• and D10 indicates the particle diameter of the compound particles corresponding to the cumulative weight fraction of 10% therein, and prepared by reacting metallic magnesium, an alcohol and 0.0005 to less than 0.06 gram atoms, in terms of halogen atoms relative to one gram atom of magnesium, of a halogen and/or a halogen-containing metal compound, in the presence of a saturated hydrocarbon compound, (b) a titanium compound of the following general formula (II-3) and (c) an electron donor compound with each other, (B) an organometallic compound, and (C) a third component of an electron donor compound:
• Ti(OR)nX4-n (II-3)
• (wherein X indicates a halogen atom;
• R indicates a hydrocarbon group having from 1 to 10 carbon atoms, and R's may be the same or different;
• and n indicates an integer of from 0 to 4).

A solid catalyst component prepared by contacting (a) a magnesium compound whose particle size distribution index (P), as defined in formula (I-1), is smaller than 4.0, P<4.0:

• P=(D90/D10) (I-1)
• wherein D90 indicates the particle diameter of the compound particles corresponding to the cumulative weight fraction of 90% in the particle size distribution thereof computed from light transmittance through a suspension of the compound particles in a hydrocarbon;
• and D10 indicates the particle diameter of the compound particles corresponding to the cumulative weight fraction of 10% therein, and obtained by reacting metallic magnesium, an alcohol and 0.0001 to less than 0.06 gram atom, in terms of halogen atoms relative to one gram atom of magnesium, of a halogen and/or a halogen-containing metal compound, at 30 to 60° C. with (b) a titanium compound of formula (I-3):
• Ti(OR)nX4-n (I-3)
• wherein X indicates a halogen atom;
• R indicates a hydrocarbon group having from 1 to 10 carbon atoms, and R's may be the same or different;
• and n indicates an integer of from 0 to 4.