| abstract |
(57) [Problem] To obtain an olefin (co) polymer having a large molecular weight. Obtaining an olefin copolymer having a high comonomer content even when using a small amount of a comonomer. SOLUTION: When (co) polymerizing an olefin, an olefin polymerization catalyst containing a compound of the following formula (II) or (III) and a water-treated organic aluminum oxy compound is used. (Wherein M is a transition metal of Group IVB, R 1 is at least one aryl group, others are hydrogen, R 2 is hydrogen, an alkyl group, etc., R 3 and R 4 are hydrogen, an alkyl group, etc. 6 is hydrogen, an alkyl group, etc., R 7 is hydrogen, an alkyl group, etc., R 8 and R 9 are any one of an alkyl group, and X 1 and X 2 are halogen, etc.) |