Patent ID: 6525150
Filing Date: 2003-02-25
Classification: C08F

Abstract:
A method for producing an olefin polymer, comprising:polymerizing an olefin using a polymerization catalyst which comprises a compound (a), an organic aluminum compound (b), and an ionic compound (c); wherein said olefin is an ethylene/&agr;-olefin mixture that contains ethylene and an &agr;-olefin other than ethylene; wherein compound (a) is represented by formula (1) â€ƒwherein each of A1 and A2 has an atom which is bonded to M; wherein A1 and A2 are selected from the group consisting of a substituted nitrogen atom, an oxygen atom, a substituted silicon atom, a substituted phosphorus atom, a sulfur atom and a substituted sulfur atom; wherein A1 and A2 may be the same or different; wherein each of R1 and R2 is a hydrocarbon group with 1 to 20 carbons or a hydrocarbon group with 1 to 20 carbons and containing a heteroatom; wherein R1 and R2 may be bonded together and may be the same or different; wherein B has an atom which is bonded with said R1 and R2; wherein B is selected from the group consisting of a substituted nitrogen atom, an oxygen atom, a substituted phosphorus atom, a sulfur atom, a substituted sulfur atom, a substituted silicon atom, and a carbon which is part of a carbonyl group; wherein M is a metal atom of group 5 of the periodic table; wherein X has an atom which is bonded with M; wherein said atom of X is selected from the group consisting of a halogen atom, a carbon atom, a substituted nitrogen atom, an oxygen atom, a substituted silicon atom, a substituted phosphorus atom, a sulfur atom and a substituted sulfur atom; wherein said organic aluminum compound (b) is at least one compound selected from the group consisting of organic aluminum compounds represented by formula (2): (R3)nAlZ3âˆ’nâ€ƒâ€ƒ(2) wherein R3 is a hydrocarbon group with 1 to 20 carbon atoms; wherein Z is a hydrogen atom, a hydrogen atom, or an alkoxyl group; and wherein n has a value of 1 to 3.