Ethylenic polymerization catalyst

Claim 1

An ethylenic polymerization catalyst comprising (A) a chromium compound selected from the group consisting of compounds of formulae (1) to (6): ##STR7## wherein in formulas (1) and (2) R 1 , R 2 , R 3 , R 4 and R 5 may be the same or different and each represents a hydrogen atom or a C 1-18 hydrocarbon group; CrY.sub.e.Z.sub.f 'Z.sub.g ( 3) wherein in formula (3) Y represents a 1,3-diketo chelate ligand; Z 1 and Z 2 may be the same or different; each is selected from the group consisting of a halogen atom, and e represents a number of from 1 to 3, with the proviso that e, f and g satisfy the relationship: ##STR8## wherein in formula (4) R 6 , R 7 , R 8 , R 9 , R 10 and R 11 may be the same or different and each represents a C 1-18 hydrocarbon group; and M 1 and M 2 each represents a carbon atom or a silicon atom; ##STR9## wherein in formulas (5) and (6) R 12 and R 41 may be the same or different and each represents a hydrogen atom or a C 1-18 hydrocarbon group; M 3 to M 12 each represent a carbon atom or a silicon atom; L 1 represents a ligand and h represents a number of from 0 to 2, (B) a carrier, (C) aluminoxane, and (D) a transition metal compound comprising a group with a conjugated π electron as a ligand and selected from the group consisting of compounds of formulae (14) to (20): (Cp.sup.2) (Cp.sup.3).sub.u Me(Q.sup.1).sub.3-u ( 14) R.sup.51 (Cp.sup.2) (Cp.sup.3)Me(Q.sup.1) (Q.sup.2) (15) R.sup.51 (Cp.sup.2) (Y)Me(Q.sup.1) (Q.sup.2) (16) ##STR10## wherein Cp.sup.2 and Cp.sup.3 may be the same or different and each represents a ligand having a cyclopentadienyl skeleton; R.sup.48 to R.sup.50 may be the same or different and each represents a hydrogen atom, a C.sub.1-20 hydrocarbon group, an alkylsilyl group or an alkylgermyl group; R.sup.51 represents a C.sub.1-20 alkylene group, an alkylgermylene group or an alkylsilylene group; X.sup.1 and X.sup.2 may be the same or different and each represents a carbon atom or a nitrogen atom; Q.sup.1 and Q.sup.2 may be the same or different and each represents a hydrogen atom, a C.sub.1-20 hydrocarbon group, an alkoxy group, an aryloxy group, a siloxy group or a halogen atom; Y represents an electron donor ligand represented by --O--, --S--, --NR.sup.52 -- or --PR.sup.52 --, in which R.sup.52 represents a hydrogen atom, a C.sub.1-20 hydrocarbon group, a halogenated alkyl group or a halogenated aryl group; Me represents a transition metal; and u represents an integer of 0 or 1; R 51 represents a C 1-20 alkylene group, an alkylgermylene group or an alkylsilylene group; X 1 and X 2 may be the same or different and each represents a carbon atom or nitrogen atome, Q 1 and Q 2 may be the same or different and each represents a C 1-20 hydrocarbon group, a siloxy group or a halogen atom; and Y represents an electron donor ligand represented by --O--, --S--, NR 52 -- or --PR 52 --; R 52 represents a C 1-20 hydrocarbon group, a halogenated alkyl group or a halogenated aryl group; wherein said chromium compound (A) is not calcined.