Novel catalysts for the production of polyolefins

Details Novel catalysts for the production of polyolefins Novel catalysts for the production of polyolefins

C - Chemistry, Metallurgy

07

F

C07F 17/00 (2006.01) C08F 4/58 (2006.01) C08F 4/642 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01) C08F 110/02 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2173007

A catalyst precursor is provided wahich is useful, when combined with a cocatalyst, in the manufacture of polyolefins. The catalyst precursor is of the formula: Image or Image where M is a transition metal, preferably Zr or Hf; L is a substituted or substituted, .pi. bonded ligand coordinated to M, preferably a cyclopentadienyl-type ligand; X can be the same or different and is independently selected from the group consisting of -O, -NR, -CR2 and -S; Y is either C or S; Z is selected from the group consisting of -OR, -NR2, -CR3, -SR, -SiR3, -PR2 or H; n is 1 or 2; W is a univalent anionic group when n is 2 or W is a divalent anionic group when n is 1; R can be the same or different and is independently a group containing carbon, silicon, nitrogen, oxygen, and/or phosphorus where one or more R groups may be attached to the L substituent, preferably R is a hydrocarbon group containing from 1 to 20 carbon atoms, most preferably an alkyl, cycloalkyl or an aryl group and one or more may be attached to the L substituent; B is a bridging group selected from the group consisting of an alkylene or arylene group containing from 1 to 10 carbon atoms, germanion, silicone and alkyl phosphine; and m is 1 to 7, preferably 2 to 6, most preferably 2 or 3.

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