Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1995-03-29
1996-06-18
Nagumo, Mark
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502123, 556 51, 556 52, 556 55, 556 11, 556 14, 556 31, 526160, C08F 4642
Patent
active
055277527
ABSTRACT:
A catalyst precursor is provided which is useful, when combined with a cocatalyst, in the manufacture of polyolefins. The catalyst precursor is of the formula: ##STR1## where M is a transition metal, preferably Zr or Hf; L is a substituted or unsubstituted, .pi. bonded ligand coordinated to M, preferably a cyclopentadienyl-type ligand; Q can be the same or different and is independently selected from the group consisting of --O, --NR, --CR.sub.2 and --S; Y is either C or S; Z is selected from the group consisting of --OR, --NR.sub.2, --CR.sub.3, --SR, --SiR.sub.3, --PR.sub.2 or H; n is 1 or 2; A 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, germanium, silicon and alkyl phosphine; and m is 1 to 7, preferably 2 to 6, most preferably 2 or 3.
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Karol Frederick J.
Reichle Walter T.
Whiteker Gregory T.
Leuzzi P. W.
Nagumo Mark
Union Carbide Chemicals & Plastics Technology Corporation
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