Patent ID: 6455458
Filing Date: 2002-09-24
Classification: C07F,C08F

Abstract:
A tethered bidentate monocyclopentadienyl heteroatom compound activatable for use as an olefin polymerization catalyst, having the formula: whereinM is Ti, Zr or Hf; each C5H4-xRx is independently a cyclopentadienyl ring substituted with from zero to four substituent groups R, x is a number from 0 to 4 denoting the degree of substitution, and each R is independently a radical selected from the group consisting of C1-C20 hydrocarbyl radicals, C1-C20 substituted hydrocarbyl radicals wherein one or more hydrogen atoms is replaced by a halogen atom, C1-C20 hydrocarbyl-substituted metalloid radicals wherein the metalloid is selected from the group consisting of Group 14 elements, and halogen radicals, or C5H4-xRx is a cyclopentadienyl ring in which two adjacent R-groups are joined to form a C4-C20 ring to give a saturated or unsaturated polycyclic cyclopentadienyl ligand; each J is independently an element with a coordination number of 3 from Group 15; each T is independently a covalent bridging group containing a Group 14 or 15 element; each X is independently a univalent anionic ligand; Q and Qâ€² are independently divalent tethering group containing an element selected from the group consisting of Group 13, 14, 15 and 16 elements; provided that: (i) when Q is a hydrocarbylene diradical, each T independently comprises an alkyl or aryl silicon or germanium radical; (ii) when Q is an oxygen diradical, each T is free of silicon; and (iii) when Q contains silicon, germanium, nitrogen, or phosporus, T is free of carbon.