US 5,198,401 A · Ionic metallocene catalyst compositions

Abstract

Ionic catalyst compositions can be prepared by combining two components. The first component is a bis(cyclopentadienyl) Group IV-B metal complex containing at least one ligand which will combine irreversibly with the second component or at least a portion thereof such as a cation portion thereof. The second component comprises a cation which will irreversibly react with at least one ligand on the Group IV-B metal complex and a non-coordinating anion. The combination of the two components produces an ionic catalyst composition comprising a cationic bis(cyclopentadienyl) Group IV-B metal complex which has a formal coordination number of 3 and a 4+ valence charge and the aforementioned non-coordinating anion. The anion is (i) labile and can be displaced by an olefin, diolefin or acetylenically unsaturated monomer; (ii) has a molecular diameter about or greater than 4 angstroms; (iii) forms stable salts with reducible Lewis acids and protonated Lewis bases; (v) has a negative charge delocalized over the framework on the anion or within the core thereof; (v) is not a reducing or oxidizing agent; and (vi) is a relatively poor nucleophile. These ionic catalyst compositions can be used to polymerize .alpha.-olefins, diolefins and/or acetylenically unsaturated monomers, either alone or in combination, to polymers and copolymers.

Claims54

Dependent claims

A composition of matter comprising a Group IV-B metal cation non-coordination anion, which composition is represented by one of the following general formulae:

{[(A--Cp)MX.sub.1 ].sup.+ }.sub.d [B'].sup.d- 1.
{[A--Cp)MX.sub.5 L'].sup.+ }.sub.d [B'].sup.d- 2.
wherein
(A--Cp) is either (Cp)(Cp') or Cp--A'-Cp';
Cp and Cp' are the same or different cyclopentdienyl rings substituted with from zero to five substituent groups S, each substituent group S being, independently, a radical group which is a hydrocarbyl, substituted-hydrocarbyl, halocarbyl, substituted-halocarbyl, hydrocarbyl-substituted organometalloid, halocarbyl-substituted organometalloid or halogen radicals, or Cp and Cp' are cyclopentadienyl rings in which any two adjacent S groups are joined forming a C.sub.4 to C.sub.20 ring to give a saturated or unsaturated polycyclic cyclopentadienyl ligand;
and A' is a bridging group restricting rotation of the Cp and Cp' rings;
M is titanium, zirconium or hafnium;
L' is neutral Lewis base;
X.sub.1 is hydride radical, hydrocarbyl radicals, substituted-hydrocarbyl radicals hydrocarbyl-substituted organometalloid radicals or halocarbyl-substituted organometalloid radical;
X.sub.5 is a hydride radical, hydrocarbyl radical or substituted-hydrocarbyl radical, halocarbyl radical or substituted organometalloid radicals, which radical may optionally be covalently bonded to both M and L';
and
B' is a chemically stable, non-nucleophilic substituted anionic complex having a molecular diameter about or greater than 4 angstroms;
and
d is an integer representing the charge of B'.

11 more elements

Dependencies are inferred from the claim text.

Ionic metallocene catalyst compositions

Life of this patent

Ionic metallocene catalyst compositions

Life of this patent

Abstract

Claims54