Back to results
US 5,512,643 AGranted
Process for preparation of syndiocatic vinylidene aromatic polymers using reduced metal catalysts
AssigneeThe Dow Chemical Company
InventorsThomas H. Newman, Karen K. Borodychuk
Life of this patent
Estimating the term…
Abstract
A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst comprising a Group 4 metal complex in the +3 oxidation state and a polyalkylaluminoxane cocatalyst.
Claims7
A process for preparing syndiotactic polymers of vinylidene aromatic monomers comprising contacting one or more vinylidene aromatic monomers under polymerization conditions with a catalytically effective amount of a catalyst comprising a metal complex corresponding to the formula:
- Cp.sub.m Ti(OR).sub.2 X'.sub.p
- wherein:
- Cp is a single .eta.5-cyclopentadienyl or .eta.5-substituted cyclopentadienyl group;
- R is C.sub.1-10 hydrocarbyl;
- X' is an inert, neutral donor ligand;
- and
- p is 0 or 1;
- and a polyalkylaluminoxane activating cocatalyst,
- the molar ratio of monovinylidene aromatic monomer:
- Ti being from 100:1 to 1.times.10.sup.10 :1 and the molar ratio of metal complex:polyalkylaluminoxane being from 1:100 to 1:500.
7 more elements
Dependencies are inferred from the claim text.