Olefin polymerization catalyst from trialkylaluminum mixture, silica gel and a metallocene
AssigneeBP Chemicals Limited
InventorRichard Henry Weatherhead
Life of this patent
Estimating the term…
Abstract
A catalyst system suitable for preparing substantially terminally unsaturated atactic polymers or copolymers of α-olefins having a number average molecular weight in the range 300-500,000 comprises (A) a metallocene complex and (B) a cocatalyst comprising (i) a Group III Metal alkyl compound and (ii) a triaryl boron compound. Preferred metallocenes are those having alkyl ligands on the metal atom. The preferred Group III metal alkyl compound is triisobutyl aluminum and the preferred triaryl boron compounds is tris(pentafluorophenyl)boron.
Claims11
A catalyst for the polymerization of 1-olefins comprising the reaction product of:
- (a) undehydrated silica gel;
- (b) a mixture of trimethylaluminum and triisobutylaluminum:
- and
- (c) a metallocene component selected from the group consisting of Group IVB metallocenes, Group VB metallocenes and mixtures thereof.
A method of preparing a catalyst active for the polymerization of 1-olefins comprising:
- (i) reacting a mixture of triisobutylaluminum and trimethylaluminum with an undehydrated silica gel to form a reaction product;
- (ii) contacting the reaction product with a metallocene component selected from the group consisting of Group IVB metallocenes. Group VB metallocenes and mixtures thereof to produce a catalytic composition.
Dependencies are inferred from the claim text.