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1. (WO1991005810) OLEFIN POLYMERIZATION CATALYST FROM TRIALKYLALUMINUM MIXTURE, SILICA GEL AND A METALLOCENE
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CLAIMS :

1. 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.

2. The catalyst of claim 1 wherein the mole ratio of TMA to TIBA is from about 2:1 to about 1000:1.

3. The catalyst of claim 1 wherein the metallocene is a titanocene, zirconocene, hafnocene or mixtures thereof.

4. The catalyst of claim 1 wherein the water content of the undehydrated silica gel ranges from about 6 to about 20 wt.% based on the total weight of silica gel and water.

5. The catalyst of claim 1 wherein the metallocene is a titanocene, hafnocene, zirconocene or mixtures thereof; the mole ratio of TMA to TIBA is from about 2:1 to about 1000:1; and the moisture content of the undehydrated silica gel is from about 6 wt.% to about 20 wt.% based on the total weight of silica gel and water.

6. 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.

7. The method of claim 6 further comprising removing solvents and drying the catalytic composition to produce a catalyst in powder form.

8. The method of claim 6 wherein the mole ratio of TMA to TIM is from about 2:1 to about 1000:1.

9. The method of claim 6 wherein the metallocene is a titanocene, zirconocene, hafnocene or mixtures thereof.

10. The method of claim 6 wherein the water content of the undehydrated silica gel ranges from about 6 to about 20 wt.% based on the total weight of silica gel and water.

11. The method of claim 6 wherein the metallocene is a titanocene, hafnocene, zirconocene or mixtures thereof; the mole ratio of TMA to TIM is from about 2:1 to about 1000:1; and the moisture content of the undehydrated silica gel is from about 6 wt.% to about 20 wt.% based on the total weight of silica gel and water.

AMENDED CLAIMS
[received by the International Bureau
on 3 April 1991 (03.04.91);
original claims 2 and 8 cancelled; original claims 1,5,6 and
11 amended; other claims unch.anged (2 pages)]

1. A catalyst for the polymerization of 1-olefins comprising the reaction product of:
(a) undehydrated silica gel;
(b) a mixture of trimethylaluminum and
triisobutylaluminum wherein the mole ratio of TMA to TIBA is from about 2:1 to about 1000:1; and
(c) a metallocene component selected from the group consisting of Group IVB metallocenes, Group VB
metallocenes and mixtures thereof.

3. The catalyst of claim 1 wherein the metallocene is titanocene, zirconocene, hafnocene or mixtures thereof.

4. The catalyst of claim 1 wherein the water content of the undehydrated silica gel ranges from about 6 to about 20 wt.% based on total weight of silica gel and water.

5. The catalyst of claim 1 wherein the metallocene is a titanocene, hafnocene, zirconocene or mixtures thereof and the moisture content of the undehydrated silica gel is from about 6 wt.% to about 20 wt.% based on the total weight of silica gel and water.

6. A method of preparing a catalyst active for the polymerization of 1-olefins comprising:
(i) reacting a mixture of triisobutylaluminum and trimethylaluminum wherein the mole ratio of TMA to TIBA is from about 2:1 to 1000:1 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.

7. The method of claim 6 further comprising removing solvents and drying the catalytic composition to produce a catalytic in powder form.

9. The method of claim 6 wherein the metallocene is a titanocene, zirconocene, hafnocene or mixtures thereof.

10. The method of claim 6 wherein the water content of the undehydrated silica gel ranges from about 6 to about 20 wt.% based on the total weight of silica gel and water.

11. The method of claim 6 wherein the metallocene is a titanocene, hafnocene, zirconocene or mixtures thereof and the moisture content of the undehydrated silica gel is from about 6 wt.% to about 20 wt.% based on the total weight of silica gel and water.