ZR/V multi-site olefin polymerization catalyst

A catalyst consisting essentially of the product obtained by admixing:

• (a) a zirconium composition having the formula ZrX.sub.a.sup.1 (OR.sup.1).sub.4-a wherein X.sup.1 is halogen, R.sup.1 is hydrocarbyl having 1 to about 18 carbon atoms and a is 0 or an integer from 1 to 4 and mixtures thereof;
• (b) a vanadium composition selected from the group consisting of compounds having the formula VX.sub.c.sup.2 (OR.sup.2).sub.b-c wherein X.sup.2 is halogen, R.sup.2 is hydrocarbyl having 1 to about 18 carbon atoms b is the valence of vanadium and is 3 or 4 and c is 0 or an integer from 1 to b, VOX.sub.d.sup.3 (OR.sup.3).sub.3-d wherein X.sup.3 is halogen, R.sup.3 is hydrocarbyl having 1 to about 18 carbon atoms and d is 0 or an integer from 1 to 3, VOX.sub.2.sup.4 wherein X.sup.4 is halogen, and mixtures thereof;
• and
• (c) an activator selected from the group consisting of compounds having the formula ZnX.sub.2.sup.5 . 2AlR.sub.3.sup.4 wherein X.sup.5 is halogen, R.sup.4 is hydrocarbyl having 1 to about 12 carbon atoms, Al.sub.2 R.sub.3.sup.6 X.sup.7 wherein R.sup.6 is hydrocarbyl having 1 to about 12 carbon atoms and X.sup.7 is halogen, MgR.sub.f.sup.7 Y.sub.2-f wherein R.sup.7 is hydrocarbyl having 1 to about 12 carbon atoms, Y has the formula OR.sup.8 wherein R.sup.8 is hydrocarbyl having 1 to 12 carbon atoms or Y is a silyl amide having the formula N(SiR.sub.3.sup.9).sub.2 wherein R.sup.9 is hydrocarbyl having 1 to about 12 carbon atoms and f is 0, 1 or 2, and mixtures thereof.