The present invention relates to a multi-stage process for producing a C.sub.2 to C.sub.8 olefin polymer composition in a process comprising at least two reactors, wherein a pre-polymerized solid Ziegler-Natta catalyst is prepared by carrying out an off-line pre-polymerization of a solid Ziegler-Natta catalyst component with a C.sub.2 to C.sub.4 olefin monomer before feeding to the polymerization process.

A bimodal linear polyethylene composition, products made therefrom, methods of making and using same, and articles containing same.

Embodiments of this disclosure are directed to catalyst systems comprising a metal-ligand complex according to formula (I).

##STR00001##

The present invention relates to a novel metallocene catalyst compound for the production of a polyolefin resin having a high molecular weight and a wide molecular weight distribution or a method of preparing the same, and more particularly to a metallocene catalyst compound using a ligand containing a Group 15 or 16 element having a bulky substituent or a method of preparing the same. The present invention provides a novel metallocene catalyst compound represented by Chemical Formula 1 below.
(L.sup.1){(N-L.sup.2)Z.sup.1(Y)Z.sup.2(N-L.sup.3)}(X)M  [Chemical Formula 1]

This invention relates to transition metal complexes represented by the formula: ##STR00001##
catalyst systems comprising the complexes, and polymerization methods for olefinic monomers using the catalyst systems. In said formula, M is a transition metal; E is NR.sup.2, CR.sup.3R.sup.4, O, S, or SiR.sup.5R.sup.6; Q is optional substitution; p is an integer ranging from 0 to 3; L is an optional neutral ligand; m is an integer ranging from 0 to 3; X is an anionic leaving group; n is 1 or 2, with m+n being 4 or less; J is a linker group contributing two or three atoms that are located within a first chelate ring; R.sup.1 and R.sup.1′ are independently a hydrocarbyl group or a trihydrocarbylsilyl group; R.sup.2 is a hydrocarbyl group; R.sup.3 and R.sup.4 are independently H, a hydrocarbyl group, or a trihydrocarbylsilyl group; and R.sup.5 and R.sup.5 are independently a hydrocarbyl group.

Embodiments are directed to a metal complex formed, wherein the metal complexes are used as pro-catalyst in polyolefin polymerization and comprise the following structure (Formula (I)). ##STR00001##

Method of preparing a molecular catalyst from a mixture comprising a (C.sub.5-C.sub.7)alkane, a spray-dried alkylaluminoxane, and a molecular procatalyst. Molecular catalysts prepared by the method may be screened.

Method of preparing a molecular catalyst from a mixture comprising a (C.sub.5-C.sub.7)alkane, a spray-dried alkylaluminoxane, and a molecular procatalyst. Molecular catalysts prepared by the method may be screened.

A process to produce a branched ethylene-α-olefin diene elastomer comprising combining a catalyst precursor and an activator with a feed comprising ethylene, C3 to C12 α-olefins, and a dual-polymerizable diene to obtain a branched ethylene-α-olefin diene elastomer; where the catalyst precursor is selected from pyridyldiamide and quinolinyldiamido transition metal complexes. The branched ethylene-α-olefin diene elastomer may comprise within a range from 40 to 80 wt % of ethylene-derived units by weight of the branched ethylene-α-olefin diene elastomer, and 0.1 to 2 wt % of singly-polymerizable diene derived units, 0.1 to 2 wt % of singly-polymerizable diene derived units, and the remainder comprising C3 to C12 α-olefin derived units, wherein the branched ethylene-α-olefin diene elastomer has a weight average molecular weight (M.sub.w) within a range from 100 kg/mole to 300 kg/mole, an average branching index (g′.sub.avgg) of 0.9 or more, and a branching index at very high M.sub.w (g′.sub.1000) of less than 0.9.

Polymerization processes to produce polyolefin polymers, for example, polyethylene polymers, from catalyst systems comprising one or more olefin polymerization catalysts and at least one activator are provided. The polyolefin polymers may have a Broad Orthogonal Composition Distribution (BOCD).