Provided is a propylene homopolymer or a copolymer of propylene and a 30 wt % or less α-olefin having 2 or 4 to 8 carbon atoms, having a intrinsic viscosity of more than 20 dl/g, as measured in a tetralin solvent at 135° C.

Metallocene complexes represented by the structure below are useful for alpha olefin oligomerization in the presence of an activator to generate polyalphaolefins having a high percentage of vinylidene termination and relatively low Mn values. ##STR00001##
M is a group 4 transition metal. A is a bridging group having one bridging atom extending between a first indenyl ring and a second indenyl ring. Each X is independently an anionic ligand, or two Xs are joined and bound to M to form a metallocycle ring, or two Xs are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand. R.sup.1, R.sup.1′, R.sup.3, R.sup.3′, R.sup.4, R.sup.4′, R.sup.7 and R.sup.7′ are hydrogen. R.sup.5, R.sup.5′, R.sup.6, and R.sup.6′ are independently a C.sub.1-C.sub.10, optionally substituted, hydrocarbyl group, or R.sup.5 and R.sup.6 and/or R.sup.5′ and R.sup.6′ are bonded together to form an optionally substituted hydrocarbyl ring structure.

The present disclosure relates to a catalyst composition and a process for preparation thereof. The catalyst composition of the present disclosure is stable, and produces polyolefin having narrow molecular weight distribution during the polymerization. The process of the present disclosure is simple, cost-effective, and rapid.

A solid catalyst component for the polymerization of olefins made from or containing Mg, Ti and an electron donor of formula (I)

##STR00001##

where the R.sup.1 and R.sup.5 groups, equal to or different from each other, are selected from C.sub.1-C.sub.15 hydrocarbon groups, R.sup.2 group is selected from C.sub.2-C.sub.10 hydrocarbon groups, R.sup.3 to R.sup.4 groups, independently, are selected from hydrogen or C.sub.1-C.sub.20 hydrocarbon groups, optionally fused together to form one or more cycles, with the proviso that at least one of R.sup.3 to R.sup.4 groups is a C.sub.1-C.sub.20 alkyl group.

The present invention provides a novel ligand compound, a transition metal compound and a catalyst composition including the same.

The present invention provides a novel ligand compound, a transition metal compound and a catalyst composition including the same.

The present disclosure relates to olefin polymerization catalysts, and discloses a catalyst component for olefin polymerization or copolymerization and a preparation method therefor, and a catalyst and an application thereof. The catalyst component for olefin polymerization or copolymerization in the present disclosure comprises titanium element, magnesium element, an electron donor, an organic silicon polymer, and an inorganic oxide support, wherein the molecular composition of the organic silicon polymer is [R.sub.xSiO.sub.(4-x)/2].sub.m, wherein R is selected from alkyl, aryl, vinyl or oxygen, x is 0 or more and 2 or less, and the value of m makes the number-average molecular weight of the organic silicon polymer be 1×10.sup.3-1×10.sup.6 g/mol. The catalyst has the characteristics of high activity, good hydrogen-regulating copolymerization performance, high bulk density of resulting polymer powder, and a low content of fine powder in the polymer powder when applied to olefin polymerization, particularly to ethylene and α-olefin polymerization.

Provided is an olefin polymerization catalyst carrier with a general structure formula of Mg(OR.sup.I).sub.n(OR.sup.II).sub.2-n, wherein: 0≦n≦2, and R.sup.I and R.sup.II can be the same or different and are each independently selected from a C.sub.1-C.sub.20 hydrocarbon group. In the X-ray diffraction pattern of the catalyst carrier, there are a set of diffraction peaks in the range of a 2θ diffraction angle of 5°-15°, and the set of diffraction peaks contain 1-4 main diffraction peaks. Also disclosed is an olefin polymerization solid catalyst component which is prepared from the carrier Mg(OR.sup.I).sub.n(OR.sup.II).sub.2-n, a titanium compound, and at least one electron donor compound. In addition, also disclosed is an olefin polymerization catalyst containing the solid catalyst component, at least one organic aluminum compound, and optionally, an external electron donor compound.

Embodiments of a polyethylene polymer blend having a melt index (I.sub.2)<2 g/10 min are provided, wherein the polyethylene polymer blend comprises at least about 50% by wt. of at least one high density polyethylene resin (HDPE) having a density ≧0.950 g/cm3, a melt index (I.sub.2)<4 g/10 min; a melt flow ratio (I.sub.10/I.sub.2)≦9, and a molecular weight distribution (MWD) of about 2 to about 5; and further comprises about 1% to about 20% by wt. of at least one low density polyethylene resin (LDPE) having a density ≦0.930 g/cm3, a melt index (I.sub.2) of about 0.1 to about 10 g/min, and an MWD>3.

Embodiments of a polyethylene polymer blend having a melt index (I.sub.2)<2 g/10 min are provided, wherein the polyethylene polymer blend comprises at least about 50% by wt. of at least one high density polyethylene resin (HDPE) having a density ≧0.950 g/cm3, a melt index (I.sub.2)<4 g/10 min; a melt flow ratio (I.sub.10/I.sub.2)≦9, and a molecular weight distribution (MWD) of about 2 to about 5; and further comprises about 1% to about 20% by wt. of at least one low density polyethylene resin (LDPE) having a density ≦0.930 g/cm3, a melt index (I.sub.2) of about 0.1 to about 10 g/min, and an MWD>3.