Catalyst systems and methods for making and using the same. A catalyst system can include a non-metallocene catalyst having the structure: wherein M is a group 4 element, each of R.sup.13-R.sup.20 are independently a hydrogen or a methyl group, wherein at least one of R.sup.13-R.sup.20 is a methyl group, Ar is an aryl group or a substituted aryl group, Ar′ is an aryl group or a substituted aryl group, and each X is, independently, a hydride group, an amide, a benzyl group, a methyl group, a chloro group, a fluoro group, or a hydrocarbyl group.

The present invention relates to a hybrid supported metallocene catalyst including at least first metallocene compound, at least one second metallocene compound, at least one cocatalyst compound, and a carrier, a preparation method therefor, and a polyolefin resin polymerized in the presence of the catalyst, wherein the second metallocene compound is a compound of a bridged structure having a ligand of an asymmetric structure, and the polyolefin resin has a density of 0.910 g/cm.sup.3 to 0.960 g/cm.sup.3, a molecular weight density in a unimodal distribution of 3 to 5, a melt index of 0.05 to 100 at 2.16 kg, and a melt flow rate of 20 to 40.

The present disclosure relates to dual catalyst systems and processes for use thereof. The present disclosure further provides a catalyst system that is a combination of at least two hafnium metallocene catalyst compounds. The catalyst systems may be used for olefin polymerization processes. The present disclosure further provides for polymers, which can be formed by processes and catalyst systems of the present disclosure.

Catalysts, catalysts systems and methods of polymerizing olefins are provided. The catalyst system may contain two catalysts. Polyolefin polymers are also provided.

A polymerization catalyst system, a method of using the polymerization catalyst system, and a polymer produced with the catalyst system. The polymerization catalyst system has a non-metallocene catalyst and a metallocene catalyst. The metallocene catalyst has the formula: ##STR00001##
wherein R.sup.1 and R.sup.2 are each independently, phenyl, methyl, chloro, fluoro, or a hydrocarbyl group.

A catalyst composition, a method from preparing an olefin polymer using the same, and an olefin polymer prepared from the same are disclosed herein. In some embodiments, a catalyst composition includes a first metallocene compound represented by the Chemical Formula 1, a second metallocene compound represented by the Chemical Formula 2, and a support. The catalyst composition can exhibit high activity in an olefin polymerization reaction and thus contribute to reducing catalyst costs, and can also exhibit high copolymerizability which can secure excellent processability and long-term physical properties, and thus, is suitable for providing polymers for pipes.

A polyethylene composition comprising from about 0.5 to about 20 wt % of alpha-olefin derived units other than ethylene-derived units, with the balance including ethylene-derived units, total internal unsaturations (Vy1+Vy2+T1) of from about 0.10 to about 0.40 per 1000 carbon atoms, an MI of from about 0.1 to about 6 g/10 min, an HLMI of from about 5.0 to about 40 g/10 min, a density of from about 0.890 to about 0.940 g/ml, a Tw.sub.1-Tw.sub.2 value of from about −25 to about −20° C., an Mw.sub.1/Mw.sub.2 value of from about 1.2 to about 2.0, an Mw/Mn of from about 4.5 to about 12, an Mz/Mw of from about 2.0 to about 3.0, an Mz/Mn of from about 7.0 to about 20, and a g′.sub.(vis) greater than 0.90.

Embodiments of the present disclosure directed towards bimodal polymerization catalysts. As an example, the present disclosure provides a bimodal polymerization catalyst system including a non-metallocene olefin polymerization catalyst and a zirconocene catalyst of Formula I: (Formula I) where each of R.sup.1, R.sup.2, and R.sup.4 are independently a C.sub.1 to C.sub.20 alkyl, aryl or aralkyl group or a hydrogen, where R.sup.3 is a C.sub.1 to C.sub.20 alkyl, aryl or aralkyl group, and where each X is independently a halide, C.sub.1 to C.sub.20 alkyl, aralkyl group or hydrogen. ##STR00001##

The present invention relates to a hybrid supported metallocene catalyst and a polyolefin preparation method using the same. Using the hybrid supported metallocene catalyst can not only significantly reduce the amount of wax produced when polymerizing olefin monomers, but can also enhance the stress cracking resistance of the polyolefin that is prepared.

A catalyst composition, a method of preparing a polyolefin including the same, and a polyolefin prepared from the same are disclosed herein. In some embodiments, a catalyst composition comprises a first transition metal compound represented by Chemical Formula 1, and a second transition metal compound represented by Chemical Formula 2, wherein a molar ratio of the first transition compound to the second transition metal compound ranges from 1:0.3 to 1:3.5. The catalyst composition is capable of preparing a polyolefin having excellent mechanical stability, while exhibiting excellent process stability and high polymerization activity during the preparation of a polyolefin in a slurry process.