In the present invention, there is provided an olefin polymer which has excellent processability and dimensional stability and thus is useful for hollow molding of pipes or the like.

A preparation method for a metallocene compound is provided. The method includes: stirring at least one compound I among compounds expressed by the following chemical formula (I) and a hydrogenation reaction catalyst of 0.10 to 0.55 parts by weight based on 100 parts by weight of the compound I under a hydrogen atmosphere; and obtaining a metallocene compound containing at least one first compound among the compounds expressed by the following chemical formula (1). Chemical formula (I) and (1) are provided in the specification.

This invention relates to metallocene compounds represented by the formula:

##STR00001##

catalyst systems comprising said metallocene compound and an activator or a reaction product of the metallocene compound with the at least one activator, and polymerization processes using such metallocene compounds and activators, where Cp.sub.a and Cp.sub.b are optionally-substituted cyclopentadienyl rings; A is bridging group; q is zero or 1; Q is O, O(CR.sup.3R.sup.4).sub.m, (CR.sup.3R.sup.4).sub.mO, or (CR.sup.3R.sup.4).sub.m; m is 0 to 18; Z is (CR.sup.3R.sup.4).sub.2; LA is a Lewis acid; M is a transition metal; X.sup.1 and X.sup.2 are independently R.sup.5 or OR.sup.5; R.sup.1 and R.sup.2 are independently selected from optionally-substituted hydrocarbyl groups; R.sup.3 and R.sup.4 are independently selected from the group consisting of H, halogen, and an optionally-substituted hydrocarbyl group; and R.sup.5 is alkyl, aryl, perfluoroalkyl, or perfluoroaryl.

The present invention relates to a metallocene complex with a heteroatom-containing -ligand, having a chemical structure represented by formula (I) as below:

##STR00001## wherein M is a transition metal element from Group 3, Group 4, Group 5 and Group 6 in the periodic table, including lanthanides and actinides; X, being the same as or different from each other, is selected from hydrogen, halogen, an alkyl group R, an alkoxyl group OR, a mercapto group SR, a carboxyl group OCOR, an amino group NR.sub.2, a phosphino group PR.sub.2, OR.sup.O and OSO.sub.2CF.sub.3; n is an integer from 1 to 4 and is not zero; the charge number resulted from multiplying n by the charge number of X equals to the charge number of the central metal atom M minus 2; Q is a divalent radical; A is a -ligand; and Z is a -ligand; the process for producing the same; a catalyst system of the same; and use of the catalyst system.

The present invention provides a metallocene supported catalyst that can prepare a polyolefin having excellent transparency even when processed into a film, as well as excellent processibility and mechanical properties, with high catalytic activity, and a method for preparing a polyolefin using the same.

Methods for the production of heterophasic polymers in gas and slurry phase polymerization processes, and polymer compositions made therefrom, are disclosed herein.

Disclosed is a method for producing a polyolefin including: (1) a step (1) of polymerizing one or more olefins in solution polymerization or slurry polymerization in the presence of a polymerization catalyst to produce a polymer solution, (2) a step (2) of taking out the polymer solution obtained in the step (1), and adding a catalyst deactivator in the polymer solution to deactivate the polymerization catalyst, and (3) a step (3) of removing volatile components in vacuum from the polymer solution where the polymerization catalyst has been deactivated, and including, between the step (2) and the step (3), a step of adding an additive to the polymer solution when the water concentration in the polymer solution is 5 ppm by mass or less.

Provided is an ethylene/alpha-olefin copolymer having excellent environmental stress crack resistance.

The present disclosure provides a method for preparing a supported hybrid metallocene catalyst which can be used to prepare a polyolefin, a supported hybrid metallocene catalyst prepared by using the method, and a method for preparing a polyolefin using the supported hybrid metallocene catalyst.

The present disclosure relates to a supported hybrid metallocene catalyst and a method for preparing a polyolefin using the same. When the supported hybrid metallocene catalyst according to the present disclosure is used, a polyolefin with a multimodal molecular weight distribution and excellent environmental stress crack resistance can be prepared.