The present disclosure relates to a catalyst system for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first olefin polymerization procatalyst, (B) a second olefin polymerization procatalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by procatalyst (A) under equivalent polymerization conditions, (C) an activator, and (D) a chain shuttling agent.

The present disclosure relates to an olefin polymerization catalyst system for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first olefin polymerization procatalyst, (B) a second olefin polymerization procatalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by procatalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.

This invention relates to novel transition metal catalyst compounds comprising four oxygen atoms bonded to a transition metal where two of the oxygen groups are bond to the metal by dative bonds, catalyst systems comprising such and polymerization processes using such.

A hybrid catalyst composition containing a heterogeneous transition metal compound, a catalyst for olefin polymerization containing the heterogeneous transition metal compound, and a method for preparing an olefin-based polymer in which generation of a gel is suppressed using the catalyst are disclosed. The method for preparing an olefin-based polymer can provide an olefin-based polymer in which non-uniformity of the olefin-based polymer, and in particular, generation of a gel is suppressed.

The solid titanium catalyst component (I) of the present invention contains titanium, magnesium, halogen, and a cyclic multiple-ester-group-containing compound (a) represented by the following formula (1).

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The present disclosure relates to molybdenum and/or tungsten complexes, catalyst systems including molybdenum and/or tungsten complexes, and polymerization processes to produce polyalkenamers such as polypentenamers and polycyclooctenamers.

The present invention relates to an ethylene polymer and a process for preparing the same, wherein the ethylene polymer has an average particle size of 50-3000 ?m, a bulk density of 0.28-0.55 g/cm.sup.3, a true density of 0.930-0.980 g/cm.sup.3, a melt index at a load of 2.16 Kg at 190? C. of 0.01-2500 g/10 min, a crystallinity of 30-90%, a melting point of 105-147? C., a comonomer molar insertion rate of 0.01-5 mol %, a weight-average molecular weight of 2?10.sup.4 g/mol-40?10.sup.4 g/mol, and a molecular weight distribution of 1.8-10. In the preparation process, raw materials containing ethylene, hydrogen gas and a comonomer are subjected to a tank-type slurry polymerization with an alkane solvent having a boiling point of 5-55? C. or a mixed alkane solvent having a saturated vapor pressure of 20-150 KPa at 20? C. as the polymerization solvent in the presence of a polyethylene catalytic system, at the molar ratio of hydrogen gas to ethylene of 0.01-20:1, preferably 0.015-10:1, at the molar ratio of hydrogen gas to the comonomer of 0.1-30:1, preferably 0.15-25:1 to prepare the ethylene polymer.

Disclosed herein are mixed catalyst systems including iron-containing catalyst compounds having a carbene ligand and another catalyst compound, as well as at least one activator. The iron-containing catalyst compounds can be asymmetric, while the other catalyst compound can be symmetric. In some embodiments, the other catalyst compound can be an iron-containing catalyst with a bisiminopyridyl ligand, which does not typically incorporate comonomers in copolymer synthesis. Processes for production of an ethylene alpha-olefin copolymers using these mixed catalyst systems are also disclosed. Ethylene-alpha-olefin copolymers so formed can have at least a portion of their alpha-olefin comonomer distribution increasing with increasing molecular weight, indication orthogonal compositional distribution.

A catalyst component for the polymerization of olefins, comprising Ti, Mg, halogen, an electron donor (ID) selected from the group consisting of aliphatic cyclic ethers and alkyl esters of aliphatic monocarboxylic acids and a compound of a metal selected from the group consisting of Zn and Cu, wherein the catalyst component is devoid of ZnC or CuC bonds and the Mg/Ti molar ratio ranges from 4.0 to 50.0.

A polymerization catalyst supply system is provided. The polymerization catalyst supply system can be used to prepare polyolefin polymers with multimodal or broad molecular weight distribution, or to prepare polyolefins having broad compositional distribution. A process for preparing polyolefin polymers using the polymerization catalyst supply system is also provided.