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, and (C) a chain shuttling agent.

Hydrogenation catalysts for aromatic hydrogenation including an organosilica material support, which is a polymer comprising independent units of a monomer of Formula [Z.sup.1OZ.sup.2OSiCH.sub.2].sub.3 (I), wherein each Z.sup.1 and Z.sup.2 independently represent a hydrogen atom, a C.sub.1-C.sub.4 alkyl group or a bond to a silicon atom of another monomer; and at least one catalyst metal are provided herein. Methods of making the hydrogenation catalysts and processes of using, e.g., aromatic hydrogenation, the hydrogenation catalyst are also provided herein.

Hydrogenation catalysts for aromatic hydrogenation including an organosilica material support, which is a polymer comprising independent units of a monomer of Formula [Z.sup.1OZ.sup.2OSiCH.sub.2].sub.3 (I), wherein each Z.sup.1 and Z.sup.2 independently represent a hydrogen atom, a C.sub.1-C.sub.4 alkyl group or a bond to a silicon atom of another monomer; and at least one catalyst metal are provided herein. Methods of making the hydrogenation catalysts and processes of using, e.g., aromatic hydrogenation, the hydrogenation catalyst are also provided herein.

Disclosed are nitrogen titanium complexes having general formula (I) or (II). Catalytic systems that include the nitrogen titanium complexes and that can be used for the (co)polymerization of conjugated dienes are disclosed. Processes for (co)polymerization of conjugated dienes using the catalytic systems are also disclosed.

A catalyst for olefin polymerization containing at least one metal complex comprising at least one SF.sub.5 group attached to a ligand bound to the metal. The invention further relates to catalyst, a process for making polyolefins and dispersions of UHMWPE.

A catalyst for olefin polymerization containing at least one metal complex comprising at least one SF.sub.5 group attached to a ligand bound to the metal. The invention further relates to catalyst, a process for making polyolefins and dispersions of UHMWPE.

This invention relates to mono cyclopentadienyl pyridyl hydroxyl amine catalyst compounds represented by Formula I(a) or I(b): ##STR00001##
wherein: M is a group 3-12 metal; R.sup.1 is a hydrocarbyl group or a silyl group; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, and R.sup.10 are independently selected from the group consisting of hydrogen, hydrocarbyl, alkoxy, silyl, amino, aryloxy, halogen and phosphino, wherein any two adjacent R groups may be joined to form a saturated or unsaturated single or multicyclic hydrocarbyl ring or heterocyclic ring; and each X.sup.1 and X.sup.2 is independently an anionic leaving group or X.sup.1 and X.sup.2 may be joined together to form a dianionic group.

An organometallic complex, a catalyst composition employing the same, and a method for preparing polyolefin are provided. The organometallic compound has a structure represented by Formula (I) ##STR00001##
wherein M is Ti, Zr, or Hf; X is O, or NR.sup.6; R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1-6 alkyl group, C.sub.6-12 aryl group, or R.sup.1 and R.sup.2 are combined with the carbon atoms, to which they are attached, to form an C.sub.6-12 aryl moiety; R.sup.3, R.sup.4 and R.sup.5 are independently fluoride, chloride, bromide, C.sub.1-6 alkyl group, C.sub.6-12 aryl group, C.sub.3-6 hetero aryl group, C.sub.7-13 aryl alkyl group or C.sub.7-12 alkyl aryl group; and R.sup.6 is hydrogen, C.sub.6-12 aryl group or C.sub.7-12 alkyl aryl group.

An organometallic complex, a catalyst composition employing the same, and a method for preparing polyolefin are provided. The organometallic compound has a structure represented by Formula (I) ##STR00001##
wherein M is Ti, Zr, or Hf; X is O, or NR.sup.6; R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1-6 alkyl group, C.sub.6-12 aryl group, or R.sup.1 and R.sup.2 are combined with the carbon atoms, to which they are attached, to form an C.sub.6-12 aryl moiety; R.sup.3, R.sup.4 and R.sup.5 are independently fluoride, chloride, bromide, C.sub.1-6 alkyl group, C.sub.6-12 aryl group, C.sub.3-6 hetero aryl group, C.sub.7-13 aryl alkyl group or C.sub.7-12 alkyl aryl group; and R.sup.6 is hydrogen, C.sub.6-12 aryl group or C.sub.7-12 alkyl aryl group.

The present invention relates to novel polymerization catalysts. More particularly, the present invention relates to a novel catalysts for the preparation of ultra high molecular weight polyethylene (UHMWPE) and process for preparation thereof. The present invention further relates to a process for the preparation of disentangled ultra high molecular weight polyethylene (dis-UHM-WPE).