Silica-coated alumina activator-supports, and catalyst compositions containing these activator-supports, are disclosed. Methods also are provided for preparing silica-coated alumina activator-supports, for preparing catalyst compositions, and for using the catalyst compositions to polymerize olefins.

A method for producing a solid catalyst component for olefin polymerization produces a novel solid catalyst component for olefin polymerization that achieves excellent olefin polymerization activity and activity with respect to hydrogen during polymerization, and can produce an olefin polymer that exhibits a high MFR, high stereoregularity, and excellent rigidity. The method includes a first step that brings a magnesium compound, a tetravalent titanium halide compound, and one or more first internal electron donor compounds selected from specific aromatic dicarboxylic diesters into contact with each other to effect a reaction, followed by washing, a second step that brings a tetravalent titanium halide compound and one or more second internal electron donor compounds into contact with a product obtained by the first step to effect a reaction, followed by washing, and a third step that brings one or more third internal electron donor compounds into contact with a product obtained by the second step to effect a reaction.

Group 4 transition metal complexes of bidentate iminonaphthol pro-ligands can be used as catalysts to polymerize olefins, such as ethylene. Group 4 transition metal complexes of bidentate iminonaphthol pro-ligands can have a single-site nature, allowing the catalysts to be used to prepare ultra high molecular weight polyethylene having a narrow molecular weight distribution.

A catalyst system for the polymerization of olefins may include a first solid catalytic component and a second solid catalytic component. The first solid catalytic component may include: a spherical MgCl.sub.2-xROH support; a group 4-8 transition metal; and a diether internal electron donor. The second solid catalytic component may include: a spherical MgCl.sub.2-xROH support; a group 4-8 transition metal; and a diether internal electron donor. The first solid catalytic component produces a propylene homopolymer having a Xylene Solubles (XS) value of greater than 2 wt %; and the second solid catalytic component produces a propylene homopolymer having a XS value of less than 2 wt %. The second catalytic component may act as an external electron donor during use, and embodiments herein do not require use of any additional external electron donors to control polymerization and reliably vary the properties of the resulting polymer.

A method for protecting a phenol group on a precursor compound is provided. The method includes reacting the phenol group with dihydropyran in an acid catalyzed protection reaction and quenching the protection reaction with a strong base within less than about 60 seconds to form a protected precursor compound.

Provided are a solid titanium catalyst component for ethylene polymerization which can polymerize ethylene at a high activity and which can provide an ethylene polymer having an excellent particle property, an ethylene polymerization catalyst and an ethylene polymerization method in which the catalyst is used. The solid titanium catalyst component (I) for ethylene polymerization according to the present invention is obtained by bringing a liquid magnesium compound (A) including a magnesium compound, an electron donor (a) having 1 to 5 carbon atoms and an electron donor (b) having 6 to 30 carbon atoms into contact with a liquid titanium compound (C) under the presence of an electron donor (B) and includes titanium, magnesium and a halogen. The ethylene polymerization catalyst of the present invention includes the component (I) and an organic metal compound catalyst component (II). Further, the ethylene polymerization method of the present invention is a method for polymerizing ethylene under the presence of the catalyst.

The present invention relates to solid catalyst components comprising a reaction product of a titanium compound, a magnesium compound, an alcohol, an aluminum alkoxide, a siloxane mixture, and a maleate derivative; and catalyst systems comprising the solid catalyst components and organoaluminum compounds. The present invention also relates to methods of making the solid catalyst components and the catalyst systems, and methods of polymerizing or copolymerizing ethylene using the catalyst systems.

Procatalyst comprising an inorganic support, a chlorine compound carried on said support, a magnesium compound carried on said support, a titanium compound carried on said support, and a compound comprising two oxygen containing rings, wherein said two rings are linked via a bridge selected from the group consisting of carbon bridge, silicon bridge, ethane-1.2-diyl bridge, ethene-1,2-diyl bridge, alkylaminomethyl bridge and imine bridge.

Octaaminonaphthalene and a method of synthesizing octaaminonaphthalene are described. A two-dimensional coordination polymer and a method of synthesizing the two-dimensional coordination polymer are described. The two-dimensional coordination polymer includes ligands including anchorage sites, and metal linkers, each metal linker including a metal and an organic moiety. Each metal linker is coupled to two ligands via the anchorage sites. Synthesizing the two-dimensional coordination polymer includes contacting a first liquid precursor with a second liquid precursor at an interface, reacting the metal linker and the water-soluble ligand to yield a two-dimensional coordination polymer at the interface, and removing the two-dimensional coordination polymer from the interface.

Provided are a ligand compound having Formula 1, which exhibits high catalytic activity while exhibiting high 1-hexene and 1-octene selectivity, thereby allowing ethylene oligomerization to be achieved with excellent efficiency, an organic chromium compound, a catalyst composition including the organic chromium compound, and a method for oligomerizing ethylene by using the same;

##STR00001## wherein all the variables are described herein.