A modified spray-dried Ziegler-Natta (pro)catalyst system comprising a Ziegler-Natta (pro)catalyst, a carrier material, and a tetrahydrofuran/ethanol modifier; polyolefins; methods of making and using same; and articles containing same.

A modified spray-dried Ziegler-Natta (pro)catalyst system comprising a Ziegler-Natta (pro)catalyst, a carrier material, and a tetrahydrofuran/ethanol modifier; polyolefins; methods of making and using same; and articles containing same.

An activated, titanium-based, spray-dried Ziegler-Natta catalyst system containing a titanium-based Ziegler-Natta catalyst, a carrier material, and an activator mixture comprising an effective amount of an activator mixture comprising triethylaluminum and diethylaluminum chloride for producing a substantially uniform comonomer composition distribution. Also, polyolefins; methods of making and using same; and articles containing same.

An activated, titanium-based, spray-dried Ziegler-Natta catalyst system containing a titanium-based Ziegler-Natta catalyst, a carrier material, and an activator mixture comprising an effective amount of an activator mixture comprising triethylaluminum and diethylaluminum chloride for producing a substantially uniform comonomer composition distribution. Also, polyolefins; methods of making and using same; and articles containing same.

A titanium complex useful for producing a titanium-containing thin film under low temperature deposition conditions without using an oxidative gas is provided. A titanium complex represented by the general formula (1) (wherein each of R.sub.1 and R.sub.2 is independently a C.sub.1-6 alkyl group which may be bonded with each other to form a ring, X is CR.sub.3 or a N atom, Y is CR.sub.4 or a N atom, Z is CR.sub.5 or a N atom, each of R.sub.3, R.sub.4 and R.sub.5 is independently a hydrogen atom or a C.sub.1-6 alkyl group, and n is an integer of from 1 to 3).

A titanium complex useful for producing a titanium-containing thin film under low temperature deposition conditions without using an oxidative gas is provided. A titanium complex represented by the general formula (1) (wherein each of R.sub.1 and R.sub.2 is independently a C.sub.1-6 alkyl group which may be bonded with each other to form a ring, X is CR.sub.3 or a N atom, Y is CR.sub.4 or a N atom, Z is CR.sub.5 or a N atom, each of R.sub.3, R.sub.4 and R.sub.5 is independently a hydrogen atom or a C.sub.1-6 alkyl group, and n is an integer of from 1 to 3).

A preparation method of bimetallic catalysts based on anthracene frameworks and use thereof in olefin polymerization is reported. Anthrecene frameworks were introduced, heat resistance of the catalysts is improved, and by changing central metals and configurations of the frameworks, steric and electronic effects of the metal catalysts of this model can be adjusted and controlled conveniently, and polyolefin polymer materials of different structures and different properties can be prepared, the bimetallic catalyst can be used in ethylene homopolymerization for preparation of high density polyethylene, ethylene/1-octene copolymerization for preparation of polyolefin elastomers and ethylene/norbornene copolymerization for preparation of cycloolefin copolymers. The bimetallic catalyst based on anthracene frameworks can be used in olefin high temperature solution polymerization for preparing polyolefin elastomers and cycloolefin copolymers, the polyolefin elastomers obtained have molecular weights as high as M.sub.W=890 kg.Math.mol.sup.−1, and the cycloolefin copolymers have copolymerization monomer insertion rates as high as 45 mol %.

A preparation method of bimetallic catalysts based on anthracene frameworks and use thereof in olefin polymerization is reported. Anthrecene frameworks were introduced, heat resistance of the catalysts is improved, and by changing central metals and configurations of the frameworks, steric and electronic effects of the metal catalysts of this model can be adjusted and controlled conveniently, and polyolefin polymer materials of different structures and different properties can be prepared, the bimetallic catalyst can be used in ethylene homopolymerization for preparation of high density polyethylene, ethylene/1-octene copolymerization for preparation of polyolefin elastomers and ethylene/norbornene copolymerization for preparation of cycloolefin copolymers. The bimetallic catalyst based on anthracene frameworks can be used in olefin high temperature solution polymerization for preparing polyolefin elastomers and cycloolefin copolymers, the polyolefin elastomers obtained have molecular weights as high as M.sub.W=890 kg.Math.mol.sup.−1, and the cycloolefin copolymers have copolymerization monomer insertion rates as high as 45 mol %.

Provided are a metal-ligand complex having both a strong electron donor group and an electron withdrawing group by introducing a specific functional group, difluoromethylene group, into an oxygen-oxygen bridge, a catalyst composition for ethylene-based polymerization containing the same, and a preparation method of an ethylene-based polymer using the same. The metal-ligand complex according to the present invention and the catalyst composition containing the same may be very usefully used in the preparation of an ethylene-based polymer having excellent physical properties.

Provided are a metal-ligand complex having both a strong electron donor group and an electron withdrawing group by introducing a specific functional group, difluoromethylene group, into an oxygen-oxygen bridge, a catalyst composition for ethylene-based polymerization containing the same, and a preparation method of an ethylene-based polymer using the same. The metal-ligand complex according to the present invention and the catalyst composition containing the same may be very usefully used in the preparation of an ethylene-based polymer having excellent physical properties.