Other

China Petrochemical Corporation and Research Institute of Petroleum Processing

China Peirochemical Corporation

Xiaoyu Hong

Zhenhua Jing

Wei Zhang

Junfeng Rong

Xuhua Zhou

Bing Lu

Rong Junfeng

Jinmei Wang

Described are a MgCl based carrier containing Ti(OR) and ROH, wherein R is C &tilde;C alkyl, and solid catalyst components made from said carrier. The carrier and the solid catalyst components according to the present invention are characterized in that their X-rays powder diffraction spectra, one or two main diffraction lines or a halo appears at 2&thgr; of 2&tilde;14&deg; and in the range of 2&thgr; of 14&tilde;50&deg;, there are the characteristic diffraction lines of anhydrous &agr;-MgCl . The carrier according to the present invention is directly obtained by reacting anhydrous magnesium chloride with an alcohol and can be used to prepare solid catalyst components without dealcoholization, and the solid catalyst components exhibit high polymerization activity when employed for polymerizing ethylene.

Magnesium chloride-alcohol carrier and olefin polymerization catalyst components made from the same

Disclosed are polyolefin/clay nanocomposites, comprising 40 to 99.9% by weight of polyolefins and 0.1 to 60% by weight of sepiolite-palygorskite type clays selected from the group essentially consisting of sepiolite and attapulgite. The nanocomposites in accordance with the present invention have excellent mechanical properties and thermal resistance. Also disclosed is a process for preparing the polyolefin/clay nanocomposites according to the present invention.

Polyolefin/clay nanocomposites and process for the preparation thereof

The present invention relates to a process for preparing a carrier used in olefin polymerization catalysts, comprising suspending anhydrous magnesium chloride in an inert hydrocarbon solvent and then under stirring, activating the magnesium chloride with a C -C alcohol at a temperature of 30&deg; C. to 200&deg; C., with the molar ratio of said alcohol to said magnesium chloride being in the range of 0.05 to 2.5. Moreover, in order to make the resultant catalysts more active, the process according to the present invention can further include a pre-dispersing step conducted prior to the activation step, wherein the dispersing agent is alkoxides of titanium or C -C alcohols and the molar ratio of said dispersing agent to said magnesium chloride is 0.01 to 2.0. The catalyst prepared from the resultant carrier is suitable for polymerizing ethylene or compolymerizing ethylene with alpha-olefin.

Process for preparing a carrier used in olefin polymerization catalysts

A process for preparing a supported metallocene/aluminoxane solid catalyst comprises preparing a water-in-oil emulsion of water and an inert solvent by using an emulsifier, adding dropwise the emulsion to a solution of an organoaluminium compound in an inert solvent to carry out the reaction to obtain a suspension of the particulate aluminoxane, followed by adding a solution of a metallocene to the above suspension to support the metallocene on the aluminoxane. The solid catalyst thus obtained can be used in the polymerization and copolymerization of olefins. Polymerization can be carried out by slurry polymerization, bulk polymerization, gas phase polymerization, etc.

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Beijing, China

Xiaoyu Hong