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7137 results about "Organic Silicon Compounds" patented technology

Organosilicon chemistry is the corresponding science of their preparation and properties. Most organosilicon compounds are similar to the ordinary organic compounds, being colourless, flammable, hydrophobic, and stable to air. Silicon carbide is an inorganic compound.

Olefin polymerization catalyst and process for preparing polypropylene and propylene block copolymer

The present invention provides olefin polymerization catalysts and processes for preparing a polypropylene and a propylene block copolymer using the olefin polymerization catalysts. The olefin polymerization catalyst (1) of the invention is formed from: (I-1) a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (C) a specific organosilicon compound; (II-1) (D) a specific polyether compound; and optionally, (III) an organometallic compound catalyst component. The olefin polymerization catalyst (2) of the invention is formed from: (I-2) a contact product obtained by contacting: (A) a solid titanium catalyst component, (B) an organometallic compound catalyst component, and (D) a specific polyether compound; (II-2) (C) a specific organosilicon compound; and optionally, (III) an organometallic compound catalyst component. The propylene is polymerized in the presence of the above-mentioned olefin polymerization catalysts to prepare highly isotactic polypropylene. The propylene block copolymer is prepared by the steps of polymerizing propylene to form a polypropylene component and copolymerizing ethylene and an alpha-olefin of 3 to 20 carbon atoms to form an ethylene / alpha-olefin copolymer component in the presence of the polymerization catalysts.
Owner:MITSUI CHEM INC
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