Derivatives of Heptaazaphenalene, Methods for Obtaining Them, and Their Use as Protecting Agents Against Uv Radiation
申请人:Trullas Carles
公开号:US20080193398A1
公开(公告)日:2008-08-14
The present invention relates to new heptaazaphenalene derivatives of general Formula (I) and to methods for obtaining them. The physicochemical properties of said compounds allow them to be used as UV radiation absorbents.
Process for forming Ziegler-Natta catalyst for use in polyolefin production
申请人:Vizzini Kayo
公开号:US20050085601A1
公开(公告)日:2005-04-21
The invention provides a process for forming a catalyst for use in the polymerization of olefins. This process comprises reacting a chlorinating agent with a magnesium alkoxide compound to form a magnesium-titanium-alkoxide adduct, followed by reacting the magnesium-titanium-alkoxide adduct with an alkylchloride compound, e.g., benzoyl chloride, to form a magnesium chloride support. The support is then reacted with titanium tetrachloride to form a highly active catalyst useful for the production of polyolefins.