High activity catalyst prepared with alkoxysilanes
Номер патента: EP1017493A1
Опубликовано: 12-07-2000
Автор(ы): Robert Ivan Mink, Thomas Edward Nowlin
Принадлежит: ExxonMobil Oil Corp, Mobil Oil Corp
Опубликовано: 12-07-2000
Автор(ы): Robert Ivan Mink, Thomas Edward Nowlin
Принадлежит: ExxonMobil Oil Corp, Mobil Oil Corp
Реферат: An ethylene-alpha-olefin copolymerization catalyst is prepared by impregnating a silica calcined at elevated temperature sequentially with an organomagnesium compound such as dialkylmagnesium compound, a silane compound which is free of hydroxyl groups, such as tetraethyl orthosilicate. A transition metal component such as titanium tetrachloride is then incorporated into the support. Unexpectedly, the calcination temperature of the silica used to prepare the catalyst precursors has a strong influence on polymer product properties. By increasing the calcination temperature of the silica from 600° to 700 °C or higher temperatures, a catalyst precursor when activated produces ethylene/1-hexene copolymers with narrower molecular weight distributions (MWD) as manifested by a decrease of resin MFR values of ∩3-4 units. Activation of this catalyst precursor with a trialkylaluminum compound results in a catalyst system which is effective for the production of ethylene copolymers.
High activity catalyst prepared with alkoxysilanes
Номер патента: US6291384B1. Автор: Thomas E. Nowlin,Robert I. Mink. Владелец: Mobil Oil Corp. Дата публикации: 2001-09-18.