05-01-1983 дата публикации
Номер: EP0068255A1
1. A process for the polymerization of a 1-olefin of the formula R**4 CH = CH2 in which R**4 denotes hydrogen or an alkyl radical having 1 to 10 carbon atoms, in the presence of a catalyst composed of the product from the reaction of a magnesium alcoholate with titanium tetrachloride (component A) and an organometallic compound of Groups I to III of the periodic system (component B), which comprises carrying out polymerization in the presence of a catalyst in which the component A has been prepared by a procedure in which, in a first reaction stage, a magnesium alcoholate is reacted with titanium tetrachloride in a hydrocarbon at a temperature of 50 to 100 degrees C, the soluble constituents are then removed by washing with a hydrocarbon, the resulting solid is suspended in a hydrocarbon and is subjected, in a second reaction stage, to a heat treatment at a temperature of 110 to 200 degrees C, with the addition of TiCl4 , for 8 to 100 h, and the solid is then freed from soluble reaction products by washing several times with a hydrocarbon.
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