| 摘要 |
<p>There are disclosed components of catalyst for polymerizing ethylene and mixtures of ethylene with alpha-olefins comprising the reaction product of (A) a magnesium compound, such as Mg-chloride, Mg-alcoholate or a Grignard compound, with (B) a titanium, vanadium or zirconium compound having at least two metal-oxygen bonds, such as a tetra-alcoholate, and with (C) a halogenated compound of metals of B, such as Ti tetrachloride. According to an aspect of the invention, the reaction product (A) + (B), before being reacted with (C), is treated with a silicium compound having a halogenating and/or reducing action. The catalysts according to the invention are suitable for obtaining ethylene polymers having a broad distribution of molecular weights.</p> |
