Catalysts for polymerizing ethylene
AssigneeMontedison S.p.A.
InventorsLuciano Noristi, Giovanni Baruzzi
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Abstract
Catalysts for polymerizing ethylene to high yields of polyethylene having a controlled particle size are disclosed. The catalysts are prepared from new catalyst-forming components which are the reaction products of solid halogenated titanium compounds, Grignard compounds and halogenating agents. Said components, on mixing with organometallic compounds of metals belonging to Groups I-III of the Mendelyeev Periodic Table result in the catalysts capable of polymerizing ethylene to polyethylene having a controlled particle size.
Claims4
The process for preparing components of catalysts for polymerizing ethylene or mixtures thereof with minor amounts of alpha-olefins of formula CH.sub.2 .dbd.CHR, in which R is an alkyl radical containing from 1 to 6 carbon atoms, said components comprising the product obtained by reacting a solid halogenated Ti compound selected from the group consisting of TiCl.sub.3 and Ti halogen-alcoholates with a Grignard compound having the formula RMgX, in which R is an alkyl, cycloalkyl or aryl radical containing from 2 to 16 carbon atoms, and X is Cl or Br, in an aliphatic hydrocarbon, at a temperature between 35.degree. and 40.degree. C. and a Grignard compound/titanium compound molar ratio equal to at least 7, isolating the solid reaction product, and reacting it with a halogenating agent at a temperature between 0.degree. and 150.degree. C. and a halogenating agent/Grignard compound molar ratio higher than 0.5, said halogenating agent being selected from the group consisting of TiCl.sub.4, SiCl.sub.4 and PCl.sub.3.
Dependencies are inferred from the claim text.