Olefin polymerization catalyst
AssigneeStandard Oil Company (Indiana)
InventorsGregory G. Arzoumanidis, Benjamin S. Tovrog
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Abstract
A propylene polymerization catalyst comprises (a) a titanium-containing component formed by reducing titanium tetrachloride with an aluminum alkyl, optionally contacting the resulting reduced solid with a pretreatment amount of alpha-olefin monomer under polymerization conditions, and reacting the resulting product with a Lewis base complexing agent and additional titanium tetrachloride, and (b) an alkyl aluminum halide having a halogen/aluminum atomic ratio between 0.89 and 0.98 and preferably between 0.92 and 0.98.
Claims20
A process for polymerization of propylene or a mixture of propylene and a minor amount of copolymerizable alpha-olefin comprising contacting in the vapor phase propylene or a mixture of propylene and a copolymerizable alpha-olefin with a catalyst comprising:
- A. a solid titanium-containing component formed by steps comprising (1) reducing titanium tetrachloride with an aluminum alkyl and (2) reacting the resulting solid with a Lewis base complexing agent and a Lewis acid;
- and
- B. an ethyl aluminum halide having a halogen/aluminum atomic ratio between 0.89 and 0.98.
Dependencies are inferred from the claim text.