Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1980-01-10
1981-11-17
Garvin, Patrick
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
526127, 526128, 526137, 526139, 526140, 526141, 526142, 526143, C08F 464
Patent
active
043010296
ABSTRACT:
A component of a polymerization catalyst is prepared by reacting an organo-magnesium compound, or a complex with an organo-aluminium compound, with a solid, inorganic oxide, then with a halogenating agent such as silicon tetrachloride or hydrogen chloride, and then reacting the product with a Lewis Base compound, particularly an ester and finally with titanium tetrachloride. The product obtained is combined with an organo-aluminium compound, preferably together with a Lewis Base, and used to polymerize an olefin monomer particularly propylene or mixtures of ethylene and a 1-olefin containing at least 4 carbon atoms. The catalyst system has a high activity, is stereospecific and has a lower proportion of halogen than some other catalyst systems.
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Caunt Anthony D.
Gavens Paul D.
Garvin Patrick
Imperial Chemical Industries Limited
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