Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-10-30
1980-02-05
Smith, Edward J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252429C, 526114, 526125, 526351, 526906, C08F 402, C08F 1006
Patent
active
041871960
ABSTRACT:
There is disclosed a process for the stereoregular polymerization of alpha-olefins or mixtures thereof with ethylene, conducted in the presence of highly active and stereospecific new catalysts. The catalysts are obtained from the reaction of a particular Al-alkyl compound which is at least in part in the form of a complex and/or a substitution reaction product with an ester of an oxygenated organic or inorganic acid, with a supported component characterized by having surface area exceeding certain values or showing a particular X-rays spectrum, and obtained by contacting a Ti halogenated compound, preferably in the form of a complex with an electron-donor compound, with a support comprising a Mg or Mn bihalide in an activated condition.
In the catalysts the ratio between the Ti compound, expressed in Ti g-atoms, and the g moles of the ester and the electron-doner compound, when present, is lower than 0.3.
REFERENCES:
patent: 3238146 (1966-03-01), Hewett et al.
patent: 3642746 (1972-02-01), Kashiwa et al.
patent: 3718636 (1973-02-01), Stevens et al.
Cassata Antonio
Giannini Umberto
Longi Paolo
Mazzocchi Romano
Montedison S.p.A.
Smith Edward J.
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