Catalyst components and catalysts for polymerizing olefins prepared from the catalysts

US4218339A · kind A · utility

Assignee

• Montedison S.p.A. · IT

Inventors

• Umberto Zucchini · Ferrara, IT
• Illaro Cuffiani · Ferrara, IT

Key dates

• Filing date: May 23, 1978
• Grant date: Aug 19, 1980
• Expiry date: May 23, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/52
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

There are disclosed catalyst components for polymerizing olefins, consisting of the product obtained by successively reacting PA1 (A) a Mg compound (halide, alcoholate, haloalcoholate, carboxylate, oxyde, hydroxyde, salt of an inorganic oxygen containing acid, Grignard reagent or reaction product of a Grignard reagent with a silicon compound), optionally in the form of a complex with an electron-donor compound, with PA1 (B) a compound having general formula [MO.sub.x (OR).sub.y ].sub.n, wherein M=Ti, V or Zr, R=an alkyl, an aryl or a cycloalkyl containing 1 to 20 carbon atoms, x may be zero, y is an integer not lower than 2, 2x+y=a valence of M, and n=an integer from 1 to 6 (inclusive), and with PA1 (C) a compound, other than the aluminium halides, exerting on component (B) a halogenating action and a reducing action, or a mixture of a halogenating compound with a reducing substance. These components, used to prepare the final catalysts by mixing them with organometallic compounds of metals belonging to Groups I, II and III of the Mendelyeev Periodic Table, provide catalysts which are particularly active in the polymerization of ethylene, alpha-olefins having at least three carbon …