EP0447070A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Catalyst and prepolymer used for polymerising olefins, and (co)polymer of ethylene obtainable therefrom
Assignee: BP Chemicals SNC
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Filing: 1991-02-28
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Granted: —
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Expires: 2011-02-28
Abstract
Abstract The present invention relates to a solid catalyst suitable for polymerising olefins in a heterogeneous process, the catalyst being obtainable by a process comprising in a first stage contacting an electron-donor D2 containing labile hydrogen, e.g. alcohol, with a spheroidal MgCl₂ support containing an electron-donor D1 free from labile hydrogen, e.g. ether, and in a second stage contacting the resulting support with a zirconium metallocene, at least one titanium or vanadium halide and optionally with an organoaluminium compound, preferably an aluminoxane. The solid catalyst may be used as such or in the form of a prepolymer in a polymerisation of olefins, the prepolymer being obtained by contacting the solid catalyst with ethylene or a mixture of ethylene with C3 to C8 alpha-olefin in the presence of an organo-aluminium compound, preferably an aluminoxane. The solid catalysts and the prepolymer consist of spheroidal particles preferably having a narrow particle size distribution.
Inventors
- 👤 Jean-Claude André BP Chemicals S.N.C. Bailly
- 👤 Christine Jacqueline Bp Chemicals S.N.C Chabrand
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:54
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/42; C08F4/72; C08F4/74; C08F4/76; C08F10/00; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65904; C08F4/65912; C08F4/65916; C08F4/6592; C08F4/65922
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
185 words
Solid catalyst suitable for a heterogeneous process for polymerising one or more olefins, the solid catalyst being prepared by contacting a zirconium metallocene with a magnesium chloride support, characterised in that the solid catalyst is obtainable by a process comprising: (i) a first stage, wherein a solid support (A) containing from 80 to 99.5 mol % of magnesium dichloride and from 0.5 to 20 mol % of at least one organic electron-donor compound, D1, free for labile hydrogen, the solid support (A) being in the form of spheroidal particles with a mass-mean diameter, Dm, of 10 to 100 microns and a particle size distribution such that the ratio of Dm to the number-average diameter, Dn, of the particles is not higher than 3, is brought into contact with at least one electron-donor compound, D2, containing labile hydrogen, to form a support (A'), (ii) a second stage, wherein the support (A') is brought into contact with a zirconium metallocene (B) and at least one halide (C) of a transition metal (MT) chosen from titanium and vanadium, and optionally with an organoaluminium compound (E) preferably an aluminoxane.
Claim 2
Dependent Claim
34 words
Solid catalyst according to Claim 1, characterised in that the organic electron-donor compound, D1, free from labile hydrogen is chosen from ethers, esters, thioethers, sulphones, sulphoxides, secondary amides, tertiary amines, tertiary phosphines and phosphoramides.
Claim 3
Dependent Claim
34 words
Solid catalyst according to Claim 1, characterised in that the electron-donor compound, D2, containing labile hydrogen is chosen from alcohols, phenols, primary amides, primary or secondary amines, primary or secondary phosphines, and carboxylic acids.
Claim 4
Dependent Claim
146 words
Process for preparing the solid catalyst according to Claim 1, characterised in that: (i) in the first stage, the compound D2 is used in an amount such that the molar ratio of the quantity of D2 to that of magnesium of the support is from 0.05 to 2.5, and (ii) in the second stage, the amounts of the compounds used are such that the atomic ratio of the quantity of Zr of the zirconium metallocene (B) to that of Mg of the support is from 0.001 to 1, the atomic ratio of the quantity of Ti and/or V of the halide (C) to that of Mg of the support is from 0.01 to 10, and the atomic ratio of the quantity of Al of the compound (E) to that of Zr of the zirconium metallocene (B) is from 0 to 1,000, preferably from 1 to 500.
Claim 5
Dependent Claim
102 words
Prepolymer particles characterised in that they comprise (i) a polyethylene or a copolymer of ethylene with up to 10% by weight of at least one C3 to C8 alpha-olefin and (ii) an active catalyst for a (co-)polymerisation of olefins essentially containing atoms of magnesium, chlorine, aluminium, zirconium, titanium and/or vanadium, and comprising an organoaluminium compound as cocatalyst and the solid catalyst according to Claim 1, in quantity such that the prepolymer contains from 0.1 to 500 g of polyethylene or copolymer of ethylene per millimole of Zr and transition metal (TM), and the atomic ratio of Al/(Zr+TM) is from 10 to 1,000.
Claim 6
Dependent Claim
49 words
Prepolymer particles according to Claim 5, characterised in that they consist of spheroidal particles having a mass-average diameter of Dm from 10 to 500 microns and a particle size distribution such that the ratio of Dm to the number-average diameter Dn of the particles is not higher than 3.
Claim 7
Dependent Claim
85 words
Process for preparing the prepolymer particles according to Claim 5, characterised in that the solid catalyst according to Claim 1 is contacted with ethylene or a mixture of ethylene and at least one C3 to C8 alpha-olefin in a liquid hydrocarbon or in a gas phase, at a temperature from 0 to 100°C, under a total pressure from 0.1 to 5 MPa, in the presence of an organoaluminium compound in a quantity such that the atomic ratio of Al/(Zr+TM) is from from 10 to 1,000.
Claim 8
Dependent Claim
88 words
Process for polymerising ethylene or copolymerising ethylene with at least one C3 to C8 alpha-olefin, charactereised in that the solid catalyst according to Claim 1 or the prepolymer particles according to Claim 5 are contacted with ethylene or a mixture of ethylene with at least one C3 to C8 alpha-olefin, at a temperature of 10 to 110°C, under a total pressure of 0.1 to 5 MPa, in the presence of an organoaluminium compound, in a quantity such that the atomic ratio of Al/(Zr+TM) is from 10 to 1,000.
References Cited (Backward Citations)
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