EP0416928A2
Expired / Lapsed
EP
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New carrier catalyst for the polymerization of ethylene
Assignee: Borealis Holding AS
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Filing: 1990-09-06
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Granted: —
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Expires: 2010-09-06
Abstract
Abstract The invention provides an olefin polymerization catalyst system of which the procatalyst comprises a solid carrier with a magnesium compound, an electron donor compound and monocyclopentadienyl titanium trichloride on its surface. A method for the preparation of such a procatalyst is also disclosed, comprising impregnating a solid carrier with a solution obtainable by dissolving a magnesium compound and monocyclopentadienyl titanium trichloride in a compound having electron donor properties. The use of the olefin polymerisation catalyst system in a process for polymerizing olefins is also disclosed.
Inventors
- 👤 Sirpa Ala-Huikku
- 👤 Ulf Palmqvist
- 👤 Marjaana Lommi
- 👤 Eero Iiskola
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 00:25
CPC Classifications
C; C08; C08F; C08F10/00; C08F110/00; C08F110/02; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/65916; C08F4/6592; Y; Y10; Y10S; Y10S526/00; Y10S526/941
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
40 words
An olefin polymerization catalyst system, the procatalyst of which comprises a solid carrier and on its surface a layer comprising a titanium compound, a magnesium compound and an electron donor, characterized in that the titanium compound is monocyclopentadienyl titanium trichloride.
Claim 2
Dependent Claim
40 words
An olefin polymerization catalyst system, the procatalyst of which comprises a solid carrier and on its surface a layer comprising a titanium compound, a magnesium compound and an electron donor, characterized in that the titanium compound is monocyclopentadienyl titanium trichloride.
Claim 3
Dependent Claim
21 words
An olefin polymerization catalyst system according to Claim 1, wherein the solid carrier comprises silicon dioxide, aluminium oxide or magnesium silicate.
Claim 4
Dependent Claim
27 words
An olefin polymerization catalyst system according to Claim 1 or 2, characterized in that the procatalyst comprises, as the magnesium compound, a magnesium halide, preferably magnesium chloride.
Claim 5
Dependent Claim
40 words
An olefin polymerization catalyst system according to any one of the preceding Claims, characterized in that the procatalyst comprises, as the electron donor, an alkyl ester of a carboxylic acid, an aliphatic ester, a cyclic ether or an aliphatic ketone.
Claim 6
Dependent Claim
40 words
An olefin polymerization catalyst system according to any one of the preceding claims, characterized in that the molar ratios of the procatalyst are as follows: Ti:Mg = 0.1:1.0; Cl:Mg = 2.5:6 and the electron donor (calculated as tetrahydrofurane):Mg = 0.5:4.5.
Claim 7
Dependent Claim
46 words
An olefin polymerization catalyst system according to any one of the preceding Claims, characterized in that it comprises a cocatalyst based on an organometallic compound of a metal belonging to any of the groups IA to IIIA of the periodic table of elements, preferably on trialkylaluminium.
Claim 8
Independent Claim
44 words
A method for the preparation of a solid procatalyst of an olefin polymerization catalyst system, characterized by impregnating a solid carrier with a solution obtainable by dissolving a magnesium compound and monocyclopentadienyl titanium trichloride in a compound having the properties of an electron donor.
Claim 9
Independent Claim
44 words
A method for the preparation of a solid procatalyst of an olefin polymerization catalyst system, characterized by impregnating a solid carrier with a solution obtainable by dissolving a magnesium compound and monocyclopentadienyl titanium trichloride in a compound having the properties of an electron donor.
Claim 10
Dependent Claim
49 words
A method according to Claim 7, characterized by first treating the solid carrier by heating it to a temperature of from 200 to 1000°C and/or by treating it chemically with aluminium alkyl or a derivative thereof, a zinc alkyl, an organosilicon compound, a phosphorus compound or a fluorine compound.
Claim 11
Dependent Claim
27 words
A method according to Claim 8, characterized by treating the solid carrier chemically by suspending it in a hydrocarbon and adding to the suspension a pretreatment chemical.
Claim 12
Dependent Claim
27 words
A method according to any one of Claims 7 to 9, characterized in that the procatalyst is as defined in any one of claim 1 to 5.
Claim 13
Dependent Claim
56 words
A process for polymerizing olefins characterized in that the polymerization is carried out in the presence of a polymerization catalyst system as claimed in any of claims 1 to 5 which further comprises, as cocatalyst, an organometallic compound of a metal belonging to any of the groups IA to IIIA of the periodic table of elements.
Claim 14
Dependent Claim
46 words
A process according to Claim 11, which further comprises, in addition to the normal activation of the procatalyst which takes place on the cocatalyst, preactivating the procatalyst in a separate stage with a cocatalyst of either the same type or of different type prior to polymerization.
References Cited (Backward Citations)
No citation records indexed.
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