EP0336545A1
Expired / Lapsed
EP
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Ziegler-Natta catalyst
Assignee: BP Chemicals Ltd
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Filing: 1989-02-23
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Granted: —
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Expires: 2009-02-23
Abstract
Abstract A catalyst of the Ziegler-Natta type is prepared using a preactivated support containing (A) from 80 to 95 mol % of magnesium chloride and (B) 5 to 20 mol % of at least one electron donor compound which contains no labile hydrogen and no ester function; the preactivated support consisting of spherical particles having a mass average diameter, Dm of 10 to 100 microns and a particle size distribution Dm/Dn of less than 2. The catalyst is prepared by (i) treating the preactivated support with at least one electron donor compound containing labile hydrogen, (ii) optionally treating the resulting activated support with at least one ester of an aromatic acid, (iii) impregnating the treated support with titanium tetrachloride and (iv) after washing the impregnated catalyst activating it with titanium tetrachloride. The catalyst has a high titanium content and a high activity when used to polymerise olefins.
Inventors
- 👤 Jean-Claude A. BP Chimie Société Anonyme Bailly
- 👤 Stylianos BP Chimie Société Anonyme Sandis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F10/00; C08F4/647; C08F4/649; C08F2410/00; C08F2410/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
Catalyst of the Ziegler-Natta type, capable of being applied to the polymerization of olefins, characterized in that it comprises a preactivated support containing from 80 to 95 mol% of magnesium chloride and from 5 to 20 mol% of at least one electron-donor compound, D₁, containing no labile hydrogen and no ester function and consisting of spherical particles which have a mass average diameter of 10 to 100 microns and a particle size distribution such that the ratio of the mass average diameter, Dm, to the number average diameter, Dn, is below 2, the preactivated support which has been successively treated with at least one electron-donor compound, D₂, containing labile hydrogen, then optionally with at least one ester of an aromatic acid, and which, when impregnated with titanium tetrachloride and then subjected to a washing with liquid hydrocarbon and to a treatment of activation with titanium tetrachloride, contains from 4 to 12% of titanium atoms per atom of magnesium.
Claim 2
Dependent Claim
158 words
Catalyst of the Ziegler-Natta type, capable of being applied to the polymerization of olefins, characterized in that it comprises a preactivated support containing from 80 to 95 mol% of magnesium chloride and from 5 to 20 mol% of at least one electron-donor compound, D₁, containing no labile hydrogen and no ester function and consisting of spherical particles which have a mass average diameter of 10 to 100 microns and a particle size distribution such that the ratio of the mass average diameter, Dm, to the number average diameter, Dn, is below 2, the preactivated support which has been successively treated with at least one electron-donor compound, D₂, containing labile hydrogen, then optionally with at least one ester of an aromatic acid, and which, when impregnated with titanium tetrachloride and then subjected to a washing with liquid hydrocarbon and to a treatment of activation with titanium tetrachloride, contains from 4 to 12% of titanium atoms per atom of magnesium.
Claim 3
Dependent Claim
21 words
Catalyst according to Claim 1, characterized in that it contains from 5 to 10% of titanium atoms per atom of magnesium.
Claim 4
Dependent Claim
152 words
Process for preparing the catalyst according to Claim 1, characterized in that it comprises the four successive stages which consist in: a) treating the preactivated support with the aid of at least one electron-donor compound containing labile hydrogen, D₂, in a quantity of between 0.2 and 1.2 moles per mole of magnesium chloride in order to obtain an activated support, b) optionally treating the said activated support with at least one ester of an aromatic acid in a quantity of between 0.1 and 1.0 mole per mole of magnesium chloride, c) impregnating the support thus treated with titanium tetrachloride in a quantity of between 1 and 25 moles per mole of magnesium chloride, then washing the impregnated support with liquid hydrocarbon, and d) subjecting the support thus impregnated and washed to a treatment of activation with titanium tetrachloride in a quantity of between 1 and 25 moles per mole of magnesium chloride.
Claim 5
Dependent Claim
22 words
Process according to Claim 3, characterized in that the electron-donor compound containing labile hydrogen, D₂, is chosen from water, alcohols and phenols.
Claim 6
Dependent Claim
53 words
Use of the catalyst according to Claim 1, in the polymerization of ethylene or of propylene, in the copolymerization of ethylene with at least one other alpha olefin containing from 3 to 8 carbon atoms, in the copolymerization of ethylene with propylene and a diene, or in the copolymerization of propylene with 1-butene.
Claim 7
Dependent Claim
80 words
Preactivated support for catalysts for the polymerisation of olefins containing from 80 to 95 mol % of magnesium chloride and from 5 to 20 mol % of an electron-donor compound, D₁, free from labile hydrogen and from ester function, and consisting of spherical particles which have a mass average diameter of 10 to 100 microns and a narrow particle size distribution, such that the ratio of the mean average diameter, Dm, to the number average diameter, Dn, is below 2.
Claim 8
Dependent Claim
80 words
Preactivated support for catalysts for the polymerisation of olefins containing from 80 to 95 mol % of magnesium chloride and from 5 to 20 mol % of an electron-donor compound, D₁, free from labile hydrogen and from ester function, and consisting of spherical particles which have a mass average diameter of 10 to 100 microns and a narrow particle size distribution, such that the ratio of the mean average diameter, Dm, to the number average diameter, Dn, is below 2.
Claim 9
Dependent Claim
21 words
Preactivated support according to Claim 6, characterised in that it has a specific surface area of 20 to 100 m²/g (BET).
Claim 10
Dependent Claim
24 words
Preactivated support according to Claim 6, characterised in that the electron-donor compound, D₁, is selected amongst ethers, sulphones, sulphoxides, thioethers, amines, amides and phosphines.
Claim 11
Dependent Claim
144 words
Process for preparing the preactivated support according to Claim 6, by reacting in a liquid hydrocarbon medium (a) a dialkyl magnesium of formula R₁MgR₂ in which R₁ and R₂ are identical or different alkyl radicals having from 2 to 12 carbon atoms, soluble in the liquid hydrocarbon medium, with (b) an alkyl chloride of formula R₃Cl in which R₃ is a secondary or tertiary alkyl radical having from 3 to 12 carbon atoms, in a molar ratio R₃Cl/R₁MgR₂ from 1.5 to 2.5, in the presence of an electron-donor compound, D₁, free from labile hydrogen and from ester function, process characterised in that the molar ratio D₁/R₁MgR₂ is from 0.1 to 1.2 and the reaction takes place by contacting R₁MgR₂, R₃Cl and D₁ over a period of at least 10 hours, with stirring in a liquid hydrocarbon medium at a temperature from 10 to 45°C.
References Cited (Backward Citations)
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