Claims
- 1. A procatalyst composition which is suitable for the homo- and copolymerization of alpha olefins together with an organometallic cocatalyst compound, said composition prepared in the absence of any chlorine containing transition metal compound by forming on an inorganic carrier a component system of a complex of a magnesium halide, a tetraalkyl titanate, and a chlorinating compound containing no transition metal, said composition further containing an additional amount of magnesium added as an organomagnesium compound such that the magnesium/titanium molar ratio is raised over 1, said organomagnesium compound being added after said chlorinating compound.
- 2. A composition according to claim 1, characterized in that the organomagnesium compound is one or more compounds of the formula RMgR', wherein R is a hydrocarbon group containing 1 to 20 carbons and R' is a hydrocarbon group containing 1 to 20 carbons or halogen, or a complex thereof with an aluminium, boron, beryllium or zinc compound.
- 3. A composition according to claim 2, characterized in that the organomagnesium compound has been selected from the group consisting of n-butyl ethyl magnesium, butyl octyl magnesium, butyl octyl magnesium ethoxide and ethyl magnesium chloride.
- 4. A composition according to claim 1, characterized in that in said component system the organomagnesium compound has been added as the last stage or at least after the chlorinating compound.
- 5. A composition according to claim 1, characterized in that the tetraalkyl titanate is ethyl titanate, Ti(OEt).sub.4, propyl titanate, (Ti(OPr).sub.4, or most preferably butyl titanate, Ti(OBu).sub.4.
- 6. A composition according to claim 1, characterized in that the magnesium halide is magnesium chloride.
- 7. A composition according to claim 1, characterized in that the chlorinating compound containing no transition metal is HCl, CCl.sub.4, BCl.sub.3, SiCl.sub.4 or a compound of the formula [R.sub.n AlCl.sub.3-n ].sub.m wherein R is a hydrocarbon group containing 1 to 20 carbon atoms, preferably a lower alkyl group, n is 1 or 2 and m is 1 or 2.
- 8. A composition according to claim 7, characterized in that the chlorinating compound containing no transition metal is diethyl aluminium chloride, ethyl aluminium dichloride or ethyl aluminium sesquichloride.
- 9. A method for preparing a procatalyst composition which is suitable for the homo- and copolymerization of alpha olefins together with an organometallic cocatalyst compound, comprising adding in the absence of any chlorine containing transition metal compound onto an inorganic carrier a component system of a complex of a magnesium halide, a tetraalkyl titanate, and a chlorinating compound containing no transition metal, and said method further comprising adding an additional amount of magnesium as an organomagnesium compound after said chlorinating compound such that the magnesium/titanium molar ratio is raised over 1.
- 10. A method according to claim 9, characterized in that the organomagnesium compound is one or more compounds of the formula RMgR', wherein R is a hydrocarbon group containing 1 to 20 carbons and R' is a hydrocarbon group containing 1 to 20 carbons or halogen, or a complex thereof with an aluminium, boron, beryllium or zinc compound.
- 11. A method according to claim 10, characterized in that the organomagnesium compound has been selected from the group consisting of n-butyl ethyl magnesium, butyl octyl magnesium, butyl octyl magnesium ethoxide and ethyl magnesium chloride.
- 12. A method according to claim 9, characterized in that in said component system the organomagnesium compound is added as the last stage or at least after the chlorinating compound.
- 13. A method according to claim 9, characterized in that the tetraalkyl titanate is ethyl titanate, Ti(OEt).sub.4, propyl titanate, (Ti(OPr).sub.4, or most preferably butyl titanate, Ti(OBu).sub.4.
- 14. A method according to claim 9, characterized in that the magnesium halide is magnesium chloride.
- 15. A method according to claim 9, characterized in that the chlorinating compound containing no transition metal is HCl, CCl.sub.4, BCl.sub.3, SiCl.sub.4 or a compound of the formula [R.sub.n AlCl.sub.3-n ].sub.m wherein R is a hydrocarbon group containing 1 to 20 carbon atoms, preferably a lower alkyl group, n is 1 or 2 and m is 1 or 2.
- 16. A method according to claim 15, characterized in that the chlorinating compound containing no transition metal is diethyl aluminium chloride, ethyl aluminium dichloride or ethyl aluminium sesquichloride.
- 17. In a method for preparing a procatalyst composition for homo- or copolymerizing alpha-olefins comprising adding onto an inorganic carrier a chlorinating compound containing no transitional metal and a solution of a magnesium halide in a tretraalkyl titanate, the improvement which comprises adding, without a washing or drying step, an additional amount of an organomagnesium compound in order to achieve a procatalyst composition after drying in which the magnesium/titanium molar ratio is raised over 1.
Priority Claims (1)
Number |
Date |
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Kind |
0/916192 |
Dec 1991 |
FIX |
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Parent Case Info
This is a continuation of application Ser. No. 08/094,172 filed on Jul. 27, 1993, now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (9)
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FIX |
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Jun 1991 |
FIX |
914216 |
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FIX |
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Jun 1991 |
WOX |
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WOX |
Non-Patent Literature Citations (1)
Entry |
Japan Abstract No. JP 1024814, Jan. 26, 1989, "Ethylene Copolymer preparation--without supply of hydrogen in inert solvent in presence of catalyst obtained from magnesium, titanium and organoaluminum compounds" Idemitsu Petrochem KK. |
Continuations (1)
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Number |
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Parent |
94172 |
Jul 1993 |
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