Claims
- 1. A catalyst for polymerization of .alpha.-olefins, comprising:
- a compound (b) which comprises at least one transition metal belonging to Periodic Table groups IIIb, IVb, Vb and VIb bound in, or on, a support comprising at least one .alpha.-olefin polymer which is in a form of particles of mean size from 5 to 350 .mu.m, in which a pore volume generated by pores of radius from 1,000 to 75,000 .ANG. is at least 0.2 cm.sup.3 /g and obtained by polymerizing one or more alpha olefins by means of a catalyst system (S) containing a catalytic compound (a) and an activator chosen from organoaluminium compounds, said catalytic compound (a) being obtained by heat treatment, in a presence of a halogen-containing agent, of a liquid material resulting from placing titanium tetrachloride (TiCl.sub.4), pretreated with an electron-donor compound, into contact with a compound (D) corresponding to the general formula
- AlR.sub.p (Y).sub.q X.sub.3-(p+q)
- in which
- R denotes a hydrocarbon radical;
- Y denotes a group chosen from --OR', --SR' and --NR'R" in which each of R' and R" denotes a hydrocarbon radical or a hydrogen atom;
- X denotes a halogen;
- p is any number such that 0.5<p.ltoreq.2.5;
- q is any number such that 0.5<q<3, the sum (p+q) being such that 0.5<(p+q).ltoreq.3 wherein a quantity of catalyst residue, expressed as g of compound (a) per kg of support, is at least approximately 5 g and smaller than or equal to approximately 170 g.
- 2. The catalyst according to claim 1, wherein the compound (b) is a solid based on titanium trichloride complexed with an electron-donor chosen from organic compounds containing one or more atoms or groups which have one or a number of free electron pairs.
- 3. The catalyst according to claim 2, obtained by heat treatment, in a presence of a halogen-containing agent and of support particles, of a liquid material obtained by placing TiCl.sub.4 pretreated with an electron-donor compound in contact with a composition (O) corresponding to a general formula
- AlR.sub.m (Y).sub.n X.sub.3-(m+n) (III)
- in which
- R denotes a hydrocarbon radical;
- Y denotes a group chosen from --OR', --SR' and --NR'R" in which each of R' and R" denote a hydrocarbon radical or a hydrogen atom;
- X denotes a halogen;
- n is any number such that 0<n.ltoreq.0.5;
- m is any number such that 0<m<3, the sum (m+n) being less than or equal to 3.
- 4. The catalyst according to claim 3, wherein the halogen-containing agent is TiCl.sub.4.
- 5. The catalyst according to claim 4, wherein the total quantity of TiCl.sub.4 used is such that a molar ratio of titanium to radicals R originating from the composition (O) is lower than or equal to 2.7.
- 6. A catalyst for polymerization of .alpha.-olefins, comprising:
- a compound (b) which comprises at least one transition metal belonging to the Periodic Table groups IIIb, IVb, Vb and VIb bound in, or on, a support comprising at least one .alpha.-olefin polymer which is in a form of particles of mean size from 5 to 350 .mu.m, in which a pore volume generated by pores of radius from 1,000 to 75,000 .ANG. is at least 0.2 cm.sup.3 /g and obtained by polymerizing one or more alpha olefins by means of a catalyst system (S) containing a catalytic compound (a) and an activator chosen from organoaluminium compounds, said catalytic compound (a) being obtained by heat treatment, in a presence of a halogen-containing agent, of a liquid material resulting from placing titanium tetrachloride (TiCl.sub.4), pretreated with an electron-donor compound, into contact with a compound (D) corresponding to the general formula
- AlR.sub.p (Y).sub.q X.sub.3-(p+q)
- in which
- R denotes a hydrocarbon radical;
- Y denotes a group chosen from --OR', --SR' and --NR'R" in which each of R' and R" denotes hydrocarbon radical or a hydrogen atom;
- X denotes a halogen;
- p is any number such that 0<p.ltoreq.2.5;
- q is any number such that 0.5<q<3, the sum (p+q) being such that 0.5<(p+q)<3 wherein a quantity of catalyst residue, expressed as g of compound (a) per kg of support, is at least from approximately 2 g to approximately 170 g of compound (a) per kg.
- 7. In a method of polymerizing an .alpha.-olefin, the improvement, comprising: utilizing a catalyst system containing the catalyst of claim 1, an activator chosen from an organoaluminium compound containing at least on aluminum-carbon bond and, optionally, one third constituent known to improve their stereospecificity and/or their activity.
- 8. In a method of polymerizing an .alpha.-olefin, the improvement, comprising:
- utilizing a catalyst system containing the catalyst of claim 2, an activator chosen from an organoaluminium compound containing at least one alumium-carbon bond and, optionally, on third constituent known to improve their stereospecificity and/or their activity.
- 9. In a method of polymerizing an .alpha.-olefin, the improvement, comprising:
- utilizing a catalyst system containing the catalyst of claim 3, an activator chosen from an organoaluminium compound containing at least one aluminum-carbon bond and, optionally, one third constituent known to improve their stereospecificity and/or their activity.
Priority Claims (1)
Number |
Date |
Country |
Kind |
09300539 |
May 1993 |
BEX |
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Parent Case Info
This is a Division of application Ser. No. 08/248,218 filed May 24, 1994, now U.S. Pat. No. 5,556,893.
US Referenced Citations (14)
Foreign Referenced Citations (10)
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Date |
Country |
0168317 |
Jan 1986 |
EPX |
168317 |
Jan 1986 |
EPX |
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EPX |
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EPX |
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FRX |
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Non-Patent Literature Citations (4)
Entry |
Periodic Table of the Elements; version published in the Handbook of Chemistry and Physics, 50th Edition, p. B-3, 1969-1970. |
The Different Crystalline Modifications of TiCl.sub.3, a Catalyst Component for the Polymerization of .alpha.-Olefins. Journal of Polymer Science, vol. 51, pp. 399-410, 1961. |
Communications to the Editor; vol. 6,No. 6, Nov.-Dec. 1973, pp. 925 and 926. |
Derwent Publications Ltd., English abstract of EP-A-0168317 to ATOCHEM. |
Divisions (1)
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Number |
Date |
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Parent |
248218 |
May 1994 |
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