CATALYST FOR (CO)POLYMERIZATION OF OLEFINS, METHOD FOR ITS PRODUCTION AND METHOD FOR (CO)POLYMERIZATION OF OLEFINS

Abstract

A catalyst for the (co)polymerization of olefins is proposed, containing a metallocene precatalyst Zr1 (1), an aluminum-containing activator and a support, in which the molar ratio [Al] / [Zr] in the supported catalyst is from 20 to 50. A method for producing said catalyst and a method for the (co)polymerization of olefins using it are also proposed.

Claims

1. A catalyst for the (co)polymerization of olefins, containing a metallocene precatalyst Zr1 (1), an aluminum-containing activator and a support, characterized in that it is obtained by: (a) reacting trimethylaluminum with benzoic acid in an organic solvent to obtain a solution of an aluminum-containing activator; (b) treating the resulting solution of an aluminum-containing activator with calcined mesoporous silica gel to form an activated support and (c) applying the metallocene precatalyst Zr1 to the activated support, and with a molar ratio of [Al] / [Zr], where [Al] and [Zr] are the molar contents of Al and Zr in the supported catalyst, amounting to from 25 to 40 2. The catalyst according to claim 1, wherein the molar ratio [Al] / [Zr] in the supported catalyst is from 26 to 35.

3. The catalyst according to claim 1, in which the solvent is distilled from the solution of aluminum-containing activator obtained in step (a) to a residual volume of 20 to 90% of the initial volume, preferably 20 to 80%, more preferably 20 to 70%, even more preferably 30 to 50%, in particular about 30%, 50%, 60% or 90% of the initial volume, before treating the calcined mesoporous silica gel with the solution of aluminum-containing activator.

4. The catalyst according to item 3, in which the distillation of the solvent is carried out by evaporating a solution of the aluminum-containing activator at a temperature of 30 to 50°C under reduced pressure.

5. The catalyst according to any one of claims 1 to 4, wherein in step (a) the molar ratio of trimethylaluminium to benzoic acid is from 2.5 to 3.3, preferably from 2.6 to 3.1, more preferably from 2.65 to 3.

0.

6. A catalyst according to any one of claims 1 to 5, wherein the organic solvent is toluene.

7. A catalyst according to any one of claims 1 to 6, prepared using mesoporous silica gel containing from 1 to 2 wt.%, preferably from 1.2 to 1.8 wt.%, more preferably from 1.4 to 1.6 wt.%, even more preferably about 1.5 wt.% of aluminum oxide.

8. The catalyst according to any one of claims 1 to 7, prepared using pre-calcined mesoporous silica gel, which has a surface area (BET) from 220 to 350 m2 / g, preferably from 260 to 280 m2 / g, an average pore diameter (BET) from 180 to 280 Å, preferably from 220 to 240 Å and a silanol group content from 0.85 to 1.85 mmol / g, preferably from 0.9 to 1.1 mmol / g.

9. A method for producing a catalyst for the (co)polymerization of olefins according to any one of paragraphs 1-8, comprising sequentially: (a) the reaction of trimethylaluminum with benzoic acid in an organic solvent to obtain a solution of an aluminum-containing activator; (b) treating the calcined mesoporous silica gel with the resulting solution of an aluminum-containing activator to form an activated carrier and (c) applying a metallocene precatalyst Zr1 (1) onto an activated support with a molar ratio of [Al] / [Zr], where [Al] and [Zr] are the molar contents of Al and Zr in the applied catalyst, ranging from 25 to 40 10. The method according to claim 9, further comprising the step of distilling off the solvent from the solution of the aluminum-containing activator obtained in step (a) to a residual volume of from 20 to 90% of the original, preferably from 20 to 80%, more preferably from 20 to 70%, even more preferably from 30 to 50%, in particular about 30%, 50%, 60% or 90% of the original, before treating the calcined mesoporous silica gel with the solution of the aluminum-containing activator.

11. The method according to claim 10, in which the distillation of the solvent is carried out by evaporating the activator solution at a temperature of 30 to 50°C and under reduced pressure.

12. The method according to any one of claims 9 to 11, wherein in step (a) the molar ratio of trimethylaluminium to benzoic acid is from 2.5 to 3.3, preferably from 2.6 to 3.1, more preferably from 2.65 to 3.

0.

13. The method according to any one of claims 9 to 12, wherein the organic solvent is toluene.

14. The method according to any one of claims 9 to 13, wherein the mesoporous silica gel contains from 1 to 2 wt.%, preferably from 1.2 to 1.8 wt.%, more preferably from 1.4 to 1.6 wt.%, even more preferably about 1.5 wt.% of aluminum oxide.

15. The method according to any one of claims 9 to 14, wherein the pre-calcined mesoporous silica gel has a surface area (BET) of 220 to 350 m2 / g, preferably 260 to 280 m2 / g, an average pore diameter (BET) of 180 to 280 Å, preferably 220 to 240 Å, and a silanol group content of 0.85 to 1.85 mmol / g, preferably 0.9 to 1.1 mmol / g.

16. A method for (co)polymerizing olefins, comprising bringing at least one olefin into contact with a catalyst according to any one of claims 1 to 8.

17. The method of claim 16, wherein the olefin is at least one selected from the group consisting of ethylene and hexene-1.

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