Catalyst components for the polmerization of olefins
First Claim
1. In a catalyst component for the polymerization of olefins CH2═
- CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Mg, Ti, and halogen, the improvement comprising;
in the catalyst component, the presence of at least two internal electron donor compounds, a first internal electron donor compound selected from the group consisting of ethers containing two or more ether groups, wherein said ethers are further characterized by the formation of complexes with anhydrous magnesium dichloride in an amount less than 60 mmoles per 100 g of MgCl2 and by the failure of entering into substitution reactions with TiCl4 or by reacting in that way for less than 50% by moles, and a second internal electron donor compound selected from the group consisting of esters of mono and polycarboxylic acids.
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Abstract
The present invention relates to catalyst components for the polymerization of olefins having Mg, Ti, halogen and at least two internal electron donor compounds, said catalyst components characterized by the fact that at least one of the electron donor compounds is selected from ethers containing two or more ether groups which are further characterized by the formation of complexes with anhydrous magnesium dichloride in an amount less than 60 mmoles per 100 g of MgCl2 and by the failure of entering into substitution reactions with TiCl4 or by reacting in that way for less than 50% by moles, and at least another electron donor compound selected from esters of mono or polycarboxylic acids. Said catalyst components are able to produce propylene polymers which, for high values of xylene insolubility, show a broad range of isotacticity.
85 Citations
26 Claims
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1. In a catalyst component for the polymerization of olefins CH2═
- CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Mg, Ti, and halogen, the improvement comprising;
in the catalyst component, the presence of at least two internal electron donor compounds, a first internal electron donor compound selected from the group consisting of ethers containing two or more ether groups, wherein said ethers are further characterized by the formation of complexes with anhydrous magnesium dichloride in an amount less than 60 mmoles per 100 g of MgCl2 and by the failure of entering into substitution reactions with TiCl4 or by reacting in that way for less than 50% by moles, and a second internal electron donor compound selected from the group consisting of esters of mono and polycarboxylic acids. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
where RI and RII are the same or different and are hydrogen or linear or branched C1-C18 hydrocarbon groups which can also form one or more cyclic structures; - RIII groups, equal or different from each other, are hydrogen or C1-C18 hydrocarbon groups;
RIV groups, equal or different from each other, have the same meaning of RIII except that they cannot be hydrogen;
each of RI to RIV groups can contain heteroatoms selected from the group consisting of halogens, N, O, S and Si.
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4. A catalyst component according to claim 3 in which the 1,3-diethers are of formula (II)
where the radicals RIV have the same meaning explained in claim 3 above, and the radicals RIII and RV radicals, equal or different, are selected from the group consisting of hydrogen, halogens, C1-C20 alkyl radicals, linear or branched; - C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl and C7-C20 aralkyl radicals, and two or more of the RV radicals can be bonded to each other to form condensed cyclic structures, saturated or unsaturated, optionally substituted with RVI radicals selected from the group consisting of halogens, C1-C20 alkyl radicals, linear or branched;
C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl and C7-C20 aralkyl radicals;
said radicals RV and RVI optionally containing one or more heteroatoms as substitutes for carbon or hydrogen atoms, or both.
- C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl and C7-C20 aralkyl radicals, and two or more of the RV radicals can be bonded to each other to form condensed cyclic structures, saturated or unsaturated, optionally substituted with RVI radicals selected from the group consisting of halogens, C1-C20 alkyl radicals, linear or branched;
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5. A catalyst component according to claim 3 in which the RIII radicals are hydrogen, and all the RIV radicals are methyl.
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6. A catalyst component according to claim 4 in which two or more of the RV radicals are bonded to each other to form one or more condensed cyclic structures.
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7. A catalyst component according to claim 6 in which the 1,3-diethers are selected from the compounds of formula (III):
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where the RVI radicals, equal or different, are hydrogen;
halogens;
C1-C20 alkyl radicals, linear or branched;
C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 aralkyl radicals, optionally containing one or more heteroatoms selected from the group consisting of N, O, S, P, Si and halogens, as substitutes for carbon or hydrogen atoms, or both, and the radicals RIII and RIV are as defined in claim 4 above for formula (II).
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8. A catalyst component according to claim 1 in which the second internal electron donor compound is an ester of aliphatic dicarboxylic acids.
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9. A catalyst component according to claim 8 in which the second internal electron donor is an ester of malonic acids of formula (IV):
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where R1 is H or a C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group, R2 is a C1-C20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group, R3 and R4, equal to or different from each other, are C1-C20 linear or branched alkyl groups or C3-C20 cycloalkyl groups.
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10. A catalyst component according to claim 1 in which the second internal electron donor compound is an ester of an aromatic carboxylic acid.
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11. A catalyst component according to claim 10 in which the ester of the aromatic carboxylic acid is C1-C20 alkyl or aryl esters of benzoic or phthalic acid, optionally substituted.
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12. A catalyst component according to claim 1 in which the second internal electron donor compound is a C1-C6 linear or branched alkyl ester.
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13. A catalyst component according to claim 1 in which the molar ratio between the first internal electron donor compound and the second internal electron donor compound is in the range of from 0.02 to 50.
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14. A catalyst component according to claim 1 in which the molar ratio between the first internal electron donor compound and the second internal electron donor compound is from 0.1 to 30.
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15. A catalyst component according to claim 14 comprising a titanium compound having at least a Ti-halogen bond and the at least two internal electron donor compounds supported on a Mg halide in active form.
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16. A catalyst component according to claim 15 in which the titanium compound is TiCl4 or TiCl3.
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17. A catalyst component according to claim 1 having a spherical form, a surface area (by B.E.T. method) between 20 and 500 m2/g, and a total porosity (by B.E.T. method) higher than 0.2 cm3/g.
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18. A catalyst for the polymerization of olefins CH2═
- CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising the product of the reaction between;
(i) the catalyst component according to claim 1 and (ii) an alkylaluminum compound.
- CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising the product of the reaction between;
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19. A catalyst according to claim 18 further comprising an external electron donor compound.
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20. A catalyst according to claim 19 in which the external electron donor compound is selected from the group consisting of ethers, esters, amines, heterocyclic compounds, 2,2,6,6-tetramethyl piperidine, ketones and 1,3-diethers of the general formula (V):
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wherein RI, RII, RIII, RIV, RV and RVI, equal to or different from each other, are hydrogen or hydrocarbon radicals having from 1 to 18 carbon atoms, and RVII and RVIII, equal to or different from each other, have the same meaning of RI-RVI except that they cannot be hydrogen, wherein one or more of the RI-RVIII groups can be linked to form a cycle.
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21. A catalyst according to claim 19 in which the external electron donor compound is selected from silicon compounds of formula Ra5Rb6Si(OR7)c, where a and b are integers from 0 to 2, c is an integer from 1 to 4 and the sum (a+b+c) is 4;
- R5, R6 and R7 are alkyl, cycloalkyl or aryl radicals with 1-18 carbon atoms optionally containing heteroatoms.
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22. A catalyst according to claim 21 in which a is 1, b is 1, and c is 2.
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23. Catalyst according to claim 22 in which R5 or R6, or both, are branched alkyl, cycloalkyl or aryl groups with 3-10 carbon atoms optionally containing heteroatoms, and R7 is a C1-C10 alkyl group.
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24. A catalyst according to claim 21 in which a is 0, c is 3, R6 is a branched alkyl or cycloalkyl group, and R7 is methyl.
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25. A catalyst according to claim 22 in which the silicon compound is selected from the group consisting of methylcyclohexyldimethoxysilane, diphenyldimethoxysilane, methyl-t-butyldimethoxysilane, dicyclopentyldimethoxysilane, (2-ethylpiperidinyl)t-butyldimethoxysilane, (2-ethylpiperidinyl)hexyldimethoxysilane, (3,3,3-trifluoro-n-propyl)(2-ethylpiperidinyl)dimethoxysilane, and methyl(3,3,3-trifluoro-n-propyl)dimethoxysilane.
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26. Process for the (co)polymerization of olefins CH2═
- CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, carried out in the presence of a catalyst comprising the product of the reaction between;
(i) the solid catalyst component according to claim 1;
(ii) an alkylaluminum compound and, (iii) optionally an external donor compound.
- CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, carried out in the presence of a catalyst comprising the product of the reaction between;
- CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Mg, Ti, and halogen, the improvement comprising;
Specification