WO2007147714A1 - Magnesium chloroalkolate-based catalyst precursors - Google Patents
Magnesium chloroalkolate-based catalyst precursors Download PDFInfo
- Publication number
- WO2007147714A1 WO2007147714A1 PCT/EP2007/055386 EP2007055386W WO2007147714A1 WO 2007147714 A1 WO2007147714 A1 WO 2007147714A1 EP 2007055386 W EP2007055386 W EP 2007055386W WO 2007147714 A1 WO2007147714 A1 WO 2007147714A1
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- WO
- WIPO (PCT)
- Prior art keywords
- catalyst
- bis
- compounds
- catalyst precursors
- formula
- Prior art date
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- 239000012018 catalyst precursor Substances 0.000 title claims abstract description 32
- 239000011777 magnesium Substances 0.000 title description 32
- 229910052749 magnesium Inorganic materials 0.000 title description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 4
- 239000003054 catalyst Substances 0.000 claims abstract description 64
- 150000001875 compounds Chemical class 0.000 claims abstract description 36
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 31
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 230000002140 halogenating effect Effects 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 23
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 17
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- 150000001336 alkenes Chemical class 0.000 claims description 9
- 150000003609 titanium compounds Chemical class 0.000 claims description 9
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 8
- 239000002879 Lewis base Substances 0.000 claims description 7
- 150000007527 lewis bases Chemical class 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 4
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 229910052723 transition metal Inorganic materials 0.000 claims description 2
- 150000003624 transition metals Chemical class 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract description 38
- 239000005977 Ethylene Substances 0.000 abstract description 38
- 239000002243 precursor Substances 0.000 abstract description 22
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 abstract description 22
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 abstract description 22
- 150000002430 hydrocarbons Chemical group 0.000 abstract description 18
- 238000006243 chemical reaction Methods 0.000 abstract description 16
- 239000004711 α-olefin Substances 0.000 abstract description 12
- 230000037048 polymerization activity Effects 0.000 abstract description 4
- 230000004913 activation Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 46
- 239000002245 particle Substances 0.000 description 41
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 40
- 238000003756 stirring Methods 0.000 description 28
- 239000007787 solid Substances 0.000 description 26
- 229910003074 TiCl4 Inorganic materials 0.000 description 25
- 239000000460 chlorine Substances 0.000 description 25
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 25
- -1 magnesium halides Chemical class 0.000 description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
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- 229910052757 nitrogen Inorganic materials 0.000 description 12
- 239000011949 solid catalyst Substances 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 11
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 11
- 150000003254 radicals Chemical class 0.000 description 11
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 10
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- 125000004432 carbon atom Chemical group C* 0.000 description 9
- 150000003377 silicon compounds Chemical class 0.000 description 9
- 150000002681 magnesium compounds Chemical class 0.000 description 8
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 7
- 150000002148 esters Chemical class 0.000 description 7
- 229910052736 halogen Inorganic materials 0.000 description 7
- 150000002367 halogens Chemical class 0.000 description 7
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- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
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- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 125000000753 cycloalkyl group Chemical group 0.000 description 5
- 150000002170 ethers Chemical class 0.000 description 5
- 125000005842 heteroatom Chemical group 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
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- 150000002431 hydrogen Chemical group 0.000 description 4
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 4
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- 125000004122 cyclic group Chemical group 0.000 description 3
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920005606 polypropylene copolymer Polymers 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- 230000000707 stereoselective effect Effects 0.000 description 3
- MCULRUJILOGHCJ-UHFFFAOYSA-N triisobutylaluminium Chemical compound CC(C)C[Al](CC(C)C)CC(C)C MCULRUJILOGHCJ-UHFFFAOYSA-N 0.000 description 3
- 125000006736 (C6-C20) aryl group Chemical group 0.000 description 2
- 125000004066 1-hydroxyethyl group Chemical group [H]OC([H])([*])C([H])([H])[H] 0.000 description 2
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Chemical compound CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
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- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
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- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 150000002902 organometallic compounds Chemical class 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
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- 125000001637 1-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C(*)=C([H])C([H])=C([H])C2=C1[H] 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/65—Pretreating the metal or compound covered by group C08F4/64 before the final contacting with the metal or compound covered by group C08F4/44
- C08F4/652—Pretreating with metals or metal-containing compounds
- C08F4/654—Pretreating with metals or metal-containing compounds with magnesium or compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/28—Titanium compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/65—Pretreating the metal or compound covered by group C08F4/64 before the final contacting with the metal or compound covered by group C08F4/44
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/02—Ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/04—Monomers containing three or four carbon atoms
- C08F110/06—Propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
Definitions
- the present invention relates to catalyst precursors comprising compounds including at least a magnesium compound and a titanium compound in specific molar ratios.
- the catalyst precursors of the present invention are particularly useful in the preparation of Ziegler-Natta catalyst components for the polymerization of olefins.
- the modern Ziegler-Natta catalysts including titanium compounds supported on magnesium halides are well known in the art. Catalysts of this type are described in the U.S. patent 4,298,718. Said catalysts comprise titanium tetrahalides supported on halides of magnesium. Although the catalysts have high activity in the polymerization of alpha olefins like propylene, they are not very stereospecific. Improvements to stereospecificity have been made by adding electron-donor compounds to the solid catalyst component.
- the catalysts modified in this manner although being highly stereospecific (the propylene polymer is about 94-95% insoluble in xylene at room temperature) still did not show sufficiently high levels of activity.
- Said catalysts comprise as solid catalysts component, a magnesium halide on which is supported a titanium halide, preferably TiCl 4 , and an electron- donor compound, selected from specific classes of carboxylic acid esters, and, as co-catalyst component, a system formed of an Al-trialkyl compound and a silicon compound containing at least one Si-OR bond (R hydrocarbon radical).
- the European Patent 0361494 and EP 728769 describe very active solid catalyst components for the polymerization of olefins comprising, as an internal electron-donor compound, a 1,3-diether characterized by a specific structure and/or by specific reactivity characteristics toward the anhydrous magnesium chloride and TiCl 4 .
- the catalysts obtained from the reaction of said catalyst components with an Al-alkyl compound exhibit a so high activity and stereospecificity in the polymerization of olefins, that the use of an external electron-donor can be avoided.
- the catalyst activity is particularly high when the catalyst is obtained starting from precursors comprising adducts of formula MgCl 2 (ROH) n where R is a Cl-ClO alkyl group, preferably ethyl, and n is from 2 to 6.
- R is a Cl-ClO alkyl group, preferably ethyl
- n is from 2 to 6.
- the amount of final catalyst obtained generally contains MgCl 2 in an amount which is only about 40% by weight of the amount of the starting support considering an n value of about 3. The percentage is even lower when n has higher values.
- Precursors that do not generate hydrogen chloride and that yield higher proportions of final catalysts are for example those disclosed in USP 4,220,554 that are of general formula MgX n (OR) 2 - J1 . Moreover, these precursors are able to generate a final catalyst characterized by a narrow particle size distribution even when the catalyst particles have small average diameter such as lower than 50 ⁇ m.
- One problem associated with this kind of precursor however was due to the not particularly high polymerization activity (in terms of amount of polymer per g of catalyst component) in the propylene polymerization when the catalyst is generated from the said precursor and contains 1,3-diethers as internal donors.
- the properties of the catalyst generated by said precursor for the ethylene polymerization are not satisfactory.
- precursors of formula MgCl n (OR) 2 _ n LB p in which LB is a Lewis base n is from 0.1 to 1.9, p is higher than 0.4, and R is a Cl -C 15 hydrocarbon group are prepared. While once reacted with an excess of titanium halide in the presence of a 1,3-diether as internal donor the derived catalysts are able to show high activity and stereospecificity in the propylene polymerization, their performances in the ethylene polymerization as a balance of activity, hydrogen response and morphological properties are not satisfactory.
- the said catalyst precursors comprising Mg, Cl, Ti, and OR groups that are in molar ratios defined by the formula MgQ n Ti p (OR) (2 - n ) +4P in which n is from 0.3 to less than 1.7, p is lower than
- p is lower than 0.5 and more preferably lower than 0.45 and especially it ranges from
- n ranges from 0.4 to 1.6 and more preferably from
- the molar ratio (OR)/C1 is lower than 3.8 and preferably is in the range of from 1.5 to
- R is preferably selected from Cl-ClO linear or branched alkyl groups and in particular from Cl-
- C8 linear or branched alkyl groups C8 linear or branched alkyl groups. Among them, methyl, ethyl, propyl, n-butyl, isobutyl, sec butyl and t-butyl are preferred. Ethyl is especially preferred.
- the particle size distribution can be narrow and this is expressed by the low value of the SPAN measurements carried out as mentioned below.
- the SPAN is lower than 1.8 preferably lower than 1.5, more preferably lower than 1.2 and especially lower than 1.
- the precursors of the present invention can be prepared according to several methods.
- One of the preferred methods comprises bringing into contact a Mg compound of formula of MgCl n (OR ⁇ n in which n is from 0.3 to less than 1.7, and R is as defined above, preferably ethyl, with a titanium compound of formula Ti(OR) 4 where R has the same meaning as defined above preferably ethyl, in a suitable inert liquid medium.
- the inert medium is selected among organic or inorganic liquids which are inert to the reactants mentioned above. Preferably they are selected among hydrocarbon liquid media, possibly halogenated, commonly used in the practice.
- the initial contact is preferably carried out at room temperature but then the temperature is raised under stirring, and brought to a value within the range 100-200 0 C in order to cause the reaction to take place.
- the maximum temperature at which the reaction takes place is also connected to the reaction time and to the stirring speed. Relatively high stirring speed may facilitate the reaction which can therefore be completed at relatively lower temperatures and shorter time. On the other hand, at higher temperatures the reaction is prone to be faster and this may allow slower stirring speed.
- the reaction takes place at a maximum temperature in the range from 50 to 200 0 C and preferably from 70 to 190 0 C.
- the molar ratios among the titanium compound and Mg compound used as starting components already reflect those found on the final solid. Therefore, the Ti compound is preferably used in molar ratios lower than 0.6 with respect to the Mg compound. If desired however, it is also possible to use higher molar ratios.
- the MgCl n (OR) 2 - n compounds can be generated by exchange reaction between organometallic compounds of formula Cl m MgR 2 - m , where m is from 0.1 to 1.9, and R is a hydrocarbon group, with an appropriate -OR source.
- the OR sources are for example ROH alcohols or, preferably, a silicon compound of formula (RO) r SiR 4 _ r where r is from 1 to 4 and R has the meaning given above, silicon tetra-ethoxide being preferred.
- organometallic compounds of formula Cl m MgR 2 - m can be obtained by reaction between Mg metal and an organic chloride RCl, in which R is as defined above, optionally in the presence of suitable promoters.
- R is as defined above
- the formation of Cl m MgR 2 - m and the further exchange with the OR source takes place in one single step.
- the reaction can be carried out in inert medium such as hydrocarbon that is liquid at room temperature.
- the catalyst precursors of the invention can be prepared by causing mixtures of MgCl 2 and Mg(OR) 2 to react in the presence of the Ti(OR) 4 compound in an inert medium.
- the reaction can take place according to the same process conditions described above for the use of MgCl n (OR) 2 - J1 as one of starting compounds.
- the molar ratio between MgCl 2 and Mg(OR) 2 is generally from 0.8 to 3, preferably from 0.9 to 2 and more preferably 1.
- a solution in a solvent having a boiling temperature higher than 60 0 C, OfMgCl 2 , Mg(OR) 2 and Ti(OR) 4 is obtained by adding a suitable amount of an aprotic Lewis base.
- aprotic Lewis base is preferably selected from ethers, esters, ketones, silanes, amines, nitriles and amides.
- it is selected from ethers or esters.
- Preferred ethers are the C2-C20 aliphatic ethers and in particular the cyclic ethers preferably having 3-5 carbon atoms such as tetrahydrofurane (THF), dioxane.
- Preferred esters are the alkyl esters of C1-C20 aliphatic carboxylic acids and in particular
- C1-C8 alkyl esters of aliphatic mono carboxylic acids such as ethyl acetate, methyl formate, ethyl formiate, methyl acetate, propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate.
- Preferred alkoxysilanes are those of formula R 1 a R 2 bSi(OR 3 ) c , where a and b are integer from 0 to 2, c is an integer from 1 to 4 and the sum (a+b+c) is 4; R 1 , R 2 , and R 3 , are alkyl, cycloalkyl or aryl radicals with 1-18 carbon atoms optionally containing heteroatoms. Particularly preferred are the silicon compounds in which a is 0 or 1, c is 2 or 3, R 2 is an alkyl or cycloalkyl group, optionally containing heteroatoms, and R 3 is methyl. Examples of such preferred silicon compounds are methyltrimethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane and t- butyltrimethoxysilane.
- ketones are those of formula R 4 COR 4 , in which the R 4 groups are, independently, a Cl-
- Preferred amines are those of formula NR 5 3 in which the R 5 groups are, independently, a C1-C20 hydrocarbon group.
- R 5 is a Cl-ClO alkyl group.
- Specific examples are triethylamine, triisopropylamine and tri-n-butylamine.
- Preferred amides are those of formula R 6 CONR 7 2 , in which R 6 is hydrogen or a C1-C20 hydrocarbon group and R 7 are, independently, a C1-C20 hydrocarbon group. Specific examples are N,N-dimethylformamide and N,N-dimethylacetamide.
- Preferred nitriles are those of formula R 8 CN where R 8 has the same meaning as R 4 .
- a specific example is acetonitrile.
- R 8 is a Cl-ClO alkyl group. Specific examples are methyl, ethyl, isopropyl, and butyl. .
- protic Lewis base (poly)alcohols are preferred. Particularly those of formula R(OH) in which R has the same meaning given above are preferred.
- the so obtained solution is brought at a temperature higher than 60 0 C and preferably higher than
- the precipitated catalyst precursor has the same brute formula above reported which indicates the formation of a specific compound.
- the confirmation about the obtainment of a crystalline pure product is obtained through the RX analysis showing sharp signals that where absent in the RX of the starting products and by the absence of signals attributable to the starting compounds.
- the precursors of the invention can, as such, already be used, in combination with an organoAl-compound preferably halogenated, in the polymerization of olefins and in particular of ethylene optionally in mixtures with alpha-olefins.
- these precursors can be advantageously used in the preparation of catalyst components for the polymerization of olefins.
- the said catalyst components can be obtained by contacting the precursors of the invention with compounds having halogenating capability.
- halogenated organo-Al compounds and fully or partially halogenated transition metals belonging to one of the groups 4 to 6 of the Periodic Table of Elements (new notation).
- transition metal compounds particularly preferred are titanium compounds of formula Ti(OR) n X y - n in which n is comprised between 0 and 3; y is the valence of titanium; X is halogen and R is an alkyl radical having 1-10 carbon atoms or a COR group.
- titanium tetrahalides or trihalogenalcoholates are TiCl3, TiCl 4 , Ti(OBu)CIs, Ti(OBu) 2 Cl 2 .
- the contact is carried out by suspending the precursor in cold TiCl 4 (generally O 0 C); then the so obtained mixture is heated up to 30-130 0 C and kept at this temperature for 0.1-2 hours. After that the excess of TiCl 4 is removed and the solid component is recovered. The treatment with TiCl 4 can be carried out one or more times.
- a steromodulating electron donor compound can be added to the solid catalyst component in order to make it stereospecific for the alpha-olefins polymerization.
- the introduction of the electron donor can be done simultaneously with the reaction between transition metal compound and the adduct.
- the maximum titanation temperature is preferably higher than 80 0 C.
- Said electron donor compound can be same as, or different from, the LB compound mentioned above and is generally selected from esters, ethers, amines, and ketones. In particular, as mentioned above, excellent results have been obtained with the use of 1,3- diethers of formula (I)
- R 1 and R ⁇ are the same or different and are hydrogen or linear or branched Ci -C is hydrocarbon groups which can also form one or more cyclic structures; R m groups, equal or different from each other, are hydrogen or Ci -C is hydrocarbon groups; R ⁇ groups equal or different from each other, have the same meaning of R m except that they cannot be hydrogen; each of R 1 to R ⁇ groups can contain heteroatoms selected from halogens, N, O, S and Si.
- R ⁇ is a 1-6 carbon atom alkyl radical and more particularly a methyl while the R m radicals are preferably hydrogen.
- R ⁇ can be ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, isopentyl, 2- ethylhexyl, cyclopentyl, cyclohexyl, methylcyclohexyl, phenyl or benzyl;
- R ⁇ when R 1 is hydrogen, R ⁇ can be ethyl, butyl, sec-butyl, tert-butyl, 2-ethylhexyl, cyclohexylethyl, diphenylmethyl, p-chlorophenyl, 1-naphthyl, 1-decahydronaphthyl; R 1 and R ⁇ can also
- ethers that can be advantageously used include: 2-(2-ethylhexyl)-l,3- dimethoxypropane, 2-isopropyl-l,3-dimethoxypropane, 2-butyl-l,3-dimethoxypropane, 2- sec-butyl- 1 ,3-dimethoxypropane, 2-cyclohexyl- 1 ,3-dimethoxypropane, 2-phenyl- 1,3- dimethoxypropane, 2-tert-butyl-l,3-dimethoxypropane, 2-cumyl-l,3-dimethoxypropane, 2- (2-phenylethyl)- 1 ,3-dimethoxypropane, 2-(2-cyclohexylethyl)- 1 ,3-dimethoxypropane, 2-(p- chlorophenyl)- 1 ,3-dimethoxypropane, 2-(diphenylmethyl)- 1
- radicals R ⁇ have the same meaning explained above and the radicals R m and R v radicals, equal or different to each other, are selected from the group consisting of hydrogen; halogens, preferably Cl and F; 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 R v radicals can be bonded to each other to form condensed cyclic structures, saturated or unsaturated, optionally substituted with R VI radicals selected from the group consisting of halogens, preferably Cl and F; Q-C20 alkyl radicals, linear or branched; C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl and C7-C20 aralkyl radicals; said radicals R v and R VI optionally containing one or more heteroatoms
- all the R m radicals are hydrogen, and all the R radicals are methyl.
- R ,vi radicals equal or different are hydrogen; halogens, preferably Cl and F; C 1 - C20 alkyl radicals, linear or branched; C3-C20 cycloalkyl, C 6 -C 2 O aryl, C 7 -C 20 alkylaryl and C 7 -C 2 O aralkyl radicals, optionally containing one or more heteroatoms selected from the group consisting of N, O, S, P, Si and halogens, in particular Cl and F, as substitutes for carbon or hydrogen atoms, or both; the radicals R m and R ⁇ are as defined above for formula (II).
- the catalyst components obtained by using these diethers in fact have improved properties, in terms of polymerization activity and stereospecificity, over those obtained by contacting the titanium compound and the 1,3-diether with precursors of the prior art such as those described in USP 4,315,835.
- Suitable electron donors are also the alkyl and aryl esters of mono- or poly-carboxylic acids, preferably for example esters of benzoic, phthalic, malonic, glutaric and succinic acids. Specific examples of such esters are di-n-butyl phthalate, diisobutyl phthalate, di-n-octyl phthalate, diethyl
- the electron donor compound used in the preparation of the catalyst generally ranges, in molar ratios with respect to the magnesium, from 1 :2 to 1 :20.
- the solid catalyst components according to the present invention may show a surface area (by
- B.E.T. method generally between 10 and 500 m 2 /g and preferably between 20 and 350 m 2 /g.
- the alkyl-Al compound is preferably chosen among the trialkyl aluminum compounds such as for example triethylaluminum (TEAL), triisobutylaluminum (TIBAL), tri-n-butylaluminum, tri-n- hexylaluminum, tri-n-octylaluminum.
- alkylaluminum halides alkylaluminum hydrides or alkylaluminum sesquichlorides such as AlEt 2 Cl and Al 2 Et 3 CIs more preferably in mixture with said trialkylaluminum compounds.
- TEAL/DEAC in various ratios are preferred.
- the total Al/Ti ratio is higher than 1 and is generally comprised between 20 and 800.
- an electron donor compound (external donor) which can be the same or different from the compound used as internal donor can be used in the preparation of the catalysts disclosed above.
- the external donor is preferably selected from the silicon compounds containing at least a Si-OR link, having the formula R a 1 Rb 2 Si(OR 3 ) c , where a and b are integer from 0 to 2, c is an integer from 1 to 3 and the sum (a+b+c) is 4; R 1 , R 2 , and R 3 , are alkyl, cycloalkyl or aryl radicals with 1-18 carbon atoms.
- R 1 and R 2 is selected from branched alkyl, cycloalkyl or aryl groups with 3-10 carbon atoms and R 3 is a Ci-Cio alkyl group, in particular methyl.
- examples of such preferred silicon compounds are methylcyclohexyldimethoxysilane, diphenyldimethoxysilane, methyl-t-butyldimethoxysilane, and dicyclopentyldimethoxysilane.
- a is 0, c is 3
- R 2 is a branched alkyl or cycloalkyl group and R 3 is methyl.
- Examples of such preferred silicon compounds are cyclohexyltrime
- 1,3-diethers having the previously described formula can be used as external donor.
- the use of an external donor could be avoided, as the stereospecificity of the catalyst is already sufficiently high for polymers to be used in various applications.
- the catalysts of the invention can be used in any of the olefin polymerization processes known in the art. They can be used for example in slurry polymerization using as diluent an inert hydrocarbon solvent or bulk polymerization using the liquid monomer (for example propylene) as a reaction medium. The slurry or bulk polymerization can be carried out both in agitated vessels or in loop reactors. It is also possible to use two or more vessels or loop reactors connected in series or running in parallel. Moreover, the catalyst described in the present application can also be used in the polymerization process carried out in gas-phase operating in one or more fluidized or mechanically agitated bed reactors.
- the polymerization is generally carried out at temperature of from 20 to 120 0 C, preferably of from 40 to 80 0 C.
- the operating pressure is generally between 0.1 and 10 MPa, preferably between 1 and 5 MPa.
- the operating pressure is generally between 1 and 6 MPa preferably between 1.5 and 4 MPa.
- the catalysts of the invention are very useful for preparing a broad range of polyolefin products.
- olefinic polymers which can be prepared are: high density ethylene polymers (HDPE, having a density higher than 0.940 g/cc), comprising ethylene homopolymers and copolymers of ethylene with alpha-olefins having 3-12 carbon atoms; linear low density polyethylenes (LLDPE, having a density lower than 0.940 g/cc) and very low density and ultra low density (VLDPE and ULDPE, having a density lower than 0.920 g/cc, to 0.880 g/cc) consisting of copolymers of ethylene with one or more alpha-olefins having from 3 to 12 carbon atoms, having a mole content of units derived from the ethylene higher than 80%; isotactic polypropylenes and crystalline copolymers of propylene and ethylene and/or other alpha-olefins having a content of units derived from propylene higher than 85% by weight; copolymers of propylene
- the particle size distribution (SPAN) is calculated with the
- P90 -/ 3 IO formula wherein P90 is the value of the diameter such that 90% of the total
- P50 volume of particles have a diameter lower than that value; PlO is the value of the diameter such that 10% of the total volume of particles have a diameter lower than that value and P50 is the value of the diameter such that 50% of the total volume of particles have a diameter lower than that value.
- Intrinsic viscosity determined in tetrahydronaphthalene at 135°C.
- Procedure (A) The procedure is the same as Procedure (A) with the difference that only TEA (no DEAC) is used.
- the mixture was heated at 45°C for 4h to obtain a solution. At this point, the solution was heated under reflux (about 88°C) while maintaining the stirring speed about 800 rpm. After few minutes under reflux, the solution became opalescent with the formation of a precipitate.
- the precipitated solid was recovered by filtration, washed twice with 50 ml of toluene, thrice with 100 ml of hexane and finally dried under vacuum. 16g of granular solid were recovered, with an average particle size of 10 micron with a narrow particle size distribution (Span 0.8).
- Example 4 The synthesis of the catalyst precursor according to Example 1 was repeated, the only differences being that amount of Ti(OEt) 4 used was 17.4 ml (0.084 mol) and stirring speed was 600 rpm. The solid recovered was analyzed and found to have the following molar ratios: Mg/Ti/Cl/ETOH 1/0.32/0.74/2.49. X-ray analysis showed no signals attributable to the starting magnesium compounds. Average particle size was 28 micron and particle size distribution was narrow (SPAN 0.9). The so obtained catalyst precursor was used in the homopolymerization of ethylene according to procedure (A). The results are reported in table 1.
- This solution was converted in solid powder by using a B ⁇ chi Mini Spray Dryer, model B-290.
- the solution was sprayed with a feed rate of 13 mL/min, with nitrogen as carrier gas, at an inlet temperature of 130 0 C, and an outlet temperature of 96°C.
- the recovered solid showed spherical shape, an average particle size of 15 micron, and found to have the following molar ratios: Mg/Ti/Cl/ETOH 1/0.29/1.01/2.03.
- X-ray analysis showed no signals attributable to the starting magnesium compounds.
- Example 6 The synthesis of the precursor was performed as described in Example 1 of USP 4,220,554.
- the so obtained support has the following composition: Mg, 20.2 wt.%; Cl, 29.8 wt.%; EtOH groups 41.5 wt.%.
- To 12 g of this precursor the same procedure of example 5 was applied.
- the so obtained catalyst was used in the homopolymerization of propylene according to procedures (I and II). The results are reported in table 2.
- a solid catalyst precursor was prepared according to the same procedure disclosed in example 6 with the only difference that the Ti/Mg molar ratio was 1 and that the reaction time was 3 hours. It was obtained a granular solid with an average particle size of 12 micron, a narrow particle size distribution (SPAN 0.7) and a composition according to the following molar ratios: Mg/Ti/Cl/ETOH 1/0.31/0.92/2.30. X-ray analysis showed no signals attributable to the starting magnesium compounds. The so obtained catalyst was used in the homopolymerization of ethylene according to procedure (A). The results are reported in table 1.
- a solid catalyst precursor was prepared according to the same procedure disclosed in example 6 with the only difference that the reaction temperature was 180 0 C and reaction times 3hrs. It was obtained a granular solid with an average particle size of 12 micron, a narrow particle size distribution (SPAN 0.8) a composition according to the following molar ratios: Mg/Ti/Cl/ETOH 1/0.29/1.10/2.05. X-ray analysis showed no signals attributable to the starting magnesium compounds.
- the so obtained catalyst was used in the homopolymerization of ethylene according to procedure (A) and according to a variation of said procedure in which TIBAL was used instead of TEA.
- the catalyst precursor was also used in the copolymerization of ethylene according to the above general procedure. The results are reported in table 1.
- a catalyst precursor was prepared according to the same procedure disclosed in example 10 with the only difference that the reaction times was 6hrs and the stirring speed was 450RPM. It was obtained a granular solid with an average particle size of 26 micron, a narrow particle size distribution (SPAN 1.2) a composition according to the following molar ratios: Mg/Ti/Cl/ETOH 1/0.28/0.98/2.14. X-ray analysis showed no signals attributable to the starting magnesium compounds.
- a catalyst precursor was prepared according to the same procedure disclosed in example 15 with the only difference that 155 mmoles of a 50:50 molar mixture of Ti(OEt) 4 and Ti(Z- OPr) 4 were used instead of sole Ti(OnPr) 4 It was obtained a granular solid with an average particle size of 30 micron, a narrow particle size distribution (SPAN 1.2) and a composition according to the following molar ratios: Mg/Ti/Cl/ETOH/z-PrOH 1/0.22/1.05/1.20/0.41. The so obtained catalyst was used in the homopolymerization of ethylene according to procedure (A). The results are reported in table 1.
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US12/308,623 US8062989B2 (en) | 2006-06-23 | 2007-06-01 | Magnesium chloroakolate-based catalyst precursors |
CN200780023448.3A CN101472957B (en) | 2006-06-23 | 2007-06-01 | Magnesium chloroalkolate-based catalyst precursors |
EP07729787A EP2032612A1 (en) | 2006-06-23 | 2007-06-01 | Magnesium chloroalkolate-based catalyst precursors |
JP2009517075A JP2009541545A (en) | 2006-06-23 | 2007-06-01 | Catalyst precursor based on magnesium chloro alcoholate |
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EP2610273B1 (en) * | 2011-12-30 | 2018-02-07 | Borealis AG | Catalyst component |
MY183125A (en) * | 2014-04-29 | 2021-02-15 | Beijing Res Inst Chemical Ind China Petroleum & Chemical Corp | Magnesium halide solution, preparing method and use thereof |
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US20100160154A1 (en) | 2010-06-24 |
US8062989B2 (en) | 2011-11-22 |
EP2032612A1 (en) | 2009-03-11 |
KR20090034350A (en) | 2009-04-07 |
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