EP0604908A2
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EP
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Metallocene compounds having ligands of fluorenylic type
Assignee: Basell Technology Co BV
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Filing: 1993-12-23
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Granted: —
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Expires: 2013-12-23
Abstract
Abstract Bridged, fluorenyl-containing metallocenes are disclosed, having the formula (I) wherein substituents R¹ are, for example, hydrogen atoms or alkyl groups, M is Ti, Zr or Hf, substituents R² are, for example, halogens or alkyl groups, the bridging group R³ is, for example, a dialkylsilandiyl divalent radical. These metallocenes are useful as catalyst components for the polymerization of olefins and, expecially, for the preparation of high molecular weight atactic polypropylene.
Inventors
- 👤 Luigi Resconi
- 👤 Robert Lawrence Jones
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
CPC Classifications
C; C07; C07F; C07F17/00; C08; C08F; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65908; C08F4/65912; C08F4/6592; C08F4/65922; C08F4/65927
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
A metallocene of the formula (I) wherein substituents R¹, the same or different from each other, are hydrogen atoms, C₁-C₂₀ alkyl radicals, C₃-C₂₀ cycloalkyl radicals, C₂-C₂₀ alkenyl radicals, C₆-C₂₀ aryl radicals, C₇-C₂₀ alkylaryl radicals, or C₇-C₂₀ arylalkyl radicals, optionally two adjacent substituents R¹ can form a cycle comprising from 5 to 8 carbon atoms and, furthermore, substituents R¹ can contain Si or Ge atoms; M is Ti, Zr or Hf; substituents R², the same or different from each other, are halogen atoms, -OH, -SH, R¹, -OR¹, -SR¹, -NR¹₂ or PR¹₂, wherein R¹ is defined as above; the group R³ is selected from >CR¹₂, >SiR¹₂, >GeR¹₂, >NR¹ or >PR¹, wherein R¹ is defined as above and optionally, when R³ is >CR¹₂, >SiR¹₂ or >GeR¹₂, both substituents R¹ can form a cycle comprising from 3 to 8 atoms.
Claim 2
Dependent Claim
27 words
The metallocene according to claim 1, wherein substituents R¹ are hydrogen atoms, substituents R² are chlorine or methyl groups, and the group R³ is a radical >Si(CH₃)₂.
Claim 3
Dependent Claim
2 words
Dimethylsilandiylbis(fluorenyl)zirconium dichloride.
Claim 4
Dependent Claim
181 words
A process for the preparation of a metallocene of formula (I) as claimed in claim 1, comprising: (a) the reaction of a compound of formula (II) wherein substitutents R¹, the same or different from each other, are defined as above, with a compound able to form the anion of formula (III) and thereafter with a compound of formula R³X₂, wherein R³ is defined as above, and the substituents X, the same or different from each other, are halogen atoms, thus obtaining a compound of formula (IV) (b) the subsequent reaction of the compound of formula (IV) obtained at point (a) with a compound able to form the dianion of formula (V) and thereafter with a compound of formula MX₄, wherein M and the substituents X are defined as above, thus obtaining the compound of formula (VI) and finally, (c) in the case at least one R² in the metallocene of formula (I) to be prepared is different from halogen, the substitution of at least one substituent X in the compound of formula (VI) with at least one R² different from halogen.
Claim 5
Dependent Claim
11 words
The process according to claim 4, wherein MX₄ is zirconium tetrachloride.
Claim 6
Dependent Claim
34 words
A compound of formula (IV) wherein substituents R¹ and the group R³ are defined as in claim 1 and, when R³ is a group >Si(CH₃)₂, at least one substituent R¹ is different from hydrogen.
Claim 7
Dependent Claim
14 words
The compound according to claim 6, wherein the group R³ is a radical >Si(CH₃)₂.
Claim 8
Dependent Claim
95 words
A catalyst for the polymerization of olefins comprising the product of the reaction between: (A) a metallocene of formula (I) as claimed in claim 1, optionally as reaction product with an aluminium organo-metallic compound of formula AlR⁴₃ or Al₂R⁴₆, wherein substituents R⁴, the same or different from each other, are R¹ or halogen, and (B) an alumoxane, optionally mixed with an aluminium organo-metallic compound of formula AlR⁴₃ or Al₂R⁴₆, wherein substituents R⁴, the same or different from each other, are defined as above, or one or more compounds able to give a metallocene alkyl cation.
Claim 9
Dependent Claim
89 words
The catalyst according to claim 8, wherein the compound able to form a metallocene alkyl cation is a compound of formula Y⁺Z⁻, wherein Y⁺ is a Bronsted acid, able to give a proton and to react irreversibly with a substituent R² of the metallocene of formula (I) and Z⁻ is a compatible anion, which does not coordinate, which is able to stabilize the active catalytic species originating from the reaction of the two compounds, and which is sufficiently labile to be able to be removed from an olefinic substrate.
Claim 10
Dependent Claim
16 words
The catalyst according to claim 9, wherein the anion Y⁺ comprises one or more boron atoms.
Claim 11
Dependent Claim
23 words
The catalyst according to claim 8, comprising the product of the reaction between dimethylsilandiylbis(fluorenyl)zirconium dichloride and a compound selected from methylalumoxane and isobutylalumoxane.
Claim 12
Dependent Claim
26 words
A process for the polymerization of olefins comprising the polymerization reaction of an olefinic monomer in the presence of a catalyst as claimed in claim 8.
References Cited (Backward Citations)
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