RU2001113445A - Bridged metallocenes for olefin copolymerization - Google Patents

Claims (20)

1. An organometallic compound with an element of group 4, comprising two auxiliary monoanionic ligands, each of which may independently be substituted or unsubstituted, where the ligands are linked by a covalent bridge containing one substituted atom of an element of group 14, the substituents of this atom of an element of group 14 include aryl groups at least one of which contains at least one substituent group gidrokarbilsililnuyu where gidrokarbilsililny this substituent has the formula R _{n "SiR '3-n,} where each of R 'independently of one another are C ₁ -C ₂₀ hydrocarbyl, or gidrokarbilsililny gidroftorkarbilny substituent, R''denotes a linking C ₁ -C ₁₀ group between Si and the aryl group, and n = 0 or 1. 2. The organometallic compound of claim 1, wherein each R ′ is a linear or branched C ₁ -C ₆ alkyl substituent. 3. The organometallic compound of claim 2, wherein the catalytic compound is a hafnium-containing organometallic compound and the carbon atom is replaced by an atom of group 14. 4. The organometallic compound of claim 3, wherein the compound is a bicyclopentadienyl organometallic hafnium-containing compound, comprising I) at least one unsubstituted cyclopentadienyl or indenyl ligand, II) one cyclopentadienyl ligand substituted by aromatic fused rings. 5. The organometallic compound of claim 3, wherein the cyclopentadienyl ligand substituted by aromatic fused rings is a substituted or unsubstituted fluorenyl ligand. 6. The organometallic compound of claim 5, wherein the unsubstituted cyclopentadienyl ligand or cyclopentadienyl ligand substituted by aromatic fused rings is an unsubstituted cyclopentadienyl ligand. 7. The organometallic compound of claim 6, wherein the hafnium compound is selected from the group consisting of di (p-trimethylsilylphenyl) methylene (cyclopentadienyl) (fluorenyl) hafniumdimethyl, di (p-trimethylsilylphenyl) methylene (cyclopentadienyl) (2,7-dimethyl- 9-fluorenyl) hafnium dimethyl and di (p-trimethylsilylphenyl) methylene (cyclopentadienyl) (2,7-ditret-butyl-9-fluorenyl) hafnium dimethyl, di (p-triethylsilyl phenyl) methylene (cyclopentadienyl) (fluorenyl) hafnium dimethyl triethylsilylphenyl) methylene (cyclopentadienyl) (2,7-dimethyl-9-fluorenyl) hafniumdimethyl, di (p-triethylsilylphenyl) me ylene (cyclopentadienyl) (2,7-ditret-butyl-9-fluorenyl) hafnium dimethyl, di (p-triethylsilyl phenyl) (p-tert-butylphenyl) methylene (cyclopentadienyl) (fluorenyl) hafnium dimethyl, (p-triethylsilylphenyl) (p-n-butylphenyl) ) methylene- (cyclopentadienyl) (2,7-dimethyl-9-fluorenyl) hafnium dimethyl, (p-triethylsilyl phenyl) (p-n-butyl phenyl) methylene (cyclopentadienyl) (2,7-ditret-butyl-9-fluorenyl) hafnium dimethyl and (p-triethylsilylphenyl) (p-n-butylphenyl) methylene (cyclopentadienyl) (2,7-dimethyl-9-fluorenyl) hafnium dimethyl. 8. The method of polymerization in the preparation of ethylene copolymers having a density of 0.850-0.940, comprising introducing under the conditions of polymerization in solution at a reaction temperature of ethylene equal to or higher than 60 to 225 ° C and one or more comonomers capable of polymerization by contacting with catalytic a compound derivatized from an organometallic compound with an element of group 4 according to claims 1 to 7. 9. The method of claim 8, in which the catalytic compound is a hafnium-containing organometallic compound, and the carbon atom is replaced by an atom of group 14. 10. The method of claim 8, wherein the catalytic compound is derivatized by reaction with an activating cocatalytic compound. 11. The method of claim 10, wherein the cocatalytic compound comprises a halogenated tetraaryl substituted anion with an element of group 13. 12. The method according to claim 11, in which the aryl substituent includes at least one condensed polycyclic aromatic ring. 13. The method according to item 12, in which the halogenated tetraaryl anion with an element of group 13 is [tetrakis (perfluoronaphthyl) borate]. 14. The method according to any one of claims 11 to 13, in which the cocatalytic compound further comprises a substantially cationic complex selected from substituted or unsubstituted aniline, ammonium, carbenium, silylium and metal-containing cationic complexes. 15. The method according to any one of claims 8 to 14, in which the continuous process of polymerization in solution is carried out under adiabatic conditions. 16. The method according to clause 15, in which the reaction temperature is in the range of 160-250 ° C. 17. The method according to clause 16, in which the continuous polymerization process under homogeneous conditions is carried out under a pressure of at least 500 bar. 18. The method according to any one of paragraphs.8-17, in which one or more comonomers capable of incorporation polymerization is selected from the group consisting of one or more C ₃ -C ₈ -α-olefins, C ₅ -C ₁₅ diolefins, cyclic C ₇ -C ₂₀ olefins and diolefins and vinyl aromatic C ₇ -C ₂₀ monomers. 19. The method according to p, in which one or more comonomers capable of incorporation polymerization is selected from the group consisting of propylene, 1-butene, 1-hexene, 1-octene, 2-ethylidene-5-norbornene and 2-vinyl -5-norbornene. 20. The method of claim 8, in which the organometallic compound with an element of group 4 is a monocyclopentadienyl heteroatom containing titanium compound.