摘要:
Disclosed is a catalyst system for the homopolymerization and copolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a dimeric or tetrameric cyclopentadienyl Group 6b metal compound in which the metal has an oxidation state of +2, said Group 6b metal compound being supported on an inorganic support. The catalyst system may also contain a Group 2 or Group 3 metal alkyl compound cocatalyst.
摘要:
Chromium catalyst compositions are provided. Theses chromium catalyst compositions can be used to polymerized olefins. The resulting polymerization product can have improved properties.
摘要:
Olefin polymerization catalysts capable of polymerizing olefins such as ethylene to polyolefins with broad molecular weight distributions are made by depositing on an oxide suport (or especially phosphate derivative thereof) (i) a chromium complex of formula RCr-L, where R is optionally substituted pentadienyl or cyclopentadienyl and L is a reactive ligand, or a bis arene chromium and (ii) a metal complex of formula MR³ R⁴ R⁵ R⁶ wherein M is Ti, Zr or Hf, and R³-R⁶ can be allyl (when M is Zr or Hf) or of 4-20 carbons of formula (a) CH₂ X (R⁷ R⁸ R⁹) where X = C, Si or Ge and R⁷-R⁹ are hydrocarbyl, or (b) CH₂ Ar where Ar is optionally substituted aromatic, or said metal complex is of formula Ti R¹¹ R¹², where R¹¹ and R¹² are acyclic dienyl.
摘要翻译:能够将烯烃如乙烯聚合成具有宽分子量分布的聚烯烃的烯烃聚合催化剂通过在氧化物(或其特别是磷酸酯衍生物)上沉积(i)式RCr-L的铬络合物来制备,其中R是任选取代的戊二烯基 或环戊二烯基,L为反应性配体或双芳烃铬,和(ii)式为MR 3 R 4 R 5 R 6的金属络合物,其中M为Ti,Zr或Hf,R为 R 3可以是烯丙基(当M是Zr或Hf时)或4-20个碳原子的式(a)CH 2 X(R 7 R 8 R 9),其中X = C ,Si或Ge和R 7 -R 9是烃基,或(b)CH 2 Ar,其中Ar是任选取代的芳族,或所述金属络合物具有式Ti R 1 R 1, 2>,其中R 1和R 2均为非环状二烯基。
摘要:
The present invention relates to an olefin polymerization catalyst obtainable by depositing on a dry inorganic oxide support a monocuclear chromium complex to produce a catalyst precursor and thereafter by thermally activating the said catalyst precursor. The catalyst is characterised in that the mononuclear chromium complex is representable by the general formula: wherein: - the cyclopentadienyl ligand is substituted with 4 or 5 hydrocarbon groups containing 1 to 3 carbon atoms, - x is an integer from 1 to 4, and - L is either a four-or five-substituted cyclopentadienyl ligand, or (CO)₃R in which R is H, methyl or ethyl. The catalyst is used for polymerizing olefins, particularly ethylene optionally with C₃-C₈ alpha-olefins. It produces polyolefins having a relatively high molecular weight and a broad molecular weight distribution.
摘要:
The present invention relates to an olefin polymerization obtainable by depositing on a dry inorganic oxide support at least one mononuclear chromium complex, which is representable by the general formula: wherein - the cyclopentadienyl ligand is substituted with 4 or 5 hydrocarbyl groups (R1-R5) containing 1 to 3 carbon atoms, and - L is one or more hydrocarbyl ligands which are sufficiently reactive to enable the complex to react with the inorganic oxide without thermal activation. The catalyst can be used without thermal activation for polymerizing olefins, particularly ethylene optionally with C₃₋₈ alpha-olefins. It produces polyolefins having broad molecular weight distribution.
摘要:
A poly-unsaturated cyclic polymer can be prepared by the polymerization of alkyne monomers with a catalyst that is selected from trianionic pincer ligand supported metal-alkylidyne complexes, tetraanionic pincer ligand supported metal-alkynes, or tetraanionic pincer ligand supported metallacycloalkylene complexes. The [O 2 C( t BuC=)W( η 2 -HC≡ C t Bu)] (4) provides high polymerization rates and high molecular weight cyclic polymers. The poly-unsaturated cyclic polymers can be hydrogenated to saturated cyclic polymers. A cyclic polyphenylacetylene can be converted into a cyclic polystyrene.
摘要:
The invention relates to a process for obtaining alpha-olefins by heterogeneous catalytic ethenolysis of optionally-functionalized unsaturated, in particular mono- unsaturated, olefins. The invention also relates to new supported catalysts that can be used in the process of the invention and to a method for preparing said supported catalysts.
摘要:
Provided are a transition metal carbene complex represented by the following general formula (1) and a method of producing the same. (In general formula (1), M represents for example a molybdenum atom, R 1 represents for example a C 1 -C 20 alkyl group optionally having a substituent, L to L 3 each represent a ligand selected for example from a halogen group, R 2 and R 3 each represent for example a hydrogen atom or a C 1 -C 20 alkyl group optionally having a substituent, A represents for example a nitrogen atom, and R 4 to R 7 each represent for example a C 1 -C 20 alkyl group optionally having a substituent.)
摘要:
Provided are a transition metal carbene complex represented by the following general formula (1) and a method of producing the same. (In general formula (1), M represents for example a molybdenum atom, R 1 represents for example a C 1 -C 20 alkyl group optionally having a substituent, L to L 3 each represent a ligand selected for example from a halogen group, R 2 and R 3 each represent for example a hydrogen atom or a C 1 -C 20 alkyl group optionally having a substituent, A represents for example a nitrogen atom, and R 4 to R 7 each represent for example a C 1 -C 20 alkyl group optionally having a substituent.)