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:
An object of the present invention is to provide polyethylene having excellent moldability and impact resistance and excellent balance between rigidity and durability, produced using a novel organoaluminum compound-supported chromium catalyst, a method for producing polyethylene, and a hollow plastic molding containing the polyethylene. The polyethylene of the invention is polymerized using a chromium catalyst, and has a weight average molecular weight (Mw) of 30,000 or more at the maximum value in a branching degree distribution curve that shows a molecular weight dependency of short chain branches having 4 or more carbon atoms.
摘要:
A catalyst system comprising a half-sandwich chromium complex, an activator support and an optional cocatalyst. A compound of formula Cp'Cr(Cl)2(Ln), where Cp' is eta5-C5H4CH2CH2CH=CH2 and Ln is pyridine, THF or diethylether. A compound of formula Cp''Cr(Cl)2(Ln), where Cp'' is eta5-C5H4C(Me)2CH2CH2CH=CH2 and Ln is pyridine, THF or diethylether.
摘要:
The invention concerns the use of a catalyst comprising chromium hydride species heat-stable at 400 °C, bound to the surface of a mineral support, in particular silica, for olefin polymerisation.
摘要:
The present invention is directed to producing a resin which, when formed into a film, has excellent gas barrier and/or moisture barrier (low MVTR) properties. Further, the resin has a relatively high molecular weight distribution, preferably above 6, and has excellent processability/extrudability. The resin is produced using a cyclopentadienyl chromium compound, preferably a mono CpCr compound, on a support, preferably a silica support. A particularly preferred catalyst for use in the present invention comprises pentamethylcyclopentadienyldimethylchromiumpyridine. Preferably, the catalyst is used in a slurry polymerization process.
摘要:
The present invention relates to an olefin polymerisation catalyst obtainable by depositing on a dry inorganic oxide support a mononuclear chromium complex which is a mixture of (A) a first mononuclear chromium complex represented by the general formula: wherein - three of R₁ to R₅ are H and the other two are H, or C₁-3 hydrocarbyl group, 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, and (B) a second mononuclear chromium complex 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 has the same definition as above, being identical or different. The catalyst can be used for polymerising olefins, particularly ethylene optionally with C₃-8 alpha-olefins. It can be thermally activated before use in olefin polymerisation. It produces polyolefins having a relatively broad molecular weight distribution, the breadth and shape of which being easily controlled.