摘要:
Specific iron complexes (A), a catalyst system for polymerization of olefins comprising at least one metal complex (A) and/or (A'), a prepolymerized catalyst system, the use of these catalyst systems for the polymerization of olefins, and a process for the preparation of polyolefins by polymerization or copolymerization of olefins in the presence of one of the described catalyst systems.
摘要:
Disclosed herein are novel polymer-tethered ligands, metal complexes comprising these ligands, and the use of these complexes as chain transfer catalysts to control the molecular weight of oligomeric and polymeric materials produced in a radical polymerization process. The materials made by the processes disclosed herein have significantly reduced color, making them suitable for a wide range of color-critical end-uses, including automotive coatings.
摘要:
The invention relates to a catalytic solid for olefinic polymerisation, comprising A) at least one calcined hydrotalcite and B) at least one organic transition metal compound. The invention further relates to a catalyst system, comprising the catalytic solid, the use of the catalytic solid for the polymerisation or co-polymerisation of olefins and a method for the production of polyolefins by polymerisation or co-polymerisation of olefins in the presence of the catalytic solid.
摘要:
Disclosed herein is a polyolefin nanocomposite prepared by plymerizing an olefin monomer in a catalyst system comprising (1) a supported catalyst consisting of a polymer, a silicate clay mineral, and a transition metal compound, and cocatalyst, an alkyl aluminoxane.
摘要:
The present invention provides a supported catalyst comprising (A) a polymer (B) a supporter, (C) a transition metal compound, and optionally (D) (a) a compound which can form an ionic complex by the reaction with the transition metal compound or (b) a specific oxygen-containing compound, and (E) an alkylaluminum compound. The supported catalyst according to present invention, which has a high activity, can be used for preparing a styrenic polymer with a high syndiotacticity. The supported catalyst can be used in combination with a cocatalyst, preferably an alkyl aluminoxane.
摘要:
A two-step olefin polymerization process is disclosed. A single-site catalyst precursor reacts with a boron-containing activator and a first olefin substantially in the absence of an alumoxane to produce a stable, prepolymer complex, which is then used to polymerize a second olefin in the presence of a scavenging amount of an alumoxane. The process gives high molecular weight polyolefins with low residual aluminum contents. Boron-containing activators can be used, even at reaction temperatures greater than 100 DEG C, while maintaining high catalyst activity.
摘要:
The invention relates to propylene terpolymers containing between 80 and 99.5 mol % structural units derived from propylene, between 0.1 and 15 mol % structural units derived from ethene or a C4-C6-1-olefin (I) and between 0.1 and 15 mol % structural units derived from a C4-C12-1-olefin (II) which differs from the C4-C6-1-olefin (I). The propylene terpolymers contain a proportion of regioregularly '1-2' inserted propylene units corresponding to formula (1) of more than 0.99, have a melting point TM, determined on the basis of the differential scanning calorimetry peak maximum, of less than 135 DEG C and a molar mass (MW) weight average of more than 80,000 g/mol. The xylol-soluble portion (XL) of the propylene terpolymers in weight % corresponds to the inequation (2): XL
摘要:
A method comprising polymerizing ethylene and 1-hexene to produce a linear, low density polymer, is provided wherein said polymerization is conducted under slurry polymerization conditions in a loop reactor, using a solid metallocene-containing catalyst system.
摘要:
Process for manufacturing ethylene copolymers by polymerizing ethylene and a minor amount of C3-C6 alphaolefins in particle form in slurry reactor in the presence of an ethylene polymerizing catalyst. According to the invention the polymerization is carried out in propane diluent by using a metallocene catalyst activated with an alumoxane compound.