摘要:
A process for the polymerization of olefins, in particular a process for the copolymerization of propylene with further olefins, is carried out in the presence of highly active catalyst systems comprising specifically selected metallocenes, in particular ones which bear different substituents in position 2 and position 4 on an indenyl ligand. Novel polypropylene copolymers can be obtained by this process.
摘要:
A process for the polymerization of olefins, in particular a process for the copolymerization of propylene with further olefins, is carried out in the presence of highly active catalyst systems comprising specifically selected metallocenes, in particular ones which bear different substituents in position 2 and position 4 on an indenyl ligand. Novel polypropylene copolymers can be obtained by this process.
摘要:
A process for the polymerization of olefins, in particular a process for the copolymerization of propylene with further olefins, is carried out in the presence of highly active catalyst systems comprising specifically selected metallocenes, in particular ones which bear different substituents in position 2 position 4 on an indenyl ligand. Novel polypropylene copolymers can be obtained by this process.
摘要:
A catalyst solid comprising: A) support particles having a mean particle diameter d50 of from 5 to 200 μm and a specific surface area of from 30 to 1 000 m2/g and obtainable by agglomeration of primary particles of a pyrogenic silica having a mean particle diameter dm of from 1 to 50 nm, and B) at least one organic transition metal compound, can be used for the polymerization or copolymerization of olefins.
摘要:
Disclosed are compounds of the following core structure, and their use as polymerization catalysts: wherein M1 is a group lVb transition metal, R5 is a substituted aryl group, and Ra forms a heteroatom-containing ring fused to the cyclopentadienyl ring.
摘要:
A catalyst system comprising at least one metallocene, at least one cocatalyst, at least one support material and, if desired, further organometallic compounds is described.The catalyst system can advantageously be used for the polymerization of olefins and displays a high catalyst activity and gives a good polymer morphology without it being necessary to use aluminoxanes such as methylaluminoxane (MAO), which usually has to be used in high excess, as cocatalyst.
摘要:
Ligand systems containing indenyl structures, transition metal compounds of the metallocene type and catalyst systems comprising such transition metal compounds are described. The novel transition metal compounds can be used in the polymerization of olefins, in particular to give polyolefins having a low molar mass.
摘要:
A boron-containing zwitterionic neutral transition metal compound which can advantageously be used for the polymerization of olefins is described. Here, the use of aluminoxanes, such as methylaluminoxane (MAO), as a cocatalyst can be dispensed with and a high catalyst activity and a good polymer morphology can nevertheless be achieved.
摘要:
Metallocene catalysts for the preparation of polyolefins, in particular polypropylene having elastomeric properties, having specific heteroaromatics in position 2 or 3 of the indenyl system. Particular preference is given to unbridged metallocene compounds of the formula II: where M, X and R3 to R8 are defined herein.
摘要:
The present invention relates to a process for preparing a catalyst for olefin polymerization which is obtainable by bringing A) at least one organic transition metal compound, B) a mixture of at least two different organo metallic compounds and C) at least one cation-forming compound into contact with one another, wherein the organic transition metal compound A) is firstly brought into contact with the mixture of the organo metallic compounds B). In addition, the invention relates to the use of the catalyst for olefin polymerization, to catalysts obtainable by this process and to a process for the polymerization of olefins in which these catalysts are used.