US 2003/0149199 A1 · Transition metal compound, ligand system, catalyst system and the use of the latter for polymerisation and copolymerisation of olefins

Abstract

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.

A process for the polymerization of olefins, in particular for the copolymerization of propylene with at least one further olefin, in which the polymerization is carried out in the presence of a catalyst system comprising at least one cocatalyst and at least one specifically substituted metallocene of the formula (I)

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M11 is a metal of group IVb of the Periodic Table of the Elements,
R31, R32 are identical or different and are each a hydrogen atom, a C1-C10-alkyl group, a C1-C10-alkoxy group, a C6-C20-aryl group, a C6-C10-aryloxy group, a C2-C10-alkenyl group, and OH group, an N(R32)2 group, where R32 is a C1-C10-alkyl group or a C6-C14-aryl group, or a halogen atom, where R31 and R32 can also be joined to form a ring,
R34, R36, R37 and R38 and also R34′, R36′, R37′, and R38′ are identical or different and are each a hydrogen atom or a hydrocarbon group which may be halogenated, linear, cyclic or branched, e.g. a C1-C10-alkyl group, a C2-C10-alkenyl group, a C6-C20-aryl group, a C7-C40-arylalkyl group, a C7-C40-alkylaryl group or a C8-C40-arylalkenyl group,
R33 and R33′ are identical or different, where
R33 is as defined for R33′ or is a hydrocarbon group which is unbranched in the α position and may be halogenated, e.g. a C1-C20-alkyl group, a C2-C20-alkenyl group, a C7-C40-alkylaryl group or a C8-C40-alkenylaryl group,
R33′ is a hydrocarbon group which is cyclized in the α position or branched in the α position and may be halogenated, e.g. a C3-C20-alkyl group, a C3-C20-alkenyl group, a C6-C20-aryl group, a C7-C40-arylalkyl group, a C7-C40-alkylaryl group or a C8-C40-arylalkenyl group,
R35, R35′ are identical or different and are each a C6-C20-aryl group which in the para position relative to the point of linkage to the indenyl ring bears a substituent R43 or R43′,
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R35 and R35′ may not be the combinations of phenyl and 1-naphthyl or 1-naphthyl and phenyl when R33 is methyl or ethyl and R33′ is isopropyl,
R39 is a bridge:
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R40, R41 can be are identical or different, even when they have the same index, and are each a hydrogen atom, a halogen atom or a C1-C40 group such as a C1-C20-alkyl group, a C1-C10-fluoroalkyl group, a C1-C10-alkoxy group, a C6-C14-aryl group, a C6-C10-fluoroaryl group, a C6-C10-aryloxy group, a C2-C10-alkenyl group, a C7-C40-arylalkyl group, a C7-C40-alkylaryl group or a C8-C40-arylalkenyl group, where R40 and R41 may each, together with the atoms connecting them, form one or more rings, and x is an integer from zero to 18,
M12 is silicon, germanium or tin,
R39 may also link two units of the formula I with one another,
R43 is a hydrogen atom if R35 is different from R35′, or a C1-C10-alkyl radical, a C2-C10-alkenyl radical, a C6-C18-aryl radical, a C7-C20-arylalkyl radical, a C7-C20-alkylaryl radical, a C8-C20-arylalkenyl radical, where the hydrocarbon radicals may also be halogenated or partially halogenated by fluorine or chlorine, and be —N(R44)2, —P(R44)2, —SR44, —Si(R44)3, —N(R44)3+ or —P(R44)3+, where the radicals R44 are identical or different and are each a hydrogen atom or a hydrocarbon group which may be halogenated, linear, cyclic or branched, e.g. a C1-C10-alkyl group, a C2-C10-alkenyl group, a C6-C20-aryl group, a C7-C40-arylalkyl group, a C7-C40-alkylaryl group or a C8-C40-arylalkenyl group,
R43′ is hydrogen or is as defined for R43, R45, R45′, R46 and R46′ are each hydrogen or C4-C20-aryl, alkenyl or alkyl ring systems which may also be linked to the radicals R36, R36′ or R34, R34′.

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Transition metal compound, ligand system, catalyst system and the use of the latter for polymerisation and copolymerisation of olefins

Life of this patent

Transition metal compound, ligand system, catalyst system and the use of the latter for polymerisation and copolymerisation of olefins

Life of this patent

Abstract

Claims28