Abstract: The invention relates to a method for producing special transition metal compounds, to novel transition metal compounds and to their use for the polymerization of olefins.

Abstract: A process for preparing salt-like compounds of the formula (1), (C6R115)3MR2??(I) where R1 are identical or different and are each a hydrogen atom, a halogen atom, C1-C20-alkyl, C6-C14-aryl, C1-C10-alkoxy, C2-C10-alkenyl, C7-C20-arylalkyl, C7-C20-alkylaryl, C6-C10-aryloxy, C1-C10-haloalkyl, C6-C10-haloaryl, C2-C10-alkynyl or C3-C20-alkylsilyl, M is an element of main group III of the Periodic Table of the Elements, and R2 is a substituted or unsubstituted heterocycle, and the use of such compounds in catalyst systems for preparing polyolefins.

Abstract: The present invention provides new coordinative catalysts for the polymerization of alkylene oxides.

Abstract: A salt-like chemical compound of the formula (I),

Abstract: The present invention provides new coordinative catalysts for the polymerization of alkylene oxides.

Abstract: The invention relates to a method for producing special transition metal compounds, to novel transition metal compounds and to their use for the polymerization of olefins.

Abstract: A salt-like chemical compound of the formula (I),

Abstract: The invention relates to a catalyst system composed of metallocenes comprising substituents containing fluorine, a method for producing said system and its use for the polymerization of olefins.

Abstract: 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.

Abstract: The present invention relates to a process to prepare an olefin using a transition metal compound of the formula I as a catalyst component where M1 is a metal of group IIIb, IVb or Vb of the Periodic Table of the Elements, R1, R2, R3 and R4 are identical or different and are each a hydrogen atom or a substituent, R5 are identical or different and are a substituent, Y are identical or different and are each a hydrogen atom, a C1-C40-hydrocarbon-containing group, an OH group, a halogen atom or an NR52 group, where R5 are identical or different and are each a halogen atom, a C1-C10-alkyl group or a C6-C10-aryl group, k is an integer which corresponds to the valence of the transition metal atom M1 minus two and if Y is a butadiene unit, k is 1, A is a bridge.

Abstract: The present invention relates to a transition metal compound of the formula I ##STR1## where M.sup.1 is a metal of group IIIb, IVb or Vb of the Periodic Table of the Elements,R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and are each a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.40 -hydrocarbon-containing group, an --SiR.sup.5.sub.3, --NR.sup.5.sub.2, --Si(OR.sup.5).sub.3, --Si(SR.sup.5).sub.3 or --PR.sup.5.sub.2 radical, where R.sup.5 are identical or different and are each a halogen atom, a C.sub.1 -C.sub.10 -alkyl group or a C.sub.6 -C.sub.10 -aryl group, or two or more radicals R.sup.1, R.sup.2, R.sup.3 or R.sup.4 together with the atoms connecting them form a ring system,Y are identical or different and are each a hydrogen atom, a C.sub.1 -C.sub.40 -hydrocarbon-containing group, an OH group, a halogen atom or an NR.sup.5.sub.2 group,k is an integer which corresponds to the valence of the transition metal atom M.sup.1 minus two and if Y is a butadiene unit, k is 1,A is a bridge,R.

Abstract: The present invention relates to a transition metal compound of the formula I ##STR1## where M.sup.1 is a transition metal of group IIIb, IVb, Vb or VIb of the Periodic Table of the Elements,Y are identical or different and are each a hydrogen atom, an OH group, a halogen atom, a C.sub.1 -C.sub.40 -hydrocarbon-containing group or an NR.sup.15.sub.2 group, where R.sup.15 is a halogen atom, a C.sub.1 -C.sub.10 -alkyl group or a C.sub.6 -C.sub.10 -aryl group, k is an integer which corresponds to the valence of the transition metal atom M.sup.1 minus two and, if Y is a butadiene unit, k is 1,R.sup.1, R.sup.2, R.sup.3, R.sup.7, R.sup.8 and R.sup.9 are identical or different and are each a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.40 -hydrocarbon-containing group, an --SiR.sup.15.sub.3, --NR.sup.15.sub.2, --SiOR.sup.15.sub.3, --SiSR.sup.15.sub.3 or --PR.sup.15.sub.2 radical, where R.sup.15 is a halogen atom, a C.sub.1 -C.sub.10 -alkyl group or a C.sub.6 -C.sub.

Abstract: The present invention relates to zwitterionic neutral transition metal compounds. The compounds are suitable as catalyst components for the polymerization of olefins.

Abstract: The present invention relates to a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups which are bonded to one another via a monocyclic or polycyclic ring system, where at least one cyclopentadienyl group is fused to the monocyclic or polycyclic ring system, and to a process for the preparation of a cycloolefin copolymer. The cycloolefin copolymers obtained in this way have high tear strengths and are suitable for the production of extrusion parts and injection moldings.

Abstract: The present invention relates to a transition metal compound of the formula IL.sub.n (X.sub.m A.sub.t R.sup.1.sub.q).sub.s MY.sub.r (I),whereM is a metal atom of group IIIb, IVb, Vb or VIb of the Periodic Table of the Elements,L are identical or different and are each a .pi.-ligand or an electron donor, n is 1, 2, 3 or 4,Y are identical or different and are each a hydrogen atom, a halogen atom or an 1-dentate C.sub.1 -C.sub.40 -group, where l is 1, 2, 3 or 4, r is 0, 1, 2, 3, 4 or 5,and at least one of the radicals L bears at least one group X.sub.m A.sub.t R.sup.1.sub.q, whereX are identical or different and are each a hetero atom or a C.sub.1 -C.sub.40 -group, m is 0 or 1,A is an atom of group IIIa, Va or VIa of the Periodic Table of the Elements, t is 1,R.sup.1 are identical or different and are each a C.sub.1 -C.sub.40 -group, q is 1, 2, 3, 4 or 5 and s is an integer from 1 to 20.The transition metal compound of the invention is suitable as a catalyst component for olefin polymerization.

Abstract: The present invention relates to zwitterionic neutral transition metal compounds. The compounds are suitable as catalyst components for the polymerization of olefins.

Abstract: The present invention relates to a stereorigid transition metal compound having as ligands a cyclopentadienyl group and a substituted or unsubstituted heteroatom which are connected to one another via a monocyclic or polycyclic ring system, with the cyclopentadienyl group being fused onto the monocyclic or polycyclic ring system. The transition metal compound of the invention is suitable as a catalyst component for olefin polymerization.

Abstract: The present invention relates to a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups which are bonded to one another via a monocyclic or polycyclic ring system, where at least one cyclopentadienyl group is fused to the monocyclic or polycyclic ring system, and to a process for the preparation of a cycloolefin copolymer. The cycloolefin copolymers obtained in this way have high tear strengths and are suitable for the production of extrusion parts and injection moldings.

Abstract: The present invention relates to a process for the preparation of a polyolefin by polymerization of at least one olefin in the presence of a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups bonded to one another via a monocyclic or polycyclic ring system, in which at least one cyclopentadienyl group is fused to the monocyclic or polycyclic ring system.

Abstract: The present invention relates to zwitterionic neutral transition metal compounds. The compounds are suitable as catalyst components for the polymerization of olefins.