Abstract: Diarylethylene metallocene derivatives, processes for preparing the same and pharmaceutical compositions which contain the derivatives are disclosed. The compounds of the invention can exhibit anti-tumor activity, and can be particularly useful in the treatment of estrogen-dependent cancers.

Abstract: Disclosed is a novel transition metal compound represented by the following formula: ##STR1## wherein M is a transition metal, X is halogen or the like, R.sup.1 is a hydrocarbon group or the like, R.sup.2 is an aryl group substituted with a halogenated hydrocarbon group, and Y is a divalent silicon-containing group or the like.Also disclosed are an olefin polymerization catalyst component comprising the transition metal compound, an olefin polymerization catalyst comprising the olefin polymerization catalyst component, and a process for olefin polymerization using the olefin polymerization catalyst.An olefin polymerization catalyst component having high polymerization activity can be formed from the transition metal compound. By the use of the olefin polymerization catalyst or the process for olefin polymerization, polyolefins having a high melting point and a high molecular weight can be prepared with high polymerization activity.

Abstract: A catalyst for the production of a vinyl polymer, which comprises: in combination, (A) a transition metal complex of the formula: ##STR1## wherein each of T.sup.1, T.sup.2, T.sup.3 and T.sup.4, independently of each other, is C.sub.1-20 -alkyl or C.sub.6-20 -aryl, M is a Group IV-VI transition metal and Q is C.sub.1-20 -alkoxy, (B) an aluminoxane or ionic compound having a non-coordinating anion and a cation and (C) a Lewis acid.Component (B) can be a combination of an aluminoxane and an ionic compound having a non-coordinating anion and a cation.

Abstract: The invention relates to an improved process which, starting from 2-cyclopenten-1-ones substituted in the 3-position, gives a high yields of 1,3-dialkylcyclopentadienes which can be directly metallated and reacted to give the corresponding 1,3-dialkylcyclopentadienyl-transition metal complexes.

Abstract: An (omega-alkenyl) (cyclopentacarbyl) metallocene compound is provided. Polymerization processes therewith are also provided.

Abstract: The present invention relates to a metallocene compound of the formula IR.sup.5.sub.n Cp.sup.1 Cp.sup.2 M.sup.1 R.sup.1 R.sup.2 (I)where Cp.sup.1 and Cp.sup.2 are, independently of one another, identical or different and are each an unsubstituted or substituted cyclopentadienyl group, n=zero or 1, R.sup.5 is a bridge, M.sup.1 is a metal of group IVb, Vb or VIb of the Periodic Table of the Elements, R.sup.1 and R.sup.2 are identical or different and are each a hydrogen atom or a C.sub.1 -C.sub.40 -group, wherein at least one of the two groups Cp.sup.1 and Cp.sup.2 is a substituted cyclopentadienyl group which bears at least one cyclic C.sub.3 -C.sub.30 -group containing at least one heteroatom in the ring, or which bears a fused-on C.sub.2 -C.sub.30 ring system containing at least one heteroatom in the ring.The metallocene compound can be used as a catalyst component for olefin polymerization.

Abstract: A process for preparing polynuclear metallocenes by reacting a metallocene in which one of the cyclopentadienyl-containing radicals has a substituent having olefinic or acetylenic unsaturation with a second metallocene having a metal which comes from groups IVb to VIb of the periodic table and a metal-hydride bond. The use of the resulting metallocenes in the polymerization of olefins is disclosed, including techniques for using such metallocenes to produce solid prepolymerized metallocene-containing catalyst systems suitable for use in the polymerization of olefins.

Abstract: In-situ process for preparing a bridged metallocene, which comprises reacting a substituted cyclopentadiene A, if desired an unsubstituted or substituted cyclopentadienyl compound B, at least one base, at least one bridging reagent and at least one metal component with one another.

Abstract: There is provided an organometallic compound comprising a metal M of Group 3 to 6 of the Periodic Table or the Lanthanide series and at least one (hetero)cyclohexadienyl ligand of the general formula (I)C.sub.5 AR.sub.nwherein A is an element chosen from Group 13 to 16 of the Periodic Table, R which can be connected to C or to A and which may form a bridge is independently hydrogen or an organic substituent which may contain one or more hetero-atoms and n is 3 plus the number of valencies of A. There is further provided the use of this compound as a catalyst, with a co-catalyst, in a process for the (co)oligomerisation or (co)polymerisation of olefinically unsaturated hydrocarbons.

Abstract: The invention relates to an organometallic compound of the formula I ##STR1## where M is chromium, molybdenum or tungsten, L is a cyclopentadienyl ligand, T is a bridge, A is a cyclopentadienyl ligand or an electron donor and R.sup.1 are, independently of one another, identical or different C.sub.1 -C.sub.20 -hydrocarbon radicals or hydrogen. The organometallic compound is suitable as a catalyst component for olefin polymerization.

Abstract: There is provided a method for making a monovalent inorganic anion-intercalated hydrotalcite-like material by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free, aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a monovalent inorganic anion, in its acid or soluble salt form, to make a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a bromide-, chloride-, nitrate- or vanadate-intercalated, hydrotalcite-like material.

Abstract: Metallocenes containing aryl-substituted indenyl derivatives as ligands, process for their preparation, and their use as catalysts.A very effective catalyst system for the polymerization or copolymerization of olefins comprises a cocatalyst, preferably an aluminoxane or a supported aluminoxane, and a metallocene of the formula I ##STR1## in which, in the preferred form, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are halogen or alkyl, R.sup.3 is alkyl, R.sup.4 to R.sup.12 are alkyl or hydrogen and R.sup.13 is a (substituted) alkylene or heteroatom bridge.The metallocenes, in particular the zirconocenes, produce polymers of very high molecular weight, in the case of prochiral monomers polymers of very high molecular weight, very high stereotacticity and very high melting point, at high catalyst activities in the industrially particularly interesting temperature range between 50.degree. and 80.degree. C. In addition, reactor deposits are avoided by means of supported catalyst systems.

Abstract: The present invention relates to a metallocene compound of the formula I which is suitable for olefin polymerization ##STR1## where M is a metal of group IVb, Vb or VIb of the Periodic Table.X are each a hydrogen atom, a halogen atom or a C.sub.1 -C.sub.40 -radical OR.sup.4 or NR.sup.4.sub.2, where R.sup.4 are a C.sub.1 -C.sub.20 hydrocarbon radicalm and p are 1, 2 or 3,n is 1 or 2,L each a .pi. ligand which coordinates to the central atom M,M.sup.2 are each a silicon atom, a germanium atom or a tin atom,R.sup.1 are a C.sub.1 -C.sub.20 -radical,R.sup.2 are a C.sub.1 -C.sub.20 -radical or a .pi. ligand which coordinates to the central atom M,A are each a bidentate C.sub.1 -C.sub.40 -hydrocarbon group,Z are each a boron atom, a silicon atom, a germanium atom or a tin atom,R.sup.3 are each a hydrogen atom or a C.sub.1 -C.sub.20 -radical,o is zero, 1 or 2,Hal are each a halogen atom, andwhere n is 1 if R.sup.2 is a .pi. ligand which coordinates to the central atom M and n is 2 if R.sup.2 is a C.sub.1 -C.sub.

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: There is provided a method for making a polyvalent inorganic anion-intercalated hydrotalcite-like material by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free, aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a polyvalent inorganic anion, in its acid, acid salt or ammonium salt form, to make a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a borate- metatungstate- and paramolybdate-intercalated hydrotalcite-like material.

Abstract: There is provided a method for making a divalent inorganic anion-intercalated hydrotalcite-like material by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a divalent inorganic anion, in its acid, acid salt or ammonium salt form, to make a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a sulfate- and metavanadate-intercalated hydrotalcite-like material.

Abstract: There is provided an improved method for making synthetic hydrotalcite by first reacting a divalent metal compound with a trivalent metal oxide powder in a carboxylic acid-free, aqueous solution or suspension to form an intermediate. This intermediate is then contacted with an anion source such as carbon dioxide; a carbonate-containing compound; an acid or an ammonium salt to form a layered double hydroxide having the formula:A.sub.1-x B.sub.x (OH).sub.2 C.sub.z.mH.sub.2 O, where A represents a divalent metal cation, B represents a trivalent metal cation, C represents a mono- to polyvalent anion, and x, z and m satisfy the following conditions: 0.09<x<0.67; z=x/n, where n=the charge on the anion; and 2>m>0.5. Said layered double hydroxide is typically separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means.

Abstract: There is provided a method for making monovalent organic anion-intercalated hydrotalcite-like materials by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free, aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a monovalent organic anion to form a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a stearate-, acetate- or benzoate-intercalated hydrotalcite-like material.

Abstract: There is provided an improved method for making synthetic hydrotalcite by first reacting powdered magnesium oxide with a high surface area, transition alumina in a solution or suspension to form a meixnerite-like intermediate. This intermediate is then contacted with an anion source such as an acid, and most preferably carbon dioxide, to form the layered double hydroxide which is separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means. On a preferred basis, the transition alumina combined with activated magnesia consists essentially of an rehydratable alumina powder having a surface area of 100 m.sup.2 /g or greater. To make related double hydroxide compounds, still other reactants such as bromides, chlorides, boric acids, or salts thereof, may be substituted for the carbon dioxide gas fed into this suspension.

Abstract: A process to produce an ethylene-bridged-metallocene-transition-metal compound that has an omega-alkenyl substitution on said ethylene bridge is provided. Said process comprises: contacting a diolefin compound with a peracid compound to form an omega-alkenyl oxirane compound; contacting said omega-alkenyl oxirane compound with an organometal compound to form an organo-omega-alkenyl-alcohol compound; contacting said organo-omega-alkenyl-alcohol compound with an organosulfur compound to form an organo-omega-alkenyl-organosulfur ester compound; contacting said organo-omega-alkenyl-organosulfur ester compound with an organometal to form an orgaomega-alkenyl-organo compound; contacting said organo-omega-alkenyl-organo compound with a transition metal compound to form a organo-omega-alkenyl-organo-transition compound. Additionally, processes to polymerize olefins using these compounds is provided.

Abstract: Bridged metallocene compounds are produced by a process of promising commercial utility for plant-sized operations. The overall process involves the direct conversion of benzoindanones to benzoindanols which, without isolation, are converted to benzoindenes. Thereupon the benzoindenes are bridged by deprotonating the benzoindenes with a strong base such as butyllithium and reacting the resultant deprotonated product with a suitable silicon-, germanium- or tin-containing bridging reactant such as dichlorodimethylsilane. The resultant bridged product is deprotonated with a strong base such as butyllithium and reacted with a suitable Group IV, V, or VI metal-containing reactant such as ZrCl.sub.4 to provide a silicon-, germanium- or tin-bridged Group IV, V, or VI metal complex, such as a dihydrocarbylsilyl-bridged zirconocene complex.

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: A process for preparing transition metal complexes containing disubstituted cyclopentadienyl ligands of the general formula (1) ##STR1## in which a monomeric, monosubstituted cyclopentadiene is reacted using a mixture of an alkali metal oxide or hydroxide and an alkaline earth metal oxide or hydroxide as a metallating agent in polyoxyalkylene polyethers as the reaction medium with organic halides or pseudohalides to give the intermediate disubstituted cyclopentadiene which is, in situ, metallated and reacted with a transition metal halide to give the end product.

Abstract: A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b are identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms, or R.sup.a and R.sup.b, together with the atoms connecting them, can form a ring, at a temperature of from -60.degree. to 200.degree. C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst formed from a metallocene in the meso-form or a meso:rac mixture, with meso:rac>1:99, as transition-metal compound and a cocatalyst, wherein the metallocene is a compound of the formula I, ##STR1## in which M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are identical or different and are methyl or chlorine, R.sup.3 and R.sup.6 are identical or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl, R.sup.4 and R.sup.5 are hydrogen or as defined for R.sup.3 and R.sup.

Abstract: Pentafluorophenylmagnesium halides are prepared by a Grignard exchange reaction of hydrocarbylmagnesium halide with pentafluorochlorobenzene. The pentafluorophenylmagnesium halides are converted to pentafluorophenyl metal or metalloid derivatives by reacting them with metal or metalloid halides such as BF.sub.3.

Abstract: Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or absence of an organoaluminum compound. A hydrogen partial pressure of a gas phase in the reaction vessel, said gas phase being formed of the propylene and hydrogen, is maintained at 10% or higher. The solid catalyst is formed of a transition metal compound or a reaction product between the transition metal compound and an organometallic compound, an aluminoxane and a fine particulate carrier. Also described herein is a heating-roll fixing type toner composition composed essentially of a binder resin or a binder resin composition, a colorant and, as a releasing agent, the wax.

Abstract: The present invention relates to an unbridged metallocene compound which is suitable for olefin polymerization.

Abstract: Novel onium borates of an element of Groups 15 to 17 of the Periodic Table, or borates of an organometallic complex of an element of Groups 4 to 10 of the Periodic Table, well suited for the photochemical/electron beam cationic initiation of polymerization/crosslinking, the anionic borate moiety of which having the formula:[BX.sub.a R.sub.b ].sup.-in which a and b are integers ranging from 0 to 4 and a+b=4; the symbols X are each a halogen atom when a ranges up to 3 and an OH functional group when a ranges up to 2; and the symbols R, which may be identical or different, are each a phenyl radical substituted by at least one element or electron-withdrawing substituent or by at least two halogen atoms, or an aryl radical containing at least two aromatic ring members, or such aryl radical bearing at least one electron-withdrawing substituent.

Abstract: Double bound metallocenes, i.e. metallocenes having a cyclopentadienyl-containing radical that is bound to a transition metal both by a pi bond and by a sigma carbon bond of a substituent of that same cyclopentadienyl-containing radical can be prepared by reducing metallocenes having a cyclopentadienyl-containing radical having at least one an unsaturated substituent. Also a process for producing polymers comprising contacting at least one olefinic monomer under suitable polymerization conditions with such double bound metallocenes.

Abstract: The invention relates to an indenyl compound of the general formulaR'Ind--M--(Cp)Q.sub.kin which the symbols have the following meanings:Ind: an indenyl groupR': a substituent, other than hydrogen, to the Ind group,Cp: a cyclopentadienyl groupM: a transition metal from group 3, 4, 5 or 6 of the Periodic System of ElementsQ: a ligand to Mand k is an integer linked to the valence of M.The invention is characterized in that the R' group is bound to the Ind group at the 2-position. The indenyl compound is a catalyst component for the polymerization of olefins.The invention also relates to polymers obtainable with such indenyl compounds.

Abstract: Metallocenes are prepared by a process in which a metal salt is reacted with at least one alkali metal and with an unsaturated, cyclic hydrocarbon in the presence of a solvent in one reaction step.

Abstract: Molybdenum and tungsten compounds that are useful as catalyst precursors in the metathesis of olefins have the general formula:M(Y) (OR.sup.2).sub.x (R.sup.3).sub.y (X).sub.z L.sub.swherein M is tungsten or molybdenum; Y is oxygen or NR.sup.1 ; R.sup.1, R.sup.2, and R.sup.3 are the same or different and are selected from alkyl, cycloalkyl, cycloalkenyl, polycycloalkyl, polycycloalkenyl, haloalkyl, haloaralkyl, substituted or unsubstituted aralkyl and aryl groups, and silicon-containing analogs thereof; L is a Lewis base; X is halogen; s is 0 or 1; x+y+z=4, and y.gtoreq.1, provided that when x is 2 or more, two OR.sup.2 groups can be replaced by a chelating ligand (OR.sup.2).sub.2.These compounds can be used for the metathesis of olefins in neat metathesizable olefin, as well as in solution, and require only the input of energy to be converted to active catalysts.

Abstract: Compounds useful as catalyst components for olefin polymerization. The compounds comprise derivatives of cyclopentadienyl complexes of the ZR or HF.

Abstract: Unbridged fluorenyl containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition, polymers resulting from such polymerizations are disclosed.

Abstract: The invention relates to a new improved process for preparing bridged stereorigid metallocenes via organomagnesium and organotin compounds.

Abstract: The present invention relates to a polynuclear metallocene compound of the formula I ##STR1## a process for their preparation and their use as a catalyst for olefin polymerization.

Abstract: There is provided a method for making a divalent or polyvalent organic anion-intercalated hydrotalcite-like materials by first reacting a magnesium-containing powder and a transition alumina powder in an aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a dicarboxylate or polycarboxylate anion to form a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include an oxalate-, succinate- or terephthalate-intercalated hydrotalcite-like material.

Abstract: Fluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition, polymers resulting from such polymerizations are disclosed.

Abstract: A process for making a metallocene, said process comprising the steps of (a) reacting an alkylsubstituted cyclopentadiene ligand, which contains a mixture of endo- and exo-isomers, with up to about a 10% excess over a stoichiometric amount of a deprotonation agent based on the amount of endo-isomers, so as to form a salt of said endo-isomers, (b) reacting the endo-isomer salt with a transition or actinide metal compound so as to form said metallocene and (c) optionally separating said exo-isomers and trace amounts of unreacted endo-isomers from said metallocene by distillation.

Abstract: Novel onium borates of an element of Groups 15 to 17 of the Periodic Table, or borates of an organometallic complex of an element of Groups 4 to 10 of the Periodic Table, well suited for the photochemical/electron beam cationic initiation of polymerization/crosslinking, the anionic borate moiety of which having the formula:[BX.sub.a R.sub.b ].sup.-which a and b are integers ranging from 0 to 4 and a+b=4; the symbols X are each a halogen atom when ranges up to 3 and an OH functional group when a ranges up to 2; and the symbols R, which may be identical or different, are each a phenyl radical substituted by at least one element or electron-withdrawing substituent or by at least two halogen atoms, or an aryl radical containing at least two aromatic ring members, or such aryl radical bearing at least one electron-withdrawing substituent.

Abstract: The invention relates to a metallocene compound of the formula I ##STR1## where the two indenyl ligands have substitution patterns different from one another. The metallocene compound can be used as catalyst component for olefin polymerization.

Abstract: A catalyst component for use in the polymerization of .alpha.-olefins, comprising a compound represented by the following general formula I!: ##STR1## wherein R.sup.1 s represent a hydrogen atom, a C.sub.1-6 hydrocarbon group or a C.sub.1-12 hydrocarbon group containing silicon; each of R.sup.2 and R.sup.3 which forms the condensed ring represents a divalent C.sub.3-20 saturated or unsaturated hydrocarbon group, provided that at least one of R.sup.2 and R.sup.3 forms a ring condensed with the cyclopentadiene which is a seven- to twelve-membered ring having an unsaturated bond inherent in R.sup.2 or R.sup.3 ; Q represents a C.sub.1-20 divalent hydrocarbon group, a silylene group, a silylene group with a C.sub.1-20 hydrocarbon group, a germylene group, or a germylene group with a C.sub.1-20 hydrocarbon group; X and Y represent H, a halogen, a C.sub.1-20 hydrocarbon group, or a C.sub.

Abstract: Transition metal compounds of a crystalline-like structure are provided having unique electrical properties. The compounds comprising nickel have been shown to have ferromagnetic behavior which is induced or enhanced by exposure to electromagnetic radiation and heat. The compounds are identified by characteristic peaks in the infrared spectra and X-ray powder diffraction spectra. The spectra suggest the compounds have a planar structure of the empirical formula M(X).sub.(4-Y)/X M.sub.C (Y)C.sub.4 or a three-dimensional structure of empirical formula M(X).sub.(6-Y)/X M.sub.C (Y)C.sub.6, wherein M.sub.C (Y) is the transition metal, with Y being its ionic state, and M(X) is the counter cation with X being its ionic state.

Abstract: Molybdenum and tungsten compounds that are useful as catalyst precursors in the metathesis of olefins have the general formula:M(Y)(OR.sup.2).sub.x (R.sup.3).sub.y (X).sub.z L.sub.swherein M is tungsten or molybdenum; Y is oxygen or NR.sup.1 ; R.sup.1, R.sup.2, and R.sup.3 are the same or different and are selected from alkyl, cycloalkyl, cycloalkenyl, polycycloalkyl, polycycloalkenyl, haloalkyl, haloaralkyl, substituted or unsubstituted aralkyl and aryl groups, and silicon-containing analogs thereof; L is a Lewis base; X is halogen; s is 0 or 1; x+y+z=4, and y.gtoreq.1, provided that when x is 2 or more, two OR.sup.2 groups can be replaced by a chelating ligand (OR.sup.2).sub.2.These compounds can be used for the metathesis of olefins in neat metathesizable olefin, as well as in solution, and require only the input of energy to be converted to active catalysts.

Abstract: A catalyst component for use in the polymerization of .alpha.-olefins, comprising a compound represented by the following general formula [I]: ##STR1## wherein R.sup.1 s represent a hydrogen atom, a C.sub.1-6 hydrocarbon group or a C.sub.1-12 hydrocarbon group containing silicon; each of R.sup.2 and R.sup.3 independently represents a divalent group selected from the group consisting of a hydrocarbon group having 3 to 30 carbon atoms and a silicon-containing hydrocarbon group having 1 to 30 carbon atoms and 1 to 6 silicon atoms, provided that at least one of R.sup.2 and R.sup.3 is said silicon-containing hydrocarbon group; Q represents a C.sub.1-20 divalent hydrocarbon group, a silylene group, a silylene group with a C.sub.1-20 hydrocarbon group, a germylene group, or a germylene group with a C.sub.1-20 hydrocarbon group; X and Y represent H, a halogen, a C.sub.1-20 hydrocarbon group, or a C.sub.

Abstract: Metallocenes which are useful as olefin polymerization catalysts are prepared by reacting a compound of a metal of the group 4 to 10, lanthanide or actinide series of the Periodic Table of the Elements with a magnesium halide salt of a cyclopentadienyl containing ligand in the presence of an organic halide so as to form the metallocene while simultaneously raising the oxidation state of the metal.

Abstract: Metallocenes having benzo-fused indenyl derivatives as ligands, processes for their preparation and their use as catalysts A very effective catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are halogen or alkyl, R.sup.3 is alkyl, R.sup.4 to R.sup.10 are alkyl or hydrogen and R.sup.11 is a (substituted) alkylene or heteroatom bridge.

Abstract: Benzofluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition, polymers resulting from such polymerizations are disclosed.

Abstract: Fluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition, polymers resulting from such polymerizations are disclosed.

Abstract: This invention is for a metallocene catalyst component useful in preparing isotactic polyolefins, a catalyst system using this component and a process for polymerizing olefins using the catalyst component. The catalyst component consists of a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a different manner from the other ring. One of the cyclopentadienyl ligands contains a bulky group in one and only one distal position and the other cyclopentadienyl ligand has bilateral or pseudobilateral symmetry. There is a steric difference between the two Cp rings.The catalyst component is a stereorigid metallocene described by the formula:R" (CpR.sub.n)(CpR'.sub.m)MeQ.sub.kwherein each Cp is a cyclopentadienyl or substituted cyclopentadienyl ring; each R.sub.n and R'.sub.