1
Stevens James C, Timmers Francis J, Wilson David R, Schmidt Gregory F, Nickias Peter N, Rosen Robert K, Knight George W, Lai Shih Yaw: Constrained geometry addition polymerization catalysts, processes for their preparation, precursors therefor, methods of use, and novel polymers formed therewith.. Dow Chemical, March 13, 1991: EP0416815-A2 (544 worldwide citation)

Metal coordination complexes comprising a metal of Group 3 (except Sc), 4-10 or the lanthanide series and a delocalized PI -bonded moiety have said moiety substituted with a constrain-inducing moiety which reduces the angle at the metal between the centroid of said PI -bonded moiety and at least one ...


2
Ewen John Alexander, Welborn Howard Curtis Jr: Process and catalyst for polyolefin density and molecular weight control.. Exxon Research Engineering Co, December 27, 1984: EP0129368-A1 (420 worldwide citation)

Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) and an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.


3
Lapointe Robert E, Stevens James C, Nickias Peter N, Mcadon Mark H: Homogeneous olefin polymerization catalyst by ligand abstraction with lewis acids.. Dow Chemical, December 30, 1992: EP0520732-A1 (292 worldwide citation)

Addition polymerization catalysts having a limiting charge separated structure corresponding to the formula: LMX XA, wherein: L is a derivative of a substituted delocalized PI -bonded group imparting a constrained geometry to the metal active site and containing up to 50 nonhydrogen atoms; M is a me ...


4
Turner Howard William: Catalysts, method of preparing these catalysts and method of using said catalysts.. Exxon Chemical Patents, August 3, 1988: EP0277004-A1 (273 worldwide citation)

A catalyst is prepared by combining a first compound consisting of a bis(cyclopentadienyl)metal compound having one of the following general formulae: 1. (A-Cp)MX1X2 2. (A-Cp)M @@@@'2 3. (A-Cp)ML 4. (Cp*)(Cp @@@X1 Wherein: M is a metal selected from the Group consisting of titanium, zirconium and ha ...


5
Turner Howard William, Hlatky Gregory George: Catalysts, method of preparing these catalysts, and polymerization processes wherein these catalysts are used.. Exxon Chemical Patents, August 3, 1988: EP0277003-A1 (238 worldwide citation)

A catalyst is prepared by combining a bis(cyclopentadienyl)zirconium compound which may be represented by one of the following general formulae: (A-Cp)MX1X2 (A-Cp)MX'1X'2 (A-Cp)ML; and (Cp*)(CpR)MX1 wherein: M is a metal selected from the Group consisting of titanium (Ti), zirconium (Zr) and hafnium ...


6
Parodi Sandro, Nocci Roberto, Giannini Umberto Dr, Barbe Pier Camillo Dr, Scata Umberto: Components and catalysts for the polymerization of olefins.. Montedison, February 17, 1982: EP0045977-A2 (229 worldwide citation)

Catalysts for the polymerization of alpha-olefins which comprise the reaction product of: a) an Al-alkyl compound; b) a silicon compound containing at least one Si-OR or Si-OCOR or Si-NR2 bond, R being a hydrocarbyl radical; c) a solid comprising as essential support, a Mg dihalide in active form an ...


7
Sacchetti Mario, Govoni Gabriele, Ciarrocchi Antonio: Components and catalysts for the polymerization of olefins.. Himont, October 31, 1990: EP0395083-A2 (146 worldwide citation)

Spherical catalyst components for the polymerization of olefins comprising a titanium compound and optionally an electron-donor supported on anhydrous magnesium chloride, characterized by a surface area between 20 and 250 m/g, a porosity between 0.25 and 0.5 cc/g, and an X-ray spectrum where the mag ...


8
Kueber Frank Dr, Bachmann Bernd Dr, Spaleck Walter Dr, Winter Andreas Dr, Rohrmann Juergen Dr: Metallocenes with arylsubstituted indenyl-derivatives as ligands, process for their preparation and their use as catalysts.. Hoechst, January 5, 1994: EP0576970-A1 (143 worldwide citation)

A very active catalyst system for the polymerisation or copolymerisation of olefins consists of a co-catalyst, preferably an aluminoxane or a supported aluminoxane, and a metallocene of the formula I in which, in the preferred form, M denotes Zr or Hf, R and R denote halogen or alkyl, R denotes alky ...


9
Winter Andreas Dr, Antberg Martin Dr, Spaleck Walter Dr, Rohrmann Juergen Dr, Dolle Volker Dr: 2-substituted bisindenyl-metallocenes, process for their preparation and their use as catalysts for the polymerization of olefins.. Hoechst, May 20, 1992: EP0485823-A1 (142 worldwide citation)

The metallocenes of the formula I according to the invention in which the substituents have the following preferred meanings: M is Zr or Hf, R and R are alkyl or halogen, R and R are hydrogen, R and R are alkyl or haloalkyl, -(CRR)m-R-(CRR)n- is a chain with one or more than one members in which R c ...


10
Kioka Mamoru, Kashiwa Norio: Finely divided aluminoxane, process for producing same and its use.. Mitsui Petrochemical, August 24, 1988: EP0279586-A2 (98 worldwide citation)

A finely divided aluminoxane comprising an aluminoxane represented by formula [1] or [11] wherein R denotes a hydrocarbon group having 1 to 10 carbon atoms and m denotes an integer of 2 to 50, an average particle size being 5 to 200 mu m and a specific surface area being 20 to 1000 mg/ a process for ...