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 ...

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.

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 ...

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 ...

Canich Jo Ann Marie: Olefin polymerization catalysts.. Exxon Chemical Patents, April 3, 1991: EP0420436-A1 (192 worldwide citation)

The invention is a catalyst system including a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.

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 ...

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 ...

Devore David D: Preparation of addition polymerization catalysts.. Dow Chemical, November 25, 1992: EP0514828-A1 (121 worldwide citation)

Metal complexes useful as components of addition polymerization catalysts are prepared by oxidizing Group 3-10 or Lanthanide metal containing complexes using an organic halide oxidizing agent.

Winter Andreas Dr, Spaleck Walter Dr: Process for preparing 1-olefinpolymers.. Hoechst, February 8, 1989: EP0302424-A1 (108 worldwide citation)

In Ziegler catalysts based on a metallocene as the transition-metal component and on an aluminoxane as activator, preactivation of the metallocene by means of the aluminoxane results in a significant increase in the activity of the catalyst system. Furthermore, use of a catalyst system of this type ...

Brekner Michael Joachim Dr, Rohrmann Juergen Dr, Spaleck Walter Dr, Antberg Martin Dr: Process for preparing cycloolefin polymers.. Hoechst, January 16, 1991: EP0407870-A2 (105 worldwide citation)

Polymerisate von polycyclischen Olefinen der Formeln I bis IV mit einer Viskositätszahl grösser 20 cm /g und einer Glastemperatur oberhalb 100 DEG C erhält man ohne Ringöffnung mit einer hohen Polymerisationsgeschwindigkeit bei technisch günstigen Polymerisationstemperaturen mittels eines Katalysato ...