Junichi Imuta, Takashi Ueda, Yoshihisa Kiso, Akira Mizuno, Masaaki Kawasaki, Mikio Hashimoto: Propylene polymer, propylene copolymer, and propylene elastomer prepared using novel bridged indenyl containing metallocenes. Mitsui Petrochemical, Sherman and Shalloway, April 2, 1996: US05504172 (231 worldwide citation)

The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R.sup.1 and R.sup.2 are each a hydrogen atom, a hydrocarbon group or the like; R.sup.3 is an alkyl group of 2 to 20 carbon atoms; R.sup.4 is an alkyl group of 2 ...

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 ...

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 ...


B Joseph Scheve, John W Mayfield, Anthony J DeNicola Jr: High melt strength, propylene polymer, process for making it, and use thereof. HIMONT Incorporated, April 10, 1990: US04916198 (111 worldwide citation)

Disclosed is a normally solid, high molecular weight, gel-free, amorphous to predominantly crystalline, propylene polymer characterized by high melt strength due to strain hardening which is believed to be caused by free-end long chain branches of the molecular chains forming the polymer.

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 ...

Weickert Gunter, Gustafsson Bill Benjamin Rudolf: Process for the catalytic polymerization of olefins, a reactor system, its use in the process, the polyolefins obtained and their use. Borealis Technology Oy, Weickert Gunter, Gustafsson Bill Benjamin Rudolf, PRINS Hendrik Willem, December 23, 2004: WO/2004/111095 (98 worldwide citation)

The present invention relates to a process for the catalytic polymerization of olefins comprising the steps of; i) a first polymerization in a first reactor, wherein olefins are polymerized with a particulate catalyst, hydrogen and optional a comonomer in a fluidum of an inert low boiling hydrocarbo ...

Ewen John A, Reddy B R, Elder Michael J: Method for controlling the melting points and molecular weights of syndiotactic polyolefins using metallocene catalyst systems.. Fina Technology, January 5, 1994: EP0577581-A2 (96 worldwide citation)

This invention is for a method for varying the melting points and molecular weights of syndiotactic polyolefins by using metallocene catalysts with substituents on the aryl rings of a fluorene ligand in certain positions. Electron donating substituents, for example, dialkylamino, halogen, and alkoxy ...

Weiqing Weng, Armen Dekmezian, Eric J Markel, Avinash Gadkari, David L Peters: Vinyl-containing stereospecific polypropylene macromers. Exxon Chemical Patents, Brent M Peebles, W G Muller, September 12, 2000: US06117962 (90 worldwide citation)

Stereospecific polypropylene macromers having a high percentage of vinyl terminal bonds and a method for preparing them are provided. The stereospecific polypropylene macromers have number average molecular weights (M.sub.n) of about 2,000 Daltons to about 50,000 Daltons, and the total number of vin ...