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Sheldon Kavesh, Dusan C Prevorsek: High tenacity, high modulus polyethylene and polypropylene fibers and intermediates therefore. Allied Corporation, Alan M Doernberg, Gerhard H Fuchs, Roy H Massengill, November 1, 1983: US04413110 (303 worldwide citation)

Solutions of ultrahigh molecular weight polymers such as polyethylene in a relatively non-volatile solvent are extruded through an aperture at constant concentration through the aperture and cooled to form a first gel of indefinite length. The first gels are extracted with a volatile solvent to form ...


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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 ...


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Ewen John A, Elder Michael J: Metallocene catalysts with lewis acids and aluminum alkyls.. Fina Technology, May 15, 1991: EP0427697-A2 (205 worldwide citation)

This invention is for a catalyst system comprising a neutral metallocene compound, an aluminum alkyl and a Lewis acid. The Lewis acid must be of sufficient acidity to ionize a neutral metallocene compound to form a cationic metallocene catalyst. The ligands of the Lewis acid should not be reactive w ...


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Harlin Ali, Alastalo Kauno, Korhonen Esa, Kivelae Jouni: Process and apparatus for preparing propylene homopolymers and copolymers. Borealis, December 30, 1998: EP0887379-A1 (194 worldwide citation)

Described herein is a process and an apparatus for preparing propylene homopolymers and copolymers, which comprises polymerizing propylene optionally with comonomers in the presence of a catalyst at elevated temperature and pressure in at least one slurry reactor and at least one gas phase reactor, ...


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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.


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Robert M Waymouth, Geoffrey W Coates, Elisabeth M Hauptman: Thermoplastic elastomeric olefin polymers, method of production and catalysts therefor. Leland Stanford Jr University, Oblon Spivak McClelland Maier & Neustadt P C, January 14, 1997: US05594080 (152 worldwide citation)

This invention is directed to novel catalysts the structure and activity of which can be controlled to produce a wide range of alpha olefin polymers and co-polymers, and preferably for the production of stereoblock poly alpha olefins comprising a wide range of preselected amorphous and crystalline s ...


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Morini Giampiero, Albizzati Enrico, Balbontin Giulio, Baruzzi Giovanni, Cristofori Antonio: Components and catalysts for the polymerization of olefins. Montell North America, August 28, 1996: EP0728769-A1 (150 worldwide citation)

Solid catalyst components and catalysts therefrom, the catalysts comprising the reaction product of: i. a solid catalyst component containing an internal donor; ii. an Al-alkyl compound, and optionally iii. an external donor; the internal donor and/or the external donor being cyclopolyenic 1,3-dieth ...


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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 ...


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C A Ayres, John N Scott Jr, Fred T Sherk: Loop reactor settling leg system for separation of solid polymers and liquid diluent. Phillips Petroleum Company, J E Phillips, September 23, 1986: US04613484 (130 worldwide citation)

Method and apparatus for the separation of solid particulate polymer from liquid diluent comprising the use of one or more accumulator legs to which diluent is supplied, and separated diluent is recycled to the polymerization process.


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