31
Kazuo Matuura, Masaomi Matsuzaki, Humiaki Oshimi, Nobuyuki Kuroda, Mituji Miyoshi: Process for preparing polyolefins. Nippon Oil Company, Cooper Dunham Clark Griffin & Moran, May 9, 1978: US04088812 (9 worldwide citation)

This invention discloses an improved catalyst for the polymerization or copolymerization of olefins, and a process for preparing polyolefins which comprises polymerizing or copolymerizing olefins using the said catalyst. According to the invention there is provided a process for preparing polyolefin ...


32
Arild Follestad: Multistep process for preparing polyolefins having high melt strength. Borealis Technology Oy, Nixon & Vanderhye P C, June 3, 2003: US06573343 (8 worldwide citation)

Olefin polymers are prepared in a plurality of polymerization stages, optionally in a plurality of polymerization reactors, in the presence of hydrogen and an olefin polymerization multisite catalyst, preferably a dualsite catalyst, having at least catalytic sites A and B, site A capable of yielding ...


33
Philip Howard, Peter James Maddox, Stephen Roy Partington: Polyolefin. BP Chemicals, Morgan & Finnegan, July 10, 2001: US06258912 (8 worldwide citation)

A process for preparing polyolefins having at least 0.01 long chain branches (LCB)/1000 carbon atoms along the polymer backbone as measured by flow activation and a molecular weight distribution greater than 2.5 comprises polymerization in the presence of a metallocene complex having the formula:


34
Mcnally John Paul: Catalyst compositions and process for preparing polyolefins.. Bp Chem Int, July 27, 1994: EP0608054-A2 (8 worldwide citation)

Catalyst compositions comprising metallocene complexes having Lewis base functionality may be used for the preparation of polyolefins. Preferred complexes are zirconium complexes in which the Lewis base functionality is provided by ether or thioether groups. The catalyst compositions may be supporte ...


35
Yoshio Tajima, Mituji Miyoshi, Shoji Sugita, Kiyoshi Kawabe, Kazuo Matsuura: Process for preparing polyolefins. Nippon Oil Company, Stevens Davis Miller & Mosher, June 25, 1985: US04525555 (8 worldwide citation)

Provided is a process for preparing a polyolefin, characterized by polymerizing at least one .alpha.-olefin in the presence of a catalyst which comprises the combination of:


36
Matsuura Kazuo, Shiraishi Takeichi, Okamoto Mitsuo: Process for preparing polyolefins.. Nippon Oil, September 16, 1987: EP0237293-A2 (8 worldwide citation)

A process for preparing a polyolefin by homopolymerizing or copolymerizing olefin or olefins using a catalyst consisting essentially of a solid catalyst component and an organometallic compound, said solid catalyst component being obtained by contacting the following components with one another: (i) ...


37

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Sano Akira, Shimizu Hiroyuki, Shiraisha Takeichi, Matsuura Kazuo, Yanahashi Sinichi: Process for preparing polyolefins.. Nippon Oil, February 20, 1991: EP0413469-A2 (7 worldwide citation)

Polyolefins having better particle properties are obtained by polymerizing olefins in the presence of a catalyst comprising a solid catalyst component and an organometallic compound, the said solid catalyst component being prepared by reacting the following components [I] and [II] and further reacti ...


39
Kazuo Matsuura, Masaomi Matsuzaki, Fumiaki Oshimi, Nobuyuki Kuroda, Mituji Miyoshi: Process for preparing polyolefins. Nippon Oil Company, February 28, 1978: US04076923 (7 worldwide citation)

According to the present invention, there is provided a process for preparing polyolefins which comprises polymerizing or copolymerizing olefins using as catalyst a component consisting of a solid carrier and a titanium compound and/or a vanadium compound supported thereon, and an organometallic com ...


40
Kuroda Nobuyuki, Nakamura Toru, Nomiyama Kazutosi, Nishiktani Yoshinori, Matsuura Kazuo, Miyoshi Mituji, Shikatani Yutaka: Process for preparing polyolefins. Nippon Oil, May 18, 1983: GB2108514-A (7 worldwide citation)

Olefin polymers are obtained in high yield and high bulk density and at a high polymerization activity when olefins are polymerized in the presence of a catalyst which comprises the combination of: [I] a solid substance obtained by the reaction of at least the following two components: (i) a magnesi ...