1
Toshifumi Morimoto, Takaaki Hattori, Noboru Ikegami, Hirofumi Nishibu, Toshiyuki Miyauchi, Kunimichi Kubo: Polyethylene composition. Nippon Petrochemicals Company, Yahwak & Associates, February 23, 1993: US05189106 (46 worldwide citation)

A polyethylene composition which has excellent flow characteristics and mechanical properties, especially low temperature mechanical properties as well as thermal stability, elasticity and workability for molding. The polyethylene composition comprises 20 to 80 wt. % of an ethylene-.alpha.-olefin co ...


2
Nobuyuki Kuroda, Tatsuo Horie, Kazuo Matsuura, Kunimichi Kubo, Mituji Miyoshi: Continuous process for the preparation of polyolefins having widely distributed molecular weights. Nippon Oil Company, Jordan and Hamburg, November 8, 1983: US04414369 (45 worldwide citation)

Polyolefins having a wide distribution of molecular weights are prepared in a plural stage process, by initially polymerizing the olefins in the presence of a solvent, hydrogen and a highly active Ziegler type catalyst under pressure, and beneath a gas phase containing an inert gas, to form in the f ...


3
Toshifumi Morimoto, Toshiyuki Miyauchi, Sumio Ikeda, Kunimichi Kubo, Narumi Ishikawa, Noboru Ikegami: Polyethylene composition. Nippon Petrochemicals Company, Birch Stewart Kolasch & Birch, November 9, 1993: US05260384 (40 worldwide citation)

A polyethylene composition which has a wide molecular weight distribution and excellent balance among melt elasticity, flow characteristics and mechanical properties, and which is suitable for use in producing large-scaled hollow plastics articles. The composition comprises a higher molecular weight ...


4
Akira Sano, Kunimichi Kubo, Kazuo Matsuura: Catalysts for polymerization of olefins. Nippon Oil, Finnegan Henderson Farabow Garrett & Dunner, July 18, 1989: US04849390 (20 worldwide citation)

A catalyst for polymerization of olefins is disclosed which comprises a titanium and/or vanadium compound supported on a silicon and/or aluminum oxide carrier. This carrier has peculiar characteristics including a specified proportion of highly spherical oxide particles, a selected average pore size ...


5
Kunimichi Kubo, Masahiro Niwa, Eiko Kobayashi, Mamoru Yoshikawa: Method for vapor phase polymerization of alpha-olefin. Nippon Petrochemicals Company, Fisher Christen & Sabol, July 15, 1997: US05648581 (14 worldwide citation)

A method for polymerizing or copolymerizing .alpha.-olefin in a vapor phase condition by supplying to a reactor a catalyst composed of a solid catalyst component containing at least titanium and/or vanadium as well as magnesium and an organic aluminum compound wherein the current due to the electric ...


6

7
Yoshihisa Yamaguchi, Shinjiro Suga, Masatoshi Morikawa, Kunimichi Kubo, Motokazu Watanabe, Yasuhiko Sano: Method for producing polyolefin. Nippon Petrochemicals Company, Yahwak & Associates, January 31, 1995: US05385991 (7 worldwide citation)

A process for producing polyolefin with a vapor-phase fluidized-bed reactor, wherein the reaction is started after filling the reactor with particles which contain moisture and/or molecular oxygen and can form a fluidized bed in order to prevent the formation of molten resin which is liable to occur ...


8
Akira Sano, Kunimichi Kubo, Kazuo Matsuura: Process for preparing polyolefins. Nippon Oil Company, Dilworth & Barrese, July 11, 1995: US05432236 (6 worldwide citation)

According to the present invention, in a vapor phase polymerization of olefins, there is provided an efficient polyolefin manufacturing process capable of preventing the formation of a sheet-like polymer and allowing an olefin polymerization reaction to be started stably. More particularly, there is ...


9
Kunimichi Kubo, Motokazu Watanabe, Mamoru Yoshikawa, Masatoshi Morikawa, Yoshihisa Yamaguchi: Process for feeding catalyst to fluidized bed for vapor phase polymerization. Nippon Petrochemicals Company, Yahwak & Associates, May 10, 1994: US05310833 (6 worldwide citation)

A process for feeding a powder catalyst with a gas intermittently to a high-pressure fluidized bed reactor for the vapor phase polymerization of olefin, wherein the cross section of a catalyst feed pipe is reduced midway through the pipe to thereby make continual catalyst feeding possible and preven ...


10
Kunimichi Kubo, Yasunosuke Miyazaki, Mamoru Yoshikawa, Mituji Miyoshi: Vapor phase polymerization apparatus for olefins. Nippon Oil Company, Austin R Miller, March 20, 1984: US04438073 (3 worldwide citation)

A horizontal agitation bed type vapor phase polymerization apparatus for olefins provided on its lower curved surface with plural cells each having an opening facing on the polymerization reaction system and further having small holes formed in its side wall portion for feeding a starting olefin gas ...