1
Ryuichi Sugimoto, Tadashi Asanuma, Tutomu Iwatani, Katsumi Takeuchi, Osamu Uchida: Metallocene-catalyzed olefin polymerization in the absence of aluminoxane. Mitsui Chemicals, Burns Doane Swecker & Mathis L, September 19, 2000: US06121394 (28 worldwide citation)

The present invention is directed to a method for polymerizing an .alpha.-olefin characterized by using a catalyst system which is obtained by reacting a halogenated metallocene compound with an organometallic compound, and then bringing the resultant reaction product into contact with a compound wh ...


2
Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tutomu Iwatani, Katsumi Takeuchi: Polypropylene resin compositions of high syndiotacticity and preparation process thereof. Mitsui Toatsu Chemicals, Burns Doane Swecker & Mathis, May 18, 1993: US05212247 (16 worldwide citation)

Disclosed herein is a polypropylene resin composition of a high syndiotacticity comprising a substantial homopolymer of propylene, in which the ratio of the intensity of the peak attributable to the syndiotactic pentad bonds to the sum of the intensities of all the peaks attributable to the methyl g ...


3
Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tateyo Sasaki, Osamu Uchida, Tutomu Iwatani, Shigeru Kimura, Takeo Inoue: Syndiotactic polypropylene copolymer and extruded polypropylene articles. Mitsui Chemicals, Burns Doane Swecker & Mathis L, July 3, 2001: US06255425 (13 worldwide citation)

A syndiotactic polypropylene copolymer is disclosed which comprises 70 to 99.9 mole % of propylene and 0.1 to 30 mole % of an olefin other than propylene; in the


4
Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tutomu Iwatani, Katsumi Takeuchi: Polypropylene resin compositions of high syndiotacticity and preparation process thereof. Mitsui Toatsu Chemicals Incorporated, Burns Doane Swecker & Mathis, May 24, 1994: US05314956 (10 worldwide citation)

Disclosed herein is a polypropylene resin composition of a high syndiotacticity comprising a substantial homopolymer of propylene, in which the ratio of the intensity of the peak attributable to the syndiotactic pentad bonds to the sum of the intensities of all the peaks attributable to the methyl g ...


5
Tetsunosuke Shiomura, Tadashi Asanuma, Masashiro Kouno, Norihide Inoue, Satoshi Fukushima, Yoshiho Sonobe, Kazumi Mizutani, Tutomu Iwatani, Ryuichi Sugimoto: Propylene copolymer. Mitsui Toatsu Chemicals, Burns Doane Swecker & Mathis, June 15, 1993: US05219968 (10 worldwide citation)

A substantially syndiotactic propylene copolymer which comprises propylene and at least one cyclic diolefin having 6 to 25 carbon atoms or an alkadiene having 6 to 25 carbon atoms and at least one terminal double bond, in the .sup.13 C-NMR spectrum of the copolymer measured in a 1,2,4-trichlorobenze ...


6
Takeo Inoue, Shigeru Kimura, Tutomu Iwatani, Takayuki Yamada, Yukio Ishii, Ryuichi Sugimoto: Polymeric insulating material and formed article making use of the material. Mitsui Toatsu Chemicals, Burns Doane Swecker & Mathis, December 19, 1995: US05476709 (8 worldwide citation)

The invention provides a polymeric insulating material having a high dielectric breakdown voltage. The material comprises polypropylene which has been obtained in a yield of at least 300,000 g/g-Ti based on titanium in a catalyst upon polymerization, contains ash in an amount not greater than 40 ppm ...


7
Tadashi Asanuma, Tetsunosuke Shiomura, Tateyo Sasaki, Tutomu Iwatani, Nobutaka Uchikawa, Kouji Kitabayashi: Butene-1 copolymers and resin compositions containing the same. Mitsui Toatsu Chemicals, Burns Doane Swecker & Mathis, November 30, 1993: US05266641 (8 worldwide citation)

Copolymers of butene-1 and propylene, having specific physical properties and substantially a syndiotactic structure; and easily heat-sealable polypropylene resin compositions comprising 5-50 parts by weight of one of the copolymers and 95-50 parts by weight of a stereoregular crystalline propylene- ...


8
Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tateyo Sasaki, Norihide Inoue, Osamu Uchida, Tutomu Iwatani: Preparation process of syndiotactic polyproplene. Mitsui Toatsu Chemicals Incorporated, Burns Doane Swecker & Mathis, June 27, 1995: US05428127 (6 worldwide citation)

Disclosed herein is a process for preparing a syndiotactic polypropylene comprising washing with a hydrocarbon solvent a polymer obtained by polymerizing propylene in the presence of a catalyst comprising a transition metal compound having an asymmetric ligand. The slurry of the polymer obtained by ...


9
Takeo Inoue, Shigeru Kimura, Tutomu Iwatani, Takayuki Yamada, Yukio Ishii, Ryuichi Sugimoto: Polymeric insulating material and formed article making use of the material. Mitsui Toatsu Chemicals, Burns Doane Swecker & Mathis, November 12, 1996: US05573840 (5 worldwide citation)

The invention provides a polymeric insulating material having a high dielectric breakdown voltage. The material comprises polypropylene which has been obtained in a yield of at least 300,000 g/g-Ti based on titanium in a catalyst upon polymerization, contains ash in an amount not greater than 40 ppm ...


10
Tadashi Asanuma, Tetsunosuke Shiomura, Tateyo Sasaki, Tutomu Iwatani, Nobutaka Uchikawa: Copolymer of propylene and butene-1. Mitsui Toatsu Chemicals Incorporated, Burns Doane Swecker & Mathis, December 8, 1992: US05169924 (5 worldwide citation)

A copolymer of propylene and butene-1, the constituent monomer units of which comprise 20-63 wt. % of propylene and 37-80 wt. % of butene-1, and which exhibits 0.5 or more in the ratio of the sum of the intensities of absorptions observed at about 20.0-21.0 ppm to the sum of the intensities of total ...