Mitsubishi Chemical Industries Limited

Mitsubishi Kasei Corporation

Mitsubishi Chemical Corporation

Ntt Mobile Communications Network, Inc.

Japan Polypropylene Corporation

Japan Polyethylene Corporation

Japan Polychem Corporation

Yasuo Maruyama

Yoshinori Suga

Eiji Isobe

Eiji Tanaka

Toru Suzuki

Toshihiko Sugano

Masami Yabusaki

Masayoshi Hasuo

Naoshi Iwama

Nobuaki Goko

Takayuki Aoshima

Shoichi Hirata

Fumihiko Shimizu

Yumito Uehara

Yasuyuki Uchiyama

Nobuo Enokido

Taku Kato

Masami Kashimoto

Genjiro Kakogawa

Takehiro Sagae

Sugio Nishimura

Kazuo Yamaguchi

Hisashi Shoda

Satoshi Hayakawa

Yoshiyuki Ishihama

Stefan Sieber

Eriko Takemoto

Hiroshi Nakamura

Akihisa Nakajima

Takao Tayano

Kenichi Yamaguchi

Masahiro Sawada

Akio Tanna

Naomasa Sato

Yukichi Saito

Yohei Konishi

Hisashi Kitada

Hiroshi Tsukahara

Yuuji Fujita

Tsuyoshi Ogasawara

Junichi Gotoh

Yu Hayakawa

Kimiho Kosegaki

Osamu Shibata

Takao Usami

Hasuo Masayoshi

Kakogawa Genjiro

Yamaguchi Kazuo

Shiokazu Fujiwara

Masao Sakaizawa

Hidehito Katou

An object of the present invention is to provide a novel catalyst for olefin (co)polymer production, which has high activity without using a large amount of a cocatalyst and is aimed for obtaining a particulate olefin (co)polymer. The invention relates to an olefin polymerization catalyst which comprises: a solid carrier (1) that has been brought into contact with a specific compound; and a metal catalyst component (2) that contains a transition metal compound (C) containing a transition metal M belonging to Group 9, 10, or 11 of the periodic table and has a reactive group R.

Olefin polymerization catalyst and method for producing olefin polymer

Propylene block copolymer and propylene resin composition

Catalysts for polymerization of &agr;-olefins, process for producing &agr;-olefin polymers, novel transition metal compounds and catalyst components for polymerization of &agr;-olefin

To register current codec types of a mobile station with a network side, the mobile station notifies, when it conducts the location registration or a mobile user replaces his or her old mobile station, a visitor location switching system which is associated with the current location of the mobile station, of the codec types supported by the mobile station using a mobile communication control signal between the mobile station and the mobile network. Receiving the notification, the visitor location switching system enters the update of the codec types into a location register in a memory home station that controls the mobile network The codec types can be thus registered into the mobile network using the mobile communication control signal. Since the mobile network can always acquire the latest codec types for the mobile station, the discrepancy is canceled between the codecs the mobile station supports and the codecs the network registers.

Mobile communications system

Transition metal compounds

Mobile communication system

A method for polymerizing olefins which comprises using a catalyst which comprises, as the essential components, (A) a metallocene-type transition metal compound and (B) at least one member selected from the group consisting of (1) an ion-exchanging layered compound other than a silicate and (2) an inorganic silicate, which is obtained by salt-treatment and/or acid-treatment and which has a water content of not higher than 1% by weight.

Method for polymerizing olefins using a novel catalyst

A catalyst for polymerizing an olefin, which comprises (A) a metallocene transition metal compound, (B) (1) an ion-exchanging layered compound other than a silicate or (2) an inorganic silicate prepared by treating a starting ion-exchanging layer compound other than a silicate or a starting silicate with a salt, an acid, or a combination thereof, said component (B) having a water content not higher than 1% by weight which is obtained by heat-dehydrating component (B) under an inert gas atmosphere or under reduced pressure, and (C) an organoaluminum compound.

Catalyst for polymerizing an olefin and method for polymerizing the

A switching center 30 comprises a memory part M2, a memory part M3, and a memory part M4. The memory part M2 stores a terminating terminal number corresponding to and registered by each subscriber. The memory part M3 stores idle/busy information corresponding to each terminal. The memory part M4 stores idle/busy information corresponding to each subscriber. When a subscriber 11.sub.1 makes a call at a terminal 12.sub.2, the switching center 30 determines whether the idle/busy information for the subscriber 11.sub.1 stored in the memory part M4 is idle or busy. When the idle/memory information represents idle, the switching center 30 refers to the idle/busy information for the terminal 12.sub.2 stored in the memory part M3. When this idle/busy information represents idle, the switching center 30 reads out the terminal number of a terminating terminal of a terminating subscriber stored in the terminating terminal memory part M2 and performs an outgoing call connection process. At this point, the switching center 30 also sets the idle/busy information for the subscriber 11.sub.1 and the terminal 12.sub.2 to busy state. When the subscriber 11.sub.1 makes a call, while the terminating terminal 12.sub.1 is performing an incoming call connection process for the subscriber 11.sub.1, since the idle/busy information for the subscriber 11.sub.1 has been set to the busy state, even if the terminal 12.sub.2 is idle, the switching center 30 does not perform an outgoing call connection process for the subscriber 11.sub.1 at the terminal 12.sub.2.

Connection control method for personal communications

Mobile communication method for controlling origination or termination

A catalyst for polymerizing an olefin which consists essentially of a product obtained by contacting (A) a metallocene-type transition metal compound, (B) at least one member selected from the group consisting of clay, clay minerals, ion exchanging layered compounds, diatomaceous earth, silicates and zeolites, and (C) an organic aluminum compound.

Catalyst for polymerizing an olefin and method for producing an olefin

A process for producing an olefin polymer which comprises polymerizing an olefin or copolymerizing olefins in the presence of a catalyst comprising a novel solid catalyst component (A), an organometallic compound (B) and an electron donating compound (C) is disclosed. According to the process of the present invention, an olefin polymer excellent in stereospecificity and particle property can be obtained. The catalyst used in the process of the present invention shows a very slight lowering in polymerization activity during a long-term polymerization, and therefore, the productivity of an olefin polymer can be improved.

Process for producing olefin polymer

A modified 3-methylbutene-1 polymer as prepared by grafting a monomer containing an unsaturated group onto a 3-methylbutene-1 homo- or copolymer, a 3-methylbutene-1 polymer composition comprising a 3-methylbutene-1 polymer and a fibrous material, and a molded article comprising a mold of a 3-methylbutene-1 polymer and a thin metallic layer provided on the mold.

3-methylbutene-1 polymer, composition containing said polymer, and

A highly crystalline propylene polymer composition which is obtained by preliminarily polymerizing, in the presence of a catalyst comprising a solid titanium trichloride catalyst complex containing a complexing agent and having an aluminum content of at most 0.15 by atomic ratio of aluminum to titanium and an organoaluminum compound and optionally an electron donative compound, 3-methylbutene-1 in an amount exceeding 10 g per g of the solid titanium trichloride catalyst complex and then polymerizing propylene, or propylene and other .alpha.-olefin having from 2 to 18 carbon atoms, in an amount of at least 500 g per g of the solid titanium trichloride catalyst complex, and which contains from 0.01 to 20% by weight of the 3-methylbutene-1 polymer based on the total weight of the 3-methylbutene-1 polymer-containing propylene polymer composition.

Polypropylene composition and highly transparent polypropylene film made

Growing community of inventors

Yokohama, Japan

Yasuo Maruyama