Asahi Kasei Chemicals Corporation

Hitachi, Ltd.

Mitsubishi Electric Corporation

Hitachi Chemical Company, Ltd.

Asahi Kasei Kabushiki Kaisha

Akio Fujiwara

Hiroshi Kamo

Hitoshi Yokono

Masao Mitani

Takashi Nozaki

Naoya Kanda

Fusaji Shoji

Masafumi Okazaki

Yutaka Akiba

Ryoji Tanaka

Susumu Kasukabe

Tsuyoshi Fujita

Fumio Kataoka

Haruhiko Matsuyama

Kazuo Hirota

Katsumi Ohata

Shoichi Iwanaga

Fumio Matsushita

Kenya Tanaka

Yasushi Ishikawa

Toshiyuki Onishi

Koichi Hasebe

Takayoshi Sowa

Hideki Nasu

Wataru Hirosue

Hironobu Okino

Teruji Aizawa

An object of the present invention is to provide a polyethylene powder for a fiber which is excellent in the color tone of an obtained article and allows an obtained fiber to be highly drawn, and a fiber and an article made of the polyethylene powder for a fiber. The present invention provides a polyethylene powder for a fiber, wherein the intrinsic viscosity measured at 135&#xb0; C. in decalin is 10 dL/g or higher and 40 dL/g or lower, the total amount of Al, Mg, Ti, Zr, and Hf is 1.0 ppm or higher and lower than 15 ppm, the amount of a particle having a particle size exceeding 355 &#x3bc;m is 2.0% by mass or lower, and the amount of a particle having a particle size of 75 &#x3bc;m or smaller is 3.0% by mass or higher and 50.0% by mass or lower.

Polyethylene powder for fiber, fiber, and article

It is intended to provide a polyethylene powder which can offer a fiber excellent in resistance to end breakage, dimensional stability, and acid resistance and/or a microporous membrane excellent in dimensional stability and acid resistance, and a microporous membrane and a fiber which are obtained by forming the polyethylene powder. The present invention provides a polyethylene powder comprising: 0.5 ppm or higher and 3,000 ppm or lower of aluminum hydroxide having an average particle size smaller than 50 &#x3bc;m; and 0.5 ppm or higher and 12 ppm or lower of a magnesium element, wherein the polyethylene has a viscosity-average molecular weight of 100,000 or larger.

Polyethylene powder, microporous membrane, and fiber

The present disclosure relates to a polyethylene resin composition contains an ethylene homopolymer.

Polyethylene resin composition, microporous film and method for manufacturing the microporous film, and separator for battery

The rotating electrical machine of the present invention includes: a magnet holder made of a non-magnetic material, which is formed by coupling a columnar portion for retaining the permanent magnet in a circumferential direction, and an annular portion for covering each axial side surface of the permanent magnet. The magnet holder includes, on an outer diameter side of both circumferential side surfaces of the columnar portion, engaging portions which engage with respective locking portions of the magnet cover, and includes, on an inner diameter side of each of both the circumferential side surfaces of the columnar portion, an extending portion extending along an inner peripheral surface of the magnet cover with a clearance (D) with respect to the inner peripheral surface of the magnet cover.

Rotating electrical machine

The present invention relates to an ultrahigh-molecular-weight ethylene copolymer powder having an intrinsic viscosity (&#x3b7;) of 10 dl/g to 34 dl/g, obtainable by copolymerizing ethylene and at least one olefin selected from the group consisting of &#x3b1;-olefins having 3 to 20 carbon atoms, cyclic olefins having 3 to 20 carbon atoms, compounds represented by the formula CH&#x2550;CHRwherein Ris an aryl group having 6 to 20 carbon atoms, and linear, branched or cyclic dienes having 4 to 20 carbon atoms, wherein

Ultra high molecular weight ethylene copolymer powder

A catalyst for olefin polymerization, comprising:

Process for polymerization of olefins

A novel olefin polymerization catalyst comprising: (A) a transition metal compound comprising a transition metal having &eegr;-bonded thereto a cyclic anionic ligand; (B) a mixture of (B-1) an activator compound capable of forming, together with component (A), a metal complex having a catalytic activity and (B-2) an organometal compound, the activator compound (B-1) comprising a cation and a noncoordinating, compatible anion; (C) a solid component; and optionally (D) an organoaluminum compound, wherein the catalyst is obtained by contacting components (A) to (C) and optionally component (D). The olefin polymerization catalyst of the present invention is advantageous not only in that it has high polymerization activity, but also in that an olefin polymer having excellent powder characteristics can be efficiently produced by suspension polymerization (slurry polymerization) or gaseous phase polymerization in a continuous manner, using a commercial scale plant, while preventing the occurrence of adherence of the polymer to the inside surfaces associated with a polymerizer.

Olefin polymerizaion catalyst and method for polymerizing an olefin using the catalyst

An ion-beam sputtering apparatus using an insulator target and a method for operating the same which is characterized by interposing a conductor film forming process during the ion beam processings using the insulator target. This conductor film formation prevents undesired charge build up on the inside of the apparatus and prevents undesired occurrence of abnormal discharge in the ion beam processing using an insulator as a target.

Ion-beam sputtering apparatus and method for operating the same

A method for forming conductor layers of substrates for mounting LSIs and the like and a fabrication method of multilayer substrates are disclosed. These methods comprise steps of forming a metal underlayer having a shape similar to that of a conductor pattern on the substrate, forming an insulation layer over portions of the substrate which are not covered by the metal underlayer, and disposing a plating layer on the metal underlayer by carrying out electroless plating while using the insulation layer as the resist and thereby forming conductors. As compared with a conventional conductor layer forming method, the number of fabrication steps is reduced. And the elimination of the surface grinding step facilitates the fabrication.

Method for forming conductor layers and method for fabricating

A probe head for use with equipment for testing a semiconductor device such as a large scale integrated circuit (LSI) includes electrode pads are formed on a circuit substrate, and a pad protecting conductive layer formed on the pads. A probe pin forming material is grown which is worked into a pin-like configuration, thereby improving a pin assembling property of a probe head portion and this realizes highly accurate pinning with high reliability.

Method of manufacturing probing head for testing equipment of

An organic silicon-terminated polyimide precursor having a very stable solution viscosity is produced by polycondensing 100 parts by weight of a mixture composed of 90 to 99.5% by mole of an organic diamine represented by the following general formula (I) and 10 to 0.5% by weight by mole of an organic silyl represented by the following general formula (II): ##STR1## wherein R.sup.1 and R.sup.2 are divalent organic groups; R.sup.3 and R.sup.4 are monovalent organic groups; m is 0, 1, 2, or 3, with an organic tetracarboxylic acid dianhydride represented by the following general formula (III) in a molar amount corresponding to the 100 parts by weight of the mixture of the organic diamine and the organic silyl represented by the said general formulae (I) and (II), respectively, in an organic polar solvent at 0.degree. to 40.degree. C., thereby obtaining a solution of organic silicon-terminated polyimide precursor, and heating the solution at 50.degree. to 80.degree. C.: ##STR2## wherein R.sup.5 is a tetravelent organic group. The polyimide having good adhesion and mechanical characteristics is obtained by further heating the precursor solution at 100.degree. to 450.degree. C.

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Tokyo, Japan

Akio Fujiwara