Kuraray Co., Ltd.

Railway Technical Research Institute

Masakazu Nishiyama

Shinya Inada

Hiroyuki Kawai

Akira Kubotsu

Akio Mizobe

Takashi Katayama

Tomohiro Hayakawa

Akio Ohmory

Hideo Hayashi

Hirotoshi Miyazaki

Tomoyuki Sano

Hideki Kamada

Hayami Yoshimochi

Hiroshi Narukawa

Masahiro Satoh

Satoru Kobayashi

Kazumasa Kusudo

Fumio Nakahara

Yoshiaki Yasuda

Akitsugu Akiyama

Toshimitsu Harada

Yoshihiro Iwasaki

Tomokazu Ise

Hisashi Nagi

Isao Tokunaga

Naoyuki Yaguchi

Junichi Taniguchi

Eiichi Ishida

Suguru Mizuki

Kenji Nagamatu

Yasuhiro Harada

Shogo Mamada

Masaru Tateyama

Hidekazu Taniguchi

Sinya Inada

Provided is a separator for alkaline batteries which can not only prevent batteries from internal short circuit by inhibiting the dendrite formation at anode, but also enables to have a low electrical resistance. The separator for alkaline batteries comprises a composite sheet in which a base layer comprising a wet-type nonwoven material formed from alkaline resistant fibers is covered with a nanofiber layer comprising a modified polyvinyl alcohol fiber which has a fiber diameter of 10 to 1000 nm and a liquid absorption amount by fibers of 4.0 to 40.0 g/g after immersion in a 35% aqueous solution of KOH.

Separator for alkaline battery, method for producing the same, and battery

The present invention aims to provide a polypropylene fiber (PP fiber) excellent in strength, heat resistance, and water-absorption properties, a method of producing the same, and a hydraulic composition, a rope, a sheet-shaped fiber structure, and a composite material with an organic polymer each using the PP fiber. The present invention provides: a PP fiber having a fiber having a fiber strength of 7 cN/dtex or more and having either or both of (i) DSC properties such that the endothermic peak shape by DSC is a single shape having a half width of 10&#xb0; C. or lower and the melt enthalpy change (AH) is 125 J/ g and (ii) irregular properties such that the single fiber fineness is 0.i to 3 dtex and irregularities are formed on the surface.

Polypropylene fiber, method of producing the same and utilization of the same

The present invention provides a conductive sheet having a surface resistance of 10 &#x3a9;/sq or lower on both surfaces, the conductive sheet comprising a sheet (A) and a sheet (B) laminated to the sheet (A), the sheet (A) having an apparent specific gravity of 0.05 g/cmto 0.50 g/cmand being formed from fibers having a diameter within the range between 3 and 20 &#x3bc;m, and the sheet (B) being formed from fibers having a diameter of 3 &#x3bc;m or smaller. The sheet (A) may be a fibrous material comprises an organic polymer fiber as its main component.

Multilayered conductive sheet and electrode

An alkaline battery separator including 25 to 62% by mass of an alkali-resistance synthetic fiber, 5 to 25% by mass of a fibrillated organic solvent-spun cellulose fiber having a Canadian standard freeness value of 10 to 280 ml, and 33 to 50% by mass of a mercerized pulp having a Canadian standard freeness value of not less than 550 ml, wherein the fibrillated organic solvent-spun cellulose fiber intertwines with the mercerized pulp.

Alkaline battery separator comprising alkali-resistance synthetic fiber, fibrillated organic solvent-spun cellulose fiber and mercerized pulp, and alkaline primary battery

High-absorbent polyvinyl alcohol fibers and nonwoven fabric comprising them

Flame-retardant polyvinyl alcohol base fiber

Provided are polyvinyl alcohol-based synthetic fiber having excellent performances as a fiber for FRC that is prepared by autoclave curing and its very effective production processes. One of the processes comprises having a monoaldehyde or a dialdehyde or its acetalization product penetrate into the central region of a polyvinyl alcohol-based synthetic fiber at a first stage and then, at a second stage, effecting crosslinking reaction with a mixed solution containing a monoaldehyde and an acid. The other process comprises conducting acetalization with a bath containing 100 to 250 g/l of formaldehyde and 30 to 80 g/l of sulfuric acid at a temperature of 70.degree. to 100.degree. C. The processes can give a polyvinyl alcohol-based synthetic fiber having a strength of at least 11 g/d, a gel elasticity of at least 6.0.times.10.sup.-3 g/cm.multidot.d and a dissolution ratio of not more than 40% and being able to withstand an autoclave curing at 140.degree. C. which is necessary for securing the dimensional stability of the resulting cement products.

Polyvinyl alcohol-based synthetic fiber

Provided is a high-performance PVA fiber and its production. Each filament of the PVA fiber of the present invention having a structure comprising an aggregate of substantially innumerable fibrils, the fiber has high strength, elastic modulus, and resistances to fatigue, hot water and chemicals and can be pulpified while keeping its excellent features such as high strength. The PVA fiber of the present invention cannot, even drawn to a high ratio, be readily whitened by virtue of its fibril-aggregate structure, and can hence be made still higher in performances. The PVA fiber can be obtained by adding to a PVA solution a relatively large amount of surface active agent, and wet or dry-jet-wet spinning the thus prepared dope solution into an aqueous alkaline coagulating bath.

Synthetic polyvinyl alcohol fiber and process for its production

Growing community of inventors

Okayama, Japan

Masakazu Nishiyama