Mitsui Toatsu Chemicals, Incorporated

Mitsubishi Cable Industries, Ltd.

Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha

Nec Corporation

Shin-etsu Chemical Co., Ltd.

Nec-mitsubishi Electric Visual Systems Corporation

Hiroshi Kato

Atsuhiko Hiai

Kenji Fujiwara

Kiyoshi Furukawa

Nobutaka Ueda

Kazuhiko Kanemitsuya

Seiji Komine

Yuji Matsuu

Nobutaka Uchikawa

Tadatoshi Honda

Ryuichi Sugimoto

Shiro Asano

Katsumi Yoshino

Kazuo Wakimura

Yoshihiko Kambara

Kohei Shizuka

Tetsuya Ashida

Masanori Fujii

Shoji Hoshino

Junji Mikami

Yoshiaki Ito

Seiya Yamada

Hiroshi Tokonami

Yuri Kawano

Masaki Kawahigashi

Mitsuji Sato

Atsuo Sawada

Mitsuo Saitou

Tsuyoshi Ikeda

Minoru Okamoto

Tetsuo Yoshiyama

Junichiro Ikehara

Naomichi Osada

Hiroshi Ishibashi

Yuuji Matsuu

Koichi Shiomoto

Yoshiro Habuka

Susumu Yoshinaga

Eiji Onuma

Provided are a manufacturing method of an optical fiber base material and an optical fiber base material manufactured in the manufacturing method, the manufacturing method including: a process of combining at least two core base materialsby fusion-bonding to produce a single core base material; a process of fusion-bonding a pair of dummy glass rodsandat both ends of the core base materialto produce a starting glass rod; a process of depositing, at an outer surface of the starting glass rod, glass particles generated by flame hydrolysis, to produce a porous base material; and a process of sintering and vitrifying, into transparent glass, the porous base material, to produce an optical fiber base materialthat includes a core portion and a clad portion.

Base material for optical fiber and method for production thereof

The invention is directed to a method and apparatus for diagnosing deterioration of an article having at least a covering layer made from an organic polymer material. The method comprises (i) forming a data group for deterioration diagnosis comprising deterioration diagnostic characteristic values and corresponding ultrasonic wave propagation characteristic values for samples having different material specifications, (ii) propagating an ultrasonic wave through the covering layer of the article to measure an ultrasonic wave propagation characteristic of the covering layer, and (iii) determining a corresponding deterioration diagnostic characteristic from the data group for the ultrasonic wave propagation characteristic of the covering layer. The apparatus comprises (i) an ultrasonic wave propagation measuring device comprising an ultrasonic wave transmitting means, an ultrasonic wave receiving means, a delay chip, and a propagation time measuring means, (ii) a storage unit containing a data group for deterioration diagnosis, and (iii) a central processing unit.

Method and device for diagnosing deterioration of an article having at least a covering layer organic polymer material

In a system for use in combination with a power source circuit, a holding circuit is operable in response to interruption of an input signal to deenergize the power source circuit and is put into a self-holding state to hold a stop mode of the power source circuit. The self-holding state is released on arrival of the input signal to unlock the stop mode.

Power supply system capable of reducing power consumption during interruption of an external input signal given to an operating circuit

Power supply system capable of reducing power consumption during

An insulating composition comprising a syndiotactic polypropylene (s-PP) having a syndiotactic pentad ratio of not less than 0.7 and an MFR of 0.05-2.0 g/10 min. The composition of the present invention comprising a specific s-PP can provide an article having superior electric properties and mechanical properties. In particular, the article can retain superior electric properties and mechanical properties even after rapid cooling or gradual cooling for re-processing of said article. Accordingly, the composition of the present invention can be suitable used for insulating layer, coating layer of various power cables inclusive of high voltage wires and low voltage wires, coating layer of optical fibers and insulator of wire-connecting structures.

Insulating composition and formed article thereof

Melamine cyanurate is prepared by heating melamine powder and cyanuric acid powder at 250.degree. to 500.degree. C. substantially in the absence of any liquid medium. The melamine cyanurate can be obtained in a granular form when the heating is conducted subsequent to granulation of a mixture of both the powders.

Granular melamine cyanurate and preparation process thereof

Process for preparing glycine

A method for purifying glycine characterized by comprising the steps of adjusting the pH of an aqueous glycine solution to 6 or less with a mineral acid and/or an organic acid or an acidic cation exchange resin and subsequently decoloring said aqueous glycine solution by active carbon treatment.

Method for purifying glycine

A process for preparing glycine which comprises the steps of reacting glycolonitrile, carbon dioxide gas, ammonia and water to obtain a reaction solution containing glycine, concentrating this reaction solution in two steps, recycling a gaseous phase portion formed in a primary concentration step to a reaction zone, and recycling to the reaction zone, a mother liquor left after glycine crystals have been separated from a concentrate obtained in a secondary concentration step.

This invention provides a flame-retardant resin composition comprising:

Flame-retardant resin compositions

This invention provides a flame-retardant resin composition comprising (A) about 100 parts by weight of at least one resin selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, isobutylene-isoprene copolymer and ethylene-propylene-diene terpolymer, (B) about 50 to about 300 parts by weight of a hydrate of metallic oxide, and (C) about 0.05 to about 5 parts by weight of a phosphorus-containing titanate coupling agent, the composition having been already crosslinked by use of about 0.1 to about 20 parts by weight of a crosslinking agent or by irradiation of ionizable radiation. The composition of the invention has an outstanding flame retardancy and can be made into a molded product capable of exhibiting fully useful mechanical and electrical characteristics.

An aqueous solution of acrylamide obtained by catalytic hydration of acrylonitrile in the presence of a copper-based catalyst is purified by the steps, in sequence, of (a) removal of the unreacted acrylonitrile, (b) removal of copper, (c) treatment under basic conditions, (d) cation exchanging treatment and (e) weakly basic anion exchanging treatment. The acrylamide obtained by this process has good storage stability. An acrylamide polymer produced from this monomer is useful as a flocculant having a reduced content of the unreacted monomer, a high molecular weight and excellent solubility in water.

Process for purifying an aqueous solution of acrylamide

Recovery of partially hydrolyzed copolymers of vinyl acetate and unsaturated carboxylic or sulfonic acid from aqueous solution dissolving them by adding an acid to the solution at a temperature of at least 40.degree. C. and then separating the deposited copolymers. This process can be advantageously applied to waste water dissolving the above hydrolyzed copolymers from desizing and washing of textile. About 70 to about 90% of the hydrolyzed copolymers dissolved in the solution can be recovered, and the recovered copolymers can be reused as a sizing agent for fibers.

Process for recovering modified polyvinyl alcohols from aqueous solution

A process comprising the steps of (1) sizing a warp with an aqueous solution containing a partially hydrolyzed polyvinyl acetate, having a degree of hydrolysis of 50% to 80% by mole and an average degree of polymerization of not less than 400, and an anionic surface active agent capable of solubilizing the hydrolyzed polyvinyl acetate in water or capable of raising the cloud point of the hydrolyzed polyvinyl acetate, and then weaving, (2) subjecting the woven cloth to desizing in a scouring bath, and washing the cloth, and then (3) treating the desizing and washing waste water with an agent selected from polyvalent metal salt chelate-forming agents, strong acids and cationic compounds by adding the agent to the waste water to deposit the hydrolyzed polyvinyl acetate, and separating the deposited hydrolyzed polyvinyl acetate. The sizing work efficiency is good, the weaving efficiency is high, the desizing is smooth, and the waste water treatment is easy.

Process of sizing, weaving, desizing and waste water treatment

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Osaka, Japan

Hiroshi Kato