Mitsui Chemicals, Inc.

Mitsui Toatsu Chemicals, Incorporated

Bridgestone Corporation

Visual Technology Laboratory Inc.

Akinori Nagatomo

Hiroaki Tamatani

Akihiro Yamaguchi

Masanobu Ajioka

Masaru Wada

Takeshi Kobayashi

Toshio Katoh

Kouki Oogaki

Chojiro Higuchi

Masayuki Furuya

Yoshihiro Irizato

Makoto Sukegawa

Kazuya Tsukamoto

Nobumasa Arashiba

Atsuo Otsuji

Masatoshi Takagi

Tsuneji Suzuki

Katashi Enomoto

Taizo Nishimoto

Kouji Suesugi

Hidetoshi Tsunoda

Yoshiki Nakamura

Yoshinori Kuriya

Noriaki Asada

Kazunori Kaneda

Ikumi Kitada

Shoko Matsumura

Kiyomi Kido

Sueko Kanaya

Tetsuya Toida

Narimichi Honda

Yoshinori Bridgestone Corporation Kuriya

Kazunori Bridgestone Corporation Kaneda

Nobumasa c/o Mitsui Chemicals Inc Arashiba

An analysis unit determines at least two boundaries by determining; in a coordinate system indicating a correlation between a luminance contrast value between a luminance of an attention portion and a luminance of a background portion, and a luminance average value of a visual target including the attention portion and the background portion; the boundary between a region where a subject has a visibility and a region where the subject does not have the visibility for each combination of stimulus values of a color stimulus of a visual target.

Visual function examination system and optical characteristic calculation system

This invention provides a rubber composition comprising 1-10 parts by mass of sulfur and 0.1-10 parts by mass of a compound represented by the following general formula (1) or a composition containing the compound as a main component based on 100 parts by mass of a rubber component as well as a pneumatic tire in which at least one of a carcass () and a belt () includes a layer composed of steel cords covered with a coating rubber, characterized in that the above rubber composition is used as the coating rubber covering the steel cords in at least one of the carcass () and the belt (): (wherein R represents a divalent aliphatic group having a carbon number of 1-16 or a divalent aromatic group).

Rubber composition and pneumatic tire using the same

A method of producing a compound represented by the following general formula (3): [wherein R is a bivalent aliphatic group having a carbon number of 1-16 or a bivalent aromatic group], which comprises a step (i) of reacting a compound represented by the following general formula (1): with a carboxylic acid halide represented by the following general formula (2): [wherein R is a bivalent aliphatic group having a carbon number of 1-16 or a bivalent aromatic group and X is a halogen atom] in the presence of a basic compound to form an ester, and a step (ii) of conducting a heat treatment after the step (i) to decompose an oligomer in the ester.

Method for producing dihydroxybenzene derivative

This invention relates to a method for producing a carboxylic acid chloride, which efficiently decomposes a Vilsmeier reagent type compound in a carboxylic acid chloride lacking a thermal stability or a carboxylic acid chloride hardly distilled in practice due to a high boiling point with a simple operation and has no adverse effect on a subsequent step, and more particularly to a method for producing a carboxylic acid chloride, characterized by comprising reacting a carboxylic acid with a chlorinating agent in the presence of a catalyst, removing the excessive chlorinating agent from a reaction system after the reaction, and then further adding 1.0 to 3.0 equivalents of the starting carboxylic acid based on the catalyst to the reaction system to decompose a Vilsmeier reagent type compound remaining in the reaction system.

Method for producing carboxylic acid chloride

A glycoside in which at least two phenolic hydroxyl groups of a compound having at least two phenolic hydroxyl groups in its molecule are glycosidically linked to anomeric carbon atoms of at least two sugar molecules can be prepared with high yield by a method including the step of allowing phenolic hydroxyl groups of a compound having at least two phenolic hydroxyl groups in its molecule to react with sugar molecules each having an acetylated hydroxyl group attached to an anomeric carbon atom in the presence of an organic solvent and an acid catalyst while removing acetic acid formed during the reaction from the reaction system.

Process for producing glycoside

A (meth)acrylic ester compound represented by the general formula (1) and a dental material containing the compound, 

(Meth) acrylic ester compound and use thereof

This invention provides a compound represented by the following general formula (1) and capable of suppressing the blooming, which is observed in the compounding of the resorcin or the RF resin, as far as possible while maintaining the workability and high humidity-aged adhesion of the rubber composition obtained by compounding with rubber, reducing the deterioration of the adhesiveness during the storage of the rubber composition and stably developing the adhesiveness as well as the composition containing the above-mentioned compound as a main component: (wherein R represents a divalent aliphatic group having a carbon number of 1-16).

Compound and composition containing the same

A process for preparing a hydroxybenzoic acid is herein disclosed which comprises reacting a phenol with an alkali metal compound by the use of an aprotic polar organic solvent as a reaction solvent to form an alkali metal salt of the phenol, and then reacting this alkali metal salt with carbon dioxide to obtain a hydroxybenzoic acid, said process comprising the step of carrying out the reaction under conditions that a molar ratio of the phenol to the total of the alkali metal compound and the aprotic polar organic solvent is larger than 1. Furthermore, the process may contain the steps of precipitating crystals from the reaction solution, separating the solid from the solution to obtain a wet alkali metal salt of the hydroxybenzoic acid, dissolving the wet alkali metal salt in water, and precipitating crystals from the solution by acidification to obtain the hydroxybenzoic acid.

Process for preparing hydroxybenzoic acids

A process is disclosed for producing with good productivity a cross-linked polyaspartic acid resin having biodegradability and high water absorbency. The process features inclusion of one of the following steps: (a) a polysuccinimide, which has been brought into a dispersed state by a dispersant, and a cross-linking agent are reacted to produce the cross-linked polyaspartic acid resin; (b) imide rings of a cross-linked polysuccinimide are subjected to a hydrolysis reaction while controlling a swelling degree of a resulting gel, whereby the cross-linked polyaspartic acid resin is produced; and (c) a gel of a cross-linked polysuccinimide, which has been obtained by reacting a cross-linking agent to a solution of a polysuccinimide in an organic solvent, is disintegrated to subject imide rings of the cross-linked polysuccinimide to a hydrolysis reaction, so that the cross-linked polyaspartic acid resin is produced. The process may also include one or both of the following steps as needed: (d) a gel of the cross-linked polyaspartic acid resin is washed with water and/or a water-miscible organic solvent; and (e) the polysuccinimide is produced using a basic amino acid as a cross-linking agent.

Production process of cross-linked polysuccinimide resin

Production process of cross-linked polyaspartic acid resin

A polymer containing the following monomer unit (I) and/or (II): ##STR1## and a process for preparing the polymer which comprises, in ring opening reaction of the polysuccinimide, opening the ring of polysuccinimide by using an amino acid ester having an extremely high reactivity in place of an .alpha.-amino acid having an extremely low reactivity. The polymer is characterized by having no irritation to organisms (e.g., eyes and skin), and for example, the polymer is useful in the industrial fields of fields of medical supplies, health, beauty and sanitary aids, quasi-pharmaceuticals, and the like.

Polymer containing monomer units of chemically modified polyaspartic

A process for preparing a novel superabsorbent polymer which is readily hydrolyzed and conform to environment by reacting a polysuccinimide with a diamine in an aqueous solution or an organic solvent to partially crosslink the polysuccinimide, and subsequently or concurrently hydrolyzing the remaining imide ring with an alkali while controlling the pH; and the superabsorbent polymer thus obtained.

Superabsorbent polymer and process for producing same

In the process for preparing polysuccinimide by dehydration condensation of aspartic acid in an organic solvent, polysuccinimide can be obtained simply and suitably in industry by removing a portion or more of the organic solvent from the reaction mixture while charging to the reaction mixture an additional organic solvent containing less amount of water than that of the removed organic solvent.

Preparation process of polysuccinimide

.alpha.-L-Aspartyl-L-phenylalanine methyl ester (.alpha.-APM) is prepared by catalytic hydrogenation of N-benzyloxycarbonyl-.alpha.-L-aspartyl-L-phenylalanine methyl ester (Z-.alpha.-APM). The catalytic hydrogenation is conducted in an aqueous suspension containing the Z-.alpha.-APM in the form of particles whose average particle size is not greater than 800 .mu.m. The starting Z-.alpha.-APM may contain up to 30 wt. % of its .beta.-isomer provided that the process additionally includes recrystallization of the .alpha.-APM, collection of the .alpha.-APM by filtration and recycling of the filtrate for use in the aqueous suspension of Z-.alpha.-APM.

Preparation process of .alpha.-aspartyl-L-phenylalanine methyl ester

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Omuta, Japan

Akinori Nagatomo