Kuraray Co., Ltd.

Nishikawa Rubber Co., Ltd.

Daiso Co., Ltd.

Kyushu University

Toda Kogyo Corporation

Nippon Steel Chemical & Material Co., Ltd.

Junzo Otera

Toru Yano

Yoshiro Furukawa

Masafumi Mikami

Kazuhiro Kitaori

Nobuyuki Sakuda

Hiroshi Yoshimoto

Akihiro Orita

Mikio Kawada

Tadakatsu Mandai

Chihaya Adachi

Shigeaki Suzuki

Hiroko Nomura

Yoshiji Fujita

Takashi Onishi

Hiroshi Miyazaki

Tsutomu Makimoto

Wataru Shinoda

Tetsuya Yanagimoto

Norihisa Hattori

Hirokazu Yamamoto

Bo Li

A compound represented by A-D-A is useful as a light. emitting material used in an organic electroluminescent device and others. 

Compound, light emitting material, and organic light emitting device

A novel process for preparing imidazopyran derivatives of the formula: 

Process for preparing imidazopyran derivatives

A process for preparing a biodegradable resin composition, comprising: providing a reaction mixture comprising at least one hydroxycarboxylic acid and, as a polymerization catalyst, a monoorganotin derivative; heating and stirring the reaction mixture, wherein the heating and stirring step is carried out under a reduced pressure to cause condensation polymerization or carried out in an organic solvent to cause azeotropic dehydrating polymerization. Also disclosed in a biodegradable resin composition prepared by the process.

Biodegradable resin composition and preparation process thereof

Process for preparation of glycidyl ether

Process for the preparation of 3-amino-2-hydroxy-1-propyl ethers

A process for the preparation of a readily hydrolyzable and/or biodegradable polyhydroxycarboxylic acid resin which can be used in agricultural materials, gardening materials, fishery materials, caking materials, medical instruments and materials, etc. and, even when discarded after use, which undergoes hydrolysis and/or is biodegraded into carbon dioxide, water, etc. Also disclosed are a hydrolyzable and/or biodegradable polyhydroxycarboxylic acid resin composition having an increased resin strength and melt viscosity, and a process for the preparation thereof.

Process for the preparation of polyhydroxycarboxylic acid copolymer resin

There is provided a method for easily preparing a polyhydroxycarboxylic acid resin in a one pot reaction by adding 1,3-substituted-1,1,3,3-tetraorganodistanoxan as a polymerization catalyst to a hydroxycarboxylic acid, such as L-lactic acid containing 10 to 50% of water as a starting material, and stirring while heating under a reduced pressure condition or in an organic solvent.

Method for preparing polyhydroxycarboxylic acid resin

A process for producing vitamin A represented by the formula ##STR1## which comprises treating a compound represented by the formula ##STR2## wherein R.sup.1 represents an aryl group which may be substituted, R.sup.21 and R.sup.22 each represent a hydrogen atom or a lower alkanoyl group, R.sup.3 represents an acetal-type protective group for a hydroxyl group, and X represents a halogen atom, with a base; and novel intermediate compounds useful for the above process.

Process for producing vitamin A or its carboxylic acid esters, and

A process for producing vitamin A represented by the formula ##STR1## which comprises treating a compound represented by the formula ##STR2## wherein R.sup.1 represents an aryl group which may be substituted, R.sup.21 and R.sup.22 each represents a hydrogen atom or a lower alkanoyl group, R.sup.3 represents an acetal-type protective group for a hydroxyl group, and X represents a halogen atom, with a base; and novel intermediate compounds useful for the above process.

A process for preparing .alpha.,.beta.-unsaturated aldehydes of the general formula (I) ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are independently a hydrogen atom, or an alkyl or alkenyl group with or without being substituted with a lower acyloxy group. The aldehyde of the general formula (I) is prepared by reaction between an allylic chloride of the following general formula (IIa) ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 have, respectively, the same meanings as defined above, and an amine oxide selected from the group consisting of tri(lower alkyl)amine N-oxides of the formula,

Process for preparing .alpha., .beta.-unsaturated aldehydes

Permanent magnet composites comprising a cured liquid polymer matrix and hard magnetic ferrite particles dispersed therein are disclosed. The magnetic ferrite particles are present in an amount within the range of from about 5 to about 14 parts per part of polymer matrix, the magnetic ferrite particles having a general formula MO.n Fe.sub.2 O.sub.3, wherein M is selected from the group consisting of barium, strontium, lead, and mixtures thereof, and n has a value in the range of from about 4.5 to about 6.2. Various additives may optionally be employed to improve compatibility of the matrix polymer with the ferrite particles and to improve processibility. Also disclosed is a method for producing such magnetic composites.

Permanent magnet composites and method therefor

Growing community of inventors

Okayama, Japan

Junzo Otera