Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Fujisawa Pharmaceutical Company, Ltd.

Katsuji Watanabe

Teruyuki Nagata

Wataru Yamashita

Yoshitsugu Kono

Akihiro Tamaki

Takashi Kobayashi

Masahiro Ohta

Shoji Tamai

Yasunori Yoshida

Hideaki Oikawa

Takahisa Oguchi

Takashi Kuroki

Shoji Obuchi

Kenichi Goto

Hideki Mizuta

Yasuo Kamuro

Toshiyuki Kataoka

Hisato Ito

Yukiko Mori

Kotaro Shimizu

Osamu Kohgo

Eiji Taniguchi

Polyimide and circuit substrate comprising the same

Polyamic acid, polyimide, process for producing these, and film of the polyimide

The invention provides a novel preparation process of a polycondensation type polymer, an excellent polymer which is represented by lactic acid and the preparation process of the polymer, a polycondensation agent used for the preparation process, and an intermediate. Specifically, the invention provides a preparation process of the polycondensation type polymer, for example, polyamide, polyimide, polythioester and polyester, comprising bonding a carboxyl group comprising compound with an active hydrogen group comprising compound in the presence of haloiminium salt. The invention provides excellent polylactic acid having a controlled D/L-isomer ratio in the repeating structural units and preparation process of polylactic acid, and further provides a haloiminium salt compound used for the preparation process and an intermediate compound of acid chloride.

Process for preparing polycondensation polymer compound

A process for the continuous preparation of aniline by hydrogenating nitrobenzene with hydrogen is disclosed which comprises the steps of suspending, in an aniline solvent, a catalyst of palladium or palladium-platinum which is deposited on a lipophilic carbon having an oil absorbency of at least 100, and carrying out reaction at a temperature of from 150.degree. to 250.degree. C. substantially in the absence of water while aniline and water formed in said reaction are continuously distilled off as vapor from the reaction product, and the concentration of nitrobenzene in the reaction solution is maintained at 0.01% by weight or less, wherein a zinc compound is added to the reaction system as a promotor and carbon monoxide is added to the hydrogen at a concentration of 1-500 ppm.

Process for preparing high-purity aniline

A purification process for polyhydroxycarboxylic acids which comprises dissolving polyhydroxycarboxylic acid in an water-immiscible phenol or an organic solvent containing said water-immiscible phenol, successively bringing the resulting solution into contact with water which contains an acidic material, separating the organic layer from an aqueous layer, and isolating polyhydroxycarboxylic acid from the organic layer. The process can efficiently remove a catalyst contained in the polyhydroxycarboxylic acid prepared in the presence of the catalyst, does not require polyhydroxycarboxylic acid to be in the form of a solid, and can treat polyhydroxycarboxylic acid in a higher concentration as compared with using chlorinated hydrocarbon as a solvent.

Purification process of polyhydroxycarboxylic acid

A process for the continuous preparation of aniline by hydrogenating nitrobenzene is disclosed which comprises the steps of suspending, in an aniline solvent, a catalyst of palladium or palladium-platinum which is deposited on a lipophilic carbon having an oil absorbency of at least 100, adding a zinc compound and an alkali metal carbonate or a zinc compound and an alkali metal bicarbonate as promotors to the reaction system, and carrying out reaction at a temperature of from 150 to 250.degree. C. substantially in the absence of water while aniline and water formed in said reaction are continuously distilled off as vapor from the reaction product, and the concentration of nitrobenzene in the reaction solution is maintained at 0.01% by weight or less.

The invention relates to plant growth regulating compounds which are pyrazoloisoquinoline derivatives.

Pyrazoloisoquinoline derivatives, plant growth regulating compositions,

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Fukuoka, Japan

Katsuji Watanabe