Mitsui Chemicals, Inc.

Mitsui Toatsu Chemicals, Incorporated

Kan Ikeda

Masahiro Ohta

Shoji Tamai

Naoki Sato

Wataru Yamashita

Shoji Obuchi

Hiroaki Matsuno

The invention is a degradable polyurethane resin obtained by reacting 2,5-/2,6-diisocyanatomethylbicyclo&lsqb;2.2.1&rsqb;heptane and/or a modified compound thereof with polyol comprising a single compound, mixture or copolycondensate selected from the group consisting of (A) polyhydroxycarboxylate polyol, (B) aliphatic polyester polyol and (C) saccharides, or (D) straight or branched polyol formed by condensation of (A) and/or (B) with aliphatic polyhydric alcohol having functionality of three or more, and the polyurethane resin has hydralyzability and biodegradability, is excellent in rigidity and elasticity in combination with flexibility as compared with conventionally known biodegradable resin, and can provide formed articles having outstandingly high elasticity and elongation and other unprecedented properties.

Degradable polyurethane resin

A preparation process of isoimide comprising reacting a compound having one or more carboxyl group and one or more amide bond in the same molecule in the presence of a haloiminium salt and basic substance, and a preparation process of isoimide comprising reacting a compound having one or more carboxyl group with a compound having one or more amide bond in the presence of a haloiminium salt and basic substance are disclosed.

Process for preparing isoimides

A preparation process of solid polyhydroxycarboxylic acid comprising subjecting an organic solvent solution of polyhydroxycarboxylic acid to cooling.cndot.solidification and grinding. The preparation process can provide high molecular weight solid polyhydroxycarboxylic acid with ease and cheaply, can be converted with ease to a continuous system, and is useful in industry.

Preparation process of polyhydroxycarboxylic acid

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Fukuoka-ken, Japan

Kan Ikeda