Nishikawa Rubber Co., Ltd.

Toru Yano

Junzo Otera

Nobuyuki Sakuda

Hirokazu Yamamoto

The present invention relates a biodegradable resin composition comprising an L-lactic acid unit-containing resin (1) and a D-lactic acid unit-containing resin (2). Also disclosed is a biodegradable resin molded article obtained from the biodegradable resin composition.

Biodegradable resin composition and biodegradable resin molded article

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

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.

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Hiroshima, Japan

Toru Yano