LACTIC ACID POLYMER COMPOSITION IMPROVED IN PHYSICAL PROPERTY AND ITS PRODUCTION

PROBLEM TO BE SOLVED: To efficiently obtain a composition useful as a biodegradable plastic molding material excellent in flexibility at a low cost by refluxing a lactide generated as a by-product during the reaction process to the reaction system. SOLUTION: This lactic acid polymer composition cont...

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Hauptverfasser:	KOYANAGI KUNIHIKO, HASHIMOTO NORIAKI, SAKAI TADAKI, MIYOSHI RIKA, SUMIHIRO YUKIHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To efficiently obtain a composition useful as a biodegradable plastic molding material excellent in flexibility at a low cost by refluxing a lactide generated as a by-product during the reaction process to the reaction system. SOLUTION: This lactic acid polymer composition containing lactic acid polymer of a weight-average mol.wt. of 50,000-200,000 and a solvent high in a vacuum boiling point is obtained by polycondensing lactic acid in the solvent, while a lactide generated as a by-product during the reaction process is refluxed to the reaction system. The solvent is the one having a boiling point of 250-350 deg.C under the atmospheric pressure, e.g. dibutyl phthalate, and is preferably added in an amount of 5-25 pts.wt. per 100 pts.wt. of the lactic acid oligomer.