POLYLACTIC ACID COPOLYMER AND METHOD FOR PRODUCING SAME

A polylactic acid copolymer having more improved hydrolizability and hydrophilic property than those of the polylactic acid. The polylactic acid copolymer is obtained by the copolymerization of a polylactic acid with an acid-releasing ester polymer capable of releasing an acid other than the lactic...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHIKAWA, Seishi, KATAYAMA, Tsutaki, SHIBATA, Kouki
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	A polylactic acid copolymer having more improved hydrolizability and hydrophilic property than those of the polylactic acid. The polylactic acid copolymer is obtained by the copolymerization of a polylactic acid with an acid-releasing ester polymer capable of releasing an acid other than the lactic acid upon the hydrolysis. The polylactic acid copolymer has a quantity of heat of fusion ΔH of not more than 20 J/g as measured by using the DSC when the temperature is elevated the second time, contains the copolymer units stemming from the acid-releasing ester polymer in an amount of 0.5 to 35% by mass, and has a weight average molecular weight in a range of 15,000 to 40,000.