C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/06 (2006.01) C08G 63/83 (2006.01) C08G 63/85 (2006.01)
Patent
CA 2223369
The present invention provides a process for producing polyhydroxycarboxylic acids which comprises subjecting at least one hydroxycarboxylic acid or oligomer thereof to polycondensation in the presence of an alkali metal compound, an alkaline earth metal compound, or a compound of a metal of Group IIIb of the periodic table. The polyhydroxycarboxylic acids obtained by the process have a weight-average molecular weight of 30,000 or above and are useful as biodegradable plastics for food-wrapping films, drug delivery systems, etc.
La présente invention décrit un procédé pour produire des acides polyhydroxycarboxyliques qui comprend la polycondensation d'au moins un acide hydroxycarboxylique ou d'un oligomère de ce dernier en présence d'un composé de métal alcalin, d'un composé de métal alcalino-terreux ou d'un composé d'un métal du Groupe IIIb du tableau périodique. Les acides polyhydroxycarboxyliques obtenus par ce procédé ont un poids moléculaire pondéral moyen de 30 000 ou plus et sont utiles comme plastiques biodégradables pour diverses applications : pellicules pour l'emballage des aliments, systèmes d'administration de médicaments, etc.
Maruyama Hiroshige
Murayama Toshikazu
Tsuzaki Nobuko
Yanagisawa Norio
Goudreau Gage Dubuc
Kyowa Yuka Co. Ltd.
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