A method for manufacturing poly(2-hydroxyalkanoic adic), and the poly(2-hydroxyalkanoic acid) obtainable thereby

• Main Authors: COSTA LIBORIO IVANO, LOVIAT FRANCOIS
• Format: Patent
• Language: Chinese; English
• Published: 13.07.2016
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A method for manufacturing poly(2-hydroxyalkanoic acid), preferably a poly(lactic acid), is disclosed. The method comprises the steps of: mixing a cyclic diester of a 2-hydroxyalkanoic acid and a polymerization catalyst, polymerizing the cyclic diester to form poly(2-hydroxyalkanoic acid) in liquid phase, adding a peroxide-based compound as a catalyst deactivating agent to the liquid phase, applying a devolatilisation step to the liquid phase, and allowing the poly(2-hydroxyalkanoic acid) to solidify, characterized in that an end-capping agent is added to the poly(2-hydroxyalkanoic acid) in the liquid phase. The present invention also relates to a poly(2-hydroxyalkanoic acid), preferably a poly(lactic acid), obtainable with said method characterized in that the polymer has a Mn abs ranging between 10000 and 250000 g/mol, preferably between 20000 and 85000 g/mol. 本发明公开了种用于制造聚(2?羟基链烷酸)，优选聚(乳酸)的方法。该方法包括以下步骤：混合2?羟基链烷酸的环状二酯和聚合催化剂，使环状二酯聚合以形成液相的聚(2?羟基链烷酸)，向该液相中添加过氧化物基化合物作为催化剂去活化剂，对该液相施以脱挥发分步骤，并使聚(2?羟基链烷酸)固化，其特征在于将封端