resina baseada em ácido poliláctico; processo para produção de resina baseada em ácido poliláctico; composição de resina de ácido poliláctico; composição de resina de ácido poliláctico estereocomplexo e processo para produção de uma composição de resina de ácido poliláctico estereocomplexo

摘要

The invention provides a polylactic acid-based resin having a high molecular weight, high heat resistance and an amide bond in its molecular chain, a production process and a use thereof. The polylactic acid-based resin comprises a constituting unit represented by the following formula (1) and which is obtained by allowing a polyisocyanate compound to react with a mixture comprising at least a poly (L-lactic acid) in which the percentage of the terminal functional group which is a carboxyl group exceeds 50% and a poly(D-lactic acid) in which the percentage of the terminal functional group which is a carboxyl group exceeds 50%.
(in the formula (1), R is a polyisocyanate residue and represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms, a hydrocarbon group having an alicyclic structure and 3 to 20 carbon atoms or a hydrocarbon group having an aromatic ring and 6 to 20 carbon atoms.)