Patent ID: 8062574
Filing Date: 2011-11-22
Classification: B29C,C08J,C08K,Y02P

Abstract:
1. A method of manufacturing a polylactic acid resin injection molded article, wherein the expansion ratio of the polylactic acid resin injection molded article is 1.05 times or less, said method having the following step (1) and step (2): step (1): a step of melt-kneading a polylactic acid resin composition while contacting the composition with a supercritical fluid, wherein the composition comprises a polylactic acid resin and at least one organic crystal nucleus agent selected from the group consisting of an aliphatic amide compound having at least one hydroxyl group in the molecule, an aliphatic ester compound having at least one hydroxyl group in the molecule, a metal salt of phenylphosphonic acid, a carbohydrazide, a melamine compound, an uracil, an N-substituted urea, and an organic pigment, wherein the organic pigment comprises (a) a cyclic compound having C═O and a functional group selected from NH and O in the molecule, (b) a mixture of a cyclic compound having C═O in the molecule and a cyclic compound having a functional group selected from NH, S and O in the molecule, (c) a phthalocyanine compound which may be substituted and contain a metal, and/or (d) a porphyrin compound which may be substituted; and step (2): a step of filling the melted product obtained in step (1) in a die to mold with injection-molding.