Patent ID: 9206296
Filing Date: 2015-12-08
Classification: C08J,Y10T

Abstract:
1. An expanded bead of a base resin including a polylactic acid resin, comprising: an exterior surface, a surface region including an entirety of the exterior surface and having a weight of one-sixth to one-fourth the weight of the expanded bead, and a center region located inside the surface region and having a weight of one-fifth to one-third the weight of the expanded bead, wherein the center region comprises a polylactic acid resin and the surface region comprises another different polylactic acid resin; wherein said expanded bead, said surface region and said center region show endothermic calorific values of (Br:endo) J/g, (Brs:endo) J/g and (Brc:endo) J/g, respectively, when specimens of said expanded bead, said surface region and said center region are each measured, after having been subjected to a pretreatment, by heat flux differential scanning calorimetry at a heating speed of 2° C./min in accordance with JIS K7122 (1987), said pretreatment including maintaining the specimen at a temperature higher than 30° C. than a melt completion temperature thereof for 10 minutes, then cooling the molten specimen to 110° C. at a cooling speed of 2° C./min, then maintaining the cooled specimen at 110° C. for 120 min, and then cooling the resulting specimen to 40° C. at a cooling speed of 2° C./min, and wherein (Br:endo), (Brs:endo) and (Brc:endo) meet the following equations (1) and (2):