Patent ID: 9637606
Date: 2017-05-02
CPC Classifications: C08J

Claim:
1. A polylactic acid-based resin foamed molded article having interconnected void spaces and comprising a multiplicity of polylactic acid-based resin expanded beads that are fusion-bonded to each other to define the interconnected void spaces therebetween, said foamed molded article having a voidage of 10 to 45% by volume, a bulk density BD [g/cm said polylactic acid-based resin expanded beads showing at least one high temperature peak having a peak top temperature higher than a reference temperature and at least one low temperature peak having a peak top temperature equal to or lower than the reference temperature on a first heating run DSC curve obtained when a measurement samples from the polylactic acid-based resin expanded beads is heated from 23° C. to a first temperature higher by 30° C. than a fusion peak ending temperature at a heating speed of 10° C./min according to heat flux differential scanning calorimetry referenced in JIS K7122(1987), wherein said reference temperature is a peak top temperature of an endothermic peak that is located on the highest temperature side on a second heating run DSC curve obtained when the measurement sample, after having been maintained at said first temperature for 10 minutes and then cooled to 30° C. at a cooling speed of 10° C./min, is heated from 30° C. to a second temperature higher by 30° C. than a fusion peak ending temperature at a heating speed of 10° C./min according to heat flux differential scanning calorimetry referenced in JIS K7122(1987), wherein when the second time DSC curve has only one fusion peak, said reference temperature is a peak top temperature thereof, and when the second time DSC curve has a plurality of fusion peaks or when there is a shoulder on high temperature side of a fusion peak, said reference temperature is the highest among the peak top temperatures of the plural fusion peaks and flection point temperatures of the shoulders, wherein the polylactic acid-based resin expanded beads have a closed cell content of at least 80%, and wherein said expanded beads showing an endothermic calorific value of (Br:endo) [J/g], when a measurement sample of said expanded beads is heated, after having been subjected to a pretreatment, by heat flux differential scanning calorimetry from 40° C. at a heating speed of 2° C./min in accordance with JIS K7122(1987), said pretreatment including maintaining the measurement sample at a temperature higher by 30° C. than a fusion peak ending temperature thereof for 10 minutes, then cooling the molten measurement sample to 110° C. at a cooling speed of 2° C./min, then maintaining the cooled measurement sample at 110° C. for 120 min, and then cooling the resulting measurement sample to 40° C. at a cooling speed of 2° C./min, and wherein (Br:endo) meets the following equation (1):