Patent ID: 7645810
Filing Date: 2010-01-12
Classification: C08J,Y10T

Abstract:
1. An extruded foamed sheet of a base resin comprising at least 50% by weight of a polylactic acid resin modified to give said extruded foamed sheet a half crystallization time of 2 to 200 seconds at 110° C., said foamed sheet having an apparent density of 63 to 630 kg/m 3 , a thickness of 0.5 to 7 mm and endothermic and exothermic calorific values of ΔH endo:2 and ΔH exo:2 , respectively, as measured by heat flux differential scanning calorimetry at a heating rate of 2° C./min, wherein the endothermic calorific value ΔH endo:2 is at least 10 J/g and the difference (ΔH endo:2 −ΔH exo:2 ) between the endothermic calorific value ΔH endo:2 and the exothermic calorific value ΔH exo:2 is less than 20 J/g.