| 摘要 |
PROBLEM TO BE SOLVED: To provide a polylactic acid resin composition capable of efficiently providing an injection foamed body having excellent heat resistance and good strength and an injection foamed body using the resin composition.SOLUTION: There is provided a polylactic resin composition for injection foaming mainly containing a polylactic resin (A) having a D body content of 2 mol% or less and satisfying following conditions (1) to (3) at the same time. (1) Melt viscosity measured at 190°C is 20 to 200 mN. (2) Melting viscosity (MFR-1) measured under the condition at 190°C and 21.6 N is 0.1 to 20 g/10 min. and a ratio to melting viscosity (MFR-2) measured under the condition at 190°C and 132.25 N, (MFR-2/MFR-1), is 15 or more. (3) A ratio between slope of linear area in an elongation initial stage until the appearance of an inflection point, a1, and slope of elongation latter stage after the inflection point, a2, in a time-elongation viscosity curve obtained by an elongation viscosity measurement at a temperature higher than the melting point by 10°C, (a2/a1, distortion curing coefficient) is 1.2 to 20. |
