| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a polylactic acid resin composition improved in heat resistance and anti-hygrothermal property, suitable for material recycling and controlled in the lowering of heat resistance of the resin composition at remelting of moldings. <P>SOLUTION: This polylactic acid resin composition satisfies the following conditions (a) to (c) simultaneously: (a) the difference of the melting points before and after the temperature raising and lowering operation when repeating it three times between 25-260°C at 20°C/minute in an N<SB>2</SB>atmosphere is not greater than 15°C, (b) the reduced viscosity lowering rate after retention for 100 hours under a condition of 80°C and 95% RH is not greater than 30%, and the (c) stereo complex crystallinity degree (S) represented by the formula: S(%)=[ΔHms/(ΔHms+ΔHmh)]×100% is not smaller than 80%. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
