| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for giving an anti-folding property to a lactic acid-based polymer sheet hardly causing bleeding-out and having excellent flexibility, transparency and impact resistance. SOLUTION: A manufacturing method of a lactic acid-based polymer sheet comprises a process of heating and melting a polyester composition containing an impact resistance-donating agent (IV) composed of a lactic acid-based polyester (III) having a lactic acid unit (I) and a polyester unit (II), the ratio being 10:90 to 90:10 by weight, weight average molecular weight of not less than 10,000 and a glass transition temperature of not higher than 60 deg.C and a polyhydroxycarboxylic acid (V) and a process of forming a sheet by blowing air to at least one surface of the sheet to cool and solidify the sheet.
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