| 摘要 |
<p>PROBLEM TO BE SOLVED: To prepare a poly(lactic acid) sheet excellent in moldability. SOLUTION: A poly(lactic acid) polymer with a weight-average molecular weight ranging from 60,000 to 700,000 is used to produce a poly(lactic acid) sheet having the relation between the heat of crystallizationΔTc and the heat of melting of the crystalΔHm satisfying (ΔHm-ΔHc)/ΔHm <=0.7, when the sheet is heated to increase its temperature. The poly(lactic acid) polymer with a weight-average molecular weight ranging from 60,000 to 700,000 is used to also give a poly(lactic acid) sheet having no crystallization, point Tc and the melting point Tm.</p> |
