| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a protective film having a polylactic acid-based substrate material, which prevents its substrate material from melting or deforming even at a high temperature exceeding 100°C, and also which prevents breakage or tearing from occurring during producing or processing the protective film, when rolled into a roll form and the like. <P>SOLUTION: The protective film, having a repeelable adhesive layer on at least one side of the substrate material, includes the polylactic acid-based film or a sheet that configures the substrate material, wherein the substrate material contains: the polylactic acid (A); and 5 to 30 pts.wt. of soft aliphatic polyester (B) based on 100 pts.wt. of polylactic acid (A). The melting endothermic value ΔHc' associated with a crystallizing section on film formation and obtained by the formula (1): ΔHc'=ΔHm-ΔHc is ≥10 J/g. In the formula (1), ΔHc is the exothermic value (J/g) associated with the crystallization during the temperature-elevating process for the film or sheet after film formation and measured by DSC, and ΔHm is the endothermic value (J/g) associated with the melting thereafter. <P>COPYRIGHT: (C)2012,JPO&INPIT |
