| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a biodegradable polylactic acid based shrink sheet-like article having a sufficient shrink rate; and to further provide a biodegradable polylactic acid based shrink sheet-like article, when used as a label for a beverage bottle, not fusing together with other labels upon sterilization by heating. <P>SOLUTION: The sheet-like article formed from a biodegradable polymer having a polylactic acid based polymer as a main ingredient has a crystal melting calorie (▵Hm) of the polylactic acid based polymer of 5-45 J/g. When the sheet-like article is heated up, a difference between the above ▵Hm and a calorie of crystallization (▵Hc) generated by the crystallization of the polylactic acid based polymer, which is an ingredient of the biodegradable polymer forming this sheet-like article, that is, ▵Hm-▵Hc is 5-32 J/g. <P>COPYRIGHT: (C)2007,JPO&INPIT |
