HEAT-SHRINKABLE POLYLACTIC ACID LAMINATED FILM

摘要

PROBLEM TO BE SOLVED: To provide a heat-shrinkable polylactic acid laminated film mainly comprising a polylactic acid polymer, improved in biodegradability and transparency and also excellent in breaking resistance. SOLUTION: A uniaxially or biaxially stretched heat-shrinkable polylactic acid laminated film is obtained by laminating an outside layer containing polylactic acid as a main component on the outside of a center layer comprising polylactic aid, an aliphatic polyester resin and a plasticizer. The aliphatic polyester resin constituting the center layer has Tg of 0°C or below and is contained in an amount of 10-25 wt.%. The solubility parameter (SP value) of the plasticizer is near to the SP value of the aliphatic polyester resin as compared with the intermediate value of the SP values of the polylactic acid polymer and the aliphatic polyester resin and the content of the plasticizer is 1-15 pts. mass. The outside layer contains 90 wt.% or above of the polylactic acid polymer. COPYRIGHT: (C)2004,JPO&NCIPI