Patent ID: 8137773

Claim:
A polyolefin series heat-shrinkable film comprising: a mixed resin layer comprising a polyolefin series resin (A), a polylactic acid series resin (B), and a resin (C) facilitating compatibility with said polyolefin series resin (A) and said polylactic acid series resin (B), wherein a mass ratio of the polyolefin series resin (A) to the polylactic acid series resin (B) is: (A)/(B)=99/1 to 70/30, and a pair of surface-and-backside layers comprising the polylactic acid series resin (B) as a main component and a rubber component other than the polylactic acid series resin (B) placed on both sides of the mixed resin layer comprising the polyolefin series resin (A), the polylactic acid series resin (B), and the resin (C), wherein a heat shrinkage ratio of said film at least in one direction when dipped in hot water at 80° C. for 10 seconds is 20% or more, a natural shrinkage ratio of said film when stored at 40° C. under 50% RH environment for 7 days is less than 10%.