Patent ID: 8632865

Claim:
A heat-shrinkable polyester film having a heat-shrinkage change per degree Celsius (%/° C.) along the main shrinkage direction of 1.5 to 3.0 in the range of 60° C. to 70° C., 2.5 to 3.5 in the range of 70° C. to 80° C., 1.0 to 2.0 in the range of 80° C. to 90° C., and 0.1 to 1.0 in the range of 90° C. to 100° C., wherein the heat-shrinkable polyester film is prepared by using a copolyester composition comprising: (i) a dibasic acid component comprising at least 90 mol % of terephthalic acid residue based on 100 mol % of the dibasic acid component; and (ii) a diol component comprising (a) 1 to 20 mol % of diethylene glycol, (b) 5 to 30 mol % of neopentyl glycol, and (c) 50 to 90 mol % of ethylene glycol, based on 100 mol % of the diol component.