Patent ID: 6875485

Claim:
A film for heat-shrinkable polypropylene shrink label comprising a resin composition which comprises from 50 to 95% by weight of a crystalline propylene-α-olefin random copolymer mainly comprising propylene, the copolymer satisfying the following requirements (1) to (3); and from 5 to 50% by weight of an alicyclic hydrocarbon resin having a softening temperature of 110° C. to 140° C.: Requirement (1): The copolymer exhibits a melt flow rate of from 0.5 to 10 g/10 min at a temperature of 230° C. and a load of 2.16 kg; Requirement (2): The copolymer exhibits a main fusion peak temperature (Tp) of from 100° C. to 140° C. as determined by means of a differential scanning calorimeter (DSC); and Requirement (3): The copolymer exhibits T 50 of not higher than 125° C. with the proviso that T 50 is a temperature (° C.) at which an amount of heat of fusion is 50% of ΔHm wherein ΔHm is a total amount of heat of fusion of the copolymer as determined by DSC, wherein in a dynamic viscoelasticity measurement, at least one peak of loss tangent (tan δ) measured at a frequency of 1 Hz and a strain of 0.1% is observed at the range of from 30° C. to 100° C., and a peak value thereof is not smaller than 0.10, in which the film has been stretched at least monoaxially at a draw ratio of not smaller than 2, and shrinks in the main shrinking direction at a shrinkage rate satisfying the following relationships (1) to (3), exhibits a specific gravity of not greater than 0.95, and shrinks at a shrinkage rate of less than 3% at a temperature of 40° C. in 7 days: S 80 >251 d− 215 Relationship (1): S 90 >531 d− 462 Relationship (2): S 100 >627 d− 541 Relationship (3): wherein S 80 , S 90 and S 100 are shrinkage rates (%) in the main shrinking direction determined when dipped in a hot water bath at 80° C., 90° C. and 100° C., respectively, for 10 seconds; and d is the specific gravity of the film for shrink label.