Heat-shrinkable film, heat shrink label, and package

A heat-shrinkable film which satisfies requirements (1) to (8) below:

• (1) the heat-shrinkable film has a glass transition temperature (Tg) of 90° C. or higher and 140° C. or lower;
• (2) the heat-shrinkable film has a shrinkage of 12% or less in a main shrinkage direction of the heat-shrinkable film when treated in glycerin at 80° C. for 10 seconds;
• (3) the heat-shrinkable film has a shrinkage of 12% or less in a direction orthogonal to the main shrinkage direction of the heat-shrinkable film when treated in glycerin at 140° C. for 10 seconds;
• (4) the heat-shrinkable film has a shrinkage of 30% or more and 80% or less in the main shrinkage direction of the heat-shrinkable film when treated in glycerin at 140° C. for 10 seconds;
• (5) the heat-shrinkable film has a tensile elongation at break of 10% or more both in the main shrinkage direction and in the direction orthogonal to the main shrinkage direction of the heat-shrinkable film after an aging of 672 hours under an atmosphere of a temperature of 50° C. and a relative humidity of 70%;
• (6) the heat-shrinkable film has a difference of 5% or less between a shrinkage at 140° C. in the main shrinkage direction of the heat-shrinkable film after the aging of 672 hours under an atmosphere of a temperature of 50° C. and a relative humidity of 70%, and a shrinkage at 140° C. in the main shrinkage direction of the heat-shrinkable film before the aging;
• (7) the heat-shrinkable film is a polyester film or a cyclic polyolefin film, wherein the polyester film contains a dicarboxylic acid component, a diol component, and a second alcohol component different from the diol component, wherein the dicarboxylic acid component constituting the polyester film is terephthalic acid and/or 2,6-naphthalenedicarboxylic acid, the diol component constituting the polyester film is a ethylene glycol component, wherein the second alcohol component is at least one selected from the group consisting of 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 2,2-diethyl-1,3-propanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,5-pentanediol, 1,9-nonanediol, 1,10-decane diol, 1,4-cyclohexane dimethanol, and diethylene glycol, and wherein the cyclic polyolefin film contains a norbornene or a tetracyclododecane unit as a cycloolefin unit and a non-cyclic olefin monomer unit as a copolymerization unit and
• (8) the polyester film contains 33 mass % or more and 57 mass % or less of a component derived from polyethylene naphthalate in the 100 mass % of polyester film.