Heat-shrinkable polyester film

A heat-shrinkable polyester film being produced from a first polyester resin and a second polyester resin the first and second polyester resins having different crystallinity,

• 90% or more by weight of the film being produced from the first and second polyester resins,
• a weight-based mixing proportion of the first polyester resin/second polyester resin having a value within the range of 20/80 to 80/20,
• wherein the heat-shrinkable polyester film satisfies the following characteristics (A) to (E):
• (A) the first polyester resin is an amorphous polyester resin that is a reaction product of a first polyvalent carboxylic acid and a first polyalcohol,
• the first polyvalent carboxylic acid comprises terephthalic acid, when a total amount of the first polyvalent carboxylic acid is taken as 100 mol %, terephthalic acid is 90 mol % or more,
• the first polyalcohol comprises ethylene glycol, 1,4-cyclohexanedimethanol and/or diethylene glycol, and when a total amount of the first polyalcohol is taken as 100 mol %, ethylene glycol is 50 mol % or more and below 90 mol %, the remaining balance of the first polyalcohol is 1,4-cyclohexanedimethanol and/or diethylene glycol;
• (B) the second polyester resin is a crystalline polyester resin that is a reaction product of a second polyvalent carboxylic acid and a second polyalcohol,
• the second polyvalent carboxylic acid comprises terephthalic acid, when a total amount of the second polyvalent carboxylic acid is taken as 100 mol %, terephthalic acid is 90 mol % or more,
• the second polyalcohol comprises ethylene glycol, and when a total amount of the second polyalcohol is taken as 100 mol %, ethylene glycol is 90 mol % or more;
• (C) the heat-shrinkable polyester film is a heat-shrinkable polyester film in which when isothermal crystallization measurement at 150° C., including a cooling process at a constant temperature, is performed by DSC, an exothermic peak appears within 12 minutes from the start, including the cooling process time;
• (D) the heat-shrinkable polyester film is a heat-shrinkable polyester film in which when isothermal crystallization measurement at 150° C., including a cooling process at a constant temperature, is performed by DSC, a heat quantity corresponding to an obtained exothermic peak area is within the range of 5 to 35 J/g;
• and
• (E) the heat-shrinkable polyester film is a heat-shrinkable polyester film in which a thermal shrinkage ratio in a main shrinkage direction as measured under thermal shrinkage conditions of being immersed in hot water at 80° C. for 10 seconds, is within the range of 20% to 60%.