To provide a molding material for a packaging film which is formed of a specific block copolymer resin composition and has excellent heat shrinking property, tear break resistance, and transparency; and a heat shrinkable film for packaging.
The heat shrinkable film for packaging is formed of the block copolymer resin composition. In the block copolymer resin composition, which is a copolymer of a vinyl aromatic hydrocarbon and a conjugated diene, a mass ratio of the vinyl aromatic hydrocarbon to the conjugated diene is 80/20 to 60/40, a weight-average molecular weight is 50,000-200,000, and at least one loss tangent peak is obtained at -30°C or lower in the dynamic viscoelasticity measurement. In the heat shrinkable film for packaging, a longitudinal shrinkage percentage at 120°C is 20% or more, tear strength is 50 N/mm or more, a break displacement is 10 mm or more, and the haze degree is less than 10%.
ITO KATSUMI
OISHI MASAYUKI
