Toyo Boseki Kabushiki Kaisha

Hiroaki Esaki

Norimi Tabota

Tsutomu Isaka

Tsutomu Oko

Shigeji Konagaya

Kuniharu Mori

Koji Yamada

Seizo Takabayashi

Shinichiro Okumura

Heat-shrinkable polyester films having a heat shrinkability of 30% or more, preferably 40% or more, in the direction of major shrinkage after treatment in hot water at 80.degree. C. for 30 seconds, the ratio of heat shrinkability in the direction of major shrinkage after treatment in hot water at 80.degree. C. for 5 seconds to heat shrinkability in the direction of major shrinkage after treatment in hot water at 80.degree. C. for 30 seconds being 0.8 or less, preferably 0.7 or less. The heat-shrinkable polyester films are suitable for label applications because of their particular heat-shrinkable properties such that not only do they scarcely cause longitudinal sinking when shrunk but also they have very few wrinkles, shrinkage spots and strains remaining after shrinkage.

Heat-shrinkable polyester films

Growing community of inventors

Inuyama, Japan

Hiroaki Esaki