Toyo Boseki Kabushiki Kaisha

Shigetomo Yamamoto

Yukinobu Mukoyama

Masayuki Haruta

Katsuhiko Nose

Kenji Kawai

Masatoshi Hashimoto

Kyoko Inagaki

Masakazu Iwasaki

Disclosed is a void-containing heat-shrinkable polyester film which is composed of at least two layers, wherein at least one of the layers is a polyester resin layer comprising a cyclic polyolefin resin and containing voids. The film has an apparent specific gravity of less than 1.00 and has specified heat shrinking properties and mechanical properties. Also disclosed is a void-containing heat-shrinkable polyester film as mentioned above, which exhibits specified cuttability along a perforation. Further disclosed is a process for producing a void-containing heat-shrinkable polyester film as mentioned above.

Void-containing heat-shrinkable polyester film and process for production thereof

The inventive heat-shrinkable polyolefin film is high in shrinkability in the longitudinal direction that is its main shrinkage direction and excellent in finish properties after shrinkage, perforated line openability, and thermal blocking resistance. The heat-shrinkable polyolefin film is characterized by particular values with respect to hot-water heat shrinkage ratio in the longitudinal and width directions, right angle tear strength in the width direction, and heat-resistant peel strength.

Heat shrinkable polyolefin film and process for producing the same

Growing community of inventors

Inuyama, Japan

Shigetomo Yamamoto