HEAT-SHRINKABLE POLYESTER FILM AND PROCESS FOR PRODUCING THE SAME

• Main Authors: NOSE KATSUHIKO, ENDO TAKURO, HASHIMOTO MASATOSHI
• Format: Patent
• Language: English; Korean
• Published: 10.09.2010
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

[Problems] A heat-shrinkable polyester film is provided which exhibits a high shrinkability in a high-temperature range with a main shrinking direction oriented in a longitudinal direction thereof, though not shrinking in the longitudinal direction in a low-temperature range, possesses an extremely high mechanical strength in a transverse direction orthogonal to the main shrinking direction, and in particular, can be utilized suitably as a film for forming a jacket label of a battery or similar applications. [Means for solution] A heat-shrinkable polyester film according to the present invention has a main shrinking direction oriented in a longitudinal direction thereof. A ratio of hot-water thermal shrinkage in the longitudinal direction responsive to treatment in hot water at 80°C for 10 seconds, and ratios of thermal shrinkage in the longitudinal direction and thermal shrinkage in the transverse direction responsive to treatment in a glycerin bath at 140°C for 10 seconds are adjusted so as to fall within predetermined ranges, respectively. [Chosen drawing] None