Patent ID: 7279204
Filing Date: 2007-10-09
Classification: B29C,B29K,B29L,C08J,Y10T

Abstract:
1. A heat shrinkable polyester film, which satisfies the following requirements, (A) to (C): (A) when a square test piece cut off from said heat-shrinkable polyester film in a size of 10 cm×10 cm is immersed in hot water at 70° C. for 5 seconds, subsequently in water at 25° C. for 10 seconds, and withdrawn, the heat shrinkage percentage of the test piece in the maximum shrinkage direction is 10 to 50%; (B) when a square test piece cut off from the heat-shrinkable polyester film in a size of 10 cm×10 cm is immersed in hot water at 85° C. for 5 seconds, subsequently in water at 25° C. for 10 seconds, and withdrawn, the heat shrinkage percentage of the test piece in the maximum shrinkage direction is 70% or more and that in the direction orthogonal thereto, 10% or less; and (C) when a square test pieces cut off from the heat-shrinkable polyester film and the film thereof previously 10% heat shrunk in the maximum shrinkage direction in a size of 10 cm×10 cm are immersed in hot water at 95° C. for 5 seconds, subsequently in water at 25° C. for 10 seconds, and withdrawn, the heat shrinkage percentage of the test pieces in the maximum shrinkage direction are designated respectively as X