THERMALLY SHRINKABLE POLYESTER-BASED FILM FOR HONEYCOMB MATERIAL

PROBLEM TO BE SOLVED: To prepare a thermally shrinkable polyester-based film which is used for honeycomb materials, has good heat resistance and excellent shape stability, especially little causes shrinkage unevenness, gives an excellent shrinkage result in one direction shrinkage, can be processed with a solvent, and can hence produce precise honeycomb materials in high efficiency. SOLUTION: This thermally shrinkable polyester-based film for the honeycomb materials is characterized by containing neopentyl glycol and/or cyclohexane dimethanol as a glycol component constituting the polyester of raw material for the thermally shrinkable film, and having the maximum thermal shrinkage factor of ≥5%, preferably ≥30%. The thermally shrinkable polyester-based film for the honeycomb materials preferably has the minimum thermal shrinkage factors in the main shrinking direction and in the crossing direction in a temperature range of 55 to 105°C, has a cross point shrinkage factor of ≥2%, and can be adhered to the adjacent film. COPYRIGHT: (C)2005,JPO&NCIPI