OLIGOMER PRECIPITATION SUPPRESSION ADHESIVE LAYER OF STUCK LAMINATED PET FILM

摘要

PROBLEM TO BE SOLVED: To provide a transparent electrode sheet which suppresses the precipitation of an oligomer even if an application layer or a coating layer is not formed on a PET surface at an adhesive layer side.SOLUTION: A touch panel sheet is pre-annealed by heat-shrinking first and second resin films 1 and 2 in advance before being annealed in order to prevent heat shrinkage when annealed in a manufacturing process. When temperatures of the first and second resin films 1 and 2 become at least a glass transition temperature by the pre-annealing, the oligomers in the first and second resin films 1 and 2 are precipitated and diffused. The oligomer which passes the interface between the first and second resin films 1 and 2 and the adhesive layer 3 and moves to the adhesive layer 3 from the first and second resin films 1 and 2 is not admixed with the adhesive layer 3 formed of polyethylene containing a terephthalic acid and ethylene glycol and not precipitated as a crystal. The oligomer has an optical refractive index almost equal to that of the adhesive layer 3 to be invisible although it is not admixed with the adhesive layer 3.