| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating protection for a printed board that is difficult to be yellow-discolored even through a surface packaging step, high in reflectance and excellent in structural strength and has high temperature heat resistance and high reflectance.SOLUTION: A coating protection film has a polymer thin film having high temperature heat resistance that has two side surfaces, a thickness of 2 micrometers to 125 micrometers, and a melting point higher than 260°C, a polymer composite material layer having high reflectivity which has a first reflection coating material of 1 or more in refractive index, is provided to one side surface of the polymer thin film having the high temperature heat resistance and has a thickness of 2 micrometers to 30 micrometers, and an adhesive layer which is provided to a side surface of the polymer thin film having the high temperature heat resistance at the opposite side to the polymer composite material layer having the high reflectivity, and has a thickness of 10 micrometers to 75 micrometers. In a spectrum having the whole reflectivity of 89% or more, the absorbance of the polymer thin film having the high temperature heat resistance is equal to 35% or less. |
