PROTECTIVE FILM FOR OPTICAL DISK AND OPTICAL DISK USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a protective film for an optical disk which is used for protecting an information recording layer of the optical disk and does not hinder the recording and reproducing functions of the information of the optical disk and the optical disk using the same.

SOLUTION: The protective film for the optical disk having an acrylic tacky adhesive layer on one surface of a light transparent base material film formed by using a film which is ≤10% in the change rate (X) of transmittance expressed by the relation [1] X(%)=[(Ta-Tb)/Ta]×100...[1] by defining the initial transmittance to light of a wavelength 405 nm of the protective film for the optical disk as Taand the transmittance to the light of the wavelength after leaving for 1,000 hours under the environment of 80°C and relative humidity 85% as Tband is ≤10 ppm respectively in the amounts of elution of the halogen ions and alkaline ions in the acrylic tacky adhesive forming the acrylic tacky adhesive layer and the optical disk using such protective film.

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