Lightsafe masking film

DETAILED DESCRIPTION What is claimed is: 1.
A lightsafe masking film comprising a transparent substrate, and a transparent, lightsafe layer peelably provided over the surface of said substrate and containing a yellow colorant capable of blocking light having a wavelength of 480 nm or less and a blue colorant so that (a) the color of the lightsafe layer is greenish, (b) the light transmissivity of the lightsafe layer is maximum at a wavelength of 540-570 nm, (c) the lightsafe layer can block light having a wavelength of 480 nm or less, and (d) the lightsafe layer has such a light transmission characteristic that the ratio of the integral light transmissivity in the wavelength range of 480-600 nm to that in the wavelength range of 480-700 nm is 0.
6 or more.
2.
A lightsafe masking film as claimed in claim 1, wherein the ratio of the integral light transmissivity in the wavelength range of 480-600 nm to that in the wavelength range of 480-700 nm is 0.
8 or more.
3.
A lightsafe masking film as claimed in claim 1, further comprising a pressure sensitive adhesive layer provided between said substrate and said lightsafe layer.
4.
A lightsafe masking film as claimed in claim 3, wherein said pressure sensitive adhesive layer comprises a synthetic resin adhesive or a rubber adhesive.
5.
A lightsafe masking film as claimed in claim 4, wherein said lightsafe layer further contains a nitrile rubber, a nitrocellulose and a plasticizer.
6.
A lightsafe masking film comprising a transparent substrate, and a transparent, lightsafe layer peelably provided over the surface of said substrate and containing a light yellow colorant and a blue colorant so that the color of the lightsafe layer is light green and the lightsafe layer can block light having a wavelength of 450 nm or less, said lightsafe layer further containing a UV ray absorbing substance.
7.
A lightsafe masking film as claimed in claim 6, wherein said UV ray absorbing substance is of benzophenone or a substituted benzophenone.
8.
A lightsafe masking film as claimed in claim 6, wherein the spectral transmittance of said lightsafe layer has a peak between a wavelength of 530-570 nm