JPS6211945Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive sheet or tape capable of blocking light having a wavelength that sensitizes photosensitive materials.

Traditionally, in fields that deal with photosensitive materials, such as those related to printing using photolithography, it is necessary to combine photographs,
Red-colored sheets and tape are used to combine negative or pozo images into one plate during printing, but it is difficult to view the negatives through the red-colored sheet. It has the disadvantage of being difficult to see.

In view of the above-mentioned drawbacks, the present invention was devised to provide a light-shielding adhesive sheet or tape that can block light of wavelengths that sensitize photosensitive materials and has high transmittance for visible light. A light-shielding adhesive sheet or a light-shielding adhesive sheet in which a yellow layer containing a yellow dye and an ultraviolet absorber that absorbs light in the wavelength range of 250 to 390 mm is laminated on one side of a synthetic resin film, and an adhesive layer is laminated on the other side. Exists on tape.

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a sectional view showing an example of the light-shielding adhesive sheet or tape of the present invention. Drawing 1 shows a transparent synthetic resin film, 2 is a yellow layer laminated on one side of the film 1, and 3 is an adhesive layer laminated on the other side of the yellow layer.

The synthetic resin film 1 only needs to be transparent, and for example, a film of polyester, polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, etc. is used, and its thickness is preferably 8 to 50 μm from the viewpoint of workability.
More preferably it is 12-30μ.

In the yellow layer 2, the yellow dye and the ultraviolet absorber are polymethyl methacrylate, methyl methacrylate-methyl acrylate copolymer, nitrocellulose,
It is formed by bonding with a polymeric material such as polyvinyl chloride or vinyl chloride-vinyl acetate copolymer.

The yellow dye mentioned above is preferably an oil-soluble one that is generally used for coloring polymeric materials such as synthetic resins, but yellow dye absorbs light of approximately 500 nm or less.
It has a property of having low light absorption ability in the vicinity of 250 to 390 nm, for example, CISolvent Yellow.
14, CI・Solvent Yellow 19, CISolvent
Yellow 21 and the like, and spirit metal complex dyes such as Neozapon Yellow R (trade name, manufactured by BASF) are preferably used.

The above-mentioned ultraviolet absorbers absorb wavelengths in the range of 250 nm to 390 nm, and include salicylic acid esters such as salicylic acid phenyl ester and salicylic acid butyl phenyl ester, 2-(2-hydroxy-5-methylphenyl)benzotriazole, Benzotriazoles such as benzotriazole derivatives, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-
Examples include benzophenones such as 2'-carboxylbenzophenone, and benzotriazoles are preferably used.

The thickness of the yellow layer and the amount of yellow dye and ultraviolet absorber added are not particularly limited, but the light transmittance in the vicinity of 550 nm should be 30 to 80% so that it can be clearly seen through the adhesive sheet or tape of the present invention. is preferable, and the thickness of the layer is preferably 1 to 30μ, more preferably 2 to 10μ,
The amount of yellow dye and ultraviolet absorber added depends on the polymer material.
The amounts are preferably 20 to 60 parts by weight and 2 to 15 parts by weight, respectively, per 100 parts by weight. Further, the amount of the ultraviolet absorber added to 100 parts by weight of the yellow dye is preferably 4 to 80 parts by weight.

The yellow layer 2 and the synthetic resin film 1 are laminated together, and any method may be used for laminating them. For example, the yellow dye, the ultraviolet absorber, and the polymer material may be layered in ethyl acetate, toluene, methyl ethyl ketone, Mix and disperse in a solvent such as methyl isobutyl ketone or acetone to form a synthetic resin film 1.
The method used is to apply it to the surface and dry it.

In order to improve the adhesion between the yellow layer 2 and the synthetic resin film 1, the surface of the synthetic resin film 1 may be subjected to a corona discharge treatment or may be provided with an undercoat layer.

The adhesive forming the adhesive layer 3 is preferably a colorless and transparent pressure-sensitive adhesive, preferably an acrylic adhesive, and has an adhesive strength of 10 to 300 g/25 mm width (JIS
Z-2107), and the thickness of the adhesive layer is preferably 4 to 50 μm, more preferably 5 to 10 μm.

The thickness of the light-shielding adhesive sheet or tape of the present invention is preferably 50μ or less, and more preferably less than 50μ, since if it becomes thick, the shadow of the sheet edge will be reflected on the photograph and it will not be possible to obtain a clear image when used in photolithography. It is 20-40μ.

Further, the adhesive layer may be covered with release paper or may be wound into a roll to prevent the adhesive layer from adhering to other objects. Note that when forming into a roll, it is preferable to perform a mold release treatment on the outer surface of the yellow layer 2.

The structure of the light-shielding adhesive sheet or tape of the present invention is as described above, and the colored layer contains yellow dye and ultraviolet absorber.
Although its ability to absorb light in the vicinity of 250 to 390 nm is low, the UV absorber absorbs light in the vicinity of 250 to 390 nm, and can block light of 500 nm or less that sensitizes photosensitive materials. In addition, yellow dye transmits light well in the visible wavelength range of 500 nm or more, so even if it is coated with a negative or pozo image, it is clearly visible through the adhesive sheet or tape. In addition, since the adhesive layer is laminated, when producing photolithography related to printing, it is possible to see through the pattern from the adhesive sheet or tape and work while adhering and peeling with the adhesive. It has excellent workability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a row of light-shielding adhesive sheets or tapes of the present invention. 1...Synthetic resin film, 2...Yellow layer, 3...
...Adhesive layer.

Claims (1)

[Scope of claims for utility model registration] 1. 250 to 390 on one side of a transparent synthetic resin film.
A light-shielding adhesive sheet or tape consisting of a yellow layer containing an ultraviolet absorber that absorbs light with a wavelength in the mm range and a yellow layer laminated, and an adhesive layer laminated on the other side. 2. The pressure-sensitive adhesive sheet or tape according to claim 1, wherein the yellow layer comprises a yellow dye and an ultraviolet absorber bound together by a polymeric material. 3. The pressure-sensitive adhesive sheet or tape according to claim 1 or 2, wherein the ultraviolet absorber is a benzotriazole.