JP2899021B2 - Shading masking film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a field in which a photosensitive material is used, for example, a light-sensitive wavelength region of a photosensitive material for a light room used in photoengraving is shielded from light and a required portion is removed. The present invention relates to a light-shielding masking film which is useful for producing an original drawing by peeling.

[Prior Art and Problems to be Solved by the Invention] Conventionally, a light-shielding release layer containing a yellow or red colorant is provided on a plastic support as a film for shielding a photosensitive wavelength region of a photosensitive material for a light room. The light-shielding masking film formed in the above is widely used. This light-shielding masking film can be used when making or printing
A cut line is formed in the light-shielding release layer, and the light-shielding release layer is separated from the plastic support along the cut line to obtain a desired transparent image.

In the light-shielding release layer of the light-shielding masking film,
In addition to easy peelability and the like, a light-shielding property for a photosensitive wavelength region of the photosensitive material is required. This light-shielding property is provided based on the absorption wavelength characteristics of the colorant. That is, paying attention to the fact that the photosensitive wavelength region of the light-sensitive material is usually about 400 nm or less, the release layer contains a yellow colorant or a red colorant that absorbs the above wavelength region, and the Is secured.

However, the yellow or red colorant contained in the release layer has a large irritation to the eyes, and when performing a cutting operation for applying a cut line or a long period of time in the release operation, the eyes are easily tired and the working efficiency is reduced. . Further, when producing or printing a composite photograph, it is difficult to see a negative or positive image through a light-shielding masking film, and the workability is reduced.

On the other hand, green-based colors are different from yellow or red-based colors in that they cause little irritation to the eyes. Therefore, when a green colorant is contained in the release layer, eye fatigue can be reduced. However, since the absorption wavelength region of the green colorant is generally 480 to 560 nm, it is difficult to shield light having a wavelength of about 400 nm or less, which is the photosensitive wavelength region of the photosensitive material.

Accordingly, an object of the present invention is to provide a light-shielding masking film that is excellent in light-shielding properties even when colored in a green system color that can reduce eye fatigue.

[Constitution of the Invention] The present invention provides a masking film having a light-shielding release layer formed on a transparent support, wherein the light-shielding release layer has a reddish-yellow colorant (hereinafter simply referred to as a light-shielding colorant that shields a wavelength of at least 470 nm or less). The above problem is solved by a light-shielding masking film containing a yellow colorant and a green colorant.

The light-shielding masking film of the present invention comprises a transparent support and a light-shielding release layer formed on the transparent support so as to be peelable.

The transparent support is not particularly limited as long as it is a transparent film or sheet. Examples of such a transparent support include olefin-based polymers such as polyethylene and polypropylene; polyvinyl chloride; polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer,
Vinylidene chloride polymers such as vinylidene chloride-acrylonitrile copolymer; styrene polymers such as polystyrene; polyesters such as polyethylene terephthalate and polybutylene terephthalate; nylon 6 and nylon 1
1. Films or sheets made of various synthetic resins such as nylon or polyamide such as nylon 66; polycarbonate; and polyimide can be used.

A film or sheet made of polyester, particularly polyethylene terephthalate, is generally used among the transparent supports.

These transparent supports may have an appropriate thickness, but usually have a thickness of about 5 to 100 μm.

The light-shielding release layer contains a yellow colorant and a green colorant that shield light of at least a wavelength of 470 nm or less. The yellow colorant may be a dye or a pigment,
Depending on the type, it is used in an amount that absorbs and blocks light in the wavelength region of 470 nm or less. Among such yellow colorants, pigments include, for example, CI Pigment Yellow 1-3, CI
Pigment Yellow 5, CI Pigment Yellow 12-15, CIP
igment Yellow 17, CI Pigment Yellow 24, CI Pigme
nt Yellow 83, CI Pigment Yellow 108, CI Pigment
Yellow 109, CI Pigment Yellow 110, CI Pigment Ye
llow 123, CI Pigment Yellow 151, etc., and as the dye, for example, CISolvent Yellow 14, CISol
vent Yellow 19, CISolvent Yellow 21, CISolvent
Yellow 79, CISolvent Yellow 81, CISolvent Yel
It can be selected from oil-soluble dyes such as low 82 and CISolvent Yellow 162. These yellow colorants may be used alone or in combination of two or more, and a pigment and a dye may be used in combination. A preferred colorant among yellow colorants is an oil-soluble dye,
The oil-soluble dye is preferably a gold-containing complex dye. The yellow colorant may be composed of a reddish yellow colorant, and a lemon yellow colorant and a reddish yellow colorant may be used in combination. The ratio of the lemon yellow colorant to the reddish yellow colorant is usually 30 to 80% by weight of the lemon yellow colorant, preferably 40 to 75% by weight, 70 to 20% by weight of the reddish yellow colorant, Preferably it is 60 to 35% by weight.

When the light-shielding wavelength of the yellowish colorant shifts to the shorter wavelength side of less than 470 nm, it is difficult to sufficiently shield the photosensitive wavelength of the photosensitive material.

The green colorant may be any of a dye and a pigment as long as it can be mixed with a yellow colorant to secure a green color. Among the green colorants, examples of the pigment include CI Pigment Green 2, CI Pigment Green 7, and C.I.
I. Pigment Green 8, CI Pigment Green 10, CI Pigme
nt Green 36, etc., and examples of the dye include, for example, C.
I. Solvent Green 3 and the like are exemplified.

These green colorants may be used alone or in combination of two or more, and a pigment and a dye may be used in combination. Among the green colorants, a preferred colorant is an oil-soluble dye, like the yellow colorant.

The use of a yellow or green oil-soluble dye can enhance the degree of coloring with a small amount and can form a light-shielding release layer having excellent transparency.

The ratio between the yellow colorant and the green colorant is 400 nm.
The following wavelengths can be shielded and can be appropriately set within a range in which a green color can be secured. Usually, the yellow colorant is 65 to 95% by weight, preferably 65 to 90% by weight, and the green colorant is 35 to 5% by weight. Preferably, it is about 35 to 10% by weight. If the ratio of the green colorant is less than 5% by weight, yellowish color becomes strong and it is difficult to reduce eye fatigue. If it exceeds 35% by weight, the ratio of the yellow colorant decreases, In some cases, the light-shielding property of a photosensitive material at a wavelength of 400 nm or less, which is the photosensitive wavelength, is reduced.

The light-shielding release layer contains a binder resin. As the binder resin, a thermoplastic resin, for example, polyvinyl acetate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, acrylic polymer, polystyrene, styrene-acrylate copolymer, Polyester such as polyethylene terephthalate or polybutylene terephthalate, polyacetal, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, polyvinylidene chloride, vinyl chloride-vinylidene chloride copolymer, Vinyl acetate-vinylidene chloride copolymer, acrylonitrile-vinylidene chloride copolymer, polyamide, polyurethane, polycarbonate, chlorinated polyolefin such as chlorinated polypropylene, acetyl cellulose, acetyl butyl cellulose Scan, ethylcellulose, cellulose polymers such as and, elastomers such as nitrocellulose, for example, natural rubber, chlorinated rubber, hydrochloric acid rubber, butadiene rubber,
Examples include isoprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butyl rubber, chloroprene rubber, ethylene-propylene rubber, ethylene-propylene-nonconjugated diene rubber, acrylic rubber, chlorosulfonated polyethylene rubber, silicone rubber, urethane rubber, and the like. . One or more of these binder resins are used. It is preferable to use at least an elastomer, particularly a nitrile rubber, and a thermoplastic resin among the binder resins.

The content of the binder resin may be any range as long as a release layer that can be peeled from the transparent support can be formed and the light-shielding property and the transparency are not impaired. Usually, the total amount of the colorant is 5 to 50% by weight,
Preferably, the amount is about 10 to 45% by weight.

Incidentally, the light-shielding release layer is an antioxidant, an ultraviolet absorber,
Heat stabilizer, plasticizer, antistatic agent, tackifier, plasticizer,
Various additives such as a filler may be contained.

The light-shielding masking film of the present invention usually shows the following light transmission characteristics. That is, light of a wavelength of 470 nm or less is shielded, the peak of light transmittance is in the range of 520 to 580 nm, and the light transmission amount in the range of 470 to 700 nm is Y ₂ ,
When the amount of light transmission in the range of 470~600nm and Y _1, the Y ₁ / Y ₂
Less than 60%. As described above, since the light-shielding masking film shields light having a wavelength of 470 nm or less, the light-sensitive material used for photolithography or the like is not exposed to light. Further, since the peak of the light transmittance exists in the wavelength range of 520 to 580 nm, it exhibits a green color and is easy on the eyes, and can reduce eyestrain even if engaged in cutting or peeling work for a long time. If the peak of the light transmittance is out of the above-mentioned wavelength range, the hue becomes strong yellow, red or bluish, and it is difficult to reduce eye fatigue. Further, when the value of Y ₁ / Y ₂ is 60% or more, the amount of light transmitted in a wavelength range of 600 to 700 nm, that is, the see-through property decreases, so that the see-through property as a whole also decreases. Further, the color becomes strong yellow, red or bluish, and it is difficult to reduce eye fatigue. Therefore, when producing or printing a composite photograph, a negative or positive image is difficult to see through a light-shielding masking film, and workability is reduced.

In this specification, the light transmission amount is a value obtained by integrating a light transmission function in a predetermined wavelength region, and the above Y ₁ / Y ₂ is defined by the following equation.

Y ₁ / Y ₂ = ▲ ∫600 ₄₇₀ ▼ f (λ) dλ / ⁷⁰⁰ ₄₇₀ ▼ f (λ) dλ (where Y ₁ is the light transmission amount in the wavelength range of _{470 to} ⁶⁰⁰ nm,
Y ₂ represents an amount of transmitted light in the wavelength range of 470~700nm, f
((Lambda) shows the light transmittance function with respect to wavelength.) The light-shielding release layer colored in a green color can also be prepared by mixing a yellow colorant and a blue colorant. In this case, Since a yellow colorant is mainly used and a very small amount of a blue colorant needs to be mixed, the hue and light transmission characteristics greatly change even if the addition amount of the blue colorant is slightly changed. On the other hand, in the present invention, since the yellowish colorant and the greenish colorant of the same system are mixed, the change in hue is extremely small even when the amount of each colorant is changed, and the colorant is stable. Hue and light transmission characteristics.

The light-shielding masking film of the present invention can be produced by a conventional method. That is, it can be produced by uniformly dispersing or dissolving the colorant and the binder resin in an organic solvent, applying the dispersion to a transparent support, and drying. Examples of the organic solvent include alcohols, aliphatic or alicyclic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, esters, ketones, ethers, and mixed solvents thereof. The application means is not particularly limited, and a conventionally used means such as a dip coater, a roll coater, a gravure coater, an air knife coater, and a spray can be used.

[Effects of the Invention] As described above, in the light-shielding masking film of the present invention, the light-shielding release layer contains a yellow colorant and a green colorant that shield at least a wavelength of 470 nm or less. It can be easily colored into a green system color, and can greatly reduce eye fatigue and have excellent light-shielding properties even when engaged in cutting and peeling for a long time.

EXAMPLES Hereinafter, the present invention will be described in more detail based on examples.

Example 1 100 parts by weight of a vinyl chloride-vinyl acetate copolymer (trade name: Denka 1000CK2, manufactured by Denki Kagaku Kogyo KK), nitrile rubber (trade name: Nipporan 1432J, manufactured by Zeon Corporation)
0 parts by weight, reddish yellow dye (manufactured by Orient Chemical Co., Ltd.
10.5 parts by weight of Varifast Yellow 4120), 23.3 parts by weight of yellow dye of lemon yellow color (manufactured by Orient Chemical Co., Ltd., oil yellow 101) and 23.3 parts by weight of green dye (manufactured by Orient Chemical Co., Ltd., oil green) 530) 5.8 parts by weight were uniformly dissolved in methyl ethyl ketone to prepare a coating solution. The coating solution was applied to a biaxially stretched polyethylene terephthalate film having a thickness of 100 μm using a roll coater and dried, and then a light-shielding release layer having a thickness of about 20 μm was formed.

Example 2 A light-shielding masking film was produced in the same manner as in Example 1, except that 8.7 parts by weight of the reddish yellow dye and 29 parts by weight of the lemon yellow yellow dye of Example 1 were used.

Example 3 A light-shielding masking film was produced in the same manner as in Example 1, except that 14 parts by weight of the reddish yellow dye and 11.7 parts by weight of the yellow dye of lemon yellow were used.

Example 4 A light-shielding masking film was obtained in the same manner as in Example 1, except that 22 parts by weight of the reddish yellow dye of Example 1 and 4.6 parts by weight of the green dye of Example 1 were used.

Example 5 A light-shielding masking film was produced in the same manner as in Example 1, except that 15 parts by weight of the reddish yellow dye and 7 parts by weight of the green dye were used.

Example 6 25 parts by weight of the reddish yellow dye of Example 1 and 7.5 parts of green dye
A light-shielding masking film was produced in the same manner as in Example 1 except that parts by weight were used.

The amount of the yellow dye added in the above examples is sufficient to absorb light of 470 nm or less and shield light, and the green dye is a dye having a light absorption peak at a wavelength of 490 nm.

Comparative Example 1 A light-shielding masking film colored yellow was produced in the same manner as in Example 1, except that 40 parts by weight of the yellow dye of lemon yellow used in Example 1 was used instead of the mixed colorant of Example 1. did.

Comparative Example 2 Example 1 was repeated except that 24 parts by weight of a red dye (manufactured by BASF, trade name Neozapon Red 355) and 20 parts by weight of Neozapon Orange 245 were used instead of the mixed colorant of Example 1. In the same manner as in the above, a light-shielding masking film colored in ruby was produced.

Comparative Example 3 In the same manner as in Example 1, except that 34.8 parts by weight of a yellow dye having a light-shielding wavelength of 465 nm or less (Varifast Yellow 2120, manufactured by Orient Chemical Co., Ltd.) was used instead of the mixed colorant of Example 1, To prepare a colored light-shielding masking film.

The light transmittance spectrum of the light-shielding masking film obtained in each of the examples and comparative examples was measured, and the light transmission characteristics, hue, eye fatigue, and the like were summarized in a table.

 The eye fatigue was evaluated according to the following criteria.

Excellent: Eye fatigue is remarkably small. Good: Eye fatigue is remarkable. Bad: Eye fatigue is remarkably large. A light transmittance spectrum chart of the light-shielding masking film of Example 1 is shown in the figure.

As is clear from the table, in the light-shielding masking film of the comparative example, except for the film of Comparative Example 3, although the wavelength of 470 nm or less can be shielded, eye fatigue during the cutting operation is remarkable, and the film of Comparative Example 3 Thus, it was difficult to shield the photosensitive wavelength of the photosensitive material from light. On the other hand, in the light-shielding masking films of Examples 1 to 6,
470 nm or less, and has a light transmittance peak at a wavelength of about 540 to 550 nm, and a ratio Y ₁ / of a light transmittance Y ₁ at a wavelength of 470 to 600 nm and a light transmittance Y ₂ at a wavelength of 470 to 700 nm. Y ₂ is about 48 to 55%
It was found that eye fatigue was significantly reduced.
In particular, the film of Example 1 had little eye fatigue.

[Brief description of the drawings]

FIG. 2 is a light transmission spectrum chart of the light-shielding masking film of Example 1.

Claims (2)

(57) [Claims] 1. A masking film having a light-shielding release layer formed on a transparent support, wherein the light-shielding release layer comprises a reddish-yellow colorant that shields at least a wavelength of 470 nm or less;
A light-shielding masking film comprising a green colorant. 2. The method according to claim 1, wherein a peak of light transmittance exists in a wavelength range of 520 to 580 nm, and a light transmittance in a wavelength range of 470 to 700 nm is represented by Y2,
When the light transmission amount in the wavelength range of 470 to 600 nm is Y1, Y1 / Y
2. The light-shielding masking film according to claim 1, wherein 2 is less than 60%.