JPH02222948A - Light shieldable masking film of thin green system - Google Patents

Abstract

PURPOSE:To improve working efficiency by incorporating a specific coloring agent mixture consisting of a pale yellow coloring agent and blue coloring agent into a light shieldable release layer. CONSTITUTION:The coloring agent mixture consisting of the pale yellow coloring agent and the blue coloring agent and having >=420nm max. light shielding wavelength is incorporated into the transparent light shieldable release layer which is formed on a transparent base and into which the coloring agents are incorporated. The masking film is so formed to have the following color tone characteristics: The max. spectral transmittance in a green color light range is >=50%; the density by a blue filter is 0.9 to 2.0; the density by a green filter is <=0.5; the density by a red filter is >=0.4; and the ratio of the density A by the green filter and the density B by the red filter is <=0.7. The fatigue of operator's eyes is drastically decreased in this way and the working efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a light-shielding masking film used primarily for cutting required portions in photolithography to form transparent images.

[Prior art and its problems]

Conventionally, transparent light-shielding #lII was placed on a plastic support.
Light-shielding masking films provided with MN are known. In the field of photoengraving, etc., in order to obtain a desired transparent image, the light-shielding release layer is cut by cutting lines manually or mechanically, and then the light-shielding release layer is formed according to the cut lines. Peel off.

By the way, the light-shielding release layer in such a masking film l) generally obtains the light-shielding effect by adding an R colorant, but in the past, most of the colorants used to obtain the light-shielding effect were It is a red colorant, and no green colorant is used. A masking film using a red coloring agent has the disadvantage that when a cut line is applied to the film and the film is peeled off, the eyes become very tired and the work efficiency is reduced if the work is done for a long time. Ta.

On the other hand, green colors are different from red colors,
It is known to reduce eye fatigue. Therefore, it is clear that if a green coloring agent is used, the above-mentioned drawbacks that occur when a red coloring agent is used are significantly improved. However, unlike the case of red colorants, green colorants are significantly inferior in light shielding effect, and even if commercially available green colorants are used, it is not possible to obtain a practical masking film.

The present inventors previously proposed a specific light-shielding masking film using a mixed colorant consisting of a yellow colorant and a blue colorant with a maximum light-shielding wavelength of 480 nm (Patent Application No. 6).
2-152298).

The color tone of this light-shielding masking film is a greenish color because a yellowish coloring agent with a strong orange tint was used, but the greenish color is a darkish color.

Because of the dark appearance, it is difficult for workers to see through the lines of the original drawing when placing a masking film on top of the original drawing and cutting lines on the masking film according to the original drawing.

[Problem of invention]

An object of the present invention is to solve the problems seen in the light-shielding masking film colored in the dark green color described above.

[Means to solve the problem]

As a result of extensive research in order to solve the above problems, the present inventors have discovered that the entire color can be improved by using a mixed colorant consisting of a pale yellow colorant and a blue colorant and having a maximum light blocking wavelength of about 420 nm or more. It was discovered that a material colored in a pale green tone has a practical light-shielding property and has excellent transparency of the original image, and the present invention was completed based on this finding.

That is, according to the present invention, in a product in which a transparent light-shielding release layer containing a colorant is provided on a transparent support, the light-shielding release layer contains a pale yellow colorant and a blue colorant. Provided is a light green light-shielding masking film characterized in that it contains a mixed colorant having a maximum light-shielding wavelength of about 420 nm or more, thereby coloring the entire color tone to a light greenish color.

In this specification, the maximum light-shielding wavelength means that the spectral transmittance is 0°2% or more in the range of light from 3000 m to that wavelength. In other words, it shows that the spectral transmittance exceeds 0.2% on the longer wavelength side.

The colorant contained in the light-shielding release layer in the masking film of the present invention is a mixed colorant consisting of a pale yellow colorant and a blue colorant, and its maximum light-shielding wavelength is about 420 nm.
This indicates the following. In the present invention, the maximum blocking wavelength of the mixed colorant is typically in the range of 420 to 470 wavelengths. The light yellow coloring agent used in the present invention has a light yellow tinge, and has a lemon-yellow color. Therefore, by mixing such a yellow colorant with a blue colorant, a pale green color tone can be obtained. The maximum light blocking wavelength of yellow colorant is initially 480 nm or more.
However, in actual tests, it was confirmed that a colorant having a maximum light-shielding wavelength in the range of 420 to 470 m has sufficient practicality. Also, as this pale yellow coloring agent.

Those whose maximum light-shielding wavelength is around 420 to 450 nm are usually used, but they are not necessarily limited to this. It should be within the range.

The specific characteristics of the pale yellow colorant used in the present invention are as follows:
The maximum light-shielding wavelength needs to be in the range of 420 nI or more as described above, but other than that.

The density by the blue filter is in the range of 0.9 to 2.0, and the density by the green filter is 0.
．． 5 or less, and furthermore, it can be shown that the density by the red filter is less than 0.4. In addition, the concentration measurement in this case is carried out using a Macbeth concentration meter (
Macbeth TD904) and blue filter as the filter.

1 each of tyratten47 and ec-40M
Using 2 pieces in total, for the red filter, vr
One sheet of Ajten 92 was used, and a green filter was attached using one sheet of Wratten 93.

Examples of light yellow colorants that can be used in the present invention include Orasol Yellow 2GL,
SavinylYellow RLS, 5avinyl
Yellow 2GLS, Vali FastYel
low 4120. Vali Fast Yellow
i 1103. Vali FastYellow 21
10. Vali Fast Yellow+ 1101
．． Vali FastYellow 1105. Aiz
en SOT Yellow-1, Mihara 0i
lYellov 3G, Mihara Oil
Yellow 5G, Mihara Oil Y
e11ot+ LOG, Kayaset Yellow
ow ni-RL, Oil Yellow + 10
1゜Oil Yellow 107. Oil Yellow
ow D, Neo 5upper YclowC-13
1, Neo 5upper Yellow C-132N
Examples include eozapon Yellow018.

These substances may be used alone or in combination as long as they have the above characteristics.
Can be used in combination of more than one species. The light-shielding wavelength of the blue colorant is not particularly limited, and it may be any colorant that gives a WI green color tone when mixed with the light yellow colorant. Examples of such a colorant include, for example.

0rasol Blue 2GLN, 0rasol B
lue GN, Neo 5upper [1ule C-5
31, Neo 5upper Blue C-551, V
ali FastBlue 1505. Vali Fa
st Blue 2606,5 avinyl Blue
GLS, Neozapon Blue 807. Oil
Blue BO etc. are mentioned. These things are 2
More than one species can be used.

The mixed colorant used in the present invention has a pale greenish color, and its specific characteristics include that the maximum light-shielding wavelength must be in the range of 420 nm or more, as described above. , the degree of haziness with the blue filter is 0.9
~2.0, and the density by green filter is 0.5 or less (preferably O,OS~0.
45), and further, the density by the red filter is 0.4 or more (preferably 0.4 to 2.7), and the ratio A/B of the density A by the green filter to the density B by the red filter. is 0.7 or less (preferably 0.4 to 2.7). In order for the obtained light-shielding masking film to exhibit a good light green color, it is important that all of the above concentration ranges are satisfied. For example, the density due to a blue filter is 2.
If it is 0 or more, the color will be dark green instead of a thin border.

Furthermore, if the ratio of the density obtained by the green filter to the density obtained by the red filter is 0.7 or more, the resulting image will not be pale green but pale yellow with a greenish tint. Note that the concentration measurement conditions in this case are the same as those shown for the pale yellow colorant.

The transparent support may be made of materials commonly used for light-shielding masking films.For example, in addition to films made of polyester such as polyethylene terephthalate, polybutylene terephthalate, and polyoxybenzoate, synthetic resin films such as polycarbonate films may be used. It will be done. These films may be unstretched or stretched, and have a thickness of 25 to 250 mm.

To obtain the light-shielding masking film of the present invention.

A light-shielding release layer containing the above-mentioned mixed colorant may be laminated on the transparent support. It is advantageous to use an ultraviolet absorber, and by using this, a masking film with excellent light-shielding properties can be obtained. Conventionally known UV absorbers are used, such as salicylic acid ester, benzotriazole, and benzophenone compounds, but in the present invention, benzophenone absorbers do not bleed from the light-shielding release layer. , its use is particularly preferred. The usage ratio of the ultraviolet absorber is 1 part by weight of the mixed colorant,
O, OS ~ 1.0 parts by weight 1. Preferably 0.2-0.7
It is a proportion of parts by weight.

In addition to the above-mentioned mixed colorant and ultraviolet absorber, the light-shielding release layer contains a polymeric substance such as synthetic rubber or synthetic resin as a binder component, but the specific structure of the light-shielding release layer is not well known. It can be constructed according to conventionally known techniques. For example, such a light-shielding release layer may contain, in addition to the above-mentioned components, nitrile rubber, vinyl chloride-vinylidene chloride copolymer, and optional additives such as a roughening agent. can be done,
In addition, the amount of the colorant added in the light-shielding release layer is usually 2 to 5.
The amount is 0% by weight, preferably 5-30% by weight2, so that the transparency of the light-shielding coating liquid is not impaired.

In the present invention, when a light-shielding release layer is laminated on a transparent support, the light-shielding release layer can be laminated via a pressure-sensitive adhesive layer. In such a light-shielding masking film, once peeled off, the film can be reattached to the surface of the pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer can be formed using, for example, a synthetic resin-based or rubber-based adhesive. Examples of synthetic resin adhesives include acrylic ester copolymers, saturated polyester compounds, polyurethane, etc., and examples of rubber adhesives include natural rubber,
Examples include chloroprene rubber and nitrile rubber.

Preferred light-blocking release layers for use in conjunction with the pressure sensitive adhesive layer are those containing nitrile rubber, nitrocellulose and a plasticizer in addition to the mixed colorant and optional UV absorber described above. In this case, the nitrile rubber is, for example, a copolymer of acrylonitrile-butadiene or a terpolymer of acrylonitrile-butadiene-carboxyl group-containing monomer, with an acrylonitrile content of 19 to 51% by weight. Preferably used.

Nitrocellulose has a nitrogen content of 10.7 to 12
．． 2% by weight is preferably used. As a plasticizer, a fatty acid ester (preferably a molecular weight of 300 to 500
), trimellitic acid esters (preferably those with a molecular weight of 500 to 700), epoxidized fats and oils (glycerides) (preferably those with a molecular weight of 300 to 1300), epoxidized fatty acid esters (non-glycerides) (preferably those with a molecular weight of 300 to 1,300) 1300), etc. The weight ratio of nitrile rubber and nitrocellulose is (20:80) ~
(80:20), preferably (30 near 0) to (70:
30). The proportion of plasticizer used is 0.1 to 3 parts by weight per 100 parts by weight of the total amount of nitrile rubber and nitrocellulose.
0 parts by weight, preferably 0.5 to 20 parts by weight. The mixed colorant is a total of 1 of nitrile rubber and nitrocellulose.
3 to 30 parts by weight, preferably 5 to 2 parts by weight per 100 parts by weight
It is 0 parts by weight. Furthermore, in the case of a masking film having this pressure-sensitive adhesive layer, the light-shielding release layer includes:
It is best to include incompatible organic compounds such as benzibamine resin and inorganic compounds such as silica.The addition of these compounds not only provides an anti-reflection effect but also reduces stickiness on the surface. can get. Further, the pressure-sensitive adhesive layer can contain a part of the mixed colorant to be included in the light-shielding release layer.

The light-shielding masking film of the present invention generally has a wavelength of 5
It has a light transmittance peak between 30 nm and 57On+i, and the light transmittance at the wavelength showing the peak exceeds 50%,
It has excellent transparency.

〔Effect of the invention〕

The light-shielding masking film of the present invention exhibits a pale green color tone with good transparency. Therefore.

In the work of making a cut line on the masking film of the present invention and peeling off the light-shielding release layer according to the cut line, unlike the case of using a conventional masking film showing a reddish color, the operator's eye Fatigue is significantly reduced and improved working capacity is achieved.

Furthermore, in the masking film of the present invention, since the light-shielding release layer has a pale greenish color with good transparency, the original image placed underneath can be clearly seen through.

(Example) Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A homogeneous mixture having the component composition shown in Table 1 was used as a light-shielding coating liquid.

The colorant A shown in Table 1 is Oil Yellow.
tglol (manufactured by Orient Chemical Industry Co., Ltd.), Colorant B is! /ali Fast Blue 4120 (manufactured by Orient Chemical Industry Co., Ltd.) 1 Colorant C is Ncoz
apon Blue 807.

The UV absorber is 2.2', 4,4'-tetrahydroxy-benzophenone.

The acrylonitrile-butadiene rubber had an acrylonitrile content of 33% by weight (two-ball 1042,
(manufactured by Nippon Zeon Co., Ltd.).

The vinyl chloride-vinyl acetate copolymer consists of 86% vinyl chloride and 14% vinyl acetate (VYHll, manufactured by Union Carbide).

A roughening agent roughens the surface and eliminates stickiness.
Mulch with silica (Thyroid 74, Fuji Davison Co., Ltd.).

Table 1 Next, the coating solution was applied to the surface of a polyethylene terephthalate film (thickness: 100 μl) as a support and dried to form a light-shielding peeling layer with a thickness of 25 pm.

The masking film created in this way has a light green tone and shows the light transmission spectrum chart shown in Figure 1, blocks light of wavelengths below 450 nm, and transmits light between wavelengths of 530 nm and 570 nm (545r+a+). It has a transmittance peak, and the light transmittance at that peak is 50%.
It has excellent transparency.

Example 2 A masking film was obtained in the same manner as in Example 1, except that the coating solution was applied and dried on the pressure-sensitive adhesive layer surface of a polyethylene terephthalate film having a chloroprene-based pressure-sensitive adhesive layer (thickness: 3 μI). .

This masking film also showed a light transmission spectrum chart similar to that shown in the drawings. This masking film allows a film once peeled to be reattached to the transparent support.

Example 3 A mixed solution having the component composition shown in the following table was obtained as a master coating solution.

Table-2 did.

Furthermore, the measurement of one-tone characteristics was carried out using a Magbeth densitometer as described above. The color tone was determined visually.

Regarding the light-shielding property, those whose maximum light-shielding wavelength was in the range of 420 nm or more were judged as "○", and those in the lower range were judged as "x".

Next, a coating solution was prepared by dissolving yellow and blue dyes in the amounts shown in Table 3 in 20 parts by weight of the master coating solution,
This coating liquid was applied to the surface of a polyethylene terephthalate film (thickness: 8100 μm) and dried to form a light-shielding release layer with a thickness of 24 μm.

Next, the light-shielding masking film thus obtained was examined for its color tone characteristics and light-shielding properties.

The results are shown in Table-).

In addition, as the blue dye mentioned above, Neozapon B
lue 807 was used, and as the yellow dye, oil y
ellowlol; Dye A and 5avinyl yel
loty RLS (dye B) was used.Table 3 The test was carried out in the same manner using a Magbeth densitometer. Further, the chromaticity coordinates were measured in accordance with JIS Z 8722-19824m, and 0 color tone was visually observed.

Next, Table 4 also shows the color characteristics, color tone, and light shielding properties of various yellow dyes.

In Table 4, the color tone characteristics are measured as described above.

[Brief explanation of the drawing]

The drawing is a light transmission spectrum chart of the masking film of the present invention.

Claims (5)

[Claims] (1) In a device in which a transparent light-shielding release layer containing a colorant is provided on a transparent support, the light-shielding release layer has a maximum light-shielding wavelength composed of a pale yellow colorant and a blue colorant. 4
A light green light-shielding masking film characterized by containing a mixed colorant having a particle diameter of 20 nm or more to give a light green tone to the overall color tone. (2) Density by Brule filter is 0.9 to 2.0
, a color tone in which the density with the green filter is 0.5 or less, the density with the red filter is 0.4 or more, and the ratio of density A with the green filter to density B with the red filter is 0.7 or less. The masking film according to claim 1, having the following characteristics. (3) The masking film according to claim 1 or 2, which contains an ultraviolet absorber together with a mixed colorant. (4) The masking film according to claim 3, wherein the ultraviolet absorber is a benzophenone compound. (5) The masking film according to any one of claims 1 to 4, wherein the light-shielding peeling layer is provided on a transparent support via a pressure-sensitive adhesive layer.