JPH1016396A - Formation of colored pattern on substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a colored pattern in which working precision and evenness are excellent and trouble of contamination at the time of polishing is prevented by utilizing laser working and peeling of a colored paint film. SOLUTION: A first colored paint film 2 is formed on a substrate 1 and a release layer 3 is formed on the first colored paint film 2. Laser beam irradiate the first colored paint film 2 and the release layer 3 in a pattern shape by a laser abrasion method to remove the colored paint film and the release layer in the part irradiated with a laser beam. In accordance with necessity, a second colored paint film 5 is formed on the obtained substrate and the release layer 3 is formed on the second colored paint film 4. Furthermore, a part of the colored paint film and the release layer is removed by the laser abrasion method so that a part of the surface of the substrate on which the colored paint film is formed is exposed in the pattern shape. A third colored paint film 5 and a fourth colored paint film 6 are formed by repeating the processes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a colored pattern using a laser ablation method and peeling of an unnecessary coating film from a peeling layer, and a color filter obtained by this forming method.

[0002]

2. Description of the Related Art In recent years,
As the screen size of the liquid crystal panel increases, the size of the color filter increases. However, the "pigment dispersion method", which is the mainstream of the method for producing a color filter, uses a colored resin composition of a plurality of colors in which a pigment or a dye is dispersed in a photosensitive resin, and repeatedly performs coating, exposure, and development. This is a method using photolithography, and it has practically reached a limit to perform mask exposure on a large substrate with high accuracy. Further, the development process after exposure contributes to a decrease in yield.

Therefore, as a method for manufacturing a large-area color filter, the present inventors have proposed a method combining laser processing and a flattening polishing step (Japanese Patent Application No. 7-33).
No. 7408, Japanese Patent Application No. 8-69616). This method enabled the production of large-area color filters,
There are problems of processing accuracy, flatness, and contamination during polishing in the polishing process.

[0004] The inventors of the present invention have conducted intensive studies on a method for manufacturing a large-area color filter free from the above-mentioned problems by using laser processing and not using a flattening and polishing step. The present inventors have found that the above object can be achieved by a method of forming a colored pattern using laser processing and peeling of a colored coating film, and have completed the present invention.

[0005]

That is, the present invention provides:
(1) forming a first colored coating on the substrate and forming a release layer on the first colored coating; (2) laser ablation on the first colored coating and the release layer A step of irradiating a laser beam in a pattern by a method to remove the colored coating film and the peeling layer of the laser beam irradiating portion, and (3) if necessary, forming a layer on the substrate obtained in the above step (2). A colored coating film different from the colored coating film and a release layer on the colored coating film, and irradiate a laser beam in a pattern by a laser abrasion method to remove the colored coating film and the release layer in the laser light irradiated portion. Then, forming the colored coating film and the release layer of the predetermined pattern having the different colors is repeated one or more times (when the color coating films of the different colors are repeated two or more times, the respective colors of the different colors are different from each other). (4) the above step (2) or ( A) forming a colored coating having a color different from any of the formed colored coatings on the substrate obtained in the step (5), and (5) removing the unnecessary colored coating and the release layer on the release layer by removing the release layer. An object of the present invention is to provide a method for forming a colored pattern having a step of removing and removing by dissolving.

[0006] The present invention also provides: The color of the colored coating film is
The present invention provides a method for forming a colored pattern according to the above item 1, which forms a colored pattern of four colors of red, blue, green and black (black matrix).

[0007] The present invention further provides: It is intended to provide a color filter characterized in that four colored patterns are formed on a transparent substrate for a liquid crystal display device by the formation method described in the above item 2.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The substrate used in the present invention is a glass, resin substrate, metal plate, or a thin film of metal, indium oxide, tin oxide or the like formed on a glass or resin substrate by a sol-gel method or sputtering. And a substrate obtained by a vapor deposition method, a CVD method, or the like.

In the step (1) of the method of the present invention, a first colored coating film is formed on the substrate. The paint used for forming the first colored coating film can be used without any particular limitation as long as it is a coating material capable of forming a colored coating film of a desired color. As the resin type, for example, acrylic resin, epoxy resin,
Examples thereof include a polyamide resin, a polyurethane resin, a polyester resin, an alkyd resin, a silicon resin, and an amino resin. These resins may be used alone or as a mixture of two or more resins. The paint form is
A water-based or organic solvent-based coating may be used, and the curing form of the coating may be any of a thermosetting type, a lacquer curing type, and an actinic ray curing type such as ultraviolet rays.

As the color pigment to be dispersed in the resin for coloring, a pigment excellent in heat resistance, chemical resistance, solvent resistance, and light resistance is preferable, and furthermore, an appropriate spectrum and transparency are required. It is preferably an organic pigment.
The coloring pigments can be used alone or as a mixture of two or more. From the viewpoint of transparency and absorption coefficient of visible light, the particle diameter of the colored pigment in the colored resin coating material is preferably such that 95% by weight or more of the pigment is 300 nm or less, preferably 120 nm or less. Transparency by dispersing the pigment by a known method with a roll etc.,
It is effective to improve the absorption coefficient.

Examples of suitable pigments having excellent various resistances are shown by color index (CI) numbers.

Yellow pigment: C.I. I. 24, 83, 93, 9
4, 108, 109, 110, 117, 125, 13
7, 147, 153, 154, 166, 168 Orange pigment: C.I. I. 36, 43, 51, 55, 5
9, 61 Red pigment: C.I. I. 97, 122, 123, 149, 1
68, 177, 178, 180, 187, 190, 19
2,209,215,216,217,220,22
3, 224, 226, 227, 228, 240 Violet pigment: C.I. I. 19, 23, 29, 30,
37, 40, 50 Blue pigment: C.I. I. 15, 15: 1, 15: 3, 15:
4, 15: 6, 22, 60, 64 Green pigment: C.I. I. 7, 36 Brown pigment: C.I. I. 23, 25, 26.

The above-mentioned coloring paint is applied on a substrate by spin coater coating, screen printing, spray coating, electrodeposition coating, curtain coating, and the like, and dried and cured as necessary to form a first colored coating film. be able to. For coating on a large-sized substrate, it is particularly preferable to apply the coating by spin coater coating. The thickness of the colored coating film is not particularly limited, but is usually 0.5
It is preferably about 5 μm.

The release layer formed on the first colored coating film does not dissolve or peel during the formation of the colored coating film, but is easily dissolved and dissolved in a release agent in the peeling and washing steps to remove and remove. Anything that can be done is acceptable. Examples of the release layer include water-soluble resins such as polyvinyl alcohol, polyvinyl acetate, and polyacrylic acid. The release layer can be obtained by applying a liquid release layer forming agent on the first colored coating film and drying it, or applying the resin film on the first colored coating film. It can also be obtained by attaching.

In the step (2) of the present invention, the first colored coating film and the release layer formed in the step (1) are irradiated with a laser beam in a pattern by a laser abrasion method. The colored coating film and the release layer are removed.

In the present invention, the laser abrasion method means “by irradiating an object with laser light,
A method of decomposing or evaporating the laser beam irradiation part of the object to a desired depth. "

In the present invention, the laser light used for the laser abrasion method can be used without particular limitation as long as it can decompose or evaporate the colored coating film.
Examples include a YAG laser, a carbon dioxide laser, and a semiconductor laser.

As a method of irradiating a colored coating film with a laser beam in a pattern, the laser beam is narrowed down using an optical component such as a lens, and the narrowed laser beam is applied to a colored resin film or a release layer based on CAD data or the like. Examples include a direct drawing method of irradiating in a pattern, a method of forming a pattern by passing a laser beam through a stencil, and irradiating a colored resin film or a release layer.

Irradiation of the colored coating film with laser light varies depending on the thickness of the colored coating film, but usually, the energy density of one pulse is from 100 mj / cm ^{2 to} 5000 mj / cm.
^The irradiation can be suitably performed by irradiating about 1 to 100 pulses with the ^two pulse lasers.

In the present invention, the step (3) is a step performed as necessary when increasing the number of colors of the patterned colored coating film formed on the substrate, and is obtained in the above step (2). On the substrate that has been formed, a colored coating having a different color from the formed colored coating and a release layer formed on the colored coating, and by a laser abrasion method, the colored coating and the release layer of the laser light irradiated portion are removed. And forming a colored coating film and a release layer of the different colors in a predetermined pattern shape. When increasing the number of colors, the step (3) may be repeatedly performed. In the step (3), the release layer is preferably formed from a liquid release layer forming agent, since the release layer is formed on the uneven shape on which the patterned colored coating film is formed.

The step (4) of the present invention is obtained on the substrate obtained in the step (2) when the step (3) is not performed, and is obtained in the step (3) when the step (3) is performed. On the substrate
This is a step of forming a colored coating having a different color from any of the colored coatings formed in the above steps (1), (2) and (3).

In the above steps (2), (3) and (4), the color paint used for forming the colored coating film in the above step (1) may be the color coating material used for forming the first colored coating film. The same colored paint can be used except that the paint and the paint color (pigment composition) are different. The coating of the coloring paint can be performed by the same coating method as in the step (1).

In the step (5) of the present invention, the unnecessary colored coating film and the release layer on the release layer are removed from the substrate having the plurality of patterned colored coating films and the release layer obtained in the above step (4). This is a step of separating and removing the release layer by dissolving the release layer, whereby the colored coating and the release layer other than the patterned colored coating formed in contact with the substrate are removed, and the target pattern is removed. A plurality of colored coatings of a shape are formed on the substrate. The release liquid for dissolving the release layer may be any liquid that can dissolve the release layer without dissolving the formed colored coating film, and may be appropriately selected depending on the type of the release layer. For example, when the release layer is water-soluble, water or a solution containing water as a main component can be used as the release liquid.

In the method of the present invention, after the step (4), the colored coating film on the substrate having the colored coating film obtained in the step (4) is irradiated with laser light in a pattern by a laser abrasion method. The step of removing the colored coating film of the laser beam irradiation part may be performed, and then the step (5) may be performed. By this method, a part of the substrate surface was exposed,
A substrate having a plurality of colored coating films in a pattern can be formed. In addition, on a part of the obtained substrate, in which a part of the substrate surface is exposed, which has a plurality of colored coating films in a pattern, where there is no colored coating film, a colored coating film having a color different from all colors of the colored coating film is applied. It may be formed. This colored coating film is formed by using the same colored coating material in the step (1) except that the coating color (pigment composition) is different from that used in the formation of the first colored coating film in the step (1). It can be carried out by the same coating method as in 1).

A method of forming a color filter by forming four colored patterns on a transparent substrate for a liquid crystal display using the method of the present invention will be described with reference to the drawings.

FIG. 1 is a model diagram of a cross section of a substrate showing a process of forming a color coating film on a substrate to form a color filter, and FIG. 2 is a diagram of the color filter obtained by the process shown in FIG. It is a plane model figure.

In FIG. 1, (a) shows a step (1) in which a first colored paint (for example, a black paint) is applied onto the transparent substrate 1 by, for example, a spin coating method and dried to form a first colored paint. After the colored coating film 2 is formed, a release layer forming agent which is an aqueous polyvinyl alcohol solution is applied and baked to form the release layer 3.
FIG. 4 is a model diagram of a model in which is formed.

FIG. 2 (b) shows the result of step (2).
FIG. 3 is a model diagram of a part of a colored coating film and a part of a release layer removed by a laser abrasion method so that a part of a surface of a substrate on which a colored coating film is formed is exposed in a pattern.

FIG. 3C shows the result of the step (3).
FIG. 2 is a model diagram of a substrate having a patterned colored coating film of (2), a second colored coating film 4 (for example, a blue coated film), and a release layer 3 formed on the second colored coating film. .

FIG. 4D shows the result of the step (3).
FIG. 3 is a model diagram of a part of a colored coating film and a part of a release layer removed by a laser abrasion method so that a part of a surface of a substrate on which a colored coating film is formed is exposed in a pattern.

FIG. 5E shows that the third colored film 5 (for example, a red film) and the third colored film 5 are formed on the substrate having the patterned colored film shown in FIG. The third
A release layer 3 is formed on the colored coating film, and then a part of the colored coating film and the release layer is removed by a laser abrasion method so that a part of the surface of the substrate on which the colored coating film is formed is exposed in a pattern. It is a model figure of what was removed.

FIG. 4F shows the result of the step (4).
FIG. 7 is a model diagram of a substrate having a patterned colored coating film formed with a fourth colored coating film 6 (for example, a green coating film).

FIG. 7G shows the result of step (5).
By immersing the substrate on which the colored coating film is formed in a stripping solution or spraying the stripping solution, the unnecessary colored coating film and the release layer on the release layer are peeled and removed by dissolving the release layer. FIG. 3 is a model diagram of a substrate having a target patterned colored coating film.

FIG. 2 is a plan model view of the substrate having the patterned colored coating film shown in FIG.

FIG. 3 is a model diagram of a cross section of the substrate, showing a step of forming a color filter by forming a colored coating film on the substrate by a method different from that of FIG.

In FIG. 1, the colored coating applied to the portion from which the colored coating has been removed by the laser abrasion method is finally left to form a colored coating pattern. In the above method, when the colored coating film is removed by a laser ablation method, the patterned colored coating film which remains without being removed finally remains to form a colored coating film pattern.

In FIG. 3, (h) shows a step (1) in which a first colored paint (for example, red paint) is applied on the transparent substrate 1 by, for example, a spin coat method and dried to form a first colored paint. After the colored coating film 2 is formed, a release layer forming agent which is an aqueous polyvinyl alcohol solution is applied and baked to form the release layer 3.
FIG. 4 is a model diagram of a model in which is formed.

FIG. 4H shows a diagram (H) by the step (2).
FIG. 4 is a model diagram of a part of the colored coating film and the release layer removed by a laser abrasion method so that a part of the colored coating film and the release layer remain in a pattern.

FIG. 4 (n) shows the result of the step (3).
FIG. 2 is a model diagram of a substrate having a patterned colored coating film of (2), a second colored coating film 4 (for example, a blue coated film), and a release layer 3 formed on the second colored coating film. .

FIG. (L) shows the result of the step (3).
FIG. 4 is a model diagram of a part of the colored coating film and the release layer removed by a laser abrasion method so that a part of the colored coating film and the release layer remain in a pattern.

FIG. (ヲ) shows the result of step (4).
FIG. 6 is a model diagram of a third colored coating film 5 (for example, a green colored film) formed on a substrate having a patterned colored coating film of FIG.

FIG. 5 (a) shows a step (5) after the step (4).
(A) is a model diagram of a part of the colored coating removed by a laser abrasion method so that a part of the colored coating of FIG.

FIG. 5F shows the result of the step (5).
By immersing the substrate on which the colored coating film is formed in a stripping solution or spraying the stripping solution, the unnecessary colored coating film and the release layer on the release layer are peeled and removed by dissolving the release layer. FIG. 3 is a model diagram of a substrate having a patterned colored coating film.

FIG. 4G is a model diagram of a substrate in which a fourth colored paint (for example, black paint) is applied to the surface of the substrate having the colored coating shown in FIG. Use a black paint that is cured by irradiation with actinic rays such as ultraviolet rays, and cure the black paint at locations other than the portions where the first to third colored coatings are formed by irradiating actinic rays from the back of the substrate Can be done. When irradiating with ultraviolet rays, a black paint film on the first to third colored coatings is prevented from being cured by including an ultraviolet absorber in the first to third colored coatings. Can be. Uncured and unnecessary black paint film can be removed by development. Thus, a substrate having four colored coating films shown in FIG.

When the black paint film is cured by irradiation with actinic rays such as ultraviolet rays, a cover coat layer for blocking oxygen is provided on the black paint film so as to prevent the curing from being inhibited by oxygen. Is preferred.

When the fourth colored paint film (black paint film) is cured by heating or the like, the unnecessary black paint film unavoidably formed on the first to third colored paint films is also cured. Need to remove the unwanted cured black coating,
This removal can be performed by polishing or the like, whereby a substrate having a colored coating film shown in FIG.

The plan model diagram of the substrate having the four colored coating films in the pattern shown in FIG. 4G has a lattice shape similar to that shown in FIG.

When a color filter is used, usually, red,
Four colors of blue, green, and black (black matrix) are used, and various colors can be used depending on the application.
The order in which the blue and green colored patterns are formed is not particularly limited and can be appropriately performed.

In the step shown in FIG. 3, a black matrix is previously formed on a transparent substrate by using a chromium plating method, a chromium vapor deposition method, a photolithographic method using an ultraviolet-sensitive black resist, or the like. By using the transparent substrate on which the black matrix is formed as a substrate and sequentially performing the same steps as shown in FIGS. A transparent substrate on which a black matrix is formed can be obtained. In this case, each of the red, blue, and green coloring paints used for forming the red, blue, and green coloring films does not need to contain an ultraviolet absorber.

[0050]

The present invention will be described more specifically with reference to the following examples. Hereinafter, both “parts” and “%” are based on weight.

Preparation of Acrylic Resin Solution Synthesis Example 1 288 parts of acrylic acid 300 parts of styrene 255 parts of n-butyl acrylate 157 parts of 2-hydroxyethyl acrylate 100 parts of t-butyl peroxybenzoate 100 parts A mixture of the above monomer and polymerization initiator was placed in a flask. 2-butoxyethanol 1000 heated to 110 ° C in
The resulting mixture was dropped into the mixture for 2 hours with stirring, and then kept at the same temperature for 2 hours to obtain an acrylic resin solution having a solid content of 50%.

Example 1 The acrylic resin solution having a solid content of 50% obtained in Synthesis Example 1 and other components were uniformly dispersed in the composition shown in Table 1 below.
Red, green, blue and black colored resin coating materials were obtained. The coloring pigment was mixed with a part of an acrylic resin solution, a pigment dispersant, and a part of an organic solvent, dispersed by a sand mill, and blended as a pigment paste. The average particle size of the pigment in each colored resin coating material is: red pigment: 60 nm, green pigment: 90 nm, blue pigment:
80 nm, black pigment: 50 nm, all pigments 9
5% by weight or more had a particle size of 120 nm or less.

In Table 1 below, (note) has the following meaning.

(* 1) Cymel 350: manufactured by Mitsui Cytec Co., Ltd., methylated melamine resin, solid content: about 100%.

(* 2) BYK160: a pigment dispersant which is a polymer copolymer solution manufactured by BYK Chemie.

The black colored resin coating material obtained as described above was coated on a glass plate (size 200 × 200 ×
1.1 mm) by spin coating so as to have a dry film thickness of about 2 μm, and after drying at 160 ° C. for 10 minutes, a release layer forming agent, which is a 5% aqueous solution of polyvinyl alcohol, is applied thereon. A glass substrate having a black coating film and a release layer is applied by spin coating to a thickness of about 1 μm and dried at 160 ° C. for 10 minutes [see FIG.
I got Next, the black coating film and the release layer of this substrate are passed through a stencil using a krypton-fluorine gas excimer laser, and a laser having a predetermined pattern is irradiated under the condition that one pulse having an energy density of 1200 mj / cm ² has six pulses. Irradiation, decomposes and removes the black coating film at the irradiated location, and a pattern-shaped black coating film having a release layer with a line / space of 260 μm / 100 μm [FIG.
Reference "was obtained.

Next, the above-mentioned blue colored resin coating material is applied on a glass plate on which the above-mentioned patterned black coating film is formed by a spin coating method so as to have a dry film thickness of about 2 μm.
After drying at 60 ° C. for 10 minutes, a release layer forming agent, which is a 5% aqueous solution of polyvinyl alcohol, is applied thereon by spin coating so that the dry film thickness becomes about 1 μm.
After drying at 0 ° C. for 10 minutes, a glass substrate having a colored coating film and a release layer (see FIG. 3C) was obtained. Next, the colored coating film and the release layer of the substrate are passed through a stencil using a krypton-fluorine gas excimer laser, and a laser having a predetermined pattern is applied with an energy density of 1200 m per pulse.
Irradiation was performed under the condition that the pulse of j / cm ² was 8 pulses, and the colored coating film at the irradiated location was decomposed and removed, and the line / space was 260 μm / 100 μm, and the surface was a blue coating film having a release layer. Patterned colored coating "See Fig. (D)"
I got

Further, on the glass plate on which the patterned colored coating film is formed, film formation and laser irradiation are performed in the same manner as described above using the above red colored resin coating material, and the line / space is set to 260 μm / 100 μm. There was obtained a patterned colored coating film “see FIG. (E)” in which the surface was a red coating film having a release layer.

Then, the above-mentioned green colored resin coating material is spin-coated on a glass plate on which a patterned colored coating film, which is a red coating film having a release layer, is formed so as to have a dry film thickness of about 2 μm. Apply by the coating method,
After drying for 5 minutes, a glass plate having a green colored patterned coating film on the surface was obtained (see FIG. 6F).

A substrate with a green surface, on which a four-color patterned colored resin film obtained as described above was formed, was
After dissolving the release layer by immersion in a release solution of water at 0 ° C. for 10 minutes, the surface was rubbed to remove an unnecessary colored coating film and release layer.

As a result, a color filter (see FIG. 7G) in which the surface of the glass plate was completely covered with a colored pattern of black (black matrix), green, blue and red with a thickness of about 2 μm was obtained. The line width of the black (black matrix) colored pattern was 20 μm, and the line width of each of the blue, red, and green colored patterns was 100 μm. The obtained multicolored pattern was smooth, fine and excellent in long-term performance.

[0062]

[Table 1]

Production Example 4 of Ultraviolet-Curable Black Paint Production Example 4 A mixture of 40 parts by weight of methyl methacrylate, 40 parts by weight of butyl acrylate, 20 parts by weight of acrylic acid and 2 parts by weight of azobisisobutyronitrile was placed in a nitrogen gas atmosphere. It was dropped into 90 parts by weight of propylene glycol monomethyl ether (hydrophilic solvent) maintained at 110 ° C. over 3 hours. After the dropwise addition, the mixture was aged for 1 hour, and a mixed solution comprising 1 part by weight of azobisdimethylvaleronitrile and 10 parts by weight of propylene glycol monomethyl ether was added to 1 part.
It was added dropwise over a period of time and aged for 5 hours to obtain a solution with a high acid value acrylic resin (resin acid value: about 155 mgKOH / g). Next, glycidyl methacrylate 24 was added to this solution.
Parts by weight, 0.12 parts by weight of hydroquinone and 0.6 parts by weight of tetraethylammonium bromide, and reacted at 110 ° C. for 5 hours while blowing in air to obtain a photopolymerizable acrylic resin having a solid content of about 54% (resin acid value). About 50m
gKOH / g, polymerizable unsaturated group concentration 1.35 mol / k
g, Tg point 20 ° C., number average molecular weight 20,000).

In 130 parts of the obtained acrylic resin solution having a solid content of about 54%, 10 parts of isobutyl acetate, 108 parts of 3-methoxybutyl acetate, and BYK160 (a pigment dispersant which is a polymer copolymer, manufactured by BYK Chemie) 12 parts and 60 parts of carbon black were blended to perform pigment dispersion to obtain a black pigment paste. To 320 parts of this black pigment paste, 30 parts of trimethylolpropane triacrylate, 2,4-
4 parts of diethylthioxanthone, 2-methyl-2-morpholino (4-thiomethylphenyl) propan-1-one 5
And 780 parts of 3-methoxybutyl acetate, to give a photosensitive black paint.

Example 2 To 812 parts of each of the red, blue and green colored resin coating materials used in Example 1, 38 parts of TINUVIN 384 (manufactured by Ciba, ultraviolet absorption) were mixed to contain an ultraviolet absorber. Each colored paint was obtained. A colored pattern was formed using each of the colored paints and the ultraviolet-curable black paint obtained in Production Example 4.

The above red paint was applied to a glass plate (size 200 ×
(200 × 1.1 mm) by spin coating so as to have a dry film thickness of about 2 μm, and after drying at 160 ° C. for 10 minutes, a release layer forming agent, which is a 5% aqueous solution of polyvinyl alcohol, was placed thereon. It was applied by spin coating so that the dry film thickness was about 1 μm, and dried at 160 ° C. for 10 minutes to obtain a glass substrate having a red coating film and a release layer (see FIG. 9H). Next, the red coating film and the release layer of this substrate are passed through a stencil using a krypton-fluorine gas excimer laser, and a laser having a predetermined pattern is irradiated under a condition that one pulse having an energy density of 1200 mj / cm ² has six pulses. Irradiation, decompose and remove the red coating film on the irradiated area, and line / space = 100 μm /
A patterned red coating film having a release layer and having a thickness of 260 μm was obtained (see FIG. (I)).

Next, on the glass plate on which the patterned red coating film was formed, a colored coating film formation, a release layer formation and laser irradiation were performed using the above-mentioned blue coating material in the same manner as described above, and the line / space was 100 μm. / 260 μm, the surface of which was a patterned blue coated film having a release layer “see FIG.

Further, on the glass plate on which the patterned colored coating film was formed, a colored coating film was formed and laser irradiation was performed using the green paint in the same manner as described above (no peeling layer was formed). Space = 100 μm / 260
μm, and a patterned colored coating film having a green surface having no release layer (see FIG. (W)) was obtained.

A substrate having a green surface, on which a three-color patterned colored coating film obtained as described above was formed, was placed at 40 ° C.
The substrate having a three-color patterned colored coating by removing the unnecessary colored coating film and the releasing layer by dissolving the releasing layer by immersing it in a stripping solution of water for 10 minutes, and referring to FIG. Obtained.

The photosensitive black paint obtained in Production Example 4 was exposed by a spin coater on the colored coating surface of the substrate having the three colored colored coating films shown in FIG. Apply so that the grid-like part is filled in.
After pre-drying at 80 ° C for 10 minutes, on the black coating,
Polyvinyl alcohol (degree of polymerization 1,700, Tg point 65
° C, oxygen permeability 2 × 10 ^-14 cc · cm / cm ² · sec · cmH
The 12% aqueous solution of g) was uniformly applied by a spin coating method so as to have a dry film thickness of about 2 μm, and dried at 80 ° C. for 10 minutes to form a cover coat layer.

Then, using a high-pressure mercury lamp from the back side of the substrate obtained as described above (the glass surface side without the coating film),
The entire surface was exposed under the condition of an exposure amount of 400 mj / cm ² .
Since the red, blue, and green colored coating films contain an ultraviolet absorber, when exposed from the back side of the substrate, red, blue,
The ultraviolet light did not sufficiently reach the black coating on the green colored coating, and the black coating in this portion did not cure, and only the black coating embedded in the lattice portion was cured.

After the above-mentioned exposure, development is carried out by spraying with a 0.25% aqueous solution of tetramethylammonium hydroxide at 25 ° C. for 30 seconds, washing with water, drying with water, and baking at 140 ° C. for 60 minutes are performed to form a grid black. A substrate was obtained in which the surface of the glass plate was covered with a matrix and colored patterns of green, blue and red having a thickness of about 2 μm without any gaps (see FIG. (T)).

As a result, a color filter was obtained in which the surface of the glass plate was completely covered with a colored pattern of black (black matrix), green, blue and red having a thickness of about 2 μm. The line width of the black (black matrix) colored pattern was 20 μm, and the line width of each of the blue, red, and green colored patterns was 100 μm. The resulting multicolored pattern was fine and excellent in long-term performance.

[0074]

The method of the present invention is a method for forming a colored pattern by combining the laser ablation method and the removal of an unnecessary coating film by dissolving a release layer. It is possible to form a colored pattern excellent in flatness and free from contamination during polishing. The resin of the coloring paint used for forming the colored coating film does not need to be a photosensitive resin, but can be selected from a wide range, and can improve the pigment dispersibility, the long-term performance of the coloring pattern, and the like. Furthermore, it can be applied to a substrate having a large area, and can stably form a fine colored pattern having excellent long-term performance.

[Brief description of the drawings]

FIG. 1 is a model diagram of a cross section of a substrate, showing an example of steps of a method for forming a colored pattern of the present invention.

FIG. 2 is a model diagram of a substrate plane having a coloring pattern formed by the process shown in FIG.

FIG. 3 is a model diagram of a cross section of a substrate, showing an example of steps of a method for forming a colored pattern according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... 1st coloring coating 3 ... Release layer 4 ... 2nd coloring coating 5 ... 3rd coloring coating 6 ... 4th coloring coating

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Naozumi Iwasawa Kansai Paint Co., Ltd. 4-1-1, Higashi-Hachiman, Hiratsuka-shi, Kanagawa

Claims (5)

[Claims] (1) forming a first colored coating film on a substrate and forming a release layer on the first colored coating film;
(2) a step of irradiating the first colored coating film and the release layer with a laser beam in a pattern by a laser abrasion method to remove the colored coating film and the release layer of the laser light irradiated portion;
(3) If necessary, a colored coating having a different color from the formed colored coating and a release layer on the colored coating are formed on the substrate obtained in the above step (2), and the laser abrasion method Irradiating laser light in a pattern to remove the colored coating film and the release layer in the laser light-irradiated portion, and forming a colored coating film and a release layer of a predetermined pattern having different colors are repeated at least once ( In the case of repeating two or more times, the respective colors of the colored coating films of different colors are different from each other), (4) formed on the substrate obtained in the above step (2) or (3). Forming a colored coating having a color different from any of the colored coatings, and (5) removing and removing unnecessary colored coatings and release layers on the release layer by dissolving the release layer. Method for forming a colored pattern. 2. After the step (4), a step of irradiating the colored coating film with laser light in a pattern by a laser abrasion method to remove the colored coating film on the laser light irradiated portion is performed, and then the step (5). 2. The method according to claim 1, wherein
A method for forming a colored pattern as described above. 3. The method according to claim 2, wherein, after the step (5), a colored film having a color different from all the colors of the colored film is formed on a portion of the substrate surface where the colored film is absent. Of forming a colored pattern. 4. The formation of a colored pattern according to claim 1, wherein the colored coating film forms a colored pattern having four colors of red, blue, green and black (black matrix). Method. 5. The liquid crystal display device according to claim 4, wherein the transparent substrate is formed on a transparent substrate.
A color filter comprising four colored patterns formed by the forming method described above.