JPH02245704A - Production of color filter - Google Patents

Abstract

PURPOSE:To prevent the decoloring and dyeing of a dyed dyeable resin film when a subsequent color filter is formed, by successively treating the resin film with an aq. soln. of tannic acid and an aq. soln. of antimonyl sodium tartrate. CONSTITUTION:A dyeable resin film 6 having a prescribed pattern is formed on a substrate 1 and dyed with a dye having the 1st color. The dyed resin film 6 is washed, immersed in an aq. soln. of tannic acid for several min, washed, immersed in an aq. soln. of antimonyl sodium tartrate for several min, well washed and dried to form a color filter 7 having the 1st color. A color filter 10 having the 2nd color is then formed in the same way. Since the dyed resin film is treated in two steps with the aq. solns., the surface of the film is modified and the redissolution and decoloring of the film by a resin soln. for the subsequent color filter are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a color filter used for, for example, a liquid crystal color television or an imaging device for a color television.

[Conventional technology]

A color filter generally has a structure in which dyed resin films are continuously arranged in a mosaic shape of several different colors, such as stripes, rectangles, dots, etc., and is a typical example of a method of manufacturing a color filter. First, a dyeable photosensitive resin film was formed, selectively exposed to light through a mask having a predetermined mosaic pattern, and developed to form a dyeable photosensitive resin film in a predetermined pattern. After that, this dyeable photosensitive resin film is dyed with a dye that exhibits predetermined spectral characteristics.
Forms a colored filter. Next, by repeating similar steps, color filters of second color, third color, and so on are formed.

Note that a method for manufacturing a color filter is described, for example, in Japanese Patent Publication No. 51286/1986.

(Problems to be Solved by the Invention) As dyeable photosensitive resins, for example, gelatin, casein, etc. to which a photocuring agent (photocrosslinking agent) such as dichromate is added is used. When a dyeable photosensitive resin film is applied to form the next color filter on top of the dyed color filter, the previous color filter swells and redissolves due to the organic solvent in the resin film, causing the previous color filter to dissolve. There is a problem in which the dye is removed and dyed by the dye used to dye the next color filter, resulting in significant color mixing. Generally, the surface of color filters is modified to fix dyes and prevent them from being dyed with subsequent dyes (ie, resist dyeing).

The dye fixation and resist dyeing treatments include treatment with an aqueous solution of tannic acid and acetic acid, followed by treatment with an aqueous antimonyl potassium tartrate solution (see the above-mentioned literature).

However, when gelatin, casein, or the like is used as a photosensitive resin, since these are natural products, they are easily putrefied and their quality is unstable. Therefore, there are problems in that film thickness, dyeability, etc. vary greatly depending on the product, color unevenness occurs, and color reproducibility is poor. In addition, dichromate-based photocuring agents are generally susceptible to the effects of atmospheric temperature, humidity, and standing time during coating and exposure, and require extremely strict control during the work process. For this reason, synthetic polymer-based dyeable photosensitive resins have come into use.For example, a diazo compound, a photocuring agent, etc. Those to which an azide or diazide compound is added are used. When these synthetic resin systems are used, the same problems as above occur, and it is difficult to form color filters with multiple colors. 1. When synthetic resins are subjected to the treatment according to the above literature, the colors are lost and the colors are mixed. occurred. This is considered to be because the resin film swells and becomes brittle due to acetic acid, and the adhesion level decreases.

The present invention was developed as a result of various studies on post-dyeing treatment agents in order to solve the above-mentioned problems. An object of the present invention is to provide a method for manufacturing a color filter that can prevent color filters from being colored or dyed.

[Means to solve the problem]

In order to achieve the above objects, the method for producing a color filter of the present invention involves forming a dyeable resin film having a predetermined pattern on a substrate, and dyeing this dyeable resin film with a dye of a predetermined color. and treating the dyed resin film with an aqueous solution of tannic acid, and further treating the dyeable resin film with an aqueous solution of sodium antimonyl tartrate or potassium antimonyl tartrate at least once. It is characterized by

[Effect]

The dyed resin film is treated with an aqueous solution of tannic acid, and then the dyeable resin film is treated with an aqueous solution of sodium antimonyl tartrate or potassium antimonyl tartrate to form the following color filter. When doing so, it is possible to prevent the resin film from losing its color, being dyed, or becoming brittle.

〔Example〕

FIG. 2 is a schematic cross-sectional view showing an example of a color filter obtained by the method of the present invention. A plurality of color filters 2 of different colors (for example, the three primary colors of red, blue, and green in the case of a color liquid crystal display device or a color solid-state image pickup device) are disposed on a substrate 1.
, 3.4 are provided.

FIGS. 1(a) to 1(i) are schematic process cross-sectional views showing one embodiment of the method for manufacturing a color filter of the present invention.

First, a dyeable photosensitive resin film 5 is deposited on the substrate 1 to a thickness of 0.5 to 2
It is coated on a micrometer (Fig. 1(a)).

Next, a mask with a predetermined pattern is placed on the resin film 5, irradiated with ultraviolet rays, developed, and the unexposed parts are dissolved and removed, leaving only the resin film 6 in the exposed parts (Fig. 2 (b)
).

Next, this resin film 6 is dyed with a first red dye, washed with water, immersed in an aqueous solution of tannic acid (warm water) for several minutes, then washed with water, and further dyed with sodium antimonyl tartrate or antimonyl tartrate. The filter is immersed in a potassium aqueous solution (warm water) for several minutes, thoroughly washed with water, and then dried at a temperature of 80 to 200°C to form a red color filter 7 as the first color (FIG. 1(c)).

Next, the resin film is patterned in the same manner as the second color filter is formed, and dyed with the second color blue dye (9) in Fig. 1(e), and subjected to the dye fixation and resist dyeing treatment described above. A second blue color filter 10 is formed (FIG. 1(f)).

Similarly, a third green color filter 13 is formed (Fig. 1 (g) to (i)). Note that the dye fixation and resist dyeing treatments described above are not necessarily applied to the last color filter 13 formed. You don't have to.

The material components when dyeable acrylic resin is used as the synthetic resin will be described. Examples of the basic skeleton include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, styrene, butyl acrylate, acrylonitrile, and the like.

Examples of dyeability-imparting monomers include 2-dimethylaminoethyl acrylate, 3-dimethylaminopropyl acrylate, N-(2-dimethylaminoethyl)acrylamide, N-(3-dimethylaminopropyl)acrylamide, etc. As the imparting monomer, N-
Examples include vinyl 2-pyrrolidone, methyl vinyl ether, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, etc., and from among these monomers, for example, 3 to 8 combinations are selected and polymerized to form an acrylic resin.

Further, as a photocuring agent added to the resin, a didiazo compound, a bisazide compound, etc. are added to produce a photosensitive dyeable acrylic resin.

Since acrylic resin is a solid powder, it is generally dissolved in an organic solvent such as ethyl cellosolve to bring the concentration of acrylic resin to 1.
Adjust the amount to 0 to 20 wt% and apply.

Next, the table below shows typical examples of the results of studies on various dye fixation and resist dyeing treatments. The steps shown in the figure were performed and evaluated.

Note in the margin below: % is weight % As is clear from the table, in treatment A with only tannic acid,
There was elution of the dyed resin film, indicating that the treatment was insufficient. In addition, in treatments C and D using acetic acid, there was elution of the dyed resin film, and the strength of the resin film itself was reduced by acetic acid.
It was difficult to form a good resin film. moreover,
In the simultaneous treatment E with tannic acid and anticenyl tartrate, there was elution of the dyed resin. In contrast, the two-stage treatment B of tannic acid and anticenyl tartrate according to the present invention
and F, there was no elution of the dyed resin and no decrease in the strength of the resin film itself.

Next, a desirable range of processing conditions will be described.

In the first stage treatment using tannic acid, the content of tannic acid in the aqueous tannic acid solution is 0.2 to 1.0% by weight, more preferably 0.3 to 0.5% by weight. If there is a large amount of tannic acid, crystalline foreign matter will be formed on the resin film. The liquid temperature is 60 to 90°C, more preferably 70 to 80°C, and the immersion time is 1 to 10 minutes, more preferably 7 minutes. The content of antimonyl sodium or potassium tartrate in the antimonyl sodium or potassium tartrate aqueous solution is 0.
02-1.0% by weight, more preferably 0.05-0.2
Weight%. If there is too much sodium or potassium antimonyl tartrate, an insoluble precipitate will form on the resin film. The liquid temperature is 25-90℃.

More preferably, the temperature is 70°C and the immersion time is 1 to 5 minutes, more preferably 3 minutes.

Next, an example in which the present invention is specifically implemented will be described.

A dyeable acrylic resin liquid containing a diazide compound and the above-mentioned photocuring agent is applied onto a glass substrate by a spin-coding method, etc. After drying, a mask with a rectangular pattern is placed on the resin film with a gap of 50 to 100 μm. The resin film was exposed to light from a mercury lamp through this mask, developed, and dried to form a rectangular resin film on the glass substrate. (Nippon Kayakusha I
l) in a 0.4% aqueous solution (liquid temperature 60°C) for 10 minutes, washed with water, and heated to 70°C.
．． After immersing in a 3% by weight aqueous solution for 5 minutes and then washing with water for 2 minutes, 0.1% by weight of sodium antimonyl tartrate was added.
It was immersed in an aqueous solution (liquid temperature 70°C) for 5 minutes, washed with water for 2 minutes, and then dried at a temperature of 150°C for 30 minutes to form a red color filter.

Next, by repeating the same process, 0.2% by weight of green dye GIP (manufactured by Nippon Kayaku Co., Ltd.), which is a mixture of azo and copper complex salts, was added.
After immersing in an aqueous solution (liquid temperature 55°C) for 10 minutes and rinsing with water, dye fixation and resist dyeing were performed in the same manner as above using a tannic acid aqueous solution and an antimonyl sodium tartrate aqueous solution in two stages, followed by drying. A green color filter was formed.

Next, in the same manner, anthraquinone blue dye B43P
(manufactured by Nippon Kayaku Co., Ltd.) in a 0.1% aqueous solution (liquid temperature: 60℃)
) for 10 minutes, washed with water, and dried to form a blue color filter.

In this example, the surface of the red-dyed resin film was modified by performing treatment with an aqueous tannic acid solution and treatment with an aqueous sodium antimonyl tartrate (or potassium antimonyl tartrate) aqueous solution in two steps.
Re-dissolution by the next resin solution, dye removal, and staining by the green dye do not occur, and the resin film does not become brittle due to the processing solution, and the surface of the resin film dyed green in the same way is modified. A high quality three primary color filter could be obtained without being adversely affected by the subsequent blue color filter formation and processing solution.

It goes without saying that the present invention is not limited to the above embodiments, and can be modified in various ways without departing from the spirit thereof.

〔Effect of the invention〕

As explained above, in the method for manufacturing a color filter of the present invention, by forming the following color filter, it is possible to prevent color loss and dyeing, and also to perform dye fixation treatment and dyeing. Since the resistance dyeing treatment does not reduce the strength of the resin film of the color filter, it is possible to obtain a high quality multicolor color filter.

Therefore.

The quality and product yield of liquid crystal color televisions, color television imaging devices, etc. using color filters can be improved.

[Brief explanation of drawings]

1(a) to (i) are schematic process sectional views showing one embodiment of the method for manufacturing a color filter of the present invention, and FIG. 2 is a schematic process sectional view showing an example of a color filter obtained by the method of the present invention. FIG. 1... Substrate 2.3, 4... Color filter 5.8.11... Resin film 6.9.12... Patterned resin film 7.10.1
3... Resin film that has been dyed, dye-fixed and resist dyed

Claims (1)

[Claims] 1. Form a dyeable resin film with a predetermined pattern on a substrate, dye this dyeable resin film with a dye of a predetermined color, and dye the dyed resin film with an aqueous solution of tannic acid. A method for producing a color filter, comprising the steps of treating the dyeable resin film with an aqueous solution of sodium antimonyl tartrate or potassium antimonyl tartrate at least once.