JPH0429202A - Production of color filter - Google Patents

Abstract

PURPOSE:To obtain the color filter with which the production process is easy and which has excellent smoothness by applying a positive resist on a layer to be dyed and subjecting the resist to imagewise exposing, then developing and dyeing the layer to form 1st color picture elements, subjecting the resist at different points to the imagewise exposing, then processing the resist in the same manner to form 2nd and further another color picture elements. CONSTITUTION:The layer 12 to be dyed is applied on a light transparent substrate 11 and the positive type resist is applied on the layer 12. After a substrate 11 provided with the positive type resist is subjected to the imagewise exposing, the exposed parts of the resist are removed by developing and thereafter, the 1st color picture elements B are formed by dyeing and are subjected to fix processing. The points different from the picture elements B are then, subjected to the imagewise exposing and are developed in the same manner; thereafter, the 2nd color picture elements G are formed by dyeing and are subjected to the fix processing. The picture elements C, etc., having the spectral characteristics different from the spectral characteristics of the picture elements B, G are formed similarly at need by as much as the required number of colors. The color filter with which the production process is easy and which has the excellent smoothness is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a color filter, and more particularly to a method for manufacturing a color filter suitable for use in a color liquid crystal display.

[Background of the invention]

As a method for manufacturing color filters,
As described in No. 286, etc., a mordant layer consisting of a natural polymer compound such as ceratin, gryu, or a synthetic polymer compound such as borihinyl alcohol is provided on a substrate, and the mordant layer is exposed to light, treated, etc. A dyed filter manufacturing method is known in which, after patterning, the relief image is dyed with a dye to form a colored layer.

In such a method, there are many dyes that can be used, and it is relatively easy to match the color characteristics required for the filter, and it requires exposure and processing each time one leaf of mordant layer is formed for each color. In some cases, a complicated process such as providing an intermediate layer for resist dyeing is required, which causes problems in yield and smoothness and increases costs.

In addition, the same dyed color filter is also available in Special Publication No. 521737.
As described in No. 6, etc., there is also a method of creating a color filter by dyeing using a patterned resist each time a pixel of each color is formed on the mordant layer without forming relief on the mordant layer. However, even with this method, there are steps of resist coating, exposure, processing, and peeling for each color, so it is difficult to say that it is an easy method.

[Purpose of the invention]

An object of the present invention is to provide a method for manufacturing a color filter that is easy to manufacture and has excellent smoothness.

[Structure of the invention]

The above-mentioned object of the present invention is to provide a method for manufacturing a color filter having pixels of at least two colors having different spectral characteristics on a light-transmitting substrate, which includes the steps of: a) applying a layer to be dyed; b) applying a positive layer on the layer to be dyed; Step C) Applying a mold resist onto the substrate provided with the positive resist, after imagewise exposure, developing and removing the exposed portion of the resist, and then dyeing the substrate to form a first resist.
Step d) of creating a second color pixel and fixing it; d) After imagewise exposure to a location different from the pixel, developing in the same manner as above, creating a second color pixel by dyeing, and fixing it; e) If necessary, create pixels of the required number of colors in the same manner as above, f) If there is any resist remaining on the substrate, remove it. This is achieved by a color filter manufacturing method including a step of removing.

The present invention will be explained in more detail below.

The dyeable polymer compound that can be used as the mordant layer used in the present invention is usually used in the dyeing process with water or a hydrophilic solvent (e.g. alcohol such as methanol or ethanol, cellosolub such as methyl cellosolve or ethyl cellosolve). Considering that glycols such as ethylene glycol, propylene glycol, and the like (hereinafter the same) are used, resins that have swelling properties are preferred.

Among these dyeable polymer compounds, examples of natural polymer compounds include celestial polymer proteins such as seratin, caseino, and gutsy. Synthetic polymer compounds such as polyvinyl alcohol, acrylic synthetic resins containing dyeable functional groups, and water-soluble nylon/poval/stilhazole resins are also preferably used.

In the present invention, it is preferable that the layer to be dyed contains a mordant, and it is more preferable that the mordant is contained in a weight ratio of 1/10 to 10 to the dyeable polymer compound.

Preferred types of mordant include the following general formulas (1) to (
It is not limited to those shown in IV) or mentioned above.

General formula (1) % formula % In the formula, A is a monomer unit containing at least two ethylenically unsaturated groups, B is an α,β-ethylenically unsaturated monomer unit, and R is a hydrogen atom, a methyl group, or Represents an ethyl group. X, Y, and Z indicate molar ratios, and X is 0 to 5 moles.
°, y is 0 to 90 mol 0°, and 2 is 10 to 100 mol%.

General formula (I[) i + A + group, R4 is an alkyl group, an aralkyl group,
cycloalkyl group or chloroalkylalkyl group, xQ
represents an anion, X is 0.5 to 6.0, y is Q-79
, 5, 2 are 20 to 995.

General formula (II[) + A +X + B -+'t +CH2-CH+z
In the formula, A and B have the same meanings as A and B in general formula (1), Q represents a nitrogen atom or a phosphorus atom, and Rl
, R2 and R3 each represent a group selected from the group consisting of a carbocyclic group and an alkyl group.

M9 represents an anion, X is about 0.25 to about 5 mol%,
y is about 0 to about 90 mol%, and Z is about 10 to about 99 mol%.

General formula (IV) where unit A is derived from one or more α,β-ethylenically unsaturated monomers, and R is a hydrogen atom or a carbon atom number of 1 to
6 is a substituted or unsubstituted alkyl group, Q is a substituted or unsubstituted alkylene group, arylene group, arylene alkylene group, or -COOR3- or -CONIIR3- group (
In the formula, R3 represents a substituted or unsubstituted alkylene group, arylene group, or arylene alkylene group. R1 is a hydrogen atom, a substituted or unsubstituted alkyl group or an aryl group, or together with Q, each X is a leaving group capable of being removed by a nucleophile, each Y
is a hydrogen atom, an inert (non-leaving) group or -(NH)pQ-
The bonds bonded to E and F each represent a single bond or a group of atoms necessary to combine to complete a 5- to 7-membered heterocycle, n is 0, 1, or 2, and m is 12 or 3, the sum of n+m is 3 or less, and p is O or 1. X is 0 to 90% by weight of the polymer, and y is 10 to 100% by weight of the polymer.

General formula (V) →CH, -C+X -+ M+y -+V+ zX
R' In the formula, Q represents a nitrogen or phosphorus atom, Rl, R2 and R8 each represent a carbocyclic group or an alkyl group, and R4 represents hydrogen or an alkyl group. Xo is an anion, ■ is a residue of a monomer containing at least two polymerizable ethylenically unsaturated residues, M is a residue of a monomer containing a polymerizable ethylenically unsaturated residue, and Xy and Z are The numbers characterizing each proportion of the individual comonomers: X stands for 10-99 mol%, y stands for 0-90 mol%96, Z stands for 0-5 mol%.

In addition, the water-soluble dye used in the present invention may be acid dye T4, direct dye, reactive dye, or cationic dye that can be dissolved in water, a hydrophilic solvent, or a mixture of both, and commercially available dyes may be used as they are. or preferably used after being purified. Among these, acid dyes are particularly preferred.

Specifically, Suminol Firstlet G (C, 1, Ac1d Redl18, manufactured by Sumitomo Chemical Co., Ltd.) and Kayanol Milling Renot''R5 (C
[8cid Redl14, manufactured by Nippon Kayaku Co., Ltd.], Tianonod First Let 3BL (C, 1, Ac1d
Red158, manufactured by Mitsubishi Chemical Industries, Ltd.), Kayanol 1
'Nirow NGS (CAcid YellowllO1
Nippon Kayaku Co., Ltd.), Suminol First Ye o-G (
C,1,Ac1d Yellow61, manufactured by Sumitomo Chemical Co., Ltd.), Arsaline Green (C,1,Ac1dGree
n9, manufactured by Tokyo Kasei Kogyo Co., Ltd.), Fu IJ IJ Ant India Blue 5C (C, 1, Ac1d BIue103,
Hetost), Kayanol Cyanine 6B (CAc
id Blue83, manufactured by Nippon Kayaku Co., Ltd.), annodic cyanine 7BFH (C, 1, Ac1d BlueOO1 manufactured by Hodogaya Chemical Industry Co., Ltd.), Rhett 136P, Rhett 137
P, Blue 5P, Blue 43P1 Green CFG-
111SPC cyan 2P, PC cyan +6 (on JJ,
(manufactured by Nippon Shisosha) Black 006P, Black+8IP, and reactive dyes such as Plon.
Brilliant Yellow - H-5G (C, 1, Reactive Ye
low2, made by Nippon Shisosha), Diamira Brilliant
GD
(C, 1, Reactive Red63, manufactured by Mitsubishi Chemical Industries, Ltd.), Mikanoon Green 2BS (C, 1, Reactive
active Green7, manufactured by Nippon Shisousha), Sumifix Navy Blue R (C, 1, ReacLive
Blue20, produced by Sumitomo Chemical Co., Ltd.), and direct dyes such as Direct Fast Ix o -GN (
C, 1, Direct Yellow 85, manufactured by Nippon Shisosha), Sumilight Lett 4B (C, 1, Direct
t Red81, manufactured by Sumitomo Chemical Co., Ltd.), Kayaras Supra Blue BWL (C, 1, DirectBlue23
7, made by Nippon Shisosha), Eisen Green GX (C
, 1, Direct Green 8, manufactured by Sumitomo Chemical Industries, Ltd.), or two or more thereof can be applied.

As a dyeing method, the above-mentioned dye is added to water at 0.01~
The layer to be dyed and the base material provided with the Renost pattern may be immersed in a dye bath containing 5%, preferably 0.005 to 29°C, at 40 to 90°C for 1 to 30 minutes.

As a positive type instrument according to the present invention, FBM120
FBM-110, FPM (all manufactured by Daikin), 0
EBR-1013, CF2 (Tokyo Ohka type), E
BR-1, EBR-9 (all manufactured by Toshi), FMRE10
2 (Fuji Yakuhin type), MCP-1400, ll5-1
9 (all manufactured by Cyprefer East), etc.

The light-transmitting substrate used in the present invention may be transparent or semi-transparent as long as it has light-transmitting properties. Furthermore, since the color filter is sometimes exposed to high temperatures during the vapor deposition process of transparent electrodes, it is preferable that the material of the substrate has good tenacity.

Examples of materials that make up such a light-transmissive substrate include:
Examples include polymeric compounds such as polyethylene terephthalate, polybutylene terephthalate, polystyrene, polycarbonate, polyether sulfone, polyvinyl alcohol and cellulose acetate, glasses such as soda glass and borosilicate glass, and inorganic substances such as quartz and sapphire. Something comes up.

The light-transmitting substrate can be used in the form of a plate, notebook, or film using the above-mentioned materials.

The thickness of the light-transmitting substrate can be set appropriately depending on the application and material, but is usually 0.5 μm to 10 mm.
is within the range of In particular, when glass is used as a light-transmissive substrate for a liquid crystal color display, the thickness is preferably within the range of 03 to 2+am.

〔Example〕

EXAMPLES Next, the present invention will be explained in more detail with reference to Examples. Note that 9°C in the examples represents weight % unless otherwise specified.

Example 1 A 39o aqueous solution of seratin containing 40 mg and 5 mg of the following compounds H-1 and H2 as hardeners and 1 g of the following compound M-1 as a mordant per 1 g of gelatin was added to a 1.1 mm thick transparent solution. Boron glass substrate (10
cmx locm) to form a layer to be dyed by applying it with a spinner to a dry film thickness of Igm.

Next, on the substrate on which the layer to be dyed has already been formed, a printing/imprinting/styling method (MCP-1400 manufactured by NPLAY FAR EAST) is applied.
Apply with a spinner to a coating thickness of 15 μm.
, forming a renst layer.

CH+ CHCH20(C)Iz)+5i(OCH
+)+H-2 [(CH2= CH30+CL)sCCLSolCH2
CH2EINCHICH2SO+hCH.

Next, a method for manufacturing a color filter having a mosaic pattern of three colors (blue), G (green), and R (red) as shown in FIG. 1 will be described below.

Note that the size of each pixel is 150 μz×150 μm.

A chromium mask for a color filter having a square opening of 150 μm on one side was layered on the glass substrate (abbreviated as substrate A) having the above-mentioned positive resist layer, and a first exposure was performed using a mercury lamp. . Exposure was carried out at a position corresponding to part B in FIG.

After patterning the resist by developing a resist on the exposed substrate A, a blue dye aqueous solution containing 0.025% blue dye Blue5P (manufactured by Nippon Shiso Co., Ltd.) at 40°C and adjusted to pH 5 with a 56% acetic acid aqueous solution was added. After soaking for a minute,
A fixation process was performed by immersing the film in a 1% aqueous solution of tannic acid and tartarite at 50° C. for 1 minute to create a blue light transmitting pixel.

Next, another chromium mask for color filter is placed on the substrate A after the above processing so that the exposed area becomes the part G in FIG. 1, exposed in the same way, and the resist is developed.
40 containing 0.54'6 green dye CFG-Ill (manufactured by Nippon Shisosha) and adjusted to pH 5 with a 56% acetic acid aqueous solution.
After being immersed in a green dye aqueous solution at °C for 4 minutes, a fixation process was performed in the same manner to create a green light transmitting pixel.

Next, the entire surface of the substrate A after the above treatment was exposed to light and subjected to a resist phenomenon, and then heated at 60°C with a 56% acetic acid aqueous solution containing 03% red dye Re+ll37P (manufactured by Nippon Shisosha Co., Ltd.) at a PL of 5. A red light transmitting pixel was created by immersing it in a red dye aqueous solution for 20 minutes. The color filter thus produced was designated as sample CF1.

Comparative Example 1 A color filter was prepared according to the example of Japanese Patent Publication No. 61-51286 using a dyeing method in which the layer to be dyed was patterned for each color pixel, and was designated as sample CF-2.

Comparative Example 2 According to the example of Japanese Patent Publication No. 52-17376, a color filter was prepared by applying a resist and patterning each time each color pixel was dyed, and designated as sample CF-3.

Example 2 Color filter sample CF- thus obtained
The smoothness level of the surface of the color filters 1 and 2 was determined using Taly Step manufactured by Kiki Rank Taylor Hobson. Measurements were taken at 30 locations for each R pixel, and the average of the total of 90 locations was calculated.
．． 08μm, while CF-2 is 0.41μm
there were.

〔Effect of the invention〕

The color filter based on the manufacturing method of the present invention requires less number of times of dyeing layer, lenost coating, and buttering than color filters made by other dyeing methods, and the manufacturing process is easy and low cost, and the surface smoothness is low. It is also excellent.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a color filter obtained by the manufacturing method of the present invention, and FIG. 2 is a cross-sectional view showing an example of a liquid crystal color display using the color filter obtained by the manufacturing method of the present invention. It is a diagram. 11 Light-transmitting substrate 12-Colored portion 24 Color filter 25a, 25b Polarizing plate 26 Liquid crystal 27a,
27b-electrode

Claims (1)

[Claims] A method for manufacturing a color filter having pixels of at least two colors with different spectral characteristics on a light-transmitting substrate, comprising: a) applying a layer to be dyed on the light-transmitting substrate; b) the dyeing layer; c) Step of applying a positive resist on the layer c) After imagewise exposure to the substrate on which the positive resist is provided, after developing and removing the exposed part of the resist, a first resist is applied by dyeing.
Step d) of creating a second color pixel and fixing it; d) After imagewise exposure to a location different from the pixel, developing in the same manner as above, creating a second color pixel by dyeing, and fixing it; e) If necessary, create pixels of the required number of colors in the same manner as above, f) If there is any resist remaining on the substrate, remove it. A method for producing a color filter, comprising a step of removing it.