JP2002287129A - Color filter substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter substrate comprising a plastics substrate coated with a novel overcoat layer which is film formed at low temperature and in a short time and which is excellent in smoothness, adhesion property to a transparent electrode (ITO(indium tin oxide)) and scratch resistance of the obtained coating film. SOLUTION: The color filter substrate is characterized by coating the plastics substrate with the overcoat layer, which is obtained from a composition for over-coating containing an organometallic compound (A), expressed by a general formula (1), R<1> m M(OR<2> )n (where M is a metal element, R<1> is a hydrogen atom, an alkyl group or an alkyl group with a functional group, optionally identical or different respectively, R<2> is a hydrogen atom, an alkyl group or an acyl group, optionally identical or different respectively, n is an integer equal to one or more and further m+n coincides with the atomic valence of the metal element M), and/or its hydrolyzed and condensed product, a polar group containing polymer (B) and a silane coupling agent (C) having a functional group capable of reacting with the polar group containing polymer (B) in the molecule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel color filter substrate and a liquid crystal display (hereinafter, also referred to as a liquid crystal display or simply an LCD) using the same. Specifically, indium tin oxide (hereinafter, referred to as ITO), which can be firmly formed at a low temperature and can be applied to a plastic substrate having low heat resistance, and has abrasion resistance, stain resistance, solvent resistance, surface smoothness, and a transparent electrode. The present invention relates to a color filter substrate coated with an overcoat layer having excellent adhesion to a color filter substrate and a liquid crystal display device using the same.

[0002]

2. Description of the Related Art There are liquid crystal displays, such as notebook type personal computers and word processors, small televisions, vacuum cleaners, radio-cassettes, watches, etc., with liquid crystal displays, and display devices for telephones including mobile phones and rice cookers. Liquid crystal display devices (liquid crystal displays) are now used in many products around us, from time display, car navigation, to game consoles. This is because a liquid crystal display has advantages such as lower power consumption required for a display operation and easier reduction in size and weight than other display devices. Furthermore, a liquid crystal display that has conventionally been a monochrome display has been replaced by a liquid crystal display that can display image information other than character information in color.

[0003] An important key to the future of a liquid crystal display in which colorization is progressing at a rapid pace is a color filter substrate (in this specification, a colored layer, a black matrix, an overcoat layer, and a transparent electrode are formed on the substrate. Are collectively referred to simply as a color filter substrate.) The liquid crystal, the TFT element, and the driving circuit have a basic function of a display called an optical switch. In contrast, a color filter substrate is often considered to be a simple function of coloring a liquid crystal display by combining it with a liquid crystal, but in fact, it has a large effect on contrast and display reflection, and affects the picture itself. In addition, the color filter substrate accounts for a large part of the manufacturing cost of the liquid crystal display. From these points, it can be said that the color filter substrate is a key component of the liquid crystal display.

[0004] Among them, the above color filter base material includes:
A glass substrate excellent in heat resistance, chemical resistance, smoothness, transparency, scratch resistance, etc. is used, and a black matrix agent and a colorant for RGB three primary color pixels are formed on the glass substrate excellent in heat resistance. By applying an overcoat agent, a transparent electrode agent and the like, and drying and curing at a high temperature, a film can be formed in a short time, so that the production time can be shortened and the productivity can be improved.

However, a display panel using a glass base material is heavy, and a liquid crystal display using a light and durable plastic as a substrate has become mainstream due to a problem such as being heavy and being broken by an impact when dropped or hit by a hard object. Is coming. A liquid crystal display using such a plastic substrate can be made extremely light and thin compared to a glass substrate, and can withstand impact, can be formed into any shape, for example, a curved surface, and can have high transparency. Due to the advantages described above, the market has been greatly expanded mainly for laptop monitors and notebook computers, and also for mobile phones and portable game machines. In addition, mobile phones with an Internet connection function are rapidly spreading, and next-generation mobile phones will not only have voice information, but also large-capacity text and images (including figures, moving images, and stereoscopic images).
Because high-speed communication of information is possible, the development of large liquid crystal panels that can display more characters and image information at a time is urgently needed.Development of increasingly lightweight, thin, and highly reliable plastic substrates Is becoming important.

Further, the properties required for the overcoat layer formed using the overcoat agent include heat resistance, chemical resistance, stain resistance, smoothness, transparency, scratch resistance, coatability, and the like. Adhesion with ITO, which is a transparent electrode, is required.

In a display other than a liquid crystal display, a color filter substrate using a glass substrate is used as a substrate. However, the display can be made very lighter and thinner than a glass substrate, and it is strong against impact. Shape, for example, it can be formed into a curved surface and has advantages such as high transparency.Therefore, it is desired to use a plastic substrate as in the case of a liquid crystal display. There is no difference from a liquid crystal display in that a color filter substrate coated with an overcoat layer having excellent film-forming properties is required.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a color filter substrate in which a novel overcoat layer is coated on a plastic substrate and a liquid crystal display device having the same.

Another object of the present invention is to provide a color filter substrate comprising a plastic substrate coated with a novel overcoat layer which can be formed in a short time at a low temperature, has a short production time, and is excellent in productivity. And a liquid crystal display device having the same.

Another object of the present invention is to form a film in a short time at a low temperature (lower than the heat resistant temperature of a plastic substrate).
Short production time, excellent productivity, smoothness of the obtained film,
A color filter substrate obtained by coating a plastic substrate with a novel overcoat layer which is excellent in adhesion to a transparent electrode (ITO) and abrasion resistance and can satisfy the high performance required for the overcoat layer, and a liquid crystal having the same A display device is provided.

More specifically, a film can be formed in a short time at a low temperature (a temperature lower than the heat-resistant temperature of a plastic substrate), the production time is short, the productivity is excellent, the smoothness of the obtained film, the transparent electrode (ITO) and the like. A new plastic overcoat layer that excels in the high performance required for overcoat layers such as coatability, transparency, heat resistance, chemical resistance, and stain resistance. An object of the present invention is to provide a color filter substrate coated with a material and a liquid crystal display device having the same.

[0012]

These objects are attained by the following (1) and (2).

(2) A plastic substrate has the following general formula (1)

[0014]

Embedded image

(Where M is a metal element and R
¹ may be the same or different and represents a hydrogen atom, an alkyl group, or an alkyl group having a functional group; R ² may be the same or different and represents a hydrogen atom, an alkyl group, or an acyl group; Is an integer of 1 or more, and m +
n is equal to the valence of the metal element M. A) a polar group-containing polymer (B), and a silane cup having a functional group capable of reacting with the polar group-containing polymer (B) in the molecule. A color filter substrate, which is coated with an overcoat layer obtained from a composition for overcoat containing a ring agent (C).

(2) A liquid crystal display device having the color filter substrate according to (1).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The color filter substrate of the present invention comprises an organometallic compound (A) represented by the above general formula R ¹ _mM (OR ² ) _n and / or a hydrolytic condensate thereof and a polar group-containing compound. Polymer (B) and the polar group-containing polymer (B)
And a plastic substrate coated with an overcoat layer obtained from an overcoat composition containing a silane coupling agent (C) having a functional group capable of reacting with a silane in the molecule. Thereby, the organometallic compound (A)
Heat resistance, chemical resistance, abrasion resistance, flexibility with polar group-containing polymer (B), low temperature film formability, uniformity of film with silane coupling agent (C) due to three-dimensional crosslinked structure by hydrolysis and condensation of , Chemical resistance, scratch resistance, smoothness,
Low temperature (temperature lower than the heat resistance temperature of the plastic substrate)
Thus, a film can be formed in a short time, and the productivity is excellent, and furthermore, the obtained film has excellent performance such as transparency, smoothness, and scratch resistance, and further has a coating property and a transparent electrode (ITO). It can provide a color filter substrate in which a plastic substrate is coated with a new overcoat layer that can meet the high performance requirements of overcoat layers such as adhesion, heat resistance, chemical resistance, and stain resistance. is there.

Hereinafter, the present invention will be described in accordance with the constituent elements.

First, as a plastic substrate that can be used in the present invention, required characteristics (for example, mechanical characteristics, optical characteristics, etc.) of a color filter substrate of a liquid crystal display device are used.
Depending on the optimal substrate should be appropriately selected, smoothness, scratch resistance, heat resistance, flexibility, transparency, moisture resistance,
The material is not particularly limited as long as it has characteristics required for the base material such as chemical resistance (solvent resistance) and stain resistance.

Specific examples include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene-2,6-naphthalate, polybutylene terephthalate and copolymers thereof, and polyamides. , Polystyrene, poly (meth) acrylate, polyacrylonitrile, polyvinyl acetate, polyarylate such as polycarbonate, cellophane, polyimide, polyetherimide, polysulfone, polyethersulfone, polyetherketone, ionomer resin, fluororesin, etc. Thermosetting resin such as melamine resin, polyurethane resin, epoxy resin, phenol resin, unsaturated polyester resin, urea resin, alkyd resin, silicon resin Butter, and the like can be mentioned. Preferred are polycarbonate and polyarylate from the viewpoint of heat resistance, mechanical strength, transparency, moldability, antireflection property and the like.
These may be used alone or in combination of two or more.

In addition, these substrates themselves may be formed of multiple layers of materials having different properties in order to obtain required characteristics that cannot be obtained with a single material.

The shape of the plastic substrate is not particularly limited and should be appropriately selected according to the intended use. More specifically, in addition to a film shape, a sheet shape, and the like, these materials can be appropriately formed into a desired shape such as a panel having a curved surface by further utilizing the characteristics of plastic.

Since the thickness of the plastic substrate varies depending on the intended use, it is difficult to uniquely define the thickness.
It should be appropriately selected according to the application.
１０００1000 μm, preferably 10-500 μm, more preferably 100-300 μm. If the thickness of the substrate is less than 5 μm, the surface smoothness is inferior, which causes image defects, and it is not preferable because sufficient strength cannot be maintained as a surface panel. On the other hand, 100
If the thickness exceeds 0 μm, it is not preferable because it may be difficult to satisfy the demands for so-called portable devices, such as lightness and small size, in addition to disturbance of images.

Before forming a colored layer or a black matrix layer on the substrate, the surface of the plastic substrate is subjected to plasma treatment or corona discharge treatment in advance, or the surface of the plastic substrate is treated with oxygen. It is preferable to irradiate an ultraviolet ray having a wavelength of about 200 to 400 nm in an atmosphere containing.

Further, depending on the adhesion state of dirt to the plastic substrate, a coloring agent, a black matrix agent,
Further, when the composition for overcoating cannot be uniformly applied by repelling or the like, it can be improved by washing or modifying the surface of the plastic substrate. Methods of cleaning and surface modification include degreasing cleaning with an organic solvent such as alcohol, acetone, and hexane, cleaning with an alkali or acid, polishing the surface with an abrasive, cleaning methods such as ultrasonic cleaning, and ultraviolet irradiation treatment. And surface modification methods such as ultraviolet ozone treatment, plasma treatment, corona discharge treatment, and heat treatment.

Next, an organic metal compound (A) represented by the above general formula R ¹ _mM (OR ² ) _n and / or a hydrolyzed condensate thereof and a polar group-containing polymer are formed on the plastic substrate. (B) and an overcoat layer obtained from an overcoating composition containing a silane coupling agent (C) having a functional group capable of reacting with the polar group-containing polymer (B) in the molecule. is there.

Here, the overcoat composition is
An organometallic compound (A) represented by the above general formula R ¹ _mM (OR ² ) _n and / or a hydrolytic condensate thereof, a polar group-containing polymer (B), and the polar group-containing polymer (B) Any material containing a silane coupling agent (C) having a functional group capable of reacting in the molecule as a main raw material may be used. Therefore, in the composition for overcoat, as long as the effect of the present invention is not impaired, a curing catalyst, a wettability improver,
Various inorganic and organic additives such as a plasticizer, an antifoaming agent, and a thickener may be contained as raw materials used. In addition, when an appropriate solvent that dissolves these is used, these solvents are also included unless otherwise limited.

The overcoating composition is defined by its raw materials in accordance with the method and process of manufacturing the overcoat layer, which will be described later, such raw materials, reaction products of the raw materials, hydrolysis condensates, and the like. Are mixed (for example, those containing the used raw material before the reaction and its hydrolysis-condensation product, those containing the reaction product by reacting the used raw material, and those subjected to the hydrolysis-condensation of the used raw material and the reaction product) Components, and those containing co-hydrolysis-condensation of the reactants and the raw materials used, and the composition of the components varies depending on the manufacturing process, etc.). It is. That is, it goes without saying that the component composition of the overcoat composition changes over time in accordance with the manufacturing process. The intended meaning of the overcoat composition is to be interpreted, and should not be interpreted as being distorted in any way.

Among them, the organometallic compound (A), which is one of the main raw materials of the overcoat composition,
Is represented by the general formula (1).

The organometallic compound (A) imparts heat resistance, chemical resistance (solvent resistance), stain resistance, durability, water resistance, flexibility, transparency, and moisture resistance to the overcoat layer. Since it is used for the purpose, it is sufficient that the object can be achieved. However, since it is difficult to form a film quickly at a low temperature using only the organometallic compound (A), the polar group-containing polymer (B) and a functional group capable of reacting with the polar group-containing polymer (B) Is used in combination with the silane coupling agent (C) having in the molecule thereof, a compound having excellent low-temperature film formability can be obtained.

In the above formula, n is an integer of 1 or more, and m + n matches the valence of the metal element M. Specifically, n is an integer of 1 or more, m is an integer of 0 or more, and m + n matches the valence of the metal element M. For example, when the metal element M is Si, m + n = 4
From the viewpoint of heat resistance and flexibility of the overcoat layer, m = 0 and n = 4 are preferable.

As the organometallic compound (A) represented by the general formula (1), specifically, the metal element M is S
i is tetramethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, n-propyltrimethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane, tetraethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, n-propyltri Ethoxysilane, dimethyldiethoxysilane, tetraisopropoxysilane, tetra-n-butoxysilane, tetraisopropoxysilane, tetrabutoxysilane, methyltriisopropoxysilane, methyltributoxysilane, ethyltriisopropoxysilane, ethyltributoxysilane, Dimethyldiisopropoxysilane, dimethyldibutoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, diethyldiisopropoxysilane, diethyl Jibutokishishiran, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl triisopropoxysilane, vinyl tributoxysilane silane,
γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, alkoxysilanes such as γ-methacryloxypropyltriethoxysilane, tetrahydroxysilane, trimethylsilanol, tetraacetoxysilane, Methyltriacetoxysilane, titanium ethoxide in which the metal element M is Ti, titanium tetraisopropoxide, titanium alkoxides such as titanium tetrabutoxide, and complex compounds stabilized with acetylacetone and the like, and the metal element M is Zr Stabilized with zirconium alkoxides such as zirconium tetraethoxide, zirconium tetraisopropoxide, zirconium tetrabutoxide, and acetylacetone Examples of these complex compounds include aluminum alkoxides such as aluminum triethoxide, aluminum triisopropoxide and aluminum tributoxide in which the metal element M is Al, and these complex compounds stabilized with acetylacetone and the like. . From the viewpoints of film forming easiness and versatility, preferred are tetramethoxysilane and tetraethoxysilane. One or more of these can be used.

In addition, the overcoat composition may contain a hydrolyzed condensate of the organometallic compound (A) in view of film formability at low temperature and uniformity of film. This is because it is preferable to use hydrolysis-condensation to increase the molecular weight before use. The hydrolysis and condensation in this case can use a known acid, a catalyst such as a base,
Of course, two or more kinds of the organometallic compounds (A) can be used.

Next, the polar group-containing polymer (B), which is one of the main raw materials of the overcoat composition, is used.
Is used mainly for the purpose of imparting adhesion and flexibility to a plastic substrate or a transparent electrode or the like to the overcoat layer, so long as the object can be achieved. ) Is not particularly limited as long as it has a polar group in the molecule.

Here, the polar group is not particularly limited, and examples thereof include a hydroxyl group, an amino group, an amide group, and a carboxyl group. It is preferably an amino group from the viewpoint of easy film formation. These polar groups may have one or two or more different types in the molecule.

Specific examples of the above-mentioned polar group-containing polymer (B) include polyvinyl alcohol, ethylene-vinyl alcohol copolymer, and (co) -hydroxyl group-containing (meth) acrylate such as 2-hydroxyethyl (meth) acrylate.
Hydroxyl group-containing polymers such as polymers: "Epomin Series" (Nippon Shokubai Co., Ltd.) (Epomin SP-003, Epomin SP-006, Epomin SP-012, Epomin SP
-018, Epomin SP-103, Epomin SP-11
0, Epomin SP-200, Epomin SP-300, Epomin SP-1000, Epomin SP-1020 are all trade names. ) And other polyalkyleneimines such as polyethyleneimines, PAA manufactured by Nitto Boseki Co., Ltd.
-L "and" PAA-H ", and amino group-containing (meth) acrylates such as dialkylaminoalkyl (meth) acrylates such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate. ) Amino group-containing polymers such as polymers: Amide group-containing polymers such as polyacrylamide:
Examples thereof include carboxyl group-containing polymers such as poly (meth) acrylic acid and (meth) acrylic acid copolymer. These may be used alone or in combination of two or more. From the viewpoints of transparency, flexibility, adhesion to ITO, and film formability at low temperatures, polyalkylene imines are preferable, and polyethylene imine is particularly preferable.

The polar group-containing polymer (B) has a number average molecular weight of 250 to 200,000, preferably 250 to 100,000.
More preferably, it is in the range of 300 to 10,000. When the number average molecular weight is less than 250, the formed overcoat layer is inferior in flexibility and low-temperature film formability, whereas when the number average molecular weight is more than 200,000, the formed overcoat layer may be inferior in transparency. In addition, the flexibility of the overcoat layer may be poor. However, the polar group-containing polymer (B) that can be used in the present invention includes those having a complicated structure that cannot be measured by the number average molecular weight specified above. The average molecular weight does not exclude these from the present invention.

Next, the silane coupling agent (C), which is one of the main raw materials used for the overcoat composition, contains a functional group capable of reacting with the polar group-containing polymer (B) in the molecule. What is necessary is just to have. The use of the silane coupling agent (C) has an effect of imparting uniformity, smoothness, chemical resistance, crack resistance and pinhole resistance of the obtained film.

The functional group capable of reacting with the polar group-containing polymer (B) depends on the type of the polar group of the polar group-containing polymer (B).
(Meth) acrylic group, isocyanate group, thioisocyanate group, oxazolinyl group, vinyl group, mercapto group, halogen group, carboxyl group, aldehyde group, ketone group, alkyl halide group, etc., preferably, polar group It is an epoxy group from the viewpoints of ease of reaction with an amino group, which is a suitable polar group of the polymer (B), and hot water resistance.

Specific examples of the silane coupling agent (C) include γ-aminopropyltrimethoxysilane, γ
-Aminopropyltriethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β (aminoethyl) -γ- Aminopropyltriethoxysilane, N-β
(Aminoethyl) -γ-aminopropylmethyldimethoxysilane, N-β (aminoethyl) -γ-aminopropylmethyldiethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyl Amino group-containing silane coupling agents such as triethoxysilane; γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltriisopropoxysisilane, γ-glycidoxy Propylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane, β- (3 , 4-Epoxycyclohexyl) ethyl Epoxy group-containing silane coupling agents such as lysopropoxysilane, β- (3,4-epoxycyclohexyl) ethylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethylmethyldiethoxysilane; γ- (meth) Acryloxypropyltrimethoxysilane, γ- (meth) acryloxypropyltriethoxysilane, γ- (meth) acryloxypropylmethyldimethoxysilane, γ- (meth)
(Meth) acryl group-containing silane coupling agents such as acryloxypropylmethyldiethoxysilane; γ-isocyanopropyltrimethoxysilane, γ-isocyanopropyltriethoxysilane, γ-isocyanopropylmethyldimethoxysilane, γ-isocyanate Isocyanate group-containing silane coupling agents such as nopropylmethyldiethoxysilane; vinyltrimethoxysilane, vinyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, and the like. Preferably, it is an epoxy group-containing silane coupling agent. These may be used alone or in combination of two or more.

Further, the composition for overcoat includes:
It contains a solvent if necessary. By dissolving the constituents of the other composition in the solvent, it is easy to control the hydrolysis reaction, and it is easy to control the viscosity and the film formation temperature at low temperature (less than the heat resistant temperature of the plastic substrate), This is because a smooth film can be obtained.

As the solvent, the above general formula R ¹ _mM (OR
² ) an organometallic compound (A) represented by _n and / or a hydrolytic condensate thereof, a polar group-containing polymer (B), and a functional group capable of reacting with the polar group-containing polymer (B) in the molecule It is only necessary to dissolve the silane coupling agent (C), and there is no particular limitation.

Specific examples of the solvent include methanol,
Ethanol, 2-propanol, butanol, pentanol, ethylene glycol, diethylene glycol, triethylene glycol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether,
Alcohols such as triethylene glycol monomethyl ether; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; aromatic hydrocarbons such as toluene, benzene and xylene; hydrocarbons such as hexane, heptane and octane; methyl acetate , Ethyl acetate, propyl acetate, acetates such as butyl acetate; other, ethyl phenol ether, propyl ether, tetrahydrofuran,
Water and the like. These may be used alone or as a mixture of two or more. Among them, alcohols such as methanol and ethanol are preferred because they are excellent in stability during hydrolysis reaction and storage stability.
In particular, in the present invention, it is desirable to appropriately select an appropriate solvent so that the cross-linking of the overcoat layer obtained therefrom becomes dense.

Further, a curing catalyst, a wettability improver, a plasticizer,
An appropriate amount of various inorganic or organic additives such as an antifoaming agent and a thickener can also be added.

The overcoating composition comprises the organometallic compound (A) and / or a hydrolytic condensate thereof,
It preferably contains at least two reactants of the polar group-containing polymer (B) and the silane coupling agent (C).

The compounding amount of the organometallic compound (A) and / or the hydrolytic condensate thereof depends on the compounding ratio of the polar group-containing polymer (B), the silane coupling agent (C), and other additives. Although it cannot be unambiguously defined because it differs depending on whether or not it is used, it is usually 20 to 90% by mass, and preferably 20 to 90% by mass, based on the total amount of the components of the overcoating composition (excluding the solvent). Is 3
It is in the range of 0 to 80% by mass, more preferably 50 to 70% by mass. When the amount of the organometallic compound (A) and / or its hydrolyzed condensate exceeds 90% by mass, the overcoat layer has flexibility, low-temperature film formability, transparency, smoothness, and scratch resistance. Properties, coating properties, adhesion to transparent electrodes (ITO), heat resistance, chemical resistance, and stain resistance. On the other hand, when the content is less than 20% by mass, the overcoat layer has water resistance, moisture resistance, low temperature film formability, transparency, smoothness, scratch resistance, coating properties, adhesion to a transparent electrode (ITO), Heat resistance, chemical resistance, and stain resistance may be poor.

The compounding amount of the polar group-containing polymer (B) depends on the compounding ratio of the organometallic compound (A) and / or its hydrolytic condensate, the silane coupling agent (C), and other additives. Although it cannot be unambiguously defined because it differs depending on whether or not it is used, it is usually 5 to 70% by mass, preferably 5% by mass, based on the total amount of the components of the overcoating composition (excluding the solvent). Is 5
-60 mass%, more preferably 5-40 mass%. When the amount of the polar group-containing polymer (B) is less than 5% by mass, the overcoat layer has flexibility, impact resistance, low-temperature film formability, transparency, smoothness, scratch resistance, and coating. Properties, adhesion to a transparent electrode (ITO), heat resistance, chemical resistance, and stain resistance may be poor. On the other hand, if it exceeds 70% by mass, the overcoat layer has water resistance, moisture resistance, low temperature film formability, transparency, smoothness, scratch resistance, coating properties, adhesion to a transparent electrode (ITO), Heat resistance, chemical resistance, and stain resistance may be poor.

The blending amount of the silane coupling agent (C) depends on the blending ratio of the organometallic compound (A) and / or its hydrolytic condensate, the polar group-containing polymer (B), and other additives. Although it cannot be unambiguously specified because it differs depending on whether or not it is used, it is usually 5 to 50% by mass, preferably 5 to 50% by mass, based on the total amount of the components of the overcoating composition (excluding the solvent). Is 7 ~
It is in the range of 35% by mass, more preferably 10 to 20% by mass. When the blending amount of the silane coupling agent (C) is less than 5% by mass, the overcoat layer may be inferior in low-temperature film-forming property and may cause cracks, and may have water resistance, moisture resistance, transparency, and smoothness. Properties, scratch resistance, coating properties, transparent electrodes (I
TO), heat resistance, chemical resistance, and stain resistance may be poor. On the other hand, when the content exceeds 50% by mass, the overcoat layer has flexibility, in addition to chemical resistance and scratch resistance.
Impact resistance, low-temperature film forming property, transparency, smoothness, coatability, adhesion to a transparent electrode (ITO), heat resistance, and stain resistance may be poor.

The amount of the solvent is not particularly limited, but the composition for the overcoat (here, the solvent is included)
Is usually 5 to 97% by mass, preferably 20 to 95% by mass, more preferably 5 to 97% by mass, when the total mass of
The range is from 0 to 90% by mass, particularly preferably from 70 to 90% by mass. If the amount of the solvent is less than 5% by mass, the reaction stability of the overcoat composition may be poor,
In addition, during coating, the viscosity of the overcoat composition may increase, making uniform coating impossible. On the other hand, if it exceeds 97% by mass, the productivity in forming the overcoat layer may be inferior, and the concentration of the active ingredient may be too low, so that the required thickness of the overcoat layer may not be secured. is there.

The above-mentioned organometallic compound (A) and / or
Or its hydrolysis condensate, polar group-containing polymer (B), silane coupling agent (C), and inorganic curing agents other than solvents, such as curing catalysts, wetting improvers, plasticizers, defoamers, and thickeners. Or the amount of various organic additives, the various properties of the additives can be sufficiently exhibited, and the organometallic compound (A) and / or its hydrolyzed condensate, the polar group-containing polymer (B ), The silane coupling agent (C) and the solvent are not particularly limited as long as the effects are not affected.

The organometallic compound (A) represented by the above general formula R ¹ _mM (OR ² ) _n and / or its hydrolyzed condensate, the polar group-containing polymer (B), and the polar group-containing polymer The total amount of the silane coupling agent (C) having a functional group capable of reacting with (B) in the molecule, and the overcoating composition including the solvent and other additives (excluding the solvent) may be any amount. It is always 100% by mass even in combination.

The color filter substrate of the present invention may be any one as long as it is coated with an overcoat layer obtained from the overcoat composition, and the other device configuration is not particularly limited. Conventionally known various color filter substrate devices can be used.

As an example, as shown in the liquid crystal display of FIG. 1, a black matrix layer 107, a colored layer 109 composed of three primary color pixels of RGB, an overcoat layer 111, Examples include those in which the transparent electrode layer 113 is formed.However, the present invention is not limited to these configurations, and examples thereof include a common electrode layer, a polarizing layer, an antireflection layer, an alignment film layer, and a retardation layer. If necessary, they may be appropriately selected and laminated or formed. These may be formed or laminated on the back side (or the opposite front side) of the plastic substrate on which the overcoat layer is formed. Hereinafter, a description will be given of an example of the device configuration of the color filter substrate shown in FIG.

Regarding a black matrix agent that can be used for forming the above-mentioned black matrix layer and a method for producing a black matrix layer using the same,
It is not particularly limited, and it is possible to appropriately use various known black matrix agent and black matrix layer production techniques, but preferably, as described in the prior art, on a plastic substrate. It is desirable to use a black matrix agent which is excellent in film-forming properties at low temperatures, especially at a temperature lower than the heat resistance temperature of the plastic substrate.

Further, the colorant for RGB three primary color pixels which can be used for forming the above-mentioned colored layer composed of RGB three primary color pixels and the method for producing the colored layer using the same should be particularly limited. Instead, it is possible to appropriately use a conventionally known technique for manufacturing a colorant for a three-primary-color pixel of RGB and a color layer manufacturing technique.
As described in the prior art, it is desirable to use a colorant for RGB three primary color pixels which is excellent in low-temperature film-forming properties on a plastic substrate, particularly at a temperature lower than the heat-resistant temperature of the plastic substrate. .

The transparent electrode agent that can be used for forming the transparent electrode layer and the method for producing the transparent electrode layer using the same are not particularly limited, and various conventionally known transparent electrode agents and transparent electrode agents can be used. The electrode layer manufacturing technique can be appropriately used. Also, the thickness of the transparent electrode layer may be the same as that of the transparent electrode layer applied to the existing color filter substrate, and is not particularly limited.

The use of the color filter substrate should not be limited to the use in a liquid crystal display described later, and an FED (self-luminous) which has been proposed as a new next-generation flat panel display replacing the liquid crystal display. It can be sufficiently used in new types of displays that do not use liquid crystal, such as flat panel displays of the direct current type, PDPs of the direct current type (plasma display panels), PDPs of the alternating current type, plasmatrons, and LED displays (light emitting diode displays).

Next, the liquid crystal display according to the present invention comprises:
What is necessary is just to have the above-mentioned color filter substrate,
The other components are not limited at all. For example, flat panels such as a color STN liquid crystal display, a color DSTN liquid crystal display, a color TFT liquid crystal display, a super TFT liquid crystal display, and an FLCD (ferroelectric liquid crystal display). The present invention can be suitably applied to various known color liquid crystal displays such as a liquid crystal display.

The device configuration of a typical liquid crystal display device is shown in the drawings, but these are only examples, and the present invention should not be limited to these.

FIG. 1 shows a general color T in which a liquid crystal panel, a backlight, a driving circuit and the like are housed in a thin package.
FIG. 1 is a schematic cross-sectional view schematically illustrating an embodiment of a device configuration of an FT liquid crystal display.

As shown in FIG. 1, the liquid crystal panel has a multilayer structure in which many thin plates having various functions are stacked. As shown in FIG. 1, a liquid crystal display includes a polarizing plate 101 and a color filter substrate 103 in order from the surface in a thin package formed of a case (not shown) and a bezel (metal frame; not shown). (The black matrix layer 107, R
A coloring layer 109 composed of three primary color pixels of GB, an overcoat layer 111, and a transparent electrode layer 113 are formed. ), LCD 115
(A spacer 116 is formed on the periphery.), TF
It has a multilayer structure in which a T substrate 117 (the TFT 121 and the pixel electrode 123 are formed on the surface of the TFT substrate 119), a polarizing plate 125, and a backlight 127. It has a structure provided with wiring (not shown) connecting the 129 and the drive circuit 131 and the like.

However, the liquid crystal display of the present invention is by no means limited to these. For example, a common electrode layer, a polarizing layer, an antireflection layer, an alignment layer, a retardation layer,
Dielectric layer, protective film layer, phosphor, insulating layer, resistor, partition, resist layer, cold cathode, gate, cathode, anode, anode bus line, display electrode, address electrode, aluminum evaporation layer, adhesive layer, etc. If necessary, they may be appropriately selected and laminated or formed. These may be formed or laminated on the back side or the front side of the color filter substrate 103 or the TFT substrate 117.

The method for producing the liquid crystal display of the present invention is not particularly limited, and various conventionally known display production techniques, in particular, a technique for producing a thin film on a plastic substrate, for example, a roll coating method , Dip coating method, bar coating method,
It can be manufactured by appropriately utilizing a coating technique such as a die coating method, a spin coating method or a method combining these methods, a wet film forming technique, and a physical vapor deposition method. In the case of forming a TFT or the like, it may be manufactured by appropriately utilizing a semiconductor manufacturing technique or the like.

It is needless to explain in detail the components of each display, many of which have already been put into practical use for each display, and new ones are being proposed every day. A display of a desired system can be formed by appropriately using an optimum one among these displays. In addition, various methods that have already been established for each manufacturing method have been put to practical use, and new manufacturing methods have been proposed every day, and a display of a desired method is manufactured by appropriately using these methods. It goes without saying that it can be done.

[0065]

The present invention will be specifically described below with reference to examples. In addition, the measuring method of the characteristic test in an Example and its evaluation criteria are as follows.

[Scratch resistance] The formed overcoat film was rubbed with # 000 steel wool, and the state of damage was observed.

[Copper pattern test] The formed overcoat film was subjected to peeling with a scotch tape (registered trademark), and those without peeling were evaluated as ○, and those with peeling were evaluated as x.

[Chemical Resistance] The formed overcoat film was immersed in γ-butyrolactone at 20 ° C. for 5 minutes.
も の indicates no change in the film, and X indicates change in peeling or cloudiness.

Example 1 Epomin SP-018 (Polyethyleneimine: trade name of Nippon Shokubai Co., Ltd.) {Polar group-containing polymer (B)} 25
g, γ-glycidoxypropyltrimethoxysilane ｛silane coupling agent (C)｝ 50 g, ethanol ｛solvent｝ 500 g, and reacted at 70 ° C. for 3 hours. After cooling to room temperature, water ｛solvent｝ 6 g and ethanol ｛solvent｝ 2
0 g of the mixed solution was added and reacted for 24 hours. Further, 30 g of M silicate 51 (tetramethoxysilane oligomer:
Tama Chemical Co., Ltd.) (hydrolytic condensate of organometallic compound (A)) was added to obtain overcoating composition (1).

An RGB image obtained by dispersing a pigment on a 100 μm-thick polycarbonate film (plastic substrate) using a black matrix and an imide resin as a dispersing binder (a black matrix layer and a colored layer comprising three primary color pixels of RGB) ) Was formed, and then the composition (1) for overcoat was applied and heated at 120 ° C for 1 hour to form an overcoat layer having a coat thickness of 2 µm.
At this time, a characteristic test of the obtained overcoat layer (coating) was performed. Table 1 shows the obtained results. Separately from these test samples, a transparent electrode (ITO) was further formed on the one formed up to the overcoat layer to obtain a color filter substrate. Adhesion with the transparent electrode (ITO) was good.

Example 2 Using the color filter substrate obtained in Example 1, a color TFT liquid crystal display device shown in FIG. 1 was obtained. The image was good.

Comparative Example 1 The same operation as in Example 1 was carried out except that the M silicate 51 was not added, to form an overcoat layer. Table 1 shows the property test results of the obtained overcoat layer (coating).

[0073]

[Table 1]

[0074]

As described above, according to the present invention, (1)
Heat resistance Applied to plastic substrates with low heat resistance (about one hundred and several tens of degrees Celsius) compared to glass substrates with 200 ° C or higher, and at low temperatures (specifically, temperatures lower than the heat resistance temperature of plastic substrates) The present invention can provide a color filter substrate obtained by coating the plastic substrate with a novel overcoat layer which can be formed in a short time, has a short production time, and is excellent in productivity, and a liquid crystal display device having the same. is there.

Further, according to the present invention, (2) in addition to the effect of the above (1), furthermore, the obtained coating film is excellent in smoothness, adhesion to a transparent electrode (ITO) and scratch resistance, and is excellent in the overcoat layer. An object of the present invention is to provide a color filter substrate formed by coating a plastic substrate with a novel overcoat layer capable of satisfying the required high performance and a liquid crystal display device having the same.

Further, according to the present invention, (3) the above (1)
In addition to the effect of (2), a new overcoat layer that can meet the high performance required for the overcoat layer such as coatability, transparency, heat resistance, chemical resistance, stain resistance, etc. An object of the present invention is to provide a color filter substrate coated on a base material and a liquid crystal display device having the same.

Therefore, as compared with various displays using a conventional glass substrate, it can be made very light and thin, strong against impact and hard to break, and can be formed into an arbitrary shape, for example, a curved surface. Because a plastic base material that has excellent moldability and high transparency can be applied, it is possible to further reduce the size and weight, so that it is excellent in portability and power consumption. ,
Mobile devices and mobile devices (eg mobile phones, PHS,
Personal digital assistants (PDAs, etc.), portable notebook computers, pagers, car phones, portable game consoles, car navigation systems,
It can be very suitably used for applications such as portable small liquid crystal televisions and portable DVDs.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view schematically showing a device configuration of a general color TFT liquid crystal display in which a liquid crystal panel, a backlight, a driving circuit, and the like are housed in a thin package as one embodiment of the liquid crystal display device according to the present invention. FIG.

[Explanation of symbols]

101: polarizing plate, 103: color filter substrate, 105: plastic substrate, 107: black matrix layer, 109: colored layer consisting of three primary color pixels of RGB, 111: overcoat layer, 113 ...
Transparent electrode layer, 115 ... liquid crystal, 116 ...
Spacer, 117 ... TFT substrate, 119 ... T
FT base material, 121 TFT, 123 pixel electrode, 125 polarizing plate, 127 backlight, 129 fluorescent tube, 131 drive circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H048 BB02 BB15 BB37 BB44 2H090 JB03 JC07 LA15 2H091 FA02X FA02Z FB01 FB11 FD06 GA01 4J038 CE022 CE032 CG032 CG142 CG172 CH122 CH192 CR072 DL031 DM021 GA03 GA06 GA08

Claims (2)

[Claims] 1. A plastic substrate having the following general formula (1): (Wherein, M is a metal element, R ¹ may be the same or different, represents a hydrogen atom, an alkyl group, or an alkyl group having a functional group, and R ² may be the same or different, Represents a hydrogen atom, an alkyl group, or an acyl group, n is an integer of 1 or more, n is an integer of 1 or more, and m + n is the same as the valence of the metal element M.) An organometallic compound (A) and / or a hydrolytic condensate thereof; a polar group-containing polymer (B); and a silane coupling agent (C) having a functional group capable of reacting with the polar group-containing polymer (B) in the molecule. A) a color filter substrate, which is coated with an overcoat layer obtained from an overcoat composition containing the same. 2. A liquid crystal display device comprising the color filter substrate according to claim 1.