JP2002286922A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device having a color filter substrate comprising a plastics substrate coated with a novel overcoat layer which is film formed at a low temperature and in a short time and which is excellent in smoothness, adhesion property to a transparent substrate (ITO (indium tin oxide)) and scratch resistance of the obtained coating film. SOLUTION: The liquid crystal display device is provided with the color filter substrate, coated with the overcoat layer, which is obtained by film forming a composition for overcoating obtained from an organometallic compound (A), expressed by a general formula (1), R<1> m Si(OR<2> )n (provided that in the folmula R<1> expresses a hydrogen atom, an alkyl group or an alkyl group with a functional group, optionally identical or different respectively, R<2> expresses 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=4), and/or its hydrolyzed and condensed product, a silane coupling agent (B) and an organic compound (C) having a functional group capable of reacting with the silane coupling agent (B) within the molecule on the plastics substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel liquid crystal display (hereinafter, also referred to as a liquid crystal display) and a color filter substrate used for 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 scratch resistance, stain resistance, solvent resistance, surface smoothness, and a transparent electrode. Liquid crystal display device having an overcoat layer having excellent adhesion to a liquid crystal display device and a color filter substrate used in the liquid crystal display device.

[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 increased.

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 like a liquid crystal display. In that a color filter substrate coated with an overcoat layer excellent in film forming properties is required,
It is no different from a liquid crystal display.

[0008]

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

Another object of the present invention is to provide a liquid crystal having a color filter substrate obtained by coating a plastic substrate 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. A display device and the color filter substrate are provided.

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

More specifically, a film can be formed in a short time at a low temperature (a temperature lower than the heat resistance temperature of the plastic substrate), the production time is short, the productivity is excellent, the smoothness of the obtained film, the transparency of 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 liquid crystal display device having a color filter substrate coated with a material, and the color filter substrate.

[0012]

These objects are achieved by the following (1) to (5).

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

[0014]

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(Wherein, 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; A group or an acyl group; n
Is an integer of 1 or more, and m + n = 4. A) a color filter substrate coated with an overcoat layer obtained from an overcoat composition containing an organometallic compound (A) and / or a hydrolytic condensate thereof and a silane coupling agent (B). Liquid crystal display device having.

(2) An organometallic compound (A) represented by the general formula (1) and / or a hydrolytic condensate thereof and a silane coupling agent (B) are formed on a plastic substrate.
And an organic compound (C) having a functional group capable of reacting with the silane coupling agent (B) in the molecule, and a color coated with an overcoat layer obtained by forming an overcoat composition obtained from the composition. A liquid crystal display device having a filter substrate.

(3) The silane coupling agent (B)
Is a liquid crystal display device according to the above (1) or (2), which contains an amino group.

(4) An organometallic compound (A) represented by the general formula (1) and / or a hydrolytic condensate thereof and a silane coupling agent (B) are formed on a plastic substrate.
And a color filter substrate coated with an overcoat layer obtained from an overcoat composition containing the same.

(5) An organometallic compound (A) represented by the above general formula (1) and / or a hydrolytic condensate thereof and a silane coupling agent (B) are formed on a plastic substrate.
And an organic compound (C) having a functional group capable of reacting with the silane coupling agent (B) in the molecule, and a color coated with an overcoat layer obtained by forming a film for an overcoat obtained from the composition. Filter substrate.

[0020]

The liquid crystal display device of the present invention aspects of the embodiments of the Invention, the plastic substrate, the general formula _{^{(1); R 1 m Si}} (OR 2) n ( where in the formula, also R ¹ is the same or different A hydrogen atom, an alkyl group, or an alkyl group having a functional group; R ² may be the same or different;
Represents an alkyl group or an acyl group, n is an integer of 1 or more, and m + n = 4. A) a color filter substrate coated with an overcoat layer obtained from an overcoat composition containing the organometallic compound (A) and / or a hydrolyzed condensate thereof and a silane coupling agent (B) (A color filter substrate coated with an overcoat layer obtained by forming a film for the overcoat composition obtained from the above-mentioned raw material components). Preferably, the composition for overcoat further comprises a silane coupling agent (B)
Organic compound (C) having in its molecule a functional group capable of reacting with
And more preferably the silane coupling agent (B) contains an amino group.

As a result, heat resistance, chemical resistance and scratch resistance due to a three-dimensional crosslinked structure by hydrolysis and condensation of the organometallic compound (A), uniformity of the coating with the silane coupling agent (B), chemical resistance, Due to abrasion resistance, smoothness, flexibility by organic compound (C), adhesion to transparent electrode, and low-temperature film-forming property, at low temperature (temperature lower than the heat-resistant temperature of plastic substrate), in a short time Films can be formed, it is excellent in productivity, the resulting film has excellent smoothness, adhesion to transparent electrodes (ITO), excellent scratch resistance, etc., and also has good coating properties, transparency, heat resistance, and chemical resistance. The present invention can provide a liquid crystal display device having a color filter substrate obtained by coating a plastic substrate with a novel overcoat layer capable of satisfying high performance required for an overcoat layer such as water resistance and stain resistance.

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

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.

If a plastic substrate is specifically illustrated,
Polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene-2,6-naphthalate, polybutylene terephthalate and copolymers thereof, polyamides, polystyrene, poly (meth) acrylic acid Polyarylates such as esters, polyacrylonitrile, polyvinyl acetate, polycarbonate,
Cellophane, polyimide, polyetherimide, polysulfone, polyethersulfone, polyetherketone, ionomer resin, thermoplastic resin such as fluororesin, melamine resin, polyurethane resin, epoxy resin,
Examples include thermosetting resins such as phenolic resins, unsaturated polyester resins, urea resins, alkyd resins, and silicon resins. Preferably, heat resistance, mechanical strength, transparency,
From the viewpoints of moldability and antireflection properties, polycarbonate and polyarylate are used. 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.

Next, on the plastic substrate, an organometallic compound (A) represented by the above general formula R ¹ _m Si (OR ² ) _n and / or a hydrolytic condensate thereof, and silane coupling An overcoat layer obtained from an overcoating composition containing an agent (B) and an organic compound (C) having a functional group capable of reacting with the silane coupling agent (B) in the molecule. .

Here, the overcoating composition is
It is sufficient that the organic metal compound (A) and / or its hydrolytic condensate and the silane coupling agent (B) are contained as main raw materials, and the organic compound (C) is further used as a main raw material. Are preferred.

The overcoating composition comprises the organometallic compound (A) and / or a hydrolyzed condensate thereof,
Further, it preferably contains a reactant of the silane coupling agent (B).

The composition for overcoat comprises at least two of the above-mentioned organometallic compound (A) and / or a hydrolyzed condensate thereof, a silane coupling agent (B), and the above-mentioned organic compound (C). It is preferable to include the reactant of

Further, various inorganic and organic additives such as a curing catalyst, a wettability improver, a plasticizer, an antifoaming agent and a thickener are added to the overcoating composition within a range not to impair the effects of the present invention. May be included as a raw material. In addition, when an appropriate solvent that dissolves these is used, these solvents are also included unless otherwise limited.

The overcoat composition is specified by the raw materials used in accordance with the method and process of manufacturing the overcoat layer, which will be described later. 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 silane coupling agent (B) and further a functional group capable of reacting with the silane coupling agent (B). Is used in combination with an organic compound (C) having in the molecule a compound having excellent properties such as low-temperature film-forming properties, surface smoothness, adhesion to a transparent electrode, and scratch resistance. .

In the general formula (1), n is an integer of 1 or more, m is an integer of 0 or more, and m + n = 4. From the viewpoint of the heat resistance of the overcoat layer, it is preferable that m = 0 and n = 4.

General formula (1) as described above; R ¹ _m Si
(OR ² ) Specific examples of the organometallic compound (A) represented by _n include tetramethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, n-propyltrimethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane, Tetraethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, n-propyltriethoxysilane, dimethyldiethoxysilane, tetraisopropoxysilane, tetra-n-butoxysilane, tetraisopropoxysilane, tetrabutoxysilane, methyltriisopropoxy Silane, methyltributoxysilane, ethyltriisopropoxysilane, ethyltributoxysilane, dimethyldiisopropoxysilane, dimethyldibutoxysilane, diethyldimethoxysilane, diethyldie Kishishiran, diethyl diisopropoxy silane, diethyl dibutoxy silane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl triisopropoxysilane, vinyl tributoxysilane silane,
γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, alkoxysilanes such as γ-methacryloxypropyltriethoxysilane, tetrahydroxysilane, trimethylsilanol, tetraacetoxysilane, Examples include methyltriacetoxysilane. From the viewpoint of easy film formation, preferred are tetramethoxysilane and tetraethoxysilane. These may be used alone or in combination of two or more.

The reason that the overcoat composition may contain the hydrolysis-condensation product of the organometallic compound (A) is that the overcoat composition may be prepared in advance from the viewpoint of film forming properties at low temperatures and film uniformity. 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 silane coupling agent (B), which is one of the main raw materials of the overcoat composition, is not particularly limited.
It is selected from an amino group, an epoxy group, a (meth) acrylic group, an isocyanate group, and a mercapto group because it has excellent effects of imparting uniformity and smoothness, chemical resistance, crack resistance, and pinhole resistance of the obtained film. Those having at least one kind of functional group in the molecule are preferred. In particular,
From the viewpoint of adhesion to a transparent electrode and low-temperature film-forming properties, those having an epoxy group and an amino group in the molecule are preferable, and those having an amino group in the molecule are particularly preferable. The silane coupling agent (B) used in the present invention is preferably preliminarily co-hydrolyzed and condensed with the organometallic compound (A) in view of the chemical resistance of the resulting film.

Specific examples of the silane coupling agent (B) 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. These may be used alone or in combination of two or more.

Next, the organic compound (C), which is another one of the main raw materials of the overcoat composition, is as follows:
There is no particular limitation as long as it has a functional group capable of reacting with the silane coupling agent (B) in the molecule. The above organic compound (C) is added to the overcoat composition.
Is advantageous in that it has the effects of improving low-temperature film-forming properties, crack resistance, and adhesion to plastic substrates, transparent electrodes, and the like.

The organic compound (C) is used in combination with the silane coupling agent (B) because of its solvent resistance and scratch resistance.
It is preferable to have two or more functional groups in the molecule that react with the compound, and it is desirable to have an aromatic ring in the molecule from the viewpoint of water resistance.

Here, the silane coupling agent (B)
The functional group capable of reacting with is not particularly limited, and varies depending on the type of the silane coupling agent (B). For example, an epoxy group, an isocyanate group, a thioisocyanate group, a carboxyl group, Examples include an oxazolinyl group, a hydroxyl group, an amino group, a (meth) acryl group, an aldehyde group, a ketone group, and an alkyl halide group, but are not limited thereto, and preferably an epoxy group. Therefore, the organic compound (C) is not particularly limited as long as it is a compound having a functional group in the molecule that reacts with the silane coupling agent (B), but is preferably a glycidyl compound.

As the organic compound (C), for example,
Monoglycidyl ethers such as phenyl glycidyl ether and butyl glycidyl ether, ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, triethylene glycol diglycidyl ether, tetraethylene glycol diglycidyl ether, nonaethylene glycol diglycidyl ether, propylene glycol diglycidyl Aliphatic diglycidyl ethers such as ether, dipropylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, glycerol diglycidyl ether, trimethylolpropane diglycidyl ether, and glycerol triglycidyl ether , Diglycerol triglycidyl ether, triglyci Rutorisu (2-hydroxyethyl)
Polyglycidyl ethers such as isocyanurate, trimethylolpropane triglycidyl ether, pentaerythritol triglycidyl ether, glycidyl esters such as diglycidyl adipate and diglycidyl o-phthalate, bisphenol A diglycidyl ether, resorcinol diglycidyl ether,
Hydroquinone diglycidyl ether, bisphenol S
Diglycidyl ether, bisphenol F diglycidyl ether, and compounds represented by the following formula;

[0044]

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Glycidyls having an aromatic ring or a hydrogenated ring thereof (including a nuclear-substituted derivative); or oligomers having a glycidyl group as a functional group (for example, in the case of a bisphenol A diglycidyl ether oligomer, Can be expressed);

[0046]

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And the like. Epoxy group-containing compounds such as

Of these epoxy group-containing compounds, compounds having an aromatic or a hydrogenated ring thereof in the molecule are preferred.

The organic compound (C) further includes
Hexamethylene diisocyanate, tolylene diisocyanate, 1,4-diphenylmethane diisocyanate,
1,5-naphthalenediisocyanate, triphenylmethane triisocyanate, tolidine diisocyanate,
Diisocyanates such as xylylene diisocyanate and dicyclohexylmethane diisocyanate; or
Carboxylic acids such as tartaric acid and adipic acid, and carboxyl group-containing polymers such as polyacrylic acid; oxazolinyl group-containing polymers; or hydroxyl group-containing compounds such as 1,6-hexanediol and polyvinyl alcohol; or
Examples include amino group-containing compounds such as hexamethylene diamine; and (meth) acrylates such as methyl (meth) acrylate and ethylene glycol di (meth) acrylate. These can be appropriately selected according to the type of the silane coupling agent (B) to be used. Of course, these organic compounds (C) described above
May be used alone or in combination of two or more.

In the present invention, the organic compound (C)
Is a preferred embodiment to use before reacting with the silane coupling agent (B) because the organic compound (C) is efficiently distributed in the film. When a (meth) acrylic group-containing silane coupling agent is selected as the silane coupling agent (B) and a (meth) acrylic group-containing monomer or oligomer is selected as the organic compound (C), polymerization is performed in advance by a known method. It is preferable to use it from the viewpoint of reactivity, but it is also possible to polymerize with an energy ray such as ultraviolet ray at the time of film formation.

In addition, 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.

Examples of the solvent include the above-mentioned organometallic compound (A) and / or its hydrolytic condensate, the above-mentioned silane coupling agent (B), and the above-mentioned organic compound (C).
Is not particularly limited as long as it can dissolve the compound.

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 amount of the organometallic compound (A) and / or its hydrolytic condensate is determined by the mixing ratio of the silane coupling agent (B), the organic compound (C), and the use of other additives. Although it cannot be unambiguously defined because it differs depending on the presence or absence of the solvent, it is usually 10 to 70% by mass, preferably 10 to 70% by mass, based on the total compounding amount of the components (excluding the solvent) of the overcoating composition. 20 ~
It is in the range of 60% by mass, more preferably 30 to 50% by mass. When the amount of the organometallic compound (A) and / or its hydrolyzed condensate exceeds 70% by mass,
The overcoat layer is flexible, low-temperature film-forming, transparent,
It may be poor in smoothness, scratch resistance, coatability, adhesion to a transparent electrode (ITO), heat resistance, chemical resistance, and stain resistance.
On the other hand, when it is less than 10% 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-resistant,
Poor chemical and stain resistance.

The compounding amount of the silane coupling agent (B) depends on the compounding ratio of the organometallic compound (A) and / or its hydrolytic condensate, the compounding ratio of the organic compound (C) and the use of other additives. Although it cannot be unambiguously defined because it differs depending on the presence or absence of the compound, the amount is usually 20 to 80% by mass, and preferably 20 to 80% by mass, based on the total amount of the components of the overcoating composition (excluding the solvent). 30 ~
It is in the range of 70% by mass, more preferably 40 to 60% by mass. When the blending amount of the silane coupling agent (B) is 20
If it is less than mass%, the flexibility of the overcoat layer,
Impact 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. On the other hand, if it exceeds 80% 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 organic compound (C) depends on the compounding ratio of the organic metal compound (A) and / or its hydrolytic condensate, the silane coupling agent (B), and whether or not other additives are used. Although it cannot be unambiguously defined because it differs depending on the like, it is usually 1 to 50% by mass, preferably 3 to 5% by mass, based on the total amount of the components (excluding the solvent) of the overcoating composition. The range is 30% by mass, more preferably 5 to 15% by mass. When the amount of the organic compound (C) is less than 1% by mass,
In addition to the low-temperature film formability of the overcoat layer, cracks may occur, and water resistance, moisture resistance, transparency, smoothness,
The abrasion resistance, coatability, adhesion to a transparent electrode (ITO), heat resistance, chemical resistance, and stain resistance may be poor. 5
When the content exceeds 0% by mass, in addition to the chemical resistance and abrasion resistance of the overcoat layer, flexibility, impact resistance, low-temperature film forming property, transparency, smoothness, coating property, transparent electrode (ITO) ), Heat resistance, and stain resistance may be poor.

The amount of the solvent is not particularly limited, but the overcoating composition (here, the solvent is included)
Is usually 50 to 98 when the total mass of
%, Preferably 70 to 97% by mass, more preferably 80 to 95% by mass. When the amount of the solvent is less than 50% by mass, the reaction stability of the overcoat composition may be inferior, and the viscosity of the overcoat composition may increase during coating, resulting in uniform coating. May not be possible. On the other hand, if it exceeds 98% by mass, the productivity in forming the overcoat layer may be poor, 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 an inorganic or organic material such as a hydrolysis condensate thereof, a silane coupling agent (B), an organic compound (C), and a curing catalyst other than a solvent, a wettability improver, a plasticizer, an antifoaming agent, and a thickener. With respect to the amounts of the various additives in the system, the various properties of the additives can be sufficiently exhibited, and the organometallic compound (A) and / or its hydrolytic condensate, the silane coupling agent (B), The organic compound (C) and the solvent are not particularly limited as long as the effects are not affected.

The above organometallic compound (A) and / or
Alternatively, the total blending amount of the overcoating composition (excluding the solvent) containing the hydrolyzed condensate, the silane coupling agent (B), the organic compound (C), the solvent and other additives may be any combination. However, it is always 100% by mass.

The thickness of the overcoat layer obtained from the overcoat composition cannot be uniquely defined because it varies depending on the intended use. (Lower temperature than the heat-resistant temperature of the material), can form a film in a short time, and is excellent in productivity, and further, excellent in transparency, smoothness, scratch resistance, etc. of the obtained film, and more excellent. Coatability,
Any material that can exhibit adhesiveness to a transparent electrode (ITO), heat resistance, chemical resistance, and the like may be used.
-5 μm, preferably 0.5-3 μm, more preferably 1-2 μm. When the thickness of the overcoat layer is less than 0.1 μm, the film may not be uniform, and the pinhole resistance and the chemical resistance may not be sufficient. Adhesion with a substrate or a transparent electrode, transparency of film formation, smoothness, abrasion resistance, coating property and heat resistance are hardly sufficiently exhibited. On the other hand, when the thickness of the overcoat layer exceeds 5 μm, cracks are easily generated in the coating.

A color filter substrate coated with an overcoat layer obtained from the overcoat composition (ie, a color filter substrate coated with an overcoat layer obtained by forming the overcoat composition). Is the same type (composition) for the plastic substrate
May be applied several times separately, or by applying different types (compositions) of different overcoat compositions separately to each other to obtain a multilayer having a different composition and thickness for each layer. May be formed.

Next, the color filter substrate of the present invention may be any as long as it covers the overcoat layer obtained from the overcoat composition, and other constituent elements are particularly limited. Instead, it is possible to adopt a configuration of conventionally known various color filter substrates.

For 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. In addition, the lamination order, the lamination thickness, and the like may be appropriately determined depending on the intended use. Further, a coating layer having excellent chemical resistance, heat sealing properties and safety may be provided as a top coat layer. 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 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.

The colorants for RGB three primary color pixels which can be used for forming the above-described colored layers composed of RGB three primary color pixels, and the method of manufacturing 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. The electrode layer manufacturing technique can be appropriately used.

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 a thin package formed of a case (not shown) and a bezel (metal frame; not shown) in order from the surface. (A black matrix layer 107, a colored layer 109 including three primary color pixels of RGB, an overcoat layer 111, and a transparent electrode layer 113 are sequentially formed on the back surface of the plastic base material 105).
The liquid crystal 115 (a spacer 116 is formed on the periphery), the TFT substrate 117 (the surface of the TFT
FT 121 and pixel electrode 123 are formed), polarizing plate 12
5. It has a multilayer structure in which the backlight 127 is laminated, and has a structure in which wiring (not shown) for connecting the fluorescent tube 129 and the driving circuit 131 is provided on the side surface.

However, the liquid crystal display of the present invention should not be limited to these, and may be, for example, a common electrode layer, a polarizing layer, an antireflection layer, an alignment film 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.

It is to be noted that each component of each display need not be described in detail, many of which have already been put into practical use for each display, and new ones have been 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.

[0072]

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 layer (overcoat film) was rubbed with # 000 steel wool, and the scratched state was observed. Is indicated by x.

[Copper Test] The formed overcoat film was subjected to peeling with a scotch tape (registered trademark), and samples without peeling were evaluated as 剥離, and samples with peeling were evaluated as x.

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

Example 1 γ-aminopropyltrimethoxysilane メ ト キ シ silane coupling agent (B)｝ 20 g, γ-glycidoxypropyltrimethoxysilane ｛organic compound (C)｝ 10 g and ethanol ｛solvent｝ 400 g were mixed. Then, the reaction was carried out at 70 ° C. for 3 hours. After cooling to room temperature, 6 g of water and 20
g of the mixture, and reacted for 24 hours.
Silicate 51 (tetramethoxysilane oligomer, trade name of Tama Chemical Co., Ltd.) {hydrolysis condensate of organometallic compound (A)} was added to obtain overcoat 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 composed of 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 point, a characteristic test of the obtained overcoat layer (overcoat film) was performed. Table 1 shows the obtained results. Separately from these test samples, a transparent electrode (ITO) was added to the above-mentioned one formed up to the overcoat layer.
Was formed to obtain a color filter substrate. Transparent electrode (I
TO) 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 was performed as in Example 1 except that M silicate 51 (tetramethoxysilane oligomer, trade name of Tama Chemical Co., Ltd.) {hydrolysis condensate of organometallic compound (A)} was not added. And an overcoat layer. Table 1 shows the characteristic test results of the obtained overcoat layer (overcoat film).

[0080]

[Table 1]

[0081]

As described above, according to the present invention, (1)
Heat resistance Heat resistance (approximately one hundred and several degrees Celsius) is lower than that of a glass substrate with a temperature of 200 ° C or higher, and is applied at a low temperature (specifically, a temperature lower than the heat resistance temperature of the plastic substrate). The present invention provides a liquid crystal display device having a color filter substrate formed by coating a novel overcoat layer having a short production time and excellent productivity on the plastic substrate, and a color filter substrate. You can do it.

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

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 liquid crystal display device having a color filter substrate formed by coating a substrate and the color filter substrate.

Therefore, compared to various displays using a conventional glass substrate, it can be made very light and thin, resistant to impact and hard to break, and can be formed into any 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, portable DVD-ROMs, portable video players, and the like.

[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.

Claims (5)

[Claims] 1. A plastic base material having the following general formula (1): (However, in the formula, R ¹ may be the same or different and represents a hydrogen atom, an alkyl group, or an alkyl group having a functional group, and R ² may be the same or different and a hydrogen atom, an alkyl group, or An acyl group, n is an integer of 1 or more, and m + n = 4), a silane coupling agent (B), and a silane coupling agent (B) A liquid crystal display device having a color filter substrate coated with an overcoat layer obtained from an overcoat composition containing: 2. A plastic substrate having the following general formula (1): (However, in the formula, R ¹ may be the same or different and represents a hydrogen atom, an alkyl group, or an alkyl group having a functional group, and R ² may be the same or different and a hydrogen atom, an alkyl group, or An acyl group, n is an integer of 1 or more, and m + n = 4), a silane coupling agent (B), and a silane coupling agent (B) A color filter substrate coated with an overcoat layer obtained by forming a film for an overcoat composition obtained from the organic compound (C) having a functional group capable of reacting with the silane coupling agent (B) in the molecule. A liquid crystal display device having: 3. The liquid crystal display device according to claim 1, wherein the silane coupling agent (B) contains an amino group. 4. A plastic substrate having the following general formula (1): (However, in the formula, R ¹ may be the same or different and represents a hydrogen atom, an alkyl group, or an alkyl group having a functional group, and R ² may be the same or different and a hydrogen atom, an alkyl group, or An acyl group, n is an integer of 1 or more, and m + n = 4), a silane coupling agent (B), and a silane coupling agent (B) A color filter substrate coated with an overcoat layer obtained from an overcoat composition containing: 5. A plastic substrate having the following general formula (1): (Wherein, R ¹ may be the same or different and represents a hydrogen atom, an alkyl group, or an alkyl group having a functional group, and R ² may be the same or different and a hydrogen atom, an alkyl group, or An acyl group, n is an integer of 1 or more, and m + n = 4), a silane coupling agent (B), and a silane coupling agent (B) A color filter substrate coated with an overcoat layer obtained by forming a film for an overcoat composition obtained from the organic compound (C) having a functional group capable of reacting with the silane coupling agent (B) in the molecule; .