JPH0734075B2 - Liquid crystal display panel substrate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a substrate for a liquid crystal display panel in which a polarizing film is provided on a base material layer made of a non-optical rotatory transparent film or sheet.

2. Description of the Related Art Conventionally, as a liquid crystal display panel, a glass plate is used as a base material and a polarizing plate is laminated on the glass plate via an adhesive.

Also, using a plastic film or sheet as a base material,
It is also known that a polarizing plate is laminated on this with an adhesive.

Further, JP-A-57-20718 according to the inventors of the present invention discloses that the heat distortion temperature is 80 ° C. on at least one surface of the polarizing film.
It is made of the above synthetic resin materials and has a retardation value
There is disclosed a polarizing plate in which a transparent film or sheet having a thickness of 30 nm or less is formed, and a transparent conductive film is formed on at least one of the film and the sheet on the surface opposite to the polarizing element film. For the adhesive lamination of the transparent film or sheet and the polarizing film, an organic solvent solution type adhesive such as urethane adhesive, acrylic adhesive, cyanoacrylic adhesive, olefin adhesive, epoxy adhesive is used. I am going.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, a liquid crystal display panel having a layer structure of glass plate / adhesive layer / polarizing plate is inferior in mechanical strength, cannot cope with thinning, and is inferior in productivity. There is.

A liquid crystal display panel having a layer structure composed of a plastic film or a sheet / adhesive layer / polarizing plate is intended to solve the above-mentioned problems of the liquid crystal display panel using a glass plate. Since it is performed with an adhesive, heat may generate bubbles or delamination.

The polarizing plate disclosed in JP-A-57-20718, that is, the polarizing plate comprising a polarizing film / transparent film having a retardation value of 30 nm or less or a sheet / transparent conductive film is used in the above two types of liquid crystal display panels. Although the performance is greatly improved, the adhesive used for laminating the transparent film or sheet and the polarizing element film may cause the transparent film or sheet to be whitened or have fine irregularities. In some cases, the intended purpose could not be sufficiently achieved due to scattering and deterioration of transparency.

The present invention intends to solve such a problem by devising an adhesive layer used for laminating a transparent film or sheet and a polarizing element film.

Means for Solving the Problems In the liquid crystal display substrate of the present invention, an organic solvent-based adhesive layer (2) formed by using an adhesive dissolved or dispersed in an organic solvent on at least one surface of a polarizing film (1). ) Is provided, and an aqueous anchor coat layer (3) formed by using an anchor agent dissolved or dispersed in an aqueous medium is provided thereon, and a polycarbonate resin, a polyether sulfone resin, a polysulfone resin is further provided thereon. , A non-optical-rotation transparent film or sheet having a retardation value of 30 nm or less, which is formed of a polyarylene ester resin or a cellulose resin, and has a laminated structure in which a base layer (4) is provided.

The present invention will be described in detail below.

Polarizing Element Film (1) As the polarizing element film (1), various element films having a polarization ability are used. As a typical example of the polarizing film (1), the following 2
There are two groups.

Polyvinyl alcohol / iodine type, olefin-vinyl alcohol copolymer / iodine type, etc., polyvinyl alcohol / dichroic dye type, olefin-vinyl alcohol copolymer / dichroic dye type, olefin-vinyl alcohol copolymer / polyene , Polyvinyl alcohol / polyene system, polyvinyl halide / polyene system, polyacrylonitrile / polyene system, polyacrylate / polyene system, polymethacrylate / polyene system, etc. It can be said that the group having excellent sex is more preferable.

Base material layer (4) As the base material layer (4), a retardation value (R value) 30 nm formed from a polycarbonate resin, a polyether sulfone resin, a polysulfone resin, a polyarylene ester resin or an erulose resin. The following non-optical rotatory transparent films or sheets are used.

Film or sheet molded from a resin other than these resins, considering the application of the substrate for liquid crystal display panel,
I'm not satisfied.

Here, the retardation value (R value) is a value represented by the product of the film thickness d and the absolute value of the difference between the two refractive indexes in the direction perpendicular to the film, as in the following equation. is there.

R = d · | n ₁ −n ₂ | (where n ₁ is the refractive index in any direction and n ₂ is the refractive index orthogonal to the n ₁ direction) If this R value exceeds 30 nm, the proper viewing angle as a panel is As the width becomes narrower, interference fringes are generated and the legibility of the liquid crystal display device deteriorates.

The resin that should be the material of the film or sheet that satisfies these conditions is amorphous, and if it has crystallinity, it partially crystallizes, resulting in poor transparency and optical anisotropy. Encounters the problem of high R value.

Organic solvent-based adhesive layer (2) The organic solvent-based adhesive layer (2) refers to a layer formed by using an adhesive dissolved or dispersed in an organic solvent.

Such adhesives include urethane-based, acrylic-based,
Examples include cyanoacrylic adhesives, olefin adhesives, epoxy adhesives, and silicone adhesives.

Examples of the organic solvent include esters, ketones, ethers, hydrocarbons, cellosolves, alcohols, halogen-containing organic solvents, nitrogen-containing organic solvents and the like.

The layer thickness of the organic solvent adhesive layer (2) is 5 to 20 on a dry basis.
It is preferable to set to μm.

Aqueous anchor coat layer (3) The aqueous anchor coat layer (3) is a layer formed by using an anchor agent dissolved or dispersed in an aqueous medium.

As the anchor agent, various water-soluble resins (water-soluble polyester resin, water-soluble polyamide resin, water-soluble polyurethane resin, etc.) and water-dispersible resins (ethylene-vinyl acetate emulsion, (meth) acrylic emulsion, etc.) are used. Among them, it is particularly preferable to use a polyester resin, a polyamide resin, a polyurethane resin or an ionic polymer complex having a hydrophilic group.

Examples of the hydrophilic group include at least one hydrophilic group selected from the group consisting of a metal sulfonate group, a carboxyl group, an alkyl group-substituted tertiary nitrogen and an alkylene group-substituted tertiary nitrogen.

The resin having a hydrophilic group is used for coating in a state of being dissolved or dispersed in fine particles in an aqueous medium containing water, further a water-soluble organic solvent, a surfactant, a basic neutralizing agent, etc., if necessary. Be served.

Examples of the polyester resin having a hydrophilic group include those containing a metal sulfonate group and / or a carboxyl group as a hydrophilic group in the range of ⁵ to 1000 equivalents / 10 ⁶ g resin. If necessary, polyethylene glycol having a molecular weight of 100 to 6000 can be added to the resin in a range not exceeding 30% by weight (based on the polyester resin).

As the polyamide resin having a hydrophilic group, as a hydrophilic group, at least one selected from a sulfonate metal base, a carboxyl group, an alkyl group-substituted tertiary nitrogen, and an alkylene group-substituted tertiary nitrogen in a range of ⁵ to 1000 equivalents / 10 ⁶ g resin. The thing contained is mentioned. The resin may include polyethylene diamine or polyethylene glycol having a molecular weight of less than 6000, if necessary.
It can be blended within a range not exceeding the weight% (based on the polyamide resin).

As the polyurethane resin having a hydrophilic group, at least one of a sulfonate metal base, a carboxyl group, an alkyl group-substituted tertiary nitrogen and an alkylene group-substituted tertiary nitrogen as a hydrophilic group is used.
The seeds may be contained in the range of 5-1000 equivalent / 10 ⁶ resin. The resin may include polyethylene diamine or polyethylene glycol having a molecular weight of less than 6000, if necessary.
It can be blended within a range not exceeding the weight% (based on the polyurethane resin).

As the ionic polymer complex having a hydrophilic group, for example,
A mixture of polyethyleneimine, polyacrylic acid and modified starch is used.

The thickness of the water-based anchor coat layer (3) is 0.3 on a dry basis.
It is preferably set to ˜5 μm.

Laminated Structure The laminated structure of the liquid crystal display panel substrate of the present invention is shown in FIGS. 1 and 2.

FIG. 1 shows a case where another layer is provided on one surface of the polarizing film (1), and the polarizing film (1) / organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material It has a laminated construction of layers (4).

FIG. 2 shows the case where other layers are provided on both sides of the polarizing element film (1), and the base material layer (4) / water-based anchor coat layer (3) / organic solvent-based adhesive layer (2) / polarizer It has a laminated structure of film (1) / organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material layer (4).

Liquid Crystal Display Panel A liquid crystal display panel is produced by laminating a transparent electrode (5) directly or via a protective layer (6) on one side or both sides of a substrate having a laminated constitution shown in FIG. 1 or 2. Further, a reflection plate may be laminated on the surface of the substrate on which the transparent electrode (5) is not installed.

<Transparent Electrode (5)> The transparent electrode (5) is composed of a transparent conductive layer. For forming the conductive layer, a vacuum deposition method, a sputtering method, an ion plating method, a metal spraying method, a metal plating method, a chemical vapor deposition method, a spray method or the like is adopted. Among these, the vacuum vapor deposition method and the sputtering method are particularly recommended as satisfying the two points of forming a thin layer and forming a uniform layer.

As materials for forming the transparent conductive layer, Sn, In, T
Metals such as i and Pb, or oxides thereof are generally used, and when a simple metal is formed on the substrate by the above method, it may be oxidized thereafter if desired. There is also a method of depositing and forming as an oxide layer from the beginning, but first, a film is formed in the form of a simple metal or a lower oxide, and then subjected to an oxidation treatment such as heat oxidation, anodization or liquid phase oxidation to make it transparent. It is also possible to adopt a means for doing so. When a low temperature sputtering method device is used, the oxidation heating step can be omitted. In addition to the above, a noble metal such as Au, Pt, or Ag may be used.

The conductive layer consisting of these metals or their oxides is set to a layer thickness according to the required properties such as transparency and conductivity, but it is usually 100 Å or more, and 300 Å or more to give stable conductivity. Is desirable.

The above-mentioned conductive layer may be usually a single layer, but it may be formed as a plurality of layers in consideration of mechanical strength and chemical resistance. Further, an anchor coat or an overcoat may be applied for the purpose of improving the uniformity and adhesion of the coating, and further improving the wear resistance. Silicon-based or epoxy-based resins are used as the former example, and gelatin, silicone, collodion, etc. are used as the latter example. If necessary, a layer of photoconductive material or a layer of electroluminescent material may be further formed on these.

<Protective Layer (6)> The protective layer (6) is a layer that protects the base material layer (4) and is provided on the base material layer (4). Since it is not preferable for the base material layer (4) to be laminated using a system adhesive, lamination to the base material layer (4) is performed via the water-based anchor coat layer (3).

Here, the protective layer (6) is preferably a single layer or a multi-layer made of a gas permeable resin and / or a cured product of a crosslinkable resin.

The protective layer (6a) made of air proof resin has an oxygen permeability (measured according to ASTM D-1434-75) of 30cc / 24hr ・ m ²・ a.
tm or less, preferably 20cc / 24hr · m ² · atm or less,
Moreover, the peel strength (measured according to ASTM D-1876) from the base material layer (4) is required to be 50 g or more, preferably 150 g or more. If the oxygen transmission rate exceeds 30cc / 24hr ・ m ²・ atm, black spots may appear on the display due to severe conditions with severe temperature changes and long-term use. The peel strength is 50
If it is less than g, the protective layer (6a) may be peeled off in the next step such as transparent electrode treatment, patterning in liquid crystal panel production, acid / alkali aqueous solution treatment, organic chemical treatment, and assembly step.

It should be noted that the visible light transmittance of the laminate of the base material layer (4) and the protective layer (6a) made of this air-permeable resin needs to be 60% or more, and if it is less than 60%, the contrast of the display portion is deteriorated. It is not preferable.

A polymer containing 50 mol% or more of an acrylonitrile component, a vinyl alcohol component or a vinylidene halide component is preferably used as the air-permeable resin satisfying such conditions.

The thickness of the protective layer (6a) formed of these air-permeable resins is set in the range of 1 to 50 μm, preferably 2 to 20 μm. If it is less than 1 μm, the air resistance is insufficient, and if it exceeds 50 μm, it tends to curl when forming a laminate.

In order to provide a protective layer (6a) made of a gas-impermeable resin on the base material layer (4) via the water-based anchor coat layer (3), the gas-impermeable resin is usually used as one or two solvents. Dissolved or dispersed as described above, applied to the base material layer (4), dried,
Heat treatment may be performed as necessary.

The protective layer (6b) made of a crosslinked resin cured product is desirably a phenoxy ether type crosslinkable resin, an epoxy resin,
It is composed of a cured product of a crosslinkable resin selected from acrylic resin, melamine resin, phenol resin or urethane resin. Of these, as typical examples, a phenoxy ether type crosslinkable resin and an acrylic resin will be described in detail.

Among the crosslinkable resins, a particularly preferable resin is a phenoxyether type polymer represented by the following general formula or a phenoxyether type crosslinked polymer in which a polyfunctional compound is crosslinked with a hydrogen moiety of its hydroxyl group.

(In the formula, R ^{1 to} R ⁶ are each hydrogen, a lower alkyl group having 1 to 3 carbon atoms or Br, R ⁷ is a lower alkylene group having 2 to 4 carbon atoms, m is an integer of 0 to 3, and n is 20. To 300.) Also, as the polyfunctional compound to be reacted to obtain a crosslinked polymer, a group having a high reactivity with a hydroxyl group, for example, an isocyanate group, a carboxyl group, a reactivity in a carboxyl group Examples thereof include compounds having two or more derivative groups (eg, halide, active amide, active ester, acid anhydride group, etc.), mercapto, etc., which may be the same or different.

In addition, the acrylic resin mainly contains a compound containing at least three or more acryloyloxy groups or / and a methacryloyloxy group in the molecule (hereinafter, referred to as a polyfunctional (meth) acryloyloxy group-containing compound). A composition containing a functional unsaturated monomer and / or its initial radical reaction product as a main component can be mentioned. Particularly preferred is a polyfunctional unsaturated monomer containing at least 3 or more (meth) acryloyloxy groups in the molecule, in an amount of 50% by weight or more, preferably 70% by weight, based on all unsaturated monomers. Particularly preferably, it is a composition comprising an unsaturated monomer mixture containing 90% by weight or more and / or its initial radical reactant.

These crosslinkable resins can also be layered by the same method as in the case of layering the air-permeable resin.

The protective layer (6b) composed of these cured products of the crosslinkable resin is formed on the water-based anchor coat layer (3) by a usual wet film forming method, dry film forming method, or melt film forming method. The dry film formation method is the most suitable in consideration of the isotropic property.

The thickness of the protective layer (6b) made of a crosslinked resin cured product is usually 1 to 1000 μm, preferably 50 to 500 μm.

<Reflector> As a reflector, a plate made of gold, silver, copper, aluminum, or the like,
A chrome-plated plate, a metal-deposited plastic film, or the like is used.

The liquid crystal display panel produced by using the liquid crystal display panel substrate of the present invention is useful as a liquid crystal display device such as a display for a clock, a calculator, a light quantity adjusting device, an optical shutter graphic display, and the like, and an electroluminescent body. Can also be used as an electrode for a photoconductor, an electrode for a photoconductive photoreceptor, a surface heating element, a light selective transmission film, and the like.

Action In the liquid crystal display panel substrate of the present invention, two intervening layers are provided between the polarizing element film (1) and the base material layer (4).

That is, since the organic solvent-based adhesive layer (2) formed by using an adhesive dissolved or dispersed in an organic solvent is provided on the polarizing element film (1) side, the adhesive force with the polarizing element film (1) is large. On the other hand, since the water-based anchor coat layer (3) formed by using the anchor agent dissolved or dispersed in the aqueous medium is provided on the base material layer (4) side, the adhesive strength with the base material layer (4) is large and Since the material layer (4) is not eroded and the adhesive force between the organic solvent-based adhesive layer (2) and the water-based anchor coat layer (3) is large, the polarizing film (2) can be used as a base material layer (4). It will adhere firmly.

EXAMPLES Next, the present invention will be further described with reference to examples.

Hereinafter, "parts" are shown on a weight basis.

Example 1 A liquid crystal display panel substrate having the laminated structure shown in FIG. 2 was produced as follows.

A base material layer (4) made of a polycarbonate film (manufactured by Tsutsunaka Plastic Industry Co., Ltd.) having a thickness of 90 μm and a retardation value (R value) of 12 nm was coated with water / alcohol (50/50).
Anchor agent solution (resin concentration 5% by weight, pH 10.2) consisting of ionic polymer complex (Toyo Soda Kogyo Co., Ltd. Toyobain 210K) with (weight ratio) as a solvent component is applied using a wire round doctor with a diameter of 0.2 mm. Then, it was dried at 90 ° C. for about 5 minutes to form an aqueous anchor coat layer (3) having a thickness of 0.5 μm.

On this water-based anchor coat layer (3), a urethane adhesive (Takelac A-371 manufactured by Takeda Pharmaceutical Co., Ltd.) 45
Part, curing agent (Takenate A-1 manufactured by Takeda Pharmaceutical Co., Ltd.
0) Apply an adhesive solution consisting of 7 parts and 50 parts of ethyl acetate using a doctor knife and apply 80 parts in a hot air drier.
It was dried at 0 ° C. for 2 minutes to form an organic solvent-based adhesive layer (2). The coating amount was 12 g / m ² on a dry basis.

Two organic solvent-based adhesive layers (2) / water-based anchor coat layer (3) / base material layer (4) thus obtained were used to prepare two organic solvent-based adhesive layers. (2) are placed so that they face each other, and the ethylene-vinyl alcohol copolymer / 2 dichroic dye type polarizing element film (1) is interposed therebetween, and they are stacked, and the temperature is 80 ° C. and the pressure is 3 k.
The layers were integrated by hot pressing at g / cm ² .

Through the above steps, the base material layer (1) / water-based anchor coat layer (3) / organic solvent-based adhesive layer (2) / polarizing element film (1)
A substrate for a liquid crystal display panel shown in FIG. 2 having a laminated structure of / organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material layer (4) was obtained.

The average visible light transmittance of this substrate was as high as 45%, and no whitening or fine irregularities were observed.

Comparative Example 1 A base material layer (4) / organic solvent adhesive layer (2) / polarizer film (1) / organic solvent was prepared in the same manner as in Example 1 except that only the formation of the water-based anchor coat layer (3) was omitted. Adhesive layer (2)
A substrate for a liquid crystal display panel having a laminated structure of / base material layer (4) was produced.

The average visible light transmittance of this substrate was 40%, and slight whitening and fine irregularities were observed.

Embodiment 2 FIG. 4 is a sectional view showing an example of a liquid crystal display panel including the liquid crystal display panel substrate of the present invention.

An aqueous polyester-based anchor agent (Vylon 1930, manufactured by Toyobo Co., Ltd., containing a sulfonate group and a carboxyl group, on one side of a base material layer (4) made of a polycarbonate film having a thickness of 90 μm and a retardation value (R value) of 12 nm, A resin concentration of 30% by weight) was applied using a 0.2 mmφ wire round doctor and dried to form a water-based anchor coat layer (3) having a thickness of 3 μm.

Then, an organic solvent-based adhesive layer (2) made of a urethane-based adhesive was formed on the water-based anchor coat layer (3) in the same manner as in Example 1.

Two organic solvent-based adhesive layers (2) / water-based anchor coat layer (3) / base material layer (4) thus obtained were used to prepare two organic solvent-based adhesive layers. (2) are placed so that they face each other, and the ethylene-vinyl alcohol copolymer / 2 dichroic dye type polarizing element film (1) is interposed therebetween, and they are stacked, and the temperature is 80 ° C. and the pressure is 3 k.
The layers were integrated by hot pressing at g / cm ² .

Through the above steps, the substrate layer (4) / water-based anchor coat layer (3) / organic solvent-based adhesive layer (2) / polarizing element film (1)
A substrate for a liquid crystal display panel shown in FIG. 2 having a laminated structure of / organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material layer (4) was obtained.

The average visible light transmittance of this substrate was 43%, which was preferable.

Next, both base material layers (4) of this liquid crystal display panel substrate,
A water-based anchor coat layer (3), (3) having a thickness of 0.5 μm was formed on (4) in the same manner as described above, and a curable resin solution having the following composition was further applied thereto with a gap of 35 μm using an applicator. After coating and drying at 80 ° C. for 4 minutes, it was heat-crosslinked at 130 ° C. for 20 minutes to form phenoxy ether resin-based protective layers (6b) and (6b).

Finally, a transparent conductive layer having a thickness of 500Å made of a mixture of indium oxide and tin oxide in a weight ratio of 95: 5 was formed on the surface of one protective layer (6b) by a sputtering method to form a transparent electrode (5). .

Thereby, the transparent electrode (5) / protective layer (6b) / water-based anchor coat layer (3) / base material layer (4) / water-based anchor coat layer (3) / organic solvent-based adhesive layer (2) / polarizer Fourth having a laminated structure of film (1) / organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material layer (4) / water-based anchor coat layer (3) / protective layer (6b) The liquid crystal display panel shown in the figure was obtained.

The resistance of the transparent electrode of this liquid crystal display panel is 0.4 kΩ / c
The m ² and average visible light transmittance were 43%, and the polarization degree was 91%, which were preferable. No bubbles or delamination was observed even after a heat resistance test at 100 ° C for 150 hours.

Embodiment 3 FIG. 5 is a cross-sectional view showing an example of a liquid crystal display panel including the liquid crystal display panel substrate of the present invention.

On the organic solvent-based adhesive layer (2) of the organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material layer (4) laminated composition obtained in Example 1, ethylene was added. -Vinyl alcohol copolymer / two-color dye-based polarizing element film (1) was superposed and laminated by thermocompression at a temperature of 80 ° C and a pressure of 3 kg / cm ² . Thereby, the liquid crystal display panel substrate shown in FIG. 1 was obtained.

Subsequently obtained polarizing film for liquid crystal display panel substrate (1)
On the surface, a transparent conductive layer having a thickness of 500Å made of a mixture of indium oxide and tin oxide in a weight ratio of 95: 5 was formed by a sputtering method to form a transparent electrode (5).

As a result, the transparent electrode (5) / polarizer film (1) / organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material layer (4) shown in FIG. A liquid crystal display panel was obtained.

Example 4 As an aqueous anchor coat layer (3), an aqueous polyester anchor agent (manufactured by Toyobo Co., Ltd., Byron 1930, containing sulfonate group and carboxyl group, resin concentration 30%)
Was coated using a 0.2 mmφ wire round doctor, dried, and a substrate for a liquid crystal display panel was prepared in the same manner as in Example 1 except that an anchor coat layer having a thickness of 3 μm was used.

Next, the base material layer (4) of the liquid crystal display panel substrate,
A water-based anchor coat layer (3), (3) having a thickness of 0.5 μm and made of a water-based polyester anchor agent is formed on (4) in the same manner as described above, and a gas-permeable resin solution having the following composition is applied as a gap from above. 70 ~ after applying to 85μm
After drying at 110 ℃ for 10 minutes, a protective layer (6a) with a thickness of 10μm,
(6a) was formed.

Finally, a transparent conductive layer with a thickness of 500A was formed on the surface of one protective layer (6a) by the sputtering method, and the transparent electrode (5) was formed.
I said.

As a result, a liquid crystal display panel having a laminated structure in which the layer (6b) in FIG. 4 was replaced with the layer (6a) was obtained.

The resistance of the transparent electrode of this liquid crystal display panel is 0.6 kΩ / c
The m ² and average visible light transmittance were 43%, and the polarization degree was 91%, which were preferable. No bubbles or delamination was observed even after a heat resistance test at 100 ° C for 150 hours.

Examples 5 to 7 As the base material layer (4), instead of the polycarbonate film, a polyether sulfone film having a thickness of 100 μm and a retardation value (R value) of 14 nm (Example 5), a thickness of 80 μm.
m, a polysulfone film having a retardation value (R value) of 20 nm (Example 6), and a polyarylene ester film having a thickness of 75 μm and a retardation value (R value) of 18 nm (Example 7) were used. Similarly, a liquid crystal display panel substrate was produced.

The average visible light transmittance of this substrate was 43% (Example 5), 42% (Example 6), and 44% (Example 7), respectively, which were preferable.

Examples 8-9 As an aqueous anchor coat layer (3), a resin concentration of 30% by weight
An aqueous polyamide-based anchoring agent solution (containing a sulfonate group, a carboxyl group, an alkyl group-substituted grade nitrogen and an alkylene group-substituted grade nitrogen), and drying the layer to form a layer having a thickness of 3 μm (Example 8), A 2 μm-thick layer formed by applying a solution of an aqueous polyurethane-based anchor agent (containing a sulfonate group, a carboxyl group, an alkyl group-substituted grade nitrogen and an alkylene group-substituted grade nitrogen) having a resin concentration of 20% by weight, and drying the layer ( A liquid crystal display panel substrate was produced in the same manner as in Example 1 except that Example 9) was used.

The visible light average transmittances of this substrate were 43% (Example 8) and 42% (Example 9), respectively.

Embodiment 10 FIG. 3 is a sectional view showing an example of a liquid crystal display panel including the substrate for liquid crystal display panel of the present invention.

The organic solvent-based adhesive layer (2) of the laminate having the laminated structure of the organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) / base material layer (4) in Example 1 / ethylene-on A vinyl alcohol copolymer / two-color dye-based polarizing element film (1) is provided, a water-based anchor coat layer (3) of the same kind is formed on the base material layer (4), and further, Example 2 is applied.
A protective layer (6b) made of the curable resin solution used in step 1 was provided, and finally a transparent electrode (5) was provided thereon.

As a result, the liquid crystal display panel shown in FIG. 3 was obtained.

Effects of the Invention In the liquid crystal display panel substrate of the present invention, the organic solvent-based adhesive layer (2) and the water-based anchor coat layer (3) are provided between the polarizing film (1) and the base material layer (4). ) And are intervening in this order.

The polarizing film (1) / organic solvent-based adhesive layer (2) interface has a large adhesive strength, and the organic solvent-based adhesive layer (2) / water-based anchor coat layer (3) interface has a large adhesive strength, which is water-based. Since the adhesive strength at the interface between the anchor coat layer (3) and the base material layer (4) is also large, the polarizer film (1) and the base material layer (4) are firmly adhered and are Does not cause delamination.

Moreover, since the base material layer (4) is in contact with the water-based anchor coat layer (3) and is not in direct contact with the organic solvent-based adhesive layer (2), the base material layer (4) is attacked by the organic solvent. And has a preferable visible light transmittance.

Furthermore, the substrate of the present invention and a liquid crystal display panel manufactured using the substrate are optically isotropic and do not generate colored interference fringes, have a smooth and hard surface, and have a resistance to a manufacturing process such as liquid crystal assembly. It has chemical resistance and heat resistance (100 ° C or higher), has good adhesion with the sealant, maintains airtightness for a long time, has moisture permeability resistance, has liquid crystal resistance, and is stable for a long time. It has various performances required for liquid crystal display panels.

Therefore, the liquid crystal display panel substrate of the present invention has extremely high quality and is practically useful.

[Brief description of drawings]

FIG. 1 and FIG. 2 are cross-sectional views showing a laminated structure of a liquid crystal display panel substrate of the present invention. FIG. 3 is a sectional view showing an example of a liquid crystal display panel including the liquid crystal display panel substrate of the present invention. FIG. 4 is a cross-sectional view showing an example of a liquid crystal display panel including the liquid crystal display panel substrate of the present invention. FIG. 5 is a cross-sectional view showing an example of a liquid crystal display panel including the substrate for liquid crystal display panel of the present invention. (1) ... Polarizing film, (2) ... Organic solvent-based adhesive layer,
(3) ... Water-based anchor coat layer, (4) ... Base material layer,
(5) ... Transparent electrode, (6) ... Protective layer, (6a) ... Protective layer made of air-permeable resin, (6b) ... Protective layer made of cured crosslinkable resin.

Claims (4)

[Claims] 1. An organic solvent adhesive layer (2) formed by using an adhesive dissolved or dispersed in an organic solvent is provided on at least one surface of a polarizing film (1), and the organic solvent adhesive layer (2) is dissolved thereon in an aqueous medium. Alternatively, a water-based anchor coat layer (3) formed by using a dispersed anchor agent is provided, and a polycarbonate-based resin, polyether sulfone-based resin, polysulfone-based resin, polyarylene ester-based resin, or cellulose-based resin is further formed thereon. Retardation value
A substrate for a liquid crystal display panel having a laminated structure provided with a base material layer (4) made of a non-optically-rotating transparent film or sheet having a thickness of 30 nm or less. 2. The anchor agent constituting the water-based anchor coat layer (3) is at least one anchor agent selected from the group consisting of hydrophilic group-containing polyester resins, polyamide resins, polyurethane resins and ionic polymer complexes. A substrate according to claim 1. 3. The hydrophilic group is at least one hydrophilic group selected from the group consisting of a sulfonate metal base, a carboxyl group, an alkyl group-substituted tertiary nitrogen and an alkylene group-substituted tertiary nitrogen. The substrate according to item 2. 4. The adhesive constituting the organic solvent adhesive layer (2) is a urethane-based, acrylic-based, cyanoacrylic-based, olefin-based, epoxy-based or silicone-based adhesive. The described substrate.