JP2001027753A - Production of laminated sheet for liquid crystal display panel and production of liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform precision work in the production process of a liquid crystal display panel by laminating a light-transmitting plastic film while heating and pressurizing with an adhesive layer to an adhesive sheet prepared to be easily released from the light-transmitting plastic film. SOLUTION: A light-transmitting plastic film 15 is laminated while heating and pressurizing with an adhesive layer 14 by using a roll 18 to an adhesive sheet consisting of a base resin sheet 13 and an adhesive layer 14. Then a light-transmitting metal oxide electrode 16, alignment film 17 or the like are formed on the light-transmitting plastic film 15 to obtain a laminated body. When the alignment film 17 is formed, the layers are kept at 100 to 200 deg.C for 1 to 3 hours. However, since bubbles in the adhesive layer 14 are removed by the roll 18, the adhesive layer 14 and the light-transmitting plastic film 15 are firmly adhered to each other even at that high temperature. As a result, precision work in the production process can be smoothly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a laminated sheet for a liquid crystal display panel used in producing a liquid crystal display panel, and a liquid crystal display using the laminated sheet for a liquid crystal display panel obtained by the method. The present invention relates to a method for manufacturing a panel.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display panel,
Glass, resin sheets, and the like are used for substrates, but the amount of resin sheets used has been gradually increasing due to recent demands for lighter, thinner and smaller electronic devices.

When a liquid crystal display panel is manufactured using a resin sheet, a light-transmitting metal oxide electrode, an alignment film, and the like are formed directly on two resin sheets to form a laminate. After processing, etc., the spacers are sprayed, followed by superposition of these two laminates and sealing of the peripheral part with an adhesive, injection of liquid crystal and sealing of the injection port, lamination of a polarizing plate and a color filter, etc. Had been performed.

However, when a high-precision, large-area liquid crystal display panel is manufactured on a flexible resin sheet, when electrodes are directly formed on the resin sheet as in the conventional case, the base is not provided. Since the material resin sheet is likely to bend, it is difficult to maintain a constant shape in a three-dimensional sense, and therefore, it is not possible to perform highly accurate processing like processing on a glass substrate. There has been a problem that it is difficult to secure the accuracy of alignment and to achieve automation.

[0005] Therefore, an extremely flat translucent plastic film is placed on a predetermined substrate and brought into close contact with the substrate, and various layers such as a translucent metal oxide electrode are formed on the translucent plastic film. The way was being taken. In this method, first, a light-transmitting metal oxide electrode is formed on a light-transmitting plastic film adhered to a substrate, and then an alignment film and the like are formed to form a first laminated substrate. And a spacer is placed on the alignment film. On the other hand, except that the spacers are not sprayed, a second laminated substrate is produced in the same manner as the above method, a sealing agent layer or the like is formed around the second laminated substrate, and the second laminated substrate on which the sealing agent layer is formed is formed. Then, a liquid crystal display panel is manufactured by laminating and bonding a first laminated substrate, and injecting a liquid crystal and sealing an injection port.

The substrate used in the above process does not basically constitute a liquid crystal display panel, and must be removed by peeling off at any stage of the manufacturing process. Therefore, after laminating the second laminated substrate and the first laminated substrate and then bonding and removing the two substrates, or
The substrate is peeled off and removed from one of the laminated substrates in a process before bonding, and after laminating the second laminated substrate and the first laminated substrate, the other laminated substrate is peeled off and removed. Was taking the way.

In the manufacturing process of such a liquid crystal display panel, after a light-transmitting plastic film is brought into close contact with a substrate, a process of removing the substrate from the laminated substrate is performed.
A transparent plastic film must be firmly fixed on the substrate in order to smoothly carry out precise work.

If the translucent plastic film is weakly fixed to the substrate, the translucent plastic film may be wrinkled or broken, making precise work difficult. On the other hand, the base is unnecessary after the injection of the liquid crystal and the sealing of the injection port are performed. Therefore, it is necessary to easily peel the base from the light-transmitting plastic film and the laminated substrate formed thereon. There is.

[0009]

Therefore, when performing various operations on the light-transmitting plastic film, the adhesiveness with the light-transmitting plastic film is high. By irradiating ultraviolet rays, a method of fixing by inserting an adhesive sheet that facilitates peeling between a light-transmitting plastic film and a substrate is used, but such an adhesive sheet was used. Even in this case, a thin air layer (hereinafter, referred to as an air pocket) or air bubbles is formed between the light-transmitting plastic film and the adhesive sheet in the heating step for forming the alignment film, and the subsequent steps Therefore, there is a problem that precise work becomes difficult.

[0010]

Means for Solving the Problems The present inventors have made intensive studies in view of the above, and have found that, in general, the pressure-sensitive adhesive layer for bonding a light-transmitting plastic film formed on an adhesive sheet is used. Found that air bubbles were slightly contained or the air bubbles grew at the time of bonding, and these air bubbles grew by heating etc. and grew larger, causing air pockets. I came to.

That is, a first method for producing a laminated sheet for a liquid crystal display panel according to the present invention comprises a base resin sheet and an adhesive layer formed thereon, and is placed thereon before irradiation with ultraviolet rays. While being strongly adhered to the light-transmitting plastic film for the liquid crystal display panel to be formed, the adhesive force is reduced after irradiation with ultraviolet light, so that the light-transmitting plastic film can be easily separated from the light-transmitting plastic film. The translucent plastic film is laminated on the adhesive sheet A via the pressure-sensitive adhesive layer under heat and pressure.

Further, a second method for producing a laminated sheet for a liquid crystal display panel according to the present invention comprises a base resin sheet, an adhesive layer formed thereon, and a release film attached to the adhesive layer. Before ultraviolet light irradiation, the film adheres firmly to a light-transmitting plastic film for a liquid crystal display panel mounted thereon, but after ultraviolet light irradiation, the adhesive force decreases, and the light-transmitting plastic film After peeling and removing the release film from the adhesive sheet B configured to be easily peeled from the adhesive sheet B, the adhesive sheet B is heated and pressed under the pressure-sensitive adhesive layer through the pressure-sensitive adhesive layer. It is characterized by laminating a translucent plastic film. Hereinafter, the present invention will be described in detail.

[0013] A first method for producing a laminated sheet for a liquid crystal display panel according to the present invention comprises a base resin sheet and an adhesive layer formed thereon, and is placed thereon prior to ultraviolet irradiation. Adhesive strength is such that it adheres firmly to the translucent plastic film for liquid crystal display panels, but its adhesive strength decreases after UV irradiation, and it can be easily peeled off from the translucent plastic film. Sheet A
And laminating the translucent plastic film via the pressure-sensitive adhesive layer under heat and pressure.

First, a method for producing the laminated sheet for a liquid crystal display panel of the first invention will be described. In the first invention, the adhesive sheet A is used. The adhesive sheet A is
It is composed of a base resin sheet made of a normal material that can transmit ultraviolet rays, and an adhesive layer formed thereon and having an adhesive property that changes in adhesiveness when irradiated with ultraviolet rays in a specific wavelength range.

The base resin sheet is not particularly limited as long as it is a resin sheet capable of transmitting ultraviolet rays. Examples thereof include vinyl chloride resin, vinyl chloride / vinylidene chloride copolymer resin, and vinyl chloride / vinyl acetate copolymer. Resin sheets made of resin, polyvinylidene chloride resin, polyolefin, polyvinyl alcohol, polyamide, polyester, polycarbonate, acetyl cellulose and the like can be mentioned.

The pressure-sensitive adhesive layer is preferably composed of, for example, an acrylic resin-based pressure-sensitive adhesive, a UV-crosslinkable compound, a polymerization initiator and the like.

The acrylic resin-based pressure-sensitive adhesive includes, for example, a copolymer of an acrylate monomer and another copolymerizable monomer. The copolymer of the acrylate monomer and another copolymerizable monomer uses the acrylate monomer having a low glass transition point as a main monomer to impart tackiness, while the As other copolymerizable monomers, monomers capable of forming a hard polymer having a high glass transition point to impart cohesiveness, and carboxylic acid groups and hydroxyl groups to improve crosslinkability and adhesion And a monomer having a functional group such as amide group, glycidyl group and hydroxyl group.

Examples of the ultraviolet-crosslinkable compound include acrylic or methacrylic esters as oligomers or monomers which are crosslinked by irradiation with ultraviolet light in a specific wavelength range. Those having an acroyl group or a methacryloyl group are preferred.

Examples of the oligomer include oligoester acrylate, and examples of the monomer include 1,6-hexanediol acrylate, trimethylolpropane triacrylate, and the like.
Ester of polyhydric alcohol such as tetramethylol methane tetraacrylate, dipentaerythritol hexaacrylate and acrylic acid, or 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, tetramethylol methane tetraacrylate, dipentaerythritol hexaacrylate An ester of a polyhydric alcohol such as acrylate and methacrylic acid can be exemplified. In addition, urethane acrylate, epoxy acrylate and the like can also be mentioned.

In preparing the pressure-sensitive adhesive layer, for example,
The ultraviolet-crosslinkable compound is added in an amount of 30 to 100 parts by weight based on 100 parts by weight of the acrylic resin-based pressure-sensitive adhesive. In addition,
Parts by weight indicate the percentage of the weight of the solid content.

The pressure-sensitive adhesive layer may further contain a polymerization initiator, a tackifier and the like. The polymerization initiator is used to promote crosslinking of the ultraviolet-crosslinkable compound by ultraviolet irradiation. In the present invention, a conventionally known polymerization initiator can be used. Examples of these polymerization initiators include benzoin alkyl ethers such as benzoin methyl ether and benzoin propyl ether, aromatic oxyketones such as benzoin, benzyl and benzophenone, aromatic ketones, benzyl dimethyl ketal, and polyvinyl benzophenone. be able to.

The tackifier is not particularly limited, and those conventionally used as pressure-sensitive adhesives can be used. Examples of such tackifiers include xylene resins, rosins and polymerized rosins, hydrogenated rosins, modified rosin resins such as rosin esters, terpene resins, terpene phenol resins, terpene resins such as rosin phenol resins, and aliphatic resins. , Aromatic and alicyclic petroleum resins, cumarone resins, styrene resins, alkylphenol resins and the like.

The amount of the polymerization initiator is preferably 1 to 20 parts by weight based on 100 parts by weight of the ultraviolet-crosslinkable compound. For each component constituting the pressure-sensitive adhesive layer, an appropriate amount of an organic solvent for dissolving them, for example, aromatic hydrocarbons, ketones, or a mixture thereof is added and dissolved to form a pressure-sensitive adhesive layer. A solution composition having a uniform composition can be obtained, and the pressure-sensitive adhesive layer can be formed by applying the solution composition on a base resin sheet by a conventionally known method and drying the solution composition. .

Before the adhesive sheet A is irradiated with ultraviolet light,
While being firmly adhered to the translucent plastic film placed thereon, after ultraviolet irradiation, the adhesive strength is reduced so that the translucent plastic film can be easily separated from the translucent plastic film. I have.

Examples of the translucent plastic film include polycarbonate, polyether sulfone, polyarylate, polyethylene terephthalate, polyethylene-2,6-naphthalate, and polyether / ether ketone.

In the process of manufacturing the liquid crystal display panel, when various layers are formed on the light-transmitting plastic film by using a physical method, a chemical method, or the like, various forces are applied to the light-transmitting plastic film. Acts on conductive plastic films.

In order to form an alignment film or the like, it is necessary to heat these systems. Therefore, the temperature of the entire system including the adhesive sheet A rises.
Even at a temperature of 00 ° C., the adhesive strength between the translucent plastic film and the adhesive sheet A is configured to be strong.

However, the pressure-sensitive adhesive layer formed on the base resin sheet usually contains a small amount of air bubbles. When the air bubbles are trapped, and the temperature becomes high as described above, the air bubbles expand, and they are aggregated to form an air pocket.

Therefore, in the present invention, the adhesive sheet A
Then, under heat and pressure, the light-transmitting plastic film is laminated through the pressure-sensitive adhesive layer to produce a laminated sheet for a liquid crystal display panel, and air bubbles are completely expelled from the pressure-sensitive adhesive layer.

The method of laminating the translucent plastic film while expelling bubbles is not particularly limited. For example, a roll or a drum capable of heating is used. Under the condition that the pressure is 0.01 to 10 MPa / m,
A method in which the roll or drum is pressed against a light-transmitting plastic film placed on an adhesive sheet and rotated to perform lamination, and the like can be mentioned. The temperature at which the above lamination is performed is more preferably 60 to 130 ° C., and the pressure is more preferably 0.05 to 5 MPa.

Since the thickness of the plastic film is as thin as several tens of μm to several hundreds of μm, the temperature of the translucent plastic film and the temperature of the adhesive sheet during pressurization can be reduced by heating the roll or the like. Can be almost the same as the temperature of

In the laminated sheet for a liquid crystal display panel manufactured in this manner, the adhesive sheet A and the light-transmitting plastic film are firmly adhered to each other even at a high temperature of 100 to 200 ° C., and bubbles are completely eliminated. No air bubbles or air pockets are formed because they are expelled. 10
The adhesive strength between the adhesive sheet A and the translucent plastic film at a high temperature of 0 to 200 ° C. is preferably 40 g / inch or more, more preferably 40 to 200 g / inch.

Thereafter, various layers are formed on the light-transmitting plastic film constituting the laminated sheet for a liquid crystal display panel. In this case, too, between the light-transmitting plastic film and the adhesive sheet A, In this method, a layer having an accurate shape can be formed at an accurate position without occurrence of displacement or peeling.

The adhesive sheet A has an adhesive force with a translucent plastic film at room temperature before irradiation with ultraviolet light.
More preferably, it is 100 g / inch or more. This is because in the process of manufacturing the liquid crystal display panel, various larger forces act at room temperature.

On the other hand, when the adhesive sheet A is irradiated with ultraviolet light, the adhesive force between the adhesive sheet A and the translucent plastic film decreases, and the adhesive sheet A is removed from the translucent plastic film. It can be easily peeled off. It is preferable that the adhesive strength with the translucent plastic film at normal temperature after irradiation with ultraviolet rays is 20 g / inch or less.

As a result of the decrease in the adhesive strength of the adhesive sheet A, for example, when the steps of forming a plurality of layers on the translucent plastic film and manufacturing the liquid crystal display panel are completed, For example, by irradiating ultraviolet rays using a high-pressure mercury lamp, the adhesive sheet A can be easily peeled off, and a desired laminate for a liquid crystal display panel can be easily obtained.

The method of irradiating the pressure-sensitive adhesive layer with ultraviolet light is not particularly limited, and a conventionally used method can be used. For example, a xenon lamp, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, or an ultra-high-pressure A method of irradiating for several seconds to several minutes using an ultraviolet light source such as a mercury lamp can be used.

The pressure-sensitive adhesive layer has a thickness of 254 nm of a low-pressure mercury lamp.
It is preferable that the adhesive strength is hardly reduced by ultraviolet rays having a main wavelength of, while the adhesive strength is greatly reduced by ultraviolet rays of a high-pressure mercury lamp having a main wavelength of 365 nm. This is because, in the manufacturing process of the liquid crystal display panel, for example, when patterning a photoresist, ultraviolet rays having a main wavelength of 254 nm from a low-pressure mercury lamp may be irradiated.

Next, a method for manufacturing a liquid crystal display panel using the laminated sheet for a liquid crystal display panel manufactured by the above method will be specifically described. When a liquid crystal display panel is manufactured, first, as shown in FIG. 1A, a roll 18 is used to apply an adhesive under heat and pressure to an adhesive sheet comprising a base resin sheet 13 and an adhesive layer 14. The translucent plastic film 15 is laminated via the agent layer 14 to produce a laminated sheet 20 for a liquid crystal display panel. The above-described method is used as a method for manufacturing the laminated sheet 20 for a liquid crystal display panel.

Next, as shown in FIG. 1B, a laminated sheet 20 for a liquid crystal display panel is bonded onto a substrate 11 made of glass or the like via an adhesive layer 12. After this, FIG.
(C) As shown in FIG.
A light-transmitting metal oxide electrode 16, an alignment film 17 and the like are formed thereon, and a laminate used for a liquid crystal display panel is manufactured.

In the step shown in FIG.
When forming 7, the part including the adhesive sheet is heated. Usually, when the alignment film 17 is formed, these systems are kept at 100 to 200 ° C. for 1 to 3 hours. In the present invention, air bubbles in the pressure-sensitive adhesive layer 14 are expelled by the roll 18 in the step shown in FIG. Therefore,
Even at such a high temperature, no bubbles or air pockets are generated between the pressure-sensitive adhesive layer 14 and the translucent plastic film 15, and the two are firmly adhered to each other. As a result, the precise work in the step shown in FIG. 1 (c) can proceed smoothly.

The reason why the adhesive sheet is adhered to the substrate 11 made of a solid such as glass via the adhesive layer 12 is to fix the adhesive sheet to the firm substrate 11. Base resin sheet 1 constituting a functional sheet
When 2 is not too thick and easily bends or wrinkles, it is preferable to bond the adhesive sheet to the base 11.

Next, by irradiating the pressure-sensitive adhesive layer 14 with, for example, ultraviolet light having a main wavelength of 365 nm of a high-pressure mercury lamp, as shown in FIG. The pressure-sensitive adhesive layer 14) can be easily peeled off from the translucent plastic film 15 or the like. There is no particular limitation on the time at which the adhesive sheet is peeled off from the light-transmitting plastic film, and in the step of manufacturing the liquid crystal display panel, the time may be removed as appropriate so that the work proceeds smoothly. Thereafter, a liquid crystal display panel is manufactured as in the conventional case.

A second method for producing a laminated sheet for a liquid crystal display panel of the present invention comprises a base resin sheet, an adhesive layer formed thereon, and a release film attached to the adhesive layer. Before UV irradiation, the film adheres firmly to the light-transmitting plastic film for the liquid crystal display panel placed thereon, but after UV irradiation, the adhesive strength is reduced, and the light-transmitting plastic film is easily separated from the light-transmitting plastic film. After peeling and removing the release film from the adhesive sheet B configured to be capable of being peeled off, the adhesive sheet B is subjected to the light transmission through the adhesive layer under heat and pressure. It is characterized by laminating a conductive plastic film.

In the second aspect of the present invention, the first sheet comprising only the base resin sheet and the pressure-sensitive adhesive layer is different in that the adhesive sheet B used comprises the base resin sheet, the pressure-sensitive adhesive layer and the release film. Different from the adhesive sheet A of the invention. However, the base resin sheet and the pressure-sensitive adhesive layer are configured similarly to the adhesive sheet A.

As described above, the reason why the release film is attached on the pressure-sensitive adhesive layer is that the adhesive sheet is once prepared and then stored and transported. This is to protect the layer from dust and dirt.

Accordingly, when producing a laminated sheet for a liquid crystal display panel, the release film is peeled off from the adhesive sheet B and removed, and then the adhesive sheet is applied to the adhesive sheet B under heat and pressure. The translucent plastic film is laminated through the layers. The method of lamination is the same as that of the first invention.

Thereafter, a light-transmitting metal oxide electrode, an alignment film and the like are formed in the same manner as in the first embodiment of the present invention.
The adhesive sheet is peeled off from the translucent plastic film 15 or the like to produce a liquid crystal display panel. The method of manufacturing the liquid crystal display panel is the same as that of the first invention.

[0049]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In addition, regarding the compounding amount of each component in the following Examples and Comparative Examples, those other than the solvent are parts by weight of solid content.

Example 1 First, 100 parts by weight of an acrylic resin-based pressure-sensitive adhesive (Alontack S-1601 manufactured by Toa Gosei Co., Ltd.), 50 parts by weight of an ultraviolet-crosslinkable compound (Aronix M-400 manufactured by Toa Gosei Co., Ltd.), and photopolymerization was started. 1.6 parts by weight of an agent (Circa Specialty Chemicals, Irgacure 500), 16 parts by weight of a tackifier (Arakawa Chemical Industries, Ltd., KE-604), and 33 parts by weight of methyl ethyl ketone were added to the container in the above proportions. By mixing, a solution composition for forming an adhesive layer was prepared.

Next, the obtained solution composition was applied to a thickness of 25
μm polyethylene terephthalate (PET), and dried at 140 ° C. for 1 minute to obtain 20 μm
To form an adhesive sheet A. Immediately after producing the adhesive sheet A comprising the base resin sheet and the adhesive layer, a polycarbonate (PC) film is placed on the adhesive layer of the adhesive sheet A, and then a roll having a temperature of 100 ° C. And laminated by pressing against a translucent plastic film at a pressure of 0.1 MPa and rotating to obtain a laminated sheet for a liquid crystal display panel.

The obtained laminated sheet for a liquid crystal display panel was subjected to a heating at room temperature and 130 ° C. before irradiation with ultraviolet light.
Check for air bubbles and air pockets after time, 1 before UV irradiation
The adhesive force with the PC film at a temperature of 30 ° C. and the adhesive force with the PC film at normal temperature after irradiation with ultraviolet rays were measured and evaluated using the following method. The results are shown in Table 1.

[0053]Evaluation method  (1) Measurement of adhesive strength before UV irradiation The obtained laminated sheet for a liquid crystal display panel is 25 mm wide and 25 mm long.
Cut to 100mm and left at room temperature for 20 minutes
As a test piece, using an Instron 1175 type testing machine,
At room temperature, at a tensile speed of 300 mm / min.
A 90 ° peel test was performed, and the adhesive strength was measured.

Similarly, using an Instron 1175-type testing machine, under an atmosphere of 130 ° C., a tensile speed of 300 mm
A 90 ° peel test was performed on another test piece prepared in the same manner as described above under the condition of / min, and the adhesive strength was measured.

(2) Measurement of air pockets A laminated sheet for a liquid crystal display panel was prepared with a width of 50 mm and a length of 100.
mm, the glass was fixed to a fixing glass with a two-component curing type epoxy adhesive, and left for 1 hour to obtain a test piece.

The test piece was placed in an oven at 130 ° C. for 2 hours and then taken out. Using a loupe, the presence or absence of air bubbles and air pockets was visually observed and evaluated according to the following criteria. ◎: Air accumulation (bubbles) is not observed at all ○: 1 to 3 bubbles are observed ×: 5 or more bubbles are observed

(3) Measurement of Adhesive Force after Irradiation with Ultraviolet Light A test piece similar to the test piece used at the time of measuring the adhesive force before irradiation with ultraviolet light was prepared, and this test piece was subjected to a main wavelength of 365 μm and 120 W from the polyethylene terephthalate side. / Cm for 7 seconds. Then, Instron 1175
The test piece was subjected to a 90 ° peel test at room temperature at a tensile speed of 300 mm / min using a mold type testing machine, and the adhesive strength was measured.

Example 2 In the same manner as in Example 1, an adhesive layer having a thickness of 20 μm was formed on a base resin sheet, and a release PE was formed on the adhesive layer.
After the T is placed on the roll, the temperature of the roll is set to 0.
At a pressure of 1 MPa, the film was pressed against a light-transmitting plastic film and rotated to perform lamination, thereby producing an adhesive sheet B. Thereafter, the adhesive sheet B was left at room temperature for one week.

Next, after the release PET of the adhesive sheet B was peeled off, a PC film was placed on the pressure-sensitive adhesive layer in the same manner as in Example 1, and a pressure of 100 ° C. was applied using a roll. At a pressure of 0.1 MPa, the laminate was pressed against a light-transmitting plastic film and rotated to laminate, thereby obtaining a laminated sheet for a liquid crystal display panel. Using this laminated sheet for a liquid crystal display panel, the air pocket was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 1 An adhesive sheet A comprising a base resin sheet and a pressure-sensitive adhesive layer prepared in the same manner as in Example 1 was 25 mm wide and 100 mm long.
mm, and this was superimposed on a PC film, reciprocated 5 times with a 3 kg roller, pressed and contacted, and allowed to stand at room temperature for 20 minutes to obtain a test piece. About the obtained test piece, the air pocket was measured similarly to Example 1, and evaluation was performed. The results are shown in Table 1.

Comparative Example 2 An adhesive sheet B composed of a base resin sheet, a pressure-sensitive adhesive layer, and a release PET prepared in the same manner as in Example 2 was 25 m wide.
m, 100 mm in length, and after peeling off the peeled PET, this was overlaid on a PC film, reciprocated 5 times with a 3 kg roller, pressed and adhered, and left at room temperature for 20 minutes to obtain a test piece. About the obtained test piece, the air pocket was measured similarly to Example 1, and evaluation was performed. The results are shown in Table 1.

[0062]

[Table 1]

As shown in Table 1 above, the laminated sheet for a liquid crystal display panel produced in the example was formed by laminating a translucent plastic film on an adhesive sheet under heat and pressure using a roll. Air bubbles in the pressure-sensitive adhesive layer constituting the sheet are expelled, and the base resin sheet and the light-transmitting plastic film are strongly adhered to each other. Therefore,
Even in an atmosphere at 130 ° C., no air bubbles or air pockets are generated, and a liquid crystal display panel can be manufactured favorably.

[0064]

According to the method for producing a laminated sheet for a liquid crystal display panel of the present invention, since the above-mentioned constitution is employed, bubbles in the pressure-sensitive adhesive layer constituting the adhesive sheet are expelled, and the transparent resin sheet and the base resin sheet are removed. It adheres strongly to the optical plastic film, and does not generate bubbles or air stagnation even in a high-temperature atmosphere in the process of manufacturing a liquid crystal display panel.
As a result, precise operations in the process of manufacturing the liquid crystal display panel can be smoothly performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a manufacturing process of a liquid crystal display panel using an adhesive sheet for a liquid crystal display panel of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Base 12 Adhesive layer 13 Base resin sheet 14 Adhesive layer 15 Translucent plastic film 16 Translucent metal oxide electrode 17 Alignment film 18 Roll 20 Laminated sheet for liquid crystal display panels

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideaki Suzuki 3-2-15 Meiwadori, Hyogo-ku, Kobe Bando Chemical Co., Ltd. (72) Inventor Hideo Kuroda 3-2-15 Meiwadori, Hyogo-ku, Kobe Bando Chemical (72) Inventor Yoshio Taguchi 3-2-15 Meiwadori, Hyogo-ku, Kobe Bando Chemical Co., Ltd. F-term (reference) 2H090 JB03 JB11 JC00 LA01

Claims (4)

[Claims] 1. A base resin sheet and a pressure-sensitive adhesive layer formed thereon, which are firmly adhered to a translucent plastic film for a liquid crystal display panel placed thereon before being irradiated with ultraviolet rays. On the other hand, after ultraviolet irradiation, the adhesive force is reduced, and the adhesive sheet A configured to be easily peeled off from the light-transmitting plastic film,
A method for producing a laminated sheet for a liquid crystal display panel, comprising laminating the translucent plastic film through the adhesive layer under heat and pressure. 2. A liquid crystal display comprising a base resin sheet, a pressure-sensitive adhesive layer formed thereon, and a release film attached to the pressure-sensitive adhesive layer. An adhesive sheet B which is firmly adhered to a light-transmitting plastic film for a panel, but has a reduced adhesive strength after irradiation with ultraviolet light, and can be easily peeled off from the light-transmitting plastic film. After the release film is peeled off and removed, the translucent plastic film is laminated on the adhesive sheet B via the pressure-sensitive adhesive layer under heating and pressure, for a liquid crystal display panel. A method for producing a laminated sheet. 3. Using a heatable roll or drum,
The roll or the drum is pressed against the translucent plastic film placed on the adhesive sheet under the condition that the temperature under heating is 50 to 150 ° C. and the pressure under pressure is 0.01 to 10 MPa / m. 3. The method for producing a laminated sheet for a liquid crystal display panel according to claim 1, wherein the laminate is rotated to perform lamination. 4. A method for manufacturing a liquid crystal display panel, comprising using the laminated sheet for a liquid crystal display panel obtained by the method according to claim 1.