JP2000221463A - Adhesive sheet for liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesive sheet for a liquid crystal display panel which has high adhesive strength with a light-transmissive plastic film in the case the adhesive strength is necessary even after going through a work process under the high temperature of 120-130 deg.C, in which no slippage or the like occurs even in the case force is applied to the light-transmissive plastic film and which is easily released in the case the releasing is necessary. SOLUTION: The adhesive sheet, being an adhesive sheet able to transmit ultraviolet rays, is firmly fixed to a light-transmissive plastic film layer during manufacturing of a liquid crystal display panel and is easily released from the light-transmissive plastic film layer by irradiating the UV rays after the manufacturing of the liquid crystal display panel. Besides the adhesive sheet is the adhesive sheet for the liquid crystal display panel provided with an adhesive layer comprising 5-100 pts.wt. ultraviolet-crosslinking resin, 2-50 pts.wt. adhesiveness imparting agent, 0.1-10 pts.wt. polymerization initiator, 0.5-10 pts.wt. crosslinking agent and 1-20 pts.wt. silicone resin with respect to 100 pts.wt. elastic polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sheet for a liquid crystal display panel used in a process for manufacturing a liquid crystal display panel.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display panel,
Glass, resin sheets, and the like are used as substrates, but the amount of resin sheets used has been 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 transparent metal oxide electrode and an alignment film are formed directly on two resin sheets to form a laminate, and a rubbing treatment is performed. After that, the spacers are scattered, followed by the superposition of these two laminates, 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. The process was going on.

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 layer is formed on a predetermined adhesive sheet for a liquid crystal display panel, and a translucent metal oxide electrode is formed on the translucent plastic film layer. After forming a film and the like to produce a first laminated substrate, a second laminated substrate produced in the same manner and a first laminated substrate are superimposed, and after performing various processes, liquid crystal injection and injection are performed. The entrance was sealed, and the adhesive sheet for a liquid crystal display panel was peeled off from the laminated substrate.

[0006] In the above process, after forming a translucent plastic film on the adhesive sheet for a liquid crystal display panel, a precise process is performed until the adhesive sheet for a liquid crystal display panel is peeled off from the translucent plastic film. In order for the work to proceed smoothly, a translucent plastic film must be firmly fixed on the adhesive sheet for a liquid crystal display panel.

If the translucent plastic film is weakly fixed to the adhesive sheet for a liquid crystal display panel, the translucent plastic film may be wrinkled or broken, making precise work difficult. On the other hand, after injecting the liquid crystal and sealing the injection port, the adhesive sheet for the liquid crystal display panel becomes unnecessary because the adhesive sheet for the liquid crystal display panel is not required. It is necessary that the adhesive sheet for a liquid crystal display panel can be easily peeled off. That is, when performing various operations on the light-transmitting plastic film, the liquid crystal has high adhesiveness to the light-transmitting plastic film, while when peeling, the liquid crystal is easily peeled from the light-transmitting plastic film. An adhesive sheet for a display panel is desired.

As such an adhesive sheet for a liquid crystal display panel, the present inventors have already proposed an adhesive sheet for a liquid crystal display panel using a UV-curable adhesive for an adhesive layer. Satisfy the characteristics required for the adhesive sheet for a liquid crystal display panel as described above. However, in the adhesive sheet for a liquid crystal display panel proposed by the present inventors, the adhesive strength sometimes changes when the use temperature changes. That is, when the degree of decrease in the adhesive force after UV irradiation was compared between the case where the work process was performed at room temperature and the case where the work process was performed at a high temperature of 120 to 130 ° C., the high temperature of 120 to 130 ° C. When the lower working process was performed, the degree of decrease in the adhesive strength after UV irradiation was small in some cases.

[Problems to be solved by the invention]

[0009] In view of the above, the present invention is not limited to the case where an adhesive force is required even after a working process at a high temperature of 120 to 130 ° C as well as at a normal temperature. It has a high adhesive strength to the light-transmitting plastic film to be applied, and no deviation occurs when a force is applied to the light-transmitting plastic film. It is an object of the present invention to provide an easy-to-use adhesive sheet for a liquid crystal display panel.

[0010]

According to the present invention, there is provided an adhesive sheet capable of transmitting ultraviolet light used in a manufacturing process of a liquid crystal display panel, wherein the adhesive sheet is transparent during the manufacturing of the liquid crystal display panel. It is strongly fixed to the light-transmitting plastic film layer and can be easily peeled off from the light-transmitting plastic film layer by irradiating UV after the liquid crystal display panel is manufactured. 5 to 1 with respect to 100 parts by weight of the polymer
00 parts by weight of an ultraviolet crosslinkable resin, 2 to 50 parts by weight of a tackifier, 0.1 to 10 parts by weight of a polymerization initiator, and 0.5 to 1 part by weight.
An adhesive sheet for a liquid crystal display panel, comprising an adhesive layer comprising 0 parts by weight of a crosslinking agent and 1 to 20 parts by weight of a silicone resin. Hereinafter, the present invention will be described in detail.

The adhesive sheet for a liquid crystal display panel of the present invention is a sheet that can transmit ultraviolet rays. The adhesive sheet for the liquid crystal display panel is a sheet capable of transmitting ultraviolet light, when irradiated with ultraviolet light, by transmitting ultraviolet light to change the properties of the adhesive layer of the adhesive sheet for liquid crystal display panel, the This is for changing the adhesiveness with the light-transmitting plastic film layer made of PC (polycarbonate) or the like formed thereon.

That is, a flat translucent plastic film layer is formed on the adhesive sheet for a liquid crystal display panel by using various coating methods and the like. The light-transmitting plastic film layer formed above is firmly adhered to the light-transmitting plastic film layer before irradiation with ultraviolet light, and even if a force acts on the light-transmitting plastic film layer, the light-transmitting plastic film layer is separated or misaligned. Not configured.

Accordingly, for example, when various layers are formed on the light-transmitting plastic film layer by a physical method, a chemical method, or the like, various forces are applied to the light-transmitting plastic film. Although it acts on the layer, even if such a force acts, there is no displacement or peeling between the translucent plastic film layer and the adhesive sheet for a liquid crystal display panel, and therefore, the formation. There is no positional deviation or the like in the layer to be formed, and a layer having an accurate shape can be formed at an accurate position.

On the other hand, when ultraviolet rays are irradiated, the adhesive strength between the adhesive sheet for a liquid crystal display panel and the transparent plastic film layer is reduced, and the adhesive sheet for a liquid crystal display panel is removed from the transparent plastic film layer. Can be easily peeled off. So, for example,
A plurality of layers are formed on the light-transmitting plastic film layer, and when a predetermined step is completed, the adhesive sheet for the liquid crystal display panel is peeled off to obtain a target liquid crystal display panel. A laminate or the like can be obtained.

The above-mentioned translucent plastic film layer itself may be provided with adhesiveness, and the adhesiveness may be changed by irradiation with ultraviolet rays. However, the translucent plastic film layer which finally constitutes the liquid crystal display panel may be provided. It is not preferable that the properties themselves change due to ultraviolet rays. Therefore, in the present invention, as described above, the adhesiveness of the pressure-sensitive adhesive layer of the adhesive sheet for a liquid crystal display panel is changed by irradiation with ultraviolet rays.

The above-mentioned adhesive sheet for a liquid crystal display panel comprises:
It may be composed of only one sheet, and the sheet may have the above-described properties, but is formed on a base resin sheet made of a normal material that can transmit ultraviolet rays and adhered thereto by irradiation of ultraviolet rays A pressure-sensitive adhesive layer having a variable property is preferable from an economic viewpoint. Further, in the production of a liquid crystal display panel to be described later, the base resin sheet and the pressure-sensitive adhesive layer are laminated via an adhesive layer on a base made of glass or the like in order to improve workability in a production process. It may be.

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 comprises an elastic polymer, a UV-crosslinkable resin, a tackifier, a polymerization initiator, a crosslinker, and a silicone resin. As the elastic polymer, for example,
Examples thereof include a saturated polyester resin, a polyacrylate, an acrylate monomer, a copolymer of a monomer copolymerizable with the acrylate monomer, and a polyurethane resin.

Examples of the UV-crosslinkable resin include, for example,
Low molecular weight compounds having at least two or more ultraviolet-polymerizable carbon-carbon double bonds in the molecule and capable of forming a three-dimensional network can be used. As the low molecular weight compound,
Examples include an ultraviolet-crosslinkable acrylate compound, an ultraviolet-crosslinkable urethane acrylate compound, and an ultraviolet-crosslinkable epoxy acrylate compound.

The above-mentioned ultraviolet-crosslinkable acrylate compound refers to an acrylate or methacrylate ester as an oligomer or monomer which is crosslinked by irradiation with ultraviolet rays, and has at least two acroyl groups or methacryloyl groups in the molecule.

Examples of the oligomer include oligoester acrylate, and examples of the monomer include 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, tetramethylolmethanetetraacrylate, and dipentane. Esters of polyhydric alcohols such as erythritol hexaacrylate and acrylic acid; polyhydric alcohols such as 1,6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, tetramethylolmethane tetramethacrylate, dipentaerythritol hexamethacrylate and methacrylic acid; And the like.

The UV-crosslinkable urethane acrylate compound includes, for example, a terminal isocyanate urethane polymer obtained by reacting a polyol compound such as a polyester type or a polyether type with a polyvalent isocyanate compound, and a hydroxyl group-containing (meth And acrylates.

As the polyvalent isocyanate compound,
For example, 2,4-tolylene diisocyanate, 2,6-
Examples include tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, diphenylmethane-4,4-diisocyanate, and the like. Examples of the (meth) acrylate include 2-hydroxyethyl (meth) acrylate, 2
-Hydroxypropyl (meth) acrylate, polyethylene glycol (meth) acrylate and the like.

Examples of the ultraviolet-crosslinkable epoxy acrylate compound include epoxy acrylates based on novolak type epoxy resins and bisphenol A
An epoxy acrylate based on a type epoxy resin can be used.

The amount of the UV-crosslinkable resin is 5 to 100 parts by weight based on 100 parts by weight of the elastic polymer. When the compounding amount of the ultraviolet-crosslinkable resin is less than 5 parts by weight, even if the obtained pressure-sensitive adhesive layer is irradiated with ultraviolet light, its adhesive force does not substantially change. Although the adhesive strength can be reduced, the pressure-sensitive adhesive layer may remain on the counterpart member at the time of peeling, and thus is limited to the above range. Preferably, it is 10 to 80 parts by weight.

The tackifier is not particularly limited.
What has been conventionally used as a tackifier can be used. As such a tackifier, for example, xylene resin, rosin, polymerized rosin, hydrogenated rosin,
Modified rosin resin such as rosin ester, terpene resin,
Examples thereof include terpene resins such as terpene phenol resins and rosin phenol resins, aliphatic, aromatic and alicyclic petroleum resins, cumarone resins, styrene resins, and alkylphenol resins.

The amount of the tackifier is 2 to 50 parts by weight based on 100 parts by weight of the elastic polymer. When the compounding amount of the tackifier is less than 2 parts by weight, the adhesive force or the adhesive force tends to be insufficient, and when the compounding amount exceeds 50 parts by weight, the resulting adhesive layer has a reduced adhesive force after being irradiated with ultraviolet rays. Is small, and the pressure-sensitive adhesive layer may remain on the mating member at the time of peeling, so that it is limited to the above range.

The polymerization initiator is used to promote crosslinking of the ultraviolet-crosslinkable resin by irradiation with ultraviolet rays.
The polymerization initiator is not particularly limited, and a conventionally known polymerization initiator can be used. Examples of such a polymerization initiator include benzoin alkyl ethers such as benzoin methyl ether and benzoin propyl ether; aromatic oxyketones and aromatic ketones such as benzoin, benzyl and benzophenone; benzyl dimethyl ketal and polyvinyl benzophenone. Can be mentioned. The amount of the polymerization initiator is 0.1 to 10 parts by weight based on 100 parts by weight of the elastic polymer. If the amount of the polymerization initiator is less than 0.1 part by weight, the crosslinking of the ultraviolet-crosslinkable resin does not proceed even when irradiated with ultraviolet light, so that the degree of decrease in the adhesive strength is small and even if the amount exceeds 10 parts by weight. The effect as a polymerization initiator does not change much and is not economical, so that it is limited to the above range.

The crosslinking agent is not particularly restricted but includes, for example, terminal isocyanate compounds. The compounding amount of the crosslinking agent is 0.5 to 10 parts by weight based on 100 parts by weight of the elastic polymer. If the compounding amount of the crosslinking agent is less than 0.5 part by weight, the pressure-sensitive adhesive layer may remain on the partner member when peeled off, and if it exceeds 10 parts by weight, the initial adhesive strength tends to be insufficient. It is limited to the above range.

The silicone resin is not particularly limited, and includes, for example, a silicone resin having a highly three-dimensionally crosslinked network structure, a silicone resin having a structure in which a plurality of OH groups and methyl groups are bonded to Si atoms, and the like. be able to. These silicone resins are preferably added as fine powder when preparing the pressure-sensitive adhesive layer. Of these, silicone resin powders soluble in various organic solvents and silicone oils having a small number of SiOH groups and a large number of methyl groups are particularly preferred. Specific examples of the silicone resin powder soluble in the organic solvent include Trefil R-910 (manufactured by Dow Corning Toray).

The amount of the silicone resin is 1 to 20 parts by weight based on 100 parts by weight of the elastic polymer.
If the amount of the silicone resin is less than 1 part by weight,
UV after working process under high temperature of 120-130 ° C
If the degree of decrease in adhesive strength after irradiation is small and exceeds 20 parts by weight, the surface of the adhesive becomes considerably cloudy, UV does not transmit even when irradiated with UV, and the adhesive strength may not be reduced. Therefore, it is limited to the above range.

As a method of forming the pressure-sensitive adhesive layer having the above structure on the base resin sheet, for example, the following methods can be mentioned. First, a solution composition having a uniform composition for forming a pressure-sensitive adhesive layer is obtained by dissolving the components constituting the pressure-sensitive adhesive layer in an appropriate amount of an organic solvent for dissolving the components. Next, the above pressure-sensitive adhesive layer can be formed by applying the solution composition onto a base resin sheet by a conventionally known method and drying the solution. Examples of the organic solvent include aromatic hydrocarbons, ketones, and mixtures thereof.

The pressure-sensitive adhesive layer having such a structure can be used at a high temperature of 120 to 130 ° C. as well as at a normal temperature, before it is irradiated with ultraviolet rays. As a result of having an adhesive property and strongly bonding the translucent plastic film layer and the base resin sheet, the adhesive sheet for a liquid crystal display panel is firmly adhered to the translucent plastic film layer. . On the other hand, when irradiated with ultraviolet light, the pressure-sensitive adhesive layer does not significantly decrease the adhesiveness to the base resin sheet, but decreases the adhesive strength to the light-transmitting plastic film layer, and as a result, the liquid crystal display The peeling of the panel adhesive sheet from the light-transmitting plastic film layer is facilitated.

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.

Since the adhesive sheet for a liquid crystal display panel having the adhesive layer has such properties,
It is suitably used in a manufacturing process of a liquid crystal display panel.
About the manufacturing process of the said liquid crystal display panel, FIG.
This will be described with reference to FIG. FIG. 1 (a)-(b)
FIG. 3 is an explanatory view for explaining one embodiment of a process for producing a liquid crystal display panel using the adhesive sheet for a liquid crystal display panel of the present invention. In this case, as shown in FIG. 1A, first, an adhesive sheet for a liquid crystal display panel comprising a base resin sheet 13 and an adhesive layer 14 is placed on a base 11 made of glass or the like. Glue through. After this,
A translucent plastic film layer 15 on the adhesive layer 14
Is formed on the translucent plastic film layer 15,
By forming the translucent metal oxide electrode 16, the alignment film 17, and the like, a laminated substrate for a liquid crystal display panel is manufactured.

In the above step, the adhesive sheet for a liquid crystal display panel is firmly adhered to the translucent plastic film layer, so that a precise operation can be smoothly performed. The reason why the adhesive sheet for a liquid crystal display panel is adhered to the substrate 11 made of a solid such as glass via an adhesive 12 is to fix the adhesive sheet for a liquid crystal display panel to the firm substrate 11. When the base resin sheet 12 constituting the adhesive sheet for a liquid crystal display panel is not so thick, easily bent or wrinkled, the adhesive sheet for a liquid crystal display panel is bonded to the base 11. It is preferable to keep it.

Thereafter, as shown in FIG. 1 (a), when the pressure-sensitive adhesive layer 14 is irradiated with ultraviolet rays, as shown in FIG. 1 (b), the adhesive sheet for a liquid crystal display panel is turned into a transparent plastic film. It can be easily separated from the layer 15 or the like. The timing of peeling the adhesive sheet for the liquid crystal display panel from the light-transmitting plastic film layer is not particularly limited, and in the manufacturing process of the liquid crystal display panel,
Peeling may be performed at appropriate times so that the work proceeds smoothly.

As described above, in the adhesive sheet for a liquid crystal display panel of the present invention, the adhesive sheet for a liquid crystal display panel and the translucent plastic film are firmly adhered before irradiation with ultraviolet light. After ultraviolet irradiation, the translucent plastic film has a property that it can be easily peeled from the adhesive sheet for a liquid crystal display panel, and due to this characteristic, the adhesive sheet for a liquid crystal display panel has, for example, It can also be suitably used in the production of a liquid crystal display panel including a working step at a high temperature of 120 to 130 ° C.

[0039]

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. The unit of the compounding amount shown in Table 1 is "parts by weight".

Example 1 An adhesive solution composition having the composition shown in Table 1 was prepared.
Next, the obtained adhesive solution composition was applied to polyethylene terephthalate (PET) having a thickness of 25 μm,
For 1 minute to form an adhesive layer having a thickness of 10 μm on the PET. Furthermore, a 25-μm-thick release-treated PET was laminated to prepare an adhesive sheet for a liquid crystal display panel. The adhesive force of the obtained adhesive sheet for a liquid crystal display panel before and after irradiation with ultraviolet light when treated at normal temperature and 120 to 130 ° C. for 2 hours was evaluated by the following evaluation method. The results are shown in Table 2.

[0041]Evaluation method Measurement of adhesive strength before UV irradiation  Adhesive sheet for liquid crystal display panel width 25mm, length 10
After cutting to 0 mm and releasing the release PET,
Bubble is formed on PC (polycarbonate) film
And push the 3kg roller back and forth 5 times.
Pressure contact, then left at room temperature for 20 minutes,
And heated at 120-130 ° C for 2 hours as a test piece.
did. The test piece was placed on an Instron 1175
(Manufactured by Ron Co., Ltd.) at a tensile speed of 300 mm / min.
Test was carried out. The results are shown in Table 2.

[0042]Measurement of adhesive strength after UV irradiation  Similar to the test piece used for measuring the adhesive strength after UV irradiation
A test piece was prepared, and polyethylene terephthalate was
Purple from main plate side at main wavelength 365μm, 120w / cm
The outside line was irradiated for 7 seconds. Then, install the test piece
Using a Ron 1175 type, at normal temperature, a tensile speed of 300 mm /
The peel test was performed in minutes. The results are shown in Table 2.

Example 2 An adhesive sheet for a liquid crystal display panel was produced in the same manner as in Example 1 except that the composition of the adhesive solution composition was changed to the composition shown in Table 1. The obtained adhesive sheet for a liquid crystal display panel was treated in the same manner as in Example 1, and evaluated using the same evaluation method as in Example 1. The results are shown in Table 2.

Comparative Example 1 An adhesive sheet for a liquid crystal display panel was prepared in the same manner as in Example 1 except that the composition of the adhesive solution composition was changed to the composition shown in Table 1. The obtained adhesive sheet for a liquid crystal display panel was treated in the same manner as in Example 1, and evaluated using the same evaluation method as in Example 1. The results are shown in Table 2.

Comparative Example 2 An adhesive sheet for a liquid crystal display panel was prepared in the same manner as in Example 1 except that the composition of the adhesive solution composition was changed to that shown in Table 1. The obtained adhesive sheet for a liquid crystal display panel was treated in the same manner as in Example 1, and evaluated using the same evaluation method as in Example 1. The results are shown in Table 2.

[0046]

[Table 1]

[0047]

[Table 2]

[0048]

Since the adhesive sheet for a liquid crystal display panel of the present invention has the above-mentioned structure, it can be used not only at room temperature but also at a high temperature of 120 to 130 ° C. When adhesive strength is required, it has a high adhesive strength with the translucent plastic film formed on it,
Even when a force is applied to the light-transmitting plastic film, no deviation or the like occurs, and when the light-transmitting plastic film needs to be peeled, it can be easily peeled.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are explanatory diagrams 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 15 Translucent plastic film layer 16 Translucent metal oxide electrode 17 Alignment film

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideo Kuroda 3-2-15 Meiwadori, Hyogo-ku, Kobe Bando Chemical Co., Ltd. F-term (reference) 2H088 FA10 FA16 FA17 FA18 FA29 HA12 HA18 MA20 2H090 HC19 JB03 LA09 LA15 4J004 AA01 AA02 AA04 AA05 AA10 AA11 AA12 AA13 AA14 AA15 AA17 AB01 CA02 CA04 CA05 CA06 CC02 DA03 DB02 FA01 FA05 FA08

Claims (3)

[Claims] 1. An adhesive sheet for a liquid crystal display panel capable of transmitting ultraviolet light used in a process of manufacturing a liquid crystal display panel, wherein the adhesive sheet for a liquid crystal display panel comprises:
The liquid crystal display panel is firmly fixed to the light-transmitting plastic film layer during manufacture, and can be easily separated from the light-transmitting plastic film layer by irradiating UV after the liquid crystal display panel is manufactured. Yes,
The adhesive sheet for a liquid crystal display panel is made of an elastic polymer 10
5 to 100 parts by weight of an ultraviolet-crosslinkable resin, 2 to 50 parts by weight of a tackifier, 0.1 to 10 parts by weight of a polymerization initiator, and 0.5 to 10 parts by weight of a crosslinking agent with respect to 0 parts by weight. And 1-20
An adhesive sheet for a liquid crystal display panel, comprising an adhesive layer comprising a weight part of a silicone resin. 2. The adhesive sheet for a liquid crystal display panel according to claim 1, wherein the silicone resin is added as a fine powder when preparing the pressure-sensitive adhesive layer. 3. The adhesive sheet for a liquid crystal display panel according to claim 1, wherein the silicone resin is soluble in an organic solvent.