KR102575111B1 - Separator-attached pressure-sensitive adhesive layer, optical film with separator-attached pressure-sensitive adhesive layer, image display device and method of producing the same - Google Patents

Abstract

(Problem) The present invention can prevent problems of a liquid crystal panel due to luminance non-uniformity due to a bright point by suppressing elution of an oligomer contained in a base film such as a polyester film used for a separator to an adhesive layer, and It aims at providing the adhesive layer with a separator which can suppress the white nonuniformity of a liquid crystal panel, and the optical film with an adhesive layer with a separator, even if it applies an RTP bonding process at the time of manufacture of a liquid crystal display device.
(Solution Means) An adhesive layer with a separator having a pressure-sensitive adhesive layer on a separator, the separator having a release layer on a base film, and an oligomer prevention layer and a conductive layer between the base film and the release layer, the pressure-sensitive adhesive The layer is formed on the release layer of the separator.

Description

Adhesive layer with separator, optical film with adhesive layer with separator, image display device and manufacturing method thereof PRODUCING THE SAME}

The present invention relates to a pressure-sensitive adhesive layer with a separator and an optical film with a pressure-sensitive adhesive layer with a separator. The present invention relates to an image display device in which the pressure-sensitive adhesive layer side of an optical film with a pressure-sensitive adhesive layer in a state in which a separator is peeled from the optical film with a pressure-sensitive adhesive layer with a separator is bonded to a display panel, and a method for manufacturing the same it's about

As said optical film, surface treatment films, such as a polarizing film, a retardation plate, an optical compensation film, a brightness improvement film, and an antireflection film, and also what these are laminated|stacked can be used. The optical film with a pressure-sensitive adhesive layer obtained by peeling the separator from the above-mentioned optical film with a pressure-sensitive adhesive layer with a separator is used for image display devices such as liquid crystal display devices, organic EL display devices, CRTs, and PDPs.

Optical films, such as a polarizing film, are used for image display devices, such as a liquid crystal display device. When sticking the said optical film to display panels, such as a liquid crystal panel, an adhesive is normally used. In general, an optical film with a pressure-sensitive adhesive layer formed in advance as a pressure-sensitive adhesive layer on one side of the optical film is used because it has advantages such as not requiring a drying step to adhere the optical film. In addition, the optical film with a pressure-sensitive adhesive layer is usually an optical film with a pressure-sensitive adhesive layer with a separator in which a separator (also referred to as a release film or a release liner) is formed on the surface of the pressure-sensitive adhesive layer for the purpose of protecting the pressure-sensitive adhesive layer before sticking. is manufactured as

Such an optical film with a pressure-sensitive adhesive layer with a separator may cause problems of the liquid crystal panel due to luminance non-uniformity due to a bright spot when an oligomer contained in a base film such as a polyester film used for a separator is eluted into the pressure-sensitive adhesive layer. Therefore, in Patent Document 1, forming an oligomer prevention layer on the separator is proposed.

Moreover, in manufacture of a liquid crystal display device, when peeling the separator of the optical film with a pressure-sensitive adhesive layer with a separator, static electricity (peeling electrification) is generated in the optical film with an adhesive layer and the separator. By bonding an optical film with an adhesive layer having static electricity to a liquid crystal panel, induced electrification occurs in the liquid crystal panel. The charge of this induced electrification affects the orientation of the liquid crystals of the liquid crystal panel, resulting in defects such as uneven image display. In addition, static electricity may cause problems such as occurrence of defective products due to adhesion or entrapment of foreign substances or the like in manufacturing sites.

Patent Literatures 2 to 4 propose a pressure-sensitive adhesive sheet having an antistatic function imparted to the pressure-sensitive adhesive layer by blending an ionic compound or a conductive polymer with the pressure-sensitive adhesive layer in order to suppress generation of static electricity. Further, Patent Literature 5 proposes a separator in which an antistatic function is imparted to the mold release layer of the separator.

Japanese Laid-open Patent Publication 2006-113600 Japanese Unexamined Patent Publication No. 6-128539 Japanese Patent Publication No. 2007-536427 Japanese Unexamined Patent Publication No. 2003-246874 Japanese Unexamined Patent Publication No. 2014-141557

However, even when the optical film with a pressure-sensitive adhesive layer with a separator using the separator of Patent Literature 5 is used, generation of static electricity at the time of separator peeling cannot be sufficiently suppressed. In particular, the liquid crystal display device is separated from the optical film with a pressure-sensitive adhesive layer with a separator by a release body (see Fig. 3) (at the same time as peeling), the optical film with an adhesive layer exposed after the separation of the separator. When manufacturing the pressure-sensitive adhesive layer side of the liquid crystal panel in the process of bonding (roll-to-panel (RTP) bonding process), by bonding the optical film with the pressure-sensitive adhesive layer having static electricity that is not attenuated to the liquid crystal panel, It was found that induction charging occurred. In the subsequent manufacturing process, a current (magnetic field) is generated in the liquid crystal panel when the inductively charged liquid crystal panel comes into contact with a dielectric such as a manufacturing machine, and the liquid crystal is misaligned, resulting in white non-uniformity (light leakage) ) occurs. Once white nonuniformity occurs in a liquid crystal panel, since white nonuniformity continues until the liquid crystal alignment returns to the original state, quality inspection in the manufacturing process becomes stagnant, resulting in a problem that production efficiency deteriorates.

The present invention suppresses the elution of oligomers contained in base films such as polyester films used for separators to the pressure-sensitive adhesive layer, thereby preventing problems in liquid crystal panels due to luminance non-uniformity due to bright spots, and also liquid crystal display devices. It aims at providing the adhesive layer with a separator which can suppress the white nonuniformity of a liquid crystal panel, and the optical film with an adhesive layer with a separator, even if it applies the said RTP bonding process at the time of manufacture.

In addition, the present invention is an image characterized in that the adhesive layer side of the optical film with an adhesive layer in a state in which the separator has been peeled from the optical film with an adhesive layer with a separator is bonded to at least one side of the display panel. It aims to provide a display device and a manufacturing method thereof.

As a result of repeated intensive studies to solve the above problems, the inventors of the present invention found the following pressure-sensitive adhesive layer with a separator, an optical film with a pressure-sensitive adhesive layer with a separator, an image display device, and a manufacturing method thereof, and completed the present invention. .

That is, the present invention is a pressure-sensitive adhesive layer with a separator having a pressure-sensitive adhesive layer on a separator, wherein the separator has a release layer on a base film, and an oligomer prevention layer and a conductive layer between the base film and the release layer, The pressure-sensitive adhesive layer relates to a pressure-sensitive adhesive layer with a separator characterized in that it is formed on the release layer of the separator.

In the pressure-sensitive adhesive layer with a separator of the present invention, it is preferable that the oligomer prevention layer is a layer formed of a composition containing a silica-based material and/or a polyvinyl alcohol-based resin.

It is preferable that the said conductive layer of the adhesive layer with a separator of this invention is a layer formed with the conductive composition containing a conductive polymer.

It is preferable that the surface resistance value of the said mold release layer of the adhesive layer with a separator of this invention is 1.0x10 ^<12> ohm/square or less.

It is preferable that the said adhesive layer of the adhesive layer with a separator of this invention is a layer formed from the adhesive composition containing a base polymer and a conductive compound.

It is preferable that the surface resistance value of the adhesive layer with a separator of this invention is 1.0x10 ^<12> ohm/square or less of the said adhesive layer.

The present invention relates to an optical film with a pressure-sensitive adhesive layer with a separator characterized in that the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer with a separator is bonded to at least one side of the optical film.

The present invention is an image display characterized in that the adhesive layer side of the optical film with an adhesive layer in a state in which the separator is peeled from the optical film with an adhesive layer with a separator is bonded to at least one surface of a display panel. It's about the device.

The present invention is a method for manufacturing the image display device, comprising: a roll preparation step of preparing a long sheet of an optical film with a separator-attached pressure-sensitive adhesive layer as a roll original; The display panel transport preparation step prepared by transporting, and the adhesive layer exposed after the separation of the separator while peeling the separator from the optical film with the adhesive layer with the separator drawn out from the roll raw material with a release body It is related with the manufacturing method of the image display apparatus characterized by including the bonding process of bonding the adhesive layer side of the affixed optical film to the said display panel conveyed to the said affixing position.

The pressure-sensitive adhesive layer with a separator of the present invention has a structure in which an oligomer prevention layer and a conductive layer are laminated between the base film of the separator and the release layer. The oligomer prevention layer is capable of suppressing elution of oligomers contained in a base film such as a polyester film of a separator to the pressure-sensitive adhesive layer, and is useful for preventing liquid crystal panel problems such as luminance unevenness due to bright spots.

In addition, since the separator has a conductive layer, the optical film with a pressure-sensitive adhesive layer of the present invention in which the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer with a separator is adhered to the optical film generates little static electricity during peeling of the separator. On the other hand, when a conductive agent such as a conductive compound is added to the oligomer prevention layer or release layer, the conductive agent and the conductive adhesive in the oligomer prevention layer or release layer may interact, thereby impairing the antistatic function. By laminating the prevention layer and the conductive layer, sufficient conductivity can be imparted to the surface of the separator.

In addition, the optical film with a pressure-sensitive adhesive layer with a separator of the present invention peels the separator from the optical film with a pressure-sensitive adhesive layer with a separator with a release body at the time of manufacturing a liquid crystal display device (at the same time as peeling), the separator Even when the step of bonding the pressure-sensitive adhesive layer side of the optical film with the pressure-sensitive adhesive layer exposed after peeling to the liquid crystal panel (RTP bonding process) is applied, since the separator has a conductive layer, generation of static electricity (peeling electrification) is suppressed. In addition, even if static electricity is generated by peeling the separator, the static electricity generated in the optical film with the pressure-sensitive adhesive layer can quickly move to the separated separator, so that the static electricity can be attenuated. It is useful for suppressing white unevenness of a panel.

1 is a schematic cross-sectional view showing a configuration example of an adhesive layer with a separator.
Fig. 2 is a schematic cross-sectional view showing a structural example of an optical film with a pressure-sensitive adhesive layer with a separator.
3 : is a schematic diagram explaining the RTP bonding process in the manufacturing method of an image display device.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail.

<Overall structure of the pressure-sensitive adhesive layer with a separator and the optical film with the pressure-sensitive adhesive layer with a separator attached>

A typical structural example of the pressure-sensitive adhesive layer with a separator of the present invention is schematically shown in Figs. 1(a) and (b). The pressure-sensitive adhesive layer 2 with a separator is an embodiment in which the pressure-sensitive adhesive layer 21 is formed on the release layer 12 of the separator 1 . Moreover, the separator 1 is an embodiment in which an oligomer prevention layer 13 and a conductive layer 14 are formed between the base film 11 and the release layer 12 . There is no restriction on the order in which the oligomer prevention layer 13 and the conductive layer 14 are laminated, but in the case of (a), since the oligomer prevention layer 13 is in contact with the base film 11, it is contained in a base material such as a polyester film. The effect of suppressing elution of the oligomer present in the pressure-sensitive adhesive layer is high, and since the conductive layer 14 is in contact with the mold release layer 12, the effect of suppressing white unevenness of the liquid crystal panel is high. In the case of (b), the elution inhibitory effect of the oligomer to the pressure-sensitive adhesive layer is high while maintaining the antistatic effect of the separator 1 as a whole. In addition, the laminate of the oligomer prevention layer 13 and the conductive layer 14 may be a multilayer of the oligomer prevention layer 13 and the conductive layer 14 .

A typical structural example of the optical film with a pressure-sensitive adhesive layer with a separator of the present invention is schematically shown in FIG. 2 . The optical film 3 with a pressure-sensitive adhesive layer with a separator is formed by bonding the optical film 31 to the pressure-sensitive adhesive layer 2 with a separator. The optical film 4 with an adhesive layer obtained by peeling the separator 1 from the optical film 3 with an adhesive layer with a separator is used by sticking the adhesive layer 21 on a display panel as an adherend.

<Adhesive layer with separator>

The adhesive layer with a separator of this invention has a structure which has an adhesive layer on a separator. The separator has an oligomer prevention layer and a conductive layer between the base film and the release layer.

<Base film>

As the base film for the separator of the present invention, a plastic film can be used. As a plastic film, Polyolefin films, such as a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, and a polymethylpentene film, Polyvinyl chloride film, Vinyl chloride type film, such as a vinyl chloride copolymer film; Polyester films, such as a polyethylene terephthalate film, a polybutylene terephthalate film, and a polynaphthylene terephthalate film; In addition, a polyurethane film, an ethylene-vinyl acetate copolymer film, etc. are mentioned. In the present invention, for the purpose of preventing elution of the oligomer in the base film, it is preferable to use a polyester film among the base films.

The thickness of the base film is usually 5 to 200 μm, preferably 5 to 100 μm. The base film may be subjected to surface treatment such as corona treatment and plasma treatment in advance in the formation of the oligomer prevention layer and the conductive layer.

<Oligomer prevention layer>

The oligomer prevention layer of the present invention can be formed from an appropriate material for preventing elution of oligomer contained in a base film such as a polyester film to the pressure-sensitive adhesive layer. As the material for forming the oligomer prevention layer, an inorganic substance, an organic substance, or a composite material thereof can be used. As the inorganic material, a silica-based material or a metal made of gold, silver, platinum, palladium, copper, aluminum, nickel, chromium, titanium, iron, cobalt, or tin or an alloy thereof, or indium oxide, tin oxide, or titanium oxide , metal oxides composed of cadmium oxide or mixtures thereof, other metal compounds composed of steel iodide, and the like. Examples of organic materials include polyvinyl alcohol-based resins, acrylic resins, urethane-based resins, melamine-based resins, UV curable resins, and epoxy-based resins. Moreover, as a composite material, the mixture of the said organic substance and inorganic particles, such as an alumina, a silica, and mica, is mentioned.

The oligomer prevention layer is preferably formed of a composition containing a silica-based material or a polyvinyl alcohol-based resin.

<Silica-based material>

As said silica type material, the organosiloxane represented by the following general formula (I) is mentioned, for example.

[Formula 1]

In the above general formula (I), R ¹ and R ² are each independently an organic group containing an epoxy group such as a γ-glycidoxypropyl group and a 3,4-epoxycyclohexylethyl group, or a methoxy group and an ethoxy group. It is an alkoxy group, and R ³ is an alkoxy group such as a methoxy group or an ethoxy group, or a group represented by the following general formula (II). n and m are integers from 0 to 10;

[Formula 2]

In the general formula (II), R ⁴ is an organic group containing an epoxy group or an alkoxy group identical to the R ¹ group or the R ² group.

Specific examples of the organosiloxane include γ-glycidoxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyl monomers such as triethoxysilane, 5,6-epoxycyclohexyltriethoxysilane, and tetraethoxysilane, and hydrolyzable products (oligomers) of these monomers or mixtures of these monomers are exemplified.

Moreover, as said silica type material, the silane compound which has an amino group is mentioned. As the silane compound having the amino group, an alkoxysilane represented by the following general formula (III) is preferable.

YR-Si-(X) ₃ . . . … (III)

(In the above general formula (III), Y represents an amino group, R represents an alkylene group such as methylene, ethylene, or propylene, X represents an alkoxy group such as a methoxy group or an ethoxy group, an alkyl group, or an organic functional group having these groups, and at least 1 more than one is an alkoxy group).

Specific examples of the silane compound having the amino group include N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropyltriethoxysilane, N-β (aminoethyl ) γ-aminopropylmethyldimethoxysilane, γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, and the like.

In addition, as the silica-based material, (meth)acryl group-containing silane compounds such as 3-acryloxypropyltrimethoxysilane and 3-methacryloxypropyltriethoxysilane, 3-isocyanatepropyltriethoxysilane, and the like Isocyanate group-containing silane compounds of

Specific products of the silica-based material include KR-401N, X-40-9227, X-40-9247, KR-510, KR-9218, KR-213, KR-217, and X-41 manufactured by Shin-Etsu Chemical Co., Ltd. -1053, X-40-1056, X-41-1805, X-41-1810, X-40-2651, X-40-2652B, X-40-2655A, X-40-2761, X-40-2672 etc. can be mentioned.

As for the said silica type material, only 1 type may be used, and 2 or more types may be used.

An organic compound having a metal element (metal compound such as a metal chelate), a catalyst, and the like may be contained in the oligomer prevention layer formed of the silica-based material, if necessary. As for the metal organic compound which has a metal element, only 1 type may be used, and 2 or more types may be used.

Among the metal organic compounds containing the above-mentioned metal elements, organic compounds containing an aluminum element having a chelate structure, organic compounds containing a titanium element, and organic compounds containing a zirconium element having a chelate structure are preferable because the oligomer elution prevention performance is particularly good. These compounds are specifically described in "Crosslinking Agent Handbook" (Yamashita Shinzo, edited by Tosuke Kaneko, Taisei Co., Ltd., 1990 edition).

The formation of the oligomer prevention layer formed of the silica-based material can be performed by applying a solution in which the silica-based material is dissolved in a solvent such as alcohol to a base film or conductive layer and then drying. The concentration of the solution in which the silica-based material is dissolved is not particularly limited, but is preferably about 0.1 to 40% by weight. The drying temperature after application is not particularly limited, but is preferably about 100 to 150°C. In addition, the drying time after application is not particularly limited, but is preferably about 30 seconds to 30 minutes.

<Composition containing polyvinyl alcohol-based resin>

As said polyvinyl alcohol-type resin, polyvinyl alcohol or its derivative(s) is mentioned. Examples of polyvinyl alcohol derivatives include polyvinyl formal and polyvinyl acetal, as well as olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid, and alkyl esters thereof; What was modified|denatured with acrylamide etc. is mentioned. As for polyvinyl alcohol-type resin, only 1 type may be used and 2 or more types may be used.

The degree of polymerization of the polyvinyl alcohol-based resin is not particularly limited, but is usually 100 or more, preferably 300 to 40000. On the other hand, the degree of saponification of the polyvinyl alcohol-based resin is not particularly limited, but is preferably 70 mol% or more, preferably 80 mol% or more and 99.9 mol% or less.

A binder polymer may be contained in the composition containing the polyvinyl alcohol-based resin. As the binder polymer, polyacrylamide, polyalkylene glycol, polyalkyleneimine, methylcellulose, hydroxycellulose, starch, polyurethane, polyester, polyacrylate, chlorine-based polymer (polyvinyl chloride, vinyl chloride vinyl acetate copolymer, etc.), polyolefin, etc. are mentioned. Among them, organic polymers that can be used as nonionic, cationic, or amphoteric aqueous solutions or aqueous dispersions are exemplified when the oligomer prevention layer is coated and formed by a coating and stretching method, and among them, polyurethane and polyester. , When polyacrylate is used, adhesiveness becomes good. These polymers are imparted with hydrophilicity and can be dispersed in water by copolymerizing a nonionic, cationic, or amphoteric hydrophilic component as one component of the monomer.

A crosslinking agent may be contained in the composition containing the polyvinyl alcohol-based resin. As the crosslinking agent, a methylolized or alkylolized urea-based, melamine-based, guanamine-based, acrylamide-based, polyamide-based compound, epoxy compound, aziridine compound, blocked polyisocyanate, silane coupling agent, titanium coupling agent, zirco -Aluminate coupling agent etc. are mentioned. These crosslinking components may be previously bonded to the binder polymer.

The composition containing the polyvinyl alcohol-based resin may contain inorganic particles for the purpose of improving the adhesion and sliding properties of the oligomer prevention layer. Examples of the inorganic particles include silica, alumina, kaolin, calcium carbonate, titanium oxide, and barium salt.

Formation of the oligomer prevention layer may be performed by applying a solution obtained by dissolving the composition containing the polyvinyl alcohol-based resin in a solvent such as water or alcohol to a base film or an oligomer prevention layer and then drying it. Moreover, you may extend|stretch at the time of drying. The concentration of the solution in which the composition containing the polyvinyl alcohol-based resin is dissolved is not particularly limited, but is preferably about 0.1 to 40% by weight. The drying temperature after application is not particularly limited, but is preferably about 60 to 200°C. In addition, the drying time after application is not particularly limited, but is preferably about 3 to 60 seconds. If necessary, heat treatment and active energy ray irradiation such as ultraviolet irradiation may be used in combination.

The content of the polyvinyl alcohol-based resin in the oligomer prevention layer is not particularly limited, but is preferably 10 to 100% by weight, more preferably 20 to 90% by weight, and most preferably 30 to 80% by weight. is good

The method for forming the oligomer prevention layer is not particularly limited, and may be appropriately selected according to the forming material, and a coating method, spray method, spin coating method, in-line coating method, or the like is used. Moreover, a vacuum deposition method, a sputtering method, an ion plating method, a spray pyrolysis method, a chemical plating method, an electroplating method, etc. can also be used.

The thickness of the oligomer prevention layer is preferably set appropriately in the range of 5 to 100 nm, more preferably 10 to 70 nm.

<Conductive layer>

The conductive layer of the present invention can suppress generation of static electricity due to separation of the separator, and even if static electricity is generated due to separation of the separator, the electric charge of static electricity generated in the optical film with the pressure-sensitive adhesive layer is quickly separated. Since it can migrate to the separator, it is possible to prevent non-uniform whiteness of the liquid crystal panel. The conductive layer is not particularly limited as long as it is a conductive layer, but a conductive composition containing a conductive polymer, a conductive composition containing an ionic surfactant such as anionic surfactant, cationic surfactant, tin oxide, antimony oxide, and a layer formed of a conductive composition containing a metal oxide such as indium oxide or zinc oxide. The conductive layer is preferably a layer formed of a conductive composition containing a conductive polymer from the viewpoint of easiness to obtain a separator having a desired surface resistance value of the release layer.

Examples of the conductive polymer include polyaniline, polypyrrole, polythiophene, poly(ethylenedioxythiophene) (abbreviated as PEDOT), and poly(ethylenedioxythiophene)/polystyrene sulfonate (abbreviated as PEDOT/PSS). In particular, poly(ethylenedioxythiophene)/polystyrene sulfonate (abbreviated abbreviation PEDOT/PSS) is preferable from the viewpoint of antistatic properties and transparency. As for the conductive polymer, only one type may be used, or two or more types may be used.

A binder resin may be contained in the conductive composition containing the conductive polymer. Examples of binder resins include polyvinyl alcohol resins, polyester resins, polyurethane resins, acrylic resins, vinyl resins, epoxy resins, and amide resins.

The weight ratio of the conductive polymer to the binder resin (conductive polymer: binder resin) is preferably from 50:1 to 1:1, more preferably from 20:1 to 2:1, and more preferably from 15:1 to 5:1 desirable.

The formation of the conductive layer may be performed by applying a solution obtained by dissolving the conductive composition containing the conductive polymer in a solvent such as water or alcohol to a base film or an oligomer prevention layer and then drying the solution. The concentration of the solution in which the conductive composition containing the conductive polymer is dissolved is not particularly limited, but is preferably about 0.1 to 40% by weight. The drying temperature after application is not particularly limited, but is preferably about 100 to 150°C. In addition, the drying time after application is not particularly limited, but is preferably about 1 to 60 minutes.

The method of forming the conductive layer is not particularly limited, and a coating method, a spray method, a spin coating method, an in-line coating method and the like are used.

The thickness of the conductive layer is preferably 1 nm to 500 nm, more preferably 10 nm to 200 nm, still more preferably 20 nm to 100 nm.

<release layer>

On the oligomer prevention layer and the conductive layer of the present invention, a release layer is then formed. A release layer is formed in order to improve peelability from an adhesive layer. The material for forming the release layer is not particularly limited, and examples thereof include silicone-based, fluorine-based, long-chain alkyl-based, or fatty acid amide-based release agents. Among these, a silicone type release agent is preferable. The release layer can be formed as an application layer on the oligomer prevention layer and the conductive layer. Moreover, a mold release layer can be formed also by electrodeposition.

As said silicone type release agent, addition reaction type silicone resin is mentioned, for example. Examples of the addition reaction type silicone resin include KS-774, KS-775, KS-778, KS-779H, KS-847H, KS-847T manufactured by Shin-Etsu Chemical Co., Ltd., TPR-6700, TPR-6710, and TPR manufactured by Toshiba Silicone. -6721, Toray Dow Corning SD7220, SD7226, etc. are mentioned.

The application amount of the silicone-based release layer (after drying) is preferably in the range of 0.01 to 2 g/m 2 , more preferably in the range of 0.01 to 1 g/m 2 , still more preferably in the range of 0.01 to 0.5 g/m 2 .

Formation of the release layer is, for example, after applying the above material on the functional layer by a conventionally known coating method such as reverse gravure coat, bar coat, die coat, etc., usually at 120 to 200 ° C. It can be carried out by curing by performing a heat treatment for about 30 seconds to 30 minutes. Moreover, you may use together heat treatment and active energy ray irradiation, such as ultraviolet irradiation, as needed.

The thickness of the release layer is usually 10 to 2000 nm, preferably 10 to 1000 nm, more preferably 10 to 500 nm.

The surface resistance value of the release layer is preferably 1.0 × 10 ¹² Ω/□ or less, and more preferably 1.0 × 10 ¹¹ Ω/□ or less, from the viewpoint of imparting conductivity to the separator and suppressing uneven whiteness of the liquid crystal panel. and more preferably 1.0 × 10 ¹⁰ Ω/□ or less.

<Adhesive layer>

The pressure-sensitive adhesive layer of the present invention is formed from a pressure-sensitive adhesive composition. As the pressure-sensitive adhesive composition, a rubber-based pressure-sensitive adhesive composition, an acrylic pressure-sensitive adhesive composition, a silicone-based pressure-sensitive adhesive composition, a urethane-based pressure-sensitive adhesive composition, a vinylalkyl ether-based pressure-sensitive adhesive composition, a polyvinyl alcohol-based pressure-sensitive adhesive composition, a polyvinylpyrrolidone-based pressure-sensitive adhesive composition, a polyacrylamide-based pressure-sensitive adhesive composition, A cellulosic adhesive composition etc. are mentioned. It is preferable to contain a base polymer in an adhesive composition.

<Base polymer>

As the base polymer, an adhesive base polymer is selected according to the type of the pressure-sensitive adhesive composition.

Among the above pressure-sensitive adhesive compositions, an acrylic pressure-sensitive adhesive composition is preferably used because of its excellent optical transparency, appropriate adhesive properties such as wettability, cohesiveness and adhesiveness, and excellent weather resistance and heat resistance. The acrylic pressure-sensitive adhesive composition preferably contains a (meth)acrylic polymer as an adhesive base polymer. A (meth)acrylic polymer usually contains an alkyl (meth)acrylate as a main component as a monomer unit. Incidentally, (meth)acrylate refers to acrylate and/or methacrylate, and has the same meaning as (meth) of the present invention.

Examples of the alkyl (meth)acrylate constituting the main skeleton of the (meth)acrylic polymer include linear or branched alkyl groups having 1 to 18 carbon atoms. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, an amyl group, a hexyl group, a cyclohexyl group, a heptyl group, a 2-ethylhexyl group, an isooctyl group, a nonyl group, and a decyl group , isodecyl group, dodecyl group, isomyristyl group, lauryl group, tridecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group and the like can be exemplified. Alkyl (meth)acrylate may use only 1 type, and may use 2 or more types. It is preferable that the average carbon number of these alkyl groups is 3-9.

Moreover, as said alkyl (meth)acrylate, it contains aromatic rings like phenoxyethyl (meth)acrylate and benzyl (meth)acrylate from the point of adhesive property, durability, adjustment of phase difference, adjustment of refractive index, etc. Alkyl (meth) acrylates may be used.

Among the (meth)acrylic polymers, for the purpose of improving adhesion and heat resistance, at least one type of copolymerization monomer having a polymerizable functional group having an unsaturated double bond such as a (meth)acryloyl group or a vinyl group may be introduced by copolymerization. can Specific examples of the copolymerization monomer include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, (meth)acrylate ) Hydroxyl group-containing monomers such as 8-hydroxyoctyl acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methyl acrylate; Carboxyl group-containing monomers, such as (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid; acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; Contains sulfonic acid groups such as styrenesulfonic acid, allylsulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamidepropanesulfonic acid, sulfopropyl(meth)acrylate, and (meth)acryloyloxynaphthalenesulfonic acid monomer; Phosphoric acid group containing monomers, such as 2-hydroxyethyl acryloyl phosphate, etc. are mentioned.

The (meth)acrylic polymer has an alkyl (meth)acrylate as a main component in the weight ratio of all monomers, and the ratio of the copolymerized monomer in the (meth)acrylic polymer is not particularly limited. The ratio is preferably about 0 to 20%, about 0.1 to 15%, and more preferably about 0.1 to 10% in terms of the weight ratio of all constituent monomers.

As for the (meth)acrylic polymer, a weight average molecular weight (Mw) in the range of 500,000 to 3,000,000 is usually used. Considering durability, particularly heat resistance, the weight average molecular weight (Mw) is preferably 700,000 to 2.7 million, more preferably 800,000 to 2,500,000. When the weight average molecular weight (Mw) is smaller than 500,000, it is not preferable from the viewpoint of heat resistance. In addition, when the weight average molecular weight (Mw) is larger than 3,000,000, a large amount of diluting solvent is required to adjust the viscosity for coating, which is not preferable because the cost increases. In addition, a weight average molecular weight (Mw) means the value calculated by measuring by GPC (gel permeation chromatography) and calculated by polystyrene conversion.

For the production of the (meth)acrylic polymer, known production methods such as solution polymerization, bulk polymerization, emulsion polymerization, and various radical polymerization can be appropriately selected. Moreover, any of a random copolymer, a block copolymer, a graft copolymer, etc. may be sufficient as the obtained (meth)acrylic polymer.

The polymerization initiator, chain transfer agent, emulsifier, etc. used in the radical polymerization are not particularly limited and may be appropriately selected and used. In addition, the weight average molecular weight (Mw) of the (meth)acrylic polymer can be controlled depending on the amount of polymerization initiator and chain transfer agent used and reaction conditions, and the amount used is appropriately adjusted according to these types.

In addition, in the said solution polymerization, ethyl acetate, toluene, etc. are used as a polymerization solvent. As a specific example of solution polymerization, the reaction is carried out under an inert gas stream such as nitrogen, adding a polymerization initiator, and usually under reaction conditions at about 50 to 70°C for about 5 to 30 hours.

<Conductive Compound>

It is preferable that the adhesive composition of this invention contains a conductive compound in addition to the said base polymer. Examples of the conductive compound include ionic compounds, ionic surfactants, conductive polymers, and metal oxides.

As the ionic compound, an alkali metal salt and/or an organic cation-anion salt can be preferably used. As the alkali metal salt, organic salts and inorganic salts of alkali metals can be used. In addition, the "organic cation-anion salt" as used in the present invention is an organic salt, and indicates that the cation portion is composed of an organic substance, and the anion portion may be an organic substance or an inorganic substance. The "organic cation-anion salt" is also referred to as an ionic liquid or an ionic solid. As for an ionic compound, only 1 type may be used and 2 or more types may be used.

Examples of the alkali metal ion constituting the cation portion of the alkali metal salt include ions of lithium, sodium, and potassium. Among these alkali metal ions, lithium ion is preferable.

The anion portion of the alkali metal salt may be composed of an organic substance or may be composed of an inorganic substance. Examples of the anion component constituting the organic salt include CH ₃ COO ^- , CF ₃ COO ^- , CH ₃ SO ₃ ^- , CF ₃ SO ₃ ^- , (CF ₃ SO ₂ ) ₃ C ^- , C ₄ F ₉ SO ₃ ^- , C ₃ F ₇ COO ^- , (CF ₃ SO ₂ )(CF ₃ CO)N ^- , ^- O ₃ S(CF ₂ ) ₃ SO ₃ ^- , PF ₆ ^- , CO ₃ ^2- B Formulas (1) to (4),

(1): (C _n F _2n+1 SO ₂ ) ₂ N ^- (where n is an integer from 1 to 10),

(2): CF ₂ (C _m F _2m SO ₂ ) ₂ N ^- (where m is an integer from 1 to 10),

(3): ^- O ₃ S(CF ₂ ) _l SO ₃ ^- (provided that l is an integer from 1 to 10);

(4): (C _p F _{2p + 1} SO ₂ ) N ^- (C _q F _{2q + 1} SO ₂ ), (provided that p and q are integers of 1 to 10), and the like are used. In particular, an anionic moiety containing a fluorine atom is preferably used because an ionic compound having good ionic dissociation properties is obtained. Examples of the anion component constituting the inorganic salt include Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , BF ₄ ^- , PF ₆ ^- , ClO ₄ ^- , NO ₃ ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , TaF ₆ ^- , (CN) ₂ N ^- and the like are used. As the anion moiety, a (perfluoroalkylsulfonyl)imide represented by the above general formula (1), such as (CF ₃ SO ₂ ) ₂ N ^- , (C ₂ F ₅ SO ₂ ) ₂ N ^- , is preferable, and particularly The (trifluoromethanesulfonyl)imide represented by (CF ₃ SO ₂ ) ₂ N ^- is preferred.

Examples of alkali metal organic salts include sodium acetate, sodium alginate, sodium ligninsulfonate, sodium toluenesulfonate, LiCF ₃ SO ₃ , Li(CF ₃ SO ₂ ) ₂ N, Li(CF ₃ SO ₂ ) ₂ N , Li(C ₂ F ₅ SO ₂ ) ₂ N, Li(C ₄ F ₉ SO ₂ ) ₂ N, Li(CF ₃ SO ₂ ) ₃ C, KO ₃ S(CF ₂ ) ₃ SO ₃ K, LiO ₃ S (CF ₂ ) ₃ SO ₃ K and the like, among which LiCF ₃ SO ₃ , Li(CF ₃ SO ₂ ) ₂ N, Li(C ₂ F ₅ SO ₂ ) ₂ N, Li(C ₄ F ₉ SO ₂ ) ₂ N, Li(CF ₃ SO ₂ ) ₃ C, etc. are preferable, Li(CF ₃ SO ₂ ) ₂ N, Li(C ₂ F ₅ SO ₂ ) ₂ N, Li(C ₄ F ₉ SO ₂ ) A fluorine-containing lithium imide salt such as _2N is more preferable, and a (perfluoroalkylsulfonyl)imilithium salt is particularly preferable.

Moreover, as an inorganic salt of an alkali metal, lithium perchlorate and lithium iodide are mentioned.

The organic cation-anion salt is composed of a cation component and an anion component, and the cation component is composed of an organic substance. Specifically as the cation component, pyridinium cation, piperidinium cation, pyrrolidinium cation, cation having a pyrroline skeleton, cation having a pyrrole skeleton, imidazolium cation, tetrahydropyrimidi and the like.

As the anionic component, Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , BF ₄ ^- , PF ₆ ^- , ClO ₄ ^- , NO ₃ ^- , CH ₃ COO ^- , CF ₃ COO ^- , CH ₃ SO ₃ ^- , CF ₃ SO ₃ ^- , (CF ₃ SO ₂ ) ₃ C ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , TaF ₆ ^- , (CN) ₂ N ^- , C ₄ F ₉ SO ₃ ^- , C ₃ F ₇ COO ^- , ((CF ₃ SO ₂ )(CF ₃ CO)N ^- , ^- O ₃ S(CF ₂ ) ₃ SO ₃ ^- or the following general formulas (1) to (4) ,

(1): (C _n F _2n+1 SO ₂ ) ₂ N ^- (where n is an integer from 1 to 10),

(2): CF ₂ (C _m F _2m SO ₂ ) ₂ N ^- (where m is an integer from 1 to 10),

(3): ^- O ₃ S(CF ₂ ) _l SO ₃ ^- (provided that l is an integer from 1 to 10);

(4): (C _p F _{2p + 1} SO ₂ ) N ^- (C _q F _{2q + 1} SO ₂ ), (provided that p and q are integers of 1 to 10), and the like are used. Among them, an anionic component containing a fluorine atom is preferably used because an ionic compound having good ionic dissociation properties is obtained.

Moreover, as said ionic compound, inorganic salts, such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride, and ammonium sulfate, besides the said alkali metal salt and organic cation-anion salt, are mentioned. there is.

Examples of the ionic surfactant include cationic surfactants (quaternary ammonium salt type, phosphonium salt type, sulfonium salt type, etc.), anionic types (carboxylic acid type, sulfonate type, sulfate type, phosphate type, phosphite type, etc.), Zwitterionic (sulfobetaine type, alkylbetaine type, alkylimidazolium betaine type, etc.) or nonionic type (polyhydric alcohol derivative, β-cyclodextrin clathrate compound, sorbitan fatty acid monoester/diester, polyalkylene oxide derivatives, amine oxides, etc.) and various surfactants. As for ionic surfactant, only 1 type may be used and 2 or more types may be used.

Examples of the conductive polymer include polymers such as polyaniline, polythiophene, polypyrrole, and polyquinoxaline. Among these, polyaniline, polythiophene, etc. preferably used. Polythiophene is particularly preferred. As for the conductive polymer, only 1 type may be used, and 2 or more types may be used.

Examples of the metal oxide include tin oxide, antimony oxide, indium oxide, and zinc oxide. Among these, a tin oxide system is preferable. Examples of tin oxide-based ones include antimony-doped tin oxide, indium-doped tin oxide, aluminum-doped tin oxide, tungsten-doped tin oxide, titanium oxide-cerium oxide-tin oxide composites, and titanium oxide-oxide in addition to tin oxide. complexes of tin; and the like. As for a metal oxide, only 1 type may be used and 2 or more types may be used.

In addition, as the conductive compound other than the above, acetylene black, Ketjen black, natural graphite, artificial graphite, titanium black, cationic type (quaternary ammonium salt, etc.), zwitterion type (betaine compound, etc.), anionic type (sulfonic acid salt, etc.) ) or a homopolymer of a monomer having an ionic conductive group of nonionic type (such as glycerin), a copolymer of the monomer and another monomer, or a polymer having a site derived from acrylate or methacrylate having a quaternary ammonium base group having ionic conductivity A polymer having; A permanent antistatic agent of a type obtained by alloying a hydrophilic polymer such as a polyethylene methacrylate copolymer with an acrylic resin or the like can be exemplified.

The conductive compound is preferably an ionic compound from the viewpoints of high conductivity, excellent dispersibility and transparency in the pressure-sensitive adhesive, and storage stability in the pressure-sensitive adhesive.

The mixing ratio of the conductive compound is preferably 0.0001 to 5 parts by weight based on 100 parts by weight of the base polymer. If the amount of the conductive compound is less than 0.0001 part by weight, the effect of improving the antistatic performance may not be sufficient. On the other hand, when the conductive compound is more than 5 parts by weight, durability may not be sufficient. The content of the conductive compound is preferably 0.01 part by weight or more, and more preferably 0.1 part by weight or more. Further, the amount of the conductive compound is preferably 3 parts by weight or less, and more preferably 2 parts by weight or less.

Moreover, a crosslinking agent can be contained in the adhesive composition of this invention. As the crosslinking agent, an organic type crosslinking agent or a polyfunctional metal chelate can be used. Examples of the organic crosslinking agent include isocyanate crosslinking agents, peroxide crosslinking agents, epoxy crosslinking agents, and imine crosslinking agents. A polyfunctional metal chelate is one in which a multivalent metal is bonded covalently or coordinately to an organic compound. Examples of the multivalent metal atom include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, and the like. there is. Examples of atoms in organic compounds that form a covalent bond or coordinate bond include oxygen atoms, and examples of organic compounds include alkyl esters, alcohol compounds, carboxylic acid compounds, ether compounds, and ketone compounds. As a crosslinking agent, an isocyanate type crosslinking agent and a peroxide type crosslinking agent are preferable. As for a crosslinking agent, only 1 type may be used and 2 or more types may be used.

The blending ratio of the crosslinking agent is preferably from 0.01 to 20 parts by weight, more preferably from 0.03 to 10 parts by weight, based on 100 parts by weight of the base polymer. In addition, if the crosslinking agent is less than 0.01 parts by weight, the cohesive force of the pressure-sensitive adhesive tends to be insufficient, and there is a risk of foaming during heating. easier to occur

Moreover, a silane coupling agent can be contained in the adhesive composition of this invention. Durability can be improved by using a silane coupling agent. As for a silane coupling agent, only 1 type may be used and 2 or more types may be used.

The blending ratio of the silane coupling agent is preferably 0.001 to 5 parts by weight, more preferably 0.01 to 1 part by weight, still more preferably 0.02 to 1 part by weight, and 0.05 to 0.6 parts by weight with respect to 100 parts by weight of the base polymer. Addition is particularly preferred. It is appropriately selected within this range in order to improve durability and properly maintain the adhesive strength to optical members such as liquid crystal panels.

In addition, the pressure-sensitive adhesive composition of the present invention may contain other known additives, colorants, powders such as pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents , light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particulates, thin materials and the like can be added as appropriate depending on the use. Further, within a controllable range, a redox system to which a reducing agent is added may be employed.

The pressure-sensitive adhesive layer with a separator of the present invention can be produced by applying a solution containing the pressure-sensitive adhesive composition onto the release layer of the separator, followed by drying to form a pressure-sensitive adhesive layer. In addition, in application|coating of an adhesive composition, you may add 1 or more types of solvents other than a polymerization solvent newly as appropriate.

As a method of applying the pressure-sensitive adhesive composition, various methods are used. Specifically, roll coating, kiss roll coating, gravure coating, reverse coating, roll brush, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip coating, extrusion coating by die coater, etc. and the like.

The thickness of the pressure-sensitive adhesive layer is not particularly limited and is about 1 to 100 μm. Preferably it is 2-50 micrometers, More preferably, it is 2-40 micrometers, More preferably, it is 5-35 micrometers.

The surface resistance value of the pressure-sensitive adhesive layer is preferably 1.0 × 10 ¹² Ω/□ or less, and 1.0 × 10 ¹¹ Ω/□ or less, from the viewpoint of imparting conductivity to the pressure-sensitive adhesive layer with a separator and suppressing white unevenness of the liquid crystal panel. It is more preferable, and it is still more preferable that it is 1.0 × 10 ¹⁰ Ω/□ or less.

<Optical film with pressure-sensitive adhesive layer with separator>

As for the optical film with a pressure-sensitive adhesive layer of the present invention, the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer with a separator is bonded to at least one side of the optical film.

As the optical film, one used for forming an image display device such as a liquid crystal display device can be used, and the type is not particularly limited. As an optical film, surface treatment films, such as a polarizing film, a retardation plate, an optical compensation film, a brightness improvement film, and an antireflection film, Furthermore, what these are laminated|stacked, etc. are mentioned.

As for the said polarizing film, what has a transparent protective film on one side or both sides of a polarizer is generally used. A polarizer is not specifically limited, Various things can be used. As a polarizer, a dichroic substance such as iodine or a dichroic dye is adsorbed on a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, an ethylene-vinyl acetate copolymer-based partially saponified film, and the like, and uniaxial stretching polyene-based oriented films such as polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products; and the like. Among these, a polarizer composed of a polyvinyl alcohol-based film and a dichroic substance such as iodine is preferable. The thickness of these polarizers is not particularly limited, but is generally about 80 μm or less.

In addition, a thin polarizer having a thickness of 10 μm or less may be used as the polarizer. From the viewpoint of thinning, the thickness is preferably from 1 to 7 μm. Since such a thin polarizer has little thickness nonuniformity, excellent visibility, and little dimensional change, it is excellent in durability, and also the thickness as a polarizing film is also preferably reduced in thickness.

As a material constituting the transparent protective film, a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, water barrier properties, isotropy, and the like is used. Specific examples of such a thermoplastic resin include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, and (meth)acrylic resins. resins, cyclic polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. In addition, a transparent protective film is bonded to one side of the polarizer by an adhesive layer, but to the other side, as a transparent protective film, a (meth)acrylic, urethane-based, acrylurethane-based, epoxy-based, silicone-based thermosetting resin or ultraviolet curable resin is used. can be used One or more types of arbitrary appropriate additives may be contained in the transparent protective film.

The adhesive used for bonding the polarizer and the transparent protective film is not particularly limited as long as it is optically transparent, and various types of adhesives such as water-based, solvent-based, hot-melt-based, radical curable, and cation-curable adhesives are used, but water-based adhesives or radical curable adhesives Adhesives are preferred.

<Image Display Device>

In the image display device of the present invention, the pressure-sensitive adhesive layer side of the optical film with a pressure-sensitive adhesive layer in a state in which the separator is peeled is bonded to at least one side of the display panel from the optical film with a pressure-sensitive adhesive layer with a separator. As a display panel, a liquid crystal panel etc. are mentioned. As the liquid crystal panel, any type such as TN type, STN type, π type, VA type, or IPS type can be used.

<Method of manufacturing image display device>

The method for manufacturing an image display device of the present invention includes a roll preparation step of preparing a long sheet of an optical film with a separator-attached pressure-sensitive adhesive layer as a roll raw material, and a display panel conveyance preparation step of preparing a display panel by conveying it to the sticking position. And, while peeling the separator from the optical film with a pressure-sensitive adhesive layer with a separator drawn out from the roll fabric with a release body, the pressure-sensitive adhesive layer side of the optical film with an adhesive layer exposed after peeling of the separator is at the sticking position It is a manufacturing method including the bonding process (RTP bonding process) of bonding to the said display panel conveyed to .

<Roll fabric preparation process>

The roll fabric preparation step is a step of manufacturing an optical film with a pressure-sensitive adhesive layer with a separator as a roll fabric of a long (strip) sheet, and the roll fabric can be manufactured according to the conventional method without particular limitation.

<Display panel transport preparation process>

The said display panel conveyance preparation process is a process of conveying display panels, such as a liquid crystal panel, to an affixing position, There is no restriction|limiting in particular in the conveyance method, It can convey according to the prior art.

<RTP bonding process>

A typical schematic diagram of the RTP bonding process is shown in FIG. 3 . The long sheet of the optical film 3 with a pressure-sensitive adhesive layer with a separator drawn out from the roll fabric is separated from the optical film 3 with a pressure-sensitive adhesive layer with a separator just before being conveyed to the sticking position 101. ) is peeled by the peeling body 100. The adhesive layer 21 of the optical film 4 with the adhesive layer exposed after peeling of the separator 1 is guided to the bonding predetermined position 101 by the receiving roller 102 to the display panel 5, It is bonded by the sticking roller 103, and an image display apparatus is manufactured.

In the RTP bonding step, since the optical film 3 with a pressure-sensitive adhesive layer with a separator is a long sheet that has not been cut, even after separation of the separator 1, the optical film with a pressure-sensitive adhesive layer in the form of a long sheet (4 ) (or the pressure-sensitive adhesive layer 21) remains in contact with the separator 1 before peeling. Therefore, even if static electricity is generated on the long-sheet-shaped optical film 4 (or the pressure-sensitive adhesive layer 21) with the adhesive layer due to the separation of the separator 1, the electric charge of the static electricity will destroy the separator 1 before the separation. Since it can move to the separator 1 after peeling quickly through an intermediary, as a result of the separator 1 after the said peeling fulfills a responsibility of earthing, the electric charge of static electricity is attenuated.

In addition, in the manufacturing method of the image display device, after the display panel and the optical film with the pressure-sensitive adhesive layer are bonded, as necessary, component parts such as a lighting system are appropriately assembled, and a drive circuit is mounted. For example, a liquid crystal display device manufacturing method in which an optical film with an adhesive layer is disposed on one side or both sides of a display panel such as a liquid crystal panel, a liquid crystal display device manufacturing method using a backlight or a reflector for a lighting system, and the like. can In that case, the optical film with an adhesive layer of this invention can be installed on one side or both sides of display panels, such as a liquid crystal panel. In the case of providing optical films on both sides, they may be the same or different. Further, in the manufacturing method of the liquid crystal display device, appropriate parts such as a diffusion layer, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion sheet, and a backlight may be disposed in one layer or two or more layers at appropriate positions. .

Example

The present invention will be specifically described below with reference to examples, but the present invention is not limited by these examples. In addition, all parts and % in each case are based on weight.

Example 1

<Manufacture of separator>

<<Formation of Oligomer Prevention Layer>>

As a silica-based material, organosiloxane (ethyl silicate 48: Colcoat Co.) was diluted with isopropyl alcohol to a solid content concentration of 1% to prepare a coating liquid. The obtained coating liquid was applied onto a polyester film (thickness: 38 μm) as a base film by a gravure coater so that the thickness after drying was 50 nm, and then dried at 120° C. for 30 seconds to form an oligomer prevention layer (1) formed.

<<formation of conductive layer>>

A solution of water/isopropyl alcohol (1/1: weight ratio) having a solid content concentration of 1% was prepared using poly(ethylenedioxythiophene)/polystyrene sulfonate (PEDOT/PSS) as the conductive polymer. The obtained solution was applied onto the oligomer prevention layer 1 so that the thickness after drying was 100 nm, and dried at 80°C for 2 minutes to form the conductive layer 1.

<<formation of release layer>>

Silicone resin (KS-847H: manufactured by Shin-Etsu Chemical): 20 parts and curing agent (PL-50T: manufactured by Shin-Etsu Chemical): 0.2 parts were diluted with 350 parts of methyl ethyl ketone/toluene mixed solvent (mixing ratio: 1: 1), A solution of the release agent was prepared. The obtained solution of the silicone-based release agent was applied onto the conductive layer 1 with a gravure coater so that the thickness after drying was 100 nm, and then dried at 120°C for 30 seconds to form a release layer, and a polyester film/oligomer A separator of Example 1 having a configuration of prevention layer (1)/conductive layer (1)/release layer was obtained.

Example 2

<Manufacture of separator>

<<formation of conductive layer>>

A solution of water/isopropyl alcohol (1/1: weight ratio) having a solid content concentration of 1% was prepared using poly(ethylenedioxythiophene)/polystyrene sulfonate (PEDOT/PSS) as the conductive polymer. The obtained solution was applied onto a polyester film (thickness: 38 μm) as a base film so that the thickness after drying was 100 nm, and dried at 80° C. for 2 minutes to form the conductive layer 1.

<<Formation of Oligomer Prevention Layer>>

As a silica-based material, silica sol having an average particle diameter of 0.05 µm was diluted with isopropyl alcohol to a solid content concentration of 1% to prepare a coating liquid. The obtained coating liquid was applied onto the conductive layer (1) by a gravure coater so that the thickness after drying was 50 nm, and then dried at 120°C for 30 seconds to form an oligomer prevention layer (2).

<<formation of release layer>>

Polyester film/conductive layer (1)/ A separator of Example 2 having a configuration of oligomer prevention layer (2)/release layer was obtained.

Example 3

<Manufacture of separator>

<<formation of conductive layer>>

Using poly(ethylenedioxythiophene)/polystyrene sulfonate (PEDOT/PSS) as the conductive polymer and a polyurethane resin as the binder resin, a solid content concentration of 0.8% water/isopropyl alcohol (1/1: weight ratio) of A solution was prepared. In addition, the weight ratio of the conductive polymer to the binder resin is 10:1. The obtained solution was applied onto a polyester film (thickness: 38 μm) as a base film so that the thickness after drying was 100 nm, and dried at 80° C. for 2 minutes to form the conductive layer 2.

<<Formation of Oligomer Prevention Layer>>

<<formation of release layer>>

In Example 2, corresponding to <<formation of oligomer prevention layer>> and <<formation of release layer>>, the oligomer prevention layer 2 is formed on the conductive layer 2, and further on the oligomer prevention layer 2 A separator of Example 3 having a configuration of polyester film/conductive layer (2)/oligomer prevention layer (2)/release layer was obtained in the same manner as in Example 2 except that a release layer was formed thereon.

Example 4

<Manufacture of separator>

<<Formation of Oligomer Prevention Layer>>

As a composition containing a polyvinyl alcohol-based resin, 70 parts of a polyvinyl alcohol-based resin (polyvinyl alcohol having a degree of saponification = 88 mol% and a degree of polymerization = 500), a binder polymer (water-based polyester resin: isophthalic acid, ethylene glycol, di 15 parts of a water-based polyester obtained by neutralizing a polyester mainly composed of ethylene glycol with neopentyl glycol and a dicarboxylic acid derivative having an aliphatic dicarboxylic acid anhydride and neutralizing the polyester with an amine compound and subjecting the polyester to water), 15 parts of a crosslinking agent (Hexa 10 parts of methoxymethylmelamine) and 5 parts of inorganic particles (silica sol having an average particle diameter of 65 nm) were diluted with water to a solid content concentration of 2% to prepare a coating liquid. The obtained coating liquid was applied onto a polyester film (thickness: 38 μm) as a base film with a gravure coater so that the thickness after drying was 50 nm, then the film was guided to a tenter and stretched at 100 ° C., then 230 Heat setting was performed at °C to form an oligomer prevention layer (3).

<<formation of conductive layer>>

<<formation of release layer>>

In Example 1, it corresponds to <<formation of conductive layer>> <<formation of release layer>>, and in the same manner as in Example 1, polyester film/oligomer prevention layer (3)/conductive layer (1)/ A separator of Example 4 having a structure of a release layer was obtained.

Comparative Example 1

<Manufacture of separator>

In Example 1, the separator of Comparative Example 1 having the structure of base film/oligomer prevention layer (1)/release layer was obtained in the same manner as in Example 1 except that the conductive layer (1) was not formed.

Comparative Example 2

<Manufacture of separator>

<<Formation of Oligomer Prevention Layer Containing Conductive Agent>>

A composition formed by an oligomer prevention layer containing a conductive agent, a compound having a nitrogen element as a conductive material (a compound having a pyrrolidinium ring in the main chain: manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.: Charrol DC-303P) 85 parts, polyvinyl alcohol-based A coating liquid was prepared by diluting 10 parts of a resin (polyvinyl alcohol having a degree of saponification = 88 mol% and a degree of polymerization = 500) and 5 parts of inorganic particles (silica sol having an average particle diameter of 50 nm) with water to a solid content concentration of 2%. The obtained coating liquid was applied onto a polyester film (thickness: 38 μm) as a base film with a gravure coater so that the thickness after drying was 50 nm, then the film was guided to a tenter and stretched at 100 ° C., then 230 By performing heat setting at °C, an oligomer prevention layer containing a conductive agent was formed.

<<formation of release layer>>

In Example 1, it corresponds to <<formation of release layer>>, and the release layer was formed on the oligomer prevention layer containing the conductive agent, in the same manner as in Example 1, polyester film / oligomer containing the conductive agent A separator of Comparative Example 2 having a structure of prevention layer/release layer was obtained.

<Manufacture of pressure-sensitive adhesive layer with separator>

<<Preparation of acrylic polymer>>

A monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate was charged into a reaction vessel equipped with a cooling tube, a nitrogen inlet tube, a thermometer and a stirring device. In addition, with respect to 100 parts of the monomer mixture (solid content), 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator was injected together with ethyl acetate, and nitrogen gas was introduced while stirring slowly to replace nitrogen, and then the flask The polymerization reaction was carried out for 7 hours while maintaining the liquid temperature at around 60°C. Then, ethyl acetate was added to the obtained reaction liquid to prepare a solution of an acrylic polymer having a weight average molecular weight (Mw) of 1,600,000 adjusted to a solid content concentration of 30%.

<<Preparation of adhesive composition>>

Based on 100 parts of the solid content of the acrylic polymer (A) solution obtained above, as an ionic compound, 0.7 part of 1-ethyl-1-methylpyrrolidinium trifluoromethanesulfonylimide and lithium bis (trifluoromethane) 1.0 part of methanesulfonyl)imide (manufactured by Mitsubishi Materials Electrochemical Co., Ltd.) was blended, and as a crosslinking agent, 0.1 part of trimethylolpropanexylylenediisocyanate (Takenate D110N, manufactured by Mitsui Chemicals) and 0.3 part of dibenzoyl peroxide were added. and 0.2 part of γ-glycidoxypropylmethoxysilane (KBM-403, manufactured by Shin-Etsu Chemical Industry Co., Ltd.) as a silane coupling agent, to obtain a solution of an adhesive composition.

<<formation of adhesive layer>>

The solution of the pressure-sensitive adhesive composition prepared above was uniformly applied on the release layer of the separators of Examples 1 to 4 and Comparative Examples 1 to 2 obtained above with a fountain coater, and then in an air circulation type constant temperature oven at 150 ° C. for 60 seconds It was made to dry, the adhesive layer of thickness 20 micrometer was formed on the surface of the said release layer, and the adhesive layer with a separator of Examples 1-4 and Comparative Examples 1-2 was obtained.

<Manufacture of optical film with pressure-sensitive adhesive layer with separator>

<<manufacture of optical film>>

In order to manufacture a thin polarizer, first, a laminate in which a polyvinyl alcohol (PVA) layer having a thickness of 9 μm is formed on an amorphous polyethylene terephthalate (PET) substrate is air-assisted stretching at a stretching temperature of 130 ° C. A stretched laminate is produced, and then, a colored laminate is produced by dyeing the stretched laminate, and then the colored laminate is stretched in boric acid at a stretching temperature of 65 degrees so that the total draw ratio is 5.94 times. An optical film laminate was created containing a 4 μm thick PVA layer that was integrally stretched. The PVA molecules of the PVA layer formed on the amorphous PET substrate by such two-step stretching are highly oriented, and the iodine adsorbed by dyeing constitutes a highly functional polarizer oriented in one direction as a polyiodine ion complex. An optical film stack containing a 4 μm PVA layer could be produced. In addition, while applying a polyvinyl alcohol-based adhesive to the surface of the polarizer of the optical film laminate, a saponified triacetyl cellulose film having a thickness of 80 μm was bonded, and then the amorphous PET substrate was peeled off, polarization using a thin polarizer A film was made.

<Manufacture of optical film with pressure-sensitive adhesive layer with separator>

Next, to the polarizing film using the thin polarizer obtained above, the adhesive layers with separators of Examples 1 to 4 and Comparative Examples 1 to 2 obtained above were bonded together, the adhesive layers were transferred, and Examples 1 to The optical film with the adhesive layer with a separator of 4 and Comparative Examples 1-2 was obtained.

<Manufacture of image display device>

In order to manufacture an image display device by the RTP bonding step shown in FIG. 3, the long sheets of optical films with a pressure-sensitive adhesive layer with a separator of Examples 1 to 4 and Comparative Examples 1 to 2 obtained above were prepared as roll fabrics, , The liquid crystal panel for conveyance to the sticking position was prepared. After that, while peeling the separator from the optical film with a pressure-sensitive adhesive layer with a separator of Examples 1 to 4 and Comparative Examples 1 to 2 fed from the roll fabric with a release body, the exposed pressure-sensitive adhesive layer was adhered after separation of the separator The adhesive layer side of the optical film was bonded to the liquid crystal panel conveyed to the sticking position, and an image display device (liquid crystal display device) using the liquid crystal panels of Examples 1 to 4 and Comparative Examples 1 to 2 was manufactured.

The weight average molecular weight (Mw) of the (meth)acrylic polymer obtained above was measured by GPC (gel permeation chromatography) under the following conditions.

・Analysis device: Tosoh Corporation, HLC-8120GPC

Column: Tosoh Corporation, G7000HXL+GMHXL+GMHXL

Column size: 7.8 mmφ × 30 cm each

Column temperature: 40 ℃

·Flow rate: 0.8 ml/min

·Injection amount: 100 μl

・Eluent: tetrahydrofuran

Detector: Differential refractometer (RI)

·Standard sample: polystyrene

The following evaluation was performed about the optical film with the separator of Examples 1-4 and Comparative Examples 1-2 obtained above, the adhesive layer with a separator, and the adhesive layer with a separator. Table 1 shows the evaluation results.

<Method of measuring the surface resistance of the release layer>

About the separators of Examples 1-4 and Comparative Examples 1-2 obtained above, the surface resistance value (Ω/□) of the surface of a mold release layer was measured using MCP-HT450 by Mitsubishi Chemical Analytical Corporation.

<Method for measuring surface resistance of pressure-sensitive adhesive layer>

About the adhesive layer with a separator of Examples 1-4 and Comparative Examples 1-2 obtained above, the surface resistance value (Ω/square) of the adhesive layer surface was measured using MCP-HT450 by a Mitsubishi Chemical Analytec company.

<Method for measuring elution amount of PET oligomer>

After leaving the optical film with a pressure-sensitive adhesive layer with a separator of Examples 1 to 4 and Comparative Examples 1 to 2 obtained above on conditions of 60°C and 90%RH for 500 hours, the separator was removed. About 0.025 g of the pressure-sensitive adhesive layer (sample) was collected from the polarizing film with the pressure-sensitive adhesive layer, 1 ml of chloroform was added, and after shaking at room temperature for 18 hours, 5 ml of acetonitrile was added, extracted, and shaken for 3 hours. did The resulting solution was filtered through a 0.45 mL membrane filter to prepare a sample. A standard product of the trimeric PET oligomer was adjusted to a certain concentration, a calibration curve was prepared, and the amount (ppm) of the PET oligomer contained in the pressure-sensitive adhesive was determined using the calibration curve. The calibration curve was prepared by measuring by HPLC using samples of known PET oligomer concentration (ppm).

HPLC device: 1200 series manufactured by Agilent Technologies

Measuring conditions

Column: ZORBAX SB-C18 manufactured by Agilent Technologies

Column temperature: 40 ℃

Column flow rate: 0.8 ml/min

Eluent composition: water/acetonitrile reverse phase gradient conditions

Injection volume: 5 μl

Detector: PDA

Quantitative method: After dissolving a standard sample of PET oligomer trimer in chloroform, the standard was adjusted to a constant concentration by diluting with acetonitrile. A calibration curve was prepared from the HPLC area and the adjusted concentration, and the elution amount of the PET oligomer in the sample was determined.

Further, the elution amount of the PET oligomer is preferably 30 ppm or less, more preferably 20 ppm or less, and still more preferably 10 ppm or less.

The following evaluation was performed about the liquid crystal display device of Examples 1-4 and Comparative Examples 1-2 obtained above. Table 1 shows the evaluation results.

<Evaluation of whiteness>

The liquid crystal display devices of Examples 1 to 4 and Comparative Examples 1 to 2 obtained above were installed on the backlight. A hand was made to contact the edge part of the installed liquid crystal display device, and white nonuniformity was produced in the liquid crystal panel. The time for this white nonuniformity to disappear was measured. The disappearance time is preferably 200 seconds or less, more preferably 100 seconds or less, still more preferably 50 seconds or less, and particularly preferably 20 seconds or less.

As shown in Table 1, good results were obtained in certain evaluation items about Examples 1 to 4 of the present invention. On the other hand, about Comparative Examples 1-2, the result inferior to Examples 1-4 was obtained in a certain evaluation item. From these results, according to the present invention, by suppressing elution of oligomers contained in base films such as polyester films used for separators to the pressure-sensitive adhesive layer, problems of liquid crystal panels due to luminance non-uniformity due to bright spots can be prevented. Also, at the time of production of a liquid crystal display device, even if the above RTP bonding step is applied, it is found that a pressure-sensitive adhesive layer with a separator capable of suppressing non-uniform whiteness of a liquid crystal panel and an optical film with a pressure-sensitive adhesive layer with a separator can be provided. could

1: Separator
2: pressure-sensitive adhesive layer with separator
3: Optical film with a pressure-sensitive adhesive layer with a separator
4: optical film with adhesive layer
5: display panel
11: base film
12: release layer
13: oligomer prevention layer
14: conductive layer
21: adhesive layer
31: optical film
100: release body
101: attached position
102: receiving roller
103: attaching roller

Claims (9)

As a pressure-sensitive adhesive layer with a separator having a pressure-sensitive adhesive layer on the separator,
The separator has a release layer on a base film, and an oligomer prevention layer and a conductive layer between the base film and the release layer,
The pressure-sensitive adhesive layer is formed on the release layer of the separator,
The pressure-sensitive adhesive layer is a layer formed of a pressure-sensitive adhesive composition containing a base polymer and a conductive compound,
The surface resistance value of the release layer is 1.0 × 10 ¹² Ω/□ or less, the pressure-sensitive adhesive layer with a separator characterized in that. According to claim 1,
The adhesive layer with a separator characterized in that the oligomer prevention layer is a layer formed of a composition containing a silica-based material and/or a polyvinyl alcohol-based resin. According to claim 1,
The pressure-sensitive adhesive layer with a separator characterized in that the conductive layer is a layer formed of a conductive composition containing a conductive polymer. According to claim 1,
The pressure-sensitive adhesive layer with a separator characterized in that the surface resistance value of the pressure-sensitive adhesive layer is 1.0 × 10 ¹² Ω/square or less. On at least one side of the optical film,
An optical film with a pressure-sensitive adhesive layer with a separator characterized in that the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive layer with a separator according to any one of claims 1 to 4 is bonded. On at least one side of the display panel,
An image display device characterized in that the adhesive layer side of the optical film with an adhesive layer in a state in which the separator has been peeled is bonded from the optical film with an adhesive layer with a separator according to claim 5. A method of manufacturing the image display device according to claim 6,
A roll fabric preparation step of preparing a long sheet of the optical film with the separator-attached pressure-sensitive adhesive layer as a roll fabric;
a display panel transport preparation step in which the display panel is prepared by transporting the display panel to the sticking position;
While peeling the separator from the optical film with the pressure-sensitive adhesive layer with the separator drawn out from the roll fabric with a release body, the pressure-sensitive adhesive layer side of the optical film with the pressure-sensitive adhesive layer exposed after the separation of the separator is conveyed to the sticking position A method of manufacturing an image display device comprising a bonding step of bonding to the display panel to be formed. delete delete

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