KR20200091618A - Polarizing film, manufacturing method of same and liquid crystal display device comprising same - Google Patents

Abstract

An application of the present invention relates to a polarizing film, a manufacturing method thereof, and a liquid crystal display device including the polarizing film. The polarizing film comprises: a polarizer; a polarizing plate protective film provided on one surface of the polarizing plate; and an adhesive layer. After changing, the adhesion to a display panel is increased.

Description

A polarizing film, a manufacturing method thereof, and a liquid crystal display device including the same {POLARIZING FILM, MANUFACTURING METHOD OF SAME AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING SAME}

The present application relates to a polarizing film, a method for manufacturing the same, and a liquid crystal display device including the same.

Conventionally, an adhesive layer having a high adhesive strength from the initial stage of adhesion is known. In addition, in the case of fixing the substrate using the pressure-sensitive adhesive layer, an adhesive layer having sufficient adhesion to fix the substrate is selected.

On the other hand, air bubbles or unexpected foreign substances generated in the process of bonding the pressure-sensitive adhesive layer to the substrate may be introduced, which is undesirable in terms of aesthetics or adhesiveness, and in some cases, re-adhesion of the pressure-sensitive adhesive layer is required. However, in the case of an adhesive layer having a high adhesive strength, such re-adhesion is difficult.

Therefore, a technique for reducing such bubbles has been devised. For example, a technique of forming a surface shape of irregularities on an adhesive surface of a pressure-sensitive adhesive by an embossed liner has been devised. In this case, even when air bubbles are mixed between the two when the pressure-sensitive adhesive is bonded to the substrate, air easily flows out through the surface grooves of the pressure-sensitive adhesive, and thus it is easy to remove bubbles without re-adhesion. However, the pressure-sensitive adhesive described above requires a certain thickness to form a groove. In addition, when the pressure-sensitive adhesive is lightly adhered to the substrate, the adhesive area becomes small due to the presence of a groove, so that operations such as rework and position refreshing are easy to perform, but sufficient adhesive strength cannot be obtained. There is also a possibility.

In the case of a polarizing plate, a protective film for a polarizing plate is adhered to one surface of the polarizing plate, and a display panel is attached to the other side, wherein the display panel is attached through an adhesive layer. When attaching the display panel, if a misadhesion occurs as described above, in the case of the adhesive layer having a high adhesive strength from the beginning, shock is applied to the polarizing plate and the display panel upon re-peeling, which has a disadvantage of poor durability, and the adhesive force is When it is formed low from the beginning, it has the disadvantage of poor adhesion to the display panel.

Therefore, in consideration of this situation, when attaching the display panel to the polarizing plate, the adhesive strength is maintained low at the beginning of adhesion, and the adhesive strength is maintained low even after adhesion with the display panel, and thereafter, sufficient adhesive force required for fixing the display panel is developed. There is a need to develop a polarizing film that can.

Japanese Patent Publication No. 2006-299283

The present application is to provide a polarizing film, a method for manufacturing the same, and a liquid crystal display device including the same.

One embodiment of the present application, the polarizing plate; A polarizing plate protective film provided on one surface of the polarizing plate; And a pressure-sensitive adhesive layer provided on the opposite side of the surface of the polarizing plate where the polarizing plate protective film is in contact, wherein the opposite side of the side of the pressure-sensitive adhesive layer contacting the polarizing plate is bonded to a glass substrate at 23° C. for 2 hours. Provided is a polarizing film having an initial adhesive strength of 100 gf/inch or less after standing, and a post-adhesive strength of 50 gf/inch or more after heat treatment at 50° C. for 20 minutes.

In another exemplary embodiment, preparing a polarizing plate; Forming a polarizing plate protective film on one surface of the polarizing plate; And forming a pressure-sensitive adhesive layer on the opposite side of the surface of the polarizing plate where the polarizing plate protective film is in contact, after bonding the opposite side of the pressure-sensitive adhesive layer to the polarizing plate against the glass substrate. Provided is a method for producing a polarizing film having an initial adhesive strength of 100 gf/inch or less after standing at 23° C. for 2 hours, and a post-adhesive strength of 50 gf/inch or more after heat treatment at 50° C. for 20 minutes.

Another exemplary embodiment of the present application, the polarizing film according to an exemplary embodiment of the present application; And it is intended to provide a liquid crystal display comprising a display panel provided on the opposite surface of the pressure-sensitive adhesive layer in contact with the polarizing plate.

In the polarizing film according to an exemplary embodiment of the present application, the initial adhesive strength before the variable may be kept low, and the late adhesive force after the variable after a specific heat treatment process is formed high, so that rework characteristics are easy when misadjusted before the variable. And, it has a characteristic that the adhesive strength with the display panel is improved after variable.

Particularly, the polarizing film according to an exemplary embodiment of the present application includes a polymer and a (meth)acrylate-based resin having a melting temperature (Tm) of 35° C. or higher as the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive layer comprising the same is used for the display panel and the initial stage. It has the characteristic of low adhesion, and it has the characteristic that it does not increase the adhesion even when stored at room temperature for a long time and remains constant.

In addition, the polarizing film according to an exemplary embodiment of the present application includes a polymer and a (meth)acrylate-based resin having a melting temperature (Tm) of 35° C. or higher as an adhesive composition, and the adhesive strength increases after a specific heat treatment, It has excellent characteristics of adhesion to the display panel.

1 is a view showing a schematic laminated structure of a polarizing film according to an exemplary embodiment of the present application.
2 is a view showing a DSC graph of the polymer showing the glass transition temperature behavior.
3 is a view showing a DSC graph of a polymer showing a melting temperature behavior.

Hereinafter, the present specification will be described in more detail.

In the present specification, when a part “includes” a certain component, it means that the component may further include other components, rather than excluding other components, unless otherwise specified.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

One embodiment of the present application, the polarizing plate; A polarizing plate protective film provided on one surface of the polarizing plate; And a pressure-sensitive adhesive layer provided on the opposite side of the surface of the polarizing plate where the polarizing plate protective film is in contact, wherein the opposite side of the side of the pressure-sensitive adhesive layer contacting the polarizing plate is bonded to a glass substrate at 23° C. for 2 hours. Provided is a polarizing film having an initial adhesive strength of 100 gf/inch or less after standing, and a post-adhesive strength of 50 gf/inch or more after heat treatment at 50° C. for 20 minutes.

In the case of the polarizing film according to the present application, the initial adhesive force before variable may be kept low, and the late adhesive force after variable after a specific heat treatment process is formed high, so that it is easy to rework in case of misadjustment before variable and variable. After that, the adhesive strength with the display panel is improved.

1 shows a side view of a polarizing film according to the present application, and specifically, it can be confirmed that the polarizing plate protective film 10 / polarizing plate 20 / adhesive layer 30 has a stacked form sequentially.

In one embodiment of the present application, the adhesive strength of the surface of the pressure-sensitive adhesive layer contacting the polarizing plate is 600 gf/in or more and 1000 gf/in or less.

In another exemplary embodiment, the adhesive strength of the surface of the pressure-sensitive adhesive layer contacting the polarizing plate is 600 gf/in or more and 1000 gf/in or less, preferably 650 gf/in or more and 950 gf/in or less, more preferably 700 gf/in or more and 900 gf It can be less than /in.

The adhesive force of the surface of the pressure-sensitive adhesive layer contacting the polarizing plate is in the manufacturing process of the polarizing film, and after laminating the adhesive film to the polarizing plate, the adhesive force in the above range can be secured through a heat treatment process, whereby the polarizing plate and the adhesive film It has a characteristic that can form an integral polarizing film.

In one embodiment of the present application, the pressure-sensitive adhesive layer includes a pressure-sensitive adhesive composition or a cured product thereof, and the pressure-sensitive adhesive composition includes (meth)acrylate-based resin; A polymer having a melting temperature (Tm) of 35°C or higher; And a curing agent, wherein the polymer is a copolymer of a monofunctional polysiloxane and one or more monomers.

Particularly, the polarizing film according to an exemplary embodiment of the present application includes a polymer and a (meth)acrylate-based resin having a melting temperature (Tm) of 35° C. or higher as the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive layer comprising the same is used for the display panel and the initial stage. It has the characteristic of low adhesion, and it has the characteristic that it does not increase the adhesion even when stored at room temperature for a long time and remains constant.

In addition, the polarizing film according to an exemplary embodiment of the present application includes a polymer and a (meth)acrylate-based resin having a melting temperature (Tm) of 35° C. or higher as an adhesive composition, and the adhesive strength increases after a specific heat treatment, It has excellent characteristics of adhesion to the display panel.

In one embodiment of the present application, the pressure-sensitive adhesive layer may include the pressure-sensitive adhesive composition as it is.

In one embodiment of the present application, the pressure-sensitive adhesive layer may include a cured product of the pressure-sensitive adhesive composition.

In an exemplary embodiment of the present application, the initial adhesive strength after standing for 2 hours at 23°C after bonding the opposite surface of the pressure-sensitive adhesive layer to the polarizing plate to the glass substrate is 100 gf/inch or less, and then at 50°C 20 After the minute heat treatment, the post-adhesive strength may be 500 gf/inch or more.

The initial adhesive strength and late adhesive strength were measured using a texture analyzer (Texture analyzer (Stable Micro Systems)) at a 180° angle and a peeling rate of 1800 mm/min, and the adhesive layer according to the present invention was reciprocated once with a 2 kg rubber roller. After attaching to the glass substrate, each was measured.

In another embodiment, the initial adhesive strength after leaving for 2 hours at 23°C after bonding the opposite side of the pressure-sensitive adhesive layer to the polarizing plate to the glass substrate is 100 gf/inch or less, preferably 90 gf/inch or less, More preferably, it may be 80 gf/inch or less.

In another embodiment, the initial adhesive strength after leaving for 2 hours at 23°C after bonding the opposite side of the pressure-sensitive adhesive layer to the polarizing plate to the glass substrate is 5 gf/inch or more, preferably 10 gf/in or more, More preferably, it may be 15 gf/in or more.

In another exemplary embodiment, the adhesive strength of the adhesive layer is 500 gf/inch or more after leaving the opposite side of the pressure-sensitive adhesive layer in contact with the polarizing plate at 23°C for 2 hours after bonding to the glass substrate, followed by heat treatment at 50°C for 20 minutes. , Preferably 700gf/inch or more, more preferably 1000gf/inch or more.

In another exemplary embodiment, the adhesive strength of the adhesive layer is 5000 gf/inch or less after heat treatment at 50° C. for 20 minutes after leaving the opposite surface of the pressure-sensitive adhesive layer contacting the polarizing plate at 23° C. for 2 hours after bonding to the glass substrate. , Preferably less than 4000gf/inch, more preferably less than 3000gf/inch.

In one embodiment of the present application, after bonding the opposite surface of the pressure-sensitive adhesive layer to the polarizing plate against the glass substrate, the initial adhesive strength after standing at 23°C for 2 hours is 100 gf/inch or less, and at 23°C for 24 hours Provided is a polarizing film having medium-term adhesion after standing is 110 gf/inch or less.

The initial adhesive force may have the same meaning as the initial adhesive force mentioned above.

The medium-term adhesion was measured using a texture analyzer (Texture analyzer (Stable Micro Systems)) at a 180° angle and a peeling rate of 1800 mm/minute, and the adhesive layer according to the present invention was reciprocated once with a 2 kg rubber roller to the glass substrate. After attaching to each was measured.

In one embodiment of the present application, after bonding the opposite surface of the pressure-sensitive adhesive layer to the polarizing plate to the glass substrate, the medium-term adhesion after leaving at 23° C. for 24 hours is 110 gf/inch or less, preferably 95 gf/inch Hereinafter, more preferably, it may be 90 gf/inch or less.

In another exemplary embodiment, after bonding the opposite side of the pressure-sensitive adhesive layer to the polarizing plate against the glass substrate, the medium-term adhesion after standing at 23° C. for 24 hours is 10 gf/inch or more, preferably 15 gf/inch or more. , More preferably 20gf/inch or more.

The adhesive film according to the present application, by including a polymer having a melting temperature of 35° C. or higher as described above, maintains a characteristic that the adhesive strength is kept constant at a low level even after leaving for 2 hours at 24° C./ leaving for 24 hours at room temperature (23° C.). You have.

That is, the pressure-sensitive adhesive layer of the polarizing film according to the present application can prevent an increase in adhesive strength even if it is left at room temperature for a long time, so that the display panel has a feature that can be reworked even when it is incorrectly attached. It has the characteristics of being convenient and free of foreign matter.

In one embodiment of the present application, the late adhesive force/the initial adhesive force is 1.2 or more and 500 or less.

In another exemplary embodiment, the late adhesive force/the initial adhesive force may be 1.2 or more and 500 or less, preferably 5 or more and 450 or less, and more preferably 20 or more and 400 or less.

The polarizing film according to the present application is characterized in that the post-adhesive strength is significantly increased compared to the initial adhesive strength, and accordingly, the rework property is excellent in the case of incorrect adhesion in the initial stage of adhesion, and the post-adhesive strength after a specific process is greatly increased, thereby displaying the panel. It has excellent properties of adhesion to the fruit.

In one embodiment of the present application, the pressure-sensitive adhesive composition of the pressure-sensitive adhesive layer is a (meth)acrylate-based resin; A polymer having a melting temperature (Tm) of 35°C or higher; And a curing agent, wherein the polymer is a copolymer of a monofunctional polysiloxane and one or more monomers.

In another embodiment, the pressure-sensitive adhesive composition of the pressure-sensitive adhesive layer is a (meth)acrylate-based resin; A polymer having a melting temperature (Tm) of 35°C or higher; And a curing agent, wherein the polymer is a copolymer of a monofunctional polysiloxane and one or more and three or less monomers.

In another embodiment, the pressure-sensitive adhesive composition of the pressure-sensitive adhesive layer is a (meth)acrylate-based resin; A polymer having a melting temperature (Tm) of 35°C or higher; And a curing agent, wherein the polymer is a copolymer of a monofunctional polysiloxane and one monomer.

In another embodiment, the pressure-sensitive adhesive composition of the pressure-sensitive adhesive layer is a (meth)acrylate-based resin; A polymer having a melting temperature (Tm) of 35°C or higher; And a curing agent, wherein the polymer is a copolymer of a monofunctional polysiloxane and two monomers.

In one embodiment of the present application, the components of the polymer contained in the pressure-sensitive adhesive composition may be confirmed through GC (Gas chromatography) analysis, and the composition may be identified by NMR (Nuclear magnetic resonance) analysis.

The pressure-sensitive adhesive composition according to an exemplary embodiment of the present application includes a polymer having a melting temperature of 35° C. or higher, so that the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer produced using it is kept low. The fact that the adhesive strength is kept low means that there is no difference between the adhesive strength in the initial state after laminating the adhesive layer on the display panel and the adhesive strength after a specific time has elapsed. The meaning of no difference may include some errors that do not mean the exact same number.

In addition, the pressure-sensitive adhesive composition according to an exemplary embodiment of the present application includes a polymer having a melting temperature of 35° C. or higher, so that the pressure-sensitive adhesive layer after lamination is performed on the display panel by using the pressure-sensitive adhesive layer prepared thereafter. It has the characteristic of rising and having variable characteristics.

The melting temperature according to the present application refers to a temperature at which a phase transition occurs from a solid state to a liquid state from a solid state. In particular, as the polymer is heated, a large change in the three-dimensional structure occurs at a specific temperature, as if a phase transition occurs. It is possible to observe a change corresponding to, and the temperature at this time can be defined as the melting temperature.

The melting temperature can be measured by DSC (Differential thermal analysis). Specifically, it is a value measured by drawing about 10 mg of heat and heating value of a substance as a result of phase shift when the sample is sealed in a dedicated pen and heated to a constant heating environment.

That is, the pressure-sensitive adhesive composition according to an exemplary embodiment of the present application, as it includes a polymer exhibiting a melting temperature (Tm) behavior, compared to a case including a polymer exhibiting a glass transition temperature (Tg) behavior, has excellent variable properties, , In particular, it has the characteristics of excellent stability over time that does not increase the adhesive strength at room temperature (25 ℃).

Figure 2 shows the DSC graph for the polymer showing the glass transition temperature (Tg) behavior, Figure 3 shows the DSC graph for the polymer showing the melting temperature (Tm) behavior.

As can be seen in Figure 2, in the case of a polymer showing a glass transition temperature behavior, it can be seen that phase transition occurs as the temperature is gradually increased with respect to a stable section (Glassy), and gradually transitions in a wide range of temperature ranges (Glassy-> Rubbery) can be confirmed. In other words, when a polymer exhibiting a glass transition temperature behavior is included, variable characteristics may occur, but the phase transition temperature section is wide, and when stored at room temperature (25°C) for a long time, some phase transition occurs, and the adhesive strength of the pressure-sensitive adhesive layer increases, resulting in stability over time. This may lead to poor results, and the variable characteristics may not be excellent in a phase transition state as a rubbery state.

Conversely, as can be seen in FIG. 3, in the case of a polymer showing a melting temperature behavior, when the temperature is gradually increased with respect to a stable section, a rapid phase transition (Solid->liquid) occurs at a specific temperature (melting). have. That is, when a polymer exhibiting a melting temperature behavior is included, rapid phase transition occurs at a specific temperature value, and phase transition does not occur at a temperature lower than the melting temperature, so that an increase in adhesive strength can be suppressed (excellent stability over time). At the above temperature, a phase transition occurs, and the adhesive force rapidly increases (excellent in variable characteristics).

In one embodiment of the present application, the monomer provides a polarizing film represented by Formula 1 below.

[Formula 1]

In Chemical Formula 1,

X is N or O,

R ₁ is hydrogen or a methyl group,

n is an integer from 10 to 30.

In one embodiment of the present application, n in Chemical Formula 1 may be an integer of 10 to 30.

In another exemplary embodiment, n in Chemical Formula 1 may be an integer of 15 to 25.

In another exemplary embodiment, n of Chemical Formula 1 may be an integer of 16 to 22.

In one embodiment of the present application, X may be N.

In one embodiment of the present application, X may be O.

In Chemical Formula 1, in particular, when the n value has the above range, some crystallization starts to occur by entanglement between the side chains of carbon, so that the polymer containing it can exhibit the melting temperature (Tm) behavior. do.

The polymer having a melting temperature of 35°C or higher means that when the monofunctional polysiloxane and one or more monomers represented by Formula 1 are copolymerized, the melting temperature of the final polymer has a value of 35°C or higher.

In one embodiment of the present application, the melting temperature of the polymer may be 35°C or higher, 70°C or lower, preferably 60°C or lower, and more preferably 50°C or lower.

The copolymerization means an article obtained by polymerizing two or more different monomers, and in the copolymer, two or more monomers may be irregularly or regularly arranged.

The copolymer is a random copolymer (Random Copolymer) having a form in which monomers are mixed with each other without a rule, a block copolymer (Block Copolymer) in which blocks arranged in a certain section are repeated, or an alternating form in which monomers are alternately repeated and polymerized. There may be a copolymer (Alternating Copolymer), and the polymer having a melting temperature of 35° C. or higher according to an exemplary embodiment of the present application may be an irregular copolymer, a block copolymer, or an alternating copolymer.

In one embodiment of the present application, the monomer represented by Chemical Formula 1 provides a polarizing film that is one or more selected from the group consisting of STA (Stearyl acrylate) and STMA (Stearyl methacrylate).

As the monofunctional polysiloxane according to the present application, Chisso FM-0721, Shin-Etsu KF2012, etc. may be used, but are not limited thereto.

In one embodiment of the present application, the polymer having a melting temperature of 35°C or higher may have a weight average molecular weight of 30,000 g/mol to 200,000 g/mol.

In another exemplary embodiment, the polymer having a melting temperature of 35°C or higher may have a weight average molecular weight of 30,000 g/mol to 150,000 g/mol, preferably 30,000 g/mol to 100,000 g/mol. .

When the polymer having a melting temperature of 35° C. or higher according to the present application has a weight average molecular weight value in the above range, the arrangement of the molecules in the polymer is excellent, so that the initial adhesive strength during manufacturing of the pressure-sensitive adhesive layer is low.

The weight average molecular weight is a value obtained by averaging molecular weights of component molecular species of a polymer compound having a molecular weight distribution as one of the average molecular weights of which the molecular weight is not uniform and the molecular weight of a certain polymer material is used as a reference.

The weight average molecular weight can be measured through Gel Permeation Chromatography (GPC) analysis.

The polymer having a melting temperature of 35°C or higher may include the monofunctional polysiloxane; The one or more monomers; And it may be prepared by including a thermal polymerization initiator in a polymer composition comprising a solvent.

As the solvent, toluene may be used, but if the monofunctional polysiloxane and the one or more monomers can be dissolved, the present invention is not limited thereto, and a general organic solvent may be used.

In one embodiment of the present application, the polymer having a melting temperature of 35°C or higher is based on 100 parts by weight of the polymer having a melting temperature of 35°C or higher, based on 100 parts by weight of the monofunctional polysiloxane, and 40 parts by weight or less, and 60 parts by weight of the monomer. It provides a polarizing film containing more than 90 parts by weight or less.

In one embodiment of the present application, the polymer having a melting temperature of 35°C or higher is based on 100 parts by weight of the polymer having a melting temperature of 35°C or higher, based on 100 parts by weight of the monofunctional polysiloxane, and 40 parts by weight or less, preferably 15 parts by weight It may contain more than 30 parts by weight, more preferably 18 parts by weight or more and 25 parts by weight or less.

In an exemplary embodiment of the present application, the polymer having a melting temperature of 35° C. or higher is based on 100 parts by weight of the polymer having a melting temperature of 35° C. or higher, and 60 parts by weight or more and 90 parts by weight or less of the monomer, preferably 65 parts by weight or more and 85 It may contain less than or equal to 70 parts by weight, more preferably less than or equal to 85 parts by weight.

When the polymer having a melting temperature of 35° C. or higher according to the present application includes the monofunctional polysiloxane and the monomer in the parts by weight, the melting temperature value of the entire polymer may be appropriately formed, and thus, at a normal temperature of the adhesive sheet later. The initial adhesive strength may be kept low, and stability over time at room temperature also has excellent characteristics.

In an exemplary embodiment of the present application, the pressure-sensitive adhesive composition provides a polarizing film comprising 1 to 10 parts by weight of a polymer having a melting temperature of 35°C or higher based on 100 parts by weight of a (meth)acrylate-based resin.

In another exemplary embodiment, the pressure-sensitive adhesive composition may be included in 1 to 7 parts by weight of the polymer having a melting temperature of 35°C or higher, preferably 2 to 6 parts by weight, based on 100 parts by weight of the (meth)acrylate-based resin.

When the polymer having a melting temperature of 35° C. or higher is included in the pressure-sensitive adhesive composition in parts by weight of the above range, the amount of the polymer may be suitable, and thus stability over time at room temperature is excellent, so that the adhesive strength can be kept constant. Later, in the variable process with the display panel, the variable performance has excellent characteristics.

In one embodiment of the present application, the (meth)acrylate-based resin may include a (meth)acrylate-based resin having a weight average molecular weight of 100,000 g/mol to 5 million g/mol.

In the present specification, (meth)acrylate is meant to include both acrylate and methacrylate. The (meth)acrylate-based resin may be, for example, a copolymer of a (meth)acrylic acid ester-based monomer and a crosslinkable functional group-containing monomer.

The (meth)acrylic acid ester-based monomer is not particularly limited, and examples thereof include alkyl (meth)acrylate, and more specifically, as a monomer having an alkyl group having 1 to 12 carbon atoms, pentyl (meth)acrylate, n-butyl (meth)acrylate, ethyl (meth)acrylate, methyl (meth)acrylate, hexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethyl Hexyl (meth) acrylate, dodecyl (meth) acrylate and decyl (meth) acrylate may include one or more kinds.

The crosslinkable functional group-containing monomer is not particularly limited, but may include, for example, one or more of hydroxy group-containing monomer, carboxyl group-containing monomer, and nitrogen-containing monomer.

Examples of the hydroxyl group-containing compound include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 6-hydroxyhexyl (meth) )Acrylate, 8-hydroxyoctyl (meth)acrylate, 2-hydroxyethylene glycol (meth)acrylate, or 2-hydroxypropylene glycol (meth)acrylate.

Examples of the carboxyl group-containing compound include (meth)acrylic acid, 2-(meth)acryloyloxyacetic acid, 3-(meth)acryloyloxypropyl acid, 4-(meth)acryloyloxybutyl acid, acrylic acid double Sieve, itaconic acid, maleic acid, or maleic anhydride.

Examples of the nitrogen-containing monomers include (meth)acrylonitrile, N-vinyl pyrrolidone or N-vinyl caprolactam.

The (meth)acrylate-based resin may also be further copolymerized with at least one of vinyl acetate, styrene, and acrylonitrile from the viewpoint of improving other functions such as compatibility.

In one embodiment of the present application, the acrylate-based resin may be selected from the group consisting of alkyl (meth)acrylates, hydroxyalkyl acrylates, and nitrogen-containing monomers.

As the alkyl acrylate and alkyl methacrylate, a monomer having an alkyl group having 1 to 12 carbon atoms, pentyl (meth)acrylate, n-butyl (meth)acrylate, ethyl (meth)acrylate, methyl (meth)acrylic Rate, hexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, dodecyl (meth)acrylate and decyl (meth)acrylate It may include one or more of.

Examples of the hydroxyalkyl acrylate include 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 6-hydroxyhexyl acrylate, 8-hydroxyoctyl acrylate, and 2 -Hydroxyethylene glycol acrylate, or 2-hydroxypropylene glycol acrylate.

Examples of the nitrogen-containing monomers include VP (N-vinyl pyrrolidone, N-vinyl pyrrolidone).

In one embodiment of the present application, the (meth)acrylate-based resin is based on 100 parts by weight of the (meth)acrylate-based resin, 50 to 70 parts by weight of an alkyl acrylate, 5 to 40 parts by weight of an alkyl methacrylate, nitrogen It may contain 0.1 to 10 parts by weight of the containing monomer and 1 to 30 parts by weight of hydroxyalkyl acrylate.

The (meth) acrylate-based resin is 50 to 70 parts by weight of alkyl acrylate, 5 to 40 parts by weight of alkyl methacrylate, 0.1 to 10 parts by weight of nitrogen-containing monomer and 1 to 30 parts by weight of hydroxyalkyl acrylate The meaning is that the alkyl acrylate monomer, the alkyl methacrylate monomer, the nitrogen-containing monomer and the hydroxyalkyl acrylate monomer are polymerized in the above weight ratio.

In one embodiment of the present application, the (meth)acrylate-based resin is based on 100 parts by weight of the (meth)acrylate-based resin, 50 to 70 parts by weight of an alkyl acrylate, preferably 55 to 70 parts by weight, more preferably It may include 60 to 70 parts by weight.

In one embodiment of the present application, the (meth)acrylate-based resin is based on 100 parts by weight of the (meth)acrylate-based resin, 5 to 40 parts by weight of an alkyl methacrylate, preferably 7 to 35 parts by weight, more Preferably it may include 10 to 30 parts by weight.

In one embodiment of the present application, the (meth)acrylate-based resin is based on 100 parts by weight of the (meth)acrylate-based resin, 0.1 to 10 parts by weight of a nitrogen-containing monomer, preferably 1 to 10 parts by weight, more preferably It may include 3 to 10 parts by weight.

In one embodiment of the present application, the (meth)acrylate-based resin is based on 100 parts by weight of the (meth)acrylate-based resin, 1 to 30 parts by weight of hydroxyalkyl acrylate, preferably 5 to 25 parts by weight, More preferably, it may include 5 to 20 parts by weight.

When the (meth)acrylate-based resin has the above composition and content, it has a characteristic that the variable properties of the pressure-sensitive adhesive layer later.

In one embodiment of the present application, the pressure-sensitive adhesive composition may further include at least one selected from the group consisting of a solvent, a dispersant, a photoinitiator, a heat initiator and a tackifier.

According to an exemplary embodiment of the present specification, the crosslinkable compound is hexanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate having a number of ethylene groups 2 to 14, trimethyl All propane di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, 2-trisacryloyloxymethylethylphthalic acid, propylene group Acidic variants and di of propylene glycol di(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol penta(meth)acrylate having 2 to 14 Compounds obtained by esterifying polyhydric alcohols such as a mixture of pentaerythritol hexa(meth)acrylate (trade name TO-2348, TO-2349, manufactured by Nippon Donga Synthesis) with α,β-unsaturated carboxylic acid; Compounds obtained by adding (meth)acrylic acid to a compound containing a glycidyl group, such as trimethylolpropane triglycidyl ether acrylic acid adduct and bisphenol A diglycidyl ether acrylic acid adduct; Phthalic acid diesters of β-hydroxyethyl (meth)acrylate, toluene diisocyanate adducts of β-hydroxyethyl (meth)acrylate, and other compounds having hydroxyl groups or ethylenically unsaturated bonds and ester compounds of polyhydric carboxylic acids , Or adducts with polyisocyanates; (Meth)acrylic acid alkyl esters such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate; And 9,9'-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, and may include one or more selected from the group consisting of, and is not limited to these, known in the art You can use common ones.

According to one embodiment of the present specification, the photoinitiator is a triazine-based compound, a biimidazole compound, an acetophenone-based compound, an O-acyloxime-based compound, a thioxanthone-based compound, a phosphine oxide-based compound, a coumarin-based compound, and benzophene It may be substituted with 1 or 2 or more substituents selected from the group consisting of non-based compounds.

Specifically, according to an exemplary embodiment of the present specification, the photoinitiator is 2,4-trichloromethyl-(4'-methoxyphenyl)-6-triazine, 2,4-trichloromethyl-(4'-meth Thoxystyryl)-6-triazine, 2,4-trichloromethyl-(fiflonil)-6-triazine, 2,4-trichloromethyl-(3',4'-dimethoxyphenyl)-6 -Triazine, 3-{4-[2,4-bis(trichloromethyl)-s-triazine-6-yl]phenylthio} propanoic acid, 2,4-trichloromethyl-(4'-ethyl ratio Triazine-based compounds such as phenyl)-6-triazine or 2,4-trichloromethyl-(4'-methylbiphenyl)-6-triazine; 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl biimidazole or 2,2'-bis(2,3-dichlorophenyl)-4,4',5 Biimidazole-based compounds such as ,5'-tetraphenylbiimidazole; 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 4-(2-hydroxye Thoxy)-phenyl (2-hydroxy)propyl ketone, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenyl acetophenone, 2-methyl-(4-methylthiophenyl)-2-mol Acetopes such as polyno-1-propan-1-one (Irgacure-907) or 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one (Irgacure-369) Non-based compounds; O-acyloxime compounds such as Irgacure OXE 01 and Irgacure OXE 02 from Ciba Geigy; Benzophenone compounds such as 4,4'-bis(dimethylamino)benzophenone or 4,4'-bis(diethylamino)benzophenone; Thioxanthone-based compounds such as 2,4-diethyl thioxanthone, 2-chloro thioxanthone, isopropyl thioxanthone or diisopropyl thioxanthone; 2,4,6-trimethylbenzoyl diphenylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentyl phosphine oxide or bis(2,6-dichlorobenzoyl) propyl phosphine oxide Phosphine oxide compounds such as; 3,3'-carbonylvinyl-7-(diethylamino)coumarin, 3-(2-benzothiazolyl)-7-(diethylamino)coumarin, 3-benzoyl-7-(diethylamino)coumarin, 3-benzoyl-7-methoxy-coumarin or 10,10'-carbonylbis[1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-Cl] -Coumarin-based compounds such as benzopyrano [6,7,8-ij]-quinolinazine-11-one may be used alone or in combination of two or more, but are not limited thereto.

In addition, the thermal initiator may be used in the art.

Toluene may be used as the solvent, but is not limited thereto as long as it can dissolve a specific substance, and thus a general organic solvent may be used.

In one embodiment of the present application, there is provided a polarizing film further comprising a release film on the opposite surface of the pressure-sensitive adhesive layer in contact with the polarizing plate.

The release film may be a hydrophobic film may be used, as a layer for protecting a very thin pressure-sensitive adhesive layer, refers to a transparent layer attached to one side of the pressure-sensitive adhesive layer, excellent mechanical strength, thermal stability, moisture shielding property, isotropy, etc. Can be used. For example, acetate, polyester, polyethersulfone, polycarbonate, polyamide, polyimide, polyolefin, cycloolefin, polyurethane, and acrylic resin films such as triacetyl cellulose (TAC), etc. It can be used, but if the commercially available silicone-treated release film is not limited thereto.

The release film may be removed later when the display panel is attached.

In one embodiment of the present application, the thickness of the pressure-sensitive adhesive layer is 3 μm or more and 100 μm It may be:

In another exemplary embodiment, the thickness of the pressure-sensitive adhesive layer is 3 μm or more and 100 μm Or less, preferably 5 μm or more and 80 μm Hereinafter, more preferably 10 μm or more and 50 μm It may be:

When the thickness of the pressure-sensitive adhesive layer has the above range, the rework property is excellent when mis-adhering, and in particular, it has a property that no foreign matter remains when removing the pressure-sensitive adhesive layer.

In one embodiment of the present application, the thickness of the polarizing film is 110 μm or more and 700 μm It provides an adhesive film which is as follows.

In another embodiment, the thickness of the polarizing film is more than 120 ㎛ 600 ㎛ Hereinafter, preferably 125 μm or more and 550 μm Hereinafter, more preferably 130 μm or more and 500 μm It may be:

Since the polarizing film has the above range, the thickness is suitable when applied to a liquid crystal display device in the future, and also has excellent rework properties when attached incorrectly, and in particular, has a property that no foreign matter remains when removing the adhesive layer. do.

In one embodiment of the present application, the pressure-sensitive adhesive layer may be laminated in multiple numbers.

In the present application, the adhesive film may be prepared by applying an adhesive composition on a base layer with a bar coater.

In one embodiment of the present application, the substrate layer is PET (polyethylene terephthalate), polyester (polyester), PC (Polycarbonate), PI (polyimide), PEN (polyethylene naphthalate), PEEK (polyether ether ketone), PAR ( polyarylate), polycylicolefin (PCO), polynorbornene, polyethersulphone (PES), and cycloolefin polymer (COP).

In one embodiment of the present application, the polarizing plate has a structure in which a retardation film is laminated on one surface of a polarizer and a polarizer.

In one embodiment of the present application, the polarizer is not particularly limited, and a polarizer well known in the art, for example, a film made of polyvinyl alcohol (PVA) containing iodine or dichroic dye is used.

The polarizer exhibits a characteristic that only light that vibrates in one direction can be extracted from light that is incident while vibrating in various directions. This property can be achieved by stretching polyvinyl alcohol (PVA) absorbing iodine with strong tension. For example, more specifically, swelling by swelling the PVA film in an aqueous solution, swelling with a dichroic material that imparts polarization to the swollen PVA film, and stretching the dyed PVA film ) To form a polarizer through a stretching step of arranging the dichroic dye materials side by side in a stretching direction, and a complementary color step of correcting the color of the PVA film that has undergone the stretching step. However, the polarizing plate of the present invention is not limited thereto.

In an exemplary embodiment of the present application, the polarizer and the retardation film may be adhered with an adhesive, and the usable adhesive is not particularly limited as long as it is known in the art. For example, there are water-based adhesives, one-part or two-part polyvinyl alcohol (PVA)-based adhesives, polyurethane-based adhesives, epoxy-based adhesives, styrene-butadiene rubber-based (SBR-based) adhesives, or hot melt adhesives, but the present invention It is not limited to these examples.

The retardation film may be directly attached to one or both sides of the polarizer. In addition, it is attached to the polarizing plate protective film of the conventional polarizing plate is a polarizing plate protective film is attached to both sides of the polarizer, it can be useful as a retardation film.

When the retardation film is directly attached to one or both surfaces of the polarizer, for example, the structure thereof may be an upper polarizing plate protective film/polarizer/phase difference film or a retarding film/polarizer/lower polarizing plate protective film. The attachment method is to apply a primer to the surface of the retardation film or polarizer using a roll coater, gravure coater, bar coater, knife coater, capillary coater, or micro chamber doctor blade coater, etc. , Sprinkling the adhesive in a dropwise manner, may be performed by a method of heating and laminating a laminate comprising a retardation film and a polarizer with a lamination roll, a method of laminating by pressing at room temperature, or a method of UV curing.

In one embodiment of the present application, the polarizing plate protective film is a COP (cycloolefin polymer) film, an acrylic film, a TAC (triacetylcellulose) film, a COC (cycloolefin copolymer) film, a PNB (polynorbornene) film, and a PET (polyethylene) terephtalate)-based film.

One embodiment of the present application, preparing a polarizing plate; Forming a polarizing plate protective film on one surface of the polarizing plate; And forming a pressure-sensitive adhesive layer on the opposite side of the surface of the polarizing plate where the polarizing plate protective film is in contact, after bonding the opposite side of the pressure-sensitive adhesive layer to the polarizing plate against the glass substrate. Provided is a method for producing a polarizing film having an initial adhesive strength of 100 gf/inch or less after standing at 23° C. for 2 hours, and a post-adhesive strength of 50 gf/inch or more after heat treatment at 50° C. for 20 minutes.

In one embodiment of the present application, after the step of forming the pressure-sensitive adhesive layer on the opposite surface of the polarizing plate protective film contacting surface of the polarizing plate, it provides a method of manufacturing a polarizing film further comprising a heat treatment step.

In one embodiment of the present application, the heat treatment step provides a method of manufacturing an adhesive film that is heat treated at a temperature condition of 35°C or more and 60°C or less.

In another exemplary embodiment, the heat treatment step may be 35°C or more and 60°C or less, preferably 40°C or more and 55°C or less.

The heat treatment step means heat treatment at a temperature condition of 35° C. or more and 60° C. or less, and the heat treatment step refers to a process of heat treatment using a chamber.

In one embodiment of the present application, the heat treatment step may be a condition for 20 to 50 minutes at the temperature.

When the heat treatment step is performed on the polarizing film, the adhesive strength of the surface contacting the polarizing plate and the pressure-sensitive adhesive layer is 600 gf/in or more and 1000 gf/in or less, and the adhesive strength is increased to improve the adhesion between the polarizing plate and the pressure-sensitive adhesive layer.

That is, the polarizing film according to an exemplary embodiment of the present application has a feature capable of manufacturing an integrated polarizing film in which a polarizer and an adhesive layer are laminated.

In one embodiment of the present application, the polarizing film according to the present application; And a display panel provided on a surface opposite to a surface of the pressure-sensitive adhesive layer that contacts the polarizing plate.

The display panel may be a glass display panel.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

< Manufacturing example >

1. Preparation of polarizing film

After coating the pressure-sensitive adhesive composition having the composition and parts by weight of Table 1 on the silicone release-treated PET film to a thickness of 25 μm, dried at a temperature of 120° C. for 3 minutes to prepare an adhesive layer. After drying, the polarizing plate was laminated on the pressure-sensitive adhesive layer, and then aged in a 40° C. oven for 1 day to enhance adhesion with the polarizing plate, thereby preparing a polarizing film of the polarizing plate/adhesive layer integrated type.

Adhesive composition composition (Meth)acrylate resin polymer Hardener
(DR-7030HD) Furtherance content Example 1 EHA/MMA/VP/HEA
(70/20/5/5) STA/STMA/FM-0721
(20/60/20)
(Tm: 39℃) 3 pt 0.7 pt Example 2 EHA/MMA/VP/HEA (70/20/5/5) STA/STMA/FM-0721
(20/60/20)
(Tm: 39℃) 5 pt 0.7 pt Example 3 EHA/MMA/VP/HEA (65/20/10/5) STA/STMA/FM-0721
(20/60/20)
(Tm: 39℃) 5 pt 0.7 pt Example 4 EHA/MMA/VP/HEA (65/20/10/5) STA/STMA/FM-0721
(10/70/20)
(Tm: 38℃) 5 pt 0.7 pt Example 5 EHA/MMA/VP/HEA (65/20/5/10) STA/STMA/FM-0721
(20/60/20)
(Tm: 39℃) 5 pt 0.7 pt Comparative Example 1 EHA/MMA/VP/HEA (70/20/5/5) - - 0.7 pt Comparative Example 2 EHA/MMA/VP/HEA (70/20/5/5) BYK-377 1 pt 0.7 pt

In Table 1, EHA is ethylhexyl acrylate, MMA is methyl methacrylate, VP is N-vinylpyrrolidone, HEA is hydroxyethyl acrylate, STA is stearyl acrylate, and STMA is stearyl methacrylate. It means each. In addition, FM-0721 was used as a monofunctional polysiloxane by Chisso, and FM-0721 is a (meth)acrylate in which polysiloxane is present.

In addition, the content of the polymer and curing agent is expressed based on 100 parts by weight of the (meth)acrylate-based resin.

With respect to the polarizing films of Examples 1 to 5 and Comparative Examples 1 and 2 prepared as described above, after attaching one surface of the adhesive layer of the polarizing film to Glass, the adhesive strength and reworkability were evaluated under specific temperature conditions, and as a result, Was as shown in Table 2 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Initial adhesion (gf/in) 32 24 28 29 31 1500 25 Medium-term adhesion (gf/in) 35 30 28 30 30 1550 27 Late adhesion (gf/in) 1520 1480 1350 1380 1400 1630 26 Reworkability OK OK OK OK OK NG OK

1. Initial adhesive strength: The adhesive layer is reciprocated once with a 2kg rubber roller, attached to a glass substrate and left at 23°C for 2 hours, and then texture analyser (Texture analyzer (Stable Micro Systems) at 180° angle and peeling speed of 1800mm/min. G).

2. Medium adhesive force: The adhesive layer is reciprocated once with a 2kg rubber roller, attached to a glass substrate, left at 23°C for 24 hours, and then texture analyser (Texture analyzer (Stable Micro Systems) at a 180° angle and a peeling rate of 1800mm/min. G).

3. Late adhesion: The adhesive layer is reciprocated once with a 2 kg rubber roller, attached to a glass substrate, left at 23° C. for 24 hours, heat treated at 50° C. for 20 minutes, and then textured by a 180° angle and a peeling rate of 1800 mm/min. It was measured using a riser (Texture analyzer (Stable Micro Systems)).

4. Reworkability: The adhesive layer was attached to the glass substrate, and after 10 minutes, when peeling off, the adhesive remained on the glass substrate.

As can be seen from Table 2, in the case of the polarizing films of Examples 1 to 5 of the present application, it can be confirmed that the initial adhesive strength and the intermediate adhesive strength are kept low, which is stable over time to prevent an increase in adhesive strength at room temperature (25°C). This excellence was confirmed. In addition, it was confirmed that the post-adhesive power surged over a specific range, which confirmed that the polarizing films of Examples 1 to 5 of the present application had excellent variability, and thus excellent reworkability in case of incorrect adhesion.

In the case of Comparative Example 1, the adhesive composition did not include a polymer having a specific melting temperature range, and the initial adhesive strength was high, so it was confirmed that the adhesive residue remained when misadhesive and the reworkability was poor. In the case of 2, it contains a polymer other than a polymer having a specific melting temperature range, and the initial adhesive strength is kept low, so reworkability is excellent, but the late adhesive strength is also kept low, so that the variable properties do not occur, and thus the adhesive strength does not increase. I could confirm that I had it.

10: Polarizing plate protective film
20: polarizer
30: adhesive layer
40: polarizing film

Claims (17)

Polarizer;
A polarizing plate protective film provided on one surface of the polarizing plate; And
An adhesive layer provided on a surface opposite to a surface of the polarizing plate on which the polarizing plate protective film is in contact;
As a polarizing film containing,
The adhesive strength of the adhesive layer is less than 100 gf/inch at a temperature of 23° C. for 2 hours after bonding the opposite surface of the pressure-sensitive adhesive layer to the glass substrate. Polarizing film that is more than inch. The method according to claim 1,
The adhesive force of the surface of the pressure-sensitive adhesive layer contacting the polarizing plate is 600 gf/in or more and 1000 gf/in or less. The method according to claim 1,
The pressure-sensitive adhesive layer comprises an adhesive composition or a cured product thereof,
The pressure-sensitive adhesive composition is a (meth)acrylate-based resin; A polymer having a melting temperature (Tm) of 35°C or higher; And a curing agent,
The polymer is a polarizing film that is a copolymer of a monofunctional polysiloxane and one or more monomers. The method according to claim 3,
The monomer is a polarizing film represented by the following formula (1):
[Formula 1]

In Chemical Formula 1,
X is N or O,
R ₁ is hydrogen or a methyl group,
n is an integer from 10 to 30. The method according to claim 4,
The polarizing film in which n is an integer of 16 to 22. The method according to claim 3,
The polymer having a melting temperature of 35°C or higher is based on 100 parts by weight of the polymer having a melting temperature of 35°C or higher,
10 parts by weight or more and 40 parts by weight or less of the monofunctional polysiloxane, and
A polarizing film comprising 60 parts by weight or more and 90 parts by weight or less of the monomer. The method according to claim 3,
The pressure-sensitive adhesive composition is based on 100 parts by weight of (meth)acrylate-based resin,
A polarizing film comprising 1 to 10 parts by weight of the polymer having a melting temperature of 35°C or higher. The method according to claim 4,
The monomer represented by Formula 1 is a polarizing film that is at least one selected from the group consisting of STA (Stearyl acrylate) and STMA (Stearyl methacrylate). The method according to claim 3, wherein the pressure-sensitive adhesive composition is a polarizing film further comprises at least one selected from the group consisting of a solvent, a dispersing agent, a photoinitiator, a thermal initiator and a tackifier. The method according to claim 1, The thickness of the pressure-sensitive adhesive layer is 3 ㎛ or more 100 ㎛ The following polarizing film. The method according to claim 1,
The polarizing film further comprises a release film on the opposite surface of the pressure-sensitive adhesive layer in contact with the polarizing plate. The polarizing film of claim 1, wherein the late adhesive force/the initial adhesive force is 1.2 or more and 500 or less. The method according to claim 1, After bonding the opposite side of the surface of the pressure-sensitive adhesive layer contacting the polarizing plate with respect to the glass substrate,
The initial adhesive strength after standing at 23° C. for 2 hours is 100 gf/inch or less,
The polarizing film whose medium-term adhesion after standing at 23° C. for 24 hours is 110 gf/inch or less. Preparing a polarizing plate;
Forming a polarizing plate protective film on one surface of the polarizing plate; And
Forming an adhesive layer on a surface opposite to a surface of the polarizing plate where the polarizing plate protective film is in contact;
As a manufacturing method of a polarizing film containing,
The adhesive strength of the adhesive layer is less than 100 gf/inch at a temperature of 23° C. for 2 hours after bonding the opposite surface of the pressure-sensitive adhesive layer to the glass substrate. Method of manufacturing a polarizing film that is more than inch. The method according to claim 14,
After the step of forming the pressure-sensitive adhesive layer on the opposite surface of the polarizing plate protective film contacting surface of the polarizing plate, the method of manufacturing a polarizing film further comprising a heat treatment step. The method according to claim 15,
The heat treatment step is a method of manufacturing a polarizing film that is heat-treated at a temperature condition of 35 ℃ or more and 60 ℃ or less. The polarizing film according to any one of claims 1 to 13; And
A display panel provided on a surface opposite to the surface of the pressure-sensitive adhesive layer in contact with the polarizing plate;
A liquid crystal display device comprising a.

Images