KR20160129345A - Polarizer protecting film and polarizer plate comprising the same and method for manufacturing the polarizer plate - Google Patents

Polarizer protecting film and polarizer plate comprising the same and method for manufacturing the polarizer plate Download PDF

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Publication number
KR20160129345A
KR20160129345A KR1020150061346A KR20150061346A KR20160129345A KR 20160129345 A KR20160129345 A KR 20160129345A KR 1020150061346 A KR1020150061346 A KR 1020150061346A KR 20150061346 A KR20150061346 A KR 20150061346A KR 20160129345 A KR20160129345 A KR 20160129345A
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South Korea
Prior art keywords
protective film
polarizer
polarizer protective
resin
film
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KR1020150061346A
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Korean (ko)
Inventor
이정균
김진우
배창석
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삼성에스디아이 주식회사
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Priority to KR1020150061346A priority Critical patent/KR20160129345A/en
Priority to PCT/KR2016/004511 priority patent/WO2016175601A1/en
Publication of KR20160129345A publication Critical patent/KR20160129345A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid

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  • Polarising Elements (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

A polarizer protective film, a polarizer including the polarizer protective film, and a method for producing the polarizer. The polarizer protective film comprises an acrylic resin, and at least one resin selected from the group consisting of silica, a silicone resin, and a siloxane resin, and the glass transition temperature may be in a range of 50 캜 to 115 캜.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a polarizer protective film, a polarizer including the polarizer protective film, and a method of manufacturing the polarizer.

The present invention relates to a polarizer protective film, a polarizing plate, and a method for producing a polarizing plate.

On the other hand, a liquid crystal display device or an organic light emitting device (electro luminescence) optically modulates transmitted light according to an input image signal or self-emits a luminance pixel corresponding to an image signal, thereby obtaining gradation for each pixel. The layer for modulating the transmitted light or the light emission luminance for each pixel is referred to as a modulation function layer. In the liquid crystal display device, the liquid crystal layer corresponds to the modulation function layer, and in the organic light emitting element, the organic EL light emission layer corresponds to the modulation function layer.

Since the liquid crystal layer itself is not a light valve that completely blocks light, a polarizing plate may be disposed on both sides in the vertical direction of both liquid crystal layers in the vertical direction of the liquid crystal layer, that is, on the backlight side and the viewer side of the viewer have.

On the other hand, since the light emitting layer of the organic light emitting device does not irradiate light when no voltage is applied, it is possible to display a full black color and provide a relatively high contrast as compared with a liquid crystal display device. Therefore, the organic light emitting element does not arrange the polarizer for the purpose of shielding the light emission. However, in the organic light emitting device, the external light can be reflected by the metal wiring therein, which causes a decrease in contrast. Therefore, a polarizing plate is disposed to prevent this.

The polarizing plate may be composed of a polarizing plate protective film attached to protect the polarizing film and the polarizing film in which iodine or a dichroic dye is adhered and oriented. The polarizing plate protective film prevents iodine or dichromic dye dyed on the polarizing film from escaping to the outside and prevents penetration of moisture and the like.

Accordingly, it is an object of the present invention to provide a polarizer protective film excellent in adhesion to a polarizer and a polarizer including the polarizer protective film.

It is another object of the present invention to provide a method for producing a polarizing plate which is easy to manufacture.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing the same.

According to an aspect of the present invention, there is provided a polarizer protective film comprising at least one resin selected from the group consisting of an acrylic resin, silica, a silicone resin and a siloxane resin, and has a glass transition temperature .

The acrylic resin may be at least one selected from the group consisting of methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, trimethyl From the group consisting of propane trimethacrylate, pentaerythritol triacrylate, polyester acrylate, polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate and silicone acrylate And may include at least one selected.

In addition, the siloxane-based resin may include polydimethylsiloxane.

Also, at least one of the silica, the silicone resin, and the siloxane resin may be contained in an amount of more than 0 wt% to 5 wt% with respect to the total amount of the polarizer protective film.

In addition, the thickness of the polarizer protective film may be in the range of 15 탆 to 50 탆.

According to an aspect of the present invention, there is provided a polarizer comprising a polarizer, a polarizer protective film disposed on at least one surface of the polarizer, and an adhesive layer disposed between the polarizer and the polarizer protective film, The protective film includes an acrylic resin, and at least one resin selected from the group consisting of silica, a silicone resin, and a siloxane resin, and the glass transition temperature may be in a range of 50 캜 to 115 캜.

Further, the adhesive layer may include an aqueous adhesive.

In addition, the polarizer protective film may be directly attached to the polarizer through the adhesive layer.

The glass transition temperature of the polarizer protective film may be in the range of 75 캜 to 105 캜.

The glass transition temperature of the polarizer protective film may be in the range of 85 ° C to 100 ° C.

The polarizer protective film may include a functional layer disposed on the opposite side of the surface on which the adhesive layer is formed. The functional layer may include a hard-coating layer, an anti-reflection layer, Anti-Glare Layer), or a diffusion layer.

According to an aspect of the present invention, there is provided a method of manufacturing a polarizing plate, the method including the steps of: preparing a polarizing plate having a glass transition temperature of 50 ° C to 115 ° C, and at least one resin selected from the group consisting of acrylic resin, silica, silicone resin and siloxane resin; A step of preparing a polarizer protective film, a step of performing a surface treatment by subjecting one surface of the polarizer protective film to a corona treatment or a plasma treatment, and a step of applying an adhesive layer between one surface of the polarizer protective film and the polarizer, .

Further, the adhesive layer may include an aqueous adhesive.

The polarizer protective film may be in direct contact with the adhesive layer.

The step of preparing the polarizer protective film may comprise the steps of: casting a base film, a solution containing at least one resin selected from the group consisting of silica, silicone resin and siloxane resin on at least one surface of the base film, Drying the cast film, and peeling the base film to obtain a polarizer protective film.

The details of other embodiments are included in the detailed description and drawings.

The embodiments of the present invention have at least the following effects.

The polarizer protective film of the present invention is excellent in adhesion to a polarizer, and the polarizer of the present invention may include a polarizer protective film as described above.

In addition, the polarizing plate manufacturing method of the present invention can be easily manufactured.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a perspective view of a polarizer protective film according to an embodiment of the present invention.
2 is a perspective view of a polarizer according to an embodiment of the present invention.
3 is a perspective view of a polarizer according to another embodiment of the present invention.
4 is a perspective view of a polarizer according to another embodiment of the present invention.
5 and 6 are views schematically showing a process of manufacturing a polarizer protective film according to an embodiment of the present invention.
7 is a perspective view schematically showing a surface treatment process of a polarizer protective film according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Elements or layers are referred to as being " on "other elements or layers, including all other layers or other elements just above or in between. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

It should also be understood that the steps constituting the manufacturing method described herein may be sequential or sequential, or one step and the other step constituting one manufacturing method may be performed in the order described in the specification It is not construed as limited. Therefore, the order of the steps of the manufacturing method can be changed within a range that can be easily understood by a person skilled in the art, and a change apparent to a person skilled in the art accompanying thereto is included in the scope of the present invention.

Polarizer protective film

1 is a perspective view of a polarizer protective film according to an embodiment of the present invention. Referring to FIG. 1, the polarizer protective film 10 according to an embodiment of the present invention may include at least one of acrylic resin, silica, silicone resin, and siloxane resin.

Further, the glass transition temperature of the polarizer protective film 10 may be in the range of 50 캜 to 115 캜. The glass transition temperature of the polarizer protective film 10 may be, for example, in the range of 75 占 폚 to 105 占 폚, or in a range of 85 占 폚 or more and less than 100 占 폚. It is possible to use a low-priced UV absorbent which can be used at a low temperature in the range of the glass transition temperature. Further, the polarizer protective film 10 can be formed even at a low temperature.

The acrylic resin may be at least one selected from the group consisting of methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, Selected from the group consisting of trimethylolpropane triacrylate, trimethacrylate, pentaerythritol triacrylate, polyester acrylate, polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate and silicone acrylate. For example, the acrylic resin may be contained in the polarizing plate protective film 10 in an amount of 90 wt% or more to less than 100 wt%.

In addition, the silica may be contained in the polarizer protective film in the form of a gel in the form of a gel. By including the silica and / or the silicone resin, the polarizer protective film 10 of the present invention can improve the adhesive force with the polarizer, which will be described later, and can be bonded to the polarizer even without an additional primer layer alone. More specifically, adhesion can be achieved by using an aqueous adhesive between the polarizer protective film and the polarizer, and improving the adhesive force even by using a corona treatment or a plasma treatment without using a separate primer layer.

In addition, the siloxane-based resin may include polydimethylsiloxane. By incorporating the siloxane-based resin, the polarizer protective film 10 of the present invention can improve adhesion to a polarizer, which will be described later, and can be bonded to a polarizer even without an additional primer layer alone. For example, adhesion can be achieved by using a water-based adhesive between the polarizer protective film and the polarizer, and improving the adhesion even with a corona treatment or a plasma treatment without using a separate primer layer.

At least one of the silica, the silicone resin, and the siloxane resin may be contained in an amount of more than 0 wt% to 5 wt% with respect to the total amount of the polarizer protective film (10). If the content of the resin exceeds 5% by weight, the scattering of light may cause a decrease in luminance or a decrease in color, resulting in lowering the overall CR (contrast ratio) of the display device or lowering the viewing angle.

On the other hand, the polarizer protective film 10 may include a UV screening agent, and examples of the UV screening agent include 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-methoxy- Benzophenone compounds such as benzophenone and the like, benzotriazole compounds such as 2- (2'-hydroxy-5-methylphenyl) benzotriazole and the like, hindered phenols such as phenyesarsylate and pt-biphenylsulfate An amine type, and the like.

Polarizer

2 is a perspective view of a polarizer according to an embodiment of the present invention. 2, a polarizer according to an embodiment of the present invention includes a polarizer 20, a polarizer protective film 10 disposed on at least one surface of the polarizer 20, And an adhesive layer 15 disposed between the protective films 10. The polarizer protective film 10 may include at least one resin selected from the group consisting of acrylic resin, silica, silicone resin and siloxane resin, and the glass transition temperature may be in the range of 50 to 115 ° C. On the other hand, the components constituting the polarizer protective film 10 and the glass transition temperature thereof have already been described above, and a repeated description thereof will be omitted.

The polarizer 20 may include a polyvinyl alcohol-based film in which iodine or a dichroic dye is oriented in a wrinkled orientation.

As a method for producing the polarizer 20, a polyvinyl alcohol-based film may be subjected to a step of dyeing, crosslinking, and stretching. The iodine or dichroic substance may be adsorbed and oriented in the polyvinyl alcohol-based film, and the iodine, dye or pigment molecule absorbs the light oscillating in the stretching direction of the polarizing film, and the light oscillating in the vertical direction is transmitted Polarized light having a specific vibration direction can be obtained.

The polarizer 20 may be manufactured through the steps of dying, crosslinking, or stretching the polyvinyl alcohol film alone, but it may be manufactured by laminating a polyvinyl alcohol film on a base film and then performing the above-described process. When a polarizer is produced by laminating with a base film, it is possible to manufacture a thinner polarizer while preventing the polyvinyl alcohol film from being judged in the course of drawing or the like. On the other hand, examples of the base film include films of polycarbonate, polyacrylate, polyethylene terephthalate, polyethylene, triacetylcellulose, polystyrene, polyimide, polypropylene, cycloolefin, polyurethane But are not limited to, resins.

The step of saponification may be carried out by a polyvinyl alcohol-based film or a polyvinyl alcohol-based film formed by laminating a base film on a substrate to form a laminated film, followed by impregnation with a solution of iodine or a dichroic substance. For example, the temperature of the iodine solution may be in the range of 20 ° C to 50 ° C, and the duration of the iodine solution may be in the range of 10 to 300 seconds. When an iodine solution is used as the iodine solution, an aqueous solution containing iodine (I 2 ) and iodide ions, for example, potassium iodide (KI) used as a solubilizing agent may be used. In an exemplary embodiment, the concentration of iodine (I 2 ) ranges from 0.01 to 0.5 wt% based on the total weight of the aqueous solution, and the concentration of potassium iodide (KI) ranges from 0.01 to 10 wt% based on the total weight of the aqueous solution have.

In an exemplary embodiment, the swelling step may be further included prior to carrying out the solidifying step. The swelling step may soften the molecular chains of the polyvinyl alcohol-based film and loosen the molecular chains so that the dichroic materials are homogeneously dyed in the polyvinyl alcohol-based film during the dyeing process, have. In this swelling process, the polyvinyl alcohol film may be stretched. In an exemplary embodiment, it may be carried out in a wet process in a swelling tank containing a swelling liquid. In addition, the swelling temperature may vary depending on the film thickness and the like, and may range, for example, from 15 캜 to 40 캜.

In another exemplary embodiment, the bridging step may further comprise a bridging step.

When the molecules of iodine or dichroic substance are dyed on the polyvinyl alcohol film in the step of salt-adsorption, the dichroic molecules are adsorbed on the polymer matrix of the polyvinyl alcohol-based film by using boric acid, borate, or the like. Examples of the crosslinking method include a deposition method in which a polyvinyl alcohol-based film is immersed in an aqueous solution of boric acid or the like, but the present invention is not limited thereto. The crosslinking method may be carried out by a coating method or a spraying method, It is possible.

On the other hand, in the step of stretching, the polyvinyl alcohol-based film may be subjected to a wet stretching method and / or a dry stretching method common to those skilled in the art.

Examples of the dry stretching method include inter-roll stretching method, heating roll stretching method, compression stretching method, tenter stretching method, and the like, and the wet stretching method Non-limiting examples include a tenter stretching method and a roll-to-roll stretching method.

In the case of the wet drawing method, drawing can be performed in an alcohol, water, or boric acid aqueous solution. For example, solvents such as methyl alcohol and propyl alcohol may be used, but the present invention is not limited thereto.

The stretching temperature and time may be appropriately selected depending on the material of the film, the desired elongation, the method of use, and the like. The stretching step may be uniaxial stretching or biaxial stretching. In order to produce a polarizing film to be adhered to a liquid crystal cell, biaxial stretching may be performed so as to realize a retardation property.

The order of the salt-drawing step and the step of stretching need not always be the same, but the order may be appropriately selected depending on the processing equipment and equipment, and in some cases, the step of stretching may be carried out in the step of salt- Process can be carried out at the same time. When the stretching step is carried out simultaneously with the salt-washing step, the stretching step may be carried out in the iodine solution. On the other hand, if the stretching step proceeds simultaneously with the crosslinking step, the stretching step may be carried out in an aqueous solution of boric acid.

In the case of using a base film, the base film may be removed to obtain a polyvinyl alcohol-based film in which iodine or a dichroic dye is oriented in a rosewood orientation. The polyvinyl alcohol- . The base film may be adhered to the polyvinyl alcohol-based film with a certain adhesive force, and a peeling force higher than a predetermined force may be applied to remove the base film.

The steps of producing the above-described polarizer are illustrative, and various methods used in the art as a method of manufacturing the polarizer are applicable, and are not limited thereto.

On the other hand, the polarizer protective film 10 may be disposed on at least one surface of the polarizer 20. [ When the polarizer protective film 10 is disposed on only one side of the polarizer 20 as in the polarizer of Fig. 2, a thinner polarizer can be produced.

The polarizing plate may include an adhesive layer 15 disposed between the polarizer 20 and the polarizer protective film 10. The adhesive layer 15 may include an aqueous adhesive agent but is not limited thereto, Adhesives.

The water-based adhesive may include at least one selected from the group consisting of a polyvinyl alcohol-based resin and a vinyl acetate-based resin, or may include a polyvinyl alcohol-based resin having a hydroxyl group, but is not limited thereto.

The ultraviolet curable adhesive may include an acrylic compound, for example, acrylic, urethane-acrylic, or epoxy. However, the present invention is not limited thereto.

On the other hand, in the case where the adhesive layer 15 includes an aqueous adhesive, in order to improve the adhesive strength of the polarizer protective film 10 comprising an acrylic resin and the polarizer 20 comprising a polyvinyl alcohol film, 10 may be subjected to a corona treatment or a plasma treatment. The surface CA of the polarizer protective film 10 contacting the adhesive layer 15 may have a lower contact angle than the surface NCA of the polarizer protective film 10 not contacting the adhesive layer 15, And the polarizer 20 can be excellent.

In the case of the polarizer protective film 10 according to the present invention, at least one resin selected from the group consisting of silica, a silicone resin and a siloxane resin is contained, so that the adhesive layer 15 including an aqueous adhesive can form a polarizer- The polarizer 20 can be adhered to the substrate 10.

On the other hand, the polarizer protective film 10 can be directly attached to the polarizer 20 via the adhesive layer 15. That is, as mentioned above, the adhesive layer 15 may be attached between the polarizer protective film 10 and the polarizer 20 without a separate primer layer. In other words, the adhesive layer 15 directly contacts the other surface of the polarizer protective film 10, and the adhesive layer 15 directly contacts the polarizer protective film 10 of the polarizer 20, You can be in touch.

However, the present invention is not limited to the above, and the polarizing plate of the present invention may further include a separate primer layer (not shown) between the polarizer protective film 10 and the polarizer 20 in order to improve the adhesion. The primer layer may be formed by applying a coating solution containing a water-dispersible polymer resin, water-dispersible fine particles and water on a protective film using a bar coating method, a gravure coating method, and the like, followed by drying.

3 is a perspective view of a polarizer according to another embodiment of the present invention. Referring to FIG. 3, the polarizing plate may further include a functional layer 40 disposed on one side of the polarizer protective film 10. That is, the functional layer 40 may be disposed on the opposite side of the surface of the polarizer protective film 10 on which the adhesive layer 15 is formed.

The functional layer 40 may include a hard-coating layer, an anti-reflection layer, an anti-glare layer, or a diffusion layer, but is not limited thereto. And may include various known functional layers. For example, the antireflection layer can reduce the reflection of light incident from the outside, and the anti-glare layer can prevent the glare by inducing diffusion and reflection of light incident from the outside.

2 and 3, when the polarizer protective film 10 is disposed on only one side of the polarizer 20, an adhesive layer may be disposed on the other side of the polarizer 20, And can be attached to the display panel. In addition, a release film may be attached to the other surface of the adhesive layer to facilitate storage and transportation of the polarizer.

4 is a perspective view of a polarizing plate according to another embodiment of the present invention. 4, the polarizing plate may include polarizer protective films 10 and 30 disposed on both sides of the polarizer 20. In this case, adhesive layers 15 and 25 are disposed on both sides of the polarizer 20 Lt; / RTI > The adhesive layers 15 and 25 can be in direct contact with the polarizer 20 or in direct contact with the polarizer protective films 10 and 30.

As described above, the polarizing plate of the present invention can achieve excellent adhesion between the polarizer and the polarizer protective film even if a separate primer layer is omitted, so that an expensive primer layer can be avoided and a thin polarizing plate can be manufactured .

Referring again to FIG. 2, the thickness T of the polarizer protective film 10 may be in the range of 15 to 50 占 퐉. When the above range is satisfied, a thinner polarizing plate can be realized.

Polarizing plate manufacturing method

The present invention provides a polarizing plate manufacturing method, wherein a polarizing plate manufacturing method according to an embodiment of the present invention comprises an acrylic resin and at least one resin selected from the group consisting of silica, a silicone resin and a siloxane resin and has a glass transition temperature of 50 to 115 A step of preparing a polarizer protective film having a thickness in the range of 1 to 20 占 폚, a step of treating the surface of the polarizer protective film by a corona treatment or a plasma treatment, and a step of applying an adhesive layer between one surface of the polarizer protective film and the polarizer And then interlaced.

The polarizing plate manufacturing method may include preparing a polarizing protective film, and the polarizing protecting film may include the polarizing protective film 10 of the present invention described above.

5 and 6, a polarizer protective film is prepared according to a method of manufacturing a polarizer protective film of the present invention. Referring to FIGS. 5 and 6, And a step of casting a solution containing a silicone-based resin or a siloxane-based resin. The casting step is, as a non-limiting example, the casting apparatus 100 as shown in Fig. 5 can be used.

5, a solution containing at least one of acrylic resin, silica, silicone resin, and siloxane resin is supplied to the discharging device 120 through the raw material input part 110 of the casting device 100 .

The acrylic resin may be at least one selected from the group consisting of methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, Triacrylate, polyacrylate, epoxy acrylate, polyester acrylate, melamine acrylate, silicone acrylate, and 2,2,4-trimethylolpropane triacrylate. (2,2,4-trimethyl-hexane-diisocyanate), and the like.

On the other hand, the solution may contain a photoinitiator for ultraviolet curing. The photoinitiator may be a radical polymerization initiator such as an acetophenone-based initiator or a cationic polymerization initiator such as an aromatic diazonium salt or an aromatic sulfonium salt, either singly or in combination However, the present invention is not limited thereto.

The solution may also include a cross-linking agent, which may include, but is not limited to, tolylene diisocyanate, hexamethylene diisocyanate or ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether .

Further, it may further include a solvent and an additive, an ultraviolet screening agent, and the like, which are well known in the art, and a detailed description thereof will be omitted. The above-described silica, silicone resin and siloxane-based resin have already been described in the above polarizer protective film, but a duplicate description will be omitted.

Also, as described above, the solution may comprise silica and may comprise silica gel in the form of a gel. Further, the solution may include a silicone-based resin.

The siloxane-based resin may include a polyether-modified polydimethylsiloxane, and may include, for example, polydimethylsiloxane. That is, the polyether-modified siloxane may have a structure in which the polyether chain is substituted with polyethylene oxide or polypropylene oxide.

The siloxane-based resin may be prepared by hydrolysis of a silane compound followed by dehydration condensation polymerization, and an acid catalyst such as nitric acid, hydrochloric acid, sulfuric acid or acetic acid may be used for the hydrolysis and dehydration condensation reaction.

Specific examples of the silane compound include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetraisopropoxysilane, tetra-n-butoxysilane, tetra-sec-butoxysilane, tetra- But are not limited to, trimethylsilane, trimethoxysilane, trimethoxysilane, trimethoxysilane, triethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, Vinyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, allyltrimethoxysilane allyltriethoxysilane, dimethyldimethoxy silane, dimethyltrimethoxysilane, dimethyltrimethoxysilane, vinyltrimethoxysilane, vinyltrimethoxysilane, Silane, dimethyldiethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane. However, the present invention is not limited thereto.

For example, the weight average molecular weight of the siloxane-based resin may be in the range of 1,000 to 100,000 or in the range of 5,000 to 20,000. The siloxane-based resin may be produced by hydrolysis and decarboxylation of the silane compound. When the weight average molecular weight is 1000 or more, the polymer has a low refractive index and is super hydrophilic. Thus, the adhesion between the polarizer protective film and the polarizer can be improved. When the molecular weight exceeds 100000, It is because.

The solution injected into the discharging device 120 is discharged onto the base film 200 which is traveling in a specific direction under the casting device 100. The discharging process can be uniformly discharged onto the base film 200 by the discharging part 130 such as a nozzle having a narrow entrance, thereby casting the solution. Thus, the above-described composition Can be uniformly cast.

5 shows a method of dropping a solution containing an acrylic resin and a silicone resin or a siloxane-based resin from the discharging portion 130 of the casting apparatus 100 at a uniform speed in the specific direction of the base film 200 However, the present invention is not limited to this. The base film may be in a stationary state, and the casting apparatus 100 itself may be moved at a constant speed and the solution may be discharged.

As the base film 200, a known plastic film, glass, or the like can be used. For example, a polyethylene terephthalate film, a triacetylcellulose film, a polyarylate film, a polyimide film, a polyether film, a polycarbonate film, A polysulfone film, a polyether sulfone film, and the like can be used, but the present invention is not limited thereto.

Next, as shown in FIG. 6, it may include a step of drying a solution containing at least one resin selected from the group consisting of silica-based resin, silicone-based resin and siloxane-based resin cast on the base film 200, The solvent is evaporated, and the polarizer protective film 10 can be produced on the base film 200. The drying step may be performed by the drying apparatus 300, and the drying step may be performed by heat curing or UV curing. However, the present invention is not limited thereto.

Next, the step of peeling the base film (200) to obtain the polarizer protective film (10) may be included. As a non-limiting example, as shown in FIG. 6, in a state in which the polarizer protective film 10 dried by the drying step is laminated on the base film 200, the base film 200 is rotated on the rotation of the roll 400 And the polarizer protective film 10 can be obtained by separating in the downward direction by gravity. However, the present invention is not limited thereto.

The glass transition temperature of the polarizer protective film 10 produced in the above manner may be in the range of 50 to 115 ° C, for example, in the range of 75 to 105 ° C, or in the range of 85 to 100 ° C.

7 is a schematic view illustrating a process of processing the surface of one side of the polarizer protective film 10 according to an embodiment of the present invention. Referring to FIG. 7, a step of corona treatment or plasma treatment may be performed on the surface of one side of the polarizer protective film 10 manufactured by the above casting method.

More specifically, the corona treatment or the plasma treatment (ST) is performed on one surface of the polarizer protective film 10, that is, the surface CA on which the adhesive layer is disposed later, thereby improving the adhesion to the polarizer. In addition, since the contact angle of the one surface CA of the polarizer protective film 10 on which the adhesive layer is disposed is lower than that of the other surface NCA by the surface treatment step as described above, the adhesive layer can be formed more easily, The polarizer protective film can be easily adhered to the polarizer by the adhesive layer.

The corona treatment may be performed once, for example, with an intensity of 800 dose. The dose is a value calculated by the following formula (1).

dose = (max generator power of corona processor) / (film processing speed x electrode length x treated water) Equation 1

More specifically, for example, when the max generator power of the corona processor is 4000 Watt, the film processing speed is 100 m / min, the length of the electrode rod is 1600 mm, and the treatment number is twice, dose = (4000 ) / (100 x 1.6 x 2), a value of 12.5 W min / m 2 is obtained.

The adhesive layer may include an aqueous adhesive, but is not limited thereto, and may include an ultraviolet curable adhesive layer. As described above, the overlapping description will be omitted.

Display device

Although not shown separately, according to the present invention, a display device including the above-described polarizer can be provided.

The display device may include a display panel and a polarizing plate disposed on at least one surface of the display panel. That is, the polarizing plate of the present invention may be disposed on one side or both sides of the display panel. For example, when the display device is a liquid crystal display device, the polarizing plate may be disposed on both sides of the liquid crystal display device display panel. When the polarizing plate is a polarizing plate including a functional layer, the polarizing plate may be disposed on the viewer side of the display panel. In addition, when the display device is an organic light emitting display device, the polarizing plate may be disposed only on the viewing side of the display panel, which will be described in more detail below.

When the display device is a liquid crystal display device, the display panel constituting the display device may be a liquid crystal cell. In this case, the display device may further include a backlight unit. In the case of a display device including a liquid crystal cell, a separate backlight unit is required because there is no separate light source in comparison with the OELD panel.

The liquid crystal cell typically includes two substrates and a liquid crystal layer disposed between the substrates. One of the substrates is generally provided with a color filter, an opposing electrode, and an alignment film. An electrode, a wiring pattern, a thin film transistor element, an alignment film, and the like.

The operation mode of the liquid crystal cell may be, for example, a twisted nematic mode or an electrically controlled birefringence mode. The birefringence control mode may include a vertical alignment method, an OCB (Optically Compensated) method, and an IPS (In-Plane Switching) method.

Meanwhile, the backlight unit may generally include a light source, a light guide plate, and a reflective film. Depending on the configuration of the backlight, it can be arbitrarily divided into a direct-down system, a sidelight system, and a planar light source system.

When the display panel is constituted by a liquid crystal cell, the polarizing plate may be formed on both sides of the liquid crystal cell. In this case, the polarizing plate can transmit only the light that vibrates in a specific direction among the light incident from the light source of the backlight unit.

Further, the polarizing plate may be included at a position opposite to the backlight unit of the liquid crystal cell. In this case, it may be located on the surface of the display panel, but the present invention is not limited thereto, and may be a form placed between other components of the display device. That is, when the liquid crystal cell is arranged with the transmission axis interposed therebetween, the transmission axes of the upper polarizing film and the lower polarizing film may be orthogonal or parallel.

As a non-limiting example, the display panel may be formed of a flexible material.

The display device may further include a retardation film disposed between the polarizing plate and the display panel. The retardation film compensates the phase difference of light by a desired value to improve a viewing angle, a contrast ratio, a color characteristic, A retardation film having a retardation value required by a person skilled in the art can be applied. Also, as the retardation film, a film having an inverse wavelength dispersion characteristic may be used to improve anti-reflection characteristics. The retardation film is widely known in the art, and a detailed description thereof will be omitted.

On the other hand, when the display device is an organic light emitting display device, the display panel constituting the display device may include an OLED (Organic Light-Emitting Diode) panel. The OLED panel may include respective pixels, and each of the pixels may include an OLED composed of an organic light emitting layer between an anode and a cathode, and a pixel circuit that independently drives the OLED. The pixel circuit may mainly include a switching thin film transistor (TFT), a capacitor, and a driving TFT. The switching thin film transistor charges a data voltage in a capacitor in response to a scan pulse, and the driving TFT controls an amount of current supplied to the OLED according to a data voltage charged in the capacitor, thereby adjusting an amount of light emitted from the OLED, Can be displayed. On the other hand, OLED panels are well known in the related art and will not be described in detail.

The polarizer may be disposed on the viewer side of the OLED panel. That is, the polarizer may be attached to the side where the viewer observes the image displayed from the OLED panel. Therefore, it is possible to prevent a decrease in contrast caused by reflection of external light.

Hereinafter, the present invention will be described with reference to concrete experimental data.

Example 1

A protective film comprising polydimethylsiloxane and 2,2,4-trimethyl-hexane-diisocyanate was prepared, and a polarizer and the above-prepared protective film were attached. A polarizing plate was prepared by adhering with a water-based adhesive only a corona treatment without attaching a separate primer layer to the protective film.

Example 2

A protective film containing silica gel and 2,2,4-trimethyl-hexane-diisocyanate was prepared, and a polarizer and the above-prepared protective film were attached. For the attachment of the protective film, only a corona treatment was performed without using a separate primer layer, and the adhesive was adhered using an aqueous adhesive.

Comparative Example 1

A polarizing plate was prepared in the same manner as in Example 1 except that the corona treatment was not performed.

Comparative Example 2

A polarizing plate was prepared in the same manner as in Example 2 except that the corona treatment was not performed.

Experimental Example 1

The glass transition temperatures of the protective films of Examples 1 and 2 were measured. The glass transition temperature of Example 1 was measured at 90.252 ° C, and the glass transition temperature of Example 2 was measured at 102 ° C.

Experimental Example 2

The polarizing plates of Examples 1 and 2 and Comparative Examples 1 and 2 were tested to remove the protective film. In the case of Examples 1 and 2, breakage occurred in the process of removing the protective film, and in Comparative Examples 1 and 2, peeling was easily occurred. According to the above results, it was confirmed that the adhesion between the polarizer and the protective film was excellent only by the corona treatment even when the protective film and the polarizer were attached using an aqueous adhesive without a separate primer layer in Examples 1 and 2 according to the present invention .

It will be appreciated that the embodiments described above are all exemplary and that different embodiments may be applied in combination.

10, 30: polarizer protective film
15, 25: Adhesive layer
20: Polarizer
40: functional layer
100: casting device
110: Feedstock
120: Discharging device
130:
200: substrate film
300: Drying device
400: roll

Claims (15)

Acrylic resin; And
Silica, a silicone-based resin, and a siloxane-based resin,
A polarizer protective film having a glass transition temperature in the range of 50 캜 to 115 캜 The method according to claim 1,
The acrylic resin may be at least one selected from the group consisting of methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, Polyether acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyester acrylate, melamine acrylate, silicone acrylate, and at least one selected from the group consisting of 2,2, And at least one selected from the group consisting of 2,2,4-trimethyl-hexane-diisocyanate and 4-trimethylhexane diisocyanate. The method according to claim 1,
Wherein the siloxane-based resin comprises polydimethylsiloxane. The method according to claim 1,
Wherein at least one of the silica, the silicone resin and the siloxane resin is contained in an amount of more than 0 wt% to 5 wt% with respect to the total amount of the polarizer protective film. The method according to claim 1,
Wherein the thickness of the polarizer protective film is in the range of 15 탆 to 50 탆. A polarizer;
A polarizer protective film disposed on at least one surface of the polarizer; And
And an adhesive layer disposed between the polarizer and the polarizer protective film,
The polarizer protective film may be an acrylic resin; And at least one resin selected from the group consisting of silica, a silicone-based resin and a siloxane-based resin, wherein the glass transition temperature is in the range of 50 캜 to 115 캜. The method according to claim 6,
Wherein the adhesive layer comprises an aqueous adhesive. 8. The method of claim 7,
Wherein the polarizer protective film is directly attached to the polarizer via the adhesive layer. The method according to claim 6,
Wherein the glass transition temperature of the polarizer protective film is in the range of 75 占 폚 to 105 占 폚. The method according to claim 6,
Wherein the glass transition temperature of the polarizer protective film is in the range of 85 占 폚 to 100 占 폚. The method according to claim 6,
Wherein the polarizer protective film includes a functional layer disposed on a side opposite to a side where the adhesive layer is formed,
The functional layer includes a hard-coating layer, an anti-reflection layer, an anti-glare layer, or a diffusion layer. Acrylic resin; And at least one resin selected from the group consisting of silica, a silicone resin and a siloxane resin, wherein the polarizer protective film has a glass transition temperature in the range of 50 캜 to 115 캜;
A step of subjecting one surface of the polarizer protective film to a corona treatment or a plasma treatment; And
And laminating an adhesive layer between one surface of the polarizer protective film and the polarizer. 13. The method of claim 12,
Wherein the adhesive layer comprises an aqueous adhesive. 14. The method of claim 13,
Wherein the polarizer protective film is in direct contact with the adhesive layer. 13. The method of claim 12,
The step of preparing the polarizer protective film
A base film;
An acrylic resin on at least one side of the base film; And at least one resin selected from the group consisting of silica, a silicone-based resin and a siloxane-based resin to form a casting film;
Drying the casting film; And
And peeling the base film to obtain a polarizer protective film.
KR1020150061346A 2015-04-30 2015-04-30 Polarizer protecting film and polarizer plate comprising the same and method for manufacturing the polarizer plate KR20160129345A (en)

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PCT/KR2016/004511 WO2016175601A1 (en) 2015-04-30 2016-04-29 Polarizer protecting film, polarizing plate comprising same, and method for manufacturing polarizing plate

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CN111454473A (en) * 2020-04-21 2020-07-28 武汉华星光电技术有限公司 Composite polarizer protective film, preparation method thereof, polarizer and display device

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JP5399082B2 (en) * 2008-01-17 2014-01-29 日東電工株式会社 Polarizing plate and image display device using polarizing plate
KR101377203B1 (en) * 2010-07-22 2014-03-26 주식회사 엘지화학 Preparation of resin composition for optical film using acryl based resin
KR101265311B1 (en) * 2010-09-20 2013-05-16 주식회사 엘지화학 Aqueous primer composition, polarizing plate comprising the same and method for preparing an optical film having a primer layer
JP5879081B2 (en) * 2011-09-28 2016-03-08 住友化学株式会社 Method for producing acrylic resin film
KR101408712B1 (en) * 2013-05-14 2014-06-17 주식회사 엘지화학 Polarizing plate

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