KR20210026159A - Reddening-resistant layer - Google Patents

Abstract

The present application relates to an optical laminated body or a reddening-resistant layer. In the present application, provided is the optical laminated body or the reddening-resistant layer applied thereto, which may not cause a so-called reddening phenomenon even when driven or maintained under very severe conditions such as an extremely high temperature condition. The reddening-resistant layer includes a pore-containing layer having a reflectance of 2% or more for light having a wavelength in the range of 800 to 1,300 nm.

Description

Reddening-resistant layer

The present application relates to an internal integration layer, an optical laminate including the same, and a display device.

There are increasing cases in which display devices are driven or maintained under harsher conditions. For example, a display device used for a vehicle display such as a navigation system or a vehicle instrument panel is maintained and/or driven at a very high temperature in summer.

Further, depending on the use of the display device, an optical laminate such as a polarizing plate may be used in contact with a glass substrate called a cover glass. Since the cover glass and the like are generally superior in heat conduction properties compared to the optical laminate, the influence of heat in this case is further increased.

Accordingly, it is required to maintain durability even under much harsher conditions compared to the conventional optical laminates such as polarizing plates applied to various display devices.

The present application provides an internalization layer, an optical laminate, and a display device.

Among the physical properties mentioned in the present specification, the physical properties in which the measurement temperature and/or the measurement pressure affect the result are the results measured at room temperature and/or atmospheric pressure, unless otherwise noted.

The term room temperature is a natural temperature that is warmed or not reduced to a temperature, and means, for example, any temperature within the range of 10°C to 30°C, about 23°C or about 25°C. In the present specification, the unit of temperature is °C unless otherwise specified.

The term atmospheric pressure is a natural pressure that is not pressurized or depressurized, and usually means about 1 atmosphere of atmospheric pressure.

In the case of a physical property in which the measured humidity affects the result in the present specification, the corresponding property is a property measured at natural humidity that is not specifically controlled at the room temperature and pressure.

The present application relates to an optical laminate, a display device, or an internal layer. The optical laminate or display device may include the internalization layer. In the present application, the term internalization layer is applied to various optical laminates including an optical functional layer to prevent, alleviate, alleviate, suppress and/or delay redundancy of the optical laminate or the optical functional layer applied to the optical laminate. It can mean any kind of layer that can be. In particular, the internalization layer can effectively prevent, alleviate, reduce, suppress and/or delay redundancy of the optical functional layer even when an optical functional layer that is very weak to heat, such as a polarizing layer to be described later, is used under very severe conditions.

The redization means that the optical laminated body or the optical functional layer turns red. Whether redness has occurred can be checked, for example, through the a* value of the so-called CIE L*a*b* color space. In the CIE L*a*b* color space, as the a* value increases in the positive direction, it means that the object becomes more red. In addition, as the absolute value of the a* value increases in the negative direction, it means that the object becomes more green. Therefore, it can be seen that there is a tendency to increase when the change of the a* value is in a positive direction compared to the initial a* value.

Accordingly, in the present application, the term internalization layer is applied to an optical laminate or is applied together with an optical functional layer to prevent a change or increase in the positive direction of the a* value of the optical laminate and/or the optical functional layer, It can mean any kind of layer capable of alleviating, alleviating, inhibiting and/or delaying.

The redundancy occurs mainly when heat is applied to the optical laminate and/or the optical functional layer, and therefore, the redundancy easily occurs as the optical laminate and/or the optical functional layer is maintained at a high temperature.

에서 약 750 시간 정도 유지하거나, 약 105℃에서 약 250 시간 유지하는 테스트를 의미한다. 상기 a*값의 변화량은, 상기 내열 테스트 후의 a*값(a*_a)에서 상기 내열 테스트 전의 a*값(초기 a*값)(a*_i)을 뺀 수치(a*_a-a*_i)이거나, 혹은 반대로 초기 a*값(상기 a*_i)에서 상기 내열 테스트 후의 a*값(a*_a)을 뺀 수치(a*_i-a*_a)일 수 있다. 내적화층의 취지를 비추어 상기 a*값의 변화량은 상기 내열 테스트 후의 a*값(a*_a)에서 상기 초기 a*값(a*_i)을 뺀 수치(a*_a-a*_i)일 수 있다.In the present application, the term internalization layer may refer to a layer in which the absolute value of the change amount of the a* value of the optical laminate or the optical functional layer after a heat resistance test is 2 or less. The heat resistance test was performed on the optical laminate and/or the optical functional layer at about 95

It means a test that is maintained at about 750 hours or about 250 hours at about 105°C. The amount of change in the a* value is a value obtained by subtracting the a* value (a* _a ) after the heat resistance test and the a* value (initial a* value) (a* _{i ) before the heat resistance test (a* a} -a* _i) ), or vice versa beginning a * value (the a * _i), a * value after the heat resistance test in the (a * _a) value (a * -a * _{a i)} can be obtained by subtracting the. In view of the purpose of the internalization layer, the amount of change in the a* value may be a value obtained by subtracting the initial a* value (a* _{i ) from the a* value (a* a} ) after the heat resistance test (a* _a -a* _i ). have.

In the present application, the heat resistance test may be a heat resistance test performed under severe conditions compared to a conventional heat resistance test. For example, the heat resistance test may be a heat resistance test performed in a state in which the upper and lower surfaces (eg, upper and lower surfaces) of the optical laminate and/or the optical functional layer are brought into contact with a glass substrate. Since a glass substrate is a material that transfers heat better than an optical laminate or an optical functional layer, when a heat resistance test is performed in contact with a glass substrate, the applied heat is affected by the optical laminate and/or the optical functional layer. This becomes even bigger. The type of the glass substrate applied in the heat resistance test is not particularly limited, but in the present specification, it is based on a soda lime glass substrate having a thickness of about 1.1 mm. It is known that the glass substrate has a thermal conductivity of about 0.6W/mK to 1.38W/mK, but the optical laminate or optical functional layer of the present application is in a state in which the glass substrate having high thermal conductivity as described above is in contact. Even if a heat resistance test is performed, redundancy may be prevented, alleviated, alleviated, suppressed and/or delayed. The color coordinates and/or transmittance values related to the heat resistance test referred to in the present specification are based on the applied soda lime glass having a thickness of about 1.1 mm.

The optical laminate of the present application includes at least an optical functional layer; And the internalization layer formed on at least one surface of the optical functional layer. The optical laminate may prevent, alleviate, reduce, suppress and/or delay the redness by including the internalization layer.

For example, in the optical laminate or the optical functional layer included therein, the absolute value of the change amount (Δa*) of the color coordinate a* value of the CIE L*a*b* according to Equation 1 below is 2 or less after the heat resistance test. Can be The color coordinates referred to in this application are the results measured using a JASCO V-7100 Spectrophotometer.

[Equation 1]

△a* = a* _a -a* _i

In Equation 1, Δa* is the amount of change in the color coordinate a*, a* _a is the color coordinate a* value after the heat resistance test, and a* _i is the initial color coordinate a* value before the heat resistance test.

In other examples, the absolute value of the change amount (△a*) is within about 1.9, within about 1.8, within about 1.7, within about 1.6, within about 1.5, within about 1.4, within 1.3, within 1.2, within 1.1, within 1.0, It may be within 0.9, within 0.8, within 0.7, within 0.6, within 0.5, within 0.4, within 0.3, within 0.2, or within 0.1. The absolute value of the change amount (△a*) is not limited because the lower the value, the lower the value may mean that the object has not been redeemed, so the lower limit is not limited, and in one example, the absolute value of the change amount (△a*) is 0 It can be more than that. In an example, it may be a change amount when the a* value changes in a positive direction compared to an initial stage.

The heat resistance test refers to a process of maintaining the optical laminate and/or the optical functional layer at about 95° C. for about 750 hours, or at about 105° C. for about 250 hours, as described above. It can be carried out in a state in which the upper and lower surfaces (upper front and lower front surfaces) of the laminate and/or the optical functional layer are brought into contact with the glass substrate. The amount of change in the a* value can be measured in the manner described in the examples of the present specification.

When redness occurs in the optical laminate and/or the optical functional layer, a phenomenon in which the transmittance is usually lowered occurs. Since the optical laminate of the present application has excellent resistance to redundancy, the change in transmittance is also minimized or not.

For example, in the optical laminate, the absolute value of the change amount (ΔTs) of the transmittance (single transmittance in the case of a polarizing plate) according to Equation 2 below after the heat resistance test described above may be 5 or less. The transmittance is a result of measuring light in the visible region, for example, light in the range of approximately 380 nm to 780 nm using a JASCO V-7100 spectrophotometer.

[Equation 2]

△Ts = T _a -T _i

In Equation 2, △Ts is the amount of change in the transmittance (single transmittance in the case of a polarizing plate), and T _a is the transmittance after the heat resistance test (single transmittance in the case of a polarizing plate) (transmittance after a heat-resistant durability test). , T _i is the initial transmittance (single transmittance in the case of a polarizing plate) before the heat resistance test.

In other examples, the absolute value of the change amount (△Ts) is about 4.9 or less, 4.8 or less, 4.7 or less, 4.6 or less, 4.5 or less, 4.4 or less, 4.3 or less, 4.2 or less, 4.1 or less, 4 or less, 3.9 or less, 3.8 or less, 3.7 or less, 3.6 or less, 3.5 or less, 3.4 or less, 3.3 or less, 3.2 or less, 3.1 or less, 3 or less, 2.9 or less, 2.8 or less, 2.7 or less, 2.6 or less, 2.5 or less, 2.4 or less, 2.3 or less, 2.2 or less, 2.1 or less , 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, 1.5 or less, 1.4 or less, 1.3 or less, 1.2 or less, 1.1 or less, 1.0 or less, 0.9 or less, 0.8 or less, 0.7 or less, 0.6 or less, 0.5 or less, 0.4 or less, 0.3 It may be less than or equal to 0.2 or less than or equal to 0.1. Ideally, no change in the transmittance results in no redness, so the lower limit of the absolute value of the change amount ΔTs is zero. The absolute value of this change amount ΔTs may be approximately greater than 0 in another example.

The heat resistance test for measuring the amount of change in the transmittance may be performed under the same conditions as the heat resistance test for measuring the amount of change in the a* value. The transmittance can be measured in the manner described in the examples herein.

The optical laminate includes an optical functional layer. The term optical functional layer is a layer that exhibits at least one optically intended function. Examples of such optically intended functions include generation, reflection, refraction, absorption, scattering and/or phase retardation of polarized light such as linearly polarized light or circularly polarized light. In the optical field, various layers having the above functions are known, and examples of the optical functional layers applied in the present application may include all kinds of layers in which redundancy is a problem among the known optical functional layers.

In one example, the optical functional layer may be a polarizing layer or a retardation layer. In the present specification, a case where the optical functional layer is a polarizing layer is described, but the type of the optical functional layer is not limited to the polarizing layer. In addition, when the optical functional layer is a polarizing layer, the optical laminate may be a polarizing plate.

In the present specification, the terms polarizing layer and polarizing plate refer to different objects. The term polarizing layer may refer to, for example, a layer exhibiting a polarizing function alone, and a polarizing plate may refer to a laminate including other elements together with the polarizing layer. Other elements included with the polarizing layer in the above may include a protective film or a protective layer of the polarizing layer, the internalization layer, a retardation layer, an adhesive layer, a pressure-sensitive adhesive layer or a low reflection layer, etc., but are limited thereto. It does not become.

The type of polarizing layer applied in the present application is not basically limited. The most common known polarizing layer is a linear absorption type polarizing layer, which is a so-called poly(vinyl alcohol) (hereinafter, referred to as PVA) polarizing layer. In the present specification, the term PVA means polyvinyl alcohol or a derivative thereof, unless otherwise specified. As the PVA polarizing layer, for example, a stretched PVA film in which an anisotropic absorbing material such as iodine or dichroic dye is adsorbed and oriented, or a so-called coated PVA polarizing layer, which is formed thinly by applying PVA to a coating method. Layers and the like are known, but in the present application, all of the above types of polarizing layers may be applied. In addition, in addition to the PVA polarizing layer, a polarizing plate formed of a liquid crystal compound such as LLC (Lyotropic Liquid Crystal), a polymerizable liquid crystal compound (so-called RM (Reactive Mesogen)) and a dichroic dye are oriented in a GH (Guest-Host) method. Layers and the like can also be applied in this application.

The polarizing layer applied in the embodiment of the present application is a PVA polarizing layer, and this polarizing layer is usually manufactured by dyeing and stretching a PVA original film. In the manufacturing process of the PVA polarizing layer, additional processes such as swelling, crosslinking, washing, and/or complementary color processes may optionally be performed, and a process of manufacturing a PVA polarizing layer through such a process is known.

In one example, in order to ensure durability of the optical laminate, particularly high-temperature reliability, as the polarizing layer, a PVA polarizing layer containing a zinc component may be used. In the above, examples of the zinc component include zinc and/or zinc ions. The PVA polarizing layer may also contain a potassium component such as potassium or potassium ions as an additional component. When the polarizing layer containing such a component is used, it is possible to provide an optical laminate that stably maintains durability even under high temperature conditions.

The ratio of the potassium and/or zinc components can be further adjusted. For example, the ratio (K/Zn) of the potassium component (K) and the zinc component (Zn) included in the PVA polarizing layer may be in the range of 0.2 to 8 in one example. The ratio (K/Zn) may be about 0.4 or more, 0.6 or more, 0.8 or more, 1 or more, 1.5 or more, 2 or more, or 2.5 or more, and 7.5 or less, 7 or less, 6.5 or less, 6 or less, 5.5 or less, It may be about 5 or less, about 4.5 or less, or about 4 or less. The ratio may be a molar ratio or a weight ratio.

The content of the potassium component included in the PVA polarizing layer may be about 0.1 to 2% by weight. The proportion of the potassium component is in another example about 0.15% by weight or more, about 0.2% by weight or more, about 0.25% by weight or more, about 0.3% by weight or more, about 0.35% by weight or more, 0.4% by weight or more, or about 0.45% by weight or more. , About 0.5% by weight or more, about 0.55% by weight or more, about 0.6% by weight or more, about 0.65% by weight or more, about 0.7% by weight or more, about 0.75% by weight or more, or about 0.8% by weight or more, and about 1.95% by weight or less , About 1.9% or less, about 1.85% or less, about 1.8% or less, about 1.75% or less, about 1.7% or less, about 1.65% or less, about 1.6% or less, about 1.55% or less, about 1.5% or less, about 1.45% or less, about 1.4% or less, about 1.35% or less, about 1.3% or less, about 1.25% or less, about 1.2% or less, about 1.15% or less, about 1.1% by weight % Or less, about 1.05% by weight or less, about 1% by weight or less, about 0.95% by weight or less, about 0.9% by weight or less, or about 0.85% by weight or less.

In one example, the ratio of the potassium component and the zinc component may be included to satisfy Equation 3 below.

[Equation 3]

0.70 to 1 = 1/(1+0.025d/R)

In Equation 3, d is the thickness of the PVA polarizing layer (㎛), and R is the ratio of the weight ratio (K, unit: weight%) of the potassium component contained in the polarizing layer and the weight ratio of the zinc component (Zn, unit: weight%) (K/Zn).

By including potassium and zinc components in the polarizing layer in the above form, it may be possible to provide a polarizing layer having excellent reliability at a high temperature.

In Equation 3, the value of 1/(1+0.025d/R) may be about 0.75 or more, 0.8 or more, or 0.85 or more in another example, and the value of 1/(1+0.025d/R) is about 0.97 or less, It may be about 0.95 or less or about 0.93 or less.

In the above description, the content of the potassium and/or zinc component can be measured in the manner described in Examples of the present specification.

The polarizing layer applied in the present application may be a polarizing layer manufactured according to a known method of manufacturing a polarizing layer. In addition, in the case of applying the polarizing layer including the potassium and/or zinc component as the polarizing layer in the present application, the process conditions so that zinc and/or potassium can be included in the polarizing layer in the manufacturing process of the known polarizing layer. It can be manufactured by controlling.

As described above, the PVA polarizing layer is usually prepared by dyeing and stretching a PVA film (original film), and optionally swelling, crosslinking, washing and/or complementary color processes may be additionally performed in the manufacturing process of the PVA polarizing layer. have. The stretching process may be performed as a separate process, or may be performed simultaneously with other processes such as dyeing, swelling and/or crosslinking. In this manufacturing process, treatment liquids such as dyeing liquid, crosslinking liquid, swelling liquid, washing liquid and/or complementary liquid are applied. By adjusting the components of the treatment liquid, it is determined whether or not the potassium and/or zinc components are included, or You can adjust the ratio, etc.

In the dyeing process, the anisotropic absorbing material can be adsorbed and/or orientated on the PVA film. This dyeing process, if necessary, can be performed in conjunction with the stretching process. Dyeing may be performed by immersing the film in a solution containing an anisotropic absorbent material, for example, an iodine solution. As the iodine solution, for example, _{an aqueous solution containing iodine ions by iodine (I 2} ) and an iodide compound serving as a dissolution aid may be used. As the iodide compound, for example, potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide or titanium iodide may be used. The concentration of iodine and/or iodide ions in the iodine solution may be adjusted in consideration of the optical properties of the desired polarizing layer, and such a control method is known. Usually, the content of iodine in the dyeing solution (iodine solution) is about 0.01 to 5% by weight, and the concentration of the iodide compound may be about 0.01 to 10% by weight. In another example, the iodine content may be 0.05% by weight or more, 0.1% by weight or more, or 0.15% by weight or more, and 4.5% by weight or less, 4% by weight or less, 3.5% by weight or less, 3% by weight or less, 2.5% by weight or less, 2 It may be less than or equal to 1.5% by weight, less than or equal to 1% by weight, or less than or equal to 0.5% by weight. In another example, the concentration of the iodide compound may be 0.05% by weight or more, 0.1% by weight or more, 0.5% by weight or more, 1% by weight or more, 1.5% by weight or more, or 2% by weight or more, and 9% by weight or less, 8% by weight or less , It may be about 7% by weight or less, 6% by weight or less, 5% by weight or less, 4% by weight or less, or about 3% by weight or less. In the dyeing process, the temperature of the iodine solution is typically about 20°C to 50°C, 25°C to 40°C, and the immersion time is usually about 10 seconds to 300 seconds or 20 seconds to 240 seconds, but is not limited thereto.

The stretching process is generally performed by uniaxial stretching, but other methods such as biaxial stretching may be applied if necessary. Such stretching may be performed together with the dyeing and/or a crosslinking process described later. The stretching method is not particularly limited, and for example, a wet method may be applied. In this wet method, for example, it is common to perform stretching after dyeing. Stretching may be performed together with crosslinking, and may be performed multiple times or in multiple stages. The above-described iodide compound can be contained in the treatment liquid applied to the wet stretching method. The concentration of the iodide compound in the treatment liquid may be about 0.01 to 10% by weight. In another example, the concentration of the iodide compound may be 0.05% by weight or more, 0.1% by weight or more, 0.5% by weight or more, 1% by weight or more, 1.5% by weight or more, or 2% by weight or more, and 9% by weight or less, 8% by weight or less , It may be about 7% by weight or less, 6% by weight or less, 5% by weight or less, 4% by weight or less, or about 3.5% by weight or less. In stretching, the treatment temperature is usually 25°C or higher, 30°C to 85°C, or 40°C to 70°C, and the treatment time is usually 10 seconds to 800 seconds or 30 seconds to 500 seconds, but is not limited thereto. . In the stretching process, the total draw ratio can be adjusted in consideration of orientation characteristics, etc., and the total draw ratio may be about 3 to 10 times, 4 to 8 times or 5 to 7 times based on the original length of the PVA film. It is not limited thereto. In the above, the total draw ratio may mean a cumulative draw ratio including stretching in each step when stretching is also involved in other processes such as swelling, dyeing and/or crosslinking processes other than the stretching process. This total draw ratio may be adjusted to an appropriate range in consideration of orientation, workability of the polarizing layer, or possibility of stretching and cutting.

In the manufacturing process of the polarizing layer, a swelling process may be performed in addition to the dyeing and stretching, which is usually performed before the dyeing process. By swelling, it is possible to clean the surface of the PVA film with an anti-blocking agent or contamination, and there is also an effect of reducing unevenness such as dyeing deviation.

In the swelling process, water, distilled water, pure water, or the like may be used. The main component of the treatment liquid is water, and if necessary, an additive such as an iodide compound such as potassium iodide or a surfactant, or a small amount of alcohol may be contained. The treatment temperature in the swelling process is usually about 20°C to 45°C or 20°C to 40°C, but is not limited thereto. Since swelling deviations can cause dyeing deviations, the process parameters can be adjusted so that the occurrence of such swelling deviations is suppressed as much as possible. Even in the swelling process, appropriate stretching can be performed optionally. The draw ratio may be about 6.5 times or less, 1.2 to 6.5 times, 2 to 4 times, or 2 to 3 times based on the original length of the PVA film. The stretching in the swelling process can be controlled so that the stretching in the stretching process performed after the swelling process can be controlled to be small, and the stretching breakage of the film does not occur.

The crosslinking process can be performed using, for example, a crosslinking agent such as a boron compound. The order of the crosslinking process is not particularly limited, and for example, it may be performed together with the dyeing and/or stretching process, or may be performed separately. The crosslinking process may be performed several times. As the boron compound, boric acid or borax may be used. The boron compound may be generally used in the form of an aqueous solution or a mixed solution of water and an organic solvent, and an aqueous boric acid solution is usually used. The boric acid concentration in the boric acid aqueous solution may be selected in an appropriate range in consideration of crosslinking degree and thus heat resistance. An iodide compound such as potassium iodide can also be contained in an aqueous boric acid solution or the like. The concentration of the iodide compound in the aqueous boric acid solution may be about 0.01 to 10% by weight. In another example, the concentration of the iodide compound may be 0.05% by weight or more, 0.1% by weight or more, 0.5% by weight or more, 1% by weight or more, 1.5% by weight or more, or 2% by weight or more, and 9% by weight or less, 8% by weight or less , It may be about 7% by weight or less, 6% by weight or less, 5% by weight or less, 4% by weight or less, or about 3.5% by weight or less. The crosslinking process can be performed by immersing the PVA film in an aqueous boric acid solution or the like. In this process, the treatment temperature is typically 25°C or higher, 30°C to 85°C, or 30°C to 60°C, and the treatment time is typically 5 seconds to 800 seconds or 8 seconds to 500 seconds.

In the manufacturing process of the polarizing layer, metal ion treatment may be performed, and this may be generally referred to as a complementary color process. Such treatment is performed, for example, by immersing a PVA film in an aqueous solution containing a metal salt. Through this, it is possible to contain metal components such as metal ions in the polarizing layer. In this process, the type or ratio of the metal component can be adjusted. Examples of metal ions that can be applied include metal ions of transition metals such as cobalt, nickel, zinc, chromium, aluminum, copper, manganese, or iron. have.

In order to manufacture a polarizing layer containing zinc, a zinc component may be included in a treatment liquid (aqueous solution containing a metal salt) applied in the complementary color process. However, if necessary, the zinc component may be applied during another process, and in this case, the zinc component may be included in another treatment liquid or a separate treatment liquid such as a dyeing solution or a crosslinking solution. The zinc component may be introduced by dissolving at least one zinc salt selected from zinc chloride, zinc iodide, zinc sulfate, zinc nitrate, and zinc acetate in the aqueous solution. In this case, in order to achieve the desired zinc content, the concentration of the zinc salt may be adjusted to about 0.01 to 10% by weight. In another example, the concentration of the zinc salt is 0.05% by weight or more, 0.1% by weight or more, 0.5% by weight or more, 1% by weight or more, 1.5% by weight or more, or 2% by weight or more, 9% by weight or less, 8% by weight or less, 7 It may be about weight% or less, 6 weight% or less, 5 weight% or less, 4 weight% or less, or 3 weight% or less. If necessary, a potassium component may also be included in the treatment liquid. Potassium salts, such as potassium iodide, can be illustrated as a potassium component. The concentration of the potassium salt may be about 0.01 to 10% by weight. The concentration is also 0.05% by weight or more, 0.1% by weight or more, 0.5% by weight or more, 1% by weight or more, 1.5% by weight or more, 2% by weight or more, 2.5% by weight or more, 3% by weight or more, 3.5% by weight or more , 4 wt% or more, 4.5 wt% or more, 5 wt% or more, 9 wt% or less, 8 wt% or less, 7 wt% or less, or 6 wt% or less. In the complementary color process, by applying a zinc salt or a potassium salt as described above, a desired level of zinc and potassium components can be included in the polarizing layer.

In the manufacturing process of the polarizing layer, a washing process may be performed after dyeing, crosslinking, and stretching. This cleaning process may be usually performed before the complementary color process, and may be performed using water. If necessary, other components such as iodine, iodide, and other metal salts, or components such as liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol or propanol, may be blended in an appropriate amount in the water applied to the washing process.

After passing through such a process, a drying process may be performed to prepare a polarizing layer. In the drying process, for example, it may be performed at an appropriate temperature for an appropriate time in consideration of the moisture content required for the polarizing layer, and such conditions are not particularly limited.

In the above process, as described above, zinc and/or potassium components may be included in the polarizing layer.

However, the method for manufacturing the polarizing layer including the zinc and/or potassium component is not limited thereto. For example, a zinc component may be included in the polarizing layer in a process other than a complementary color process by including a zinc salt in a treatment liquid applied to swelling, dyeing, crosslinking, stretching and/or washing treatment. In addition, since a potassium component such as potassium iodide may be included in the treatment liquid applied to the swelling, dyeing, crosslinking, stretching and/or washing treatment, etc., the ratio of the potassium component may be adjusted in this process. A person skilled in the art may appropriately employ a general method of manufacturing a polarizing layer and include a desired level of zinc and/or potassium components in the polarizing layer depending on the purpose.

The thickness of the polarizing layer that can be applied in the present application is not limited. That is, in the present application, since a general known polarizing layer may be applied as the polarizing layer, the conventional thickness is also applied. In general, the thickness of the polarizing layer may be in the range of 5 μm to 80 μm, but is not limited thereto.

The optical laminate of the present application includes the internal integration layer. The internalization layer is a layer capable of preventing, alleviating, alleviating, suppressing and/or delaying redundancy of the optical laminate and/or the optical functional layer as mentioned above. Redness of the optical laminate and/or the optical functional layer is expected to occur due to heat.As the use of the display device expands, the optical laminate and/or the optical functional layer are more frequently exposed to higher temperatures. It is thought that red fire, which was not a problem, is largely occurring.

Accordingly, as the internalization layer, a layer that blocks heat applied to the optical laminate and/or the optical functional layer, reduces the degree of applied heat, or slows the transfer rate of heat may be applied.

In one example, the internalization layer may be a layer having an appropriate thermal diffusivity. For example, for the internalization layer, a laminate is prepared by forming the internal internalization layer on a polymer film, and the thermal diffusivity measured at 95°C for the stacked body of the internalization layer and the polymer film is the same as that of the polymer film alone. It may have a thermal diffusivity of less than 90% compared to the thermal diffusivity.

In this case, the internalization layer may satisfy Equation 4 below. As will be described later, in the present application, the term internalization layer may mean a pore-containing layer itself, or a laminate including at least the pore-containing layer. Accordingly, the internalization layer referred to in Equation 4 below may be a void-containing layer described later, or may be an internalization layer of a laminated structure including the same.

[Equation 4]

H _L ≤ 0.9×H _P

In Equation 4, H _L is a thermal diffusivity of a polymer film and a laminate comprising the inner layer or void-containing layer formed on one surface of the polymer film, and H _P is the thermal diffusivity of the polymer film.

In the present specification, the type of the polymer film for measuring the thermal diffusivity is not particularly limited, and for example, a triacetyl cellulose (TAC) film having a thickness of 60 μm may be applied. In another example, the thermal diffusivity (95°C) of the laminate is 89% or less, 88% or less, 87% or less, 86% or less, 85% or less of the thermal diffusivity (95°C) of the TAC film. Degree, about 84% or less, 83% or less, 82% or less, 81% or less, 80% or less, 79% or less, 78% or less, 77% or less, 76% or less, 75% or less Degree, about 74% or less, 73% or less, 72% or less, 71% or less, 70% or less, 69% or less, 68% or less, 67% or less, 66% or less, or 65% or less About 10% or more, 11% or more, 12% or more, 13% or more, 14% or more, 15% or more, 16% or more, 17% or more, 18% or more, 19% More than 20%, more than 21%, more than 22%, more than 23%, more than 24%, more than 25%, more than 26%, more than 27%, more than 28%, 29% More than 30%, more than 31%, more than 32%, more than 33%, more than 34%, more than 35%, more than 36%, more than 37%, more than 38%, 39% Abnormality, 40% or more, 41% or more, 42% or more, 43% or more, 44% or more, 45% or more, 46% or more, 47% or more, 48% or more, 49% More than 50%, more than 51%, more than 52%, more than 53%, more than 54%, more than 55%, more than 56%, more than 57%, more than 58%, 59% It may be about an abnormality or about 60% or more.

Therefore, _{the coefficients multiplied by H P} in Equation 4 are 0.89, 0.88, 0.87, 0.86, 0.85, 0.84, 0.83, 0.82, 0.81, 0.80, 0.79, 0.78, 0.77, 0.76, 0.75, 0.74, 0.73, 0.72, It may be 0.71, 0.70, 0.69, 0.68, 0.67, 0.66 or 0.65. In addition, in Equation 4, H _L is 0.10 × H _P or more, 0.11 × H _P or more, 0.12 × H _P or more, 0.13 × H _P or more, 0.14 × H _P or more, 0.15 × H _P or more, 0.16 × H _P or more , 0.17 × H _P or more, 0.18 × H _P or more, 0.19 × H _P or more, 0.20 × H _P or more, 0.21 × H _P or more, 0.22 × H _P or more, 0.23 × H _P or more, 0.24 × H _P or more, 0.25 ×H _P or more, 0.26 × H _P or more, 0.27 × H _P or more, 0.28 × H _P or more, 0.29 × H _P or more, 0.30 × H _P or more, 0.31 × H _P or more, 0.32 × H _P or more, 0.33 × H _P or more, 0.34 × H _P or more, 0.35 × H _P or more, 0.36 × H _P or more, 0.37 × H _P or more, 0.38 × H _P or more, 0.39 × H _P or more, 0.40 × H _P or more, 0.41 × H _P or more , 0.42 x H _P or more, 0.43 x H _P or more, 0.44 x H _P or more, 0.45 x H _P or more, 0.46 x H _P or more, 0.47 x H _P or more, 0.48 x H _P or more, 0.49 x H _P or more, 0.50 ×H _P or more, 0.51 × H _P or more, 0.52 × H _P or more, 0.53 × H _P or more, 0.54 × H _P or more, 0.55 × H _P or more, 0.56 × H _P or more, 0.57 × H _P or more, 0.58 × H _It may be _P or more, 0.59×H _P or more, or 60×H P or more.

The surface properties of the internalization layer or the void-containing layer can be controlled. The internalization layer or the void-containing layer is directly attached to the optical functional layer, or an optical layer adjacent to the optical functional layer in order to be positioned adjacent to the optical functional layer to be prevented, alleviated, alleviated, suppressed and/or delayed. It can be attached to other layers of the laminate. In this case, by controlling the surface characteristics of the internalization layer or the void-containing layer, the internalization layer or the void-containing layer can be attached while having excellent adhesion with the optical functional layer or other layer, and thus, the redundancy is more effectively prevented. , Alleviate, alleviate, inhibit and/or delay. For example, the internalization layer or the pore-containing layer may include at least one surface having a surface area ratio of 0.02 or more measured by an atomic force microscope (AFM). For example, at least one of the main surfaces of the internalization layer or the pore-containing layer, or both surfaces may have the surface area ratio. In one example, the surface of the internalization layer or the pore-containing layer having at least the surface area ratio may be a surface facing the optical functional layer or other layer to which the internalization layer or the pore-containing layer is attached. In another example, the ratio of the surface area of the internalization layer or the void-containing layer is 0.022 or more, 0.024 or more, 0.026 or more, 0.028 or more, 0.03 or more, 0.032 or more, or 0.034 or more, 0.5 or less, 0.45 or less, 0.4 or less, 0.35 or less, 0.3 or less, or It may be about 0.25 or less. The surface area ratio can be measured by the method described in Examples.

The internalization layer or the void-containing layer can exhibit a desired level of reflectance with respect to infrared rays. Since heat is also transmitted in the form of infrared rays, a target redness prevention characteristic can be secured even when an appropriate reflectance is exhibited. In the present specification, the term infrared may mean an electromagnetic wave having a wavelength within a range of approximately 800 nm to 1,300 nm, a wavelength within a range of a partial region within the range, or a wavelength of the entire region. Accordingly, the infrared reflectance may be a reflectance for any one wavelength within the range of 800 nm to 1,300 nm, or may be an average reflectance for a range of a partial region or an entire region within the range. The reflectance can be measured according to the method described in the embodiments of the present specification. The internalization layer or the pore-containing layer may have an infrared reflectance of 2% or more. In another example, the reflectance may be about 2.5% or more, about 3% or more, 3.5% or more, or 4% or more. Since the above reflectance means that the higher the value, the more the internalization layer or the void-containing layer can appropriately block and/or delay the heat applied to the optical laminate and/or the optical functional layer, so the upper limit is not particularly limited. . For example, the infrared reflectance may be about 10% or less, 9% or less, 8% or less, 7% or less, 6% or less, or 5% or less.

As the internalization layer or the void-containing layer, as long as it has an appropriate transmittance applicable to the optical laminate and has the above characteristics (thermal diffusivity, surface area ratio, and/or reflectance), various layers may be applied without particular limitation. If it has the above characteristics, it is possible to prevent, alleviate, alleviate, suppress and/or delay redness, so that if the transmittance is properly secured, all theoretically applicable in the present application. In the above, the transmittance required in the optical laminate may be approximately 70% or more, 75% or more, 80% or more, 85% or more, or 90% or more. The transmittance is more suitable as the value increases, and the upper limit thereof is not particularly limited. For example, the transmittance may be about 100% or less, 95% or less, or 90% or less. In the above, the transmittance may be light in the visible region, for example, a wavelength within a range of approximately 380 nm to 780 nm, a wavelength within a certain region within the range, or transmittance over the entire region, or an average transmittance.

As the internalization layer, for example, a layer containing a void-containing layer can be applied. In the present application, the internalization layer may be a layer having only the pore-containing layer alone, or a laminate including a layer different from the pore-containing layer as long as the purpose of preventing redundancy is satisfied. In one example, the internalization layer may exhibit the above-mentioned properties (thermal diffusivity, surface area ratio, and/or infrared reflectance) by including the pore-containing layer. Accordingly, the above-mentioned thermal diffusivity, surface area ratio and/or infrared reflectance may be for the pore-containing layer, or at least for a laminate comprising the pore-containing layer. In the above, the types of other elements included in the internal integration layer together with the void-containing layer are not particularly limited, and may be, for example, elements constituting an optical laminate such as the polarizing layer or a protective film thereof, a retardation film, or the like.

The void-containing layer is a layer including at least one or more voids therein, and through such voids, the internalization layer may perform a function of preventing, alleviating, alleviating, suppressing, and/or delaying heat transfer. In order to ensure the above-described physical properties, for example, thermal diffusivity, surface area ratio, and/or reflectance, it is important that the internalization layer includes the pore-containing layer. At this time, the shape of the pores included in the pore-containing layer is not particularly limited, and for example, a substantially spherical or ellipsoid shape, or all other various types of pores may be applied.

The size of the pores may be in the range of approximately 0.5 nm to 100 nm. The size of the pores refers to the particle diameter when the pores are spherical, and when the pores are not spherical, the pore size is the spherical particle diameter assuming that the pores are spherical with the same volume. In another example, the size of the pores is about 1 nm or more, about 2 nm or more, about 3 nm or more, about 4 nm or more, about 5 nm or more, about 6 nm or more, about 7 nm or more, about 8 nm or more, about 9 nm or more, about 10 nm or more, about 11 nm Or more, about 12 nm or more, about 13 nm or more, about 14 nm or more, about 15 nm or more, about 16 nm or more, about 17 nm or more, about 18 nm or more, about 19 nm or more, about 20 nm or more, about 21 nm or more, about 22 nm or more, about 23 nm or more, About 24 nm or more, about 25 nm or more, about 26 nm or more, about 27 nm or more, about 28 nm or more, about 29 nm or more, about 31 nm or more, about 32 nm or more, about 33 nm or more, about 34 nm or more, about 35 nm or more, about 36 nm or more, about 37 nm or more, about 38 nm or more, about 99 nm or less, about 98 nm or less, about 97 nm or less, about 96 nm or less, about 95 nm or less, about 94 nm or less, about 93 nm or less, about 92 nm or less, about 91 nm or less, about 90 nm or less, about 89 nm or less, about 88 nm or less, about 87 nm or less, about 86 nm or less, about 85 nm or less, about 84 nm or less, about 83 nm or less, about 82 nm or less, about 81 nm or less, about 79 nm or less, about 78 nm or less, about 77 nm or less, about 76 nm or less , About 75 nm or less, about 74 nm or less, about 73 nm or less, about 72 nm or less, about 71 nm or less, about 69 nm or less, about 68 nm or less, about 67 nm or less, about 66 nm or less, about 65 nm or less, about 64 nm or less, about 63 nm or less, about 62 nm or less, about 61 nm or less, about 59 nm or less, about 58 nm or less, about 57 nm or less, about 56 nm or less, about 55 nm or less, about 54 nm or less, about 53 nm or less, about 52 nm or less, about 51 nm or less, about 50 nm or less, about 49 nm or less , About 48 nm or less, about 47 nm or less, about 46 nm or less, or about 45 nm or less It may be degrees.

In order to maximize the effect of the internalization layer and secure the above-described physical properties (thermal diffusivity, surface area ratio and/or reflectance, etc.), the position or distribution of the pores in the pore-containing layer may be controlled.

For example, the internalization layer or the pore-containing layer is a scattering vector of ^{0.06 nm -1} to 0.209 nm ^-1 in the log value graph of the scattering intensity of SAXS (Small Angle X-ray Scattering) analysis. ) May represent at least one peak. The above characteristic is a characteristic that reflects the average distance between the voids. For example, a decrease in the scattering vector representing the peak means a tendency that the average distance between the pores in the internal integration layer or the pore-containing layer increases, and the conversely increase indicates a tendency that the average distance between the pores becomes closer.

When the scattering vector is 0.06 nm ^-1 or more, it is advantageous in the characteristic that the voids are properly concentrated in the internal integration layer or the void-containing layer to block or reduce applied heat. In addition, if the vector is 0.209 nm ^-1 or less, voids are disposed at appropriate intervals in the internalization layer or the pore-containing layer, so that the roughness of the surface of the internalization layer or the pore-containing layer is maintained at an appropriate level. The application of the formation layer or the void-containing layer to the optical laminate can be made easier. In other examples, the scattering vector in which the peak is confirmed is about 0.065 nm ^-1 or more, 0.07 nm ^-1 or more, 0.075 nm ^-1 or more, 0.08 nm ^-1 or more, 0.085 nm ^-1 or more, 0.09 nm ^-1 or more, 0.095 nm ^-1 or more or 0.1 nm ^-1 or more, and may be 0.205 nm ^-1 or less, 0.2 nm ^-1 or less, 0.19 nm ^-1 or less, 0.185 nm ^-1 or less, 0.18 nm ^-1 or less, or 0.16 nm ^-1 or less .

In the above, the peak is an extreme value or an inflection point in which the log value of the scattering intensity appears convex upward in the graph of the log value of the scattering intensity identified by the analysis. In addition, the scattering vector is a value defined by Equation 5 below, and at least one or more peaks may be identified within the range of the scattering vector.

[Equation 5]

q = 4πsin(θ/λ)

In Equation 5, q is the scattering vector, θ is a value of 1/2 times the scattering angle, and λ is the wavelength (unit: nm) of the irradiated X-rays.

The method of performing the small-angle X-ray scattering evaluation described above is in accordance with the description of the embodiments of the present specification.

The internalization layer or the void-containing layer may have an A value of 1.5 or less, a B value of 0 to 0.01, and a C value of 0 to 0.001 satisfying Equation 6 below.

[Equation 6]

In Equation 6, n(λ) is the refractive index of the internally integrated layer or the pore-containing layer at the wavelength λ, and λ is any wavelength within the range of 300 to 1800 nm.

In Equation 6, the ellipticity of the polarization measured by ellipsometry with respect to the internalization layer or the pore-containing layer is fitted according to the so-called Cauchy model. When the internalization layer or the pore-containing layer has A, B, and C values in the above-described ranges that satisfy Equation 6, the internalization layer or the pore-containing layer may have pore characteristics capable of expressing the internalization function. Equation 6 reflects the refractive index characteristics exhibited by the internalization layer or the void-containing layer. The total refractive index of the internalization layer or the void-containing layer is determined by the refractive index of the voids constituting the internalization layer or the void-containing layer and the refractive index of other components other than the voids such as a binder. Accordingly, the values of A, B, and C in Equation 6 of the internalization layer or the pore-containing layer may reflect the amount of voids in the internalization layer. In one example, when the values of A, B, and/or C are within the above range, the pores in the internalization layer or the pore-containing layer exist at a level capable of appropriately blocking or delaying the transfer of heat, and the surface of the internalization layer or the pore-containing layer is The roughness and the like are maintained at an appropriate level, so that the application of the internalization layer or the void-containing layer to the optical laminate can be made easier.

In another example, the A value may be about 1.1 or more, 1.15 or more, 1.2 or more, 1.25 or more, or 1.3 or more. In the above, the B value may be 0.0001 or more, 0.0002 or more, 0.0003 or more, 0.0004 or more, 0.0005 or more, 0.0006 or more, or 0.0007 or more, or 0.009 or less, 0.008 or less, 0.007 or less, 0.006 or less, 0.005 or less, or 0.004 or less. . In other examples, the C value is 0.000001 or more, 0.00002 or more, 0.000003 or more, 0.000004 or more, 0.000005 or more, 0.000006 or more, 0.000007 or more, 0.000008 or more, 0.000009 or more, 0.00001 or more, 0.00002 or more, 0.00003 or more, 0.00004 or more, 0.00005 or more, It may be 0.00006 or more than 0.00007, or about 0.0009 or less, 0.0008 or less, 0.0007 or less, 0.0006 or less, 0.0005 or less, or 0.0004 or less.

In Equation 6, λ is any one wavelength within the range of 300 to 1800 nm, and in one example, approximately 400 nm or more or 500 nm or more, 1700 nm or less, 1600 nm or less, 1500 nm or less, 1400 nm or less, 1300 nm or less, 1200 nm Hereinafter, 1100 nm or less, 1000 nm or less, 900 nm or less, 800 nm or less, 700 nm or less, or 600 nm or less, or may be in a wavelength range of about 550 nm. The internalization layer or the void-containing layer that satisfies Equation 6 may have a refractive index (based on a 550 nm wavelength) of about 1.5 or less, and in another example, the refractive index may be about 1.1 or more or 1.15 or more.

The volume fraction of voids in the internalization layer or the void-containing layer may be 0.1 or more. The volume fraction is the ratio of the volume of the space occupied by the voids when the total volume of the internalization layer or the void-containing layer is converted to 1. In this range, the internalization layer or the pore-containing layer may appropriately block or reduce the transfer of heat. The volume fraction is measured by confirming the density, mass, and volume of the internalization layer or the pore-containing layer through a buoyancy method, etc., or of the hollow particles applied when the internalization layer or the pore-containing layer is formed using hollow particles, as described below. It can be checked through the amount and the amount of binder.

The internalization layer or the void-containing layer can be formed in a variety of ways. A typical method of forming a layer containing voids is a method of applying hollow particles. Accordingly, in one example, the internalization layer may include at least a binder and hollow particles.

In the above, the above properties (thermal diffusivity, volume fraction, satisfaction of Equation 6, incineration) are controlled by controlling the refractive index of the binder and the shell portion of the hollow particles, the size distribution of the hollow particles and the pores therein, and the amount of the hollow particles. X-ray scattering characteristics, etc.) can be satisfied.

Various types of binders may be applied without any particular limitation. For example, various curable resin compositions that can be applied for optics may be applied as the binder. The optical resin that can be applied includes, for example, acrylic, epoxy, and/or silicone, and the binder may be formed by applying the resin or a precursor capable of forming the resin. Such a resin or precursor may be curable, and may be, for example, a material cured by irradiation of light such as ultraviolet rays or electron beams, a material cured by heat, or a material cured by other actions such as moisture.

As the binder, one having a refractive index (based on a 550 nm wavelength) in the range of approximately 1.1 to 1.6 may be applied. In such a refractive index range, it is possible to easily form an internally integrated layer that satisfies Equation 6 above by combining with hollow particles. In another example, the refractive index may be about 1.15 or more, about 1.2 or more, about 1.25 or more, about 1.3 or more, about 1.35 or more, or about 1.4 or more, or about 1.55 or less or about 1.5 or less.

A typical binder that satisfies this refractive index is an acrylic binder. The binder of the internalization layer may contain a polymerization unit of a polymerizable acrylic compound.

In one example, the acrylic compound is an alkyl (meth)acrylate or alkoxy (meth) having an alkyl group or alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms Acrylate; 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate or 8-hydroxyoctyl ( Monofunctional acrylate compounds such as hydroxyalkyl (meth)acrylate such as meth)acrylate; 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl glycol adipate ( neopentylglycol adipate) di(meth)acrylate, hydroxyl puivalic acid neopentylglycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di (Meth)acrylate, ethylene oxide-modified di(meth)acrylate, di(meth)acryloxy ethyl isocyanurate, allylated cyclohexyl di(meth)acrylate, tricyclodecanedimethanol (meth) )Acrylate, dimethylol dicyclopentane di(meth)acrylate, ethylene oxide modified hexahydrophthalic acid di(meth)acrylate, tricyclodecane dimethanol(meth)acrylate, neopentyl glycol modified trimethylpropane di(meth) ) Acrylate, adamantane di(meth)acrylate or 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, and the like; Trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, propionic acid-modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide Trifunctional acrylates such as modified trimethylolpropane tri(meth)acrylate, trifunctional urethane (meth)acrylate, or tris(meth)acryloxyethyl isocyanurate; Tetrafunctional acrylates such as diglycerin tetra(meth)acrylate or pentaerythritol tetra(meth)acrylate; 5-functional acrylates, such as propionic acid-modified dipentaerythritol penta(meth)acrylate; And dipentaerythritol hexa(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate or urethane (meth)acrylate (ex. of an isocyanate monomer and trimethylolpropane tri(meth)acrylate) Hexafunctional acrylates such as reactants) can be used.

The polyfunctional acrylate is a compound referred to as a so-called photocurable oligomer in the industry, and urethane acrylate, epoxy acrylate, polyester acrylate, or polyether acrylate may also be used. Among the above compounds, one or more suitable types may be selected and used.

The type of the binder forming the internalization layer or the void-containing layer is not limited to the above, and other various optical materials may be applied.

As the hollow particles, for example, particles having a specific particle size distribution may be used in order to satisfy the above-mentioned respective physical properties. For example, as the hollow particles, particles having a D10 particle diameter, a D50 particle diameter, and a D90 particle diameter in the range of 20 nm to 50 nm, 55 nm to 100 nm, and 110 nm to 180 nm, respectively, in the weight accumulation curve of the particle size distribution may be applied. . In the above, the particle diameters of D10, D50 and D90 make the total weight of the hollow particles 100 weight, respectively, and 10% by weight, 50% by weight, and 90% by weight of the maximum value (100% by weight) in the cumulative distribution graph indicating the weight by particle size. It is the value of the particle diameter corresponding to. Through the application of particles having a particle size distribution as described above, the desired internal integration layer can be effectively formed.

The D10 particle diameter is about 21 nm or more, 22 nm or more, 23 nm or more, 24 nm or more, 25 nm or more, 26 nm or more, 27 nm or more, 28 nm or more, 29 nm or more, 30 nm or more, 31 nm or more or 32 nm or more, or 49 nm or less, 48 nm or less, 47 nm or less, 46 nm or less, 45 nm or less, 44 nm or less, 43 nm or less, 42 nm or less, 41 nm or less, 40 nm or less, 39 nm or less, 38 nm or less, 37 nm or less, 36 nm or less, 35 nm or less, 34 nm or less, or 33 nm or less May be.

In another example, the D50 particle diameter is about 56 nm or more, 57 nm or more, 58 nm or more, 59 nm or more, 60 nm or more, 61 nm or more, or 62 nm or more, 99 nm or less, 98 nm or less, 97 nm or less, 96 nm or less, 95 nm or less, 94 nm or less, 93 nm Or less, 92nm or less, 91nm or less, 90nm or less, 89nm or less, 88nm or less, 87nm or less, 86nm or less, 85nm or less, 84nm or less, 83nm or less, 82nm or less, 81nm or less, 79nm or less, 78nm or less, 77nm or less, 76nm or less, It may be 75 nm or less, 74 nm or less, 73 nm or less, 72 nm or less, 71 nm or less, or about 70 nm or less.

The D90 particle diameter is about 111 nm or more, 112 nm or more, 113 nm or more, 114 nm or more, 115 nm or more, 116 nm or more, 117 nm or more, 118 nm or more, 119 nm or more, 120 nm or more, 121 nm or more, 122 nm or more, or 123 nm or more, or 179 nm or less. , 178nm or less, 177nm or less, 176nm or less, 175nm or less, 174nm or less, 173nm or less, 172nm or less, 171nm or less, 170nm or less, 169nm or less, 168nm or less, 167nm or less, 166nm or less, 165nm or less, 164nm or less, 163nm or less, 162nm Or less, 161 nm or less, 160 nm or less, 159 nm or less, 158 nm or less, 157 nm or less, 156 nm or less, 155 nm or less, 154 nm or less, 153 nm or less, 152 nm or less, 151 nm or less, 150 nm or less, 149 nm or less, 148 nm or less, 147 nm or less, 146 nm or less, 145nm or less, 144nm or less, 143nm or less, 142nm or less, 141nm or less, 140nm or less, 139nm or less, 138nm or less, 137nm or less, 136nm or less, 135nm or less, 134nm or less, 133nm or less, 132nm or less, 131nm or less, 130nm or less, 129nm or less , 128 nm or less, 127 nm or less, or may be about 126 nm or less.

As the hollow particles, particles having a pore size corresponding to the pore size may be used. Therefore, the size of the pores may be in the range of approximately 0.5 nm to 100 nm.

In another example, the pore size is about 1 nm or more, about 2 nm or more, about 3 nm or more, about 4 nm or more, about 5 nm or more, about 6 nm or more, about 7 nm or more, about 8 nm or more, about 9 nm or more, about 10 nm or more, about 11 nm Or more, about 12 nm or more, about 13 nm or more, about 14 nm or more, about 15 nm or more, about 16 nm or more, about 17 nm or more, about 18 nm or more, about 19 nm or more, about 20 nm or more, about 21 nm or more, about 22 nm or more, about 23 nm or more, About 24 nm or more, about 25 nm or more, about 26 nm or more, about 27 nm or more, about 28 nm or more, about 29 nm or more, about 31 nm or more, about 32 nm or more, about 33 nm or more, about 34 nm or more, about 35 nm or more, about 36 nm or more, about 37 nm or more, about 38 nm or more, about 99 nm or less, about 98 nm or less, about 97 nm or less, about 96 nm or less, about 95 nm or less, about 94 nm or less, about 93 nm or less, about 92 nm or less, about 91 nm or less, about 90 nm or less, about 89 nm or less, about 88 nm or less, about 87 nm or less, about 86 nm or less, about 85 nm or less, about 84 nm or less, about 83 nm or less, about 82 nm or less, about 81 nm or less, about 79 nm or less, about 78 nm or less, about 77 nm or less, about 76 nm or less , About 75 nm or less, about 74 nm or less, about 73 nm or less, about 72 nm or less, about 71 nm or less, about 69 nm or less, about 68 nm or less, about 67 nm or less, about 66 nm or less, about 65 nm or less, about 64 nm or less, about 63 nm or less, about 62 nm or less, about 61 nm or less, about 59 nm or less, about 58 nm or less, about 57 nm or less, about 56 nm or less, about 55 nm or less, about 54 nm or less, about 53 nm or less, about 52 nm or less, about 51 nm or less, about 50 nm or less, about 49 nm or less , About 48 nm or less, about 47 nm or less, about 46 nm or less, or about 45 nm or less It may be degrees.

As the hollow particles, as long as they have the above characteristics and can exhibit the above-described refractive index characteristics together with a binder, various types may be applied without particular limitation.

For example, as the hollow particles, organic particles in which a shell portion is made of an organic material, inorganic particles made of an inorganic material, and/or organic-inorganic particles made of an organic-inorganic material may be used. These particles include acrylic particles such as PMMA (poly(methyl methacrylate)), epoxy particles, nylon particles, styrene particles, and/or copolymer particles of styrene/vinyl monomers, silica particles, alumina particles, indium oxide particles, and oxidation. Inorganic particles such as tin particles, zirconium oxide particles, zinc oxide particles, and/or titania particles may be exemplified, but are not limited thereto.

The internalization layer or the pore-containing layer may contain the hollow particles in an amount of about 5% by weight or more. In another example, the ratio may be at least about 10%, at least about 15%, at least about 20%, at least about 25%, at least 30%, at least 35%, at least 40%, at least 45%, 50% or more, 55% or more, 60% or more, 65% or more, 70% or more, 75% or more, 80% or more, 85% or more, 90% or more, 95% or more, 100% or more, 105% or more, 110% or more, 115% or more, 120% or more, 125% or more, 130% or more, 135% or more, 140% or more, 145% or more, It may be 150% by weight or more, 155% by weight or more, 160% by weight or more, 165% by weight or more, 170% by weight or more, 175% by weight or more, or 180% by weight or more. In another example, the ratio is about 9,000 wt% or less, 8,000 wt% or less, 7,000 wt% or less, 6,000 wt% or less, 5,000 wt% or less, 4,000 wt% or less, 3 2,000 wt% or less, 1,000 wt% or less, 900 wt% % Or less, 800% or less, 700% or less, 600% or less, 500% or less, 400% or less, 300% or less, about 250% or less, about 240% or less, about 230% or less , It may be about 220% by weight or less, about 210% by weight or less, or about 200% by weight or less.

The ratio of the hollow particles may be adjusted according to the desired properties. In one example, the internalization layer or the pore-containing layer may include only hollow particles as particles. That is, in this example, the internalization layer or the pore-containing layer may not contain so-called solid particles. As a result, it is possible to more appropriately implement the characteristics of the target internalization layer or the pore-containing layer.

The internalization layer or the void-containing layer may contain any additive known in the art as necessary in addition to the above components. Examples of such additives include curing agents or initiators, antioxidants, ultraviolet stabilizers, ultraviolet absorbers, toning agents, defoaming agents, surfactants and/or plasticizers for the binder.

The thickness of the internalization layer or the pore-containing layer can be controlled to express the desired internalization ability. For example, the internalization layer or the pore-containing layer may have a thickness of 200 nm or more. In this thickness range, the desired internalization performance can be effectively expressed. In other examples, the thickness is 250 nm or more, 300 nm or more, 350 nm or more, 400 nm or more, 450 nm or more, 500 nm or more, 550 nm or more, 600 nm or more, 650 nm or more, 700 nm or more, 750 nm or more, It may be about 800 nm or more, 850 nm or more, or 900 nm or more. The upper limit of the thickness is not particularly limited. In general, the thicker the internalization layer, the better the effect of preventing, alleviating, alleviating, suppressing and/or delaying heat. Accordingly, the upper limit of the thickness of the internalization layer or the void-containing layer may be selected in consideration of the thickness required for the optical laminate. In one example, the thickness of the internalization layer or the pore-containing layer is about 3,000 nm or less, 2,900 nm or less, 2,800 nm or less, 2,700 nm or less, 2,600 nm or less, 2,500 nm or less, 2,400 nm or less, 2,300 nm or less, 2,200 nm or less, 2,100 It may be about nm or less, 2,000 nm or less, or 1,950 nm or less.

The position of the internalization layer in the optical laminate can also be controlled to ensure the desired internalization performance.

The internalization layer may be a layer separately included in the optical laminate, or may be a layer implemented by forming voids in a layer (eg, an adhesive layer or an adhesive layer) already existing in the optical laminate.

The position of the internalization layer within the optical laminate can be controlled for the purpose, that is, preventing, alleviating, alleviating, suppressing and/or delaying redundancy.

For example, the internalization layer may be located as close as possible to an optical functional layer that is a major cause of redundancy in the optical laminate. That is, the distance between the internal integration layer and the optical functional layer in the optical laminate can be controlled. In the above, the distance may be a shortest distance, a maximum distance, or an average distance between the surfaces of the internalization layer and the optical functional layer facing each other. In one example, the distance between the internal integration layer and the optical function layer is within 90μm, within 85μm, within 80μm, within 75μm, within 70μm, within 65μm, within 60μm, within 55μm, within 50μm, within 45μm, within 40μm, within 35μm, within 30μm , Within 25μm, within 20μm, within 15μm, within 10μm, within 5μm, within 1 μm, within 0.9 μm, within 0.8 μm, within 0.7 μm, within 0.6 μm, within 0.5 μm, within 0.4 μm, within 0.3 μm or 0.2 μm It can be within. The case where the optical functional layer and the internalization layer are located closest to each other is when the two layers are in contact with each other, and in this case, the distance is 0 μm. Therefore, the lower limit of the distance is 0 μm. In another example, the distance may be about 0.01 μm or more, 0.02 μm or more, 0.03 μm or more, 0.04 μm or more, 0.05 μm or more, 0.09 μm or more, or 0.1 μm or more.

Such an internalization layer may be disposed at a position that does not form the outermost surface of the optical laminate. That is, the internalization layer may not be the outermost layer of the optical laminate. Such positioning may be required to express the resistance to product properties of the optical laminate and/or the optical functional layer.

In another example, the optical laminate may include an additional layer together with the internal integration layer and the optical functional layer, and the internal integration layer may be positioned between the optical functional layer and the additional layer. 1 is an example of such a layer structure, and shows a case in which the additional layer 30, the internalization layer 20, and the optical function layer 10 are sequentially formed. In the above, the additional layer may be a protective film, an adhesive layer, an adhesive layer, a hard coating layer, an antireflection layer, a retardation layer or a brightness enhancement layer, or a cover glass to be described later, but is not limited thereto.

By the above arrangement, the optical laminate of the present application may exhibit a rather high surface reflectance. That is, the internalization layer of the present application may have a function of lowering the reflectance due to its configuration. Since such internalization layer does not exist on the surface, the surface reflectance of the optical functional layer is not formed unless a separate antireflection layer or the like is formed. Can be formed rather high. For example, the optical laminate may have a reflectance of 2% or more. In the above, the reflectance may be light in the visible region, for example, a wavelength within a range of approximately 380 nm to 780 nm, a wavelength within a certain region within the range, or a reflectance for the entire region, or an average reflectance. The reflectance is in another example about 2.5% or more, about 3% or more, about 3.5% or more, or about 4% or more, or about 10% or less, 9% or less, 8% or less, 7% or less, 6% or less, or 5% It may be less than or equal.

By the above arrangement, it is possible to effectively prevent, alleviate, alleviate, suppress and/or delay the redness of the optical functional layer and/or the optical laminate.

The optical laminate may also include various other layers as long as it basically includes the internalization layer and the optical functional layer.

Such a layer may be, for example, a protective film, an adhesive layer, an adhesive layer, a retardation film, a hard coating layer or a low reflection layer for the optical laminate. These layers may also be the additional layers described above.

As the type of the additional layer, a general configuration known in the art may be applied. For example, as the protective film, a resin film having excellent transparency, mechanical strength, thermal stability, moisture barrier property, or isotropic property may be used, and examples of such a film include a cellulose resin film such as a triacetyl cellulose (TAC) film. , Polyester film, polyethersulfone film, polysulfone film, polycarbonate film, polyamide film, polyimide film, polyolefin film, acrylic film, cyclic polyolefin film such as norbornene resin film, polyarylate film, polystyrene film , A polyvinyl alcohol film, etc. can be illustrated. In addition, in addition to the protective layer in the form of a film, a cured resin layer obtained by curing a heat or photocurable resin such as (meth)acrylic, urethane, acrylic urethane, epoxy or silicone may be applied as the protective film. Such a protective film may be formed on one side or both sides of the optical functional layer.

As the retardation film, a general material may be applied, and for example, a birefringent polymer film or an alignment film of a liquid crystal polymer may be uniaxially or biaxially stretched. The thickness of the retardation film is also not particularly limited.

The above-described protective film or retardation film may be attached to an optical functional layer or the like by an adhesive or the like, and the protective film may be subjected to an easy adhesion treatment such as corona treatment, plasma treatment, primer treatment, or saponification treatment. In addition, when the protective film is attached to the optical functional layer or the internal integration layer, a hard coat layer, a low reflection layer, an anti-reflection layer, an anti-sticking layer, There may be a diffusion layer or a haze layer or the like.

In addition to the protective film or the retardation film, various elements such as a reflective plate or a transflective plate may be present in the optical laminate, and the kind is not particularly limited.

An adhesive may be used for bonding each layer of the optical laminate. As the adhesive, an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, a vinyl-based latex-based or water-based polyester may be exemplified, but is not limited thereto. As the adhesive, a water-based adhesive may be generally used, but a solvent-free type photocurable adhesive may be used depending on the type of film to be attached.

The optical laminate may include a pressure-sensitive adhesive layer for adhesion to other members such as a liquid crystal panel or a cover glass. The pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer is not particularly limited, and for example, an acrylic polymer, a silicone polymer, polyester, polyurethane, polyamide, polyether, or a polymer such as fluorine-based or rubber-based polymer can be appropriately selected and used as a base polymer. have. With respect to the exposed surface of the pressure-sensitive adhesive layer, a release film may be temporarily attached and covered for the purpose of preventing contamination or the like until it is provided for practical use.

Such an optical laminate may have various types of structures. For example, FIG. 2 is a structure in which the internalization layer 20 is introduced in the structure of a polarizing plate, which is the most basic optical laminate. That is, the basic polarizing plate has a structure in which a protective film 301 is attached to at least one surface of the polarizing layer 100, and the internalization layer 20 is located between the polarizing layer 100 and the protective film 301 can do. In the structure of FIG. 2, an adhesive or a pressure-sensitive adhesive may be used for bonding each of the layers 100, 20, and 301. In one example, the internalization layer 20 of FIG. 2 may be a separate layer or itself may be the adhesive or pressure-sensitive adhesive. That is, hollow particles or the like may be introduced into an adhesive or pressure-sensitive adhesive to form a void-containing layer to serve as an anti-corrosive layer.

In FIG. 2, a protective film 302 is also attached to the lower side of the polarizing layer 100, that is, on the side opposite to the internalization layer 20, but this protective film 302 is omitted or another kind of layer (for example, the above-described One retardation film or a cured resin layer, etc.). For example, a pressure-sensitive adhesive layer may be formed under the protective film 302 present on the side opposite to the internalization layer 20, that is, on the side opposite to the polarizing layer 100 side of the protective film 302. Alternatively, an adhesive layer may be formed instead of the protective film 302.

3 is a modified structure, in which two protective films 301 and 302 are present on one surface of the polarizing layer 100, and the internalization layer 20 is present between the protective films 301 and 302. Even in this case, a pressure-sensitive adhesive or an adhesive may be applied to the adhesion of the layer, and in this case, the internalization layer 20 may be a pressure-sensitive adhesive or an adhesive. In this structure, matters for the protective film 303 present under the polarizing layer 100 are the same as the case of the protective film 302 present under the polarizing layer 100 in the structure of FIG. 2.

The structures of FIGS. 2 and 3 are examples of the present application, and the optical laminate of the present application may be configured in various other structures.

The present application also relates to a display device including the optical laminate. The type of the display device may be various without particular limitation, for example, a known LCD (Liquid Crystal Display) or OLED (Organic Light Emitting Display), etc., in such a display device, the optical laminate is a conventional method Can be applied as

In particular, the optical laminate is effectively applied to a display device including a so-called cover glass.

Such an apparatus typically includes a cover glass and an optical laminate attached to the cover glass with so-called OCA (Optical Clear Adhesive) or OCR (Optical Clear Resin), and the laminate of the present application may be applied as the optical laminate. Accordingly, the display device includes a cover glass and an optical laminate attached to the cover glass, wherein the optical laminate includes the optical functional layer; And an internalization layer formed on at least one surface of the optical functional layer, wherein the internalization layer may be positioned between the cover glass and the optical functional layer.

In general, a display device including a cover glass is applied to a vehicle navigation or the like. In this case, the redness phenomenon becomes more problematic due to the cover glass having a high thermal conductivity.

However, the optical laminate of the present application can be applied to a device having the above structure to solve the above problem.

The specific structure of the display device is not particularly limited as long as the optical laminate of the present application is applied, and may follow a known structure.

In the present application, an optical laminate or a display device or an internally applied layer applied thereto may be provided that does not cause a so-called redundancy phenomenon even when driven or maintained under a very severe condition (eg, a very high temperature condition).

1 to 3 are views for explaining an exemplary structure of an optical laminate of the present application.

Hereinafter, the polarizing layer and the like will be described in more detail through examples according to the present application, but the scope of the present application is not limited to the following.

Physical properties in the present specification were measured in the following manner.

1. Measurement of thickness

The thickness of the polarizing layer and the internalization layer may be measured by applying a transmission electron microscopy (TEM) device. After photographing a cross section of the polarizing layer or the internal integration layer with the TEM device, the thickness of the corresponding layer can be checked from the photographed image. In this example, Hitachi's H-7650 product was used as a TEM device.

2. Measurement of particle size distribution and pore size of hollow particles

The particle size distribution of the hollow particles was measured using the ELSZ-2000 equipment of Otsuka Electronics. In addition, the particle diameter and pore size of the hollow particles were measured by applying a TEM (Transmission Electron Microscopy) device. In this example, Hitachi's H-7650 product was used as a TEM device. The particle diameter and pore size are determined by randomly selecting 50 hollow particles after photographing (10,000 times magnification) a cross section of the internalization layer in the optical laminate (polarizing plate) manufactured in Examples, etc. using the TEM device. The particle diameter and pore size were determined, and the arithmetic mean was taken as a representative value of the particle diameter and pore size.

3. CIE color coordinate measurement

Color coordinates were measured using a JASCO V-7100 Spectrophotometer. The JASCO V-7100 spectrophotometer rotates the absorption axis of the polarizing plate to be measured from 0 degrees to 360 degrees with respect to the absorption axis of the polarizer built into the device, and then measures the color coordinate (TD color coordinate) at the point where the transmittance is minimum. , After measuring the color coordinate (MD color coordinate) by rotating the absorption axis of the polarizing plate to be measured 90 degrees clockwise at the point where the transmittance is minimum, it is a device that derives a representative value of the color coordinate based on each measured value. The color coordinates described in the examples of this specification are the color coordinates identified by the JASCO V-7100 spectrophotometer.

4. Measurement of transmittance

The single transmittance of the polarizing plate and the like were measured using a JASCO V-7100 Spectrophotometer. The JASCO V-7100 spectrophotometer is a device that measures the transmittance of a polarizing plate within a range of 380 to 780 nm and derives a representative value for the wavelength range.In this embodiment, the JASCO V- The transmittance confirmed by the 7100 Spectrophotometer is described.

5. Measurement of the weight ratio of potassium (K) and zinc (Zn) in the polarizing layer

The weight ratio of potassium (K) and zinc (Zn) present in the polarizing layer was measured in the following manner. First, about 0.1 g of the polarizing layer is dissolved in an aqueous nitric acid solution (2 mL) having a concentration of about 65% by weight at room temperature (about 25°C), and then diluted to 40 mL with deionized water, and then ICP-OES (Optima 5300) is used. Thus, the weights of potassium (K) and zinc (Zn) contained in the polarizing layer were measured, respectively.

6. Evaluation of thermal diffusivity of the interlayer

Thermal diffusivity was measured in the following manner. The thermal diffusivity was evaluated in a state in which an interlayer (pore-containing layer) was formed on a TAC (Triacetyl cellulose) film (manufactured by Hyosung, PG601F) having a thickness of about 60 μm in the manner described in the following Examples. At this time, the thickness of the internalization layer (the void-containing layer) is described in each of the Examples. Graphite coating was performed on the upper and lower surfaces of the laminate of the TAC film/internalization layer (pore-containing layer). The graphite coating was formed using CRAMLIN's GRAPHITE product. The product is a product that can be coated with graphite by spraying, and the product is sprayed once on the upper surface (surface of the interlayer (pore-containing layer)) and the lower surface (TAC film) of the laminate, and then dried to form the graphite layer. Formed. After that, the thermal diffusivity was measured using an LFA 457 MicroFlash product of NETZSCH. The thermal diffusivity was measured based on a temperature of 95°C, and it was confirmed through whether or not the temperature was transferred from one graphite surface to another graphite surface. In this way, the thermal diffusivity of the laminate (internalization layer (pore-containing layer)/TAC film) was evaluated, and in Examples, the relative ratio of the thermal diffusivity of the laminate to the TAC film was described.

7. Evaluation of infrared reflectance of the internal layer

The infrared reflectance of the internalization layer was confirmed in the following manner. In the manner described in the following examples, the infrared reflectance was evaluated in a state in which an internal layer was formed on a triacetyl cellulose (TAC) film having a thickness of about 60 μm. At this time, the thickness of the internalization layer is described in each example. A black tape (black PET film from TOMOEGAWA) was applied to the lower surface of the TAC film of the laminate of the interlayer/TAC film (the surface of the film on which the interlayer was not formed) for darkening treatment, and then Solidspec 3700 from SHIMADZU. Using the instrument, the average reflectance in the 800 to 1300 nm wavelength region was measured in the reflectance mode. Using the above device, it is possible to check the reflectance for a wavelength range of 1 nm interval within the range of 800 nm to 1300 nm, and in this embodiment, the arithmetic average value of the reflectance for each wavelength was taken as a representative value of the infrared reflectance.

8. Evaluation of Small Angle X-ray Scattering (SAXS) of the Internal Integration Layer

The evaluation of small-angle X-ray scattering of the internalized layer was performed in the following manner. In the manner described in the following examples, the evaluation was performed in a state in which an internal layer was formed on a triacetyl cellulose (TAC) film having a thickness of about 60 μm. At this time, the thickness of the internalization layer is described in each example. A test piece is prepared by cutting the laminate of the TAC film/internalization layer so that the width and length are about 1 cm, respectively. X-rays having a wavelength of 0.0733 nm were irradiated at a distance of 4 m to the internal integration layer of the test piece to obtain scattering intensity according to the scattering vector. The measurement was performed on a 4C beamline of the Pohang accelerator, and an X-ray having a vertical size of about 0.023 mm and a horizontal size of about 0.3 mm was used. A 2D mar CCD was used as a detector. After obtaining an image of the scattered 2D diffraction pattern, it is calibrated using the sample-to-detector distance obtained through a standard sample (polyethylene-block-polybutadiene-block-polystyrene, SEBS), and the scattering vector (q) through circular average. The scattering intensity according to was converted. At this time, the scattering vector was calculated according to Equation A below.

[Equation A]

q = 4πsinθ/λ

In Equation A, q is the scattering vector, θ is a value of 1/2 times the scattering angle (unit: degrees), and λ is the wavelength of the irradiated X-ray (unit: angstrom (Å)).

9. Cauchy Parameter Measurement

)))를 Complete EASE software를 이용하여 하기 Cauchy model의 MSE가 25 이하가 되도록 최적화(fitting)하여 하기 수식 6의 n(

), A, B 및 C를 구하였다. 최적화 과정에서 Roughness 기능을 on (범위: 20~50 nm)으로 하여 적용하였다.The refractive index and Cauchy parameter of the internalization layer were performed in the following manner. In the manner described in the following examples, the evaluation was performed in a state in which an internal layer was formed on a triacetyl cellulose (TAC) film having a thickness of about 60 μm. At this time, the thickness of the internalization layer is described in each example. The above properties were evaluated using the equipment (JA Woollam Co. M-2000) for the laminated body (internalization layer/TAC film) for the internalization layer. Linearly polarized light was measured in a wavelength range of 380 nm to 1,000 nm under the condition of an incidence angle of 70 degrees by applying the above equipment to the internalization layer. Measured linearly polarized data (Ellipsometry data (Psi(Ψ), delta(

))) using Complete EASE software to optimize (fitting) the MSE of the following Cauchy model to be 25 or less, and then n (

), A, B and C were obtained. In the optimization process, the Roughness function was turned on (range: 20-50 nm) and applied.

[Equation 6]

In Equation 6, n(λ) is the refractive index at the wavelength λ nm.

10. Evaluation of the surface area ratio of the internal layer

The surface area ratio of the internalization layer (pore-containing layer) was measured using an AFM instrument (Atomic Force Microscope, Park Systems, XE7). A sample prepared by cutting a laminate having an internalization layer (a void-containing layer) formed on one side of the TAC film as described in Example to have a horizontal and vertical length of 1 cm was fixed to the stage of the device using a carbon tape, and measured. Was performed. As a tip for the measurement, PPP-NCHR 10 (Force Constant: 42 N/m, Resonance Frequency 330 kHz) was used. Measurement conditions are as follows.

<Measurement conditions>

x-scan size: 1μm

y-scan size: 1μm

Scan rate: 0.7 to 1Hz

Z Servo Gain: 1

Set Point: 10 to 15 nm

The data measured under the above conditions were flattened under the following conditions using the XEI program.

<flattening conditions>

Scope: Line

Orientation: X and Y axis

Regression Order: 1

After planarization, the surface area ratio was extracted from the Region tab in the XEI program.

Preparation Example 1. Preparation of polarizing layer (A)

의 수용액에 30초 동안 침지시켰다. 이후, PVA 필름을 80℃의 온도에서 60초 동안 건조시켜 PVA 편광층을 제조하였다. 상기 제조된 편광층의 최종 두께는 약 12㎛ 정도였으며, 칼륨 함량은 약 0.9 중량%이고, 아연 함량은 약 0.3 중량%였다. 또한, 1/(1+0.025d/R)는 약 0.9였다. 상기에서 d는 편광층의 두께(12㎛)이고, R은 편광층에 포함되어 있는 칼륨 성분의 중량비(K, 단위: weight)과 아연 성분의 중량비(Zn, 단위: weight)의 비율(K/Zn)이다.PVA (poly(vinyl alcohol)) film (Japan Synthetic Company, M3004L) having a thickness of about 30 µm was added to a dyeing solution at 28°C containing 0.2% by weight _{of iodine (I 2) and 2.5% by weight of potassium iodide (KI).} Dyeing was performed by immersing for seconds. Subsequently, the dyed PVA film was immersed in an aqueous solution (crosslinking solution) of 35° C. containing 1% by weight of boron and 3% by weight of potassium iodide (KI) for 60 seconds to perform crosslinking treatment. Thereafter, the crosslinked PVA film was stretched at a draw ratio of 5.4 times using the stretching method between rolls. The stretched PVA film was washed by immersing it in ion-exchanged water at 25° C. for 60 seconds, and 25 containing 2% by weight of zinc nitrate and 5% by weight of potassium iodide (KI).

It was immersed in the aqueous solution for 30 seconds. Thereafter, the PVA film was dried at a temperature of 80° C. for 60 seconds to prepare a PVA polarizing layer. The resulting polarizing layer had a final thickness of about 12 μm, a potassium content of about 0.9% by weight, and a zinc content of about 0.3% by weight. In addition, 1/(1+0.025d/R) was about 0.9. In the above, d is the thickness of the polarizing layer (12㎛), R is the ratio of the weight ratio (K, unit: weight) of the potassium component contained in the polarizing layer and the weight ratio (Zn, unit: weight) of the zinc component (K/ Zn).

Preparation Example 2. Preparation of polarizing layer (B)

A polarizing layer was prepared using a PVA (poly(vinyl alcohol)) film (Japan Synthetic Company, M4504L) having a thickness of about 45 µm as the original film. First, a swelling treatment was performed on the original film. The swelling treatment was performed by immersing the original film in pure water at a temperature of 25° C. for 30 seconds. In the swelling treatment process, stretching was performed so that about 28% of the final draw ratio was stretched. Subsequently, a dyeing treatment was performed using a dye solution in which iodine (I ₂ ) and potassium iodide (KI) were dissolved in a concentration of 0.2% by weight and 2.5% by weight, respectively. The dyeing treatment was performed by immersing the original film in the dyeing solution at 28° C. for about 2 minutes. In this process, stretching was performed so that about 40% of the final draw ratio was stretched. Thereafter, the dyed PVA film was crosslinked by immersing it in an aqueous solution (crosslinking solution) of 35° C. containing 1% by weight of boron and 3% by weight of potassium iodide for 60 seconds. Subsequently, the original film was stretched. Stretching was performed in an aqueous solution (treatment liquid) containing about 3% by weight of each of boric acid and potassium iodide. The temperature of the treatment liquid was about 50°C. Subsequently, the stretched film was washed with an aqueous solution. At this time, the temperature of the aqueous solution was about 25°C, and the washing treatment was performed within 1 minute. Thereafter, the film was dried to prepare a PVA polarizing layer (thickness: 27 μm, total draw ratio: 5.4 times).

Preparation Example 3. Preparation of the material for the internalization layer (A)

TMPTA (trimethylolpropane triacrylate) was applied as a binder, and hollow silica particles were applied to prepare an anti-corrosion layer. As the hollow silica particles, particles having D10, D50, and D90 particle diameters of 32.1 nm, 62.6 nm and 123.4 nm, respectively, were used. In this case, after forming the internalization layer, the average of the pore sizes measured by TEM was about 38.3 nm, and the particle diameter was about 53 nm. The binder, the hollow silica particles, a fluorinated compound (RS-90, DIC) and an initiator (Irgacure 127, Ciba) were used in a weight ratio of 31:65:0.1:3.9 based on solid content (binder: hollow silica particles: contained A fluorine compound: initiator) was diluted in MIBK (methyl isobutyl ketone) as a solvent to prepare a coating solution.

Preparation Example 4. Preparation of the material for the internalization layer (B)

TMPTA (trimethylolpropane triacrylate) was applied as a binder, and hollow silica particles were applied to prepare an anti-corrosion layer. As the hollow silica particles, particles having D10, D50, and D90 particle diameters of 39.9 nm, 70.6 nm and 126.0 nm, respectively, were used. In this case, after forming the internalization layer, the average of the pore sizes measured by TEM was about 44.1 nm, and the particle diameter was about 61 nm. The binder, the hollow silica particles, the fluorinated compound (RS-90, DIC) and the initiator (Irgacure 127, Ciba) were mixed in a weight ratio of 55.1:40:1.1:3.8 (binder: hollow silica particles: fluorinated compound: Initiator) was diluted in MIBK (methyl isobutyl ketone) as a solvent to prepare a coating solution.

Preparation Example 5. Preparation of the material for the internalization layer (C)

PETA (Pentaerythritol triacrylate) was applied as a binder, and hollow silica particles were applied to prepare an anti-corrosion layer. As the hollow silica particles, particles having D10, D50 and D90 particle diameters of 39.9 nm, 70.6 nm and 126.0 nm, respectively, were used. In this case, after forming the internalization layer, the average of the pore sizes measured by TEM was about 44.1 nm, and the particle diameter was about 61 nm. The binder, the hollow silica particles, the fluorinated compound (RS-90, DIC) and the initiator (Irgacure 127, Ciba) were mixed in a weight ratio of 76.5:20:0.5:3.0 (binder: hollow silica particles: fluorinated compound: Initiator) was diluted in MIBK (methyl isobutyl ketone) as a solvent to prepare a coating solution.

Preparation Example 6. Preparation of the material for the internalization layer (D)

PETA (Pentaerythritol triacrylate) was applied as a binder, and hollow silica particles were applied to prepare an anti-corrosion layer. As the hollow silica particles, particles having D10, D50 and D90 particle diameters of 39.9 nm, 70.6 nm and 126.0 nm, respectively, were used. In this case, after forming the internalization layer, the average of the pore sizes measured by TEM was about 44.1 nm, and the particle diameter was about 61 nm. The binder, the hollow silica particles, a fluorinated compound (RS-90, DIC) and an initiator (Irgacure 127, Ciba) were mixed in a weight ratio of 86.5:10:0.5:3.0 (binder: hollow silica particles: fluorinated compound: Initiator) was diluted in MIBK (methyl isobutyl ketone) as a solvent to prepare a coating solution.

Example 1.

An internalization layer (pore-containing layer) was formed on a TAC (Triacetyl cellulose) film (manufactured by Hyosung, PG601F) having a thickness of about 60 μm. The fire resistant layer was formed by coating the material of the fire resistant layer (A) of Preparation Example 3 with Mayer bar, drying at about 60° C. for about 1 minute, and irradiating with ultraviolet rays (252 mJ/cm ² ) to have a final thickness of about 450 nm. I did.

Example 2.

The coating solution of Preparation Example 4 was coated on the same TAC film as in Example 1 using a Mayer bar, dried at 60° C. for 1 minute, and then irradiated with ultraviolet rays (252 mJ/cm ² ) to form an internal layer so that the final thickness was 600 nm. Formed.

Example 3.

The coating material of Preparation Example 5 was used to form an anti-corrosion layer (a void-containing layer) in the same manner as in Example 1, but the final thickness of the void-containing layer was formed to be about 950 nm.

Example 4.

An internalization layer was prepared in the same manner as in Example 1, except that the thickness of the pore-containing layer was changed to about 300 nm.

Example 5.

An internalization layer was prepared in the same manner as in Example 1, except that the thickness of the pore-containing layer was changed to about 400 nm.

Example 6.

A fire resistant layer was prepared in the same manner as in Example 1, except that a void-containing layer having a thickness of about 500 nm was formed by applying the coating material of the fire resistant layer of Preparation Example 5.

Example 7.

An internalization layer was manufactured in the same manner as in Example 6, except that the coating material for the internalization layer of Preparation Example 4 was applied.

Example 8.

An internalization layer was manufactured in the same manner as in Example 6, except that the coating material for the internalization layer of Preparation Example 3 was applied.

Example 9

The internalization layer was manufactured in the same manner as in Example 6, except that the material of Preparation Example 6 was applied to form a void-containing layer having a thickness of about 3000 nm.

The properties of the internalization layer formed in each of the above examples are summarized and described in Table 1 below. The surface area ratio shown in Table 1 below is a result of the surface of the void-containing layer in contact with the TAC film and the surface on the opposite side.

Inner layer Cauchy Parameter coefficient IR reflectance (%) Scattering vector (nm ^-1 ) Relative Ratio (%): Surface Area Ratio A B C room
city
Yes One 1.331 0.00287 0.000101 3.34 0.132 60% 0.148 2 1.335 0.00363 0.000244 3.76 0.128 62% 0.0359 3 1.332 0 0.000347 2.71 0.13 63% 0.109 4 1.333 0.000485 0.00025979 3.51 0.122 64% 0.0715 5 1.332 0.00172 0.000301 3.4 0.123 60% 0.1643 6 1.453 0.00319 0.000339 4.4 0.1 67% 0.2207 7 1.401 0.00485 0.000025979 3.58 0.126 67% 0.0387 8 1.315 0.000258 0.0000134 2.85 0.141 60% 0.0513 9 1.489 0.000104 0.0000804 4.1 0.184 - - IR reflectance: infrared reflectance
Scattering Vector: Scattering vector in which a peak is confirmed in the logarithmic graph of the scattering intensity of small-angle X-ray scattering
_{Relative ratio: The ratio of the thermal diffusivity (H L} ) of the TAC film/internalization layer (pore-containing layer) laminate to the thermal _{diffusivity (H P} ) of the TAC film (100×H _L /H _P )

Example 10.

A general optical water-based adhesive layer (thickness: 100 nm) was applied to the polarizing layer (A) obtained in Preparation Example 1 to attach a COP (Cycloolefin Polymer) film (manufacturer: Zeon) having a thickness of about 30 μm as a protective film. To the polarizing layer (B) of the laminate of the prepared COP film and the polarizing layer (B), the void-containing layer of the internalization layer of Example 1 was attached with the same water-based adhesive (thickness: 100 nm) as described above. At the time of attachment, a portion of the void-containing layer having a surface area ratio described in Table 1 was attached to the polarizing layer. Subsequently, an acrylic adhesive layer was formed under the polarizing plate, and a protective film (COP film), an adhesive layer, a polarizing layer, an adhesive layer, an anti-corrosion layer (a void-containing layer), a protective film (TAC film), and an adhesive layer were sequentially stacked (Optical laminate) was prepared.

Example 11.

A polarizing plate was manufactured in the same manner as in Example 10, except that the internalization layer prepared in Example 2 was applied.

Example 12.

A polarizing plate was manufactured in the same manner as in Example 10, except that the internalization layer prepared in Example 3 was applied.

Comparative Example 1.

A polarizing plate was manufactured in the same manner as in Example 10, except that the internalization layer was not applied.

Example 13.

A polarizing plate was manufactured in the same manner as in Example 10, except that the internalization layer prepared in Example 4 was applied.

Example 14.

A polarizing plate was manufactured in the same manner as in Example 10, except that the internalization layer prepared in Example 5 was applied.

Comparative Example 2.

A polarizing plate was manufactured in the same manner as in Example 13, except that the internalization layer was not applied.

Example 15.

A polarizing plate was manufactured in the same manner as in Example 10, except that the internalization layer prepared in Example 6 was applied.

Example 16.

A polarizing plate was manufactured in the same manner as in Example 15, except that the internalization layer prepared in Example 7 was applied.

Example 17.

A polarizing plate was manufactured in the same manner as in Example 15, except that the internalization layer prepared in Example 8 was applied.

Example 18

A polarizing plate was manufactured in the same manner as in Example 15, except that the internalization layer prepared in Example 9 was applied.

The optical laminates (polarizing plates) of the above Examples and Comparative Examples were subjected to a heat resistance test, and then the single transmittance and the amount of change in the color coordinate a* were evaluated and summarized in Table 2 below. In the heat resistance test, the top and bottom surfaces of the polarizing plates manufactured in each Example or Comparative Example were laminated by contacting soda lime glass (Sewon Tech Co., Ltd.) having a thickness of about 1.1 mm, and maintained at 105° C. for 250 hours Was carried out. In addition, it is summarized and described in Table 2 below as NG when it is confirmed by observing whether or not redness is observed with the naked eye, and PASS when it is not confirmed (in Table 2 below, the unit of transmittance is %).

Early Maintain 250 hours at 105℃ Transmittance a* Transmittance a* Visually Transmittance
Change a*
Change room
city
Yes 10 41.3 -1.47 40 -0.87 PASS -1.3 0.6 11 41.5 -2.05 40.6 -1.95 PASS -0.9 0.1 12 41.3 -1.66 40.5 -1.56 PASS -0.8 0.1 13 41.5 -3.1 41.2 -1.9 PASS -0.3 1.2 14 41.6 -3.4 40.6 -2.4 PASS -One One 15 41.4 -1.88 41.8 -2 PASS 0.4 -0.12 16 41.1 -2.01 41.5 -2.03 PASS 0.4 -0.02 17 40.7 -1.93 41.9 -2.08 PASS 1.2 -0.15 18 41.3 -1.94 42 -2.14 PASS 0.7 -0.2 compare
Yes One 41.8 -1.8 31.8 2 NG -10 3.8 2 41.3 -3.4 31.3 -3.2 NG -10 6.6

Claims (13)

An anti-corrosion layer having a pore-containing layer including at least one surface having a surface area ratio of 0.02 or more as measured by an atomic force microscope. The internally integrated layer according to claim 1, wherein the void-containing layer exhibits at least one peak within a range of a scattering vector of ^{0.06 to 0.209 nm -1} in a log value graph of the scattering intensity of small-angle X-ray scattering. The anti-corrosion layer according to claim 1, wherein the void-containing layer has a reflectance of 2% or more for a wavelength of 800 nm to 1300 nm. The internalization layer according to claim 1, wherein the diameter of the pores of the pore-containing layer is in the range of 0.5 to 100 nm. The anti-corrosion layer according to claim 1, wherein the void-containing layer has an A value of 1.5 or less, a B value of 0 to 0.01, and a C value of 0 to 0.001 satisfying Equation 6 below:
[Equation 6]

In Equation 6, n(λ) is the refractive index of the internal integration layer at the wavelength λ, and λ is any one wavelength in the range of 300 to 1800 nm. The internalization layer according to claim 1, wherein the pore-containing layer has a volume fraction of the pores of 0.1 or more. The internalization layer according to claim 1, wherein the void-containing layer contains a binder and hollow particles. The internal layer of claim 7, wherein the hollow particles have a D10 particle diameter, a D50 particle diameter, and a D90 particle diameter in the range of 25 nm to 50 nm, 50 nm to 95 nm, and 100 nm to 200 nm, respectively, in the weight accumulation curve of the particle size distribution. 8. The internalization layer according to claim 7, wherein the pore-containing layer comprises at least 5% by weight of hollow particles. The internalization layer according to claim 1, wherein the pore-containing layer has a thickness of 200 nm or more. Optical functional layer; And the internal integration layer of claim 1 formed on at least one surface of the optical functional layer. The optical layered product according to claim 11, wherein the internalization layer is attached to the optical functional layer, and the surface of the pore-containing layer of the internalization layer having a surface area ratio of 0.02 or more as measured by an atomic force microscope is a surface facing the optical functional layer. The optical laminate according to claim 11, wherein the optical functional layer is a polarizing layer or a retardation layer.

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