Hard coat film, polarizing plate using same, and optical member

Abstract

To provide a hard coat film having a hard coat layer containing a styrene filler, in which deterioration of the styrene filler due to ultraviolet rays is suppressed, and to provide a polarizing plate using the hard coat film and an optical member such as a display device.SOLUTION: Provided is a hard coat film having a hard coat layer on a transparent support, the hard coat layer being a cured film of a composition containing 100 pts.mass of an acrylate compound, 1.5-25 pts.mass of an ultraviolet absorber, 0.1-15 pts.mass of a photopolymerization initiator, and 0.1-15 pts.mass of a styrene filler, a proportion of the ultraviolet absorber existing in a region within 30% of a thickness of the hard coat layer from a surface of the hard coat layer being 40 mass% or more and 50 mass% or less, and a light transmittance at a wavelength of 380 nm being 10% or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hard-coated film, a polarizing plate using the same, and an optical member using the same. [Background technology]

[0002] Hard coat films (HC films) are used on the outermost surfaces of display devices such as smartphones, tablets, laptops, and monitor televisions (Patent Document 1). A hard coat film has a hard coat layer (HC layer) made of a cured film of a resin composition formed on one surface of a transparent support.

[0003] Since hard coat films are provided for the purpose of improving scratch resistance, they are required to have surface hardness and durability, but they are also required to have light transmittance and anti-glare properties so that the visibility of the display device is not hindered by the hard coat film. Furthermore, in consideration of the case where a device vulnerable to ultraviolet light, such as an OLED (organic emitting diode), is used as the light source of the display device, a hard coat film having ultraviolet blocking properties is also required. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6577768 Summary of the Invention [Problem to be solved by the invention]

[0005] Antiglare properties can be obtained by adding a styrene filler to the hard coat layer, but because the styrene filler has a conjugated double bond, it breaks down when it absorbs ultraviolet light, resulting in problems such as a decrease in antiglare properties and yellowing of the hard coat layer, which reduces the clarity of images on display devices.

[0006] Therefore, an object of the present invention is to provide a hard-coated film having a hard-coat layer containing a styrene filler, in which deterioration of the styrene filler due to ultraviolet light is suppressed, and to provide an optical member such as a polarizing plate and a display device using the hard-coated film. [Means for solving the problem]

[0007] The hard coat film according to the present invention is a hard coat film having a hard coat layer provided on a transparent support, wherein the hard coat layer contains 1.5 to 25 parts by mass of an ultraviolet absorber, 0.1 to 15 parts by mass of a photopolymerization initiator, and 0.1 to 15 parts by mass of a styrene filler relative to 100 parts by mass of an acrylate compound, the proportion of the ultraviolet absorber present in a portion within 30% of the thickness of the hard coat layer from the surface of the hard coat layer being 40% to 50% by mass, and the transmittance of light with a wavelength of 380 nm being 10% or less.

[0008] The polarizing plate according to the present invention uses the above hard coat film.

[0009] The optical member according to the present invention uses the above polarizing plate. [Effects of the Invention]

[0010] According to the present invention, there is provided a hard-coated film having a hard-coat layer containing a styrene filler, in which deterioration of the styrene filler due to ultraviolet light is suppressed, and optical components such as a polarizing plate and a display device using the hard-coated film can also be provided. [Brief explanation of the drawings]

[0011] [Figure 1] Schematic cross-sectional view of a hard coat film according to an embodiment. [Figure 2] Enlarged cross-section of hard coat film [Figure 3]Graph showing the relationship between the depth of the hard coat layer and the ratio of the amount of ultraviolet absorber (I1230 / I1720) in the acrylate compound [Figure 4] Graph showing the total abundance ratio of ultraviolet absorbers versus the depth of the hard coat layer DETAILED DESCRIPTION OF THE INVENTION

[0012] FIG. 1 is a schematic cross-sectional view of a hard coat film according to an embodiment, and FIG. 2 is a partially enlarged view of the cross section of the hard coat film.

[0013] The hard coat film 1 has a hard coat layer 3 provided on one surface of a transparent support 2. The hard coat film 1 can be used as a polarizing plate in combination with a polarizer. The polarizing plate is used in optical components such as display devices. Examples of display devices include smartphones, tablets, laptops, and monitor televisions.

[0014] (transparent support) The transparent support 2 is a film that serves as the base of the hard coat film 1. The transparent support 2 is not particularly limited as long as it is a film made of a material that has excellent transparency and transmittance to visible light, but for example, a film made of any of the following materials can be used: triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), cycloolefin polymer (COP), and polyimide (PI).

[0015] The thickness of the transparent support 2 is preferably 11 to 50 μm. If the thickness of the transparent support 2 is less than 11 μm, the transparent support 2 becomes too thin, resulting in a decrease in the hardness of the hard coat layer 3 and the strength of the hard coat film 1. On the other hand, if the thickness of the transparent support 2 exceeds 50 μm, the hard coat film 1 becomes too thick, which will not contribute to reducing the thickness of display devices such as displays using the hard coat film 1.

[0016] (Hard coat layer) The hard coat layer 3 is a functional layer that coats the flexible transparent support 2 and imparts hardness to the hard coat film 1. The hard coat layer 3 can be formed by applying and curing a coating liquid containing an active energy ray-curable resin, an ultraviolet absorber, a styrene filler, and a photopolymerization initiator.

[0017] The hard coat layer 3 according to this embodiment contains a styrene filler to exhibit anti-glare properties. Styrene fillers have conjugated double bonds (benzene rings), and therefore break down when they absorb ultraviolet light, causing a decrease in anti-glare properties and yellowing of the hard coat layer 3. Therefore, in this embodiment, an ultraviolet absorber is segregated on the surface of the hard coat layer 3 to protect the styrene filler in the hard coat layer 3 from ultraviolet light. Furthermore, when a device that is vulnerable to ultraviolet light, such as an OLED (organic emitting diode), is used as the light source of the display device, it is preferable that the hard coat layer 3 contains an ultraviolet absorber, since this can protect the device from external ultraviolet light.

[0018] The thickness of the hard coat layer 3 is preferably 4 to 15 μm. If the thickness of the hard coat layer 3 is less than 4 μm, the hardness of the hard coat layer 3 will be insufficient. On the other hand, if the thickness of the hard coat layer 3 exceeds 15 μm, the thickness of the hard coat film 1 will be too large, which will not contribute to making the optical member using the hard coat film 1 thinner.

[0019] The active energy ray-curable resin is preferably an acrylate compound having an aromatic ring, and preferably contains a high-molecular-weight compound having a weight-average molecular weight of 1,000 to 100,000 and a low-molecular-weight compound having a weight-average molecular weight of less than 1,000. The aromatic ring may be contained in either the high-molecular-weight compound or the low-molecular-weight compound. Here, the high-molecular-weight compound is a component added to suppress curling and impart toughness. Furthermore, the mass ratio of the high-molecular-weight compound to the low-molecular-weight compound is preferably 10:90 to 50:50. When the mass ratio of the high-molecular-weight compound to the low-molecular-weight compound is within this range, the UV absorber is more likely to segregate on the surface of the hard coat layer 3. On the other hand, when the mass ratio of the low-molecular-weight compound to the high-molecular-weight compound is less than 50:50, the UV absorber is less likely to segregate on the surface of the hard coat layer 3. This is because the UV absorber and the low-molecular-weight compound are separated due to the difference in their molecular weights. Segregation of the ultraviolet absorber on the surface of the hard coat layer 3 allows ultraviolet rays contained in external light to be absorbed on the surface of the hard coat layer 3, thereby reducing the amount of ultraviolet rays absorbed by the styrene filler in the hard coat layer 3. This makes it possible to suppress a decrease in antiglare properties due to the breakdown of the styrene filler by ultraviolet rays, and a decrease in the clarity of the display device due to yellowing of the hard coat layer 3.

[0020] The UV absorber is a component that imparts UV-blocking properties to the hard coat layer 3 itself. When the UV absorber segregates on the surface of the hard coat layer 3, it can prevent the styrene filler in the hard coat layer 3 from absorbing UV rays. More specifically, it is preferable that 40% to 50% by mass of the total UV absorber present in the hard coat layer 3 is present in a portion X within 30% of the thickness (depth 30%) of the hard coat layer 3, based on the surface of the hard coat layer 3 (the surface opposite the transparent support 2, hereinafter sometimes referred to as 0% depth). If the UV absorber present within 30% of the depth from the surface of the hard coat layer 3 is less than 40% by mass, the UV absorber segregating to the surface of the hard coat layer 3 is small, and the amount of UV absorbed by the styrene filler increases. If it exceeds 50%, the surface hardness of the hard coat layer 3 decreases. The amount of UV absorber added is preferably 1.5 to 25 parts by mass per 100 parts by mass of the total acrylate compounds. If the amount of the ultraviolet absorber is less than 1.5 parts by mass, the ultraviolet blocking performance will be insufficient, and if it exceeds 25 parts by mass, the curability of the hard coat layer 3 will decrease and sufficient hardness will not be obtained.

[0021] The styrene filler is added to the hard coat layer 3 to provide antiglare properties. The amount of the styrene filler added is preferably 0.1 to 15 parts by mass per 100 parts by mass of the total acrylate compounds. If the amount of the styrene filler added is less than 0.1 part by mass, the antiglare properties of the hard coat layer 3 will not be sufficient, and if it exceeds 15 parts by mass, the transparency of the hard coat layer 3 will be impaired, and the clarity of the image will also be impaired.

[0022] The amount of the photopolymerization initiator added is preferably 0.1 to 15 parts by mass per 100 parts by mass of the total of the acrylate compounds. If the amount of the photopolymerization initiator added is less than 0.1 part by mass, the curability of the hard coat layer 3 decreases, making it impossible to obtain sufficient surface hardness. If the amount of the photopolymerization initiator added is more than 15 parts by mass, the curability of the hard coat layer 3 becomes too strong, impairing the adhesion between the hard coat layer 3 and the transparent support 2.

[0023] In the hard coat film 1 according to this embodiment, the transmittance of the hard coat layer 3 at a wavelength of 380 nm is preferably 10% or less, which can prevent the light source of a display device, such as an OLED, which is vulnerable to ultraviolet light, from being deteriorated by external ultraviolet light.

[0024] The amount of the ultraviolet absorber added to the hard coat layer 3 is 1.5 to 25 parts by mass with respect to 100 parts by mass of the total of the acrylate compounds, and therefore the hard coat layer 3 has excellent ultraviolet blocking performance.

[0025] Furthermore, 40% to 50% of the total ultraviolet absorber present in the hard coat layer is present in portion X of the hard coat layer 3. Therefore, the ultraviolet absorber can be sufficiently segregated on the surface of the hard coat layer 3, and sufficient surface hardness can be imparted to the hard coat layer 3.

[0026] The amount of styrene filler added is 0.1 to 15 parts by mass per 100 parts by mass of the total of the acrylate compounds, which allows the hard coat layer 3 to have sufficient antiglare properties and prevents the transparency of the hard coat layer 3 from being impaired, thereby preventing a decrease in image clarity.

[0027] The mass ratio of the high molecular weight compound to the low molecular weight compound contained in the acrylate compound is 10:90 to 50:50. This facilitates segregation of the UV absorber on the surface of the hard coat layer 3, thereby reducing the amount of UV light absorbed by the styrene filler. This prevents the styrene filler from absorbing UV light and breaking down, and also prevents a decrease in antiglare properties and a decrease in the clarity of the display device due to yellowing of the hard coat layer 3.

[0028] The photopolymerization initiator is added in an amount of 0.1 to 15 parts by mass per 100 parts by mass of the total of the acrylate compounds, thereby providing the hard coat layer 3 with sufficient surface hardness and preventing the hard coat layer 3 from having too strong a curing property, which would impair the adhesion between the hard coat layer 3 and the transparent support 2. [Example]

[0029] Examples of specific implementations of the present invention will be described below.

[0030] In Examples 1 to 14 and Comparative Examples 1 to 9, a 25 μm-thick triacetyl cellulose film was used as the transparent support. The hard coat layer-forming composition was prepared by mixing a high molecular weight compound, a low molecular weight compound (NK Ester A-TMM-3L manufactured by Shin-Nakamura Chemical Co., Ltd.), an ultraviolet absorber (Tinuvin® 477 manufactured by BASF Japan Ltd.), a photopolymerization initiator (Omnirad® 184 manufactured by IGM Resins), and a styrene filler in the ratios shown in Table 1. The blending amounts of the materials in Table 1 are in parts by mass relative to a total of 100 parts by mass of the acrylate compounds.

[0031] The hard coat layer-forming composition was applied to one side of the transparent support by bar coating and dried, and then the coating film was cured by irradiating ultraviolet light using a high-pressure mercury lamp in an environment with an oxygen concentration of 500 ppm or less to obtain a hard coat film. The amount of the hard coat layer-forming composition applied was adjusted so that the thickness of the cured film would be 8 μm.

[0032] [Table 1]

[0033] The hard coat films produced in Examples 1 to 14 and Comparative Examples 1 to 9 were each evaluated for transmittance at a wavelength of 380 nm, transmitted image clarity, distribution amount of the ultraviolet absorber in portion X, pencil hardness, adhesion, and antiglare property.

[0034] (transmittance) The transmittance at a wavelength of 380 nm of the hard coat films produced in Examples 1 to 14 and Comparative Examples 1 to 9 was measured using a spectrophotometer (U-4100 manufactured by Hitachi High-Technologies Corporation) under conditions of a C light source and a 2-degree visual field. A transmittance of 10% or less was rated as good, and a transmittance of more than 10% was rated as poor.

[0035] (Transmitted image clarity) For each of the hard coat films produced in Examples 1 to 14 and Comparative Examples 1 to 9, the transmitted image clarity was measured using a 0.5 mm wide optical comb in accordance with JIS K 7105 using a projection measuring instrument (ICM-1T manufactured by Suga Test Instruments Co., Ltd.) A transmitted image clarity of 40% or more and 65% or less was rated as good, and any other value was rated as poor.

[0036] Thereafter, each hard-coated film was subjected to a light resistance test by irradiating it with UV light for 10 hours using a metal halide lamp weather meter (Iwasaki Electric Co., Ltd., Eye Super UV Tester (registered trademark)) under conditions of illuminance of 75 mW, temperature of 63°C, and humidity of 45%RH. The transmitted image clarity was then measured again using the same method as above, and the rate of change in transmitted image clarity before and after the light resistance test was determined. A rate of change within ±20% was rated as good, and any other rate was rated as poor.

[0037] (Total abundance ratio of ultraviolet absorbers in part X) The total abundance ratio of the ultraviolet absorber was calculated by the following procedure.

[0038] <Step 1> A specific example will be described using Example 1. The hard coat film produced in Example 1 was embedded in a photocurable resin and cut with a microtome to prepare a cross-sectional sample.

[0039] Microscopic Raman spectroscopy was performed on the cross-section of the cross-section sample, and the 1230 cm was measured at nine measurement points (depths of 0, 1, . . . , 8 μm) every 1 μm from the surface of the hard coat layer (depth 0%, depth 0 μm) to the back surface (depth 100%, depth 8 μm). -1 Peak intensity I 1230 , and 1720 cm -1 Peak intensity I 1720 The measurement point was set at a part of the cross section where no filler was present. 1230 is an intrinsic value derived from the ultraviolet absorber, and I 1720is an intrinsic value derived from the carbonyl group of the acrylate compound. From this measurement result, the ratio of the amount of ultraviolet absorber in the acrylate compound (I 1230 / I 1720 The ratio of the amount of ultraviolet absorber to the depth (I 1230 / I 1720 ) are shown in the "Measured Values" row of Table 2.

[0040] <Step 2> The measurement results at each measurement point are plotted against the depth of the hard coat layer on the horizontal axis and the UV absorber amount ratio (I 1230 / I 1720 ) on the vertical axis, the graph shown in Figure 3 was obtained. Based on the obtained measurement results, the relationship between the depth and the ultraviolet absorber amount ratio (I 1230 / I 1720 The following approximate formula (1) was obtained, which represents the relationship between the coefficient of determination and the 2 =0.9512. Approximate formula (1) y=-0.0118x+1.3493

[0041] <Step 3> Next, based on the approximate formula (1), the ultraviolet absorber amount ratio (I 1230 / I 1720 ) calculated values ​​A0, A1, . . ., A 100 was calculated. A m is the value of y obtained by substituting the depth m% (m is an integer between 0 and 100) for x in the approximate formula (1). The ratio of the amount of ultraviolet absorber in the acrylate compound (I 1230 / I 1720 ) calculated value A m The calculated value A from the approximate formula in Table 2 m In step 3, the calculated depth values ​​A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, 100 However, for simplicity, Table 2 shows only the calculated depth values ​​corresponding to each measurement point.

[0042] <Step 4> Next, the calculated values ​​A0, A1, . . ., A calculated in step 3 100 The UV absorber amount ratio (I 1230 / I 1720 ) the sum of B0, B1, . . ., B 100 Specifically, the total value B m was calculated based on the following formula (2). (Formula 2) JPEG2025168910000003.jpg3572

[0043] <Step 5> Next, the sums B0, B1, . . ., B calculated in step 4 are 100 The total of B0, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, B11, B12, B13, B14, B15, B16, B17, B18, B19, B20, B21, B22, B23, B24, B25, B26, B27, B28, B29, B30, B31, B32, B33, B34, B35, B36, B37, B38, B40, B41, B42, B43, B44, B45, B46, B47, B48, B49, B50, B51, B52, B53, B54, B55, B56, B57, B58, B59, B60, B61, B62, B63, B64, B65, B6 100 The total abundance ratio of ultraviolet absorbers C0, C1, . . ., C 100 Specifically, the total abundance ratio C of the ultraviolet absorber m was calculated based on the following formula (3). (Formula 3) JPEG2025168910000004.jpg39108

[0044] <Step 6> Next, the total abundance ratios of the UV absorbers C0, C1, . . . , C calculated in step 6 are 100 The values ​​were plotted on a graph with the depth of the hard coat layer on the horizontal axis and the total abundance ratio of the ultraviolet absorber on the vertical axis to obtain the graph shown in FIG.

[0045] For each sample of Examples 2 to 14 and Comparative Examples 1 to 9, the above steps 1 to 5 were carried out to determine the total abundance ratio C of the ultraviolet absorber contained in the portion X from the surface (depth 0%, depth 0 μm) to a depth of 30% of the hard coat layer. 30 was calculated.

[0046] When the total content ratio of the ultraviolet absorber contained in the portion X from the surface (depth 0%, depth 0 μm) to a depth of 30% of the hard coat layer was 40% or more and 50% or less, the result was judged to be good, and when the content was otherwise bad, the result was judged to be bad. In the graph of FIG. 4, when data existed in the shaded area, the result was judged to be good.

[0047] [Table 2]

[0048] (Pencil hardness) A scratch test was performed on the hard coat layer surface using a pencil (Uni, manufactured by Mitsubishi Pencil Co., Ltd.) and a Clemens scratch tester (HA-301, manufactured by Tester Sangyo Co., Ltd.) under conditions of a load of 500 g and a scratching speed of 0.5 mm / sec. The scratch test was performed on five samples, and if two or more samples had scratches on the hard coat layer surface, they were rated as "poor," if fewer than two, they were rated as "good." If the maximum hardness was 3H or more and not "poor," they were rated as "good," and if it was 2H or less, they were rated as "×."

[0049] (adhesion) The hard coat layer was cut into 100 squares, and the adhesion of the hard coat layer to the transparent support was examined in accordance with JIS K 5400. A case in which 10 or fewer squares peeled off (90 or more squares remaining) was evaluated as ◯, and a case in which 11 or more squares peeled off (89 or fewer squares remaining) was evaluated as ×.

[0050] Table 3 shows the evaluation results of the hard coat layer thickness, transmittance at a wavelength of 380 nm, transmitted image clarity (including before and after the light resistance test and the rate of change), total abundance ratio of the ultraviolet absorber in portion X, pencil hardness, adhesion, and antiglare property of the hard coat films produced in Examples 1 to 14 and Comparative Examples 1 to 9.

[0051] [Table 3]

[0052] In all of the hard coat films according to Examples 1 to 14, the amount of UV absorber added was 1.5 to 25 parts by mass relative to 100 parts by mass of the total acrylate compounds. Furthermore, 40% to 50% of the UV absorber present in the hard coat layer was present in the portion X. Therefore, the transmittance at a wavelength of 380 nm was 10% or less, resulting in excellent UV blocking performance, and the surface hardness (pencil hardness) was also excellent. Furthermore, the UV absorber was sufficiently segregated on the surface of the hard coat layer, and the styrene filler did not disintegrate or yellow due to UV rays even after a light resistance test, resulting in excellent transmittance and anti-glare properties. Furthermore, the amount of styrene filler added was 0.1 to 15 parts by mass relative to 100 parts by mass of the total acrylate compounds. As a result, the transmitted image clarity of the hard coat layer was 40% to 65%, achieving both anti-glare and visibility. In Examples 1 to 14, the mass ratio of the high-molecular-weight compound to the low-molecular-weight compound contained in the acrylate compound was 10:90 to 50:50, which allowed for sufficient segregation of the UV absorber on the surface of the hard coat layer. Even after a light resistance test, the styrene filler did not disintegrate or yellow due to UV rays, and the transparency and anti-glare properties were excellent. Furthermore, 0.1 to 15 parts by mass of the photopolymerization initiator was added per 100 parts by mass of the acrylate compound. This allowed the hard coat layer to exhibit excellent surface hardness (pencil hardness), and the adhesion between the hard coat layer and the transparent support was not impaired due to excessive hardness.

[0053] In the hard coat films according to Comparative Examples 1 and 2, the amount of the low molecular weight compound was less than 50 parts by mass, so the UV absorber did not easily segregate on the surface of the hard coat layer, and the styrene filler absorbed UV light, resulting in a change in transmitted image clarity of more than 20% before and after the light resistance test.

[0054] The hard coat films according to Comparative Examples 3 and 4 had high UV transmittance and low UV blocking performance because the UV absorber was less than 1.5 parts by mass. In addition, the styrene filler absorbed UV light, and the rate of change in transmitted image clarity before and after the light resistance test exceeded 20%.

[0055] In the hard coat film of Comparative Example 5, the amount of the ultraviolet absorber exceeded 25 parts by mass, so the pencil hardness of the hard coat layer was low and the surface hardness was poor.

[0056] In the hard coat film of Comparative Example 6, the amount of the photopolymerization initiator was less than 0.1 parts by mass, and therefore the curability of the hard coat layer was reduced, and sufficient surface hardness was not obtained.

[0057] In the hard coat film of Comparative Example 7, the amount of photopolymerization initiator exceeded 15 parts by mass, and therefore the hard coat layer had too strong curing properties, resulting in poor adhesion between the hard coat layer and the transparent support.

[0058] The hard coat film according to Comparative Example 8 did not provide sufficient antiglare properties because the styrene filler content was less than 0.1 parts by mass.

[0059] In the hard coat film of Comparative Example 9, the styrene filler content exceeded 15 parts by mass, and therefore the transmittance of the hard coat layer was poor, resulting in poor image clarity. [Industrial Applicability]

[0060] The hard coat film according to the present invention can be used for optical components such as polarizing plates and display devices. [Explanation of symbols]

[0061] 1. Hard coated film 2 Transparent support 3 Hard coat layer

Claims

1. A hard coat film having a hard coat layer provided on a transparent support, the hard coat layer contains, relative to 100 parts by mass of an acrylate compound, 1.5 to 25 parts by mass of an ultraviolet absorber, 0.1 to 15 parts by mass of a photopolymerization initiator, and 0.1 to 15 parts by mass of a styrene filler; the proportion of the ultraviolet absorber present in a portion of the hard coat layer within 30% of the thickness of the hard coat layer from the surface of the hard coat layer is 40% by mass or more and 50% by mass or less; A hard coat film having a transmittance of 10% or less for light with a wavelength of 380 nm.

2. The acrylate compound is a high molecular weight compound having a weight average molecular weight of 1,000 to 100,000; and a low molecular weight compound having a weight average molecular weight of less than 1000, 2. The hard coat film according to claim 1, wherein the mass ratio of the high molecular weight compound to the low molecular weight compound is 10:90 to 50:

50.

3. 2. The hard coat film according to claim 1, wherein the transparent support is a film made of any one of triacetyl cellulose, polymethyl methacrylate, polyethylene terephthalate, cycloolefin polymer, and polyimide.

4. A polarizing plate using the hard coat film according to any one of claims 1 to 3.

5. An optical member using the polarizing plate according to claim 4.

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