ANTIGLARE FILM LAMINATE, POLARIZING PLATE, AND DISPLAY DEVICE

Abstract

The present invention relates to an antiglare film laminate including a polymer substrate, and an antiglare layer containing a binder resin and organic fine particles or inorganic fine particles dispersed on the binder resin, wherein the number of pressed portions formed on an outer surface of the antiglare layer is 0.001 pieces/m.sup.2 or less, and the pressed portion has a diameter of 200 μm to 600 μm and a thickness of 80% or less of an average thickness of the antiglare layer, a polarizing plate including the antiglare film laminate, and a display device including the polarizing plate.

Claims

1. An antiglare film laminate, comprising: a polymer substrate; and an antiglare layer comprising a binder resin and organic fine particles or inorganic fine particles dispersed on the binder resin, wherein the number of pressed portions formed on an outer surface of the antiglare layer is 0.001 pieces/m.sup.2 or less, and the pressed portion has a diameter of 200 μm to 600 μm and a thickness of 80% or less of an average thickness of the antiglare layer.

2. The antiglare film laminate of claim 1, wherein: the polymer substrate has a thickness of 10 to 150 μm, and the antiglare layer has a thickness of 1 to 10 μm.

3. The antiglare film laminate of claim 1, wherein: a ratio of the thickness of the antiglare layer to the thickness of the polymer substrate is 0.008 to 0.8.

4. The antiglare film laminate of claim 1, wherein: the binder resin included in the antiglare layer comprises a (co)polymer formed from a vinyl-based monomer or oligomer or a (meth)acrylate monomer or oligomer.

5. The antiglare film laminate of claim 1, wherein: a weight ratio of fluorine (F)/carbon (C) element in the pressed portion is 3.0% or less.

6. The antiglare film laminate of claim 1, wherein: a weight ratio of fluorine (F)/carbon (C) element on a surface of the antiglare layer is 10% or more, and a weight ratio of silicon (Si)/carbon (C) element on a surface of the antiglare layer is 5 to 15%.

7. The antiglare film laminate of claim 6, wherein: on the surface of the antiglare layer, a weight ratio of a total of the fluorine (F) and silicon (Si) elements/carbon (C) element is 15 to 40%.

8. The antiglare film laminate of claim 6, wherein: the antiglare layer further comprises a silicon-based additive and a fluorine-based additive.

9. The antiglare film laminate of claim 8, wherein: the antiglare layer comprises 0.3 parts by weight or more of the fluorine-based additive based on 100 parts by weight of the binder resin.

10. The antiglare film laminate of claim 8, wherein: the antiglare layer comprises 0.25 parts by weight or more of the silicon-based additive based on 100 parts by weight of the binder resin.

11. The antiglare film laminate of claim 6, wherein: the silicon-based additive comprises two or more polyether-modified polysiloxane copolymers having different weight average molecular weights.

12. The antiglare film laminate of claim 1, wherein: the antiglare layer comprises 1 to 10 parts by weight of the organic fine particles based on 100 parts by weight of the binder resin.

13. The antiglare film laminate of claim 1, wherein: the antiglare layer comprises 0.1 to 5 parts by weight of the inorganic fine particles based on 100 parts by weight of the binder resin.

14. The antiglare film laminate of claim 1, wherein: the organic fine particles included in the antiglare layer have a cross-sectional diameter of 1 to 50 μm, and the inorganic fine particles included in the antiglare layer have a cross-sectional diameter of 1 nm to 500 nm.

15. The antiglare film laminate of claim 1, wherein: an arithmetic average roughness (Ra) measured on a surface of the antiglare layer is 100 nm or less.

16. A polarizing plate comprising the antiglare film laminate of claim 1.

17. A display device comprising the polarizing plate of claim 16.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0100] FIG. 1 illustrates an electron microscope photograph (100 times) confirming a shape of pressed portions found on a surface of an antiglare film laminate of Comparative Example 1.

[0101] FIG. 2 illustrates a planar analysis result of a pressed portion existing on a surface of an antiglare film laminate of Comparative Example 1 by using the Optical Profiler NewView 7300 equipment.

[0102] FIG. 3 illustrates a cross-sectional analysis result of a pressed portion existing on a surface of an antiglare film laminate of Comparative Example 1 by using the Optical Profiler NewView 7300 equipment.

[0103] The invention will be described in more detail with reference to examples below. However, the following examples are only to illustrate the present invention, the present invention is not limited to the following examples.

Examples 1 to 3 and Comparative Examples 1 to 3: Preparation of Antiglare Film Laminate

[0104] (1) Preparation of Coating Composition for Forming Antiglare Layer

[0105] The components shown in Table 1 below were mixed to prepare a coating composition for forming an antiglare layer.

TABLE-US-00001 TABLE 1 Comparative Comparative Comparative Comparative Unit (g) Example 1 Example 2 Example 1 Example 2 Example 3 Example 4 Binder TMPTA 13.8 13.8 13.8 13.8 13.8 13.8 (total 27.6 g) PETA 6.9 6.9 6.9 6.9 6.9 6.9 EB220 6.9 6.9 6.9 6.9 6.9 6.9 Initiator I-184 1.7 1.7 1.7 1.7 1.7 1.7 Organic fine XX-103BQ 1.3 1.3 1.3 1.3 1.3 1.3 particle Inorganic fine MA-ST 0.2 0.2 0.2 0.2 0.2 0.2 particle Fluorine-based T440 0.015 0.015 0.015 0.015 0.015 — additive T270 0.06 0.06 0.06 0.06 0.06 0.06 Silicon-based F444 0.122 0.195 0.024 0.061 0.061 0.122 additive Solvent IPA — — — — 40 — n-BuOH 10 20 10 10 30 10 MIBK 50 30 50 50 — 50 n-BA 10 20 10 10 — 10 Coating thickness (μm) 4 4 4 4 4 4 Number of pressed 0 0 0.381 0.022 0.010 — portions [pcs/m.sup.2] TMPTA: trimethylolpropane triacrylate PETA: pentaerythritol triacrylate EB220: 6-functional polyurethane acrylate oligomer (manufactured by SK Cytec) I-184: initiator (Irgacure 184, manufactured by Ciba) Organic fine particle: XX-103BQ (2.0 μm 1.515), copolymer particle of polystyrene and polymethylmethacrylate (manufactured by Sekisui Plastic) MA-ST (30% in MeOH): disperse solution in which nano-silica particles with a size 10-15 nm are dispersed in methanol (manufactured by Nissan Chemical) T440: TEGO ® Glide 440 polyether-modified polysiloxane (manufactured by Tego Evonik) T270: TEGO ® Glide 270 polyether-modified polysiloxane (manufactured by Tego Evonik) F444: Megapack F444 (manufactured by DIC Corporation: perfluoroalkylethyleneoxide additive: liquid at room temperature and atmospheric pressure) IPA: isopropyl alcohol n-BuOH: n-butanol MIBK: methylisobutyl ketone n-BA: n-butyl acetate

[0106] (2) Preparation of Antiglare Film Laminate

[0107] Each of the above-prepared coating solutions for forming the antiglare layer was coated onto PET film (manufactured by TOYOBO: thickness 80 μm) by #12 mayer bar, and then dried at a temperature of 40° C. for 2 minutes, followed by UV curing to form an antiglare layer (coating thickness of 4 μm). When UV curing, the UV lamp used a H bulb, the curing reaction was carried out under a nitrogen atmosphere, and the amount of UV light irradiated during curing was 150 mJ/cm.sup.2.

[0108] (3) Confirmation of the Number of Pressed Portions Formed on Outer Surface of Antiglare Layer

[0109] The surface of the antiglare film laminate obtained in each of the examples and the comparative examples was monitored by using an automatic inspection machine (product name: boundary transmission automatic inspection machine/manufacturer: Next Eye) and a charge-coupled device (CCD) camera. In this case, a reflection mode and a transmission mode on the surface of the antiglare film laminate were combined and recorded by dividing it into white dots and black dots, and in the case of pressing, it was marked as the black dot.

[0110] In addition, under a low speed of 5 to 10 m/min, all surfaces were irradiated under three wavelengths and visually inspected, so that an area having a diameter of 200 μm to 600 μm in the antiglare layer and having a thickness of 80% or less of the average thickness of the antiglare layer was designated as the pressed portion.

[0111] In addition, as illustrated in FIG. 2 and FIG. 3, by using the Optical Profiler NewView 7300 equipment, planar and cross-sectional analysis of the pressed portion existing on the surface of the antiglare film laminate was performed.

Experimental Example: Measurement of Physical Properties of Antiglare Film Laminates

[0112] 1. Haze Evaluation of Antiglare Film Laminate

[0113] A 4 cm×4 cm specimen was prepared from the antiglare film laminate obtained from each of the examples and the comparative examples, measurement was performed three times with a haze meter (HM-150, A light source, manufactured by Murakami Color Research Laboratory) and the average value was calculated, and this was calculated as a total haze value. In the measurement, the light transmittance and the haze were simultaneously measured, and the light transmittance was measured according to JIS K 7361 standard and the haze was measured according to JIS K 7136 standard.

[0114] 2. Element Content Analysis in Antiglare Film Laminate

[0115] For the antiglare film laminate obtained from each of the examples and the comparative examples, the contents (the contents measured by obtaining the area of each peak from the narrow scan data of the identified components) of fluorine (F), carbon (C), and silicon (Si) were measured by obtaining a survey and narrow scan spectrum in the constant analyzer energy (CAE) mode by using the XPS device (model name: K-Alpha Thermo Fisher Scientific).

[0116] 3. Measurement of Arithmetic Mean Roughness (Ra) of Antiglare Film Laminate

[0117] For the antiglare film laminate obtained from each of the examples and comparative examples, the arithmetic mean roughness (Ra) was obtained by measuring the surface shape and roughness at 6 or more positions in the 310 μm×230 μm area in the white scanning interferometer (WSI) mode by using Nanosystem's Optical profiler system NV-2700 and repeating these 10 times [measurement reference follows that employed by the NV-2700].

[0118] 4. Measurement of Scratch Resistance

[0119] Using a scratch-resistant measuring device (KPD-301, Kipae E & T), the surface of the optical laminate obtained in each of the examples and the comparative examples was rubbed back and forth 10 times with a steel wool (#0000) under a load at a speed of 27 rpm within a section of 2.5 cm in width and 13 cm in length. The maximum load at which one or less scratch of 1 cm or less observed with the naked eye was observed was measured.

TABLE-US-00002 TABLE 2 Result of experimental example Comparative Comparative Comparative Comparative Example 1 Example 2 Example 1 Example 2 Example 3 Example 4 fluorine (F) and silicon 13 19 6 10 10 — (Si)/all elements [weight ratio, %] fluorine (F)/carbon (C) 16 23 3 10 7 — [weight ratio, %] silicon (Si)/carbon  5 10 6 5 8 — (C) [weight ratio, %] fluorine (F) + silicon 21 33 9 15 16 — (Si)/carbon (C) [weight ratio, %] weight ratio between No press No press 2 — 2.3 — fluorine (F)/carbon (C) elements in pressed portion [weight ratio, %] Arithmetic average 95 62 104 68 54 — roughness (Ra) [nm] Haze (%)  1   1.1 1 1.0 0.8 — Coating property Good Good Good Good Partial Dewetting dewetting occurrence occurrence Scratch resistance 700 gf 700 gf 400 gf 500 gf 400 gf — Number of press  0  0 0.38 0.02 0.01 defects (ea/m.sup.2)

[0120] As shown in the Table 2, it was confirmed that the pressed portion having a diameter of 200 μm to 600 μm and a thickness of 80% or less of the average thickness of the antiglare layer was not substantially formed on the surface of the antiglare film laminate of the examples. In addition, it was confirmed that the antiglare film laminate of these examples realized a level of haze and high image sharpness at which antiglare properties could be realized while having high scratch resistance.

[0121] On the contrary, it was confirmed that, in the antiglare film laminate of the comparative examples, more than 0.01 pieces/m.sup.2 of the pressed portions having a diameter of 200 μm to 600 μm and a thickness of 80% or less of the average thickness of the antiglare layer appeared, and it was confirmed that the antiglare film laminate of these comparative examples exhibited a low level of scratch resistance or relatively low image sharpness.