Optical films with controlled surface morphology and the method of manufacturing the same

An optical film and manufacturing method technology, applied in optics, optical components, optical components, etc., can solve the problems of large coating speed, maximum limit, air merging, etc., to achieve the effect of improving productivity

Inactive Publication Date: 2012-07-11
SK INNOVATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In general, as the viscosity of the coating solution increases and the interfacial tension of the coating solution decreases, the incorporation of air tends to occur, thereby limiting the maximum coating speed (Journal of the American Institute of Chemical Engineers, Vol. 33, p. 141, 1987)

Method used

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  • Optical films with controlled surface morphology and the method of manufacturing the same
  • Optical films with controlled surface morphology and the method of manufacturing the same
  • Optical films with controlled surface morphology and the method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of cellulose acylate solution

[0052] The composition described below was introduced into the mixer and dissolved therein at a temperature of 30°C:

[0053] Cellulose acetate 19wt%

[0054] Dichloromethane 73wt%

[0055] Methanol 6.0wt%

[0056] Triphenyl Phosphate 1.05wt%

[0057] Biphenyl diphenyl phosphate 0.5wt%

[0058] UV absorber 1 (benzotriazole cresol 328, Ciba (Ciba) company) 0.2wt%

[0059] UV absorber 2 (benzotriazole cresol 327, Ciba) 0.2wt%

[0060] SiO 2 0.05wt%

[0061] Cellulose acetate having a weight average molecular weight of 250,000 and a degree of substitution of 2.8 was used. The SiO used here 2 Has an average elementary particle diameter of about 20 nm. The resulting solution was conveyed by a gear pump, heated to 30° C., filtered through a filter paper with an absolute filtration accuracy of 0.01 mm, and then further filtered through a cartridge filter with an absolute filtration accuracy of 5 μm.

[0062] Production...

Embodiment 2

[0066] The film obtained from Example 1 was used to provide a film with a scratch resistant clear coating. A photocurable acrylic coating solution was coated on the Example 1 film. The coating solution had a binder solids content of 43 wt%, and included 42.2 wt% methyl ethyl ketone and 14.8 wt% isopropanol as solvents. The coating solution was coated using a No. 5 Mayer bar, dried in an oven at 100° C. for 30 seconds, and passed through a 57 mJ / cm 2 · s intensity of UV light for 10 seconds at 25°C. The dried and cured film exhibited a transparent appearance with a coating of about 5 μm thickness and 3H pencil hardness. The film has the physical properties listed in Table 1.

Embodiment 3

[0068] The same coating solution as in the Mayer rod coating experiment of Example 2 was used, and a cellulose acetate film with controlled surface morphology was used in a multiple coater to determine the coating speed at which bubble coalescence occurred. A slot die was used as a coating die and the drying temperature was individually controlled in three zones of 60°C, 100°C, and 110°C. To ensure the stability of the coating beads, vacuum suction was used. The film has the physical properties listed in Table 2.

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Abstract

Provided are an optical film for use in flat panel display (FPD) devices, and a method for manufacturing the same. Particularly, there is provided a method for imparting surface roughness to an optical film, which includes forming dented craters having a radius of curvature of 10 nm-100 [mu]m on the surface of an optical film obtained by a solution casting process and forming a plateau between one crater and another crater. There is also provided an optical film obtained by the same method.

Description

technical field [0001] The present invention relates to a method for producing an optical film having a controlled surface roughness, and an optical film having a controlled surface morphology obtained therefrom, the method comprising using moisture-containing air to dry an optical film formed by solution casting The film surface to form a surface morphology with craters and plateaus. Background technique [0002] A flat panel display device such as a liquid crystal display device or an organic light emitting diode (OLED) uses a polarizing plate. To manufacture polarizing plates, polyvinyl alcohol (PVA) films are used in combination with optical protection films. As for an optical film on a surface for protecting and supporting a polarizing plate and for direct observation by a user, an antiglare coating, a low reflection coating, an antireflection coating, etc. are applied to provide an antiglare effect. Scratch-resistant clear coatings (hard clear coating) are also used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D11/00
CPCG02B1/04B29C67/202B29D11/0074Y10T428/24364Y10T428/24355C09K2323/031C09K2323/03B29D11/00
Inventor 赵容均李喆浩黄裕锡金奕钱金琦烨孙晟豪金起范丁光镇崔俊泰
Owner SK INNOVATION CO LTD
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