KR-20260064866-A - COMPOSITION FOR FORMING HARD COATING LAYERS AND ANTI-REFLECTION HIGH HARDNESS FILM USING THE SAME

Abstract

The present invention relates to a composition for forming a hard coating layer and an anti-reflective high-hardness film using the same, comprising: a base film; a first hard coating layer formed on one side of the base film; a second hard coating layer formed on the other side of the base film; and an anti-reflective (AR) coating layer formed on the upper side of the first hard coating layer, wherein each of the first hard coating layer and the second hard coating layer is composed of a composition comprising 1 to 20 parts by weight of a viscosity-regulating monomer and 1 to 5 parts by weight of a photoinitiator mixed with 100 parts by weight of a polyfunctional polyurethane acrylate having at least 2 to 10 oligomer bonds, wherein the first hard coating layer and the second hard coating layer are formed by a simultaneous coating method on both sides of the base film, and the anti-reflective (AR) coating layer comprises one or more of hollow silica magnesium fluoride, boron nitride, silica, and dialuminum trioxide. According to the present invention, by improving the structure to have hard coating layers on both sides of a substrate film, it is possible to secure film flatness and increase pencil hardness, and to provide an anti-reflective high-hardness film that improves adhesion to an object and lowers reflectivity compared to conventional films.

Inventors

• 임현진

Assignees

• 주식회사 스타테크

Dates

Publication Date

20260508

Application Date

20241030

Claims (8)

1. Based on 100 parts by weight of a polyfunctional polyurethane acrylate having at least 2 to 10 urethane bonds, 1 to 20 parts by weight of viscosity-regulating monomer, and A composition for forming a hard coating layer, comprising a mixed composition containing 1 to 5 parts by weight of a photoinitiator.
2. In claim 1, The above composition for forming a hard coating layer is A composition for forming a hard coating layer having a viscosity of 3000 cPs to 6000 cPs.
3. Base film, A first hard coating layer formed on one surface of the above-mentioned substrate film, A second hard coating layer formed on the other side of the above-mentioned substrate film, and It includes an anti-reflective (AR) coating layer formed on the upper surface of the first hard coating layer, and Each of the above first hard coating layer and second hard coating layer is Based on 100 parts by weight of a polyfunctional polyurethane acrylate having at least 2 to 10 oligomer bonds, 1 to 20 parts by weight of viscosity-regulating monomer, and The composition comprises 1 to 5 parts by weight of a photoinitiator, wherein the first hard coating layer and the second hard coating layer are formed on both sides of the substrate film by a simultaneous coating method. The above anti-reflective (AR) coating layer An anti-reflective high-hardness film comprising one or more of hollow silica, magnesium fluoride, boron nitride, silica, and dialuminum trioxide.
4. In claim 3, Each of the above first hard coating layer and second hard coating layer is It is formed through primary UV curing and secondary UV curing, wherein the primary UV curing is formed by irradiation with short-wavelength ultraviolet (UV) light of 300nm to 350nm through a metal UV lamp, and the secondary UV curing is formed by irradiation with long-wavelength ultraviolet (UV) light of 365nm to 385nm through a UV LED lamp. An anti-reflective high-hardness film, wherein the first UV curing and second UV curing each have an irradiation dose of 1,000 mJ/ cm² to 3,000 mJ/ cm² .
5. In claim 3, The above-mentioned substrate film has a thickness of 125 to 250 μm, and Each of the first hard coating layer and the second hard coating layer has a thickness of 10 to 100 μm, and The above anti-reflective high-hardness film is an anti-reflective high-hardness film satisfying a pencil hardness of 4H to 9H.
6. In claim 3, Each of the above first hard coating layer and second hard coating layer has a refractive index of 1.50 to 1.75, and The above anti-reflective (AR) coating layer has a refractive index of 1.2 to 1.4, and The above anti-reflective high-hardness film is an anti-reflective high-hardness film satisfying a reflectance of 2% or less.
7. In claim 3, It further includes an AF coating layer formed on the upper surface of the above anti-reflection (AR) coating layer, and The above AF coating layer An anti-reflective high-hardness film in which either or both of fluorinated acrylic compounds and fluorine-containing polymers are used to increase the water contact angle and increase wear resistance.
8. In claim 3, It further includes an adhesive layer formed on the lower surface of the second hard coating layer, The above adhesive layer is made of a silicone material for adhesion to the object, and The above adhesive layer is an anti-reflective high-hardness film formed with a thickness of 30 to 50 μm.

Description

Composition for Forming Hard Coating Layers and Anti-Reflection High Hardness Film Using the Same The present invention relates to a composition for forming a hard coating layer and an anti-reflective high-hardness film using the same. More specifically, the invention relates to a composition for forming a hard coating layer capable of increasing pencil hardness while ensuring film flatness, improving adhesion to an object, and including an anti-reflective function, and an anti-reflective high-hardness film using the same. With the rapid development of the display industry within the IT sector recently, the importance of surface protection films used to safeguard display surfaces is increasing, and there is a growing demand for films with high pencil hardness, which are types capable of enhancing surface hardness compared to existing ones. Accordingly, in manufacturing surface protection films used to protect display screens of portable mobile devices and display devices, we are focusing on producing high-hardness films to meet the increasing demand for films with high pencil hardness. In addition, we are striving to ensure the flatness of the films. Furthermore, regarding surface protection films for displays, while film flatness can be ensured in normal environments, it becomes difficult to maintain flatness when environmental changes occur. Consequently, the film lifts upward from the object, and improvements are required to address this issue. For example, during the charging of a portable mobile device, the inner side of the film's hard coating layer expands due to degradation caused by high-speed charging, whereas the outer side contracts due to contact with air. This results in the film attached to the mobile device lifting upward. This is causing problems that lower not only the marketability but also the reliability of display film products. Meanwhile, for portable mobile devices and the like, technologies aimed at improving usage time are being developed by classifying them into high-capacity battery technology and power consumption minimization technology. Among these, power consumption minimization technology is concentrated on displays, which account for the largest share of power consumption in devices. Technological development in this area is divided into two fields: improving light sources for LCDs, LEDs, and OLEDs, and improving operating mechanisms. However, recently, as the focus has shifted to technology fields that improve visibility with minimal brightness, improvements are concentrating on low-reflection technology, with a focus being placed on reflectivity, which has the greatest impact on visibility. FIG. 1 is a cross-sectional structure illustrating an anti-reflective high-hardness film according to one embodiment of the present invention. FIG. 2 is an exemplary diagram showing the formation structure according to the thickness of the substrate film and the hard coating layer in an anti-reflective high-hardness film according to one embodiment of the present invention. FIG. 3 is an example diagram showing a test of the lifting phenomenon during rapid charging of an anti-reflective high-hardness film according to one embodiment of the present invention and a film according to the prior art. FIG. 4 is an exemplary diagram showing a reflectance test of an anti-reflective high-hardness film according to one embodiment of the present invention and a film according to the prior art. Preferred embodiments of the present invention are described as follows, and through such detailed description and various examples, the purpose, structure, and features of the present invention will be better understood. FIG. 1 is a cross-sectional structure illustrating an anti-reflective high-hardness film according to one embodiment of the present invention. Referring to FIG. 1, an anti-reflective high-hardness film according to one embodiment of the present invention may be configured to include a base film (10), a first hard coating layer (20), a second hard coating layer (30), an anti-reflective (AR) coating layer (40), an AF coating layer (50), and an adhesive layer (60). The above-mentioned base film (10) may be a polyethylene terephthalate (PET) film. The above-mentioned substrate film (10) may have a thickness of 125 to 250 μm. The first hard coating layer (20) above may be formed from a composition for forming a hard coating layer. It may be formed by a curing method by ultraviolet (UV) irradiation. The composition for forming a hard coating layer for the first hard coating layer (20) may be composed of a mixed composition comprising 1 to 20 parts by weight of a viscosity-regulating monomer and 1 to 5 parts by weight of a photoinitiator, based on 100 parts by weight of a polyfunctional polyurethane acrylate having at least 2 to 10 oligomer bonds. The polyfunctional polyurethane acrylate having at least 2 to 10 oligomer bonds can be used as a main raw material for forming a stable hard coating lay