WO2017164580A2 - Liquid crystal protective film - Google Patents

Abstract

The present invention relates to a liquid crystal protective film which is attached to the surface of a liquid crystal of smart devices, such as mobile phones, to protect the liquid crystal and has antibacterial, aromatic and deodorizing functions to enable comfortable use of such devices. Provided is a liquid crystal protective film comprising: a base film; a coating layer, formed on the base film, comprising 0.01 to 5% by weight of titanium dioxide (TiO₂) powder of 5 to 15 nm, 0.001 to 3% by weight of elvan powder of 0.1 to 4 μm and 0.01 to 2% by weight of microcapsules carrying fragrance components; and an adhesive layer formed on the bottom surface of the base film.

Description

LCD protective film

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal protective film attached to a liquid crystal surface of a smart device such as a cellular phone. It relates to a liquid crystal protective film that enables the.

A liquid crystal display (LCD) is a device that displays a screen by inserting a liquid crystal between two thin glass substrates. In the case of a product having a liquid crystal, such as a mobile phone, in order to protect the liquid crystal, a liquid crystal protective film is usually attached to the surface of the product. In particular, in the case of a smartphone or a touch screen, it is necessary to touch the screen directly with a finger, and the number of touches is frequent, so it is important to keep the surface clean. Particularly in the case of a mobile phone, when a user uses a mobile device, cosmetics, sweat, etc. of the face are buried on the surface of the mobile phone, and when bacteria grow on these pollutants, they cause odors.

Accordingly, a liquid crystal protective film having an antibacterial and deodorant function has been developed. Republic of Korea Patent No. 1465964 "Antibacterial liquid crystal protective film and its manufacturing method" includes a polymer resin and a photosensitizer, the polymer resin is at least one selected from silicone, latex, polyurethane, polyethylene terephthalate, light The sensitizer is a photosensitive agent A having a light absorption peak at the center wavelength band (430 to 495 nm) of the blue region, a photosensitive agent B having a light absorption peak at the center wavelength band (505 to 570 nm) of the green region, and a red region. At least two selected from the photosensitizer C having a light absorption peak at the wavelength band (610 to 720 nm) of, the photosensitizer A is hypocrellin B (Hypocrellin B), Acridine orange ), At least one selected from coumarin (Coumarin), the photosensitive agent B is at least one selected from Rose Bengal (Rose Bengal), Rhodamine B (Rhodamine B), merocyanine 540 (Merocyanine 540), Photosensitive C is methylene (Methylene blue), peoh formate carbide A (Pheophorbide A), at least one element selected from Cryptococcus when not (Cryptocyanine), the concentration of the photosensitive agent is 1 × 10 ^-8 to 30 × 10 with respect to the polymer resin, 1 g ^{- 7} mol, maintains the shape and properties of the film at a temperature of 10 to 140 ℃, maintains the shape and properties of the film in the pH range of 4 to 9, inhibits the formation of biofilm or decomposes the formed biofilm The antimicrobial liquid crystal protective film having a characteristic, characterized in that the sterilization efficiency for Staphylococcus aureus (Staphylococcus aureus, ATCC 25923) is 75% or more.

In addition, the Republic of Korea Patent No. 1433574 "mobile communication terminal electromagnetic shielding protective film and mobile communication terminal integrated electromagnetic shielding protective film" includes a shock absorbing layer 111 made of at least one material of silicon, acrylic; An anti-wear layer 112 laminated on the impact absorbing layer 111 and made of at least one of polyethylene terephthalate (PET), tempered polyurethane (TPU), and polyurethane (PU); The front of the mobile communication terminal (S) is divided into a speaker area 102 with speaker means, a display area 106 with display means, and a microphone area 108 with microphone means, wherein the speaker area 102 and the An electromagnetic wave shielding layer 113 stacked on the wear protection layer 112 at a position corresponding to the microphone region 108; An ultraviolet coating layer 118 stacked on the wear protection layer 112 at a position corresponding to the display area 106; A main film layer 119 stacked on the electromagnetic wave blocking layer 113 and the ultraviolet coating layer 118 and made of at least one material of polycarbonate (PC) and photo chromic micro image (PCMI); And laminated on the main film layer 119, and a functional coating layer 120 for antibacterial and anti-fingerprint; including, the electromagnetic wave blocking layer 113, on the wear protection layer 112, nickel, copper, silver By applying an electromagnetic wave shield comprising at least one of elvan

A barrier coating layer 114 formed; A deposition layer 115 formed by depositing the barrier coating layer 114; A print layer 116 printing at least one of a color and a pattern set on the deposition layer 115; And a UV forming layer 117 for forming a UV (ultraviolet) curable pattern on the printed layer 116. The electromagnetic wave blocking liquid crystal protective film for a mobile communication terminal is disclosed.

However, there has been a demand for a protective film that is more effective and lasts longer than antibacterial, antifouling and deodorizing functions. The present inventors introduced a photocatalyst to the coating layer of the base film in order to provide antimicrobial and deodorizing functionality in addition to the liquid crystal protection function, and completed the present invention by encapsulating and applying the aromatic component to use a smart device in a more comfortable environment.

An object of the present invention is to provide a liquid crystal protective film excellent in antibacterial, antifouling, deodorant and aromatic.

In addition, another object of the present invention is to provide a liquid crystal protective film that allows the fragrance to be emitted during the liquid crystal touch of a smart device such as a mobile phone.

According to the present invention in order to achieve the above object; Titanium dioxide (TiO ₂ ) powder of 5 ~ 15nm 0.01 ~ 5% by weight, 0.1 ~ 4㎛ ganbanite powder of 0.001 ~ 3% by weight and the fragrance component supporting microcapsules 0.01 ~ 2% by weight formed on the base film Coating layer; And a pressure-sensitive adhesive layer formed on the lower surface of the base film.

The base film is preferably made of polyethylene terephthalate (PET), polycarbonate (PC) or stretched polypropylene (OPP). The titanium dioxide (TiO ₂ ) powder preferably has an anatase crystal structure and occupies a volume of 80% or more, and more preferably, the ratio of the anatase type and the rutile type (Rutile) is 9: 1. It is mixed with.

The fragrance ingredients are apple flavor, grape flavor, pineapple flavor, strawberry flavor, orange flavor, lemon flavor, rose flavor, lily flavor, pine needle flavor, geranium flavor, cypress flavor, lavender flavor, mint flavor, jasmine flavor, rosemary flavor, rosewood flavor, At least one selected from the group consisting of eucalyptus flavor, lemongrass flavor, tea tree flavor, vanilla flavor and hazelnut flavor can be used. Preferably, the aromatic component-carrying microcapsules are pressure-sensitive microcapsules having a burst strength of 0.2 to 1.5 Kg / cm 2.

The upper coating layer of the liquid crystal protective film according to the present invention contains a photocatalyst titanium dioxide and deodorant mbanstone powder, excellent antibacterial, antifouling, deodorizing activity, contains a microcapsule containing an aromatic component, the fragrance is continuously slowly When the fragrance component is loaded onto the pressure-sensitive microcapsules, the fragrance is emitted when touched with a predetermined pressure or more, so that a smart device such as a mobile phone can be used in a more comfortable environment.

Hereinafter, the present invention will be described in more detail. The present invention provides a continuous antimicrobial and antifouling properties by using a photocatalyst, an inorganic antimicrobial agent, the fragrance lasts longer, especially the pressure-sensitive microcapsules so that the fragrance can be emitted during the touch of the liquid crystal of smart devices such as mobile phones It is characterized by using.

Photocatalyst refers to a catalyst that reacts to light and affects the reaction rate in a specific reaction. The basic reaction principle is as follows. If this squat light to the material to be mainly used as a photocatalyst, the surface electron (e ^-) and the positive hole (h ⁺⁾ is causing, the former reacts with the oxygen in the surface of the photocatalyst makes the superoxide anion (O ^2-) . Holes also react with water present in the air to form hydroxyl radicals (neutral OH). Hydroxyl radicals produced at this time have a very good ability to oxidatively decompose organic substances, and thus decompose odors, viruses, bacteria, etc., which are always present in the air, and convert them into water and carbon dioxide.

Photocatalyst technology ranges from environmental fields, such as the treatment of hard-degradable pollutants in water and air, to materials using antimicrobial and superhydrophilic functions, and artificial photosynthesis research such as hydrolysis using hydrogen and carbon dioxide conversion. The field of application is very wide. Photocatalytic reactions are based on electron transfer reactions at the interface that occur after electrons and holes (particles that behave like positively charged electrons) in response to the intervening energy absorption of the semiconductor. The generated holes and electrons cause oxidation and reduction reactions, respectively, and can be applied to various fields through the oxidation and reduction reactions. In the field of environmental purification, the primary use of the strong oxidizing power of OH radicals (OH ·) produced by the reaction of holes with water present in water or air. By utilizing the oxidative decomposition reaction of various hardly decomposable organic substances by OH radicals, advanced processing process is possible, and not only the removal of aqueous hardly decomposable organic pollutants but also the decomposition of VOCs and odorous substances in the air, and also the virus It is known to remove bacteria such as bacteria. On the other hand, for energy applications such as water-decomposition hydrogen production and conversion of carbon dioxide, it is based on reduction reactions using electrons in conduction bands. As such, the types of photocatalysts that can be utilized in various applications are also very diverse, and titanium dioxide (TiO ₂ ) is a representative high efficiency commercial photocatalyst. Since the activity varies depending on the crystal structure and particle size of titanium dioxide, research on this should be carried out for use depending on the purpose.

On the other hand, the production and evaluation of new photocatalysts with high photoactivity in desired applications is steadily progressing, and research on the development of photocatalysts with visible light activity, which occupies the largest area of sunlight, is being actively conducted.

In the present invention, nano-sized titanium dioxide (TiO ₂ ) powder is used as the photocatalyst. It is preferable to use titanium dioxide (TiO ₂ ) powder having an average particle diameter of 5 to 15 nm. In addition, the crystal structure of the anatase type is preferably used to occupy a volume of 80% or more, in particular nano-titanium dioxide powder in which the anatase type and rutile (Rutile type) is mixed in a 9: 1 ratio is used. When the antibacterial activity and antifouling property was more excellent.

In addition, in the present invention, in order to improve the deodorizing effect and the effects of electromagnetic wave blocking, etc., it is used together with the elvan powder in the coating layer. Elvanite is calcined at high temperature and then processed into a powder of 0.1 to 4 µm and added. Since elvan powder has a porous structure, it adsorbs malodorous components and shows a deodorizing effect.

In the present invention, in order to impart aromaticity to the LCD protective film, the coating layer of the LCD protective film of the present invention includes a microcapsule supporting an aromatic component. Aroma components include apple, grape, pineapple, strawberry, orange, lemon, rose, lily, pine needle, geranium, cypress, lavender, peppermint, jasmine, rosemary, rosewood, eucalyptus Aroma components selected from the group consisting of flavors, lemongrass flavors, tea tree flavors, vanilla flavors and hazelnut flavors can be used. When the fragrance component is used as it is, the persistence of the fragrance is inferior, and it is preferable that the fragrance component be gradually released to the microcapsules to release the fragrance.

More preferably, in order to exhibit a directional effect by pressing at the touch, it is preferable to be supported on the pressure-sensitive microcapsules and to be divergent when a constant pressure is applied.

According to one embodiment of the present invention, the aromatic component-bearing pressure-sensitive microcapsules have a burst strength of about 0.2 to 1.5 Kg / cm 2, preferably 0.7 to 1.0 Kg / cm 2. If the burst strength is out of the fragrance is too easily divergent, or may cause a problem that the fragrance does not diverge when touched. Whenever you touch the phone with a certain pressure, the supported fragrance is emitted, so the effect lasts for a long time, creating a comfortable environment.

Pressure-sensitive microcapsules containing the fragrance of the present invention consists of a core-shell structure having a fragrance component as a core. The size of the microcapsules of the present invention is preferably 2 to 200 μm, more preferably 2 to 100 μm, in consideration of ease of manufacture, ease of use, and the like.

According to one embodiment of the present invention, the pressure-sensitive microcapsules containing such fragrance components may be prepared by a coacervation method. For example, after the fragrance components and anionic polymer aqueous solution are mixed at 40 to 80 ° C. to prepare a mixed solution, the mixture is stirred to form an emulsion droplet. The emulsion droplet-containing mixed solution is added to the cationic polymer aqueous solution, and the pH of the aqueous solution is adjusted to about 4 to 4.5. The mixture can be prepared by cooling to 15 to 18 ° C. and adding a crosslinking agent.

The anionic polymer solution may include at least one anionic polymer selected from the group consisting of arabic gum, carboxy methyl cellulose, sodium alginate, lecithin, and polyacrylic acid. An aqueous solution may be used. As the cationic polymer, any one or more polymers selected from the group consisting of gelatin (gelatine), albumin (albumin) and soybean protein may be used. As the crosslinking agent, glutaraldehyde may be used. According to one embodiment of the present invention, the microcapsules carrying fragrance components prepared as described above may be dispersed in a coating liquid composition to form a coating layer by coating or spraying on a base film.

The nano-titanium dioxide powder, elvan stone powder and the microcapsules carrying fragrance components are mixed with a binder to prepare a coating solution composition. At this time, according to one embodiment of the present invention 0.01 to 5% by weight of 5 ~ 15nm titanium dioxide (TiO ₂ ) powder, 0.001 ~ 3% by weight of ganbanite powder of 0.1 ~ 4㎛ and aroma component supporting microcapsules 0.01 ~ The coating solution composition was prepared to contain 2% by weight. If it is out of the above range, the transparency of the liquid crystal protective film is impaired, or the effect thereof is weak so that the antibacterial, antifouling, deodorant and aroma effects are not sufficiently exhibited.

The binder resin may be an oligomer by any one or more UV curing method selected from the group consisting of Aliphatic Urethane Acrylate-based, Aromatic Urethane Acrylate-based, Epoxy Acrylate-based, Epoxy Methacrylate-based and Polyester Acrylate-based resin. Alternatively, any one of the thermosetting binder resins selected from the group consisting of epoxy, urethane, polyester, acrylic and alkid resins may be used.

The coating liquid composition is sprayed or applied onto the base film by a conventional method to form a coating layer. The base film is preferably made of polyethylene terephthalate (PET), polycarbonate (PC) or stretched polypropylene (OPP).

The lower surface of the base film to form an adhesive layer for attaching to the liquid crystal of a smart device such as a mobile phone. Any one of silicone, acrylic, or urethane resin can be used for the adhesive layer. The adhesive layer may be attached to the release film for ease of use, such as storage and transport.

The liquid crystal protective film according to the present invention prepared as described above was attached to the liquid crystal of the mobile phone to be used normally, and evaluated by the sensory test result showed excellent results.

This is because the photocatalyst titanium dioxide and deodorant lamellar powder contained in the upper coating layer on the substrate surface effectively decompose organic materials attached when using a mobile phone, thereby preventing the growth of bacteria and inhibiting odor generation, and decontaminating pollution so that it can be easily removed. I think it is because. In addition, the fragrance lasted for a long time because the fragrance is supported in microcapsules. In particular, when the aroma component is used by supporting the pressure-sensitive microcapsules, the aroma component is emitted when the mobile phone touches the liquid crystal was able to use the mobile phone in a more comfortable environment.

EXAMPLE

Hereinafter, the present invention will be described in more detail.

Example 1: Preparation of LCD Protective Film

5 wt% of 15 nm titanium dioxide (TiO ₂ ) powder, 3 wt% of 4 μm ganthrite powder, and 2 wt% of apple flavored microcapsules having a burst strength of 1.0 Kg / cm 2 were added to the binder resin. An activator and an antifoam were added to prepare a coating liquid composition. The coating solution composition was applied to a polyester (PET) film to a thickness of 20㎛. After coating, heat treatment was performed at 180 ° C. in a hot air dryer for 10 seconds to prepare a liquid crystal protective film.

Example 2: Preparation of LCD Protective Film

3 wt% of 10 nm titanium dioxide (TiO ₂ ) powder, 1 wt% of 4 μm ganthrite powder, and 1 wt% of apple flavored microcapsules having a burst strength of 1.0 Kg / cm 2 were added to the binder resin. An activator and an antifoam were added to prepare a coating liquid composition. The coating solution composition was applied to a polyester (PET) film to a thickness of 20㎛. After coating, heat treatment was performed at 180 ° C. in a hot air dryer for 10 seconds to prepare a liquid crystal protective film.

Comparative Example 1: Preparation of LCD Protective Film

The coating liquid composition was prepared by adding 3 wt% of 4 micron ganbanite powder and 2 wt% of apple flavored microcapsules having a burst strength of 1.0 Kg / cm 2 to the binder resin, and adding a curing agent, a dispersant, a surfactant, and an antifoaming agent. The coating solution composition was applied to a polyester (PET) film to a thickness of 20㎛. After coating, heat treatment was performed at 180 ° C. in a hot air dryer for 10 seconds to prepare a liquid crystal protective film.

Comparative Example 2: Preparation of LCD Protective Film

The binder resin was added to 3 wt% of 4 μm of elvan powder, and a curing agent, a dispersant, a surfactant, and an antifoaming agent were added to prepare a coating liquid composition. The coating solution composition was applied to a polyester (PET) film to a thickness of 20㎛. After coating, heat treatment was performed at 180 ° C. in a hot air dryer for 10 seconds to prepare a liquid crystal protective film.

Test Example: Sensory Evaluation

Each of the ten users was attached to the liquid crystal protective film prepared in the above Examples and Comparative Examples to the liquid crystal of the mobile phone, and then allowed to use for three days and then subjected to sensory evaluation. The evaluation items were antifouling, deodorant and odor, and evaluated according to the 5-point scale (1 point: bad ~ 5 points: good). The results are shown in Table 1 below.

Item	Example 1	Example 2	Comparative Example 1	Comparative Example 2
Antifouling	4.2	4.0	2.5	4.0
Deodorant	4.5	4.3	4.0	2.0
directional	4.5	4.3	3.0	1.0

As confirmed in Table 1, it can be seen that the liquid crystal protective film of the embodiment of the present invention is excellent in antifouling property, deodorizing property and aromaticity according to the antibacterial property.

Claims (5)

1. Base film; Titanium dioxide (TiO ₂ ) powder of 5 ~ 15nm 0.01 ~ 5% by weight, 0.1 ~ 4㎛ ganbanite powder of 0.001 ~ 3% by weight and the fragrance component supporting microcapsules 0.01 ~ 2% by weight formed on the base film Coating layer; And a pressure-sensitive adhesive layer formed on the lower surface of the base film.
2. The liquid crystal protective film according to claim 1, wherein the base film is made of polyethylene terephthalate (PET), polycarbonate (PC) or oriented polypropylene (OPP).
3. The liquid crystal protective film according to claim 1, wherein the titanium dioxide (TiO ₂ ) powder has an anatase crystal structure and occupies a volume of 80% or more.
4. According to claim 1, wherein the aroma component is apple flavor, grape flavor, pineapple flavor, strawberry flavor, orange flavor, lemon flavor, rose flavor, lily flavor, pine needle flavor, geranium flavor, cypress flavor, lavender, flavor, peppermint flavor, jasmine flavor, rosemary Liquid crystal protective film, characterized in that at least one selected from the group consisting of flavor, rosewood flavor, eucalyptus flavor, lemongrass flavor, tea tree flavor, vanilla flavor and hazelnut flavor.
5. The liquid crystal protective film of claim 1, wherein the aromatic component-carrying microcapsules are pressure-sensitive microcapsules having a burst strength of 0.2 to 1.5 Kg / cm 2.