KR102106883B1 - Paint composition for preparing beam projector screen and beam projector screen - Google Patents

Abstract

The present invention relates to a coating composition for forming a beam projector screen and a screen for a beam projector manufactured using the same. The coating composition for a beam projector screen of the present invention can be easily and instantly installed on a beam projector screen by simply applying and drying on a substrate having various types and shapes, and accordingly, various presentation members Or, it can be applied to many fields, such as outdoor billboards.

Description

Coating composition for beam projector screen formation and screen for beam projector {PAINT COMPOSITION FOR PREPARING BEAM PROJECTOR SCREEN AND BEAM PROJECTOR SCREEN}

The present invention relates to a coating composition for forming a beam projector screen and a screen for a beam projector manufactured using the same.

In classrooms, offices, academies, and homes, presentations are given for various purposes, such as education, conferences, and so on.

At this time, in order to help listeners understand and increase concentration, various types of presentation members are used.

In the past, presentations were often conducted with charts, such as charts with various charts or summarized summaries written directly on the paper, or presentations were made while writing directly on a blackboard. Recently, due to the development of digital media and devices, , In many cases, presentations are made with computer images in the form of spreadsheets or computer files in the form of documents, and implemented as images.

At this time, as a device for realizing images, large LCD displays and the like have been widely used, and these image realizing devices are widely used for various purposes such as outdoor billboards as well as presentations.

However, such display devices such as LCDs and LEDs are very expensive and have many restrictions on mobility. Particularly, as the size of the screen to be used by the user increases, the price and mobility limitations increase dramatically, so In general, a method of using a beam projector and a screen for projecting it is often used.

As the screen for the beam projector, the white cloth type screen, which has been used in theaters for a long time, is the most common. The method using a beam projector and a cloth screen is very inexpensive in terms of cost compared to using the above LCD or LED display device, and a simple screen or the like can be used, so mobility is also excellent.

However, such a cloth screen, in order to secure a certain illuminance when projecting a beam projector, requires constant management even when not in use. When not in use, it is not easy to care for storage and management, and even if a mobile screen is used, it can be installed. There is a problem in that the location is limited, and it is difficult to use it, especially for outdoor billboards.

The present invention aims to provide a coating composition for a beam projector screen and a screen for a beam projector manufactured by using the coating composition for a beam projector screen, which can be installed on the spot desired by a user by an easy and quick application and drying process. do.

The present invention,

A) hydrophilic binders;

B) fine particles of metal oxide fine particles having an average particle diameter (D50) of 0.03 to 0.1 µm;

C) hollow silica particles; And

D) solvents;

C) The hollow silica particles,

c1) first hollow silica particles having an average particle diameter (D50) of 25 to 35 μm; And

c2) comprising second hollow silica particles having an average particle diameter (D50) of 1 to 15 μm,

Provided is a coating composition for forming a beam projector screen.

At this time, the hydrophilic binder, a silicone-acrylate-based binder, a silica sol-based binder, a vinyl acetate-based binder, a polyvinyl alcohol-based binder, a urethane-based binder, and one or more selected from the group consisting of a silicone-based organic-inorganic hybrid binder It may be included.

And, the metal oxide fine particles, for example, titanium (Ti), molybdenum (Mo), tantalum (Ta), tungsten (W), vanadium (V), aluminum (Al), zinc (Zn), indium (In ), Tin (Sn), and antimony (Sb).

According to one embodiment of the invention, the metal oxide fine particles may be preferably included in about 30 to about 60 parts by weight based on 100 parts by weight of the hydrophilic binder.

In addition, the hollow silica fine particles may be preferably included in about 50 to about 75 parts by weight based on 100 parts by weight of the hydrophilic binder.

At this time, among the hollow silica fine particles, the above-mentioned c1) first hollow silica particles and c2) second hollow silica particles are included in a weight ratio of about 5: 5 to about 1: 9, and particles with a relatively small particle size It may be preferable that particles having a relatively large particle size are included in the same amount, or particles having a relatively small particle size are further included.

In addition, the present invention,

Transparent substrates; And

A semi-transparent layer formed by the above-described composition on at least one surface of the substrate;

A screen for a beam projector is provided.

The translucent layer has an adhesive strength to a substrate of 4B or more, measured according to ASTM D 3359,

After contacting the semi-transparent layer with a hydrophilic solvent, the adhesive strength to the substrate, measured according to ASTM D 3359, may be 0B or less.

In addition, it is preferable that the semi-transparent layer and the hollow silica particles contained in the form dispersed in the hydrophilic binder component of the semi-transparent layer satisfy Expression 1 below.

[Equation 1]

In the above formula,

d ₁ is an average particle diameter (D50) of the first hollow silica particles,

T is the dry thickness of the translucent layer,

d ₂ is the average particle diameter (D50) of the second hollow silica particles.

In this case, it is preferable that the semi-transparent layer and the first hollow silica particles protruding to the top of the semi-transparent layer satisfy the following Equation 2.

[Equation 2]

In the above formula, A1 is the largest cross-sectional area of the first hollow silica particles, and A2 is the cross-sectional area of the first hollow silica particles exposed on the translucent layer.

Due to the above characteristics, according to an embodiment of the present invention, the beam projector screen may have a haze value of about 90 to about 97 according to JIS K 7136 standard.

According to another embodiment of the present invention, the beam projector screen may have a total light transmittance value of about 85 to about 90% according to JIS K 7361.

In addition, the beam projector screen may have a diffusion transmittance value of about 80 to about 85 and a parallel transmittance value of about 1 to about 5 according to JIS K 7361.

The coating composition for a beam projector screen of the present invention can be easily and instantly installed a beam projector screen through a process of simply applying and drying on a substrate having various types and shapes, and also, the occurrence of bright spots. Effectively reduced, it is possible to realize excellent optical properties, such as improving visibility, it is possible to apply to various fields, such as various presentation members, outdoor billboards.

1 is a cross-sectional view of a beam projector screen according to an embodiment of the present invention.
2 is an image obtained by observing a surface through an optical microscope for a beam projector screen according to Examples and Comparative Examples of the present invention.
3 is a photograph observed from the front when the test screen of the beam projector is projected from the rear side of the beam projector screen according to the embodiment and the comparative example of the present invention.

The coating composition for forming a beam projector screen of the present invention,

A) hydrophilic binders;

B) fine particles of metal oxide fine particles having an average particle diameter (D50) of 0.03 to 0.1 µm;

C) hollow silica particles; And

D) solvents;

C) The hollow silica particles,

c1) first hollow silica particles having an average particle diameter (D50) of 25 to 35 μm; And

c2) The second hollow silica particles having an average particle diameter (D50) of 1 to 15 μm are included.

In addition, the present invention, the beam projector screen,

Transparent substrates; And

A translucent layer formed by the above-described composition on at least one surface of the substrate.

The terminology used herein is only used to describe exemplary embodiments, and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "include", "have" or "have" are intended to indicate the presence of implemented features, numbers, steps, elements or combinations thereof, one or more other features or It should be understood that the existence or addition possibilities of numbers, steps, elements, or combinations thereof are not excluded in advance.

Also in the present invention, when each layer or element is referred to as being formed “on” or “above” each layer or element, it means that each layer or element is formed directly on top of each layer or element, or other It means that a layer or element can be additionally formed between each layer, on an object or substrate.

The screen for the beam projector of the present specification may be a rear-illumination screen, preferably, with respect to the screen, in a direction opposite to the viewer, to which the beam projector light source is irradiated.

Accordingly, in the present description, when describing the structure of the screen, the upper part means a rear side of the screen when viewed from the viewer's point of view, that is, from the viewer's point of view, in the beam projector screen. .

The present invention can be applied to various changes and may have various forms, and specific embodiments will be illustrated and described in detail below. However, this is not intended to limit the present invention to a specific disclosure form, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included.

Hereinafter, the present invention will be described in detail.

The coating composition for forming a beam projector screen of the present invention comprises: A) a hydrophilic binder; B) fine particles of metal oxide fine particles having an average particle diameter (D50) of 0.03 to 0.1 µm; C) hollow silica particles; And D) a solvent;

C) The hollow silica particles include: c1) first hollow silica particles having an average particle diameter (D50) of 25 to 35 μm; And c2) second hollow silica particles having an average particle diameter (D50) of 1 to 15 μm.

The hydrophilic binder component, to enable uniform mixing of various components in the composition, and to improve the coatability and processability, when applied and dried on a substrate, maintains the shape of the film firmly, thereby producing a beam projector screen It serves to secure durability.

The hydrophilic binder is specifically selected from the group consisting of, for example, a silicone-acrylate-based binder, a silica sol-based binder, a vinyl acetate-based binder, a polyvinyl alcohol-based binder, a urethane-based binder, and a silicone-based organic-inorganic hybrid binder. It may be desirable to include more than one species.

The above-mentioned binder component has hydrophilicity in particular, and in the state applied and dried on the substrate, it is possible to firmly maintain the properties of the film, but when contacting a hydrophilic solvent such as water, it has the characteristics of easily detaching from the substrate. have. Due to this feature, the screen for a beam projector manufactured according to one aspect of the present invention can be manufactured by a very easy and simple method, and it is also possible to remove it very easily.

And the metal oxide fine particles, titanium (Ti), molybdenum (Mo), tantalum (Ta), tungsten (W), vanadium (V), aluminum (Al), zinc (Zn), indium (In), tin (Sn ), And one or more of oxides of metals selected from the group consisting of antimony (Sb).

These metal oxide fine particles can effectively block the reflected light in the near-visible and non-visible light regions and maintain the transmission and reflectance of visible light at an appropriate level, thereby greatly improving the visibility of the screen when irradiating a beam projector.

The metal oxide fine particles may have an average particle diameter of about 0.03 to about 0.1 μm.

When the average particle diameter is within the above range, transmission and blocking rates for visible light can be maintained, and when applied, it is not directly involved in irregularities formed on the surface of the coating layer, so that the visibility of the screen can be effectively adjusted when irradiating a beam projector. do.

The metal oxide fine particles may be preferably included in about 30 to about 60 parts by weight based on 100 parts by weight of the hydrophilic binder. When too small an amount of metal oxide fine particles is used, it is difficult to obtain the above-described effect, and when an amount greater than the above range is used, the color of the beam projector screen to be manufactured or the transmittance of the visible light region is affected. When irradiating the projector, a problem that optical properties are deteriorated may occur.

In one embodiment of the present invention, the hollow silica particles, both of the first hollow silica particles having a relatively large particle size, and the second hollow silica particles having a relatively small particle size.

The first hollow silica particles, upon application of the composition, impart unevenness to the surface of the coating layer, and may cause light refraction, scattering, and diffuse reflection, and accordingly, may serve to increase the visibility of the screen when irradiating a beam projector. .

Specifically, the first hollow silica particles may have an average particle diameter of about 25㎛ to about 35㎛. When the particle size of the first hollow silica particles is too small, refraction and scattering of the beam projector light emitted from the rear surface may be reduced, which may cause a problem that the visibility of the screen is deteriorated. If the particle size is too large, the translucent layer of the screen In the so-called, the parallel transmission of light irradiated from the beam projector increases, so that the light is concentrated only in a certain area corresponding to the central portion of the lens of the beam beam projector, so that the illuminance value varies greatly depending on the area on the screen to which the beam projector is irradiated. A problem in which bright spots are severely generated may occur.

And, the second hollow silica particles, when the composition is applied, does not directly participate in the unevenness of the surface of the coating layer, and may cause an internal scattering inside the coating layer, thereby increasing the internal haze value.

The internal haze value (Hi) means a haze value resulting from particles or the like contained in the film, as described above. Specifically, such an internal haze value is a haze measured after removing the surface irregularities by attaching a transparent adhesive film to the film surface in order to remove the surface haze, a factor resulting from the surface irregularities in a film having irregularities on the surface. Mean value.

In an optical member such as a film or coating, the transmittance and haze characteristics are changed according to the type of introduced particles contained in the film. The above-described second hollow silica particles having a relatively small particle size have a high light transmittance value. 1 Compared to the hollow silica particles, by causing light refraction and scattering inside the coating layer, a relatively high internal haze is realized, and a screen having excellent transmittance value can be provided.

In particular, the second hollow silica particles significantly reduce the parallel transmittance value during screen manufacturing and increase the diffuse transmittance value, thereby effectively suppressing the occurrence of the above-described bright spot. It becomes possible.

And, according to an embodiment of the present invention, from the above-mentioned optical point of view, the hollow silica particles may be included in about 50 to about 75 parts by weight relative to 100 parts by weight of the hydrophilic binder.

When an amount less than the above range is used, it is difficult to obtain the above-mentioned optical effect, and when using an amount above the above range, solution stability and applicability of the composition decrease, making it difficult to form a uniform surface screen. A problem that many bright spots occur in each portion of the screen to be manufactured may occur.

In addition, among these, c1) the first hollow silica particles and c2) the second hollow silica particles in a weight ratio of about 5: 5 to about 1: 9, the silica particles having a relatively small particle diameter are larger silica particles It may be preferable to use it in the same amount as or in a large amount in terms of improving visibility of the beam projector and suppressing bright spots.

And, the solvent includes water; Alcohol solvents such as methanol, ethanol, isopropyl alcohol, and butanol; Alkoxy alcohol solvents such as 2-methoxyethanol, 2-ethoxyethanol, and 1-methoxy-2-propanol; Ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl propyl ketone, and cyclohexanone; Propylene glycol monopropyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethyl glycol monoethyl ether, diethyl glycol monopropyl ether , Ether-based solvents such as diethyl glycol monobutyl ether and diethylene glycol-2-ethylhexyl ether; Aromatic solvents such as benzene, toluene, and xylene may be used alone or in combination.

Since the content of the solvent can be variously adjusted within a range that does not degrade the physical properties of the coating composition, it is not particularly limited, but for the solid content of the components included in the coating composition, the solid content: the weight ratio of the solvent is about 30:70 To about 99: 1. When the solvent is in the above range, it may have appropriate fluidity and coatability.

On the other hand, the coating composition for forming the beam projector screen, in addition to the aforementioned components, may further include additives commonly used in the technical field to which the present invention pertains, such as anti-yellowing agents, leveling agents, antifouling agents, wetting agents, antifoaming agents, and the like. .

In addition, the content can be variously adjusted within a range that does not impair the other properties of the screen for a beam projector to be produced, but is not particularly limited, for example, with respect to 100 parts by weight of the binder component, about 0.1 to about 10 parts by weight Can be included.

The leveling agent uses a coating composition, and serves to make the surface of the coated coating film uniform.

As the wetting agent serves to lower the surface energy of the coating composition, when coating the coating composition on the transparent substrate layer, it helps to achieve uniform application.

At this time, the anti-foaming agent may be added to remove air bubbles in the coating composition.

Additionally, the leveling agent, wetting agent, and anti-foaming agent, when applying the coating composition, may affect the dispersibility of the particles contained therein and the formation of irregularities on the coating surface.

In addition, the additive may include an anti-yellowing agent, and examples of the anti-yellowing agent include a benzophenone-based compound or a benzotriazole-based compound.

Meanwhile, according to another aspect of the present invention, a transparent substrate; And a translucent layer formed by the above-described composition on at least one surface of the substrate.

As a base material for the composition application, glass, polyester such as polyethylene terephtalate (PET), cyclic olefin copolymer (cyclic olefin copolymer, COC), polyacrylate (polyacrylate, PAC), polycarbonate (polycarbonate, PC), polyethylene (PE), polyalkyl (meth) acrylate, polyetheretherketon (PEK), polyethylenenaphthalate (PEN), polyetherimide (polyetherimide, PEI), polyimide (PI), or triacetylcellulose (TAAC), etc., most preferably glass, and, in addition, used as interior and exterior materials for construction, etc. As long as it is a transparent substrate in various forms capable of maintaining strength and form, it can be used without particular limitation.

The translucent layer may have an adhesive strength to a substrate of 4B or more, measured according to ASTM D 3359, and a hydrophilic solvent contacted to the translucent layer, or an adhesive strength to a substrate of 0B or less, measured according to ASTM D 3359.

More specifically, when a cross-cut test was performed on the surface of the translucent layer, the portion peeled by the tape was less than about 5% of the total area, and the adhesion between the translucent layer and the substrate may be 4B or 5B.

In addition, as described above, in the beam projector screen according to the present invention, the composition for forming the translucent layer is basically fixed to the surface of the substrate by a hydrophilic binder, so that a hydrophilic solvent such as water is brought into contact with it. , After making the translucent layer wet again in the solvent, when the cross-cut test was performed again, a portion exceeding about 65% of the entire area was peeled off, so that the adhesion between the translucent layer and the substrate was 0B or less, and accordingly, It may be in an easily removable form.

In addition, the beam projector screen may have a form that satisfies Expression 1 below.

A screen for a beam projector that satisfies Equation 1 below:

[Equation 1]

In the above formula,

d ₁ is an average particle diameter (D50) of the first hollow silica particles,

T is the dry thickness of the translucent layer,

d ₂ is the average particle diameter (D50) of the second hollow silica particles.

When Equation 1 is satisfied, in the translucent layer of the screen for the beam projector, the first hollow silica particles are formed to protrude on the surface of the translucent layer, which can effectively induce diffuse reflection of visible light on the screen surface. . At the same time, the second hollow silica particles, most of which are embedded in the surface of the semi-transparent layer, scattering and refracting light inside the semi-transparent layer without directly participating in diffuse reflection, thereby increasing the internal haze, Accordingly, the visibility of the screen for the beam projector can be greatly improved.

In addition, the beam projector screen may have a form that satisfies Expression 2 below.

[Equation 2]

In the above formula, A1 is the largest cross-sectional area of the first hollow silica particles, and A2 is the cross-sectional area of the first hollow silica particles exposed on the translucent layer.

Here, the term “maximum cross-sectional area of the first hollow silica particles” refers to the maximum value of the cross-sectional area that can be observed when it is assumed that the spherical particles are cut by an arbitrary plane. Specifically, the first hollow silica particles are Assuming a complete sphere, it means the area of the cross section by a plane passing through the center point of the sphere.

And, the "cross-sectional area of the first hollow silica particles exposed on the semi-transparent layer" is a plane passing outside the semi-transparent layer when the first hollow silica particles are exposed to the outside of the semi-transparent layer to form irregularities It means the cross-sectional area by.

That is, when the above expression 2 is satisfied, in the semi-transparent layer of the screen for the beam projector, the first hollow silica particles are exposed to the outside of the semi-transparent layer only in a certain region of the total particles, thereby forming external irregularities. By increasing the surface haze value of the screen for the beam projector, it can serve to scatter and refract light.

Due to the above characteristics, the screen for a beam projector according to an embodiment of the present invention has a haze value of about 90 to about 97 according to JIS K 7136, and has a high haze value. The irradiated light source can be effectively scattered and refracted, and an excellent image can be realized.

In addition, the beam projector screen according to the embodiment has a total light transmittance value of about 85 to about 90% according to the JIS K 7361 standard, and has a high light transmittance, so that an image with excellent brightness can be realized. Even when a projector is not used, it is possible to provide effective indoor lighting by natural light, such as sunlight, in exterior materials of buildings, such as glass windows.

In addition, according to another embodiment of the present invention, the beam projector screen may have a diffusion transmittance value of about 80 to about 85 and a parallel transmittance value of about 1 to about 5 according to JIS K 7361. That is, the screen for the beam projector has a relatively high diffusion transmittance value, effectively dispersing the light source irradiated from the beam projector, thereby realizing an image of excellent image quality, and at the same time, a relatively low value of the parallel transmittance value. By having, it is possible to effectively suppress the occurrence of the bright spot described above.

The above-described coating composition for forming a beam projector screen and a beam projector screen manufactured using the same, in particular, can be easily applied to a glass surface, and thus can be used as a beam projector screen by applying and drying it on the inner and outer glass windows of a building. , In particular, it can be used as an outdoor billboard of a building at a low cost.

Hereinafter, the operation and effects of the invention will be described in more detail through specific examples of the invention. However, these examples are only presented as examples of the invention, and the scope of the invention is not thereby determined.

< Example >

Beam projector  Preparation of paint composition for screen formation

Mixing according to the following composition, to prepare a coating composition for forming a beam projector screen.

Silicone acrylate-based binders NR-1000 and HC-800 were mixed at a weight ratio of 1: 1, and used as a hydrophilic binder (manufactured by Press Paint Co., Ltd.).

Metal oxide fine particles: Indium-tin oxide (ITO) and antimony-tin oxide (Antimony Tin Oxide, ATO) having an average particle diameter (D50) of 50 nm were used by mixing in a weight ratio of 1: 1.

As the first hollow silica particles, those having an average particle diameter (D50) of 30 µm (manufactured by Insuladd) were used.

As the second hollow silica particles, an average particle diameter of about 4.4 µm (Sibelco Korea, SS0030) and an average particle diameter of about 10.9 µm (Sibelco Korea, SS0090) are used by mixing in a weight ratio of 1: 1. And, the average particle diameter (D50) of the mixed second hollow silica particles was measured to be about 7.2 μm (measuring device: CILAS 1064).

The solvent was used by mixing ethyl acetate, acetone, ethanol, and methyl ethyl ketone in the same weight ratio.

As a leveling agent, 0.3 wt% of BYK300 was used, and in addition to the composition shown in Table 1, a residual amount of solvent was used.

The composition of each Example and Comparative Example is summarized in Table 1 below.

bookbinder
(wt%) Metal oxide fine particles
(wt%) The first
Hollow silica particles
(wt%) 2nd
Hollow silica particles
(wt%) Example 1 35 15 7 18 Example 2 35 15 5 20 Example 3 35 15 3 22 Comparative Example 1 35 15 - 25

After the coating composition for forming the beam projector screen was applied to one surface of a transparent glass using a paint roller, a semi-transparent layer was formed by natural drying to produce a beam projector screen.

After drying, the average thickness of the translucent layer was measured to be about 17 μm. Accordingly, the beam projector screen may satisfy Equation 1 above.

1 is a cross-sectional view of a beam projector screen according to an embodiment of the present invention.

Referring to Figure 1, the beam projector screen according to an embodiment of the present invention, a transparent substrate 100; And a translucent layer 200 formed by the above-described composition on at least one surface of the substrate.

In addition, inside the translucent layer 200, the first hollow silica particles 220 in the form of unevenness by being dispersed in the above-described binder and partially protruding over the surface of the translucent layer and the interior of the translucent layer In the form completely buried in, it can be seen that the second hollow silica particles 210 are not involved in the formation of external irregularities.

2 is an image obtained by observing a surface through an optical microscope for a beam projector screen according to Examples and Comparative Examples of the present invention.

Referring to FIG. 2, in a beam projector screen according to an embodiment of the present invention, a part of the first hollow silica particles in a form protruding over the surface of the translucent layer to form irregularities and completely inside the translucent layer In the buried form, the second hollow silica particles, which are not involved in the formation of external irregularities, can be clearly observed.

In FIG. 2, the particle diameter of the second hollow silica particle and the particle diameter of the portion where the particle protrudes onto the semi-transparent layer surface were measured through an image analysis program and summarized in Table 2 below.

Particle size
(㎛) Part size of protrusion
(㎛) Cross section
(㎛ ² ) Projected section cross-section
(㎛ ² ) Example 1 31.425 27.393 775.21 589.05 Example 1 29.216 27.183 670.06 580.05 Example 1 30.003 28.025 706.64 616.54 Example 2 28.331 26.761 630.07 562.18 Example 2 35.744 30.554 1002.94 732.83 Example 2 27.137 25.918 578.09 527.32 Example 3 26.974 22.336 571.16 391.63 Example 3 25.408 21.072 506.77 348.56 Example 3 24.071 22.125 454.84 384.27

Referring to Table 2, in the translucent layer of the screen for a beam projector according to an embodiment of the present invention, the first hollow silica particles are exposed to the outside of the translucent layer, only a certain area of the total particles, thereby preventing external irregularities. It can be clearly seen that the particles are formed, and the particles are regarded as spherical, and when the maximum cross-sectional area and the cross-sectional area of the protruding portion are calculated, it can be clearly confirmed that Equation 2 described above is satisfied.

The physical properties of the beam projector screen were measured by the following method. For the evaluation, a 5000 ANSI beam projector was used and projected on a screen at a distance of 70 cm.

(One) Bright Spot  evaluation

The beam projector screens prepared in the above Examples and Comparative Examples are divided into 3 * 3 hexagonal keypads (A to H, upper left: A, lower right: I), and projected from the rear by projecting a white test screen of the beam projector, By measuring the illuminance of straight light, the standard deviation values of the overall average illuminance and the illuminance were calculated.

(2) Illuminance and viewing angle evaluation

White, 80 g / m ² , when the beam projector is projected on the front of the paper is 1, and when the beam projector is projected on the front of the mirror is 100, relative to the beam projector screen according to each embodiment and comparative example. The light quantity value was measured. (Gain value, G)

Based on the gain value when looking at the screen from the front, the angle with the gain value of half was measured and the viewing angle was evaluated.

(3) Evaluation of ease of removal

By the cross-cut test of ASTM D 3359, the adhesion of the beam projector screens of Examples and Comparative Examples was evaluated (Adhesive force A), and water was sprayed on the surface, followed by contact with a hydrophilic solvent, and then the adhesion was evaluated in the same manner (Adhesive force) B).

(4) Evaluation of optical properties

Haze value according to JIS K 7136 standard, total light transmittance value according to JIS K 7361 standard, diffusion transmittance value, and parallel transmittance value were measured using NDH-5000 of GNB TECH.

The results are summarized in Table 3 below.

unit Example 1 Example 2 Example 3 Comparative Example 1 Average illuminance (Lux) 224.1 219.5 225.7 211.4 Standard deviation of illuminance 100.7 113.3 112.5 204.2 Viewing angle (degree) 30.0 29.7 28.1 25.5 Adhesion A 5B 5B 5B 5B Adhesion B 0B 0B 0B 0B Haze 94.58 95.53 96.58 86.73 Total light transmittance (TT) 88.99 87.88 85.83 90.33 Diffuse transmittance (DT) 84.11 83.95 81.93 78.34 Parallel transmittance (PT) 4.88 3.93 3.90 11.99

Referring to Table 3, it can be seen that the beam projector screen according to the embodiment of the present invention has an excellent illuminance value and a relatively small illuminance standard deviation value, so that the occurrence of bright spots is significantly reduced.

In particular, the beam projector screen according to an embodiment of the present invention, the average illuminance value is mostly about 200 or more, when compared to a comparative example, or a screen used in the past, or the like, can exhibit almost the same or more brightness Can be confirmed.

3 is a photograph observed from the front when the test screen of the beam projector is projected from the rear side of the beam projector screen according to the embodiment and the comparative example of the present invention. Due to the characteristics of an image implementing apparatus called a beam projector in which a lens is used in the center for condensing, it is difficult to completely prevent the occurrence of bright spots, but in the case of a screen according to an embodiment of the present invention, despite the high illuminance value, The illuminance standard deviation value is reduced, so that the entire screen is bright, uniform, and the image can be clearly seen. On the other hand, in the case of the comparative example, the occurrence of bright spots in which the center portion has higher illuminance than the edge portion can be clearly observed even with the naked eye.

The above characteristics can be clearly confirmed even with specific numerical values. Specifically, according to an embodiment of the present invention, in the case of a screen for a beam projector, it can be seen that a relatively high internal haze can be realized and an excellent transmittance value is obtained. In addition to this, although the parallel transmittance value is small, the diffuse transmittance value is relatively high, and the occurrence of the bright spot described above can be suppressed very effectively.

In addition, in the beam projector screen according to the embodiment of the present invention, in a state in which the composition is applied and dried, the adhesion between the translucent layer and the substrate layer is 4B or more, and it can be confirmed that they are very firmly attached to each other and sprayed with water. Afterwards, it can be confirmed that the adhesive force is 0B, which is very easily removed.

100: description
200: translucent layer
210: second hollow silica particle
220: first hollow silica particles

Claims (13)

A) hydrophilic binders;
B) metal oxide fine particles having an average particle diameter (D50) of 0.03 to 0.1 µm;
C) hollow silica particles; And
D) solvents;
C) The hollow silica particles,
c1) first hollow silica particles having an average particle diameter (D50) of 25 to 35 μm; And
c2) includes second hollow silica particles having an average particle diameter (D50) of 1 to 15 μm,
The hydrophilic binder is a silicone-acrylate-based binder,
Coating composition for beam projector screen formation.
delete According to claim 1,
B) the metal oxide fine particles;
Titanium (Ti), molybdenum (Mo), tantalum (Ta), tungsten (W), vanadium (V), aluminum (Al), zinc (Zn), indium (In), tin (Sn), and antimony (Sb) Containing at least one of the oxide of the metal selected from the group consisting of;
Coating composition for beam projector screen formation.
According to claim 1,
The metal oxide fine particles, 30 to 60 parts by weight based on 100 parts by weight of the hydrophilic binder, the coating composition for forming a beam projector screen.
According to claim 1,
The hollow silica particles, 50 to 75 parts by weight based on 100 parts by weight of the hydrophilic binder, the coating composition for forming a beam projector screen.
According to claim 1,
C) the hollow silica particles;
c1) a first hollow silica particle and c2) a second hollow silica particle, c1) a first hollow silica particle: c2) a second hollow silica particle ratio, comprising a weight ratio of 5: 5 to 1: 9;
Coating composition for beam projector screen formation.
Transparent substrates; And
On at least one side of the substrate, comprising a translucent layer, formed by the composition according to claim 1;
Screen for beam projector.
The method of claim 7,
The translucent layer, the adhesive strength according to ASTM D 3359 is 4B or more,
A screen for a beam projector having an adhesive strength of 0B or less according to ASTM D 3359 after contacting a hydrophilic solvent.
The method of claim 7,
A screen for a beam projector that satisfies Equation 1 below:
[Equation 1]

In the above formula,
d ₁ is an average particle diameter (D50) of the first hollow silica particles,
T is the dry thickness of the translucent layer,
d ₂ is the average particle diameter (D50) of the second hollow silica particles.
The method of claim 7,
A screen for a beam projector that satisfies Expression 2 below:
[Equation 2]

In the above formula, A1 is the largest cross-sectional area of the first hollow silica particles, and A2 is the cross-sectional area of the first hollow silica particles exposed on the translucent layer.
The method of claim 7,
A screen for a beam projector having a haze value of 90 to 97 according to JIS K 7136 standard.
The method of claim 7,
A beam projector screen having a total light transmittance value of 85 to 90% according to JIS K 7361 standard.
The method of claim 7,
A screen for a beam projector having a diffuse transmittance value of 80 to 85 and a parallel transmittance value of 1 to 5 according to JIS K 7361 standard.

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