TW201801915A - Pasting projection screen - Google Patents

Abstract

The present invention provides a screen that is made thin to the extent of not causing blurring of images, exhibits sufficient projection characteristics as transmission screen, excellent durability or adhesion to adherents such as glass, excellent repeelability, and for which visibility is not reduced by the entrainment of air bubbles or the like upon reuse after peeling. A pasting projection screen contains a substrate and a light diffusion layer, wherein the light diffusion layer contains a silicon resin and organic microparticles having an average particle diameter of 1 to 10 [mu]m, the thickness of the light diffusion layer is adjusted to a value of 5 to 30 [mu]m, and wherein, on the light diffusion layer side, the 180 DEG peeling force measured according to JIS Z 0237:2009 is adjusted to a value of 20 to 200 mN/25 mm and the haze value measured according to JIS K 7136:2000 is adjusted to a value of 20% or more.

Description

Attached projection screen

The present invention relates to an attachment type projection screen (hereinafter sometimes referred to as a screen) attached to an adherend on a window glass or the like to enlarge and project an image irradiated from a projector.

As a transmissive projection screen used in a rear projection display, a combination of a Fresnel lens and a convex lens is known.

However, the conventional projection screen generally has a small size, and on the other hand, the recognized image is dark and prone to problems such as moiré patterns in the image.

In addition, the conventional projection screen also adopts a method of arranging black stripes on the focal surface of the convex lens so as not to attenuate the condensed projection light. The black stripes absorb a part of the external light and suppress the decrease in contrast caused by external light.

However, in reality, part of the external light is not absorbed in the black stripes and penetrates into the optical system, so the decrease in contrast is still a problem.

Therefore, the proposal has a self-adhesive attached to a transparent body such as a window. A transmissive screen in an image recognized by a viewer located on the back side by an image emitted by the projector (for example, refer to Patent Document 1).

More specifically, as shown in FIG. 6, it is a transmission type composed of a hard coat layer, a transparent body (first transparent body), a forward-scattering light scattering layer, an adhesive layer, and a transparent body (second transparent body). screen.

In addition, it is preferable that the front light-scattering light scattering layer is prepared by disposing a specific amount of spherical particles having an average particle diameter of 1 to 10 μm in a transparent adhesive. For the refractive index of the transparent adhesive, the relative refraction of the spherical particles The ratio (n) is a value in the range of 0.91 <n <1.09, and further, a transmission type screen having a haze value of 3% or more and an image sharpness of 60% or more.

In addition, there is also proposed a rear projection system that has a high peripheral light removal rate and uses a flexible transmission screen (for example, refer to Patent Document 2).

More specifically, it is a rear projection system comprising the steps of: providing a projector capable of prompting an image; and providing a flexible screen having a rear surface that receives light from the projector The display on the opposite side to the back, when the image is not projected on the screen by the projector, the screen becomes substantially an opaque light absorbing layer under the conditions of bright surroundings; the step of providing a peelable adhesive; selecting in the audiovisual position A step of providing a substantially transparent surface; a step of using a peelable adhesive to provide a screen on a substantially transparent surface; a step of projecting an image from a projector to the back of the screen to provide information to a viewer.

Further, as the flexible screen, a bead type screen composed of a single layer of glass beads having an average particle diameter of more than about 20 μm to less than 400 μm, an opaque black base material, and a substrate such as polyvinyl chloride is preferably used.

In addition, the adhesive for adhering the screen to the transparent surface is preferably a peelable adhesive having a peeling force of 0.5 to 2 lbs / inch (about 280 to 1100 mN / 25 mm) as a main component, such as a particulate acrylic adhesive.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2007-34324 (Scope of patent application, etc.)

[Patent Document 2] Japanese Patent Publication No. 2004-533636 (Scope of patent application, etc.)

However, the transmissive screen disclosed in Patent Document 1 is basically a structure in which a forward-scattering light scattering layer is sandwiched between a transparent body (first transparent body) and a transparent body (second transparent body).

Therefore, the front-scattering light-scattering layer and the adhesive layer are separated separately, and the transmission screen becomes too thick. When a specific image is projected, it is seen that the image generates a problem that requires bokeh.

In addition, the front-scattering light-scattering layer is sandwiched between the transparent body (the first transparent body) and the transparent body (the second transparent body), so the transmission type screen is basically not considered for the adherend (glass plate, etc.). The problem of poor ease of use is also seen.

The use of a flexible transmission type disclosed in Patent Document 2 In the rear projection system of the screen, a flexible screen containing a bead type screen and a peelable adhesive layer are also independently provided.

As a result, the entire transmissive screen becomes too thick, and the problem of bokeh appears in the image. Furthermore, although the adhesive layer can be peeled off, the adhesiveness lacks durability and there is a concern that it may peel off accidentally.

In addition, the average particle size of beads such as a bead type screen is too large, and it is not only difficult to use it as a screen for projecting a high-definition image, but also a problem of lack of light diffusivity is seen.

That is, it is an object of the present invention to provide a screen which is thinly constructed so as not to cause image bokeh, has sufficient projection properties as a transmissive screen, and further has an adherence to an adherend such as glass and its durability. It has excellent properties and excellent re-peelability. Even when it is used again after temporary peeling, there is no decrease in visibility due to the incorporation of bubbles or the like.

According to the present invention, an attached projection screen is provided, which can solve the above problems. The attached projection screen is characterized by including a substrate and a light diffusion layer. The light diffusion layer contains a silicone resin and an average particle size is For organic fine particles of 1 to 10 μm, the thickness of the light diffusion layer is in a range of 5 to 30 μm, and the 180 ° peeling force measured on the light diffusion layer side in accordance with JIS Z 0237: 2009 is in a range of 20 to 200 mN / 25 mm. The turbidity value measured in accordance with JIS K 7136: 2000 is 20% or more.

That is, by using polysiloxane as the main agent of the light diffusion layer, and By using organic fine particles with a specific average particle diameter (Φ), and controlling the thickness (t) of the light diffusion layer or the 180 ° peeling force, and the turbidity value within a specific range, it is possible to obtain a thin image that does not cause a problem in image bokeh ( The number of thin films is small), it has excellent projection properties as a screen, can be attached without entraining air bubbles, has excellent adhesion to glass and other adherends, and has excellent durability. It can be easily peeled after use and can not be entrained when reused Bubble type attached projection screen.

Moreover, when constituting the attachment type projection screen of the present invention, it is preferable that the blending amount (A) of the organic fine particles is a value in the range of 1 to 15 parts by weight based on 100 parts by weight of the silicone resin.

With this configuration, it is possible to stably obtain a turbidity value of a specific value or more without excessively reducing the light transmittance (total light transmittance).

In addition, when constituting the attached projection screen of the present invention, the thickness of the light diffusion layer is preferably t (μm), the blending amount of the organic fine particles is A (parts by weight), and the average particle diameter of the organic fine particles is Φ. In the case of (μm), the influence factor expressed by t × A / Φ is a value in a range of 3 to 100.

By constructing the influence factor thus defined as a value within a specific range, it is possible to obtain an attached projection screen having a turbidity value or adhesion force within a specific range with good accuracy and stability.

Moreover, when constituting the attachment type projection screen of the present invention, it is preferable that the refractive index difference between the silicone resin and the organic fine particles is a value of 0.02 or more.

With such a configuration, a specific turbidity value can be obtained quantitatively and stably.

In addition, it is preferable when constituting the attachment type projection screen of the present invention. The thickness of the substrate is set to a value in the range of 50 to 250 μm.

With this structure, when the silicone resin is coated on the substrate and dried, even when heated to a specific temperature (for example, 130 ° C or higher), the substrate can exhibit specific heat resistance and maintain good smoothness. In addition, an attached projection screen with better light diffusivity or full light transmittance can be obtained.

In addition, when constituting the stick-type projection screen of the present invention, it is preferable that both the MD direction and the TD direction of the substrate after the thermal shrinkage of the substrate is heated at 150 ° C. for one hour are both values within a range of 2% or less.

With this structure, when the silicone resin is coated on the substrate and dried, the substrate can exhibit specific heat resistance even when heated at a specific temperature (for example, 130 ° C or higher) for a specific time, and can maintain good smoothness. Sex. From these viewpoints, the thermal shrinkage ratio is more preferably 1.5% or less, and particularly preferably 1.0% or less.

In addition, when constituting the attachment type projection screen of the present invention, it is preferable to further provide a light control member having anisotropic light diffusivity or isotropic light diffusivity on the front surface and the back surface of the base material or any one of them.

With this structure, it is easy to adjust to the desired turbidity value, which can enlarge the angle at which the viewer can recognize the image. By improving the uniformity of the light diffusion in the screen, most viewers can recognize it well and clearly. image.

In addition, when constituting the attachment type projection screen of the present invention, it is preferable to have a protective film on the surface area layer of the light diffusion layer on the side opposite to the substrate.

By including the protective film in this way, it is possible to prevent dust and the like from being attached to the surface of the light diffusing layer, and the reproducibility of effects such as handling (portability) or light diffusing or attaching properties of the projection screen can be achieved. Better By.

10‧‧‧ Attached Projection Screen (Screen)

12‧‧‧ substrate

14‧‧‧light diffusion layer

14a‧‧‧polysiloxane

14b‧‧‧Organic particles

16‧‧‧ release film

18‧‧‧ Adhered body (window glass or display cabinet, etc.)

20‧‧‧light control member (anisotropic light diffusing film)

21‧‧‧ Attached Composite Projection Screen

22‧‧‧High refractive index hardened

23‧‧‧ Blind Structure

24‧‧‧ Low refractive index hardened

36‧‧‧ incident light

1 (a) to (d) are diagrams showing a configuration example of a projection type projection screen or the like.

Fig. 2 (a) is a graph showing the relationship between the average particle size, turbidity value, and adhesion of the organic microparticles of the attached projection screen, and Fig. 2 (b) is a graph showing the organic particles of the attached projection screen. Fig. 2 (c) is a graph showing the relationship between the film thickness and the turbidity value and adhesion of a light diffusion layer of an attached projection screen, respectively.

FIG. 3 is a graph showing the relationship between the influence factor (t × A / Φ), the turbidity value, and the adhesion force of the attached projection screen.

4 (a)-(b) are diagrams for explaining an anisotropic light-diffusing film.

FIG. 5 is a diagram for explaining the relationship between the incidence angle and the turbidity value in an attached composite projection screen in which an anisotropic light-diffusing film is further laminated on the substrate side of the attached projection screen.

FIG. 6 is a diagram illustrating a state of a conventional light diffusion adhesive sheet.

An embodiment of the present invention is an attached projection screen, which is characterized by including a substrate and a light diffusion layer. The light diffusion layer contains a polysiloxane resin and organic fine particles having an average particle diameter of 1 to 10 μm to diffuse the light. The thickness of the layer is a value in the range of 5 to 30 μm, so that the 180 ° peel force measured at the light diffusion layer side in accordance with JIS Z 0237: 2009 is 20 to A value within a range of 200 mN / 25 mm and a turbidity value measured in accordance with JIS K 7136: 2000 of 20% or more.

Hereinafter, the embodiment of the attached projection screen of the present invention will be specifically described with reference to appropriate drawings.

1. Adhesion of attached projection screen

The attachment type projection screen of this embodiment is characterized in that when the light diffusion layer side is attached to a glass plate of an adherend, a 180 ° peeling force (peeling speed 300 mm / min) measured in accordance with JIS Z 0237: 2009 ( (Hereinafter, it may be referred to simply as "adhesion.") It is adjusted to a range of 20 to 200 mN / 25 mm.

That is, by setting the above-mentioned adhesion force to be 20mN / 25mm or more, even in an air-conditioned room, a heating room, or when the outside air temperature changes, it can maintain the attached state with good durability and function as a screen. From such a viewpoint, the above-mentioned adhesion is preferably 30 mN / 25 mm or more, and more preferably 35 mN / 25 mm or more.

In addition, by setting the adhesion force to 200 mN / 25 mm or less, the screen can be a screen with excellent bubble removal properties during attachment, and can be easily peeled off when not needed. Furthermore, it can also be used as a screen which is excellent in bubble removability similar to the first time even when it is reattached. In addition, the thinner the bubble screen, the more eye-catching, and the higher the screen projection, the more eye-catching.

From these viewpoints, the adhesion is preferably 100 mN / 25 mm or less, and particularly preferably 80 mN / 25 mm or less.

2. Turbidity value of attached projection screen

The screen of this embodiment is characterized by a turbidity value measured in accordance with JIS K 7136: 2000 of 20% or more.

The turbidity value (haze) of the screen is measured using an integrating sphere-type light transmittance measuring device to measure the total light transmittance and diffuse transmittance of the screen, and is obtained from the formulas (2) and (3) shown in the examples. Out of the value.

That is, by making the turbidity value 20% or more, it has a projection property as a screen even in a bright environment. From these viewpoints, the turbidity value is more preferably 50% or more, and particularly preferably 70% or more.

The upper limit of the turbidity value is not particularly limited, but if the turbidity value is excessively increased, the backscattered light may increase and the total light transmittance may be insufficient. From these viewpoints, the turbidity value is preferably a value of 99% or less, and more preferably a value of 98% or less.

3. Substrate composition of attached projection screen

As shown in FIG. 1 (a), a stick-type projection screen (hereinafter sometimes referred to as a screen) 10 is basically a light diffusion layer 14 including a base material 12 and a silicone resin 14a and organic fine particles 14b. Make up.

Before use, in order to prevent adhesion of dirt and the like from the surroundings, as shown in FIG. 1 (b), a protective film 16 is preferably laminated on the surface of the light diffusion layer 14 on the side opposite to the substrate 12.

As shown in FIG. 1 (c), after removing the protective film 16 on the surface, the screen 10 is passed through the light diffusion layer 14 and attached to a glass substrate such as a window glass or a display cabinet of the adherend 18 for use. .

Therefore, the viewer can attach it to the window glass or display cabinet, etc. The type projection screen recognizes the image irradiated from the projector as a moving image or text information of a specific size.

In addition, the structure of the attaching screen shown in FIGS. 1 (c) and (d) is generally such that the light from the projector is incident from the substrate 12 side, but may be a self-adhered body 18 depending on the application. The state of side-incident light from the projector.

Here, the substrate of a part of the screen preferably functions as a support for the light diffusion layer, improves the rationality, portability, ease of manufacture, decoration, etc. of the screen, and provides mechanical protection to the light diffusion layer, UV shielding, anti-oxidation and other functions.

In addition, as described later, the base material may also function as a heat-resistant holding member when a coating liquid containing a silicone resin and organic fine particles is applied and dried.

On the other hand, the light diffusion layer basically has two functions of adhesion to the adherend, diffusion of light from the image of the projector, and good viewing angle characteristics.

That is, the screen has a transmissive screen viewed from the opposite side of the projector through the screen and a reflective screen viewed from the same side as the projector. However, in the case of a transmissive screen, the light diffusion layer has a picture from the projector. The image is directly diffused and transmitted so that the viewers located on the back side of the screen can recognize it.

On the other hand, in the case of a reflective screen, the light diffusing layer has a function of diffusing and reflecting an image from the projector, and identifying a viewer on the projector side of the screen.

In addition, the screen of the present invention can be used in any case of a transmissive screen and a reflective screen, but it is based on the view that the effect of the present invention is used to the maximum. Point, better use as a transmissive screen.

4. Substrate

(1) Type

The type of the substrate is not particularly limited, but preferred are polyethylene terephthalate (hereinafter sometimes referred to as PET film), polybutylene terephthalate, polyethylene naphthalate, and the like. Polyester film.

The reason is that if these polyester films are used, they are excellent in transparency, heat resistance, and mechanical strength and are relatively inexpensive.

More specifically, the reason is that when the silicone resin is coated on the substrate and dried, even if heated to a specific temperature (for example, 130 ° C or higher), the substrate exhibits specific heat resistance, so it can maintain good smoothness. In addition, an attached projection screen having stable light diffusivity or light transmittance can be obtained.

Examples of other plastic films other than polyester films include polyolefin films such as polyethylene films and polypropylene films, cellophane, diacetyl cellulose film, triethyl cellulose film, and ethyl cellulose cellulose butyric acid. Ester film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polyfluorene film, polymer film Ether ether ketone film, polyether 碸 film, polyether 醯 imine film, fluororesin film, polyamine film, acrylic resin film, polyurethane resin film, norbornene polymer film, cyclic olefin One kind or a combination of two or more kinds of a polymer film, a cyclic conjugated diene polymer film, an ethylene alicyclic hydrocarbon polymer film, and the like are preferred films.

In addition, in the base material, especially a plastic film, for the purpose of improving the adhesion with the light diffusion layer, it is preferable to perform a primer coating treatment, an oxidation method, and a roughening treatment (concavo-convex method) on one or both sides as desired. And other surface treatment.

Examples of the oxidation method include, for example, corona discharge treatment, chromic acid treatment, flame treatment, silicified flame treatment, hot air treatment, and ozone. One or more combinations of ultraviolet treatment and the like.

Examples of the roughening treatment include a sandblasting method, a solvent treatment method, and an etching treatment method.

In addition, the form of the substrate can be appropriately changed depending on the use or purpose, but it is also preferably a porous film having an opening such as an opening having a diameter of 0.1 to 10 mm. The reason is that based on this form, flexibility or handling can be improved, and it can be applied not only to flat adherends but also to curved adherends.

(2) Thickness

The thickness of the substrate is usually preferably a value in the range of 50 to 250 μm.

The reason is that if the thickness of the base material is less than 50 μm, the micro-fluctuations may occur on the base material due to heating during the formation of the light diffusion layer, and the sharpness of the screen image may be reduced.

On the other hand, when the thickness of the substrate exceeds 250 μm, the bokeh of the image on the screen becomes larger due to the thickness of the substrate, and the sharpness of the image may decrease.

Therefore, the lower limit thickness of the substrate is more preferably set to a value of 100 μm or more, and more preferably set to a value of 120 μm or more.

The upper limit thickness of the substrate is more preferably a value of 220 μm or less, and even more preferably a value of 190 μm or less.

(3) Thermal shrinkage

The thermal shrinkage of the substrate can be measured in accordance with JIS K 7133: 1999, and it is preferable that both the MD direction and the TD direction after the object temperature is 150 ° C. for 1 hour are 2% or less.

The reason is that by setting the thermal shrinkage of the base material in this way, when the polysiloxane resin is coated on the base material and dried, the base material can exhibit a specific heat resistance even when heated at a specific temperature for a specific time, and can maintain good Of smoothness.

However, when the thermal shrinkage of the base material is too small, the usable base material is excessively restricted, and the extension heat treatment and the like for adjusting the thermal shrinkage are complicated, and the manufacturing cost may be significantly increased.

Therefore, the lower limit of the thermal shrinkage of the substrate is more preferably set to a value of 0.001% or more, and more preferably a value of 0.01% or more.

The upper limit of the thermal shrinkage of the substrate is more preferably a value of 1.5% or less, and even more preferably a value of 1.0% or less.

In addition, the MD direction means a length direction when the base film is formed, and the TD direction means a width direction when the base film is formed.

(4) Light transmittance (visible light transmittance)

In addition, the light transmittance of the substrate is preferably 80% or more in the visible light region. on.

The reason is that by limiting the light transmittance of the base material in this way, the light absorption of the base material can be limited, and as a result, the viewer can recognize a bright and bright image on the back side of the screen.

However, when the light transmittance of the base material is too high, the usable base material is excessively restricted, which complicates the extension heat treatment for adjusting the light transmittance, etc., and the manufacturing cost may be significantly increased.

Therefore, the lower limit of the light transmittance of the substrate is more preferably set to a value of 82% or more, and more preferably to a value of 85% or more.

The upper limit of the light transmittance of the substrate is more preferably a value of 99.9% or less, and even more preferably a value of 99% or less.

5. Light diffusion layer

(1) Polysiloxane resin

(1) -1 main component

When the light diffusion layer contains a silicone resin together with the organic fine particles, the screen containing the same can be attached to the adherend, and at the same time, it can be peeled off and reused.

That is, the light diffusion layer containing the polysiloxane resin as the main component is characterized in that it is difficult to generate optical defects due to the mixing of bubbles due to the self-adhesiveness while extruding air while attaching to the adherend. .

This screen is the same effect as the harder one. That is, the screen can prevent air bubbles from being mixed in and can be applied on site by using a light diffusion layer mainly composed of silicone resin.

In addition, a light diffusion layer containing a silicone resin as a main component is adhered to the adherend and adhered very strongly, and on the other hand, it can be peeled off without residue.

In addition, the light-diffusion layer containing silicone as the main component is used in the part closest to the adherend such as window glass, and even in the part closest to external light irradiation, but by using silicone, It is also excellent in light resistance.

Here, the polysiloxane resin may contain, for example, an organic polysiloxane and a derivative thereof, or any one of them as a main component.

It is particularly preferable to contain an addition-molded organopolysiloxane and a platinum catalyst containing an organopolysiloxane having an alkenyl group and an organohydrogen polysiloxane as the main component and having a siloxane bond as the main skeleton. Composition of polysiloxane.

The organopolysiloxane having an alkenyl group having the siloxane bond as the main skeleton is specifically a compound represented by the following formula (1), and is preferably a compound having at least two alkenyl groups in the molecule.

R1 _a SiO _{(4-a) / 2} (1)

(In formula (1), R1 is the same or different carbon number 1 to 12, preferably 1 to 8 unsubstituted or substituted monovalent hydrocarbon group, a is 1.5 to 2.8, preferably 1.8 to 2.5, more preferably It is a positive number in the range of 1.95 to 2.05).

Examples of the unsubstituted or substituted monovalent hydrocarbon group bonded to a silicon atom represented by R1 include vinyl, allyl, propenyl, isopropenyl, butenyl, hexenyl, and cyclohexenyl. Alkenyl, octenyl, etc. Methyl, ethyl, propyl, isopropyl, butyl, isobutyl, third butyl, pentyl, neopentyl, hexyl, cyclohexyl, octyl, nonyl, decyl, etc. Aryl groups such as phenyl, tolyl, xylyl, naphthyl, aralkyl groups such as benzyl, phenylethyl, phenylpropyl, etc., or some or all of the hydrogen atoms of these groups are subjected to fluorine, Substitutes such as a halogen atom such as bromine and chlorine, and a cyano group include, for example, chloromethyl, chloropropyl, bromoethyl, trifluoropropyl, and cyanoethyl.

In addition, if the alkenyl group in the organopolysiloxane is a vinyl group, it is preferable in terms of short curing time and productivity.

In addition, the organohydrogenpolysiloxane has a SiH group in the molecule, and can be added and hardened with the alkenyl group of the organopolysiloxane having a siloxane as the main skeleton.

(1) -2 Platinum catalyst

Examples of the platinum catalyst used to harden the polysiloxane resin include platinum black, platinum chloride, platinum chloride acid, a reaction product of platinum chloride acid and a monovalent alcohol, and chloroplatinic acid and an olefin. Compounds, platinum acetoacetate and the like.

The amount of the platinum catalyst used is preferably set to a value in the range of 0.01 to 3.0 parts by weight based on 100 parts by weight of the addition-molded organopolysiloxane.

The reason is that if the amount of the platinum catalyst used is less than 0.01 parts by weight, re-peeling cracks may occur due to insufficient hardening.

On the other hand, the reason is that if the amount of the platinum catalyst used exceeds 3.0 parts by weight, the adhesiveness may be deteriorated, and the gelation may be accelerated due to the addition reaction, which may make stable coating operations difficult.

Therefore, the lower limit of the amount of the platinum catalyst used is more preferably set to a value of 0.05 parts by weight or more, and more preferably set to a value of 0.1 parts by weight or more.

The upper limit of the amount of the platinum catalyst used is more preferably a value of 2.5 parts by weight or less, and even more preferably a value of 2 parts by weight or less.

(1) -3 Other polyorganosiloxane

In addition, in order to further improve the adhesion, the polyorganosiloxane containing the main functional component is preferably a polyorganosiloxane containing a trifunctional or tetrafunctional siloxane unit in the molecule.

When the polyorganosiloxane is blended, the blending amount is preferably set to a value of 50 parts by weight or less based on 100 parts by weight of the addition polyorganosiloxane.

The reason is that if the blending amount of the polyorganosiloxane is more than 50 parts by weight, the adhesion force may increase, and re-peeling may become difficult.

However, when the blending amount of the polyorganosiloxane is too small, the addition effect may not be exhibited.

Therefore, the lower limit of the blending amount of the polyorganosiloxane is more preferably a value of 1 part by weight or more, and even more preferably a value of 5 parts by weight or more.

The upper limit of the amount of the polyorganosiloxane to be blended is more preferably a value of 30 parts by weight or less, and still more preferably a value of 20 parts by weight or less.

In addition, conventional additives such as a reaction delaying agent, an antioxidant, and an antistatic agent can be appropriately blended in the silicone resin as components other than the above.

Therefore, when these additives are added, It depends on the kind, but it is preferably a value in the range of 0.01 to 10 parts by weight based on 100 parts by weight of the addition-molded organic polysiloxane.

(1) -4 refractive index

The refractive index of the silicone resin is preferably set to a value in the range of 1.35 to 1.48.

The reason is that if the refractive index of the silicone resin exceeds 1.48, the obtained turbidity value may be too small due to the relationship with the refractive index of the organic fine particles.

On the other hand, the reason is that if the refractive index of the silicone resin is less than 1.35, the types of monomers used to obtain an appropriate silicone resin may be excessively limited.

Therefore, the lower limit of the refractive index of the silicone resin is more preferably set to a value of 1.38 or more, and more preferably to a value of 1.40 or more.

The upper limit of the refractive index of the silicone resin is more preferably a value of 1.47 or less, and even more preferably a value of 1.45 or less.

(2) Organic fine particles

(2) -1 average particle size

The average particle diameter of the organic fine particles is set to a value in a range of 1 to 10 μm.

The reason is that if the average particle diameter of the organic fine particles is less than 1 μm, the turbidity value in the light diffusion layer may be rapidly reduced, or it may be easily aggregated, making it difficult to uniformly disperse.

On the other hand, the reason is that if the average particle diameter of the organic fine particles is more than 10 μm, the adhesion in the light diffusion layer is rapidly reduced, or although it is not easy to aggregate, it may be difficult to uniformly disperse and mix.

Furthermore, the reason is that, based on the average particle size of such organic fine particles, t × A / Φ, which will be described later as an influence factor, can be easily controlled to a value within a specific range, and further, a specific range can be obtained in a more stable and quantitative manner. Turbidity value or adhesion.

Therefore, the lower limit of the average particle diameter of the organic fine particles is more preferably a value of 2 μm or more, and more preferably a value of 3 μm or more.

The upper limit of the average particle diameter of the organic fine particles is more preferably a value of 8 μm or less, and even more preferably a value of 6 μm or less.

The average particle size of the organic fine particles can be obtained by a laser diffraction scattering method.

Here, referring to FIG. 2 (a), the influence of the average particle size of the organic fine particles on the turbidity value (characteristic curve A) and the adhesion (characteristic curve B) of the light diffusion layer (which can also be regarded as a screen) will be described.

That is, the average particle size (μm) of the organic fine particles is expressed on the horizontal axis of FIG. 2 (a), the turbidity value (%) is used on the left vertical axis, and the adhesion force (mN / 25mm) is used on the right vertical axis. Means.

Therefore, as understood from the behavior of the characteristic curve A in FIG. 2 (a), as the average particle size of the organic fine particles increases from 2 μm to 10 μm, the turbidity value tends to increase slightly, and more specifically, since 52% rose to about 63%.

Also, as understood from characteristic curve B, The average particle diameter becomes larger, showing a tendency of a slight decrease in adhesion, and more specifically, it decreases from about 54 mN / 25 mm to about 49 mN / 25 mm.

Therefore, although the influence of the average particle size of the organic fine particles is not so strong, it has a specific effect on the turbidity value or adhesion of the light diffusion layer. Therefore, it can be said that it is an effective influence factor when finely adjusting these values.

(2) -2 Type 1

The type (monomer type) of the organic fine particles is not particularly limited as long as a difference in refractive index with the silicone resin is obtained, for example, 0.02 or more, and a specific turbidity value is obtained, but it is preferably derived from ( (Meth) acrylic resin based on monomers such as meth) acrylate, (meth) acrylic acid, acrylamide, and diol compounds.

The reason is that if the organic fine particles are polysiloxane resin particles or silica particles, the difference in refractive index between the microparticles and the polysiloxane resin is too small, for example, it is less than 0.02, and the obtained turbidity value may be significantly reduced.

Conversely, it can be said that the type of the organic fine particles is preferably selected so that the refractive index difference between the particles and the silicone resin becomes a value of 0.02 or more, and a value of 0.05 or more is particularly added.

In addition, as the type of the organic fine particles, a polycarbonate resin type or a polyester resin type is also known, but these condensation polymers may be easily hydrolyzed, and the durability or light transmittance may be significantly reduced.

Therefore, the type of the organic fine particles is more preferably derived from methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, and (meth) acrylic acid. Heptyl, octyl (meth) acrylate, A (meth) acrylic resin based on at least one of monomers such as 2-ethylhexyl (meth) acrylate and dodecyl methyl (meth) acrylate.

(2) -3 types 2

Regarding the type 2 (crosslinking agent) of the organic fine particles, it is preferable to mix the specific amount of the monomers in the polymerization of the organic fine particles by improving the durability, mechanical strength, glass transition temperature, and light resistance of the organic fine particles. A cross-linking agent such as vinylbenzene, and polymerizes organic fine particles.

That is, it is preferable to formulate the cross-linking agent in a range of 0.1 to 10% by weight relative to the total amount of the monomer (100% by weight), and then perform solution polymerization or titration polymerization to make the average particle size uniform and heat resistant. Cross-linked organic microparticles of equal height.

(2) -4 refractive index

The refractive index of the organic fine particles is preferably determined in consideration of the refractive index difference from the silicone resin, but is generally preferably set to a value in the range of 1.42 to 1.65.

The reason is that if the refractive index of the organic fine particles is less than 1.42, the obtained turbidity value may be too small due to the relationship with the refractive index of the silicone resin. In addition, the reason is that the types of monomers used when obtaining appropriate organic fine particles are excessively restricted, which may increase the manufacturing cost of the organic fine particles.

On the other hand, the reason is that if the refractive index of the organic fine particles exceeds 1.65, there are still monomer species used in obtaining appropriate organic fine particles. This is a situation in which the production cost of organic fine particles becomes excessively restricted.

Therefore, the lower limit of the refractive index of the organic fine particles is more preferably a value of 1.45 or more, and more preferably a value of 1.48 or more.

The upper limit of the refractive index of the organic fine particles is more preferably a value of 1.60 or less, and even more preferably a value of 1.55 or less.

(2) -5 deployment amount

The blending amount of the organic fine particles in the light diffusion layer is controlled to a value within a range of 1 to 15 parts by weight based on 100 parts by weight of the silicone resin (solid content).

The reason is that if the blending amount of the organic fine particles does not reach the value of 1 part by weight, the turbidity value of the light diffusion layer may decrease sharply.

On the other hand, the reason is that if the blending amount of the organic fine particles exceeds a value of 15 parts by weight, the adhesion of the light diffusion layer may be rapidly reduced.

If further stated, the reason is that based on the amount of these organic fine particles, the later-mentioned value of the influence factor t × A / Φ can be easily controlled within a specific range, and a specific range can be obtained more securely and quantitatively. Turbidity value or adhesion.

Therefore, the lower limit of the blending amount of the organic fine particles is more preferably a value of 3 parts by weight or more, and even more preferably a value of 8 parts by weight or more.

In addition, the upper limit of the blending amount of the organic fine particles is more preferably a value of 13 parts by weight or less, and even more preferably a value of 12 parts by weight or less.

Here, referring to FIG. 2 (b), the turbidity value (characteristic curve A) of the blending amount of the organic fine particles with respect to the light diffusion layer (which can also be regarded as a screen) will be described. And the influence of adhesion (characteristic curve B).

That is, in the horizontal axis of FIG. 2 (b), the blending amount (parts by weight) with respect to 100 parts by weight of the silicone fine particles is expressed, and the left vertical axis is represented by the turbidity value (%). The shaft is expressed by adhesion (mN / 25mm).

Therefore, as can be understood from the behavior of the characteristic curve A in FIG. 2 (b), as the compounding amount of the organic fine particles increases from 1 part by weight to 17 parts by weight, the turbidity value tends to increase significantly, more specifically, , From about 24% to about 98%.

Also, as understood from the characteristic curve B, as the amount of the organic fine particles becomes larger, the adhesive force tends to decrease gradually, and more specifically, it decreases from about 54 mN / 25 mm to about 16 mN / 25 mm.

Therefore, the blending amount of the organic fine particles has a strong influence on the turbidity value or adhesion of the light diffusion layer. Therefore, when these values are greatly changed, it can be said to be an effective influence factor.

(3) Thickness

The characteristic is that the thickness of the light diffusing layer is set to a value within a range of 5 to 30 μm.

The reason is that if the thickness of the light diffusing layer is less than 5 μm, it may not only be difficult to obtain the desired adhesion or holding force, but also the turbidity value may be excessively low.

On the other hand, the reason is that if the thickness of the light diffusion layer is more than 30 μm, the curing time becomes long, which is economically disadvantageous, and the optical characteristics of the substrate and the like are poor. Situation.

Therefore, the lower limit of the thickness of the light diffusion layer is more preferably set to a value of 8 μm or more, and more preferably a value of 10 μm or more.

In addition, the upper limit of the thickness of the light diffusion layer is more preferably set to a value of 25 μm or less, and more preferably set to a value of 20 μm or less.

Here, referring to FIG. 2 (c), the effect of the thickness of the light diffusion layer on the turbidity value (characteristic curve A) and the adhesion (characteristic curve B) of the light diffusion layer (which can also be regarded as a screen) will be described.

That is, the horizontal axis of FIG. 2 (c) is expressed by the thickness of the light diffusion layer (μm), the left vertical axis is expressed by the turbidity value (%), and the right vertical axis is expressed by the adhesion (mN / 25mm). .

Therefore, as understood from the behavior of the characteristic curve A in FIG. 2 (c), as the film thickness of the light diffusion layer changes from 10 μm to 25 μm, the tendency of the turbidity value to increase is shown, and more specifically, from about 41% Rose to about 72%.

In addition, as understood from the characteristic curve B, as the film thickness of the light diffusion layer becomes thicker, the adhesion force tends to increase gradually, and more specifically, it increases from about 55 mN / 25 mm to about 65 mN / 25 mm.

Therefore, the film thickness of the light diffusing layer has a strong influence on the turbidity value of the light diffusing layer, so it can be said that it is an effective influencing factor when controlling these numerical changes.

In addition, the film thickness of the light diffusing layer slightly affects the adhesion of the light diffusing layer. Therefore, even if the value is changed in a subtle range, it can be said to be an effective influence factor.

(4) Impact factor

When the thickness of the light diffusion layer is t (μm), the blending amount of the organic microparticles contained therein is A (parts by weight), and the average particle diameter of the organic microparticles is Φ (μm), it is preferable to use t × The influence factor represented by A / Φ is a value in the range of 3 to 100.

The reason is that by controlling the influence factor within this range, it is possible to more easily and stably obtain an attached projection screen having a turbidity value or adhesion within a desired range.

Therefore, the lower limit of the influence factor expressed by t × A / Φ is more preferably a value of 10 or more, and more preferably a value of 30 or more.

Moreover, the upper limit of the influence factor expressed by t × A / Φ is more preferably a value of 80 or less, and even more preferably a value of 60 or less.

Here, referring to FIG. 3, the effect of the influence factor expressed by t × A / Φ on the turbidity value and adhesion of the light diffusion layer (which can also be regarded as a screen) will be described.

That is, the horizontal axis of FIG. 3 is represented by the value (-) of the influence factor represented by t × A / Φ in the light diffusion layer, the left vertical axis is represented by the turbidity value (%), and the right vertical axis is represented by the dense (MN / 25mm).

Therefore, as understood from the behavior of the characteristic curve A in FIG. 3, as the value of t × A / Φ becomes larger, the tendency of the turbidity value to increase significantly is shown.

More specifically, when t × A / Φ is 5, the turbidity value is about 20% lower, but when t × A / Φ becomes 10, the turbidity value rises to about 40%, and further, t × A When / Φ is 20, the turbidity value becomes about 80%, and when it is 50 or more, the turbidity value becomes about 95%, and a saturation tendency is seen.

On the other hand, as understood from the behavior of the characteristic curve B, as the value of t × A / Φ in the light diffusing layer becomes larger, the tendency for the adhesion to decrease gradually is shown.

More specifically, the following tendency is seen: when t × A / Φ is 5 to 25, the adhesion is a value of about 50 to 60 mN / 25 mm, and when t × A / Φ is 30, the adhesion is reduced to less than about 50 mN / 25mm value. When t × A / Φ is 40, the adhesion force is reduced to about 40 mN / 25 mm, and if it is 60 or more, the adhesion force is less than about 20 mN / 25 mm.

Therefore, t × A / Φ in the light diffusion layer has a strong influence on the turbidity value. Therefore, when the value is greatly changed and controlled, it can be regarded as an effective influence factor.

In addition, t × A / Φ in the light diffusion layer also has such an influence on the adhesion force, so when the value is controlled with a subtle range change, it can be said to be an effective influence factor.

6. Light control member 1

As one type of light control member, it is preferable to laminate the anisotropic light diffusing film (such as a louver-type light diffusing film) shown in FIGS. 4 (a) to (b) on the surface of the substrate (the side without the light diffusing layer). .

More specifically, as shown in FIG. 1 (d), it is preferable that the anisotropic light diffusing film 20 be laminated indirectly on the surface side (light incident side) of the light diffusing layer 14 through the substrate 12. The composite projection screen 21 may be a laminated composite projection screen directly laminated without passing through a substrate.

Therefore, when laminated directly without transmitting the substrate, the anisotropic light diffusivity is thin. The film functions as a substrate.

In addition, it is preferable that an adhesive layer or an adhesive layer is usually formed between the anisotropic light diffusing film 20 and the base material 12 to thereby bond the two.

That is, as shown by the characteristic curve A in FIG. 5, it is known that when an anisotropic light diffusion film is used alone as a screen, the profile showing the turbidity value depends on the angle of incidence and changes relatively abruptly.

Therefore, by laminating the anisotropic light diffusive film on the side of the light diffusing layer incident on the projector, it becomes a composite projection screen combining anisotropic light diffusivity and isotropic light diffusivity, as shown in characteristic curve B. The contour showing the turbidity value can be smoother.

Therefore, if it is a composite projection screen with such a smooth change in turbidity value, it does not depend on the angle at which the viewer recognizes the image or the incident angle of the light from the projector to the screen, and makes the viewing angle characteristics (light diffusion incident angle area) The widening can make a relatively large number of visually recognizable and sharp images from the back side of the screen.

In addition, if the composite projection screen is a combination of an anisotropic light-diffusing film and a light-diffusing layer, even when external light is exposed to degrade the performance, there is a difference that the cost can be reused by replacing the light-diffusing layer. Advantages of light-diffusing films.

Furthermore, if this type of composite projection screen is used, even if only the light diffusion layer is used, the turbidity value is still low. The turbidity value due to the anisotropic light diffusing film can be changed as a whole. Control to a higher value.

Here, FIG. 4 (a) is an upper view (top view) of the anisotropic light diffusing film 20, and FIG. 4 (b) is an anisotropic light diffusing film 20 shown in FIG. 4 (a) A cross-sectional view of the anisotropic light diffusing film 20 when cut along the dotted line A-A in the vertical direction and when the cut surface is viewed from the direction of the arrow.

As shown in FIG. 4 (a), the anisotropic light-diffusing film 20 includes a parallel high-refractive-index hardened material 22 having a relatively high refractive index and a relatively low refractive index in a direction parallel to the film surface. The louver structure of the linear low refractive index hardened material 24.

Further, as shown in FIG. 4 (b), it is preferable that the high-refractive-index hardened product 22 and the low-refractive-index hardened product 24 each have a specific thickness, and they are maintained in a state of being arranged in parallel with each other in the vertical direction of the anisotropic light-diffusing film 20. .

The so-called high refractive index cured product is an ultraviolet cured product such as a (meth) acrylic acid ester monomer having a plurality of biphenyl rings. Although it is an example, the refractive index is preferably a value in the range of 1.5 to 1.65.

In addition, although a polymer such as a low-refractive index-based urethane (meth) acrylate is an example, its weight average molecular weight is preferably in the range of 3,000 to 20,000. It is preferably a value in the range of 1.4 to 1.5.

Thereby, when the incident angle is within the light diffusion incident angle region, the incident light is light-diffused by the anisotropic light-diffusing film 20 to show anisotropy.

That is, as shown in FIG. 4 (b), the incident angle of the incident light to the anisotropic light diffusion film 20 is an angle within a specific range substantially parallel to the interface 23 'of the shutter structure 23 (light diffusion incident angle) Angle in the region), the incident light (32, 34) is inside the high refractive index hardened material 22 in the shutter structure, and changes the direction while passing through the film thickness direction to make the light exit surface The direction of the side light becomes different.

As a result, when the incident angle is within the light diffusion incident angle region, the incident light (32 ', 34') is diffused by the anisotropic light diffusion film 20 only in a specific direction.

On the other hand, when the incident angle of the incident light (36 ') to the anisotropic light diffusing film 20 deviates from the light diffusing incident angle region, the incident light 36 is transmitted directly without being diffused by the anisotropic light diffusing film 20.

7. Light control member 2

In addition, as one of the light control members, an isotropic light diffusing film (for example, a column-type light diffusing film) that is different from the light diffusing layer is preferably laminated on the surface of the substrate (the side that is not in contact with the light diffusing layer).

That is, the isotropic light diffusing film is laminated on the surface of the substrate (the side not in contact with the light diffusing layer) through an adhesive or an adhesive, or the isotropic light diffusing film and the light diffusing layer are directly laminated instead of the substrate. Can make a composite projection screen. Accordingly, when the turbidity value is made low only by the light diffusion layer, the turbidity value can be controlled to a higher value as a whole due to the turbidity effect due to the isotropic light diffusing film.

In addition, if it is such a composite projection screen, when the external light is exposed and the performance is deteriorated, only the light diffusion layer is replaced. The columnar light diffusion film with relatively high cost also has the advantage of being reusable.

Also, although not shown, as the above-mentioned tubular light-diffusion film, for example, it has an interior having a relatively high refractive index in a region where the refractive index is relatively low and a plurality of columns having a relatively high refractive index are formed in the film thickness direction. Structured light diffusion film, etc.

More specifically, in a cross section cut in the vertical direction of the pillar-type light diffusing film, it is preferable that the pillars having a relatively high refractive index and the regions having a relatively low refractive index be alternately arranged with a specific width.

Accordingly, it is estimated that when the incident angle is in the region of the light diffusion incident angle, the incident light is diffused isotropically by the light diffusion film having a column structure in the film.

That is, the incident angle of the incident light to the light diffusion film having the column structure in the film becomes a value from the parallel to a specific angle range (value in the light diffusion incident angle region) with respect to the interface of the column structure.

Therefore, the incident light passes through the film thickness direction while changing the direction inside the relatively high refractive index pillars in the column structure, so that the traveling direction of the light on the light exit surface side is different.

As a result, when the incident angle is within the light diffusion incident angle region, the incident light is diffused into diffused light by the light diffusion film having a column structure in the film.

On the other hand, when the incident angle of the incident light to the light diffusing film having the column structure in the film deviates from the light diffusing incident angle region, the incident light directly passes through the light diffusing film without being diffused by the light diffusing film and becomes transmitted light.

8. Other laminated components

(1) Protective film

Further, it is preferable to protect the surface diffusion layer of the light diffusion layer of the screen from the surface area opposite to the substrate.

The reason is that by laminating the protective film in this way, the adhesion of pollutants to the light diffusion layer can be prevented, and the handling (portability) or adhesion of the screen or The effect of light diffusibility is reproducible.

Here, examples of protective films include polyolefin films such as polyethylene films, polypropylene films, polymethylpentene, polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. At least one of polyester films such as diesters, polyvinylidene fluoride films, polytetrafluoroethylene films, and silicone resin films.

The surface of the protective film on the side in contact with the light diffusion layer is preferably also subjected to a peeling treatment with a fluororesin or the like, and the film is preferably used without surface treatment.

The protective film thickness is preferably a value in the range of usually 1 to 1000 μm.

The reason is that if the protective film is too thin, handling properties may be deteriorated, and the function of protecting the light diffusion layer may be reduced. Further, when the protective film is too thick, handling becomes difficult in the same manner, and when it is attached to the light diffusion layer of the screen, it may become difficult to roll.

Therefore, the lower limit of the thickness of the protective film is more preferably 10 μm or more, and still more preferably 20 μm or more.

The upper limit of the thickness of the release film is more preferably 200 μm or less, and still more preferably 100 μm or less.

(2) Anti-reflection layer

Moreover, it is preferable to provide an anti-reflection layer on the screen than the light incident side of the projector.

Specifically, an antireflection layer (AR) or a low reflection layer is preferably provided. (LR) plastic film or moth-eye film.

The anti-reflection layer is different from the light diffusion control layer in that it does not have a function of selectively scattering only incident light from a specific angle range and transmitting incident light at an angle other than that.

The anti-reflection layer and the low-reflection layer may be formed by coating on a plastic film using a conventionally known material as the substrate. Moreover, it is also preferable to use a moth eye formed from a conventional method as a base material.

(3) Other

In addition, as long as the effect of the present invention is not impaired, a reinforcing plate, a hard coat layer, an antistatic layer, an ultraviolet absorbing layer, an ultraviolet reflecting layer, a hue adjusting layer, and a reflecting plate may be provided on at least one side of the substrate as needed. This function may be imparted to the substrate itself.

9. Manufacturing method

The screen of this embodiment can be made using the above-mentioned various materials, for example, as described below.

(1) Step 1

The first step is a step of preparing a coating liquid containing a silicone resin and organic fine particles.

Therefore, first, a certain amount of an organic solvent such as toluene or methyl ethyl ketone is contained in a container with a stirring device.

Secondly, put a certain amount of organic fine particles and use a stirring device in the container Stir in the device until uniformly dispersed.

Secondly, for the addition-molded organopolysiloxane composed of specific organopolysiloxane and organohydrogenpolysiloxane, a specific amount of platinum catalyst and a trifunctional or 4-functional siloxane may be included as desired. Each unit of polyorganosiloxane is stirred in a container using a stirring device until it becomes uniform.

Finally, while stirring in a container, a specific amount of an organic solvent such as toluene or methyl ethyl ketone is further added, and the solid content concentration is diluted to a specific value (for example, 20% by weight) to form a coating liquid.

(2) Step 2

The second step is a step of applying the obtained coating solution on a specific substrate and drying it.

That is, the obtained coating solution of the silicone resin solution is formed on the surface of the substrate using a coating device such as a blade coater or applicator, and further, a roll coater or the like.

Next, the coating film is heat-treated under specific conditions to disperse and dry an organic solvent (toluene, methyl ethyl ketone, etc.), and simultaneously react the polysiloxane resin component to form a specific light diffusion uniformly containing organic fine particles on the substrate. Floor.

As the heat treatment conditions at this time, although it varies with the type of silicone resin or the amount of catalyst added, it is usually preferably a heating temperature of 120 to 160 ° C and a heating time of about 0.5 to 10 minutes, more preferably a heating temperature. 125 ~ 140 ℃, heating time is about 1 ~ 5 minutes.

That is, after such coating, drying, and the like, An attached projection screen composed of a specific substrate and a specific light diffusion layer.

[Example]

Hereinafter, the attached projection screen (screen) of the present invention will be described in further detail with reference to the embodiments.

However, needless to say, the scope of the present invention is not limited by the description of the examples and the like without special reasons.

[Example 1]

1. Production of screen

In a container with a stirring device, as a polysiloxane resin, an organic polysiloxane composed of an organopolysiloxane having a vinyl group having a silicon-oxygen bond as a main skeleton and an organohydrogenpolysiloxane is formed. (Made by Shin-Etsu Chemical Industry Co., Ltd., KS-847H, refractive index: 1.43) 100 parts by weight (representing the solid content conversion value, the same below), containing platinum catalyst (Shin-Etsu Chemical Industry Co., Ltd., PL-50T) 0.03 Parts by weight, cross-linked polymethyl methacrylate (PMMA) particles (manufactured by Sekisui Chemical Industries, Ltd., SSX-104, average particle diameter: 4 μm, refractive index: 1.49).

Next, a specific amount of methyl ethyl ketone was added while stirring the polysilicone resin and the like contained in the container, and diluted to a solid content concentration of 20% by weight to prepare a coating solution.

Next, the obtained coating solution was applied to a PET film (LUMIROR U48, thickness: 125 μm, visible light transmittance: 89%) made of a PET film using a coater, and then applied to the treated surface side at 130 ° C. and 2 ° C. The heat treatment was performed for one minute to obtain a screen having a light diffusion layer having a thickness of 15 μm on one side of the substrate.

In addition, the thermal shrinkage of the PET film in the MD direction and the TD direction after being heated at 150 ° C. for 1 hour was 0.9% and 0.4%, respectively.

2. Evaluation of the screen

(1) Total light transmittance and turbidity

According to JIS K 7136: 2000, using NDH-5000 (Nippon Denshoku Industries Co., Ltd., integrating sphere light transmittance measuring device) as a turbidimeter, the screen is set so that the light diffusion layer side is the incident light side, Measure the haze value (haze,%) of the screen.

That is, using an integrating sphere-type light transmittance measuring device, the total light transmittance and diffuse transmittance of the screen are measured, and the turbidity values are calculated by the following formulas (2) and (3).

Haze value (%) = diffuse transmittance (%) / total light transmittance (%) × 100 (2)

Diffusion transmittance (%) = total light transmittance (%)-parallel light transmittance (%) (3)

(2) Adhesion

In accordance with JIS Z 0237: 2000, a tensile tester was used to measure the adhesion of the screen (width: 25 mm) to the glass plate (180 ° peeling force, peeling speed: 300 mm / min).

(3) Projection

The following criteria were used to evaluate the projection of the screen.

That is, the screen is cut into a 10 cm × 10 cm square, and it is attached to a glass plate to obtain a sample with the screen attached to the glass plate.

Next, a mini-projector PP-D1 (manufactured by ONKYO DIGITAL SOLUTION) was used to project a specific image from the substrate side of the screen onto the sample. At this time, the light radiated from the projector is irradiated such that the normal to the sample plane is incident at an angle of 30 ° downward.

Next, from the non-adhesive negative side of the screen of the glass plate, from the normal direction (0 °) of the sample plane or 30 ° downward (30 °) from the normal direction of the sample plane, visually observe the specific image, and use the following Benchmark evaluation.

In the following standards, the "bright environment" refers to an environment in which a fluorescent lamp is displayed in a room where the measuring device is oriented toward the fluorescent lamp and 800 lux is displayed when the measurement is performed, and 400 lux is displayed when the measurement is placed in the same manner as the sample. On the other hand, the so-called dark environment means a dark room state in which fluorescent lamps are turned off.

：: Very bright images were also seen in bright environments.

○: Vivid images are also seen in bright environments.

△: Although the image is not sharp in a bright environment, a sharp image is seen in a dark environment.

×: The image is not sharp in a dark environment.

(4) Attachability

The following criteria were used to evaluate the adherence of the screen.

That is, the screen was cut into a rectangular size of 6 cm in width and 14 cm in length, and the air removal state when it was attached to a glass plate was visually observed, and evaluation was performed according to the following criteria.

：: Even if you work by hand, you can easily extract air.

○: The extraction of air by hand is insufficient, but it can be easily extracted by using an extruder.

△: Air can be extracted by using an extruder.

×: Air extraction is difficult.

(5) Re-peelability

The following criteria were used to evaluate the re-peelability of the screen.

That is, after performing the above-mentioned evaluation of the screen attachability, it was peeled from the glass plate, the state of the screen including the light diffusion layer was visually observed, and the re-peelability of the screen was evaluated using the following criteria.

◎: It can be easily peeled from the glass plate by hand operation, the light diffusion layer is not deformed, and air is not mixed even if it is attached again.

○: It can be peeled from the glass plate by hand, the light diffusion layer is not deformed, and air is not mixed when it is reattached using an extruder.

△: Although it can be peeled from the glass plate, the light diffusion layer is deformed, and the air-removability after re-attachment is reduced.

×: The light diffusion layer could not be peeled from the glass plate, or the light diffusion layer was broken during the peeling, and a part of the light diffusion layer remained on the glass plate.

(6) Adhesion durability (thermal cycle test)

The following criteria were used to evaluate the adhesion durability of the screen.

That is, the screen is cut into a 10 cm × 10 cm square, and the light diffusion layer side is attached to a glass plate to obtain a screen with a screen attached to the glass plate. Product. Prepare 10 pieces of the same sample.

Next, for each of 10 samples, a thermal cycle test was repeatedly performed every 30 minutes at -35 ° C and 70 ° C for 250 hours, and then the samples were evaluated by the following criteria for adhesion durability evaluation. The results obtained are shown in Table 1.

：: Screen peeling was not observed in any of the 10 samples.

○: Screen peeling was observed in 1 to 2 of the 10 samples.

△: Screen peeling was observed in 3 to 5 of the 10 samples.

×: Screen peeling was seen in 6 to 10 of the 10 samples.

[Examples 2 to 4]

In Examples 2 to 4, the influence of the blending amount of the organic fine particles on the silicone resin was reviewed.

That is, in Example 2, the compounding amount of the organic fine particles was set to 10 parts by weight, in Example 3, the compounding amount of the organic fine particles was set to 15 parts by weight, and in Example 4, the compounding amount of the organic fine particles was set to Except for 1 part by weight, a screen was prepared in the same manner as in Example 1, and the turbidity value and the like were measured. The results obtained are shown in Table 1.

[Examples 5 to 6]

In Examples 5 to 6, the influence of the thickness of the light diffusion layer was reviewed.

That is, in Example 5, the thickness of the light diffusion layer was set to 10 μm, and in Example 6, the thickness of the light diffusion layer was set to other than 25 μm. In the same manner as in Example 1, a screen was prepared to measure the turbidity value and the like. The results obtained are shown in Table 1.

[Examples 7 to 9]

In Examples 7 to 9, the types (including the difference in average particle size) of the organic fine particles prepared in the silicone resin were reviewed.

That is, in Example 7, the type of the organic fine particles was PMMA particles (manufactured by Sekisui Chemical Industry Co., Ltd., SSX-104, average particle diameter: 4 μm, refractive index: 1.49), and PMMA particles (Sekisui Chemical Industry) Co., Ltd., SSX-102, average particle size: 2 μm, refractive index: 1.49). In Example 8, the type of organic fine particles was also set to PMMA particles (manufactured by Sekisui Chemical Industry Co., Ltd., SSX-108, average Particle size: 8 μm, refractive index: 1.49). In Example 9, the type of organic fine particles was also set to cross-linked polystyrene particles (SX-350, manufactured by Kenken Chemical Co., Ltd.). : 1.60), a screen was prepared in the same manner as in Example 1, and the turbidity value was measured. The results obtained are shown in Table 1.

[Example 10]

In Example 10, an attached composite projection screen was prepared by disposing a light control member having anisotropic light diffusivity between the substrate and the light diffusion layer, and the influence was reviewed.

That is, the anisotropic light diffusive film shown in FIG. 4 is prepared as a light control member having anisotropic light diffusivity.

The anisotropic light-diffusing film was prepared by the following procedure.

<Preparation of composition for anisotropic light-diffusing film>

In a container with a stirring device, polypropylene glycol, isophorone diisocyanate, and 2-hydroxyethyl methacrylate were reacted to obtain a polyether urethane methacrylate having a weight average molecular weight of 9,900 (at a wavelength of 589 nm). The refractive index is 1.46).

Next, to 100 parts by weight of the obtained polyetherurethane methacrylate, o-phenylphenoxyethoxyethyl acrylate (manufactured by Shin Nakamura Chemical Co., Ltd., NK ESTER ALEN-10) was added; Refractive index 1.58 at a wavelength of 589 nm) 100 parts by weight, 5 parts by weight of 2-hydroxy-2-methylphenylacetone as a photopolymerization initiator, and then mixed at 80 ° C until uniform to obtain anisotropic light diffusion Composition for flexible film.

<Coating of a composition for an anisotropic light-diffusing film>

Next, the obtained composition for an anisotropic light-diffusing film was applied to a PET film as a step sheet using an applicator to obtain a photocurable resin layer having a film thickness of 200 μm.

<Curing of Photocurable Resin Layer>

Next, the obtained laminated body composed of the PET film and the photocurable resin layer is set so that the PET film side is in contact with the conveyor belt, and above the photocurable resin layer, the ultraviolet rays of the built-in linear ultraviolet lamp are set. The irradiation device (made by EYEGRAPHICS (stock), ECS-4011GX) is installed so that an angle formed by the traveling direction of the conveyor belt and the length direction of the linear ultraviolet lamp becomes a right angle. In addition, the ultraviolet irradiation device is boxed so that the corresponding conveyor belt portion does not enter outside light, and The ultraviolet radiation emitted from the line irradiation device becomes slightly parallel in the traveling direction of the conveyor belt (the traveling direction of the photocurable resin layer). The width of the ultraviolet irradiation in the traveling direction of the photocurable resin layer is adjusted by two light-shielding plates. At this time, when the ultraviolet rays irradiated onto the surface of the photocurable resin layer are viewed from the longitudinal direction of the linear ultraviolet lamp, when the normal direction of the photocurable resin layer is set to 0 °, the direct ultraviolet irradiation angle from the lamp is set to 30. °. In addition, the ultraviolet lamp is arranged such that an angle formed by the longitudinal direction of the ultraviolet lamp and the longitudinal direction of the laminated body is a right angle.

Next, while the peak illuminance on the surface of the photocurable resin layer is 10 mW / cm ² and the accumulated light amount is 80 mJ / cm ^2, the ultraviolet light is irradiated in the air atmosphere, and the laminated body is conveyed in a lengthwise direction of 0.2 by a conveyor belt. m / min speed.

<Post-processing>

Next, a film (SP-PET382050, manufactured by Lintek Corporation) was peeled on the surface layer of the photocurable resin layer, and ultraviolet irradiation was performed under the same conditions as in the above steps.

Thereby, an anisotropic light-diffusing film having a total thickness of 200 μm, a cross-section-shaped hardened object with an inclination angle of 22 ° (the normal direction of the film plane is 0 °), and a thickness direction length of the louver structure of 165 μm was obtained. The total thickness was measured by a constant-pressure thickness measuring device (TECLOCK PG-02J, manufactured by Takara Seisakusho Co., Ltd.), and the inclination angle and length of the cross-section-shaped hardened material were measured based on an electron microscope photograph.

Next, peel the prepared anisotropic light diffusing film from its step sheet. The exposed surface was attached to the substrate side of the screen obtained in Example 2 with a commercially available acrylic adhesive, and an anisotropic light diffusing film, a substrate (PET film), and a light diffusing layer were sequentially laminated. The attached composite projection screen.

Next, various tests, such as a turbidity value, peeled the peeling film on the anisotropic light-diffusing film, and it measured similarly to Example 1.

However, for the projection evaluation of the screen, the angle of inclination between the light of the projector and the cross-section-shaped hardened object is the shallowest angle (the direction of ultraviolet irradiation when making an anisotropic light-diffusing film and the light irradiation of the projector The directions are slightly the same). Adjust the top, bottom, left, and right of the laminated body of screen and glass. The results obtained are shown in Table 1.

[Comparative Example 1]

In Comparative Example 1, organic fine particles were not prepared at all in the silicone resin of the light diffusion layer, that is, the blending amount was set to other than 0 parts by weight. As in Example 1, a screen was prepared to measure the turbidity value and the like. The results obtained are shown in Table 1.

[Comparative Example 2]

In Comparative Example 2, except that the amount of the organic fine particles of the polysiloxane resin in the light diffusion layer was set to 7 parts by weight, a screen was prepared in the same manner as in Example 1, and the turbidity value was measured. The results obtained are shown in Table 1.

[Comparative Example 3]

In Comparative Example 3, the type of the organic fine particles in the light diffusion layer is from SSX-104 It was changed to TOSPEARL 145 (manufactured by TORAY, average particle diameter: 4.5 μm, refractive index: 1.43), and the blending amount was set to other than 5 parts by weight. A screen was prepared in the same manner as in Example 1 to measure the turbidity value. The results obtained are shown in Table 1.

[Comparative Example 4]

In a container with a stirring device, 100 parts by weight of an acrylic copolymer containing 98.5% by weight of butyl acrylate and 1.5% by weight of 2-hydroxyethyl acrylate with an average molecular weight of 2 million, containing trimethylolpropane-modified xylene. 0.2 parts by weight of diisocyanate (manufactured by Kenken Chemical Co., Ltd., product name "TD-75"), 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Industry Co., Ltd., product name "KBM-403" ) 0.2 parts by weight and 3 parts by weight of PMMA particles (manufactured by Sekisui Chemical Industry Co., Ltd., SSX-104, average particle diameter: 4 μm, refractive index: 1.49), each was mixed in ethyl acetate to obtain a coating solution.

Next, the obtained coating liquid was applied to a PET film (made by TORAY, LUMIRROR U48, thickness: 125 μm) on the easy-to-be-treated surface side, followed by heat treatment at 90 ° C. for 1 minute, and then at room temperature. Health for 1 week. Thereby, a screen provided with a 15 μm-thick light diffusing layer made of acrylic resin on one side of the substrate was produced.

Next, as in Example 1, the turbidity value and the like of the obtained screen were measured. The results obtained are shown in Table 1.

[Comparative Example 5]

In Comparative Example 5, except that the type of the fine particles was changed from SSX-104 to TOSPEARL 145 (manufactured by TORAY, average particle diameter: 4.5 μm, refractive index: 1.43), and the amount of the fine particles was set to 4.45 parts by weight, based on In Comparative Example 4, a screen was created, and a turbidity value was measured. The results obtained are shown in Table 1.

[Table 1]

10‧‧‧ Attached Projection Screen (Screen)

12‧‧‧ substrate

14‧‧‧light diffusion layer

14a‧‧‧polysiloxane

14b‧‧‧Organic particles

16‧‧‧ release film

18‧‧‧ Adhered body (window glass or display cabinet, etc.)

20‧‧‧light control member (anisotropic light diffusing film)

21‧‧‧ Attached Composite Projection Screen

Claims (8)

An attached projection screen, which is characterized by comprising a substrate and a light diffusion layer. The light diffusion layer contains a polysiloxane resin and organic fine particles having an average particle diameter of 1 to 10 μm, so that the thickness of the light diffusion layer is 5 The value in the range of ~ 30 μm makes the 180 ° peel force measured in accordance with JIS Z 0237: 2009 on the light diffusion layer side a value in the range of 20 to 200 mN / 25 mm, and the turbidity measured in accordance with JIS K 7136: 2000. The value is 20% or more. For example, the attachment type projection screen of claim 1, wherein the amount of the organic fine particles to be formulated is in a range of 1 to 15 parts by weight relative to 100 parts by weight of the silicone resin. For example, the attachment type projection screen of claim 1 or 2, wherein the thickness of the light diffusion layer is t (μm), the average particle diameter of the organic fine particles is Φ (μm), and the prepared amount of the organic fine particles is A ( For parts by weight), the influence factor expressed by t / Φ × A is a value in the range of 3 to 100. The attached projection screen according to any one of claims 1 to 3, wherein the refractive index difference between the silicone resin and the organic fine particles is a value of 0.02 or more. The attached projection screen according to any one of claims 1 to 4 is a value in which the thickness of the aforementioned substrate is in a range of 50 to 250 μm. For example, the attached projection screen of any one of claims 1 to 5, which is the MD direction in which the thermal shrinkage of the aforementioned substrate is heated at 150 ° C for 1 hour. Both directions and the TD direction are values below 2%. For example, the attached projection screen of any one of claims 1 to 6, which is further provided with a light control member having anisotropic light diffusion or isotropic light diffusion on the surface and back of the aforementioned substrate or any one of them . The attached projection screen according to any one of claims 1 to 7, which has a protective film on the surface area layer of the light diffusion layer on the side opposite to the substrate.