KR20170112982A - Pasting projection screen - Google Patents

Abstract

INDUSTRIAL APPLICABILITY The present invention is to provide a transmissive screen which has sufficient transparency and is excellent in adhesion and durability to an adherend such as glass and is also excellent in re-peeling property, It is an object of the present invention to provide a screen which is free from deterioration of visibility due to incorporation of bubbles or the like even in reuse.
In order to solve the above problems, a patch-type projection screen comprises a substrate and a light-diffusing layer, and the light-diffusing layer comprises a silicone resin and organic fine particles having an average particle diameter of 1 to 10 mu m, And the 180 占 peeling force measured in accordance with JIS Z 0237: 2009 on the side of the light-diffusing layer is set to a value within a range of 20 to 200 mN / 25 mm, and further, , The haze value measured in accordance with JIS K 7136: 2000 is 20% or more.

Description

PASTING PROJECTION SCREEN

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a patch-type projection screen (hereinafter referred to simply as a screen) for enlarging and projecting an image irradiated from a projector, which is pasted to an adherend such as a window glass.

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

However, such a conventional projection screen generally has a small surface, while a screen to be viewed is dark, and furthermore, a moire shape is likely to occur in an image.

In the conventional projection screen, a black stripe is arranged on the focal plane of the lenticular lens to absorb part of the external light by the black stripe without attenuating the condensed projector light, thereby suppressing a decrease in contrast due to external light Is being taken.

However, in practice, a part of the external light is not absorbed in the black stripe but penetrates into the optical system, so that the reduction of the contrast is still a problem.

Therefore, a transmissive screen in a form of attaching to a transparent body such as a windowpane or the like and recognizing an image emitted from the projector to a viewer on the back side has been proposed (see, for example, Patent Document 1).

More specifically, as shown in Fig. 6, a transmissive screen (first transparent body) composed of a hard coat layer, a transparent body (first transparent body), a forward scattering light scattering layer, to be.

The forward scattering light scattering layer is formed by blending a predetermined amount of spherical fine particles having an average particle diameter of 1 to 10 占 퐉 in a transparent binder and the relative refractive index n of the spherical fine particles with respect to the refractive index of the transparent binder satisfies 0.91 & n < 1.09, and the haze value is preferably not less than 3% and the image clarity is not less than 60%.

Further, a rear projection system using a flexible transmissive screen having a high ambient light removal rate has also been proposed (for example, see Patent Document 2).

More specifically, the present invention relates to a projector comprising a step of providing a projector capable of presenting an image, a back surface for receiving light from the projector, a display portion on the opposite side to the back surface, A step of providing a flexible screen having a light absorbing layer that substantially impervious the screen under conditions, providing a peelable adhesive, selecting a substantially transparent surface at a viewable position, And a step of projecting an image from the projector to the rear side of the screen to provide information to a viewer. The rear projection system according to claim 1,

It is preferable to use a bead screen composed of a glass bead monolayer having an average particle diameter of more than about 20 mu m and less than 400 mu m, an opaque black base material, and a substrate made of polyvinyl chloride or the like as the flexible screen.

It is also preferred that the adhesive is a peelable adhesive having a peeling force of 0.5 to 2 pounds per inch (about 280 to 1100 mN / 25 mm) as a main component, such as a particulate acrylic pressure-sensitive adhesive, as an adhesive for sticking the screen onto a transparent surface have.

Japanese Patent Application Laid-Open No. 2007-34324 (claims) Japanese Patent Laid-Open No. 2004-533636 (claims, etc.)

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

Therefore, the front scattering light-scattering layer and the pressure-sensitive adhesive layer are separated from each other independently, and the transmissive screen becomes excessively thick, so that when a predetermined image is projected, blurring occurs in the image.

Further, since the forward scattering light scattering layer is sandwiched between the transparent body (first transparent body) and the transparent body (second transparent body), basically, the transmissive screen is attached to an adherend (glass plate or the like) And there is a problem that the usability is poor.

Also in the rear projection system using the flexible transmissive screen disclosed in Patent Document 2, a flexible screen including a bead screen or the like and a peelable adhesive layer are independently provided.

As a result, the entire transmissive screen becomes excessively thick, causing blurring of the image. In addition, although the adhesive layer can be peeled off, the durability of the adhesive property is lowered, and unintended peeling is feared.

In addition, the average particle diameter of the beads in the bead screen or the like is excessively large, which is not only difficult to use as a screen for projecting an image of a fixed size but also has a problem of poor light diffusibility.

That is, the present invention provides a transmissive screen having sufficient transparency, being excellent in adhesion to an adherend such as glass and durability thereof, and excellent in re-peeling property And to provide a screen free from deterioration of visibility due to mixing of bubbles or the like even in reuse after peeling off.

According to the present invention, there is provided a light-diffusing layer comprising a substrate and a light-diffusing layer, wherein the light-diffusing layer comprises a silicone resin and organic fine particles having an average particle diameter of 1 to 10 mu m, And the 180 占 peeling force measured in accordance with JIS Z 0237: 2009 on the light-diffusing layer side is set to a value within a range of 20 to 200 mN / 25 mm, and a value according to JIS K 7136: 2000 And a haze value measured by the projection optical system is set to a value of 20% or more. Thus, the above-described problems can be solved.

That is, the use of silicone resin as the subject of the light-diffusing layer and the use of organic fine particles having a predetermined average particle diameter (φ), and the thickness (t), the 180 ° peeling force and the haze value (The number of films is small) so that the blur of the image is not a problem, the projection performance as a screen is excellent, and adhesion can be performed without bubbles, It is possible to obtain a sticky projection screen which can be easily peeled off after use and can be stuck without bubbling even when reused.

Further, in constructing the adhesive type projection screen of the present invention, it is preferable that the compounding amount (A) of the organic fine particles is set to a value within a range of 1 to 15 parts by weight with respect to 100 parts by weight of the silicone resin.

By such a constitution, it is possible to stably obtain a predetermined haze value without excessively lowering the light transmittance (total light transmittance).

The thickness of the light-diffusing layer is t (占 퐉), the blending amount of the organic fine particles is A (parts by weight), and the average particle diameter of the organic fine particles is? (占 퐉) , It is preferable to set the influence factor represented by t 占 A /? To a value within a range of 3 to 100.

By setting the influence factor defined in this manner to a value within a predetermined range, it is possible to obtain a projected projection screen with a haze value or adhesion within a predetermined range to a much higher degree (accuracy) and stably.

Further, in constructing the stick-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 set to a value of 0.02 or more.

With this configuration, a predetermined haze value can be obtained more quantitatively and stably.

Further, in constructing the patch-type projection screen of the present invention, it is preferable that the thickness of the substrate is within a range of 50 to 250 mu m.

By such a constitution, even when the silicone resin is coated on the substrate and heated at a predetermined temperature (for example, 130 ° C or higher) during drying, the substrate exhibits a predetermined heat resistance and can maintain good smoothness, Further, it is possible to obtain a sticky projection screen having better light diffusibility and total light transmittance.

Further, in constructing the adhesive type projection screen of the present invention, it is preferable that the heat shrinkage ratio of the substrate is set to a value within a range of 2% or less in either the MD direction or the TD direction after heating for one hour at 150 캜.

By such a constitution, even when the silicone resin is coated on the substrate and heated for a predetermined time at a predetermined temperature (for example, 130 ° C or higher) during drying, the substrate exhibits a predetermined heat resistance and maintains good smoothness . From this point of view, the heat shrinkage ratio is more preferably 1.5% or less, and particularly preferably 1.0% or less.

Further, in constructing the stick-type projection screen of the present invention, it is preferable that a light control member having an anisotropic light diffusing property or an isotropic light diffusing property is further provided on the surface and / or the back surface of the substrate.

By such a constitution, it is possible to easily adjust to a desired haze value, to widen an angle at which a visual image can be viewed, or to increase the uniformity of light diffusion in a screen, A good and clear image can be visually recognized.

In constructing the adhesive type projection screen of the present invention, it is preferable that a protective film is laminated on the surface of the light diffusion layer opposite to the substrate.

By including the protective film in this way, it is possible to prevent dust from being stained as contamination on the surface of the light diffusion layer, and to improve the handling (transportability) of the patch-type projection screen, The reproducibility of the effect can be made better.

Figs. 1 (a) to 1 (d) are diagrams showing a configuration example of a patch-type projection screen or the like.
Fig. 2 (a) is a view showing the relationship between the average particle diameter of the organic fine particles, the haze value and the adhesion force in the patch-type projection screen, and Fig. 2 (b) FIG. 2C is a view showing the relationship between the film thickness of the light diffusion layer, the haze value and the adhesion force in the patch-type projection screen, respectively. FIG. 2C is a graph showing the relationship between the compounding amount, haze value, .
Fig. 3 is a diagram showing the relationship between the influence factor (t 占 A /?), The haze value and the adhesion force in the patch-type projection screen.
Figs. 4 (a) to 4 (b) are views for explaining an anisotropic light-diffusing film.
Fig. 5 is a view for explaining the relationship between the respective incident angles and the haze value in a pasted composite projection screen in which an anisotropic light-diffusing film is further laminated on the base side of the pasted projection screen .
6 is a view for explaining an aspect of a conventional light diffusion adhesive sheet.

An embodiment of the present invention is a light-diffusing layer comprising a base material and a light-diffusing layer, wherein the light-diffusing layer comprises a silicone resin and organic fine particles having an average particle diameter of 1 to 10 mu m, And the 180 占 peeling force measured in accordance with JIS Z 0237: 2009 on the light-diffusing layer side is set to a value within a range of 20 to 200 mN / 25 mm, and the value of JIS K 7136: 2000 Is set to a value of 20% or more.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a patch-type projection screen according to the present invention will be described in detail with reference to the accompanying drawings.

1. Adhesion of a sticky projection screen

The attaching projection screen according to the present embodiment has a 180 ° peeling force (peeling rate: 300 mm / min) (hereinafter, referred to as &quot; peeling strength &quot;) measured in accordance with JIS Z 0237: 2009 when the light diffusion layer side is attached to a glass plate ) Is adjusted within a range of 20 to 200 mN / 25 mm.

That is, since the adhesive force is 20 mN / 25 mm or more, it is possible to maintain the adhesive state with good durability even when the air conditioner, the heating, or the outside air temperature changes, and to perform the function as a screen. From this viewpoint, the adhesion is more preferably 30 mN / 25 mm or more, and more preferably 35 mN / 25 mm or more.

When the adhesion is 200 mN / 25 mm or less, it is possible to provide a screen excellent in bubble dropping at the time of application, and in the case where it is unnecessary, it can be easily peeled off. Further, even in the case of pasting again, the screen can be used as a screen excellent in bubble dropping property. Bubbles are noticeable as the screen becomes thinner, and more noticeable as the projection of the screen increases.

From this viewpoint, the adhesion is more preferably 100 mN / 25 mm or less, and particularly preferably 80 mN / 25 mm or less.

2. Haze value of attachable projection screen

The screen in the present embodiment is characterized in that the haze value measured in accordance with JIS K 7136: 2000 is 20% or more.

The haze value (haze value) of the screen is obtained by measuring the total light transmittance and the diffuse transmittance of the screen by using an integrated light transmittance measuring apparatus and by using the equations (2) and (3) Is the value to be obtained.

That is, since the haze value is 20% or more, the screen has transparency even under a bright environment. From such a viewpoint, the haze value is more preferably 50% or more, and particularly preferably 70% or more.

Although the upper limit of the haze value is not particularly limited, if the haze value is excessively large, the back scattering light increases and the total light transmittance may become insufficient. From such a viewpoint, the haze value is more preferably 99% or less, and more preferably 98% or less.

3. Basic configuration of attachable projection screen

1 (a), a sticky projection screen (hereinafter, simply referred to as a screen) 10 basically comprises a base material 12, a silicone resin 14a and organic fine particles 14b And a light diffusing layer 14 formed by blending the light diffusing layer 14 and the light diffusing layer 14.

1B, the protective film 16 is laminated on the surface of the light diffusing layer 14 on the side opposite to the substrate 12 in order to prevent adhesion of dust or the like from the surroundings before use, .

1 (c), after the protective film 16 on the surface is removed, the screen 10 is interposed between the light diffusion layers 14 to form a window glass or a showcase , And the like.

Therefore, the viewer can recognize the image irradiated from the projector as a dynamic image or character information formed by diffusing the image with a predetermined size through a sticky projection screen attached to a window glass, a showcase, or the like.

1 (c) and 1 (d), the light from the projector is normally incident on the base 12 side, but depending on the application, It is also possible that the light from the light source is incident.

Here, the base material which is a part of the screen exhibits a function as a support for the light diffusion layer, and improves handling, transportability, manufacturability, decorative property and the like as a screen, and also provides mechanical protection, ultraviolet shielding, It is desirable to have a function of giving a gender and the like.

Further, as will be described later, such a base material may function as a heat resistance holding member at the time of applying and drying a coating liquid containing a silicone resin and organic fine particles.

On the other hand, the light-diffusing layer basically has both functions of attaching to an adherend and diffusing light as a video image from the projector to improve the viewing angle characteristics.

In other words, there are a transmissive screen that observes from the side opposite to the projector with the screen therebetween, and a reflective screen that observes from the same side as the projector, and in the case of a transmissive screen, And diffuses the light while diffusing it, thereby recognizing the viewer on the rear side of the screen.

On the other hand, in the case of the reflection type screen, the light diffusion layer has a function of reflecting the image from the projector while diffusing it, and recognizing the image from the viewer on the projector side of the screen.

The screen according to the present invention can be used for either a transmissive screen or a reflective screen, but it is more preferably used as a transmissive screen from the viewpoint of maximizing the effect of the present invention.

4. Equipment

(1) Type

The type of the substrate is not particularly limited, but it is preferably a polyester film such as polyethylene terephthalate (hereinafter may be referred to as PET film), polybutylene terephthalate, and polyethylene naphthalate.

This is because such a polyester film is excellent in transparency, heat resistance, or mechanical strength, and is relatively inexpensive.

More specifically, even when the silicone resin is coated on the substrate and heated at a predetermined temperature (for example, 130 占 폚 or higher) during drying, since the substrate exhibits a predetermined heat resistance, good smoothness can be maintained, This is because an attachable projection screen having stable light diffusibility and light transmittance can be obtained.

Examples of the plastic film other than the polyester film include polyolefin films such as polyethylene films and polypropylene films, cellophane films, diacetylcellulose films, triacetylcellulose films, acetylcellulose butyrate films, polyvinyl chloride films, polyvinylidene chloride films , Polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyetheretherketone film, polyethersulfone film, polyetherimide film, fluororesin film, One or more kinds of combinations of polyamide film, acrylic resin film, polyurethane resin film, norbornene polymer film, cyclic olefin polymer film, cyclic conjugated diene polymer film, vinyl alicyclic hydrocarbon polymer film, Film.

In the substrate, particularly, the plastic film, the surface treatment such as the primer treatment, the oxidation method, and the roughening treatment (unevenness treatment) is preferably applied to one surface or both surfaces of the substrate in order to improve the adhesion with the light diffusion layer .

Here, examples of the oxidation method include a combination of one or more species such as corona discharge treatment, chromic acid treatment, flame treatment, silicate treatment, hot air treatment, ozone / ultraviolet ray treatment and the like.

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

The shape of the base and the like may be changed depending on the purpose and purpose, but it is also preferable to use a porous film having an opening, for example, an opening having a diameter of 0.1 to 10 mm. This is because the flexibility and handleability are improved and the present invention can be applied not only to a planar adherend but also to a curved adherend.

(2) Thickness

In addition, it is preferable that the thickness of the substrate is usually within a range of 50 to 250 mu m.

The reason for this is that when the thickness of the base is less than 50 탆, there is a case in which fine wavy needles are formed on the substrate by heating at the time of forming the light diffusion layer, thereby lowering the sharpness of the image on the screen.

On the other hand, when the thickness of the base exceeds 250 m, the fog of the image on the screen due to the thickness of the base is increased, and the sharpness of the image is sometimes lowered.

Therefore, the lower limit thickness of the substrate is more preferably 100 mu m or more, and more preferably 120 mu m or more.

Further, the upper limit thickness of the substrate is more preferably 220 탆 or less, and more preferably 190 탆 or less.

(3) Heat shrinkage

The heat shrinkage ratio of the base material can be measured in accordance with JIS K 7133: 1999, but it is preferably not more than 2% in any one of the MD direction and the TD direction after a target temperature of 150 캜 and a heating time of 1 hour .

The reason for this is that even when the silicone resin is coated on the base material and the base material is heated at a predetermined temperature for a predetermined time by defining the heat shrinkage ratio of the base material as described above, the base material exhibits a predetermined heat resistance, It is because.

However, if the heat shrinkage rate of the base material becomes excessively small, the usable base material may be excessively limited, the stretching heat treatment for adjusting the heat shrinkage may be complicated, and the manufacturing cost may be remarkably increased.

Accordingly, the lower limit of the heat shrinkage percentage of such a base material is more preferably 0.001% or more, and more preferably 0.01% or more.

The upper limit of the heat shrinkage percentage of such a base material is more preferably 1.5% or less, and more preferably 1.0% or less.

The MD direction means a longitudinal direction at the time of forming a base film, and the TD direction means a width direction at the time of forming a base film.

(4) Light transmittance (visible light transmittance)

The light transmittance of the base material is preferably 80% or more in the visible light region.

This is because the light absorption of the substrate is limited by limiting the light transmittance of the substrate as described above, and as a result, the viewer can recognize a clear bright image on the back side of the screen.

However, if the light transmittance of the base material becomes excessively high, the usable base material may be excessively limited, the stretching heat treatment for adjusting the light transmittance may be complicated, and the manufacturing cost may be remarkably increased.

Therefore, the lower limit of the light transmittance of the base material is more preferably 82% or more, and more preferably 85% or more.

The upper limit of the light transmittance of such a base material is more preferably 99.9% or less, and more preferably 99% or less.

5. Light diffusion layer

(1) Silicone resin

(1) -1 active ingredient

The light diffusion layer contains the silicone resin together with the organic fine particles, and the screen including the silicone resin can be attached to the adherend, re-peeled, and reused.

That is, the light-diffusing layer comprising such a silicone resin as a main component is characterized in that optical defects due to bubble entrainment do not occur due to sticking to the adherend while air is being extruded due to its adhesion.

This is an effect obtained even if the screen is hard. In other words, the screen can be installed on the spot by preventing the incorporation of bubbles by the light diffusion layer made of a silicone resin as a main component.

Further, the light-diffusing layer comprising a silicone resin as a main component can adhere to the adherend very firmly, and can peel off without leaving a paste.

In addition, the light-diffusing layer comprising a silicone resin as a main component is used at a portion closest to an adherend such as a windowpane, that is, the nearest portion to which external light is irradiated, but by using a silicone resin, the light-

Here, the silicone resin may contain, for example, an organopolysiloxane and / or a derivative thereof as a main component.

Particularly, as the main component, it is preferable to contain an addition type organopolysiloxane composed of an organopolysiloxane and an organohydrogenpolysiloxane having a siloxane bond as a main skeleton and an alkenyl group, and a silicone compound containing a platinum catalyst as a constituent component.

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

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

(In the formula (1), R 1 is an unsubstituted or substituted monovalent hydrocarbon group of 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, and a is 1.5 to 2.8, preferably 1.8 to 2.5, More preferably in the range of 1.95 to 2.05)

Examples of the unsubstituted or substituted monovalent hydrocarbon group bonded to the silicon atom represented by R 1 include a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, a hexenyl group, a cyclohexenyl group , An alkenyl group such as an octenyl group, an alkenyl group such as a methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, cyclohexyl group, , An aryl group such as a phenyl group, a tolyl group, a xylyl group, and a naphthyl group, an aralkyl group such as a benzyl group, a phenylethyl group and a phenylpropyl group, or a group in which some or all of the hydrogen atoms of these groups are substituted with fluorine, bromine , A halogen atom such as chlorine, a cyano group and the like, and examples thereof include a chloromethyl group, a chloropropyl group, a bromoethyl group, a trifluoropropyl group and a cyanoethyl group.

As the alkenyl group in the organopolysiloxane, a vinyl group is preferable because of a short curing time and productivity.

The organohydrogenpolysiloxane can be cured by addition reaction with an alkenyl group of an organopolysiloxane having a SiH group in its molecule and a siloxane bond as a main skeleton and having an alkenyl group.

(1) -2 Platinum catalyst

Examples of the platinum catalyst for curing the silicone resin include platinum black, platinum chloride, chloroplatinic acid, a reaction product of chloroplatinic acid with a monohydric alcohol, a complex of chloroplatinic acid with olefins, platinum bisacetoacetate and the like have.

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

This is because if the amount of the platinum catalyst is less than 0.01 part by weight, re-peeling properties may be deteriorated due to insufficient curing.

On the other hand, when the amount of the platinum catalyst is more than 3.0 parts by weight, the sticking property is deteriorated, gelation by the addition reaction is rapid, and stable application work becomes difficult.

Therefore, the lower limit of the amount of the platinum catalyst used is more preferably 0.05 part by weight or more, and more preferably 0.1 part by weight or more.

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

(1) -3 Other polyorganosiloxane

Further, it is also preferable to add a polyorganosiloxane containing a trifunctional or tetrafunctional siloxane unit in the molecule to the addition-type organopolysiloxane as the main component in order to further increase the adhesion.

When such a polyorganosiloxane is blended, the blending amount thereof is preferably 50 parts by weight or less based on 100 parts by weight of the addition-type organopolysiloxane.

The reason for this is that if the blending amount of the polyorganosiloxane exceeds 50 parts by weight, the adhesion increases and the re-peeling may become difficult.

However, if the blending amount of such a polyorganosiloxane is excessively decreased, the effect of addition may not be exhibited.

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

The upper limit of the blending amount of the polyorganosiloxane is more preferably 30 parts by weight or less, and more preferably 20 parts by weight or less.

Further, known additives such as a reaction retarder, an antioxidant, and an antistatic agent can be appropriately added to the silicone resin as other components than the above-mentioned components.

When these additives are added, it is preferable to adjust the amount of the additive to a value within a range of 0.01 to 10 parts by weight based on 100 parts by weight of the addition type organopolysiloxane, depending on the kind of the additive.

(1) -4 Refractive index

Further, it is preferable to set the refractive index of the silicone resin to a value within a range of 1.35 to 1.48.

This is because when the refractive index of the silicone resin exceeds 1.48, the haze value obtained may become excessively small in relation to the refractive index of the organic fine particles.

On the other hand, when the refractive index of the silicone resin is less than 1.35, the kind of the monomer used for obtaining a suitable silicone resin may be excessively limited.

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

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

(2) Organic fine particles

(2) -1 average particle diameter

Further, the average particle diameter of the organic fine particles is set to a value within a range of 1 to 10 mu m.

This is because when the average particle diameter of the organic fine particles is less than 1 탆, the haze value in the light-diffusing layer sharply drops, or aggregation tends to occur, making it difficult to uniformly disperse and mix It is because.

On the other hand, when the average particle diameter of the organic fine particles exceeds 10 탆, the adhesion of the light diffusion layer sharply drops or is difficult to aggregate, but it may be difficult to uniformly disperse and mix .

In other words, if the average particle diameter of the organic fine particles is such that txA / phi as an influence factor to be described later can be easily controlled to a value within a predetermined range, and moreover, the haze value and the adhesion force in a predetermined range can be controlled more stably It can be obtained quantitatively.

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

The upper limit of the average particle size of the organic fine particles is more preferably 8 占 퐉 or less, and more preferably 6 占 퐉 or less.

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

Here, the influence of the average particle size of the organic fine particles on the haze value (characteristic curve A) and the adhesion force (characteristic curve B) of the light-diffusing layer (which may be the same as the screen) is described with reference to Fig. 2 .

2 (a), the average particle diameter (占 퐉) of the organic fine particles is adopted, and the haze value (%) is used as the left ordinate and the adhesion force (mN / 25 mm ).

As understood from the behavior of the characteristic curve A in Fig. 2 (a), the haze value tends to increase slightly as the average particle diameter of the organic fine particles increases from 2 m to 10 m, and more specifically, , From about 52% to about 63%.

Further, as understood from the behavior of the characteristic curve B, the adhesion force tends to decrease slightly as the average particle diameter of the organic fine particles similarly increases. More specifically, from about 54 mN / 25 mm to about 49 mN / 25 mm .

Therefore, although the average particle diameter of the organic fine particles is not so strong, it has a predetermined influence on the haze value and adhesion of the light-diffusing layer. Therefore, when these numerical values are slightly adjusted, they are effective influences.

(2) -2 category 1

The kind of the organic fine particles (monomer species) is not particularly limited as long as a difference in refractive index, for example, a difference of 0.02 or more between the silicone resin and the silicone resin is obtained and a predetermined haze value can be obtained. The (meth) acrylic acid ester (Meth) acrylic acid resin derived from a monomer such as acrylic acid, (meth) acrylic acid, acrylamide or diol compound.

This is because, when the organic fine particles are made into silicone resin particles or silica particles, the difference in refractive index between the silicone resin and the silicone resin becomes excessively small, for example, becomes a value of less than 0.02, and the obtained haze value becomes remarkably small to be.

In other words, it is preferable that the kind of the organic fine particles is selected and the refractive index difference with respect to the silicone resin is set to a value of 0.02 or more, and a value of 0.05 or more is particularly preferable.

Other types of organic fine particles are also known, such as polycarbonate resins and polyester resins, because these condensation polymers tend to be easily hydrolyzed and durability and light transmittance are remarkably lowered.

(Meth) acrylate, octyl (meth) acrylate, isobutyl (meth) acrylate, isobutyl (meth) acrylate, (Meth) acrylic acid resin derived from at least one of monomers such as methyl (meth) acrylate, ethylhexyl, and (meth) acrylate dodecyl.

(2) -3 type 2

Further, regarding the type 2 (cross-linking agent) of the organic fine particles, since the durability, the mechanical strength, the glass transition temperature, the light resistance and the like of the organic fine particles are improved, a crosslinking agent such as divinylbenzene is added to the monomer It is preferable to blend in a fixed amount, and then polymerize the organic fine particles.

That is, a crosslinking agent is added so as to be in the range of usually 0.1 to 10% by weight based on the total amount of the monomer (100% by weight), and then solution polymerization or titrimetric polymerization is carried out to obtain a crosslinked It is preferable to use fine particles.

(2) -4 Refractive index

The refractive index of the organic fine particles is preferably determined in consideration of the difference in the refractive index with respect to the silicone resin, but is preferably within the range of 1.42 to 1.65.

This is because if the refractive index of such organic fine particles is less than 1.42, the haze value obtained may become excessively small in relation to the refractive index of the silicone resin. In addition, there are cases where the kind of the monomer used for obtaining suitable organic fine particles is excessively limited, or the production cost of the organic fine particles is increased.

On the other hand, when the refractive index of the organic fine particles exceeds 1.65, the types of the monomers used for obtaining suitable organic fine particles may be excessively limited or the manufacturing cost of the organic fine particles may be increased.

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

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

(2) -5 Amount

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

This is because when the blending amount of the organic fine particles is less than 1 part by weight, the haze value of the light-diffusing layer may drop sharply.

On the other hand, when the compounding amount of the organic fine particles exceeds 15 parts by weight, the adhesion of the light diffusion layer may drop sharply.

In other words, the blending amount of such organic fine particles makes it possible to easily control t × A / φ as an influence factor to be described later to a value within a predetermined range, and moreover, to control the haze value and the adhesion force in a predetermined range more stably and quantitatively .

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

The upper limit of the blending amount of the organic fine particles is more preferably 13 parts by weight or less, and more preferably 12 parts by weight or less.

Here, referring to Fig. 2 (b), the influence of the blending amount of the organic fine particles on the haze value (characteristic curve A) and the adhesion force (characteristic curve B) of the light diffusing layer (which may be the same as the screen) will be described.

2 (b), the blending amount (weight part) of the organic fine particles with respect to 100 parts by weight of the silicone resin is adopted, and the left vertical axis is shown by adopting the haze value (%) and the right vertical axis , And adhesion (mN / 25 mm).

As understood from the behavior of the characteristic curve A in Fig. 2 (b), the haze value tends to remarkably increase as the compounding amount of the organic fine particles increases from 1 part by weight to 17 parts by weight, and more specifically, Is increased from about 24% to about 98%.

Further, as understood from the behavior of the characteristic curve B, the adhesion force tends to gradually decrease as the blending amount of the organic fine particles similarly increases. More specifically, 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 haze value and the adhesion force of the light diffusion layer, and therefore, when the numerical values are largely changed, they can be said to be effective influences.

(3) Thickness

And the thickness of the light diffusion layer is set to a value within a range of 5 to 30 占 퐉.

This is because if the thickness of such a light diffusing layer is less than 5 占 퐉, not only a desired adhesion force and holding force are difficult to obtain but also the haze value is excessively lowered.

On the other hand, if the thickness of the light-diffusing layer exceeds 30 탆, the curing time becomes long, which is economically disadvantageous, and the optical characteristics of the substrate and the like may deteriorate.

Therefore, the lower limit of the thickness of the light-diffusing layer is more preferably 8 mu m or more, and more preferably 10 mu m or more.

The upper limit of the thickness of the light-diffusing layer is more preferably 25 m or less, and more preferably 20 m or less.

Here, referring to Fig. 2 (c), the influence of the thickness of such a light diffusion layer on the haze value (characteristic curve A) and the adhesion force (characteristic curve B) of the light diffusion layer .

2 (c), the thickness (占 퐉) of the light-diffusing layer is adopted and the haze value (%) is used for the left vertical axis and the adhesion force (mN / ).

As can be understood from the behavior of the characteristic curve A in Fig. 2 (c), the haze value tends to increase as the thickness of the light-diffusing layer increases from 10 m to 25 m, and more specifically, , From about 41% to about 72%.

As can be understood from the behavior of the characteristic curve B, as the film thickness of the light diffusion layer also becomes thicker, the adhesion tends to gradually increase. More specifically, from about 55 mN / 25 mm to about 65 mN / 25 Mm.

Therefore, since the film thickness of the light-diffusing layer has a strong influence on the haze value of the light-diffusing layer, it can be said that the influence is effective when the numerical value is greatly changed.

The film thickness of the light-diffusing layer affects the adhesion of the light-diffusing layer to some extent, and therefore, even if the numerical value is intended to be changed into a subtle range, it can be considered to be an effective influence.

(4) Influential factors

(T) is the thickness of the light-diffusing layer, t (占 퐉), the blending amount of the organic fine particles contained therein is A (parts by weight), and the average particle diameter of the organic fine particles is? it is preferable that the influence factor indicated by? is set to a value within the range of 3 to 100.

The reason for this is that by controlling the influence factors in such a range, it is possible to more easily and stably obtain a sticky projection screen having a haze value or adhesion within a desired range.

Therefore, it is more preferable to set the lower limit of the influence factor represented by t 占 A /? To 10 or more, more preferably 30 or more.

Further, the upper limit of the influence factor expressed by t 占 A /? Is more preferably 80 or less, and more preferably 60 or less.

Here, referring to FIG. 3, the influence of the influence factor expressed by t 占 A /? On the haze value and the adhesion force of the light diffusing layer (which may be the same as the screen) will be described.

3, the value (-) of the influence factor expressed by txA / phi in the light diffusion layer is adopted, and the haze value (%) is used for the left vertical axis, (MN / 25 mm) as the vertical axis.

As understood from the behavior of the characteristic curve A in Fig. 3, the haze value tends to remarkably increase as the value of txA /? Increases.

More specifically, when t 占 A /? Is 5, the haze value is as low as about 20%, but when t 占 A /? Is 10, the haze value is increased to about 40%. When t x A / phi is 20, the haze value is about 80%, and when it is 50 or more, the haze value is about 95%, and it tends to saturate.

On the other hand, as understood from the behavior of the characteristic curve B, as the value of t x A /? In the light diffusion layer increases, the adhesion tends to gradually decrease.

More specifically, when t 占 A /? Is 5 to 25, the adhesion is within a range of about 50 to 60 mN / 25 mm. When t 占 A /? Is 30, the adhesion is less than about 50 mN / 25 mm As shown in FIG. Further, when t x A /? Is 40, the adhesion force decreases to about 40 mN / 25 mm, and when it exceeds 60, the adhesion tends to be less than about 20 mN / 25 mm.

Therefore, txA / phi in the light-diffusing layer has a strong influence on the haze value, and therefore, it is possible to say that this value is largely influenced when the control value is changed.

Further, txA / phi in the light-diffusing layer affects the adhesion force as well, and therefore, it can be said that the influence is effective when the numerical value is changed into a subtle range and controlled.

6. Light control member 1

(For example, a louver type light diffusion film) 20 shown in Figs. 4 (a) to 4 (b) as a kind of light control member is formed on the surface (side not having a light diffusion layer) , It is preferable to further laminate.

More specifically, as shown in Fig. 1 (d), an anisotropic light-diffusing film 20 is laminated on the surface side (light incidence side) of the light diffusion layer 14 indirectly through the base material 12 Type composite projection screen 21 made of a transparent synthetic resin or the like, or directly stacked without interposing a substrate.

When an anisotropic light-diffusing film is directly laminated without interposing a substrate, the film functions as a substrate.

Further, usually, an adhesive layer or a pressure-sensitive adhesive layer is formed between the anisotropic light-diffusing film 20 and the base material 12, whereby it is preferable to adhere them.

That is, as shown in the characteristic curve A in Fig. 5, when the anisotropic light-diffusing film is used alone as a screen, it is known that the profile showing the haze value changes relatively steeply depending on the incident angle.

Thus, by providing a composite projection screen in which an anisotropic light diffusing property and an isotropic light diffusing property are combined, an anisotropic light diffusing film is laminated on the side of the light diffusion layer of the projector on which light is incident, , And the profile representing the haze value can be made more gentle.

Therefore, according to the composite projection screen in which the change in the haze value is made moderate as described above, the viewing angle characteristic (light diffusion angle of incidence angle) can be obtained regardless of the angle at which the viewer perceives the image or the angle of incidence of light from the projector to the screen And a relatively large number of viewers can see a good and clear image from the back side of the screen.

Further, even in the case of a composite projection screen in which an anisotropic light-diffusing film and a light-diffusing layer are combined, even if the performance deteriorates due to exposure to external light, only the light-diffusing layer can be replaced and an anisotropic light-diffusing film having a relatively high cost can be reused There is also an advantage.

With such a composite projection screen, even if the haze value is still low in the light diffusion layer alone, the haze value can be controlled to a higher value in total by the haze effect caused by the anisotropic light diffusing film.

4 (a) is a top view (plan view) of an anisotropic light-diffusing film 20, and Fig. 4 (b) Light-diffusing film 20 in a direction perpendicular to the dotted line AA, and the cut surface is viewed in the direction of the arrow.

As shown in Fig. 4 (a), the anisotropic light-diffusing film 20 has a line-shaped high refractive index cured product 22 having a relatively high refractive index and a low refractive index cured product 22 having a relatively low refractive index , And the low refractive index cured material 24 on the line are alternately arranged in parallel.

4 (b), the high refractive index cured article 22 and the low refractive index cured article 24 each have a predetermined thickness and are arranged in the vertical direction of the anisotropic light diffusing film 20 , It is preferable that they remain in a state of being arranged in an alternating manner.

The high refractive index cured product is, for example, an ultraviolet cured product of a (meth) acrylic acid ester monomer having a plurality of biphenyl rings, but preferably has a refractive index within a range of 1.5 to 1.65.

The cured product having a low refractive index is, for example, a polymer such as urethane (meth) acrylate. The weight average molecular weight is preferably within a range of 3,000 to 20,000, and the refractive index is preferably within a range of 1.4 to 1.5 Is preferably set to a value within the range.

Thus, when the incident angle is within the light diffusion angle of incidence angle range, the incident light is optically diffused by the anisotropic light-diffusing film 20 to exhibit anisotropy.

4 (b), the incident angle of the incident light to the anisotropic light-diffusing film 20 is within a predetermined range that is substantially parallel to the interface 23 'of the louver structure 23 Incident light 32 and 34 pass through the inside of the high refractive index cured product 22 in the louver structure along the film thickness direction while changing the direction, The traveling direction of the light on the side of the light source is not uniform.

As a result, when the incident angle is within the range of the light diffusion angle of incidence, incident light 32 ', 34' is diffused only in a predetermined direction by the anisotropic light-diffusing film 20.

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 range, the incident light 36 is not optically diffused by the anisotropic light- And is transmitted as it is.

7. Light control member 2

As a kind of light control member, the light-diffusing layer is formed by further laminating an isotropic light-diffusing film (for example, a columnar light-diffusing film) on the surface of the substrate (on the side not in contact with the light- .

That is, by laminating an isotropic light-diffusing film on the surface of the substrate (on the side not in contact with the light-diffusing layer) with an adhesive or a pressure-sensitive adhesive, or by laminating an isotropic light- A composite projection screen can be obtained. This is because even if the haze value is relatively low only in the light-diffusing layer, the haze value can be controlled to a higher value with the haze effect caused by the isotropic light-diffusing film as a total.

In addition, in the case of such a composite projection screen, there is an advantage in that, in the case where the performance is deteriorated due to a large exposure to the external light, only the light diffusion layer can be replaced and the column type light diffusion film having a relatively high cost can be reused.

Although not shown in the drawings, the above-mentioned column-shaped light-diffusing film is preferably a light-diffusing film having an internal structure formed by embedding a plurality of columnar materials having a relatively high refractive index in a film thickness direction in a region having a relatively low refractive index Film and the like.

More specifically, in the cross section cut in the vertical direction of the columnar light diffusion film, the columnar material having a relatively high refractive index and the region having a relatively low refractive index are alternately arranged with a predetermined width .

As a result, it is assumed that when the incident angle is within the light diffusion angle of incidence, the incident light is isotropically diffused by the light diffusion film having a columnar structure in the film.

That is, it is assumed that the incident angle of the incident light to the light diffusion film having the columnar structure in the film is a value within a predetermined angular range (value in the light diffusion incident angle range) from parallel to the boundary surface of the column structure.

Such incident light passes through the inside of the columnar body having a relatively high refractive index in the columnar structure along the film thickness direction while changing the direction so that the traveling direction of the light at the light-exiting-surface side becomes uneven.

As a result, when the incident angle is within the light diffusion angle of incidence, incident light is diffused by the light diffusion film having a columnar structure in the film, and becomes diffused light.

On the other hand, when the incident angle of the incident light to the light diffusing film having a columnar structure in the film deviates from the light diffusing incident angle range, the incident light is not diffused by the light diffusing film, do.

8. Other lamination members

(1) Protective film

It is also preferable that a protective film is laminated on the surface of the light diffusion layer on the screen opposite to the substrate.

This is because by laminating the protective film in this way, adhesion of contaminants to the light-diffusing layer can be prevented and the reproducibility of the handling (transportability) of the screen and the effect of adhesion and light diffusion can be improved Because.

Examples of the protective film include polyolefin films such as polyethylene films, polypropylene films and polymethylpentene, polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyvinylidene fluoride films, polytetrafluoroethylene An ethylene film, a silicone resin film, and the like.

It is also preferable that the side of the protective film in contact with the light-diffusing layer is peeled off with a fluororesin or the like, and the film is preferably used without being subjected to the surface treatment.

The thickness of the protective film is preferably in the range of usually 1 to 1000 mu m.

The reason for this is that if the protective film is excessively thin, the handling property may deteriorate or the function of protecting the light diffusion layer may deteriorate. Also, if the protective film becomes excessively thick, it becomes difficult to handle it, or when the protective film adheres 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 mu m or more, and more preferably 20 mu m or more.

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

(2) Antireflection layer

It is preferable that the antireflection layer is provided on the incident side of the light of the projector on the screen.

Specifically, it is preferable to provide a plastic film coated with the antireflection layer (AR) or the low reflection layer (LR), or a Moshei film.

The antireflection layer differs from the optical diffusion control layer in that it does not have a function of selectively scattering only incident light from a specific angular range and transmitting incident light at other angles.

The antireflection layer and the low reflection layer may be formed by coating a conventionally known material on the above-described plastic film as the base material. It is also preferable to use a Moshei film formed by a conventional prescription as a substrate.

(3) Other

The reinforcing plate, the hard coat layer, the antistatic layer, the ultraviolet absorbing layer, the ultraviolet reflecting layer, the color adjusting layer, the reflector, and the like may be provided on at least one side of the base material And the function itself may be imparted to the substrate itself.

9. Manufacturing Method

The screen according to the present embodiment can be manufactured, for example, as follows using various materials described above.

(1) First step

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

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

Subsequently, a predetermined amount of the organic fine particles is added, and the inside of the vessel is stirred using an agitating apparatus until homogeneously dispersed.

Subsequently, with respect to the addition type organopolysiloxane comprising the desired organopolysiloxane and the organohydrogenpolysiloxane, a predetermined amount of a platinum catalyst and, if desired, a polyorganosiloxane containing a trifunctional or tetrafunctional siloxane unit And the inside of the vessel is stirred using an agitator until the vessel becomes uniform.

Finally, a predetermined amount of an organic solvent such as toluene or methyl ethyl ketone is further added while stirring the inside of the container, and the organic solvent is diluted to have a solid content concentration of a predetermined value (for example, 20 wt%).

(2) Second step

The second step is a step of coating the obtained coating liquid on a predetermined substrate and drying it.

That is, a coating film is formed on the surface of the base material by using a coating device such as a knife coater or an applicator, or a roll coater or the like.

Subsequently, the coating film is heat-treated under predetermined conditions, the organic solvent (such as toluene or methyl ethyl ketone) is scattered and dried, and the silicone resin component is reacted to form a predetermined light diffusion layer .

The heat treatment conditions at this time vary depending on the kind of the silicone resin and the amount of the catalyst added, but the heating temperature is preferably 120 to 160 ° C and the heating time is preferably 0.5 to 10 minutes, It is more preferable that the heating time is about 1 to 5 minutes.

That is, the application type projection screen can be basically composed of a predetermined substrate and a predetermined light diffusion layer through coating and drying processing as described above.

[Example]

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

Needless to say, the scope of the present invention is not limited by the descriptions of the embodiments and the like without any particular reason.

[Example 1]

1. Screen production

(Shin-Etsu Chemical Co., Ltd., KS-847H, manufactured by Shin-Etsu Chemical Co., Ltd.) as a silicone resin and having a siloxane bond as a main skeleton and an organopolysiloxane having a vinyl group and an organohydrogenpolysiloxane , 0.03 part by weight of a platinum catalyst (PL-50T, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts by weight of crosslinked polymethyl methacrylate (PMMA ) Particles (SSX-104, average particle diameter: 4 탆, refractive index: 1.49, manufactured by Sekisui Chemical Co., Ltd.).

Subsequently, a predetermined amount of methyl ethyl ketone was further added while stirring the silicone resin or the like as a blending component in the container, and the mixture was diluted to a solid content concentration of 20% by weight to obtain a coating solution.

Subsequently, the obtained coating liquid was applied to the side of the adhesion (easy adhesion) treated surface of a PET film (Lumirra U48, thickness: 125 μm, visible light transmittance: 89%) using an applicator, A heat treatment at 130 占 폚 for 2 minutes was carried out to obtain a screen having a light diffusion layer having a thickness of 15 占 퐉 on one side of the substrate.

The heat shrinkage of the PET film in the MD and TD directions after heating at 150 ° C for 1 hour was 0.9% and 0.4%, respectively.

2. Evaluation of screen

(1) Total light transmittance and haze value

A screen was provided so that the side of the light diffusion layer was on the side of the incident light by using NDH-5000 (manufactured by Nihon Denshoku Kogyo Co., Ltd., integrated light transmittance measurement apparatus) as a haze meter in accordance with JIS K 7136: 2000, (Litter,%) was measured.

That is, the total light transmittance and the diffusion transmittance of the screen were measured by using an integrated old-fashion light transmittance measuring apparatus, and haze values were 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

(180 占 peeling force, peeling rate: 300 mm / min) of a screen (width: 25 mm) against a glass plate was measured using a tensile tester in accordance with JIS Z 0237: 2000.

(3) Translucency

The transparency of the screen was evaluated according to the following criteria.

That is, the screen was cut into a square of 10 cm x 10 cm and attached to a glass plate to obtain a sample on which a screen was pasted on a glass plate.

Subsequently, a predetermined image was projected onto the sample from the substrate side of the screen using a mini projector PP-D1 (manufactured by Ongyo Digital Solutions Co., Ltd.). At this time, the light beam irradiated from the projector was irradiated so as to be incident at an angle of 30 ° downward with respect to the normal line of the sample plane.

Then, a predetermined image is visually observed from the normal direction (0 DEG) of the sample plane from the side of the screen plane of the glass plate or from the direction (30 DEG) of 30 DEG downward in the normal direction of the sample plane, And evaluated according to the following criteria.

The bright environment in the following criterion refers to the environment in which the measuring instrument is measured in the direction of the fluorescent lamp at the sample position in the room where the fluorescent lamp is turned on and 800 lux is measured in the same manner as the sample. On the other hand, the dark environment refers to a dark room where a fluorescent lamp is put on.

◎: Image looks very clear even in bright environment

○: Image appears clearly even in bright environment

△: The image is unclear under a bright environment, but the dark environment and the high surface are clearly visible

X: The image is unclear even in a dark environment

(4) sticky castle

The sticking property of the screen was evaluated according to the following criteria.

That is, the screen was cut into a rectangle size of 6 cm in side length and 14 cm in length, and the state of air dropping when it was attached to the glass plate was visually observed and evaluated according to the following criteria.

◎: Even if manual operation is possible, air can be easily released.

∘: Air dropout is insufficient in manual operation, but air dropout is possible simply by using squeegee

△: By using a squeegee, air can be dropped.

X: Difficulty in air release

(5) Repeatability

The re-peelability of the screen was evaluated according to the following criteria.

That is, after the above-described screen adhesion evaluation was carried out, the film was peeled off from the glass plate, the state of the screen including the light diffusion layer was visually observed, and the re-peelability was evaluated according to the following criteria.

&Amp; cir &amp;: It can be peeled off from the glass plate simply by hand, no deformation of the light diffusion layer,

?: Can be manually peeled off from the glass plate, and there is no deformation of the light-diffusing layer;

?: Can be peeled off from the glass plate, but the light diffusing layer is deformed, and the air-leaking property after the application is lowered

X: can not be peeled from the glass plate, or the light diffusion layer is broken at the time of peeling, and a part of the light diffusion layer is left on the glass plate

(6) Adherence durability (heat cycle test)

The adhesion durability of the screen was evaluated according to the following criteria.

That is, the screen was cut into a square of 10 cm x 10 cm, and the side of the light diffusion layer was attached to a glass plate to obtain a sample having a screen attached onto a glass plate. Samples were prepared in a similar manner.

Subsequently, each of the 10 samples was subjected to a heat cycle test in which samples were alternately repeated at -35 占 폚 and 70 占 폚 for 30 minutes each for a period of 250 hours. Then, the samples were evaluated according to the following criteria, did. The obtained results are shown in Table 1.

◎: Peeling of the screen was not observed in 10 samples

○: Peeling of the screen was observed in one or two samples

?: Peeling of the screen was observed in 3 to 5 samples

×: Peeling of the screen was observed in 6 to 10 samples

[Examples 2 to 4]

The influence of the blending amount of the organic fine particles on the silicone resin was examined in Examples 2 to 4.

That is, in Example 2, the blending amount of the organic fine particles was 10 parts by weight, the blending amount of the organic fine particles was 15 parts by weight in Example 3, the blending amount of the organic fine particles was 1 part by weight , A screen was prepared in the same manner as in Example 1, and the haze value and the like were measured. The obtained results 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 examined.

That is, in Example 5, a screen was formed in the same manner as in Example 1 except that the thickness of the light-diffusing layer was 10 占 퐉, and the thickness of the light-diffusing layer was 25 占 퐉 in Example 6, . The obtained results are shown in Table 1.

[Examples 7 to 9]

In Examples 7 to 9, the kinds (including the difference in average particle diameter) of the organic fine particles to be blended in the silicone resin were examined.

That is, in Example 7, the kind of the organic fine particles was changed from PMMA particles (SSX-104, average particle diameter: 4 탆, refractive index: 1.49, manufactured by Sekisui Kasei Kogyo K.K.) to PMMA particles (available from Sekisui Chemical Co., (Manufactured by Sekisui Chemical Co., Ltd., SSX-102, average particle diameter: 2 占 퐉, refractive index: 1.49), and in Example 8, the kind of organic fine particles was changed to PMMA particles (SX-350 manufactured by Soken Chemical & Engineering Co., Ltd., average particle diameter: 3.5 占 퐉, refractive index: 1.49) was used as the organic fine particles in Example 9, 1.60), a screen was prepared in the same manner as in Example 1, and the haze value and the like were measured. The obtained results are shown in Table 1.

[Example 10]

In Example 10, a patch-type composite projection screen comprising a substrate and a light-diffusing layer provided with a light control member having anisotropic light diffusing property was prepared and the influence thereof was examined.

That is, an anisotropic light-diffusing film shown in Fig. 4 was prepared as a light control member having anisotropic light diffusing property.

This anisotropic light-diffusing film was prepared in accordance with the following procedure.

&Lt; Preparation of composition for anisotropic light-diffusing film >

Polypropylene glycol, isophorone diisocyanate and 2-hydroxyethyl methacrylate were reacted in a vessel equipped with a stirrer to prepare a polyether urethane methacrylate having a weight average molecular weight of 9,900 (refractive index at a wavelength of 589 nm of 1.46 ).

Then, o-phenylphenoxyethoxyethyl acrylate (NK Ester A-LEN-10, manufactured by Shin-Nakamura Chemical Co., Ltd.) having a refractive index of 1.58 at a wavelength of 589 nm was added to 100 parts by weight of the obtained polyether urethane methacrylate ) And 5 parts by weight of 2-hydroxy-2-methylpropiophenone as a photopolymerization initiator were added and mixed at 80 DEG C until homogeneity was obtained to obtain an anisotropic light-diffusing film composition .

&Lt; Application of composition for anisotropic light-diffusing film >

Subsequently, the obtained composition for an anisotropic light-diffusing film was applied onto a PET film as a process sheet by using an applicator to obtain a photo-curable resin layer having a thickness of 200 mu m.

&Lt; Curing of photocurable resin layer >

Subsequently, a laminate composed of the obtained PET film and a photo-curable resin layer was placed on the conveyor so that the PET film side was in contact with the ultraviolet lamp, and an ultraviolet irradiator ECS-4011GX) was installed so that the angle formed by the flow direction of the conveyor and the long direction of the line-shaped ultraviolet lamp was perpendicular to the direction of the conveyor. In addition, the ultraviolet ray irradiating device and the conveyor corresponding to the ultraviolet ray irradiating device are boxed so as to prevent external light from entering, and ultraviolet rays emitted from the ultraviolet ray irradiating device are emitted in the direction of flow of the conveyor (flow direction of the photocurable resin layer) The irradiation width of the ultraviolet ray in the flow direction of the photo-curable resin layer was adjusted with two shading plates so as to be as desired. In this case, when the ultraviolet rays irradiated to the surface of the photocurable resin layer are viewed from the long side of the line-shaped ultraviolet lamp, when the normal direction of the photocurable resin layer is 0 deg. The angle was set to be 30 degrees. The ultraviolet lamp was installed so that the angle formed by the longitudinal direction of the ultraviolet lamp and the longitudinal direction of the laminate was a right angle.

Then, while the ultraviolet light was irradiated in an air atmosphere such that the peak illuminance on the surface of the photocurable resin layer was 10 mW / cm 2 and the accumulated light quantity was 80 mJ / cm 2, the laminate was irradiated with ultraviolet rays at 0.2 m / .

<Post processing>

Then, a release film (SP-PET382050, manufactured by LINTEC CO., LTD.) Was laminated on the surface of the photo-curable resin layer, and ultraviolet irradiation was performed under the same conditions as those described above.

As a result, an anisotropic light-diffusing film having a total thickness of 200 mu m, an inclination angle of 22 DEG of the cured product on the cross-sectional line (the normal direction of the film plane being 0 DEG) and a length of 165 mu m in the thickness direction of the louver structure was obtained. The total thickness was measured by a static pressure gauge (manufactured by Takara Seisakusho Co., Ltd., Techroku PG-02J), and the inclination angle and length of the cured product on the cross-sectional line were measured based on an electron microscope photograph.

Then, the prepared anisotropic light-diffusing film was peeled off from the process sheet, and the exposed surface was stuck to the substrate side of the screen obtained in Example 2 with a commercially available acrylic adhesive, whereby an anisotropic light-diffusing film, (PET film), and a light-diffusing layer were laminated in this order.

Various tests such as the haze value were carried out in the same manner as in Example 1 except that the peeled film on the anisotropic light-diffusing film was peeled off.

For evaluating the projection property of the screen, it is preferable that the angle of inclination of the light ray of the projector and the cured product on the cross-sectional line be the shallowest angle (the ultraviolet ray irradiation direction at the time of producing the anisotropic light- ) Was adjusted by adjusting the upper, lower, left, and right sides of the laminate of the screen and the glass. The obtained results are shown in Table 1.

[Comparative Example 1]

A screen was prepared in the same manner as in Example 1 except that no organic fine particles were added to the silicone resin in the light diffusion layer in Comparative Example 1, that is, the amount of the organic fine particles was 0 part by weight, Respectively. The obtained results are shown in Table 1.

[Comparative Example 2]

A screen was prepared and the haze value and the like were measured in the same manner as in Example 1 except that the amount of the organic fine particles to the silicone resin in the light diffusion layer was changed to 17 parts by weight. The obtained results are shown in Table 1.

[Comparative Example 3]

In Comparative Example 3, the kind of the organic fine particles in the light-diffusing layer was changed from SSX-104 to Tosparu 145 (manufactured by Toray Industries, Inc., average particle size: 4.5 탆, refractive index: 1.43) A screen was prepared in the same manner as in Example 1 except that the haze value and the like were measured. The obtained results are shown in Table 1.

[Comparative Example 4]

To 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 and having a weight average molecular weight of 2,000,000, trimethylolpropane-modified xylylene diisocyanate 0.2 part by weight of 3-glycidoxypropyltrimethoxysilane (product name: KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) and 0.2 part by weight of PMMA particles (manufactured by Shinagaku Kogyo Co., , SSX-104, average particle diameter: 4 占 퐉, refractive index: 1.49) were mixed and mixed in ethyl acetate to obtain a coating liquid.

Subsequently, the obtained coating liquid was applied to the side of the adhesion treatment surface of a PET film (Lumirra U48, thickness: 125 占 퐉, manufactured by Toray Industries, Inc.), heat treatment was conducted at 90 占 폚 for 1 minute, And cured for one week. As a result, a screen having a light diffusion layer made of an acrylic resin and having a thickness of 15 탆 was provided on one side of the substrate.

Then, in the same manner as in Example 1, the haze value and the like of the obtained screen were measured. The obtained results are shown in Table 1.

[Comparative Example 5]

Except that the kind of fine particles in Comparative Example 5 was changed from SSX-104 to Tosparu 145 (manufactured by Toray Industries, Inc., average particle diameter: 4.5 탆, refractive index: 1.43) and the amount of fine particles was changed to 4.45 parts by weight , And Comparative Example 4, a haze value and the like were measured. The obtained results are shown in Table 1.

[Table 1]

10: Attachment projection screen (screen)
12: substrate
14: light diffusion layer
14a: silicone resin
14b: organic fine particles
16: peeling film
18: adherend (window glass or showcase)
20: light control member (anisotropic light diffusing film)
21: Attachment type composite projection screen
22: High refractive index cured product
23: louver structure
24: Low refractive index cured product
36: incident light

Claims (8)

A substrate, and a light diffusion layer,
Wherein the light diffusion layer comprises a silicone resin and organic fine particles having an average particle diameter of 1 to 10 mu m,
The thickness of the light diffusion layer is set to a value within a range of 5 to 30 mu m,
The 180 占 peeling force measured in accordance with JIS Z 0237: 2009 on the light diffusion layer side is set to a value within a range of 20 to 200 mN / 25 mm,
Wherein a haze value measured according to JIS K 7136: 2000 is set to a value of 20% or more. The method according to claim 1,
Wherein a blending amount of the organic fine particles is set to a value within a range of 1 to 15 parts by weight with respect to 100 parts by weight of the silicone resin. 3. The method according to claim 1 or 2,
And an influence represented by t /? 占 A when the thickness of the light-diffusing layer is t (占 퐉), the average particle diameter of the organic fine particles is? (占 퐉), and the blending amount of the organic fine particles is A And the factor is set to a value within a range of 3 to 100. The projection screen according to claim 1, 4. The method according to any one of claims 1 to 3,
Wherein the refractive index difference between the silicone resin and the organic fine particles is set to a value of 0.02 or more. 5. The method according to any one of claims 1 to 4,
Wherein the thickness of the base material is within a range of 50 to 250 占 퐉. 6. The method according to any one of claims 1 to 5,
Wherein the heat shrinkage ratio of the substrate is set to a value of 2% or less with respect to either the MD direction or the TD direction after heating at 150 占 폚 for one hour. 7. The method according to any one of claims 1 to 6,
Wherein a light control member having an anisotropic light diffusing property or an isotropic light diffusing property is further provided on the front surface and / or the back surface of the base material. 8. The method according to any one of claims 1 to 7,
Wherein a protective film is laminated on a surface of the light diffusion layer opposite to the substrate.

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