KR102515861B1 - Pasting projection screen - Google Patents

Abstract

The present invention is structured thin enough not to cause image blurring, has sufficient projection properties as a transmissive screen, has excellent adhesion and durability to an adherend such as glass, and is excellent in re-peelability, It is an object to provide a screen that does not deteriorate visibility due to mixing of air bubbles or the like even when reused.
In order to solve the above problems, a stick-on projection screen is configured to include a base material and a light diffusion layer, and the light diffusion layer contains a silicone resin and organic particulates having an average particle diameter of 1 to 10 μm, and the light diffusion layer The thickness of is set to a value within the range of 5 to 30 μm, the 180° peel force measured in accordance with JIS Z 0237: 2009 on the light diffusion layer side is set to a value within the range of 20 to 200 mN/25 mm, and , The haze value measured in accordance with JIS K 7136:2000 is set to a value of 20% or more.

Description

Attached projection screen {PASTING PROJECTION SCREEN}

The present invention relates to a stick-on type projection screen (hereinafter sometimes referred to simply as a screen) for enlarging and projecting an image irradiated from a projector by being attached to an adherend such as a windowpane.

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

However, these conventional projection screens generally have a small area, but have problems such that the screen to be viewed is dark, and moiré patterns are easily generated in the image.

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

However, in practice, since a part of the external light is not absorbed in the black stripe and invades the inside of the optical system, the decrease in contrast is still a problem.

Therefore, a transmissive screen has been proposed that is attached to a transparent body such as a show window and allows a viewer on the rear side to recognize an image emitted from a projector (see Patent Document 1, for example).

More specifically, as shown in Fig. 6, a transmissive screen 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). am.

Further, 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 μm 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 is 0.91 < It is a value within the range of n<1.09, and it is said that a transmissive screen having a haze value of 3% or more and an image sharpness of 60% or more is preferable.

In addition, a back projection system using a flexible transmissive screen having a high ambient light rejection rate has also been proposed (see Patent Document 2, for example).

More specifically, a step for providing a projector capable of presenting an image, a back surface for receiving light from the projector, a display unit on the opposite side to the back surface, and a bright surrounding when the image is not projected on the screen by the projector. providing a flexible screen having a light absorbing layer that renders the screen substantially opaque under conditions; providing a peelable adhesive; selecting a substantially transparent surface at a viewable location; onto a substantially transparent surface using a peelable adhesive, and projecting an image from a projector onto the back side of a screen to provide information to a viewer.

As the flexible screen, it is said that it is preferable to use a bead 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.

In addition, as an adhesive for adhering the screen to a transparent surface, it is preferable to use a peelable adhesive having a peeling force of 0.5 to 2 pounds/inch (about 280 to 1100 mN/25 mm) and a particulate acrylic adhesive as a main component. there is.

Japanese Unexamined Patent Publication No. 2007-34324 (scope of claims, etc.) Japanese Patent Publication No. 2004-533636 (Scope of claims, etc.)

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

For this reason, the forward scattering light-scattering layer and the pressure-sensitive adhesive layer are independently separated, resulting in excessive thickness of the transmissive screen, resulting in blurring of the image when a predetermined image is projected.

In addition, 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 the adherend (glass plate, etc.) There was also a problem with poor usability because it was not considered.

In addition, in the back projection system using the flexible transmissive screen disclosed in Patent Literature 2, a flexible screen including a bead screen and the like and a peelable adhesive layer are independently provided.

For this reason, the entire transmissive screen becomes excessively thick, and the problem of blurring an image has been seen. In addition, although the adhesive layer can be peeled off, the adhesive durability is poor, and unintentional peeling has been feared.

In addition, the average particle diameter of the beads in a bead-type screen or the like is excessively large, making it difficult to use as a screen for projecting a high-definition image, and problems such as poor light diffusivity have been observed.

That is, the present invention is configured thin enough not to cause image blurring, has sufficient projection properties as a transmissive screen, has excellent adhesion to an adherend such as glass and its durability, and is also excellent in re-peelability. , It is an object of the present invention to provide a screen that does not deteriorate visibility due to mixing of air bubbles or the like even when reused after being once peeled off.

According to the present invention, it is configured to include a base material and a light diffusion layer, the light diffusion layer contains a silicone resin and organic particulates having an average particle diameter of 1 to 10 μm, and the thickness of the light diffusion layer is 5 to 30 μm. The value is within the range, and the 180° peel force measured in accordance with JIS Z 0237:2009 on the light diffusion layer side is within the range of 20 to 200 mN/25 mm, and also in accordance with JIS K 7136:2000 The above-mentioned problems can be solved by providing a stick-on projection screen characterized in that the haze value measured by the above is set to a value of 20% or more.

That is, while using a silicone resin as the main material of the light-diffusion layer, organic particulates having a predetermined average particle diameter (φ) are used, and the thickness (t) of the light-diffusion layer, the 180° peeling force, and the haze value, respectively By controlling it within a predetermined range, it is thin enough that blurring of the image does not become a problem (the number of films is small), excellent projection as a screen, and can be affixed without biting air bubbles, adherends such as glass It is possible to obtain a stick-on type projection screen that is excellent in adhesion to and durability thereof, can be easily peeled off after use, and can be applied without biting air bubbles even when reused.

Further, in constituting the stick-on projection screen of the present invention, it is preferable to set the compounding amount (A) of the organic particulates to a value within the range of 1 to 15 parts by weight with respect to 100 parts by weight of the silicone resin.

By comprising in this way, a predetermined or more haze value can be obtained stably, without excessively reducing light transmittance (total light transmittance).

In addition, in constituting the adhesive projection screen of the present invention, the thickness of the light diffusion layer is t (μm), the blending amount of organic particulates is A (parts by weight), and the average particle diameter of organic particulates is φ (μm) When doing so, it is preferable to set the influence factor represented by t×A/φ to a value within the range of 3 to 100.

By configuring the influence factor defined in this way to be a value within a predetermined range, a stick-on projection screen having a haze value and adhesion within a predetermined range can be obtained more accurately and stably.

Further, in constituting the adhesive projection screen of the present invention, it is preferable to set the refractive index difference between the silicone resin and the organic fine particles to a value of 0.02 or more.

By configuring in this way, a predetermined haze value can be obtained more quantitatively and stably.

Further, in constituting the adhesive projection screen of the present invention, it is preferable to set the thickness of the substrate to a value within the range of 50 to 250 μm.

With this configuration, even if the silicone resin is applied on the base material and heated to a predetermined temperature (for example, 130 ° C. or higher) when drying, the base material can exhibit a predetermined heat resistance and maintain good smoothness, Furthermore, a stick-on type projection screen having better light diffusivity and total light transmittance can be obtained.

Further, in constituting the stick-on projection screen of the present invention, the heat shrinkage rate of the substrate is preferably set to a value within the range of 2% or less in either the MD direction or the TD direction after heating at 150 ° C. for 1 hour.

With this configuration, when the silicone resin is applied on the substrate and dried, even if it is heated at a predetermined temperature (eg, 130° C. or higher) for a predetermined period of time, the substrate exhibits a predetermined heat resistance and maintains good smoothness. can From such a viewpoint, it is more preferable to make the said thermal contraction rate into 1.5 % or less, and it is especially preferable to make it 1.0 % or less.

Further, in constituting the stick-on 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 either the front surface or the rear surface of the base material.

With this configuration, adjustment to a desired haze value is facilitated, the angle at which a viewer can view an image is widened, and the uniformity of light diffusion within the screen is further improved, so that a large number of viewers, A good and clear image can be visually recognized.

Further, in constituting the stick-on projection screen of the present invention, it is preferable that a protective film is laminated on the surface of the light diffusion layer on the opposite side to the base material.

In this way, by including the protective film, it is possible to prevent dust adhesion as contamination to the surface of the light diffusion layer, and handling (transportability) of the stick-type projection screen, light diffusing property, stickiness, etc. The reproducibility of the effect can be made better.

1(a) to (d) are diagrams showing configuration examples of a stick-on type projection screen or the like.
Fig. 2 (a) is a diagram showing the relationship between the average particle diameter of the organic particulates in the adhesive projection screen, the haze value, and the adhesion, respectively, and Fig. 2 (b) is the organic particulates in the adhesive projection screen 2(c) is a diagram showing the relationship between the film thickness of the light-diffusing layer in a stick-on projection screen, haze value and adhesion, respectively. .
3 is a diagram showing the relationship between the influence factor (t×A/φ), haze value, and adhesion in the stick-on type projection screen, respectively.
4(a) to (b) are views provided to explain the anisotropic light-diffusing film.
Fig. 5 is a diagram provided to explain the relationship between each incident angle and haze value in a stick-on composite projection screen formed by laminating an anisotropic light-diffusing film on the substrate side of the stick-on projection screen. .
Fig. 6 is a diagram explaining the aspect of a conventional light-diffusion adhesive sheet.

An embodiment of the present invention is constituted by including a base material and a light diffusion layer, the light diffusion layer contains a silicone resin and organic particulates having an average particle diameter of 1 to 10 μm, and the thickness of the light diffusion layer is 5 to 30 μm. It is set to a value within the range of μm, and the 180 ° peel force measured in accordance with JIS Z 0237: 2009 on the light diffusion layer side is set to a value within the range of 20 to 200 mN / 25 mm, and JIS K 7136: 2000 It is a stick-on type projection screen characterized in that the haze value measured based on is 20% or more.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the stick-on type projection screen of this invention is concretely demonstrated, referring an enemy drawing.

1. Adhesion of adhesive projection screen

The sticking-type projection screen in this embodiment, when sticking the light-diffusion layer side to the glass plate as an adherend, measured in accordance with JIS Z 0237: 2009, 180 ° peeling force (peeling speed 300 mm / min) (hereinafter, However, it is characterized in that the adhesion force) is adjusted within the range of 20 to 200 mN/25 mm.

That is, when the adhesive force is 20 mN/25 mm or more, it is possible to maintain the attached state with good durability even in cooling, heating, or a change in outside temperature, and function as a screen. From such a viewpoint, as for the said adhesive force, it is more preferable that it is 30 mN/25 mm or more, and it is more preferable that it is 35 mN/25 mm or more.

Moreover, while being able to set it as a screen excellent in bubble omission at the time of sticking because the said adhesive force is 200 mN/25 mm or less, when it becomes unnecessary, it can peel off easily. In addition, it can be used as a screen excellent in bubble release property as in the first ash even at the time of re-applying. Bubbles are more conspicuous as the screen becomes thinner, and more conspicuous as the projection property of the screen increases.

From such a viewpoint, as for the said adhesive force, it is more preferable that it is 100 mN/25 mm or less, and it is especially preferable that it is 80 mN/25 mm or less.

2. Haze value of adhesive projection screen

The screen in this embodiment is characterized in that the haze value measured based on JIS K 7136:2000 is a value of 20% or more.

In addition, the haze value (haze value) of the screen is obtained by measuring the total light transmittance and diffuse transmittance of the screen using an integrating sphere type light transmittance measuring device, and by formulas (2) and (3) shown in Examples It is the value to be saved.

That is, when the haze value is 20% or more, it has projection properties as a screen even under a bright environment. From such a viewpoint, as for the said haze value, it is more preferable that it is 50% or more, and it is especially preferable that it is 70% or more.

In addition, the upper limit of the haze value is not particularly limited, but when the haze value is excessively large, backscattered light increases and the total light transmittance becomes insufficient in some cases. From such a viewpoint, the haze value is more preferably set to a value of 99% or less, and further preferably set to a value of 98% or less.

3. Basic composition of adhesive projection screen

As shown in Fig. 1 (a), a stick-on projection screen (hereinafter sometimes referred to simply as a screen) 10 is basically composed of a substrate 12, a silicone resin 14a, and organic particulates 14b. ) It is configured to include a light diffusion layer 14 formed by blending.

In addition, before use, in order to prevent adhesion of dust and the like from the surroundings, as shown in FIG. It is desirable to have

Then, as shown in Fig. 1(c), after removing the protective film 16 on the surface, the screen 10 is placed through the light diffusion layer 14 to form a window glass or showcase as the adherend 18. It is preferable to stick it to a glass base material, such as, and use it.

Accordingly, the viewer can recognize an image projected from a projector through a stick-on projection screen attached to a window glass, showcase, or the like, as a dynamic image or character information obtained by spreading the image to a predetermined size.

In addition, in the configuration of the stick-on screen shown in Figs. 1(c) and (d), light from the projector usually enters from the base material 12 side, but depending on the application, the projector is emitted from the adherend 18 side. It is also possible to enter light from the sun.

Here, the substrate, which is a part of the screen, functions as a support for the light diffusion layer, and improves handling, transportability, ease of manufacture, decorativeness, etc. as a screen, as well as mechanical protection for the light diffusion layer, UV shielding properties, and oxidation prevention. It is desirable to also have a function of imparting sex and the like.

In addition, as will be described later, such a substrate may have a function as a heat-resistance retaining member when applying and drying a coating solution containing a silicone resin and organic particulates.

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

That is, there are two types of screens: a transmissive screen viewed from the opposite side of the projector with the screen interposed therebetween, and a reflective screen viewed from the same side as the projector. It transmits light while diffusing, and has a function of recognizing the viewer on the rear side of the screen.

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

In addition, although the screen according to the present invention can be used in either case of a transmissive screen or a reflective screen, it is more preferable to use it as a transmissive screen from the viewpoint of maximizing the effect of the present invention.

4. Registration

(1) Type

The type of substrate is not particularly limited, but is preferably a polyester film such as polyethylene terephthalate (hereinafter sometimes referred to as a PET film), polybutylene terephthalate, or polyethylene naphthalate.

The reason for this is that such a polyester film is excellent in transparency, heat resistance, or mechanical strength, and is also relatively inexpensive.

More specifically, when a silicone resin is applied on a substrate and dried, even if heated at a predetermined temperature (eg, 130° C. or higher), the substrate exhibits a predetermined heat resistance, so good smoothness can be maintained, and further This is because a stick-on projection screen having stable light diffusivity and light transmittance can be obtained.

In addition, as plastic films other than polyester films, polyolefin films such as polyethylene films and polypropylene films, cellophane, diacetyl cellulose films, triacetyl cellulose films, acetyl cellulose butyrate films, polyvinyl chloride films, and 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, Polyamide film, acrylic resin film, polyurethane resin film, norbornene-based polymer film, cyclic olefin-based polymer film, cyclic conjugated diene-based polymer film, vinyl alicyclic hydrocarbon polymer film, etc., alone or in combination of two or more, suitable It can be mentioned as a film.

In addition, in the case of a base material, in particular, a plastic film, for the purpose of improving adhesion to the light diffusion layer, surface treatment such as priming, oxidation, or roughening treatment (roughening method) is applied to one or both surfaces as desired. it is desirable

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

Moreover, as a roughening process, the sandblasting method, the solvent processing method, the etching processing method, etc. are mentioned, for example.

In addition, the shape of the base material may be appropriately changed according to the use or purpose, but it is also preferable to use a porous film having openings, for example, openings with a diameter of 0.1 to 10 mm. It is because such a form improves flexibility and handleability, and can be applied not only to flat adherends but also to curved adherends.

(2) thickness

In addition, it is preferable to set the thickness of the substrate to a value within the range of 50 to 250 µm usually.

The reason for this is that, when the thickness of the substrate is less than 50 μm, fine waviness may occur on the substrate due to heating in forming the light diffusion layer, reducing the sharpness of images on the screen in some cases.

On the other hand, if the thickness of the base material exceeds 250 μm, the blurring of the image on the screen due to the thickness of the base material may increase and the sharpness of the image may decrease.

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

In addition, it is more preferable to set the upper limit thickness of the substrate to a value of 220 μm or less, and it is more preferable to set it to a value of 190 μm or less.

(3) Heat shrinkage rate

The heat shrinkage rate of the base material can be measured in accordance with JIS K 7133: 1999, but it is set to 2% or less in either the MD direction or the TD direction at a target temperature of 150°C and after 1 hour of heating time. it is desirable

The reason for this is that by defining the heat shrinkage rate of the base material in this way, when the silicone resin is applied on the base material and dried, even if it is heated at a prescribed temperature for a prescribed period of time, the base material exhibits a prescribed heat resistance and maintains good smoothness. because it can

However, if the heat shrinkage rate of the base material is excessively small, the usable base material may be excessively limited, the stretching heat treatment for adjusting the heat shrinkage ratio may become complicated, or the manufacturing cost may be remarkably high.

Therefore, it is more preferable to set the lower limit of the heat shrinkage rate of such a base material to a value of 0.001% or more, and it is more preferable to set it to a value of 0.01% or more.

Moreover, it is more preferable to set the upper limit of the heat shrinkage rate of such a base material to a value of 1.5% or less, and it is more preferable to set it to a value of 1.0% or less.

In addition, the MD direction means a long direction when forming a base film, and the TD direction means a width direction when forming a base film.

(4) Light transmittance (visible light transmittance)

Further, it is preferable to set the light transmittance of the base material to 80% or more in the visible light region.

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

However, if the light transmittance of the substrate is excessively high, usable substrate materials may be excessively limited, stretching heat treatment for adjusting the light transmittance may become complicated, and manufacturing costs may be remarkably high.

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

Moreover, it is more preferable to set the upper limit of the light transmittance of such a base material to a value of 99.9% or less, and it is still more preferable to set it to a value of 99% or less.

5. Light diffusion layer

(1) silicone resin

(1)-1 main component

By containing a silicone resin together with organic particulates, the light-diffusion layer can be peeled off again, reused, etc. while sticking a screen containing this to an adherend.

That is, the light-diffusing layer made of such a silicone resin as a main component is adhered to the adherend while extruding air due to its self-adhering property, so there is no optical defect caused by air bubble mixing.

This is an effect obtained even if the screen is hard. That is, the screen can be constructed on site while preventing the mixing of air bubbles by means of the light-diffusing layer composed of a silicone resin as a main component.

In addition, while the light-diffusion layer made of a silicone resin as a main component adheres closely to the adherend and adheres very firmly, it can be re-peeled without any adhesive residue.

In addition, a light diffusion layer composed of a silicone resin as a main component is used for a portion closest to an adherend such as a window glass, that is, a portion closest to irradiation of external light. However, the use of a silicone resin provides excellent light resistance.

Here, the silicone resin can contain, for example, organopolysiloxane or a derivative thereof or any one of them as a main component.

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

The organopolysiloxane having this siloxane bond as a main skeleton and having an alkenyl group is, specifically, a compound represented by the formula (1) below, 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 an unsubstituted or substituted monovalent hydrocarbon group having the same or different carbon atoms of 1 to 12, preferably 1 to 8, a is 1.5 to 2.8, preferably 1.8 to 2.5, More preferably, it is an integer in the range of 1.95 to 2.05)

In addition, as the unsubstituted or substituted monovalent hydrocarbon group bonded to the silicon atom represented by R1 described above, for example, a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, a hexenyl group, and a cyclohexenyl group. , alkenyl groups such as octenyl group, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, cyclohexyl group, octyl group, nonyl group , alkyl groups such as decyl groups, aryl groups such as phenyl, tolyl, xylyl, and naphthyl groups, aralkyl groups such as benzyl, phenylethyl, and phenylpropyl groups, and some or all of the hydrogen atoms in these groups are fluorine or bromine. , those substituted with a halogen atom such as chlorine, a cyano group, etc., such as a chloromethyl group, a chloropropyl group, a bromoethyl group, a trifluoropropyl group, a cyanoethyl group, and the like.

Moreover, as an alkenyl group in organopolysiloxane, if it is a vinyl group, curing time is short and it is preferable from a productivity point.

Organohydrogenpolysiloxane has a SiH group in its molecule and can be cured by an addition reaction between the alkenyl group of organopolysiloxane having a siloxane bond as a main skeleton and an alkenyl group.

(1)-2 platinum catalyst

Further, examples of the platinum catalyst for curing the silicone resin include platinum black, platinic chloride, chloroplatinic acid, a reaction product of chloroplatinic acid and monohydric alcohol, a complex of chloroplatinic acid and olefins, and platinum bisacetoacetate. there is.

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

The reason for this is that if the amount of the platinum catalyst used is less than 0.01 part by weight, the re-peelability may be poor due to insufficient curing.

On the other hand, if the amount of the platinum catalyst used exceeds 3.0 parts by weight, adhesion may be deteriorated, and gelation due to an addition reaction may be rapid, making stable application difficult in some cases.

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

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

(1)-3 Other polyorganosiloxanes

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

And when blending such a polyorganosiloxane, it is preferable to set the blending amount to a value of 50 parts by weight or less with respect to 100 parts by weight of the addition-type organopolysiloxane.

The reason for this is that, when the compounding amount of such polyorganosiloxane exceeds 50 parts by weight, the adhesion may increase and re-peeling may become difficult.

However, if the blending amount of such polyorganosiloxane is too small, the addition effect may not be expressed.

Therefore, regarding the lower limit of the blending amount of such polyorganosiloxane, it is more preferable to set it as 1 part by weight or more, and it is more preferable to set it as 5 parts by weight or more.

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

In addition, well-known additives, such as a reaction retardant, an antioxidant, and an antistatic agent, can be suitably blended with the silicone resin as components other than those described above.

And, when adding these additives, it depends also on the kind of additive, but it is preferable to set the compounding quantity to a value within the range of 0.01 to 10 parts by weight with respect to 100 parts by weight of addition type organopolysiloxane.

(1)-4 refractive index

Moreover, it is preferable to make the refractive index of a silicone resin into the value within the range of 1.35-1.48.

This reason is because when the refractive index of such a silicone resin becomes a value exceeding 1.48, the obtained haze value may become excessively small in relation to the refractive index of organic particulates.

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

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

Moreover, it is more preferable to set the upper limit of the refractive index of the silicone resin to a value of 1.47 or less, and it is more preferable to set it to a value of 1.45 or less.

(2) Organic fine particles

(2)-1 Average particle size

In addition, it is characterized in that the average particle diameter of the organic fine particles is a value within the range of 1 to 10 μm.

The reason for this is that when the average particle size of the organic particulates is less than 1 μm, the haze value in the light diffusing layer decreases rapidly, or aggregation becomes easy, making it difficult to disperse and mix uniformly. because there is

On the other hand, when the average particle diameter of the organic fine particles exceeds 10 μm, the adhesion of the light-diffusing layer may rapidly decrease, or it may be difficult to disperse and mix uniformly even though it is difficult to aggregate. .

In other words, if it is the average particle diameter of such organic particulates, t × A / φ as an influence factor described later can be easily controlled to a value within a predetermined range, and furthermore, the haze value and adhesion within the predetermined range are more stable and because it can be obtained quantitatively.

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

In addition, it is more preferable to set the upper limit of the average particle diameter of the organic fine particles to a value of 8 μm or less, and it is more preferable to set it to a value of 6 μm or less.

In addition, the average particle diameter of the organic fine particles can be determined by a laser diffraction scattering method.

Here, with reference to Fig. 2 (a), the effect of the average particle diameter of the organic fine particles on the haze value (characteristic curve A) and adhesion (characteristic curve B) of the light diffusion layer (which can be equated with a screen) will be explained. .

That is, in Fig. 2 (a), the average particle diameter (μm) of organic particulates is selected and represented on the horizontal axis, and the haze value (%) is selected and shown on the left vertical axis, and the right vertical axis is adhesion force (mN / 25 mm ) is adopted.

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

In addition, as understood from the behavior of the characteristic curve B, as the average particle diameter of the organic particulates increases in the same way, the adhesion force tends to decrease slightly, and more specifically, from about 54 mN/25 mm to about 49 mN/25 mm. is lowered to

Therefore, although the average particle diameter of the organic particulates does not have such a strong influence, it has a certain influence on the haze value and adhesion of the light-diffusing layer, so it can be said to be an effective influence factor when finely adjusting these values.

(2)-2 Type 1

In addition, the type of organic fine particles (monomer type) is not particularly limited as long as a refractive index difference of, for example, a difference of 0.02 or more occurs between the silicone resin and a predetermined haze value is obtained, but (meth)acrylic acid ester , (meth)acrylic acid resins derived from monomers such as (meth)acrylic acid, acrylamide, and diol compounds are preferred.

The reason for this is that when the organic particulates are silicone resin particles or silica particles, the refractive index difference with the silicone resin becomes excessively small, for example, a value of less than 0.02, and the obtained haze value may be remarkably small. am.

Conversely, it can be said that it is preferable to set the refractive index difference to a value of 0.02 or more, and particularly preferably to a value of 0.05 or more, between the types of organic particulates and the silicone resin.

In addition, polycarbonate resins and polyester resins are also known as types of organic particulates, but these condensed polymers are easily hydrolyzed, and durability and light transmittance may be significantly reduced.

Therefore, regarding the type of organic fine particles, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, (meth)acrylic acid 2 - It is more preferable to use a (meth)acrylic acid resin system derived from at least one of monomers such as ethylhexyl and dodecyl (meth)acrylate.

(2)-3 Type 2

In addition, with respect to type 2 (crosslinking agent) of organic particulates, since the durability, mechanical strength, glass transition temperature, light resistance, etc. of the organic particulates are improved, a crosslinking agent such as divinylbenzene is extinguished as a monomer when polymerizing the organic particulates. It is preferable to mix in a fixed amount and then polymerize the organic particulates.

That is, with respect to the total amount of monomers (100% by weight), a crosslinking agent is usually blended so that it is in the range of 0.1 to 10% by weight, and then solution polymerization or titration polymerization is performed to form a crosslinking agent having a uniform average particle diameter and high heat resistance 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 refractive index difference with the silicone resin, but is usually preferably a value within the range of 1.42 to 1.65.

This reason is because when the refractive index of these organic particulates becomes a value less than 1.42, the haze value obtained may become excessively small in relation to the refractive index of a silicone resin. Moreover, it is because the kind of monomer used when obtaining suitable organic particulates is excessively restricted, or the manufacturing cost of organic particulates may increase.

On the other hand, when the refractive index of organic particulates exceeds 1.65, the type of monomer used when obtaining suitable organic particulates may be excessively limited or the manufacturing cost of organic particulates may increase.

Therefore, it is more preferable to set the lower limit of the refractive index of the organic fine particles to a value of 1.45 or more, and it is further more preferable to set it to a value of 1.48 or more.

Moreover, it is more preferable to set the upper limit of the refractive index of organic particulates to a value of 1.60 or less, and it is more preferable to set it to a value of 1.55 or less.

(2)-5 blending amount

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

This reason is that the haze value of the light-diffusing layer may rapidly decrease when the blending amount of the organic particulates is less than 1 part by weight.

On the other hand, if the blending amount of the organic particulates exceeds 15 parts by weight, the adhesion of the light-diffusing layer may rapidly decrease.

In other words, with the blending amount of such organic particulates, t × A / φ as an influencing factor described later can be easily controlled to a value within a predetermined range, and furthermore, the haze value and adhesion within the predetermined range are more stable and quantitative because it can be obtained by

Therefore, it is more preferable to set the lower limit of the blending amount of the organic particulates to a value of 3 parts by weight or more, and it is more preferable to set it to a value of 8 parts by weight or more.

Moreover, it is more preferable to set the upper limit of the blending amount of the organic fine particles to a value of 13 parts by weight or less, and it is still more preferable to set it to a value of 12 parts by weight or less.

Here, referring to FIG. 2(b), the effect of the blending amount of organic particulates on the haze value (characteristic curve A) and adhesion (characteristic curve B) of the light diffusion layer (which can be equated with a screen) will be explained.

That is, the horizontal axis of Fig. 2 (b) shows the blending amount (parts by weight) of the organic particulates with respect to 100 parts by weight of the silicone resin, and the vertical axis on the left shows the haze value (%), and the vertical axis on the right shows , Adhesion force (mN/25 mm) is adopted and shown.

And, as understood from the behavior of the characteristic curve A in Fig. 2 (b), as the blending amount of the organic particulates increases from 1 part by weight to 17 parts by weight, the haze value shows a tendency to rise remarkably. , has risen from about 24% to about 98%.

Further, as can be understood from the behavior of the characteristic curve B, as the blending amount of the organic particulates increases similarly, the adhesive force shows a tendency to gradually decrease, more specifically, from about 54 mN/25 mm to about 16 mN/25 mm. is declining

Therefore, since the compounding amount of the organic particulates has a strong influence on the haze value and adhesion of the light-diffusing layer, it can be said to be an effective influence factor when it is desired to greatly change these values.

(3) Thickness

It is characterized in that the thickness of the light diffusion layer is set to a value within the range of 5 to 30 μm.

The reason for this is that when the thickness of such a light-diffusing layer is less than 5 μm, it is difficult to obtain desired adhesion and holding power, and the haze value may be excessively low.

On the other hand, when the thickness of such a light-diffusing layer exceeds 30 μm, the curing time is prolonged, which is economically disadvantageous, and also may deteriorate the optical properties of the substrate or the like.

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

Further, it is more preferable to set the upper limit of the thickness of the light diffusion layer to a value of 25 μm or less, and it is further more preferable to set it to a value of 20 μm or less.

Here, referring to Fig. 2(c), the effect of the thickness of the light diffusion layer (which can be equated with a screen) on the haze value (characteristic curve A) and adhesion (characteristic curve B) of the light diffusion layer will be explained. .

That is, in Fig. 2(c), the horizontal axis represents the film thickness (μm) of the light diffusion layer, the left vertical axis represents the haze value (%), and the right vertical axis represents the adhesion (mN/25 mm ) is adopted.

And, as understood from the behavior of the characteristic curve A in Fig. 2(c), as the film thickness of the light diffusion layer increases from 10 µm to 25 µm, the haze value tends to increase. More specifically, , rising from about 41% to about 72%.

Further, as can be understood from the behavior of the characteristic curve B, as the film thickness of the light diffusing layer similarly increases, the adhesive strength also shows a tendency to gradually increase, more specifically, from about 55 mN/25 mm to about 65 mN/25 mN/25 mm. It is increased by mm.

Therefore, since the film thickness of the light-diffusion layer has a strong influence on the haze value of the light-diffusion layer, it can be said to be an effective influence factor when controlling such a value by greatly changing it.

In addition, since the film thickness of the light-diffusion layer has a slight effect on the adhesion of the light-diffusion layer, it can be said to be an effective influence factor even in the case where it is desired to change these numerical values within a subtle range.

(4) Influencing factor

When the thickness of the light-diffusing layer is t (μm), the amount of organic particulates contained therein is A (parts by weight), and the average particle diameter of the organic particulates is φ (μm), t × A / It is preferable to set the influence factor represented by φ to a value within the range of 3 to 100.

The reason for this is that a stick-on projection screen having a haze value and adhesion within a desired range can be obtained more easily and stably by controlling the influencing factor within such a range.

Therefore, it is more preferable to set the lower limit of the influence factor represented by t×A/φ to a value of 10 or more, and more preferably to a value of 30 or more.

Further, it is more preferable to set the upper limit of the influence factor represented by t×A/φ to a value of 80 or less, and even more preferably to a value of 60 or less.

Here, with reference to FIG. 3, the effect of the influence factor represented by t×A/φ on the haze value and adhesion of the light diffusion layer (which can be equated with a screen) will be explained.

That is, on the horizontal axis of FIG. 3, the value (-) of the influence factor expressed as t × A / φ in the light diffusion layer is selected and shown, and on the left vertical axis, the haze value (%) is selected and shown, and on the right On the vertical axis, adhesion force (mN/25 mm) is adopted and shown.

And, as can be understood from the behavior of the characteristic curve A in Fig. 3, as the value of t x A/? increases, the haze value tends to rise remarkably.

More specifically, when txA/φ is 5, the haze value is as low as about 20%, but when txA/φ is 10, the haze value rises to about 40%. Further, when t×A/φ is 20, the haze value is about 80%, and when it is 50 or more, the haze value is about 95%, showing a tendency to saturate.

On the other hand, as can be understood from the behavior of the characteristic curve B, as the value of t×A/φ in the light-diffusing layer increases, the adhesion strength tends to decrease gradually.

More specifically, when t × A / φ is 5 to 25, the adhesion is a value within the range of about 50 to 60 mN / 25 mm, but when t × A / φ is 30, the adhesion is less than about 50 mN / 25 mm is lowered to the value of Further, when t×A/φ is 40, the adhesive force decreases to about 40 mN/25 mm, and when it becomes 60 or more, the adhesive force tends to be less than about 20 mN/25 mm.

Therefore, since t×A/φ in the light-diffusing layer exerts a strong influence on the haze value, it can be said to be an effective influence factor when controlling by greatly changing such a numerical value.

In addition, since t×A/φ in the light-diffusing layer has its own influence on the adhesion, it can be said to be an effective influence factor when changing and controlling such a numerical value in a subtle range.

6. Light control member 1

As a kind of light control member, an anisotropic light-diffusing film (e.g., a louver-type light-diffusing film) 20 shown in Figs. Eh, it is preferable to further laminate.

More specifically, as shown in FIG. 1(d), the anisotropic light-diffusing film 20 is indirectly laminated on the surface side (light incident side) of the light-diffusing layer 14 via the substrate 12. It is preferable to use it as a stick-on composite projection screen 21 made of, or as a stick-on composite projection screen formed by directly laminating without intervening a substrate.

And, in the case of direct lamination without intervening a substrate, the anisotropic light-diffusing film serves as the substrate.

In addition, between the anisotropic light-diffusing film 20 and the substrate 12, an adhesive layer or a pressure-sensitive adhesive layer is usually formed, and it is preferable to bond the two by this.

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

Therefore, by laminating an anisotropic light-diffusing film on the side of the light-diffusion layer on which light enters the projector, a composite projection screen having a combination of anisotropic light-diffusing property and isotropic light-diffusing property is obtained, as shown in characteristic curve B. , the profile showing the haze value can be made more gentle.

Therefore, according to the composite projection screen formed by gradually changing the haze value in this way, the viewing angle characteristics (light diffusion incident angle region) are improved regardless of the angle at which the viewer perceives the image or the incident angle of light from the projector to the screen. It is widened, and a relatively large number of viewers can view a good and clear image from the back side of the screen.

In addition, if it is a composite projection screen comprising a combination of an anisotropic light-diffusing film and a light-diffusing layer, even when performance is deteriorated due to exposure to external light, only the light-diffusing layer can be replaced and the relatively cost-effective anisotropic light-diffusing film can be reused. There is also the advantage of being there.

In addition, in such a composite projection screen, even if the haze value is still low in only the light-diffusion layer, the haze value can be controlled to a higher value as a total due to the haze effect resulting from the anisotropic light-diffusing film.

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

As shown in FIG. 4(a), the anisotropic light diffusing film 20 has a linear high refractive index cured product 22 having a relatively high refractive index in the film plane direction, and a relatively low refractive index. , It is preferable to have a louver structure in which the line-shaped low refractive index cured products 24 are alternately arranged in parallel.

Further, as shown in FIG. 4(b), the high refractive index cured product 22 and the low refractive index cured product 24 each have a predetermined thickness, and are perpendicular to the anisotropic light diffusing film 20. Even in the case, it is preferable to keep the state in which they are alternately arranged in parallel.

In addition, the high refractive index cured product is an ultraviolet cured product such as a (meth)acrylic acid ester monomer having a plurality of biphenyl rings, and although it is an example, it is preferable to set the refractive index to a value within the range of 1.5 to 1.65.

In addition, the low refractive index cured product is a polymer such as urethane (meth)acrylate, and although it is an example, it is preferable to set the weight average molecular weight to a value within the range of 3,000 to 20,000, and the refractive index is in the range of 1.4 to 1.5 It is preferable to set it as a value within.

Accordingly, 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 so as to exhibit anisotropy.

That is, as shown in Fig. 4(b), the incident angle of incident light to the anisotropic light diffusing film 20 is within a predetermined range substantially close to parallel with respect to the interface 23' of the louver structure 23. In the case of an angle (angle within the light diffusion incident angle region), the incident light rays 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, and the light exit surface The traveling direction of the light on the side is not uniform.

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

On the other hand, when the angle of incidence of the incident light 36 ′ with respect to the anisotropic light diffusing film 20 is out of the light diffusion incident angle region, the incident light 36 is not light diffused by the anisotropic light diffusing film 20. without it, it is transmitted as it is.

7. Light control member 2

Further, as a type of light control member, a light diffusion layer is formed by further laminating a different type of isotropic light diffusion film (e.g., columnar light diffusion film) on the surface of the substrate (on the side not in contact with the light diffusion layer). is also desirable

That is, by laminating the isotropic light-diffusing film on the surface of the base material (on the side not in contact with the light-diffusing layer) via an adhesive or pressure-sensitive adhesive, or by laminating the isotropic light-diffusing film directly with the light-diffusing layer instead of the base material By doing so, it can be made into a composite projection screen. This is because only in the light-diffusion layer, even if the haze value is relatively low, the haze value can be controlled to a higher value by setting it as total by the haze effect resulting from the isotropic light-diffusing film.

In addition, such a composite projection screen has an advantage that, when performance deteriorates due to exposure to external light, only the light-diffusion layer can be replaced and the relatively expensive columnar light-diffusion film can be reused.

Further, although not shown, the above-described columnar light-diffusion film has an internal structure formed by standing a plurality of columnar objects having a relatively high refractive index in a region having a relatively low refractive index in a film thickness direction. A film etc. are mentioned.

More specifically, in a cross section of the columnar light-diffusion film cut in the vertical direction, columnar objects having a relatively high refractive index and regions having a relatively low refractive index are alternately arranged with a predetermined width, respectively. It is desirable to have

From this, it is estimated that when the incident angle is within the light-diffusion incident angle region, the incident light is diffused isotropically by the light-diffusion film having a columnar structure within the film.

That is, it is assumed that the angle of incidence of incident light to the light-diffusion film having a columnar structure within the film is a value within a predetermined angular range from parallel to the interface of the columnar structure (value within the light-diffusion incident angle region).

Then, such an incident light passes through the inside of the relatively high refractive index columnar material in the columnar structure along the film thickness direction while changing the direction, so that the traveling direction of the light on the light exit surface side is not uniform.

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

On the other hand, when the angle of incidence of incident light to the light diffusion film having a columnar structure within the film is out of the light diffusion incident angle region, the incident light is not diffused by the light diffusion film and passes through the light diffusion film as it is, and the transmitted light is do.

8. Other laminated members

(1) protective film

Further, it is preferable that a protective film is laminated on the surface of the light diffusion layer in the screen on the opposite side to the base material.

The reason for this is that by laminating the protective film in this way, adhesion of contaminants to the light diffusion layer can be prevented, and handling (transportability) of the screen and reproducibility of the effects of adhesion and light diffusion can be improved. Because.

Here, as the protective film, a polyethylene film, a polypropylene film, a polyolefin film such as polymethylpentene, a polyester film such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, a polyvinylidene fluoride film, and a polytetrafluorocarbon film. At least 1 sort(s), such as a ethylene film and a silicone resin film, is mentioned.

In addition, the surface of the protective film on the side in contact with the light diffusion layer is preferably subjected to a peeling treatment with fluororesin or the like, and it is also preferable to use the film as it is without surface treatment.

Moreover, it is preferable to set it as the value normally within the range of 1-1000 micrometers as thickness of a protective film.

The reason for this is that when the protective film is excessively thin, the handleability may deteriorate or the function of protecting the light-diffusing layer may deteriorate. In addition, when the protective film is excessively thick, it is similarly difficult to handle, or it is because roll forming becomes difficult when it is stuck to the light diffusion layer of the screen.

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

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

(2) antireflection layer

Further, in the screen, it is preferable to provide an antireflection layer on the incident side of the projector.

Specifically, it is preferable to provide a plastic film or a moth-eye film coated with the anti-reflection layer (AR) or the low-reflection layer (LR).

Further, the antireflection layer differs 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 from other angles.

In addition, the anti-reflection layer and the low-reflection layer may be formed by coating a conventionally known material on the plastic film as the base material described above. It is also preferable to use a moth-eye film formed by a conventional formulation as a base material.

(3) Other

In addition, a reinforcing plate, a hard coat layer, an antistatic layer, an ultraviolet ray absorbing layer, an ultraviolet ray reflective layer, a color adjustment layer, a reflector, etc. may be provided on at least one side of the substrate as necessary within a range that does not impair the effect of the present invention. Alternatively, the function may be imparted to the substrate itself.

9. Manufacturing method

The screen according to the present embodiment can be produced, for example, in the following manner using the various materials described above.

(1) First process

A 1st process is a process of creating the coating liquid which consists of a silicone resin and organic particulates.

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

Next, the inside of the container is stirred using a stirring device until a predetermined amount of organic particulates are introduced and uniformly dispersed.

Next, with respect to the addition-type organopolysiloxane composed of a predetermined organopolysiloxane and an organohydrogenpolysiloxane, a predetermined amount of a platinum catalyst and a polyorganosiloxane containing a trifunctional or tetrafunctional siloxane unit as desired. is added, and the inside of the container is stirred using a stirrer until a uniform state is obtained.

Finally, while stirring the inside of the container, a predetermined amount of an organic solvent such as toluene or methyl ethyl ketone is further added to dilute the solid content concentration to a predetermined value (for example, 20% by weight) to obtain a coating solution.

(2) Second process

The second step is a step of applying the obtained coating solution onto 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, for the obtained silicone resin solution coating solution.

Subsequently, the coating film is heat treated under predetermined conditions, organic solvents (toluene, methyl ethyl ketone, etc.) are dispersed and dried, and the silicone resin component is reacted to form a predetermined light diffusion layer uniformly containing organic fine particles on the substrate form

The heat treatment conditions at that time vary depending on the type of silicone resin, the amount of catalyst added, etc., but usually, a heating temperature of 120 to 160 ° C. and a heating time of about 0.5 to 10 minutes are preferable, and a heating temperature of 125 to 140 ° C. It is more preferable that the heating time is about 1 to 5 minutes.

That is, through coating, drying, and the like in this manner, it is possible to obtain a stick-on type projection screen basically composed of a predetermined substrate and a predetermined light diffusion layer.

[Example]

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

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

[Example 1]

1. Fabrication of the screen

In a container equipped with a stirrer, as a silicone resin, an addition-type organopolysiloxane composed of an organopolysiloxane having a siloxane bond as a main skeleton and having a vinyl group and an organohydrogenpolysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., KS-847H) , Refractive index: 1.43) 0.03 parts by weight of a platinum catalyst (PL-50T manufactured by Shin-Etsu Chemical Industry Co., Ltd.) and crosslinked polymethyl methacrylate (PMMA ) particles (Sekisui Kaseihin Kogyo Co., Ltd., SSX-104, average particle diameter: 4 μm, refractive index: 1.49) were accommodated.

Then, 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 concentration of 20% by weight to obtain a coating solution.

Next, the obtained coating liquid was applied to the easily adhesive treated surface side of a PET film (Lumira U48, manufactured by Tore Co., Ltd., thickness: 125 μm, visible light transmittance: 89%) using an applicator, Heat treatment was performed at 130° C. for 2 minutes to obtain a screen having a light diffusion layer having a thickness of 15 μm on one side of the base material.

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

2. Screen evaluation

(1) Total light transmittance and haze value

In accordance with JIS K 7136: 2000, using an NDH-5000 (Nippon Denshoku Kogyo Co., Ltd., integrating sphere type light transmittance measuring device) as a haze meter, a screen is installed so that the light diffusion layer side is the incident light side, and the screen The haze value (soak, %) of was measured.

That is, the total light transmittance and the diffuse transmittance of the screen were respectively measured using an integrating sphere type light transmittance measuring device, and the haze value was calculated by the following formulas (2) and (3).

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

Diffuse transmittance (%) = Total light transmittance (%) - Parallel light transmittance (%) (3)

(2) adhesion

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

(3) projection

The projection property 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 it was affixed to a glass plate to obtain a sample in which the screen was affixed on the glass plate.

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

Then, the predetermined image was visually observed from the screen non-sticking surface side of the glass plate, from the normal direction (0 °) of the sample plane, or from a direction (30 °) 30 ° downward in the normal direction of the sample plane, and the projection properties, Evaluation was made according to the following criteria.

In addition, the bright environment in the following standards refers to an environment in which 800 lux is obtained when the measuring instrument is measured facing the direction of the fluorescent light at the sample position in a room where a fluorescent lamp is lit, and 400 lux is obtained when measured in the same way as the sample. On the other hand, a dark environment refers to a dark room state in which fluorescent lamps are turned off.

◎ : The image is very clear even in a bright environment.

○: The image is clearly visible even in a bright environment.

△: The image is blurry in a bright environment, but is clearly visible in a dark environment.

×: The image is blurry even in a dark environment.

(4) adhesiveness

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

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

◎: Even if it is done by hand, air can be easily discharged.

○: Air bleeding is insufficient by manual work, but air bleeding is easily possible by using a squeegee.

△: By using a squeegee, air can escape

×: Air escape is difficult

(5) Repeelability

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

That is, after evaluating the stickability of the above-described screen, it was peeled off from the glass plate, the state of the screen including the light-diffusing layer was visually observed, and the re-peelability was evaluated according to the following criteria.

◎: It can be easily peeled off from the glass plate manually, there is no deformation of the light-diffusing layer, and no air is mixed even if it is re-applied.

○: It can be peeled off from the glass plate manually, there is no deformation of the light diffusion layer, and air is not mixed by reapplying using a squeegee.

△: It can be peeled off from the glass plate, but the light diffusion layer is deformed and the air release property after laminating is reduced.

×: Unable to peel from the glass plate, or the light-diffusion layer is destroyed during peeling, and a part of the light-diffusion layer remains on the glass plate

(6) Adhesion 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 light-diffusion layer side was affixed to a glass plate to obtain a sample in which the screen was affixed on the glass plate. Ten samples were prepared in the same manner.

Then, for 10 samples, a heat cycle test in which -35°C and 70°C were alternately repeated for 30 minutes each was performed for 250 hours, and then the samples were evaluated according to the following criteria, and adhesion durability was evaluated. did. The obtained results are shown in Table 1.

◎: No peeling of the screen was observed in 10 samples.

○: Peeling of the screen was observed in 1 to 2 samples

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

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

[Examples 2-4]

In Examples 2 to 4, the influence of the blending amount of the organic particulates on the silicone resin was examined.

That is, in Example 2, the blending amount of organic particulates was 10 parts by weight, in Example 3, the blending amount of organic particulates was 15 parts by weight, and in Example 4, the blending amount of organic particulates was 1 part by weight. In the same way as in Example 1, a screen was created and haze value and the like were measured. The results obtained respectively are shown in Table 1.

[Examples 5-6]

In Examples 5 and 6, the influence of the thickness of the light diffusion layer was examined.

That is, in Example 5, the thickness of the light-diffusion layer was set to 10 μm, and in Example 6, the screen was prepared in the same manner as in Example 1, except that the thickness of the light-diffusion layer was set to 25 μm, and the haze value, etc. was measured. The results obtained respectively are shown in Table 1.

[Examples 7 to 9]

In Examples 7 to 9, the types of organic particulates to be blended with the silicone resin (including differences in average particle diameter) were examined.

That is, in Example 7, the type of organic fine particles was selected from PMMA particles (Sekisui Kaseihin Kogyo Co., Ltd., SSX-104, average particle diameter: 4 μm, refractive index: 1.49), PMMA particles (Sekisui Kaseihin Kogyo Co., Ltd.) Co., Ltd., SSX-102, average particle diameter: 2 μm, refractive index: 1.49), and in Example 8, similarly, the type of organic particulates was PMMA particles (Sekisui Kaseihin Kogyo Co., Ltd., SSX-108). , average particle diameter: 8 μm, refractive index: 1.49), and in Example 9, similarly, the type of organic particulates was cross-linked polystyrene particles (SX-350 manufactured by Soken Chemical Co., Ltd., average particle diameter: 3.5 μm, refractive index: 1.60), a screen was created and the haze value and the like were measured in the same manner as in Example 1. The results obtained respectively are shown in Table 1.

[Example 10]

In Example 10, a stick-on composite projection screen comprising a light control member having an anisotropic light diffusing property provided between the base material and the light diffusing layer was created, and the effect thereof was examined.

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

In addition, this anisotropic light-diffusing film was created according to the following procedure.

<Preparation of composition for anisotropic light-diffusing film>

In a container equipped with a stirrer, polypropylene glycol, isophorone diisocyanate, and 2-hydroxyethyl methacrylate were reacted to form polyether urethane methacrylate having a weight average molecular weight of 9,900 (refractive index at 589 nm: 1.46 ) was obtained.

Next, with respect to 100 parts by weight of the obtained polyether urethane methacrylate, o-phenylphenoxyethoxyethyl acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester A-LEN-10; refractive index at a wavelength of 589 nm 1.58 ) After adding 100 parts by weight and 5 parts by weight of 2-hydroxy-2-methylpropiophenone as a photopolymerization initiator, they were mixed until uniform under conditions of 80°C to obtain a composition for an anisotropic light-diffusing film. .

<Application of Composition for Anisotropic Light-Diffusing Film>

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

<Curing of photocurable resin layer>

Subsequently, a laminate composed of the obtained PET film and the photocurable resin layer is installed on a conveyor so that the PET film side is in contact with it, and an ultraviolet irradiation device (Igraphix ( Co., Ltd., ECS-4011GX) was installed so that the angle formed by the flow direction of the conveyor and the longitudinal direction of the UV lamp on the ship was a right angle. In addition, the ultraviolet irradiation device and even the conveyor portion corresponding to it are boxed so that outside light does not enter, and ultraviolet rays emitted from the ultraviolet irradiation device are substantially parallel in the flow direction of the conveyor (the flow direction of the photocurable resin layer). The irradiation width of ultraviolet rays in the flow direction of the photocurable resin layer was adjusted using two light-shielding plates as much as possible. At this time, the ultraviolet rays irradiated to the surface of the photocurable resin layer, when the normal direction of the photocurable resin layer is set at 0 ° when viewed from the longitudinal direction of the linear ultraviolet lamp, direct irradiation of ultraviolet rays from the lamp The angle was set to be 30°. In addition, the ultraviolet lamp was installed so that the angle formed by the longitudinal direction and the longitudinal direction of the above laminate was a right angle.

Then, while irradiating ultraviolet rays in an air atmosphere so that 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 laminate is moved in the longitudinal direction by a conveyor at 0.2 m/min. moved at a speed of

<Post-processing>

Next, a release film (SP-PET382050, manufactured by Lintec Co., Ltd.) was laminated on the surface of the photocurable resin layer, and ultraviolet irradiation was performed under the same conditions as in the above step except for that.

As a result, an anisotropic light-diffusing film having a total thickness of 200 μm, an inclination angle of the cured product on the cross-sectional line of 22° (the normal direction of the film plane is 0°), and a louver structure in the thickness direction of 165 μm was obtained. In addition, the total thickness was measured with a static pressure thickness measuring instrument (Tekrok PG-02J, manufactured by Takara Seisakusho Co., Ltd.), and the inclination angle and length of the cured product on the cross-sectional line were measured based on electron micrographs.

Next, the prepared anisotropic light diffusing film was peeled off from the process sheet, and the exposed surface was attached to the substrate side of the screen obtained in Example 2 with a commercially available acrylic adhesive, thereby forming an anisotropic light diffusing film and a substrate. (PET film) and a light diffusion layer were laminated in this order to produce a stick-on composite projection screen.

And various tests, such as a haze value, peeled off the peeling film on an anisotropic light-diffusing film, and measured similarly to Example 1.

However, for the evaluation of the projection property of the screen, the angle of inclination between the light beam of the projector and the cured material on the cross-sectional line is the shallowest angle (the direction of irradiation of ultraviolet rays during the production of the anisotropic light-diffusing film and the direction of irradiation of the projector's rays are substantially coincident). direction) It performed by adjusting the top, bottom, left and right of the laminated body of a screen and glass. The obtained results are shown in Table 1.

[Comparative Example 1]

In Comparative Example 1, a screen was created in the same manner as in Example 1, except that no organic particulates were blended into the silicone resin in the light-diffusing layer, that is, the blending amount was 0 parts by weight, and the haze value and the like were adjusted. Measured. The obtained results are shown in Table 1.

[Comparative Example 2]

In Comparative Example 2, except that the blending amount of the organic particulates relative to the silicone resin in the light-diffusing layer was 17 parts by weight, a screen was created and the haze value and the like were measured in the same manner as in Example 1. The obtained results are shown in Table 1.

[Comparative Example 3]

In Comparative Example 3, the type of organic particulates in the light diffusion layer was SSX-104 and Tospar 145 (manufactured by Tore Co., Ltd., average particle size: 4.5 μm, refractive index: 1.43), and the blending amount was 5 parts by weight. Except for the above, a screen was created and haze value and the like were measured in the same manner as in Example 1. The obtained results are shown in Table 1.

[Comparative Example 4]

In a container equipped with a stirrer, trimethylolpropane-modified xylylene diisocyanate (small 0.2 parts by weight of Kengaku Co., Ltd., product name TD-75), 0.2 parts by weight of 3-glycidoxypropyltrimethoxysilane (Shin-Etsu Chemical Co., Ltd., product name KBM-403), and PMMA particles (Seki SSX-104 manufactured by Suika Seihin Kogyo Co., Ltd., average particle diameter: 4 μm, refractive index: 1.49) 3 parts by weight were received and mixed in ethyl acetate to obtain a coating solution.

Next, the obtained coating solution was applied to the adhesion easily treated surface side of a PET film (Lumira U48, manufactured by Toray Co., Ltd., thickness: 125 μm), followed by heat treatment at 90° C. for 1 minute, and then at room temperature Ha, it was cured for 1 week. In this way, a screen was created in which a light diffusion layer made of acrylic resin and having a thickness of 15 μm was provided on one side of the base material.

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

[Comparative Example 5]

In Comparative Example 5, except that the type of fine particles was set to SSX-104 and Tospar 145 (manufactured by Tore Co., Ltd., average particle diameter: 4.5 µm, refractive index: 1.43), and the blending amount of fine particles was 4.45 parts by weight. , According to Comparative Example 4, a screen was created and haze value and the like were measured. The obtained results are shown in Table 1.

[Table 1]

10: Attached projection screen (screen)
12: materials
14: light diffusion layer
14a: silicone resin
14b: organic fine particles
16: release film
18: Adhesion (window glass, showcase, etc.)
20: light control member (anisotropic light diffusing film)
21: adhesive composite projection screen
22: high refractive index cured material
23: louver structure
24: low refractive index cured material
36: incident light

Claims (8)

It is composed of a substrate and a light diffusion layer,
The light diffusion layer contains a silicone resin and organic particulates having an average particle diameter of 1 to 10 μm,
The thickness of the light diffusion layer is set to a value within the range of 5 to 30 μm,
The 180 ° peel force measured in accordance with JIS Z 0237: 2009 on the light diffusion layer side is a value within the range of 20 to 200 mN / 25 mm, and
An adhesive projection screen characterized in that the haze value measured in accordance with JIS K 7136:2000 is a value of 20% or more. According to claim 1,
A stick-on projection screen characterized in that the compounding amount of the organic particulate is within a range of 1 to 15 parts by weight based on 100 parts by weight of the silicone resin. According to claim 1 or 2,
When the thickness of the light diffusion layer is t (μm), the average particle diameter of the organic particulates is φ (μm), and the blending amount of the organic particulates is A (parts by weight), the effect expressed by t / φ × A A stick-on projection screen characterized in that the factor is set to a value within the range of 3 to 100. According to claim 1 or 2,
A stick-on projection screen characterized in that a difference in refractive index between the silicone resin and the organic fine particles is 0.02 or more. According to claim 1 or 2,
A stick-on projection screen, characterized in that the thickness of the substrate is in the range of 50 to 250 μm. According to claim 1 or 2,
A stick-on projection screen characterized in that the heat shrinkage of the base material is set to a value of 2% or less in any one of the MD direction and the TD direction after heating at 150°C for 1 hour. According to claim 1 or 2,
A stick-on projection screen, characterized in that a light control member having an anisotropic light diffusing property or an isotropic light diffusing property is further provided on one of the front and back surfaces of the substrate. According to claim 1 or 2,
A stick-on projection screen characterized in that a protective film is laminated on a surface of the light diffusion layer opposite to the base material.

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