JP2020116839A - Writable screen resin composition, writable screen using the same, and method for manufacturing the same - Google Patents

Abstract

To provide a writable screen resin composition capable of improving a writing function relating to writability and erasability when using a whiteboard marker or a whiteboard eraser and a projection function relating to prevention or reduction of hot spots and glare in a well-balanced manner, and a writable screen using the same, and a method for manufacturing the same.SOLUTION: The writable screen resin composition of the present invention contains an ultraviolet curable resin and a solventless reactive silicone. The content of the solventless reactive silicone is 0.5 to 10 pts.wt. with respect to 100 pts.wt. of the ultraviolet curable resin. The writable screen of the present invention can be manufactured by disposing the resin composition on a base material layer and irradiating the resin composition arranged on the base material layer with ultraviolet rays.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resin composition for a writable screen, a writable screen using the writable screen, and a method for producing the same, and more specifically, a writable screen having improved projection projection properties and erasability after writing with a marker. The present invention relates to a resin composition for use, a writable screen using the same, and a method for producing the same.

In recent years, it has the function of a projection screen for projecting characters, photographs, figures, etc. emitted from a projector connected to an information machine device such as a personal computer, a tablet terminal, a smartphone, or a communication machine device, and by using a whiteboard marker or the like. There are known screens that can be written to and erased by a whiteboard eraser. Such a screen is also called a writable screen.

In conventional projection screens, unevenness is created on the surface of the screen by embossing the surface material and kneading fine particles to diffuse the projection light from the projector, thereby suppressing glare of light called hot spots. The viewing angle is being expanded.

On the other hand, a writable screen which is free from hot spots and glare during use and has a well-balanced writability, erasability, and scratch resistance after long-term use has not yet been found to be satisfactory.

For example, in Patent Document 1, an ultraviolet curable resin is applied and cured on the surface of a polyethylene terephthalate resin film, and the cured coating film surface is embossed to have an arithmetic average roughness of 1.5 to 3.0 μm and an average. A screen provided with unevenness having a mountain interval of about 50 to 280 μm has been proposed. The screen of Patent Document 1 is intended to improve the erasability of characters written with a whiteboard marker.

In Patent Document 2, a resin layer containing fine particles is provided on a base material, and an arithmetic mean roughness Ra1 (cutoff value 0.8 mm, stylus tip radius 2.5 μm JIS B0601 (2001) on a writing and projection surface is provided. ) Is 0.1 to 3.0 μm, and Ra2 (cutoff value 0.08 mm, stylus tip radius 2.5 μm in JIS B0601 (2001)) on the writing and projection plane. A writable screen having an arithmetic average roughness of the surface of 0.05 to 0.20 μm is described. The screen of Patent Document 2 aims to improve hot spots and glare, in addition to improving writing and erasability.

Patent Document 3 describes a projection screen prepared by applying and curing an ultraviolet curable resin containing fine particles having an average particle diameter of 2 to 12 μm on a thermoplastic resin substrate. According to Patent Document 3, the addition of a fluorine-based or silicone-based compound to this UV-curable resin causes the cured surface to have a gloss (60 degree surface gloss) of about 3 to 38, which improves hot spots and erasability. Is described.

However, all of the screens described in Patent Documents 1 to 3 can be expected to have a corresponding improvement effect which is intended by each of the Patent Documents, but a note on writability and erasability when using a whiteboard marker or a whiteboard eraser. It is hard to say that the function and the projection function for preventing or reducing hot spots and glare can be improved in a balanced manner. Therefore, further development of a writable screen is desired.

International Publication No. 01/032440 International Publication No. 2013/137099 JP, 2018-54809, A

The present invention is intended to solve the above problems, and an object thereof is to provide a writing function regarding writability and erasability when using a whiteboard marker or a whiteboard eraser, and a hotspot and a glare. It is intended to provide a resin composition for a writable screen, a writable screen using the same, and a method for producing the same, which can improve the projection function for prevention or reduction of the above in a well-balanced manner.

The present invention contains an ultraviolet curable resin and a solventless reactive silicone, and the content of the solventless reactive silicone is 0.5 to 10 parts by weight with respect to 100 parts by weight of the ultraviolet curable resin. A resin composition for a writable screen.

In one embodiment, the content of the solventless reactive silicone is 1 to 8 parts by weight based on 100 parts by weight of the ultraviolet curable resin.

In one embodiment, the solventless reactive silicone is a polysiloxane modified with acrylic or methacrylic acid groups.

The present invention is also a writable screen having a resin layer on a base material layer, wherein the resin layer is composed of a cured product of the above resin composition for a writable screen.

In one embodiment, the arithmetic average roughness Ra of the resin layer is 0.3 to 0.8 μm.

In one embodiment, the adjacent unevenness average distance Sm of the resin layer is 40 to 80 μm.

The present invention is a method of manufacturing a writable screen,
A step of disposing the resin composition for a writing screen on a base material layer, and a step of irradiating the resin composition arranged on the base material layer with ultraviolet rays;
Including the method.

According to the present invention, writability and erasability by a whiteboard marker or a whiteboard eraser can be compatible with prevention or reduction of hot spots and glare. The writable screen of the present invention is also excellent in scratch resistance against the markers and the eraser because the screen surface (resin layer side surface) has good strength.

It is a schematic sectional drawing which shows an example of the writable screen of this invention.

Hereinafter, the present invention will be described in detail.

(Writable screen resin composition)
The writable screen resin composition of the present invention contains an ultraviolet curable resin and a solventless reactive silicone.

The ultraviolet curable resin in the present invention is a monomer or oligomer having a property of causing a polymerization reaction to solidify upon irradiation with light (particularly ultraviolet light). For example, it has a property of causing radical polymerization of an unsaturated double bond upon irradiation with light. Examples thereof include those having (acrylate type ultraviolet curable resin) and those having the property of causing cationic polymerization by light irradiation (epoxy type ultraviolet curable resin). Specific examples of such an ultraviolet-curable resin include epoxy-modified acrylate-based, urethane-modified acrylate-based, silicone-modified acrylate-based, and epoxy-based, and fluorine-modified oligomers or monomers thereof, or known photopolymerization initiators. Examples of the resin include an agent.

Examples of the ultraviolet curable resin include UV curable resin "Shikko (registered trademark)" series (for example, UV-1700B, UV-7510B, UV-7640B, UV-7605B) manufactured by Nippon Synthetic Chemical Industry Co., Ltd. and the like. ..

Solvent-free reactive silicone is a silicone oil in which a reactive functional group is introduced into a part of silicon atoms constituting the silicone, and when combined with the ultraviolet curable resin, the resin is cured by ultraviolet rays. It is a material that can give the properties of silicone oil when it is applied. Such solvent-free reactive silicones include, for example, those in which a reactive functional group is added to one end of a molecule constituting a polysiloxane (one-end reactive silicone), and those of a molecule constituting a polysiloxane. Examples thereof include those in which a side chain is provided with a reactive functional group (side chain type reactive silicone), and combinations thereof. The one-end reactive silicone can be graft-copolymerized with a resin (ultraviolet curable resin), for example, and can impart water repellency and slipperiness to the resin surface. The side chain type reactive silicone can be randomly copolymerized with, for example, a resin (ultraviolet curable resin), and can impart water repellency and slipperiness to the resin surface.

Examples of the reactive functional group constituting the one-terminal type reactive silicone and/or the side chain type reactive silicone include an amino group, a diamino group, an epoxy group, an alicyclic epoxy group, a carbinol group, a mercapto group, Included are carboxyl groups, diol groups, acrylic groups, and methacrylic groups, and combinations thereof. Solvent-free reactive silicones have the ability to provide good writing capabilities (eg, whiteboard markers or whiteboard eraser writability and erasability) to the resulting screens, and thus are suitable for use with acrylic or methacrylic acid groups. It is preferably a polysiloxane modified with a group, and a polysiloxane molecule modified with an acrylic acid group or a methacrylic acid group at one end thereof (reactive silicone having one end) is preferable. More preferable.

Solvent-free reactive silicones are commercially available, for example, from Shin-Etsu Silicone Co., Ltd. in the "Shin-Etsu Silicone Oil X-22-174" series, and Shin-Etsu Silicone Oil X-22-174BX is particularly preferable.

The content of the solvent-free reactive silicone in the resin composition of the present invention is 0.5 to 10 parts by weight, preferably 1 to 8 parts by weight, based on 100 parts by weight of the ultraviolet curable resin. Is. If the content of the solvent-free reactive silicone is less than 0.5 part by weight, the erasability and/or slipperiness of the obtained screen by the board eraser may deteriorate. When the content of the solventless reactive silicone is more than 10 parts by weight, dispersibility at the time of blending with the ultraviolet curable resin is lowered, and it may be difficult to obtain a homogeneous resin composition.

Fine particles may be added to the resin composition of the present invention in order to further improve both the writing function and the projection function of the resulting screen. Examples of such fine particles include organic materials (for example, thermoplastic resins such as polyethylene, polypropylene, and acrylic resins), and inorganic materials (for example, glass, silica, alumina, titanium compounds, zirconium compounds), and those. The combination of The average particle size and content of the fine particles are not particularly limited, and those skilled in the art can select an appropriate average particle size and amount.

The resin composition of the present invention may contain other additives as required. Examples of such other additives include antioxidants (eg phenolic antioxidants, sulfur antioxidants and/or phosphorus antioxidants); antistatic agents (eg anionic activators). , Cationic active agents, nonionic active agents, and/or amphoteric active agents); lubricants (for example, hydrocarbon lubricants, fatty acid lubricants, higher alcohol lubricants, fatty acid amide lubricants, metal soap lubricants, and And/or ester lubricants; and flame retardants (eg, organic flame retardants and/or inorganic flame retardants); and combinations thereof. The content of the above-mentioned other additives that can be contained in the present invention is not particularly limited, and an arbitrary amount can be selected by those skilled in the art.

(Writable screen)
The writable screen of the present invention has a resin layer on the base material layer.

FIG. 1 is a schematic sectional view showing an example of the writable screen of the present invention. In the screen 100 of FIG. 1, the resin layer 120 is arranged on one surface of the base material layer 110. In FIG. 1, the resin layer 120 is arranged so as to be in direct contact with the base material layer 110, but the present invention is not limited to such an embodiment. For example, an adhesive layer may be provided between the resin layer 120 and the base material layer 110 using a material described below.

Examples of the material forming the base material layer include paper (eg, paperboard, western paper, Japanese paper), synthetic paper, cloth (eg, woven cloth, knitted cloth, non-woven cloth), and synthetic resin sheets or films, and these. The laminated body of is mentioned. From the viewpoint of constituting a screen, at least one surface of the base material layer (that is, the surface on the side where the resin layer 120 is arranged among the surfaces forming the base material layer 110 in FIG. 1) is white. It is preferable to present.

In the present invention, a sheet or film made of a synthetic resin is preferable among the materials constituting the base material layer because it has good durability and flatness. Further, the synthetic resin sheet or film is preferably a white polyester resin sheet or film, because it has good strength, dimensional stability, heat resistance, etc., and is a white biaxially stretched polyester film. Is more preferable. Examples of such a white biaxially stretched polyester film include DIAFOIL W400J manufactured by Mitsubishi Chemical Corporation, Lumirror E28G manufactured by Toray Co., Ltd., Teijin (registered trademark) Tetron (registered trademark) film U292W manufactured by Teijin Film Solutions Ltd., Toyobo. Crisper K2323 manufactured by Co., Ltd. is commercially available.

The thickness of the base material layer in the writable screen of the present invention is not necessarily limited, but is, for example, 25 μm to 250 μm, more preferably 75 μm to 200 μm. When the thickness of the base material layer is less than 25 μm, sufficient strength cannot be imparted to the obtained screen, and the screen may be easily damaged during use (for example, when erasing characters with a board eraser). When the thickness of the base material layer exceeds 250 μm, there is no change in the desired improvement of the writing function and the projection function, and rather the weight of the obtained screen itself may be heavy.

On the other hand, in the present invention, the material constituting the resin layer is composed of a cured product of the above-described writable screen resin composition of the present invention. The cured product is obtained by curing the resin composition for a writable screen of the present invention by irradiation with light (for example, ultraviolet rays). The resin layer is provided with appropriate water repellency and slipperiness on its surface by the useless type reactive silicone contained in the resin composition.

In the writable screen of the present invention, the surface of the resin layer (particularly the surface of the resin layer 120 shown in FIG. 1 opposite to the surface in contact with the base material layer 110) has a predetermined arithmetic average roughness Ra value. Preferably. The arithmetic average roughness Ra is measured according to JIS B0601 (2001). In the writable screen of the present invention, the arithmetic average roughness Ra of the resin layer is preferably 0.3 μm to 0.8 μm, more preferably 0.5 μm to 0.7 μm. If the arithmetic average roughness Ra of the resin layer is less than 0.3 μm, hot spots or glare may occur on the obtained screen, and the antiglare property may be deteriorated. If the arithmetic average roughness Ra of the resin layer exceeds 0.8 μm, the erasability of the board eraser may be reduced.

In the writable screen of the present invention, the surface of the resin layer (particularly the surface of the resin layer 120 shown in FIG. 1 opposite to the surface in contact with the base material layer 110) has a predetermined average distance between adjacent convex portions (surface roughness). It is also preferable to have a value of Sm. The average spacing Sm between adjacent convex portions is measured according to JIS B0601 (2001). In the writable screen of the present invention, the average spacing Sm between adjacent convex portions of the resin layer is preferably 40 μm to 80 μm, more preferably 50 μm to 70 μm. If the average spacing Sm between adjacent convex portions of the resin layer is less than 40 μm, the erasability of the board eraser may deteriorate. If the average spacing Sm between adjacent convex portions of the resin layer exceeds 80 μm, the antiglare property may deteriorate.

The thickness of the resin layer in the writable screen of the present invention is not necessarily limited, but is, for example, 2 μm to 50 μm, more preferably 5 μm to 20 μm. When the thickness of the resin layer is less than 2 μm, it may be difficult to maintain the uniformity of coating (that is, to arrange the resin layer on the base material layer with a substantially uniform thickness). If the thickness of the resin layer exceeds 50 μm, the obtained screen may curl.

In the writable screen of the present invention, when the adhesive layer is arranged between the base material layer and the resin layer, the material forming the adhesive layer is not particularly limited, and a material known in the art can be adopted. The thickness of the adhesive layer is also not particularly limited, and a person skilled in the art can select an appropriate thickness.

In the writable screen of the present invention, another layer such as a magnet sheet is provided on the other surface of the base material layer, that is, the surface opposite to the surface in contact with the resin layer, for example, via an adhesive layer. May be. When the writable screen of the present invention is provided with the magnet sheet, the writable screen of the present invention can be easily installed and removed at a predetermined place such as a blackboard or a metal partition. Such magnet sheets are commercially available.

The writable screen of the present invention is manufactured, for example, as follows.

First, the resin composition for a writable screen of the present invention is placed on the base material layer.

Specifically, the resin composition for a writable screen containing the ultraviolet curable resin and the solventless reactive silicone is applied to one surface of the material constituting the base material layer, for example, in the form of a uniform mixture. To be done. The application of the resin composition for a writable screen to the base material layer is performed by a means known in the art, for example, by coating or spraying.

After the placement of the resin composition for a writable screen on the base material layer, the surface on which the resin composition for a writable screen is placed, diffusely reflects the projection light emitted from the projector on the obtained screen surface. Accordingly, in order to prevent the occurrence of hot spots, embossing may be performed in order to impart predetermined unevenness or a physical shape. Means known in the art can be used for this embossing.

Thereby, the resin composition for a writable screen of the present invention is arranged on the base material layer.

In the present invention, next, the resin composition arranged on the base material layer is irradiated with ultraviolet rays.

Irradiation with ultraviolet rays is performed using a means known in the art, for example, an ultraviolet device provided with a UV light source. Types of UV light sources that can be used in the present invention include, for example, lamps such as mercury lamps, metal halide lamps, high efficiency metal halide lamps, and high power metal halide lamps; and LED lights. In the present invention, the ultraviolet rays to be irradiated preferably have an emission wavelength of 254 nm and/or 365 nm, and the irradiation time varies depending on the type and output of the UV light source used and is not necessarily limited. Upon irradiation with ultraviolet rays, the resin composition for a writable screen forms a resin layer as a cured product on the base material layer.

In this way, the writable screen of the present invention is manufactured.

The writable screen of the present invention can be freely written on the resin layer using, for example, a commercially available marker for whiteboard. Further, if a commercially available whiteboard eraser is used, the written character or figure can be easily erased. In addition, the writable screen of the present invention can project light emitted from the projector onto the resin layer while preventing or reducing hot spots and glare. As described above, the writable screen of the present invention is excellent in both the writing function and the projection function, and both functions are improved in a well-balanced manner as compared with the conventional screen.

The writable screen of the present invention is useful in various facilities such as offices, schools or educational facilities, libraries, hospitals, conference rooms, exhibition halls, theaters, concert halls, commercial facilities, airports, and public offices.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

(Screen evaluation)
The screens produced or obtained in the following examples and comparative examples were evaluated for the following evaluation items.

(1) Writability With respect to the screens produced or obtained in the examples and comparative examples, the ease of writing was confirmed by five panelists by drawing a straight line having a length of about 10 cm with a marker for whiteboard on the screen surface. After that, all panelists consulted and judged according to the following criteria:
"○": A straight line could be drawn smoothly without any break in the marker.
“△”・・・I was able to draw a straight line without any breaks in the marker, but I felt some roughness.
“×”…The marker slipped badly and the straight line was broken, and it was necessary to redraw it.

(2) Erasability A commercially available whiteboard marker was used to draw five straight lines of about 10 cm on the surface (resin layer side surface) of the screens produced or obtained in Examples and Comparative Examples, and the temperature was about 25°C. Left in the room for 5 minutes. After that, these 5 straight lines were rubbed with a commercially available whiteboard eraser, and the ease of erasing the ink attached with the markers was confirmed by 5 panelists. After that, all panelists discussed and judged according to the following criteria. went:
"○"... The ink could be completely erased by rubbing it several times without applying force.
“A”: Ink was left unerased by rubbing several times without applying force, but it could be erased by further rubbing.
“×”: The ink could not be erased by rubbing it without applying force, and it was finally possible to erase it by rubbing it with force.

(3) Surface Lubricity A hard PVC melamine foam (5×5×5 cm ³ ; foam) having a length of about 10 cm is formed on the surface (resin layer side surface) of the screens produced or obtained in Examples and Comparative Examples. The smoothness of the foam on the screen surface when the straight line of the book was drawn was confirmed by 5 panelists, and then all panelists discussed and judged according to the following criteria:
"○"... The foam could be moved smoothly.
"A": The slip of the foam was slightly rough.
“×”: I felt a lot of roughness on the slip of the foam.

(4) Contamination residue property A screen sample cut into 10 cm x 10 cm is placed on a flat surface so that the resin layer faces upward, and an arbitrary line is drawn on the screen surface (surface on the resin layer side) with a commercially available whiteboard marker, Immediately after that, the panelist rubbed the whiteboard eraser 5 times back and forth to erase, and even if stain remained, the marker line drawing and erasure were repeated 20 times, and the condition of stain remaining on the screen was visually evaluated. It was judged by 5 grades (1 point to 5 points), with 1 point indicating that the stain remained deep and 5 points indicating that the stain did not remain at all. This was performed by five panelists, the scores of the panelists were totaled, and the average value was calculated.

(5) Surface gloss (gloss; 60 degree specular gloss)
With respect to the screens produced or obtained in Examples and Comparative Examples, the surface glossiness (60 degree specular glossiness) of the screen surface (resin layer side surface) was measured according to JIS Z8741 (1997).

(6) Arithmetic mean roughness (Ra)
With respect to the screens produced or obtained in Examples and Comparative Examples, the arithmetic average roughness (Ra) on the screen surface (resin layer side surface) was measured according to JIS B0601 (2001).

(7) Average distance between adjacent irregularities (Sm)
With respect to the screens produced or obtained in Examples and Comparative Examples, the average concavo-convex spacing (Sm) on the screen surface (resin layer side surface) was measured according to JIS B0601 (2001).

(8) Hot Spots Regarding the screens produced or obtained in Examples and Comparative Examples, the screen surface (resin layer side surface) was irradiated with white light by a monofocal projector (VX425NXGA manufactured by Panasonic Corporation) to determine whether or not there were hot spots. Was visually confirmed by five panelists, and then all panelists consulted to make a judgment based on the following criteria:
"○"... No hot spot was observed.
"A": A few hot spots were observed, but it was judged to be practical.
"X"... A hot spot was observed, and it was judged that it was not practical.

(9) Glittering With respect to the screens produced or obtained in Examples and Comparative Examples, the screen surface (resin layer side surface) was irradiated with white light by a monofocal projector (VX425NXGA manufactured by Panasonic Corporation) to determine whether there was glare. Was visually confirmed by five panelists, and then all panelists consulted to make a judgment based on the following criteria:
"○"... No glare was observed.
"A": A slight glare was observed, but it was judged that it could be put to practical use.
"X"... Glittering was observed, and it was judged that it was not practical.

(Example 1)
1 part by weight of a solventless reactive silicone (X-22-174BX manufactured by Shin-Etsu Chemical Co., Ltd.) was added to 100 parts by weight of an ultraviolet curable resin (manufactured by Nippon Gosei Co., Ltd., Shiko (registered trademark) UV-7510B). A resin composition (E1) was obtained. Next, this resin composition (E1) was applied as a base material layer to a white biaxially stretched polyethylene terephthalate film (Lumirror E28G manufactured by Toray Industries, Inc.) having a thickness of 125 μm and having easy double-sided adhesion (anchor coat treatment). , A commercially available textured sheet (A) is pressed at a pressure of 0.3 MPa, ultraviolet rays are irradiated (irradiation condition: 1700 mJ/cm ² ), the textured sheet is peeled off, and a white biaxially stretched polyethylene terephthalate film is formed. A 10 μm-thick coating film (resin layer) was formed on the top to prepare a screen (ES1). The arithmetic average roughness Ra of this resin layer was 0.3 μm. Table 1 shows the evaluation results of the obtained screen (ES1).

(Examples 2 to 4)
As the base material layer, a white biaxially stretched polyethylene terephthalate film (diamond W400J manufactured by Mitsubishi Chemical Co., Ltd.) having a thickness of 125 μm and having easy double-sided adhesion (anchored) was used, and a commercially available textured sheet (B) To (D), the base material layer is processed in the same manner as in Example 1 except that the arithmetic mean roughness Ra of the resin layer subjected to the processing is set as shown in Table 1. The resin composition (E1) was applied on the above, and screens (ES2) to (ES4) were produced in the same manner as in Example 1. Table 1 shows the evaluation results of the obtained screens (ES2) to (ES4).

(Comparative Example 1)
A screen (CS1) was produced in the same manner as in Example 1 except that the solventless reactive silicone was not used. Table 1 shows the evaluation results of the obtained screen (CS1).

(Comparative example 2)
Preparation of a resin composition in the same manner as in Example 1 except that 1 part by weight of a solvent-free non-reactive silicone (non-reactive KF640 manufactured by Shin-Etsu Chemical Co., Ltd.) was used in place of the solvent-free reactive silicone. Tried. Although the dispersibility of silicone was poor and a homogeneous resin composition could not be obtained, a screen (CS2) was produced in the same manner as in Example 1 except that the resin composition was used. Table 1 shows the evaluation results of the obtained screen (CS2).

As shown in Table 1, the screens (ES1), (ES2), (ES3) and (ES4) obtained in Examples 1 to 4 were screens of Comparative Examples 1 and 2 in almost all of the evaluation items of the screen. It can be seen that it was equivalent to or better than (CS1) and (CS2), and was a comprehensively excellent writable screen.

INDUSTRIAL APPLICABILITY According to the present invention, it is useful, for example, in the fields of office machine manufacturing, resin molding, and the like.

100 Writable screen 110 Base material layer 120 Resin layer

Claims (7)

A writable screen containing an ultraviolet curable resin and a solventless reactive silicone, wherein the content of the solventless reactive silicone is 0.5 to 10 parts by weight with respect to 100 parts by weight of the ultraviolet curable resin. Resin composition. The resin composition for a writable screen according to claim 1, wherein the content of the solventless reactive silicone is 1 to 8 parts by weight with respect to 100 parts by weight of the ultraviolet curable resin. The resin composition for a writable screen according to claim 1 or 2, wherein the solventless reactive silicone is a polysiloxane modified with an acrylic acid group or a methacrylic acid group. A writable screen having a resin layer on a base material layer, the resin layer comprising a cured product of the resin composition for a writable screen according to any one of claims 1 to 3. screen. The writable screen according to claim 4, wherein the arithmetic average roughness Ra of the resin layer is 0.3 to 0.8 μm. The writable screen according to claim 4 or 5, wherein an average concavo-convex spacing Sm of the resin layer is 40 to 80 µm. A method of manufacturing a writable screen,
A step of disposing the resin composition for a writable screen according to any one of claims 1 to 3 on a base material layer, and a step of irradiating the resin composition arranged on the base material layer with ultraviolet rays,
Including the method.

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