JP2006141206A - Insecticidal sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an insecticidal sheet that covers a light source so as to prevent insects from swarming on a light source, looks an uncolored natural color tone for human eyes, neither diffuses nor transmits light from the light source and has shielding properties. <P>SOLUTION: The insecticidal sheet has ≥95% haze, ≥0.5μm average roughness (Rz) of ten points on the surface, ≤1% light transmittance (T<SB>A</SB>) at 300-800nm(A), 50-80% light transmittance (T<SB>B</SB>) at 450-800nm(B), absorption maximum peak (P) at 530-620nm maximum absorption wavelength (λ<SB>P</SB>) and light transmittance (T<SB>P</SB>) at the wavelength (λ<SB>P</SB>) being ≤0.98 maximum light transmittance (T<SB>Bmax</SB>) at 450-700nm (B). The insecticidal sheet comprises a resin composition that comprises a transparent resin such as an acrylic resin, an ultraviolet light absorber at 350-370nm maximum absorption wavelength (λ<SB>UVmax</SB>), a colorant at 530-620nm maximum absorption wavelength (λ<SB>VISmax</SB>) and a light diffusing agent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a sheet, and more particularly to an insect-proof sheet that can prevent insects from being attracted to the light source by covering the light source.

Insects have the ability to travel toward ultraviolet light, so they gather at night by being attracted by a light source that emits light of this wavelength, such as a white fluorescent lamp.

In order to prevent insects from being attracted to the light source, an insect-proof sheet that shields light of the wavelength to which insects react most sensitively and transmits most other light, for example, visible light has been proposed. . For example, Patent Document 1 (JP 55-023921 A) proposes a sheet having a light transmittance of 1% or less at a wavelength of 300 to 380 nm and 80% or more at a wavelength of 420 to 700 nm. The sheet specifically proposed in this document has a light transmittance of 40% to 70% at a wavelength of 400 to 410 nm and no absorption maximum peak at a wavelength of 420 to 700 nm (see page 8 of Patent Document 1). (Fig. 1), the human eye looks almost colorless, and the light from the light source seen through it looks natural.

However, since the sheet disclosed specifically in the same document has a light transmittance of 40% to 70% at a wavelength of 400 to 410 nm, there is a problem that insects that react to light in this wavelength range gather. was there.

In order to solve this problem, Patent Document 2 (Japanese Patent Laid-Open No. Sho 62-278931) discloses that the light transmittance at a wavelength of 300 to 380 nm is 1% or less and the light transmittance at a wavelength of 400 to 480 nm is 30%. %, And a light transmittance of a wavelength of 580 to 700 nm is proposed to be 80% or more. Specifically, a sheet having no absorption maximum peak at a wavelength of 580 to 700 nm is disclosed [Patents] FIG. 3 on page 9 of document 2]. Since such a sheet has a light transmittance of 400 to 410 nm of 30% or less, it is possible to prevent insects that also react to light in this wavelength range from being attracted and gathered.

However, the sheet specifically proposed in this document has a problem in that it appears colored to human eyes, and light from a light source that passes through the sheet looks unnatural.

Insect-proof sheets, such as lighting covers that cover light sources, are also required to have diffuse permeability that allows light to pass through while diffusing, and also have shielding properties that prevent the light source image from being seen through. Is also sought.

JP 55-023921 A JP-A-62-278931

Therefore, the present inventor can prevent insects from flocking to the light source by covering the light source, it looks like a natural color that is not colored to the human eye, diffuses and transmits light from the light source, and As a result of intensive studies to develop a sheet having shielding properties, the haze is 95% or more, the surface 10-point average roughness (Rz) is 0.5 μm or more, and the light absorption rate at a wavelength of 300 to 410 nm. 1% or less, the light transmittance at a wavelength of 450 nm to 800 nm is 50% to 80%, and there is an absorption maximum peak at a maximum absorption wavelength of 530 to 620 nm in this wavelength range, and the light transmittance at this maximum absorption wavelength is Sheets with a maximum light transmittance of 0.98 times or less at a wavelength of 450 nm to 700 nm diffuse and transmit the transmitted light, and there are few insects gathering, and human eyes are hardly colored. As a result, the present invention has been found.

That is, in the present invention, the haze is 95% or more, the ten-point average roughness (Rz) of the sheet surface is 0.5 μm or more, and the light transmittance (T _A ) is in the wavelength range (A) of 300 nm to 410 nm. The absorption maximum peak (P) is 1% or less, the light transmittance (T _B ) is 40% to 70% in the wavelength range (B) of 450 nm to 800 nm, and the maximum absorption wavelength (λ _P ) is 530 nm to 620 nm. And the light transmittance (T _P ) at the maximum absorption wavelength (λ _P ) is 0.98 times or less of the maximum light transmittance (T _Bmax ) in the wavelength range (B) of 450 nm to 700 nm. The sheet | seat characterized by this is provided. FIG. 1 shows a light transmission spectrum of an example of the sheet of the present invention.

According to the sheet of the present invention, insects can be prevented from flocking to the light source, and the sheet looks natural tones that are not colored by human eyes. In addition, since it has diffuse transparency and further shielding properties, the image of the light source is not seen through.

The sheet of the present invention has a light transmittance of 1% or less in the wavelength range (A) of 300 nm to 410 nm, and ideally substantially zero. Sheet of the present invention, since the light transmittance at such wavelength range (A) (T _A) is less than 1%, the light of wavelength insects reacts range (A) is well shielded.

In the wavelength range (B) of 450 nm to 800 nm, the light transmittance (T _B ) is 40% to 70%. When the light transmittance (T _B ) is less than 40%, for example, when the light source is covered, the visible light cannot be sufficiently transmitted, and the human eye tends to appear dark.

The sheet of the present invention has an absorption maximum peak (P), and this absorption maximum peak (P) has a maximum absorption wavelength (λ _P ) of 530 nm to 620 nm. If the maximum absorption wavelength (λ _P ) is less than 530 nm or exceeds 620 nm, it may appear colored to human eyes.

The light transmittance (T _p ) at the maximum absorption wavelength (λ _p ) of the absorption maximum peak (P) is 0.98 times or less of the maximum light transmittance (T _Bmax ) in the wavelength range (B) of 450 nm to 800 nm, preferably Is 0.86 times or less. If the light transmittance (T _P ) exceeds 0.98 times the maximum light transmittance (T _Bmax ), it tends to be colored and visible to the human eye, which is not preferable. Incidentally, the light transmittance in the wavelength range of 450nm~800nm _(B) (T B) is so in the range of 50% to 80%, the light transmittance at the maximum absorption wavelength (lambda _p) of the maximum absorption peak (P) ( T _p ) is 0.57 times or more of the maximum light transmittance (T _Bmax ).

Examples of the sheet of the present invention include a sheet made of a resin composition in which a transparent resin contains an ultraviolet absorber, a colorant, and a light diffusing agent.

An example of the transparent resin is an acrylic resin. An acrylic resin is widely used as a colorless and transparent thermoplastic resin by itself. Examples of the acrylic resin include a polymer having a methyl methacrylate unit content of 50% by mass or more, and may be a homopolymer of methyl methacrylate, or methyl methacrylate and copolymerizable therewith. A monomer copolymer may also be used.

The monomer copolymerizable with methyl methacrylate may be a monofunctional monomer having one double bond capable of radical polymerization with methyl methacrylate in the molecule, or a polyfunctional monomer having two or more. It may be a mer. Monofunctional monomers include, for example, acrylic esters such as methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and the like. Examples include methacrylic acid esters, acrylic acid, methacrylic acid, and styrene. Examples of the polyfunctional monomer include neopentyl glycol dimethacrylate, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, and trimethylolpropane trimethacrylate. These monomers are
Each can be used alone or in combination of two or more.

As the ultraviolet absorber, for example, an ultraviolet absorber having a maximum absorption wavelength (λ _UVmax ) of 350 nm to ₃₇₀ nm is used. When an ultraviolet absorber having a maximum absorption wavelength (λ _UVmax ) of less than 350 nm is used, it is necessary to contain a large amount in order to make the light transmittance (T _A ) of 410 nm or less 1% or less, which is economically disadvantageous. It is. Moreover, although the ultraviolet absorber exceeding 370 nm may be sufficient, since many of them also absorb at wavelength 450 nm or more, since the usage-amount of the coloring agent mentioned later increases and a sheet | seat looks dark, it is not preferable. .

Examples of the ultraviolet absorber having a maximum absorption wavelength (λ _UVmax ) of 350 nm to ₃₇₀ nm include 2- [5-chloro (2H) -benzotriazol-2-yl] -4-methyl-6- (te
_rt -butyl) phenol [maximum absorption wavelength λ _UVmax = 353 nm], 2,4-di-ter
and t-butyl-6- (5-chlorobenzotriazol-2-yl) phenol [maximum absorption wavelength λ _UVmax = 353 nm]. The content of the ultraviolet absorber, depending on the kind of the ultraviolet absorber, such as ² to 100 g / m ² approximately 10 g / m per unit area of the sheet.

As the colorant, a colorant having a maximum absorption wavelength (λ _VISmax ) of 530 nm to ₆₂₀ nm is used, and a dye is preferably used in terms of less scattered light. Examples of such dyes include C.I. I. Disperse Violet 26 (maximum absorption wavelength λ _UVmax = 540 nm, “Sumiplast Bordeaux HBL” (Sumitomo Chemical Co., Ltd.)) ],
C. I. Disperse Violet 28 (Maximum absorption wavelength λ
_VISmax = about 550 nm, “Sumiplast Violet RR” (Sumitomo Chemical Co., Ltd.), “
It is commercially available as “Diaresin Violet D” (Mitsubishi Chemical Corporation). ],
C. I. Pigment Violet 1 (Maximum absorption wavelength λ _UVmax
= 560 nm, “Rhodamine B” (Sun Chemical Co., Ltd.), “Final Viol
et D5480 "(BASF) and the like. ],
C. I. Solvent Violet 13 (Maximum absorption wavelength λ _VIS
max = about 580 nm, “Waxline Purple AS” (ICI), “Sum
“iplast Violet B” (Sumitomo Chemical Co., Ltd.), “Macrolex Violet B”
”(Bayer) and the like. ],
C. I. Solvent Blue 97 (Maximum absorption wavelength λ _UVmax = 58
It is commercially available as 0-610 nm, “Macrolex Blue RR” (Bayer). And the like. The content of the colorant may vary depending on the type, such as 0.001g / m ² ~0.02g / m ² approximately per unit area of the sheet.

As the light diffusing agent, inorganic fine particles such as titanium oxide, calcium carbonate, aluminum hydroxide, and talc can be used. As the light diffusing agent, organic fine particles such as crosslinked polystyrene particles and crosslinked acrylic particles can also be used. A resin that is incompatible with the transparent resin can be used after being melt-kneaded with the transparent resin, and this incompatible resin diffuses light by phase separation with the transparent resin.

The amount of the light diffusing agent used is appropriately selected so that the light transmittance (T _B ) and the haze are within the range specified in the present invention in the wavelength range (B) of 450 nm to 800 nm. when using a varies due its particle size, such as ² to 500 g / m ² about 5 g / m at a content per unit area of the sheet. If the amount of light diffusing agent used is large, the above wavelength range
The light transmittance (T _B ) in ( _B ) is low, and if it is low, the haze is low.

Such a resin composition sheet is formed, for example, by adding an ultraviolet absorber, a colorant, and a light diffusing agent to a transparent resin that is heated and in a molten state, and more specifically, an extrusion method in which the resin composition sheet is extruded and molded from a die. It can be produced by a normal molding method such as an injection molding method in which the material is injected into a mold and molded. Moreover, after pelletizing by methods, such as extrusion molding, it can also manufacture by the press molding method which heat-presses between a pair of shaping | molding die.

The resin composition sheet is also produced by a cast polymerization method in which a monomer or a partial polymer thereof is mixed with an ultraviolet absorber, a colorant, and a light diffusing agent, and the resulting mixture is polymerized in a polymerization cell. can do. As the monomer, methyl methacrylate may be used alone, or a mixture of methyl methacrylate and a monomer copolymerizable therewith may be used. The mixture is usually used by containing a polymerization initiator. In general, after polymerization, a release agent is added to facilitate release from the polymerization cell.

The resin composition sheet is obtained by mixing a UV absorber, a colorant and a light diffusing agent with the same monomer as described above, and then polymerizing by a method such as a suspension polymerization method or a bulk polymerization method to obtain a resin composition. The obtained resin composition can also be produced by a molding method such as an extrusion molding method or an injection molding method.

Such a sheet of the present invention usually has a thickness of about 0.1 mm to 30 mm.

The sheet of the present invention has fine irregularities on one side or both sides, and its ten-point average roughness (Rz) is 0.5 μm or more, preferably 1 μm or more, and usually 2 mm or less. Examples of such a sheet include a method of physically roughening the surface of the sheet by a method such as roughening with a file or sandblasting. When the sheet of the present invention is produced by an extrusion molding method, the resin particles can be provided with irregularities on the surface by dispersing insoluble resin particles in a molten transparent resin and extruding them from a die. In the case of producing by a molding method using a molding die such as an injection molding method or a press molding method, the molding die having an inner surface that is an uneven surface can be used to transfer and provide the unevenness. In the case of producing by a cast polymerization method, a polymerization cell having an irregular surface on the inner surface can be used as the polymerization cell, and the irregularity can be provided by transferring.

Since the sheet of the present invention has a light transmittance of 1% or less in the wavelength range (A) of 300 nm to 410 nm, it can be used as an illumination cover for covering a light source such as a white fluorescent lamp, so that insects gather in the light source. It can be prevented, and it looks uncolored to the human eye, and since the image of the light source cannot be seen through, it can be illuminated with illumination light of a natural color tone.

The sheet of the present invention has a light source inside, and is used as a signboard material for an internally-illuminated signboard illuminated by this internal light source, so that the color of the decoration drawn on the signboard material is not impaired. It is possible to prevent the group from being gathered, and the image of the light source cannot be seen through, so that it is preferably used.

By using the sheet of the present invention as a window material of a house, a partition plate of an entrance, etc., indoor lighting prevents insects from gathering at the windows and entrances, and sunlight is emitted in natural colors during the day. Can be taken indoors.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by this Example.

In addition, the light transmission spectrum of the sheet | seat obtained in each Example was calculated | required by measuring at 5 nm intervals in the wavelength range of 300 nm-800 nm using the spectrophotometer [Hitachi U-4000 type].
The yellow index (YI) is determined by the reflection method using a simultaneous measurement type spectroscopic colorimeter [manufactured by Nippon Denshoku Industries Co., Ltd., “SQ-2000”], by the method described in JIS Z-8722. The tristimulus values (X, Y, Z) when using the standard light are obtained, and from these tristimulus values, JI
Determined according to SZ7105.
In accordance with JIS K7136, haze is a reflection / transmittance meter [Murakami Color Research Laboratory,
HR-100 type "].
Light diffusivity is measured by measuring the intensity of transmitted light by normal incident light in increments of 0.1 degree using an automatic variable angle photometer ("GP-230" manufactured by Murakami Color Research Laboratory Co., Ltd.). The light diffusivity was evaluated by obtaining the intensity ratio (I ₅ / I ₀ ) of the transmitted light intensity (I ₅ ) at an angle of 5 degrees to the transmitted light intensity (I ₀ ) of light (0 degree). A larger intensity ratio (I ₅ / I ₀ ) indicates higher light diffusibility.
The ten-point average roughness (Rz) was obtained by scanning the surface using an ultra-deep shape measuring microscope [manufactured by Keyence Corporation, “VK-8500”].
For visual evaluation, a sheet was placed at a distance of 30 cm from the fluorescent lamp, and a case where an image of the fluorescent lamp could not be seen through this sheet was indicated as “◯”, and a visible one was indicated as “X”.

Example 1
0.002 parts by mass of 2,2′-azobisisobutyronitrile (polymerization initiator) per 100 parts by mass of methyl methacrylate was mixed and partially polymerized at 80 ° C. to obtain a partial polymerization with a polymer content of 5% by mass. I got a thing. To 98.2 parts by mass of this partially polymerized product, 0.75 part by mass of methyl methacrylate-styrene copolymer resin (MS resin) [methyl methacrylate unit 20% by mass, styrene unit 80% by mass] was added, and 2- 1.1 parts by mass of [5-chloro (2H) -benzotriazol-2-yl] -4-methyl-6-tert-butyl] phenol (ultraviolet absorber), colorant [C. I. Solvent violet 13, maximum absorption wavelength λ _VISmax = about 580 nm] 0.00016 parts by mass, titanium oxide fine powder [light diffusing agent] 0.021 parts by mass, 2,2′-azobisisobutyronitrile (polymerization initiator) 0.08 parts by mass and 0.05 parts by mass of a release agent were added, and degassed for 30 minutes under reduced pressure (87 kPa in absolute pressure). Then, it was poured into a polymerization cell composed of two glass plates (thickness 10 mm, 30 cm × 30 cm) and a vinyl chloride gasket, heated to 72 ° C. and held at that temperature for 3 hours, then heated to 120 ° C. Then, polymerization was carried out by maintaining at the same temperature for 1 hour to obtain an acrylic resin composition sheet having a thickness of 2 mm. Of the two glass plates, one used a surface having fine irregularities with a 10-point average roughness (Rz) of 25 μm on the inner surface, and one used a smooth inner surface. This acrylic resin composition sheet could not be colored visually. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. 1, and the evaluation results are shown in Table 1.

The acrylic resin composition sheet, 26.2 g / m ² and per unit area ultraviolet absorber, colorant 0.00381g / m ^2, include a light diffusing agent 18.3 g / m ^2, respectively, haze 98 .8%, YI is -2.0. The maximum value (T _Amax ) of the light transmittance in the wavelength range (A) of 300 nm to 410 nm is 0.5% (410 nm), and the minimum value of the light transmittance in the wavelength range (B) of 450 to 800 nm ( T _Bmin ) is 53.0%, and the maximum value (T _Bmax ) is 62.8%. It has a maximum absorption peak, the maximum absorption wavelength (λ _p ) is about 550 nm, and the light transmittance (T _p ) at the maximum absorption wavelength is 53.0%. The light transmittance (T _p ) at the maximum absorption wavelength is 0.84 times the maximum light transmittance (T _Bmax ).

When this sheet is used as an illumination cover for white fluorescent lamps, the light from the white fluorescent lamps is diffused and transmitted, and it looks natural milky white. There is no flock.

Example 2
An acrylic resin composition sheet is obtained by operating in the same manner as in Example 1 except that two glass plates each having an inner surface with fine irregularities having a 10-point average roughness (Rz) of 25 μm are used. It was. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. 2, and the evaluation results are shown in Table 1.

Table 1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 1 Example 2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Partially polymerized product (parts by mass) 98.2 98.2
MS resin (parts by mass) 0.75 0.75
Ultraviolet absorber (parts by mass) 1.1 1.1
(g / m ² ) 26.2 26.2
Colorant (parts by mass) 0.00016 0.00016
(g / m ² ) 0.00381 0.00381
Light diffusing agent (parts by mass) 0.021 0.021
(g / m ² ) 18.3 18.3
───────────────────────────────
T _Amax (%) 0.5 0.4
T _Bmin (%) 53.0 53.3
T _Bmax (%) 62.8 63.7
───────────────────────────────
Absorption maximum peak λ _p (nm) 550 550
T _p (%) 53.5 53.3
T _p / T _Bmax 0.84 0.84
───────────────────────────────
Haze (%) 99.8 98.6
YI -2.0 -1.8
I ₅ / I ₀ (%) 94 95
Rz (μm) 25 25
Visual evaluation ○ ○ ○
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
T _Amax : Maximum value of light transmittance in the wavelength range (A) of 300 nm to 410 nm T _Bmin : Minimum value of light transmittance in the wavelength range (B) of 450 to 700 nm T _Bmax : Wavelength range of 450 to 700 nm ( Maximum value of light transmittance in B) λ _p : Maximum absorption wavelength of maximum absorption peak T _p : Light transmittance at maximum absorption wavelength

Example 3
Example 1 except that one of the two glass plates has a fine irregularity with a 10-point average roughness (Rz) of 4 μm on the inner surface, and one has a smooth inner surface. In the same manner as in No. 1, an acrylic resin composition sheet was obtained. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. 3, and the evaluation results are shown in Table 2.

Example 4
The acrylic resin composition sheet was prepared by operating the two glass plates in the same manner as in Example 1 except that the inner surface was provided with fine irregularities having a 10-point average roughness (Rz) of 4 μm. Obtained. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. 4, and the evaluation results are shown in Table 2.

Comparative Example 1
An acrylic resin composition sheet was obtained by operating in the same manner as in Example 1 except that both glass plates had a smooth inner surface. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. 5, and the evaluation results are shown in Table 2.

Table 2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 3 Example 4 Comparative Example 1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Partial polymer (parts by mass) 98.2 98.2 98.2
MS resin (parts by mass) 0.75 0.75 0.75
Ultraviolet absorber (parts by mass) 1.1 1.1 1.1
(g / m ² ) 26.2 26.2 26.2
Colorant (parts by mass) 0.00016 0.00016 0.00016
(g / m ² ) 0.00381 0.00381 0.00381
Light diffusing agent (parts by mass) 0.021 0.021 0.021
(g / m ² ) 18.3 18.3 18.3
────────────────────────────────────────
T _Amax (%) 0.4 0.4 0.4
T _Bmin (%) 54.1 52.8 53.5
T _Bmax (%) 64.7 63.5 64.7
────────────────────────────────────────
Absorption maximum peak λ _p (nm) 550 550 550
T _p (%) 54.1 52.8 53.5
T _p / T _Bmax 0.84 0.83 0.83
────────────────────────────────────────
Haze (%) 98.0 98.8 99.0
YI -1.6 -2.4 -2.4
I ₅ / I ₀ (%) 58.6 72.6 9.9
Rz (μm) 4 4 4
Visual evaluation ○ ○ ×
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
T _Amax : Maximum value of light transmittance in the wavelength range (A) of 300 nm to 410 nm T _Bmin : Minimum value of light transmittance in the wavelength range (B) of 450 to 700 nm T _Bmax : Wavelength range of 450 to 700 nm ( Maximum value of light transmittance in B) λ _p : Maximum absorption wavelength of maximum absorption peak T _p : Light transmittance at maximum absorption wavelength

It is a light transmission spectrum of the acrylic resin composition sheet obtained in Example 1. It is a light transmission spectrum of the acrylic resin composition sheet obtained in Example 2. It is a light transmission spectrum of the acrylic resin composition sheet obtained in Example 3. It is a light transmission spectrum of the acrylic resin composition sheet obtained in Example 4. It is a light transmission spectrum of the acrylic resin composition sheet obtained in Comparative Example 1.

Explanation of symbols

A: Wavelength range from 300 nm to 410 nm B: Wavelength range from 450 nm to 700 nm P: Maximum absorption peak

Claims (3)

The haze is 95% or more, the ten-point average roughness (Rz) of at least one surface is 0.5 μm or more, and the light transmittance (T _A ) is 1% or less in the wavelength range (A) of 300 nm to 410 nm. In the wavelength range (B) from 450 nm to 800 nm, the light transmittance (T _B ) is 40% to 70%, and the maximum absorption wavelength (λ _P ) is 530 nm to 620 nm. The light transmittance (T _P ) at the maximum absorption wavelength (λ _P ) is not more than 0.98 times the maximum light transmittance (T _Bmax ) in the wavelength range (B) of 450 nm to 700 nm. Sheet to be. A transparent resin, consisting of the maximum absorption wavelength (lambda _UVmax) is an ultraviolet absorber is 350Nm～370nm, resin composition maximum absorption wavelength (λ _VISmax) was shown contain coloring and light diffusing agent is 530nm~620nm claims Item 2. The sheet according to Item 1. The sheet according to claim 2, wherein the transparent resin is an acrylic resin.

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