JP2006129712A - Lowly insect-attracting sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet capable of preventing a light source from gathering insects by covering the light source with the sheet, looking like a natural color tone without being colored by human eyes and capable of diffusing/transmitting the light from the light source. <P>SOLUTION: This sheet has ≥95% haze, ≥1% light transmittance (T<SB>A</SB>) within a 300-410 nm wave length range (A), 40-70% light transmittance (T<SB>B</SB>) within a 450-800 nm wave length range (B) and a maximum absorption peak (P) having a 530-620 nm maximum absorption wave length (λ<SB>p</SB>), and shows that the light transmittance (T<SB>p</SB>) at the maximum absorption wave length (λ<SB>p</SB>) is ≤0.86 fold of a maximum light transmittance (T<SB>Bmax</SB>) at the 450-700 nm wave length range (B). The sheet consists of a resin composition obtained by incorporating an ultraviolet light absorption agent having a 350-370 nm maximum absorption wavelength (λ<SB>UVmax</SB>) and a coloring agent having a 530-620 nm maximum absorption wave length (λ<SB>VISmax</SB>) into a transparent resin e.g. an acrylic resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a sheet, and more particularly to a sheet having a low susceptibility that can prevent insects from gathering in 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, a low-attractive sheet has been proposed that shields light of the wavelength to which insects react most sensitively and transmits most other light, for example, visible light. Yes. 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.

In addition, a sheet having low diffusion property that allows light to pass through while diffusing, such as an illumination cover that covers a light source, is also demanded as a low-attractive sheet.

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

Therefore, the present inventor can prevent insects from gathering in the light source by covering the light source, a sheet that looks natural tones that are not colored to the human eye, and can diffuse and transmit light from the light source. As a result of intensive studies to develop, the haze is 95% or more, the light absorptivity at a wavelength of 300 to 410 nm is 1% or less, and the light transmittance at a wavelength of 450 nm to 800 nm is 40% to 70%. A sheet having an absorption maximum peak with a maximum absorption wavelength of 530 to 620 nm in the range, and a light transmittance at this maximum absorption wavelength of 0.86 times or less of the maximum light transmittance at a wavelength of 450 nm to 700 nm diffuses and transmits the transmitted light. The present inventors have found that insects do not gather and appear to be hardly colored by human eyes.

That is, the present invention has a haze of 95% or more,
Light transmittance in the wavelength range 300nm~410nm _(A) (T A) is 1% or less,
In the wavelength range (B) of 450 nm to 800 nm, the light transmittance (T _B ) is 40% to 70%,
An absorption maximum peak (P) having a maximum absorption wavelength (λ _P ) of 530 nm to 620 nm;
A sheet having a light transmittance (T _P ) at the maximum absorption wavelength (λ _P ) of 0.86 times or less of a maximum light transmittance (T _Bmax ) in a wavelength range (B) of 450 nm to 700 nm. Is to provide. 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.

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 0.86 times or less of the maximum light transmittance (T _Bmax ) in the wavelength range (B) of 450 nm to 800 nm. . If the light transmittance (T _P ) exceeds 0.86 times the maximum light transmittance (T _Bmax ), it tends to be colored and seen by human eyes, which is not preferable. Incidentally, the light transmittance in the wavelength range of 450nm~800nm _(B) (T B) is so in the range of 40% to 70%, 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 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- (tert-butyl) phenol. [Maximum absorption wavelength λ _UVmax = 353 nm], 2,4-di-tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol [maximum absorption wavelength λ _UVmax = 353 nm] and the like. 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 = approximately 550 nm, “Sumiplast Violet RR” (Sumitomo Chemical Co., Ltd.), “Diaresin Violet D” (Mitsubishi Chemical Co., Ltd.)) ],
C. I. Pigment Violet 1 (maximum absorption wavelength λ _UVmax = 560 nm, “Rhodamine B” (Sun Chemical), “Final Violet D5480” (BASF), etc. ],
C. I. Solvent Violet 13 (Maximum absorption wavelength λ _VISmax = about 580 nm, “Waxoline Purple AS” (ICI), “Sumiplast Violet B” (Sumitomo Chemical), “Macrolex Violet B” (Bayer), etc. It is commercially available. ],
C. I. Solvent Blue 97 (CISolvent Blue 97) [Maximum absorption wavelength λ _UVmax = 580 to ₆₁₀ nm, “Macrolex Blue RR” (Bayer), etc.] 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. When the amount of the light diffusing agent used is large, the light transmittance (T _B ) in the wavelength range ( _B ) is low, and when it is small, the haze is low.

Such a resin composition sheet is formed by adding a UV absorber, a colorant and a light diffusing agent to a transparent resin which is heated and in a molten state, for example, an ordinary method such as extrusion molding or injection molding. It can be manufactured by a molding method. Alternatively, the pellets may be pelletized by a method such as extrusion and then hot pressed by a press molding method.

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 sheet is obtained by mixing a monomer similar to the above with an ultraviolet absorber, a colorant and a light diffusing agent, 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.

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 since it does not appear to be colored to human eyes, 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 class from flocking.

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 were obtained, and the tristimulus values were obtained according to JIS Z7105.
The haze was measured according to JIS K7136 using a reflection / transmittance meter [manufactured by Murakami Color Research Laboratory, "HR-100 type"].

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 98.5 parts by mass of this partially polymerized product, 1.49 parts 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- 1.5 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, “Waxolin Purple AS”] 0.0002 parts by mass, titanium oxide fine powder [light diffusing agent] 0.042 parts by mass, 2,2′-azobisisobutyro 0.08 parts by mass of nitrile (polymerization initiator) and 0.05 parts by mass of a release agent were added and deaerated for 30 minutes under reduced pressure (87 kPa at absolute pressure). After that, 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 the same temperature for 3 hours, then to 120 ° C. The mixture was heated and held at the same temperature for 1 hour for polymerization to obtain an acrylic resin composition sheet having a thickness of 2 mm. 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, 35.7 g / m ² and per unit area ultraviolet absorber, colorant 0.00476g / m ^2, include a light diffusing agent 36.5 g / m ^2, respectively, haze 99 .4% and YI is -3.1. The maximum value (T _Amax ) of the light transmittance in the wavelength range (A) of 300 nm to 410 nm is 0.1% (410 nm), and the minimum value of the light transmittance in the wavelength range (B) of 450 to 800 nm ( T _Bmin ) is 42.2%, and the maximum value (T _Bmax ) is 53.1%. It has a maximum absorption peak, the maximum absorption wavelength (λ _p ) is about 560 nm, and the light transmittance (T _p ) at the maximum absorption wavelength is 42.2%. The light transmittance (T _p ) at the maximum absorption wavelength is 0.79 times the maximum light transmittance (T _Bmax ).

When this sheet is used as an illumination cover for a white fluorescent lamp, the light from the white fluorescent lamp is diffused and transmitted to look natural milky white, and insects do not gather even when used outdoors.

Example 2
An acrylic resin composition sheet was obtained in the same manner as in Example 1 except that the use amount of the partial polymer was 97.5 parts by mass and the use amount of the ultraviolet absorber was 1.0 part by mass. This acrylic resin composition sheet could not be colored visually. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. The evaluation results are shown in Table 1.

The acrylic resin composition sheet, 23.8 g / m ² and per unit area ultraviolet absorber, colorant 0.00476g / m ^2, include a light diffusing agent 36.5 g / m ^2, respectively, haze 99 .4%, YI is -6.3. The maximum value (T _Amax ) of light transmittance in the wavelength range (A) of 300 nm to 410 nm is 0.3% (410 nm), and the minimum value of light transmittance (T _{Bmin in} the wavelength range (B) of 450 to 800 nm. ) Is 42.2%, and the maximum value (T _Bmax ) is 53.1%. It has a maximum absorption peak (P), its maximum absorption wavelength (λ _p ) is about 560 nm, and its light transmittance (T _p ) at the maximum absorption wavelength is 42.2%. The light transmittance (T _p ) at the maximum absorption wavelength is 0.80 times the maximum light transmittance (T _Bmax ).

When this sheet is used as an illumination cover for a white fluorescent lamp, the light from the white fluorescent lamp is diffused and transmitted to look natural milky white, and insects do not gather even when used outdoors.

Example 3
An acrylic resin composition sheet was obtained in the same manner as in Example 1 except that the amount of the partially polymerized product was 97.8 parts by mass and the amount of the ultraviolet absorber was 0.75 parts by mass. This acrylic resin composition sheet could not be colored visually. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. The evaluation results are shown in Table 1.

The acrylic resin composition sheet, 17.9 g / m ² and per unit area ultraviolet absorber, colorant 0.00476g / m ^2, include a light diffusing agent 36.5 g / m ^2, respectively, haze 99 .4% and YI is -7.4. The maximum value (T _Amax ) of light transmittance in the wavelength range (A) of 300 nm to 410 nm is 0.8% (410 nm), and the minimum value of light transmittance (T _{Bmin in} the wavelength range (B) of 450 to 800 nm. ) Is 43.4%, and the maximum value (T _Bmax ) is 54.1%. It has a maximum absorption peak (P), its maximum absorption wavelength (λ _p ) is about 560 nm, and its light transmittance (T _p ) at the maximum absorption wavelength is 43.4%. The light transmittance (T _p ) at the maximum absorption wavelength is 0.80 times the maximum light transmittance (T _Bmax ).

When this sheet is used as an illumination cover for a white fluorescent lamp, the light from the white fluorescent lamp is diffused and transmitted to look natural milky white, and insects do not gather even when used outdoors.

Example 4
The same operation as in Example 1 was conducted except that the amount of the partially polymerized product was 97.5 parts by mass, the amount of the ultraviolet absorber used was 1.0 part by mass, and the amount of the colorant used was 0.00015 parts by mass. Thus, an acrylic resin composition sheet was obtained. This acrylic resin composition sheet could not be colored visually. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. The evaluation results are shown in Table 2.

The acrylic resin composition sheet, 23.8 g / m ² and per unit area ultraviolet absorber, colorant 0.0036 g / m ^2, include a light diffusing agent 36.5 g / m ^2, respectively, haze 99 .2% YI is -2.2. The maximum value (T _Amax ) of light transmittance in the wavelength range (A) of 300 nm to 410 nm is 0.3% (410 nm), and the minimum value of light transmittance (T _{Bmin in} the wavelength range (B) of 450 to 800 nm. ) Is 44.5%, and the maximum value (T _Bmax ) is 54.2%. It has a maximum absorption peak (P), its maximum absorption wavelength (λ _p ) is about 560 nm, and its light transmittance (T _p ) at the maximum absorption wavelength is 44.5%. The light transmittance (T _p ) at the maximum absorption wavelength is 0.82 times the maximum light transmittance (T _Bmax ).

When this sheet is used as an illumination cover for a white fluorescent lamp, the light from the white fluorescent lamp is diffused and transmitted to look natural milky white, and insects do not gather even when used outdoors.

Example 5
The amount of partial polymer used is 98.2 parts by mass, the amount of MS resin used is 0.75 parts by mass, the amount of UV absorber used is 1.1 parts by mass, and the amount of colorant used is 0.00016. An acrylic resin composition sheet was obtained in the same manner as in Example 1 except that the amount of the light diffusing agent was 0.021 parts by mass. This acrylic resin composition sheet could not be colored visually. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. The evaluation results are shown in Table 2.

The acrylic resin composition sheet, 26.2 g / m ² and per unit area ultraviolet absorber, colorant 0.0036 g / m ^2, include a light diffusing agent 18.4 g / m ^2, respectively, haze 99 .3%, YI is -1.7. The maximum value (T _Amax ) of light transmittance in the wavelength range (A) of 300 nm to 410 nm is 0.6% (410 nm), and the minimum value of light transmittance (T _{Bmin in} the wavelength range (B) of 450 to 800 nm. ) Is 55.9%, and the maximum value (T _Bmax ) is 65.9%. It has a maximum absorption peak (P), its maximum absorption wavelength (λ _p ) is about 550 nm, and its light transmittance (T _p ) at the maximum absorption wavelength is 55.9%. The light transmittance (T _p ) at the maximum absorption wavelength is 0.85 times the maximum light transmittance (T _Bmax ).

When this sheet is used as a lighting cover for a white fluorescent lamp, the light from the white fluorescent lamp is diffused and transmitted to look natural milky white, and insects do not gather even when used outdoors.

Comparative Example 1
The same operation as in Example 1 was performed except that the amount of the partially polymerized product was 97.5 parts by mass, the amount of the ultraviolet absorber used was 1.0 part by mass, and the amount of the colorant used was 0.00005 parts by mass. Thus, an acrylic resin composition sheet was obtained. This acrylic resin composition sheet was slightly colored yellow visually. The light transmission spectrum of this acrylic resin composition sheet is shown in FIG. The evaluation results are shown in Table 2.

The acrylic resin composition sheet is, 23.8 g / m ² and per unit area ultraviolet absorber, colorant 0.0012 g / m ^2, include a light diffusing agent 36.5 g / m ^2, respectively, haze 99 .4%, YI is 6.8. The maximum value (T _Amax ) of light transmittance in the wavelength range (A) of 300 nm to 410 nm is 0.3% (410 nm), and the minimum value of light transmittance (T _{Bmin in} the wavelength range (B) of 450 to 800 nm. ) Is 46.5%, and the maximum value (T _Bmax ) is 53.2%. It has a maximum absorption peak (P), its maximum absorption wavelength (λ _p ) is about 540 nm, and its light transmittance (T _p ) at the maximum absorption wavelength is 46.9%. The light transmittance (T _p ) at the maximum absorption wavelength is 0.88 times the maximum light transmittance (T _Bmax ).

When this sheet is used as an illumination cover for a white fluorescent lamp, the insects do not collect and the light from the white fluorescent lamp diffuses and is transmitted, but the light from the white fluorescent lamp appears slightly yellow.

Table 1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 1 Example 2 Example 3
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Partial polymer (parts by mass) 98.5 97.5 97.8
MS resin (parts by weight) 1.49 1.49 1.49
UV absorber (parts by mass) 1.5 1.0 0.75
(g / m ² ) 35.7 23.8 17.9
Colorant (parts by mass) 0.0002 0.0002 0.0002
(g / m ² ) 0.00476 0.00476 0.00476
Light diffusing agent (parts by mass) 0.042 0.042 0.042
(g / m ² ) 36.5 36.5 36.5
────────────────────────────────────────
T _Amax (%) 0.1 0.3 0.8
T _Bmin (%) 42.2 42.2 43.4
T _Bmax (%) 53.1 53.1 53.1
────────────────────────────────────────
Absorption maximum peak λ _p (nm) 560 560 560
T _p (%) 42.2 42.2 43.4
T _p / T _Bmax 0.79 0.79 0.80
────────────────────────────────────────
Haze (%) 99.4 99.4 99.4
YI-3.1-6.3-7.4
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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

Table 2
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 4 Example 5 Comparative Example 1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Partial polymer (parts by mass) 97.5 98.2 97.5
MS resin (parts by weight) 1.49 0.75 1.49
Ultraviolet absorber (parts by mass) 1.0 1.1 1.0
(g / m ² ) 23.8 26.2 23.8
Colorant (parts by mass) 0.00015 0.00016 0.00005
(g / m ² ) 0.00357 0.00390 0.00119
Light diffusing agent (parts by mass) 0.042 0.042 0.042
(g / m ² ) 36.5 36.5 36.5
────────────────────────────────────────
T _Amax (%) 0.3 0.6 0.3
T _Bmin (%) 44.5 55.9 46.5
T _Bmax (%) 54.2 65.9 53.2
────────────────────────────────────────
Absorption maximum peak λ _p (nm) 560 550 540
T _p (%) 42.5 55.9 46.9
T _p / T _Bmax 0.82 0.85 0.88
────────────────────────────────────────
Haze (%) 99.2 99.3 99.4
YI -2.2 -1.7 6.8
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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 Example 5. 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 light transmittance (T _A ) is 1% or less in the wavelength range (A) of 300 nm to 410 nm, and the light transmittance (T _B ) is in the wavelength range (B) of 450 nm to 800 nm. from 40% to 70%, it has an absorption maximum peak wavelength of maximum absorption (lambda _P) is 530nm~620nm (P), light transmittance at the maximum absorption wavelength (λ _P) (T _P) is, 450 nm A sheet having a maximum light transmittance (T _Bmax ) of 0.86 times or less in a wavelength range (B) of ˜700 nm. 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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