JP2010170866A - Resin composition for led illumination cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition for an illumination cover, which can develop sufficient brightness as illumination while sufficiently shielding light of wavelength in ultraviolet ray region even when an LED is used as a light source. <P>SOLUTION: The resin composition for LED illumination cover has an absorption threshold wavelength of 470-530 nm when it is made a plate shape of thickness 2 mm, and has a transmissivity of light in wavelength 555-800 nm of 80% or more when it is made the plate shape of thickness 2 mm. The resin composition can be suitably used, in particular, in a semiconductor element manufacturing plant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resin composition for an LED lighting cover.

  In general, in a clean room of a semiconductor factory, a photosensitive agent that reacts with ultraviolet rays is used. Therefore, lighting installed in the semiconductor factory is required to have light with a wavelength in the ultraviolet region blocked. For such illumination, a fluorescent lamp as a light source is widely used. However, the fluorescent lamp has an emission spectrum having a strong peak at 436 nm, that is, an emission line of mercury due to discharge. It is common to have a lighting cover to block mercury emission lines. As this illumination cover, an illumination cover made of a resin composition that cuts light having a wavelength of 440 nm or less is known (for example, see Patent Documents 1 to 3).

JP 61-250959 A JP-A-11-273625 JP 2001-243915 A

  However, when an LED (white) is used as a light source, the LED has an emission spectrum having a strong and relatively broad peak with the peak at about 470 nm. It was not always possible to block it sufficiently. Thus, there has been a demand for a resin composition for a lighting cover that can sufficiently block light having a wavelength in the ultraviolet region even when an LED is used as a light source. On the other hand, in illumination using an LED light source, as in the case of a fluorescent lamp, sufficient brightness is required, and a resin composition for an illumination cover that can express sufficient brightness as illumination has been desired. . Accordingly, an object of the present invention is to provide a resin composition for a lighting cover that can sufficiently exhibit light as illumination while sufficiently blocking light having a wavelength in the ultraviolet region even when an LED is used as a light source. There is.

  As a result of intensive studies, the present inventors have found a resin composition that can achieve the above object, and have completed the present invention. That is, the present invention has an absorption limit wavelength of 470 to 530 nm when a plate having a thickness of 2 mm is used, and a transmittance of light having a wavelength of 555 to 800 nm when a plate having a thickness of 2 mm is 80% or more. It is providing the resin composition for a certain LED lighting cover.

  According to the present invention, even when an LED is used as a light source, it is possible to provide a resin composition for a lighting cover capable of expressing sufficient brightness as illumination while sufficiently blocking light having a wavelength in the ultraviolet region. it can. Especially the resin composition of this invention is used suitably as a cover of LED lighting used for the clean room etc. in a semiconductor element manufacturing factory.

It is the graph of the transmittance | permeability of the light with respect to each wavelength measured with the "self-recording spectrophotometer U-4000" in the methacrylic resin board of Example 1 [vertical axis; transmittance (%), horizontal axis; wavelength (nm)]. Graph of relative light emission intensity (dashed line) and relative transmitted light intensity (solid line) of the LED light source with respect to each wavelength measured by the “instant multi-photometry system MCPD3000” on the methacrylic resin plate of Example 1 (vertical axis; relative light emission intensity or relative transmission) Light intensity, horizontal axis; wavelength (nm)]. It is the graph of the transmittance | permeability of the light with respect to each wavelength measured with the "self-recording spectrophotometer U-4000" in the methacrylic resin board of Example 2 [vertical axis; transmittance (%), horizontal axis; wavelength (nm)]. Graph of relative light emission intensity (dashed line) and relative transmitted light intensity (solid line) of the LED light source with respect to each wavelength measured by the “instant multi-photometry system MCPD3000” in the methacrylic resin plate of Example 2 [vertical axis; relative light emission intensity or relative transmission Light intensity, horizontal axis; wavelength (nm)]. It is a graph of the light transmittance with respect to each wavelength measured by the “self-recording spectrophotometer U-4000” in the methacrylic resin plate of Comparative Example 1 (vertical axis: transmittance (%), horizontal axis: wavelength (nm)). Graph of relative light emission intensity (dashed line) and relative transmitted light intensity (solid line) of LED light source with respect to each wavelength measured by “instant multi-photometry system MCPD3000” on the methacrylic resin plate of Comparative Example 1 [vertical axis; relative light emission intensity or relative transmission Light intensity, horizontal axis; wavelength (nm)]. It is a graph of the light transmittance with respect to each wavelength measured with the “self-recording spectrophotometer U-4000” in the methacrylic resin plate of Comparative Example 2 (vertical axis: transmittance (%), horizontal axis: wavelength (nm)). Graph of relative light emission intensity (dashed line) and relative transmitted light intensity (solid line) of LED light source with respect to each wavelength measured by “instant multi-photometry system MCPD3000” on the methacrylic resin plate of Comparative Example 2 (vertical axis; relative light emission intensity or relative transmission) Light intensity, horizontal axis; wavelength (nm)]. 4 is a graph of light transmittance with respect to each wavelength measured by a “self-recording spectrophotometer U-4000” in the methacrylic resin plate of Example 3 (vertical axis: transmittance (%), horizontal axis: wavelength (nm)). Graph of relative light emission intensity (dashed line) and relative transmitted light intensity (solid line) of LED light source for each wavelength measured by “instant multi-photometry system MCPD3000” in the methacrylic resin plate of Example 3 [vertical axis; relative light emission intensity or relative transmission Light intensity, horizontal axis; wavelength (nm)]. It is the graph of the transmittance | permeability of the light with respect to each wavelength measured with the "self-recording spectrophotometer U-4000" in the methacrylic resin board of the comparative example 3 [vertical axis; transmittance | permeability (%), horizontal axis; wavelength (nm)]. Graph of relative light emission intensity (dashed line) and relative transmitted light intensity (solid line) of LED light source for each wavelength measured by “instant multi-photometry system MCPD3000” on the methacrylic resin plate of Comparative Example 3 [vertical axis; relative light emission intensity or relative transmission Light intensity, horizontal axis; wavelength (nm)].

  The resin composition of the present invention has (1) an absorption limit wavelength of 470 to 530 nm when formed into a plate having a thickness of 2 mm, and (2) transmission of light having a wavelength of 555 to 800 nm when formed into a plate having a thickness of 2 mm. The rate is 80% or more. By satisfying such physical properties, the resin composition of the present invention can express sufficient brightness as illumination while sufficiently blocking light in the wavelength region of the ultraviolet region even when an LED is used as a light source. It is suitable as a cover for LED lighting.

  The absorption limit wavelength in the above (1) means a term defined in JIS B7113. Specifically, in a resin composition molded into a 2 mm thick plate, the light transmittance is It means a limit wavelength of 5% or less. The measurement of the absorption limit wavelength is also performed based on JIS B7113.

The transmittance of light having a wavelength of 555 to 800 nm in the above (2) is obtained by irradiating a resin composition molded into a plate shape having a thickness of 2 mm with light having a wavelength of 555 to 800 nm and measuring the transmittance with respect to each wavelength. It is done. Transmittance, the intensity of the incident light is _{I 0,} the intensity of the transmitted light when the _{I t,} is calculated in accordance with equation _{I t / I 0 × 100 (} %). In this invention, the transmittance | permeability of the light of wavelength 555-800 nm in said (2) is 80% or more. By satisfying such characteristics, specifically, it is possible to transmit light having a wavelength longer than that including the wavelength of 555 nm which is most bright to the human eye. It can be secured. Further, in terms of the brightness of the illumination, the transmittance is preferably 85% or more. The transmittance can be measured by a conventionally known method such as using a spectrophotometer.

  The resin composition of the present invention is suitable as a cover for illumination using LED (white) as a light source. The LED light source here has a light emission spectrum having a strong and relatively wide peak with the peak at about 470 nm, unlike a fluorescent lamp widely used as conventional illumination. Therefore, as an illumination cover for an LED light source, it is not always sufficient to simply block the mercury emission line (436 nm) of a fluorescent lamp as in a conventional illumination cover. The resin composition of the present invention can sufficiently block light having a wavelength in the ultraviolet region (about 430 to about 470 nm) by satisfying the above property (1). As the LED light source, any white light source used for illumination can be selected as appropriate.

  The resin composition of the present invention usually contains a predetermined resin (A), a predetermined dye (B), and a predetermined ultraviolet absorber (C) so as to satisfy the characteristics (1) and (2). It has been made. Examples of the resin (A) include methacrylic resin, polystyrene resin, polyvinyl chloride resin, acrylonitrile-styrene copolymer resin, methyl methacrylate-styrene copolymer resin, acrylonitrile-butadiene-styrene copolymer resin, and the like. Two or more of these may be used as necessary. Among these, a methacrylic resin is preferable from the viewpoint of transparency and weather resistance.

  The methacrylic resin is obtained by polymerizing a monomer mainly composed of methyl methacrylate, and the monomer may be composed only of methyl methacrylate, or methyl methacrylate and methyl methacrylate. However, when other monomers other than methyl methacrylate are also included, the content of methyl methacrylate is 50% by mass or more, preferably 70%. It is at least 90% by mass, more preferably at least 90% by mass. When other monomers other than methyl methacrylate are also included, they may be only one type or two or more types.

  The monomer other than methyl methacrylate is not particularly limited as long as it is a monomer copolymerizable with methyl methacrylate, and is a monofunctional monomer having one double bond capable of radical polymerization in one molecule. The monomer may be a polyfunctional monomer having two or more double bonds capable of radical polymerization in one molecule.

  Monofunctional monomers that can be used as other monomers other than methyl methacrylate include, for example, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, tetrahydrofurfuryl acrylate, Esters of acrylic acid with aliphatic alcohols, aromatic alcohols or alicyclic alcohols such as isobornyl acrylate, benzyl acrylate, cyclohexyl acrylate; propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, tetrahydrofurfuryl Methacrylic, such as methacrylate, isobornyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate And esters of aliphatic alcohols, aromatic alcohols or alicyclic alcohols; esters of acrylic acid and hydroxy alcohols such as hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate; hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxy Esters of methacrylic acid and hydroxyalcohol such as butyl methacrylate; Unsaturated acids such as acrylic acid and methacrylic acid; Styrene monomers such as styrene and α-methylstyrene; Acrylonitrile and methacrylonitrile Unsaturated nitriles; maleic acid derivatives such as maleic anhydride, phenylmaleimide and cyclohexylmaleimide; vinyl carboxylates such as vinyl acetate; and the like.

  Examples of the polyfunctional monomer include monoethylene glycol diacrylate, monoethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol diacrylate, and tetraethylene. Glycol dimethacrylate, neopentyl glycol diacrylate, neopentyl glycol dimethacrylate, hexanediol diacrylate, hexanediol dimethacrylate, nonanediol diacrylate, nonanediol dimethacrylate, trimethylolpropane diacrylate, trimethylolpropane dimethacrylate, trimethylol Propane triacrylate, Trimethylolpropane trimethacrylate, Bis (2-methacryloyloxyethyl) ester, allyl methacrylate, and the like.

  Preferred examples of the dye (B) include orange dyes having a maximum absorption wavelength of 500 nm or less, and yellow dyes having a maximum absorption wavelength of 500 nm or less. Moreover, you may use these 2 types together as needed. A conventionally well-known thing can be employ | adopted as said orange type dye, Preferably Solvent Orange 86 ("Solvent Orange 86"), Solvent Orange 60 ("Solvent Orange 60"), etc. are mentioned. Solvent Orange 86 is commercially available, for example, as “Diaresin Orange G” (manufactured by Mitsubishi Chemical Corporation), and Solvent Orange 60 is, for example, “Sumiplast Orange HRP” (maximum absorption wavelength of about 450 nm; Sumika Chemtex). Is commercially available.

  As the yellow dye, conventionally known dyes can be used, and preferably Disperse Yellow 54 (“Disperse Yellow 54”), Solvent Green 5 (“Solvent Green 5”), Solvent Yellow 16 ( "Solvent Yellow 16"), Solvent Yellow 157 ("Solvent Yellow 157"), Disperse Yellow 160 (Disperse Yellow 160)), Solvent Yellow 112 ("Solvent Yellow 112"), Solvent Yellow 104 ("Solvent Yellow 104 "), Solvent Yellow 114 (" Solvent Yellow 114 "), Solvent Yellow 93 (" Solvent Yellow 93 "), Solvent 160: 1 (" Solvent 160: 1 "), Disperse Yellow 201 (" Disperse Yellow 201 "), and the like. Moreover, you may use 2 or more types of these as needed. Of these, Solvent Yellow 93 and Disperse Yellow 201 are preferable.

In addition, these yellow dyes are marketed with the following names, for example.
Disperse Yellow 54; “Sumiplast Yellow HLR” manufactured by Sumika Chemtex Co., Ltd. (maximum absorption wavelength: about 440 nm),
Solvent Green 5: “Sumiplast Yellow FL-7G” (maximum absorption wavelength: about 470 nm) manufactured by Sumika Chemtex Co., Ltd.
Solvent Yellow 16; “Sumiplast Yellow GC” manufactured by Sumika Chemtex,
Solvent Yellow 157; “Sumiplast Lemon Yellow HGN” manufactured by Sumika Chemtex Co., Ltd. (maximum absorption wavelength: about 440 nm),
Disperse Yellow 160; “Diaresin Yellow H2G” manufactured by Mitsubishi Chemical Corporation,
Solvent Yellow 112; “Diaresin Yellow HC” manufactured by Mitsubishi Chemical Corporation,
Solvent Yellow 104; “Diaresin Yellow F” manufactured by Mitsubishi Chemical Corporation,
Solvent Yellow 114; “Diaresin Yellow HG” manufactured by Mitsubishi Chemical Corporation,
Solvent Yellow 93; “Macrolex Yellow 3G” manufactured by LANXESS
Solvent 160: 1; “Macrolex Fluorescence Yellow 10GN” manufactured by LANXESS,
Disperse Yellow 201; “Macrolex Yellow 6G” manufactured by LANXESS

  The ultraviolet absorber (C) preferably has a maximum absorption wavelength of 400 nm or less, and examples thereof include benzotriazole compounds, benzophenone compounds, benzoate compounds, hindered amine compounds, and malonate compounds. Moreover, these 2 or more types can also be used as needed. Of these, benzotriazole compounds and hindered amine compounds are preferable from the viewpoint of ultraviolet absorption ability and cost.

  Examples of the benzotriazole-based compound include “Sumisorb 200”, “Sumisorb 250”, “Sumisorb 300”, “Sumisorb 340”, and “Sumisorb 350” manufactured by Sumitomo Chemical Co., Ltd. Examples of the benzophenone-based compound include “Sumisorb 130” manufactured by Sumitomo Chemical Co., “Tinubin P” manufactured by Ciba Specialty Chemicals, “Seasorb 110” manufactured by Sipro Kasei Co., Ltd., and the like. Examples of the benzoate-based compound include “Sumisorb 400” manufactured by Sumitomo Chemical Co., Ltd. Examples of the hindered amine compound include “Tinuvin 770” manufactured by Ciba Specialty Chemicals. Examples of malonate compounds include “Hostabin PR-25” manufactured by Clariant Japan.

  The contents of the resin (A), the dye (B), and the ultraviolet absorber (C) with respect to the resin composition of the present invention are appropriately selected so that the resin composition of the present invention satisfies the above-described physical properties. Preferably, the resin (A) is 98 to 99.989 parts by weight, the dye (B) is 0.01 to 1 part by weight, and the ultraviolet absorber (C) is 0.001 to 1 part by weight.

  Furthermore, when using the said orange dye as said dye (B), the content is 0.02 with respect to a total of 100 weight part of said resin (A), said dye (B), and said ultraviolet absorber. -0.1 weight part is preferable and 0.04-0.08 weight part is more preferable. Moreover, when using the said yellow dye as said dye (B), the content is 0.07 with respect to a total of 100 weight part of the said resin (A), the said dye (B), and the said ultraviolet absorber. -0.5 weight part is preferable and 0.1-0.3 weight part is more preferable. If the content of the dye (B) is too small, the absorption limit wavelength of the resulting resin composition may be less than 470 nm, which is not preferable. If the content of the dye (B) is too large, the resulting resin composition is obtained. This is not preferable because the absorption limit wavelength of an object exceeds 530 nm and the transmittance of light having a wavelength of 555 to 800 nm may be less than 80%.

  Furthermore, the content of the ultraviolet absorber (C) is 0.05 to 0.5% by weight with respect to a total of 100 parts by weight of the resin (A), the dye (B) and the ultraviolet absorber. Is preferable, and it is more preferable that it is 0.1 to 0.3 weight%.

  The resin composition of the present invention contains a stabilizer, an antioxidant, a flame retardant, an antistatic agent, a release agent, a light diffusing agent, etc., as necessary within the scope of the effects of the present invention. It may be added.

  As a method for producing the resin composition of the present invention, a conventionally known method can be employed. For example, the resin (A), the dye (B), and the ultraviolet absorber (C) are mixed with a Henschel mixer or a tumbler. Then, after mixing the dye (B) and the ultraviolet absorber (C) with a raw material monomer for obtaining the resin (A) by melt-kneading with a uniaxial or biaxial extruder, etc. Examples include a polymerization method. Especially, when using a methacryl resin as said resin (A), the latter method is preferable.

  The resin composition of the present invention can be further formed into a flat plate or the like by a conventionally known method such as extrusion molding, injection molding, cast polymerization (cast molding). When the resin composition is molded into a flat plate shape, the resin composition can be further formed into a desired shape by a thermoforming method, or biaxially stretched to improve its strength. In addition, the flat resin composition is coated with a crosslinked resin to improve the surface hardness and solvent resistance, or is coated with a fluorine resin or a silicone resin to prevent the surface from being stained. be able to. Further, within the range of the effects of the present invention, cast polymerization using a mold provided with a mat shape, transfer using a roll provided with a mat shape, or by sandblasting, Fine irregularities can be imparted to the surface of the flat resin composition.

  In this invention, it is preferable to shape | mold into the flat form of thickness about 0.5-20 mm from the point of the use of an LED lighting cover. Further, when a methacrylic resin is used as the resin (A), it is preferably molded by cast polymerization.

  Next, a method for forming a flat plate by cast polymerization exemplified as a preferred method will be described. Cast polymerization is carried out by adding a predetermined amount of the dye (B) and the ultraviolet absorber (C) to a monomer mainly composed of methyl methacrylate or a partial polymer (syrup) obtained by partially polymerizing the monomer. After mixing, the mixture is poured into a mold and then polymerized in the mold. Specifically, the polymerization can be carried out in a mold comprising a gasket and two flat plates opposed via the gasket. As the gasket, a material such as a soft vinyl chloride resin, a silicone resin, a chloroprene resin, a neoprene resin, a nitrile resin, or a fluororesin can be used. Moreover, as a flat plate, the thing made from SUS and the thing made from glass can be used.

  Cast polymerization can be performed by adding a radical initiator to the mixture, pouring it into the mold, and then heating the mold. Examples of the radical initiator include 1,1′-azobis (cyclohexane-1-carbonitrile), 2,2′-azobis (2,4,4-trimethylpentene), 2,2′-azobis (2-methyl). Propane), 2-cyano-2-propyrazoformamide, 2,2'-azobis (2-hydroxy-methylpropionate), 2,2'-azobis (2-methyl-butyronitrile), 2,2'-azo Bisisobutyronitrile, 2,2'-azobis (2,4-dimethyl-valeronitrile), 2,2'-azobis (2,4-dimethyl-4methoxyvaleronitrile), 2,2'-azobis [2 -(2-imidazolin-2-yl) propane], azo compounds such as dimethyl 2,2′-azobis (2-methylpropionate); dicumyl peroxide, t-butyl Diacyl peroxide or dialkyl peroxide initiators such as rucumyl peroxide, di-t-butyl peroxide, benzoyl peroxide, lauroyl peroxide; t-butylperoxy-3,3,5-trimethylhexano Ate, t-butyl peroxylaurate, t-butyl peroxyisobutyrate, t-butyl peroxyacetate, di-t-butylperoxyhexahydroterephthalate, di-t-butylperoxyazelate, t-butyl Peroxy-2-ethylhexanoate, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, t-amylperoxy-2-ethylhexanoate, t-butylperoxypivalate Peroxyester initiators such as Parkinate initiators such as ruperoxyallyl carbonate, t-butylperoxyisopropyl carbonate, bis (4-t-butylcyclohexyl) peroxydicarbonate; 1,1-di-t-butylperoxycyclohexane, 1, Peroxyketal initiators such as 1-di-t-butylperoxy-3,3,5-trimethylcyclohexane, 1,1-di-t-hexylperoxy-3,3,5-trimethylcyclohexane; etc. Is mentioned. Only one polymerization initiator may be used, or two or more polymerization initiators may be used.

  The usage-amount of a radical initiator is about 0.01-5 weight part normally with respect to 100 weight part of said monomers or partial polymers total amount. The polymerization temperature is usually 50 ° C. to 90 ° C., and the time required for the polymerization is usually 1 to 10 hours. Furthermore, after the polymerization, the temperature may be raised to about 90 ° C. to 120 ° C. as necessary for the purpose of completing the polymerization.

  Thus, the resin composition of the present invention can be obtained. Although this resin composition is useful as an LED lighting cover, it is particularly suitable as an LED lighting cover used in a clean room in a semiconductor element manufacturing factory.

  Examples of the present invention will be described below, but the present invention is not limited by these examples. Various measurements in the examples were performed as follows.

(1) Absorption limit wavelength Based on JIS B7113, the absorption limit wavelength in a 2 mm-thick methacrylic resin plate obtained in the following examples was measured using a “self-recording spectrophotometer U-4000” manufactured by Hitachi, Ltd. did.

(2) Transmittance of light having a wavelength of 555 nm Transmission of light having a wavelength of 555 nm in a methacrylic resin plate having a thickness of 2 mm obtained in the following example using a “self-recording spectrophotometer U-4000” manufactured by Hitachi, Ltd. The rate was measured.

(3) Light transmittance when using an LED light source With respect to a methacrylic resin plate having a thickness of 2 mm obtained in the following examples, an LED light source [CREE Inc. "IWS-351-UW-C3"] made by the manufacturer. Next, an “instant multi-photometry system MCPD3000” manufactured by Otsuka Electronics Co., Ltd. was disposed at a position of about 30 mm in the normal direction (directly above) on the opposite surface of the methacrylic resin plate to the LED light source. Then, the transmittance | permeability of light was measured for every wavelength with respect to the light emitted from the LED light source. Here, the transmittance T (%) is obtained by the following equation.

Formula; T (%) = I _t / I _L × 100
(I _t refers to the relative intensity of transmitted light of each wavelength when formed into a 1 the sensitivity of the light receiving elements, I _L meaning the relative emission intensity of the LED light source of each wavelength when formed into a 1 the sensitivity of the light receiving element To do.)

(4) Sensory evaluation of brightness when using an LED light source Similar to (3) above, the surface normal direction (directly above) of about 20 mm with respect to the 2 mm-thick methacrylic resin plate obtained in the following example. The LED light source [“IWS-351-UW-C3” manufactured by CREE Co., Ltd.] was disposed at the position. Next, the methacrylic resin plate was visually observed from the opposite side to the LED light source, and the brightness was evaluated. The symbol “◯” indicates that the brightness is good, and the symbol “x” indicates that the color of the dye is dark and the brightness is not satisfactory.

Example 1
99.75 parts by weight of methyl methacrylate partial polymer syrup containing 5% by weight of polymethyl methacrylate, 86 parts of Solvent Orange 86 (“Diaresin Orange G” manufactured by Mitsubishi Chemical Corporation), UV absorber [Sumitomo "Sumisorb 300" manufactured by Chemical Co., Ltd.] 0.20 parts by weight, 0.02 part by weight of UV absorber [Sumisorb 200 "manufactured by Sumitomo Chemical Co., Ltd., 2,2'-azobis (isobutyro) as a radical initiator Nitrile) 0.08 part by weight was mixed. This mixture was poured into a cell having a gap of 2 mm composed of two glass plates and a vinyl chloride gasket, and the polymerization reaction was carried out by heating at 70 ° C. for 3 hours and then at 120 ° C. for 1 hour. A methacrylic resin plate having a thickness of 2 mm was obtained. Table 1 shows the absorption limit wavelength, the transmittance of light having a wavelength of 555 nm, the transmittance when an LED light source is used, and the brightness when an LED light source is used in the obtained methacrylic resin plate. FIG. 1 shows a graph of light transmittance (vertical axis: transmittance (%), horizontal axis: wavelength (nm)) with respect to each wavelength measured by the “self-recording spectrophotometer U-4000”. 2 is a graph of the relative light emission intensity (broken line) and the relative transmitted light intensity (solid line) of the LED light source with respect to each wavelength measured by the “instant multi-photometry system MCPD3000” [vertical axis: relative light emission intensity or relative transmitted light intensity, horizontal Axis; wavelength (nm)].

Example 2
A methacrylic resin plate having a thickness of 2 mm was obtained in the same manner as in Example 1 except that 99.725 parts by weight of the partial polymer syrup and 0.075 parts by weight of Solvent Orange 86 were used. The evaluation results are shown in Table 1. Further, FIG. 3 shows a graph of light transmittance with respect to each wavelength [vertical axis: transmittance (%), horizontal axis: wavelength (nm)] measured by the “self-recording spectrophotometer U-4000”. 4 is a graph of the relative light emission intensity (dashed line) and the relative transmitted light intensity (solid line) of the LED light source with respect to each wavelength measured by the “instant multi-photometry system MCPD3000” [vertical axis; relative light emission intensity or relative transmitted light intensity, horizontal Axis; wavelength (nm)].

Comparative Example 1
A methacrylic resin plate having a thickness of 2 mm was obtained in the same manner as in Example 1 except that the partial polymer syrup was changed to 99.795 parts by weight and the solvent orange 86 was changed to 0.005 parts by weight. The evaluation results are shown in Table 1. FIG. 5 shows a graph of light transmittance (vertical axis: transmittance (%), horizontal axis: wavelength (nm)) with respect to each wavelength measured by the “self-recording spectrophotometer U-4000”. 6 is a graph of the relative light emission intensity (broken line) and the relative transmitted light intensity (solid line) of the LED light source with respect to each wavelength measured by the “instant multi-photometry system MCPD3000” [vertical axis: relative light emission intensity or relative transmitted light intensity, horizontal Axis; wavelength (nm)].

Comparative Example 2
A methacrylic resin plate having a thickness of 2 mm was obtained in the same manner as in Example 1 except that the partial polymer syrup was changed to 98.60 parts by weight and Solvent Orange 86 was changed to 1.20 parts by weight. The evaluation results are shown in Table 1. FIG. 7 shows a graph of light transmittance (vertical axis: transmittance (%), horizontal axis: wavelength (nm)) with respect to each wavelength measured by the “self-recording spectrophotometer U-4000”. 8 is a graph of the relative light emission intensity (dashed line) and the relative transmitted light intensity (solid line) of the LED light source for each wavelength measured by the “instant multi-photometry system MCPD3000” [vertical axis; relative light emission intensity or relative transmitted light intensity, horizontal Axis; wavelength (nm)].

Example 3
99.61 parts by weight of methyl methacrylate partial polymer syrup containing 5% by weight of polymethyl methacrylate, 0.03 parts by weight of Solvent Yellow 93 (“Yellow 3G” manufactured by LANXESS), Disperse Yellow 201 [LANXESS "Yellow 6G" 0.16 parts by weight, UV absorber [Sumisorb 300 "manufactured by Sumitomo Chemical Co., Ltd. 0.20 parts by weight, UV absorber [" Sumsorb 200 "manufactured by Sumitomo Chemical Co., Ltd.] 02 parts by weight and 0.08 parts by weight of 2,2′-azobis (isobutyronitrile) as a radical initiator were mixed. This mixture was poured into a cell having a gap of 2 mm composed of two glass plates and a vinyl chloride gasket, and the polymerization reaction was carried out by heating at 70 ° C. for 3 hours and then at 120 ° C. for 1 hour. A methacrylic resin plate having a thickness of 2 mm was obtained. The evaluation results are shown in Table 1. Further, FIG. 9 shows a graph of light transmittance with respect to each wavelength [vertical axis: transmittance (%), horizontal axis: wavelength (nm)] measured by the “self-recording spectrophotometer U-4000”. 10 is a graph of the relative light emission intensity (broken line) and the relative transmitted light intensity (solid line) of the LED light source with respect to each wavelength measured by the “instant multi-photometry system MCPD3000” [vertical axis: relative light emission intensity or relative transmitted light intensity, horizontal Axis; wavelength (nm)].

Comparative Example 3
99.79155 parts by weight of the partial polymer syrup, 0.00117 parts by weight of Solvent Yellow 93, 0.00728 parts by weight of Disperse Yellow 201, UV absorber [Sumisorb 200 manufactured by Sumitomo Chemical Co., Ltd. ]] Was performed in the same manner as in Example 3 except that 0.01 parts by weight was obtained, to obtain a methacrylic resin plate having a thickness of 2 mm. The evaluation results are shown in Table 1. Further, FIG. 11 shows a graph of light transmittance with respect to each wavelength [vertical axis: transmittance (%), horizontal axis: wavelength (nm)] measured by the “self-recording spectrophotometer U-4000”. 12 is a graph of the relative light emission intensity (dashed line) and the relative transmitted light intensity (solid line) of the LED light source with respect to each wavelength measured by the “instant multi-photometry system MCPD3000” [vertical axis; relative light emission intensity or relative transmitted light intensity, horizontal Axis; wavelength (nm)].

Claims (6)

  Resin for LED lighting cover having an absorption limit wavelength of 470 to 530 nm when it is made into a plate shape with a thickness of 2 mm, and a transmittance of light with a wavelength of 555 to 800 nm when made into a plate shape with a thickness of 2 mm is 80% or more Composition.   The resin composition is at least selected from the group consisting of methacrylic resin, polystyrene resin, polyvinyl chloride resin, acrylonitrile-styrene copolymer resin, methyl methacrylate-styrene copolymer resin and acrylonitrile-butadiene-styrene copolymer resin. 98 to 99.989 parts by weight of one kind of resin, 0.01 to 1 part by weight of an orange dye and / or yellow dye having a maximum absorption wavelength of 500 nm or less, and an ultraviolet ray having a maximum absorption wavelength of 400 nm or less The resin composition for an LED lighting cover according to claim 1, comprising 0.001 to 1 part by weight of an absorbent.   The resin composition for an LED lighting cover according to claim 2, wherein the orange dye is Solvent Orange 86 and / or Solvent Orange 60.   The resin composition for LED lighting cover according to claim 2, wherein the yellow dye is Solvent Yellow 93 and / or Disperse Yellow 201.   The resin composition for an LED lighting cover according to any one of claims 2 to 4, wherein the ultraviolet absorber is a benzotriazole compound and / or a hindered amine compound.   Furthermore, the resin composition for LED lighting covers in any one of Claims 1-5 used in a semiconductor element manufacturing factory.

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