TWI407151B - Light diffuser plate, multilayer light diffuser plate comprising the same, and method for decreasing a total light transmittance of a transparent resin - Google Patents
Light diffuser plate, multilayer light diffuser plate comprising the same, and method for decreasing a total light transmittance of a transparent resin Download PDFInfo
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- TWI407151B TWI407151B TW097113822A TW97113822A TWI407151B TW I407151 B TWI407151 B TW I407151B TW 097113822 A TW097113822 A TW 097113822A TW 97113822 A TW97113822 A TW 97113822A TW I407151 B TWI407151 B TW I407151B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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Abstract
Description
本發明有關一種光擴散板。The present invention relates to a light diffusing plate.
如圖1所示，彩色液晶顯示器包含一影像顯示器(4)與一從影像顯示器(4)背面照明之光源(5)，並且廣泛用作液晶電視或其他之顯示器。該影像顯示器(4)通常包含一液晶單元(1)、設於該液晶單元(1)各側之偏光片(2)以及使通過該液晶單元之透射光具有顏色以顯示彩色影像的濾色片(3)。在介於光源(5)與影像顯示器(4)之間的光徑上，設置一光擴散板(6)以將從冷陰極螢光燈(5)所發出的光均勻地照明該影像顯示器(4)(JP－A－2001－305335)。As shown in FIG. 1, the color liquid crystal display includes an image display (4) and a light source (5) illuminated from the back of the image display (4), and is widely used as a liquid crystal television or other display. The image display (4) generally comprises a liquid crystal cell (1), a polarizer (2) disposed on each side of the liquid crystal cell (1), and a color filter for causing the transmitted light passing through the liquid crystal cell to have a color to display a color image. (3). A light diffusing plate (6) is disposed on the optical path between the light source (5) and the image display (4) to uniformly illuminate the image display from the light emitted from the cold cathode fluorescent lamp (5) ( 4) (JP-A-2001-305335).
作為該光擴散板(6)，一通常使用由包含諸如苯乙烯之透明樹脂和光擴散體的樹脂組成物所製成之光擴散板，而所企求的是能以少量光擴散體充分擴散透射光的光擴散體。As the light diffusing plate (6), a light diffusing plate made of a resin composition containing a transparent resin such as styrene and a light diffusing body is usually used, and it is desirable to sufficiently diffuse transmitted light with a small amount of light diffusing body. Light diffuser.
本發明的目的為提供使用較少量光擴散體而具有高度光擴散性質之光擴散板。It is an object of the present invention to provide a light diffusing plate having a high degree of light diffusing properties using a relatively small amount of light diffusing body.
因此，本發明提供一種光擴散板，其包括含有透明樹脂與光擴散體之透明樹脂組成物，其中該光擴散體之平均粒徑為0.6 μm至1.5 μm且粒徑標準差為0.01 μm至0.5 μm，該透明樹脂與光擴散體間之折射率差的絕對值|△n|為至少0.05。Accordingly, the present invention provides a light diffusing plate comprising a transparent resin composition comprising a transparent resin and a light diffuser, wherein the light diffuser has an average particle diameter of from 0.6 μm to 1.5 μm and a particle diameter standard deviation of from 0.01 μm to 0.5 Μm, the absolute value of the refractive index difference between the transparent resin and the light diffuser |Δn| is at least 0.05.
本發明之光擴散板以少量光擴散體達到高度光擴散性質。因此，可減少光擴散體數量，或可減低令該光擴散板厚度。The light diffusing plate of the present invention achieves a high light diffusing property with a small amount of light diffusing body. Therefore, the number of light diffusers can be reduced, or the thickness of the light diffusing plate can be reduced.
作為本發明該光擴散板中所使用之透明樹脂，可使用傳統光擴散板中所使用的任何透明樹脂。該透明樹脂之實例包括苯乙烯系樹脂、聚甲基丙烯酸甲酯、聚碳酸酯、環烯聚合物、環烯共聚物、聚丙烯等等。As the transparent resin used in the light diffusing plate of the present invention, any transparent resin used in a conventional light diffusing plate can be used. Examples of the transparent resin include styrene resin, polymethyl methacrylate, polycarbonate, cycloolefin polymer, cycloolefin copolymer, polypropylene, and the like.
以該苯乙烯系樹脂總重量計，本發明中所使用之苯乙烯系樹脂包含50至100重量%之苯乙烯系單體單元。該苯乙烯系單體之實例包括苯乙烯與經取代苯乙烯。該經取代苯乙烯之實例包括鹵化苯乙烯，諸如氯苯乙烯、溴苯乙烯等等；經烷基取代之苯乙烯，諸如乙烯基甲苯、α－甲基苯乙烯等等；及類似物。該苯乙烯系單體可獨自使用或其中二或更多者合併使用。The styrene-based resin used in the present invention contains 50 to 100% by weight of a styrene-based monomer unit based on the total weight of the styrene resin. Examples of the styrenic monomer include styrene and substituted styrene. Examples of the substituted styrene include halogenated styrene such as chlorostyrene, bromostyrene, and the like; alkyl-substituted styrene such as vinyl toluene, α-methylstyrene, and the like; and the like. The styrene monomer may be used alone or in combination of two or more thereof.
由抗吸濕性觀點來看，本發明中所使用之較佳透明樹脂係聚苯乙烯、苯乙烯－甲基丙烯酸甲酯共聚物、環烯聚合物與共聚物以及聚丙烯。尤以聚苯乙烯為佳。From the viewpoint of moisture absorption resistance, preferred transparent resins used in the present invention are polystyrene, styrene-methyl methacrylate copolymer, cycloolefin polymer and copolymer, and polypropylene. Especially polystyrene is preferred.
就耐熱性觀點來看，本發明中所使用之較佳透明樹脂為苯乙烯系單體－甲基丙烯酸共聚物。此處，該苯乙烯系單體－甲基丙烯酸共聚物意指一種令苯乙烯系單體與甲基丙烯酸共聚而製備之共聚物。從耐熱性觀點來看，該苯乙烯系單體－甲基丙烯酸共聚物中之苯乙烯系單體單元的含 量通常為80莫耳%至95莫耳%，較佳為88莫耳%至93莫耳%，而甲基丙烯酸單元之含量為20莫耳%至5莫耳%，較佳為12莫耳%至7莫耳%。From the viewpoint of heat resistance, a preferred transparent resin used in the present invention is a styrene monomer-methacrylic acid copolymer. Here, the styrene monomer-methacrylic acid copolymer means a copolymer prepared by copolymerizing a styrene monomer with methacrylic acid. From the viewpoint of heat resistance, the content of the styrene monomer unit in the styrene monomer-methacrylic acid copolymer The amount is usually from 80 mol% to 95 mol%, preferably from 88 mol% to 93 mol%, and the content of the methacrylic acid unit is from 20 mol% to 5 mol%, preferably 12 mol%. % to 7% by mole.
除了苯乙烯系單體與甲基丙烯酸之外，該苯乙烯系單體－甲基丙烯酸共聚物可包含其他單體單元。該其他單體之實例包括甲基丙烯酸酯(例如甲基丙烯酸甲酯、甲基丙烯酸乙酯、甲基丙烯酸丁酯、甲基丙烯酸環己酯、甲基丙烯酸十八酯、甲基丙烯酸苯酯、甲基丙烯酸苄酯、甲基丙烯酸2－乙基己酯、甲基丙烯酸2－羥基乙酯、甲基丙烯酸金剛烷酯、甲基丙烯酸三環癸酯、甲基丙烯酸葑酯、甲基丙烯酸降酯、甲基丙烯酸降基甲酯、等等)、丙烯酸酯(例如丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯、丙烯酸環己酯、丙烯酸苯酯、丙烯酸苄酯、丙烯酸2－乙基己酯、丙烯酸2－羥基乙酯、丙烯酸三環癸酯、等等)、不飽和酸類(例如丙烯酸、等等)、丙烯腈、甲基丙烯腈、順丁烯二酸、苯基順丁烯二醯亞胺、環己基順丁烯二醯亞胺、戊二酸酐、戊二醯亞胺、及類似物。此等單體可獨自使用或其中二或更多者併用。The styrene monomer-methacrylic acid copolymer may contain other monomer units in addition to the styrene monomer and methacrylic acid. Examples of the other monomer include methacrylate (e.g., methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, octadecyl methacrylate, phenyl methacrylate). Benzyl methacrylate, 2-ethylhexyl methacrylate, 2-hydroxyethyl methacrylate, adamantyl methacrylate, tricyclodecyl methacrylate, decyl methacrylate, methacrylic acid drop Ester, methacrylic acid Methyl ester, etc.), acrylate (such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate Ester, tricyclodecyl acrylate, etc.), unsaturated acids (eg acrylic acid, etc.), acrylonitrile, methacrylonitrile, maleic acid, phenyl maleimide, cyclohexyl cis Butylenediimide, glutaric anhydride, pentaneimine, and the like. These monomers may be used alone or in combination of two or more thereof.
該苯乙烯系單體－甲基丙烯酸共聚物通常呈透明狀。本發明中，可使用市售苯乙烯系單體－甲基丙烯酸共聚物。該市售苯乙烯系單體－甲基丙烯酸共聚物之實例包括TOYO STYROLT080(由Toyo Styrene Co.,Ltd.所製)、RyulexA14(由Dainippon Ink and Chemicals,Inc.所製)、G9001(由PS Japan,Co.,Ltd.所製)、及類似者。The styrene monomer-methacrylic acid copolymer is usually transparent. In the present invention, a commercially available styrene monomer-methacrylic acid copolymer can be used. Examples of the commercially available styrenic monomer-methacrylic acid copolymer include TOYO STYROL T080 (manufactured by Toyo Styrene Co., Ltd.), Ryulex A14 (manufactured by Dainippon Ink and Chemicals, Inc.), G9001 (manufactured by PS Japan, Co., Ltd.), and the like.
本發明中所使用之光擴散體係當分散於光擴散板之透明樹脂中時能使通過該光擴散板之光線擴散的材料。The light diffusing system used in the present invention is a material which can diffuse light passing through the light diffusing plate when dispersed in the transparent resin of the light diffusing plate.
本發明中所使用之光擴散體的平均粒徑通常為0.6 μm至1.5 μm，較佳為至少0.65 μm，然而以1.2 μm或更小為佳，以0.9 μm或更小更佳，特別是0.85 μm或更小。若該平均粒徑不過小也不過大，則可減少待添加之光擴散體的數量。The light diffuser used in the present invention has an average particle diameter of usually 0.6 μm to 1.5 μm, preferably at least 0.65 μm, preferably 1.2 μm or less, more preferably 0.9 μm or less, particularly 0.85. Mm or less. If the average particle diameter is not too small or too large, the amount of the light diffusing body to be added can be reduced.
該光擴散體粒徑的標準差較佳為0.5 μm或更小，更佳為0.2 μm或更小。該光擴散體粒徑的標準差理想值為0 μm，但就成本考量，其通常為至少0.01 μm。The standard deviation of the particle diameter of the light diffuser is preferably 0.5 μm or less, more preferably 0.2 μm or less. The standard deviation of the particle size of the light diffuser is preferably 0 μm, but it is usually at least 0.01 μm in terms of cost.
待添加於該透明樹脂之光擴散體數量可視透明樹脂與光擴散體間之折射率差的絕對值|△n|與所需之總透光率而隨意選擇。該光擴散體之數量通常為每100重量份透明樹脂0.1重量份至20重量份，較佳為0.3至3重量份，更佳為0.5至2重量份。The number of light diffusers to be added to the transparent resin can be arbitrarily selected by using the absolute value of the refractive index difference between the transparent resin and the light diffuser |Δn| and the desired total light transmittance. The amount of the light diffusing body is usually from 0.1 part by weight to 20 parts by weight per 100 parts by weight of the transparent resin, preferably from 0.3 to 3 parts by weight, more preferably from 0.5 to 2 parts by weight.
此處，該光擴散體之平均粒徑與粒徑標準差係以5000倍、10000倍或50000倍放大倍率拍攝該光擴散體粒子之掃描電子顯微鏡(SEM)照片，藉由三點圓半徑法測量隨機選擇之40個粒子的半徑，計算該等粒子之直徑(即，粒徑)，然後從所獲得之粒徑計算平均粒徑與粒徑標準差而得。Here, the average particle diameter of the light diffuser and the standard deviation of the particle diameter are taken by scanning electron microscope (SEM) photographs of the light diffuser particles at a magnification of 5000 times, 10000 times, or 50,000 times, by a three-point circle radius method. The radius of the randomly selected 40 particles is measured, and the diameter (i.e., particle diameter) of the particles is calculated, and then the average particle diameter and the particle diameter standard deviation are calculated from the obtained particle diameter.
本發明中所使用之光擴散體的材料並無特定限制，而且只要該透明樹脂與該光擴散體間之折射率差的絕對值|△n|在本發明範圍內，則可使用有機材料或無機材料之任 何粒子。該折射率差的絕對值|△n|通常為至少0.05(|△n|≧0.05)，較佳為至少0.10(|△n|≧0.10)。當該折射率差夠大時，可減少該光擴散體之數量。The material of the light diffuser used in the present invention is not particularly limited, and as long as the absolute value of the refractive index difference between the transparent resin and the light diffuser |Δn| is within the scope of the present invention, an organic material or Inorganic material What particles. The absolute value of the refractive index difference |Δn| is usually at least 0.05 (|Δn|≧0.05), preferably at least 0.10 (|Δn|≧0.10). When the refractive index difference is large enough, the number of the light diffusers can be reduced.
無機粒子之實例包括碳酸鈣粒子、硫酸鋇粒子、氧化鈦粒子、氫氧化鋁粒子、矽石粒子、玻璃粒子、滑石粒子、雲母粒子、白碳粒子、氧化鎂粒子、氧化鋅粒子、等等。該等無機粒子可利用諸如脂肪酸之表面處理劑予以表面處理。Examples of the inorganic particles include calcium carbonate particles, barium sulfate particles, titanium oxide particles, aluminum hydroxide particles, vermiculite particles, glass particles, talc particles, mica particles, white carbon particles, magnesium oxide particles, zinc oxide particles, and the like. The inorganic particles may be surface-treated with a surface treatment agent such as a fatty acid.
有機粒子之實例包括苯乙烯系樹脂粒子、丙烯酸系樹脂粒子、聚矽氧粒子、等等。較佳為使用丙烯酸系樹脂粒子或聚矽氧粒子。該苯乙烯系樹脂粒子可為交聯苯乙烯系樹脂粒子或高分子量苯乙烯系樹脂粒子。該丙烯酸系樹脂粒子可為交聯丙烯酸系樹脂粒子或高分子量丙烯酸系樹脂粒子。該等交聯樹脂粒子(諸如該交聯苯乙烯系樹脂粒子與該交聯丙烯酸系樹脂粒子)意指當溶解於室溫(約25℃)之丙酮時具有之凝膠部分為至少10%的樹脂粒子。高分子量樹脂粒子(諸如該高分子量苯乙烯系樹脂粒子與該高分子量丙烯酸系樹脂粒子)意指具有諸如500,000至5,000,000之重量平均分子量的高分子量樹脂粒子。Examples of the organic particles include styrene resin particles, acrylic resin particles, polyfluorene oxide particles, and the like. It is preferred to use acrylic resin particles or polysiloxane particles. The styrene resin particles may be crosslinked styrene resin particles or high molecular weight styrene resin particles. The acrylic resin particles may be crosslinked acrylic resin particles or high molecular weight acrylic resin particles. The crosslinked resin particles (such as the crosslinked styrene resin particles and the crosslinked acrylic resin particles) mean that the gel portion has at least 10% when dissolved in acetone at room temperature (about 25 ° C). Resin particles. The high molecular weight resin particles such as the high molecular weight styrene resin particles and the high molecular weight acrylic resin particles mean high molecular weight resin particles having a weight average molecular weight of, for example, 500,000 to 5,000,000.
該苯乙烯系樹脂粒子的實例包括：(1)高分子量苯乙烯系樹脂粒子，其係藉由聚合苯乙烯系單體，或藉由聚合含有至少50重量%之苯乙烯系單體與在分子中具有一個可自由基聚合之雙鍵的單體的單體混合物而製備；與 (2)交聯苯乙烯系樹脂粒子，其係藉由聚合含有苯乙烯系單體與在分子中具有至少兩個可自由基聚合之雙鍵的單體之單體混合物，或藉由聚合含有至少50重量%之苯乙烯系單體、在分子中具有一個可自由基聚合之雙鍵的單體及在分子中具有至少兩個可自由基聚合之雙鍵的單體之單體混合物而製備。Examples of the styrene resin particles include: (1) high molecular weight styrene resin particles by polymerizing a styrene monomer or by polymerizing at least 50% by weight of a styrene monomer with a molecule Prepared by a monomer mixture having a monomer capable of radically polymerizing double bonds; (2) a crosslinked styrene resin particle by polymerizing a monomer mixture containing a styrene monomer and a monomer having at least two radically polymerizable double bonds in a molecule, or by polymerization Preparing a monomer mixture of at least 50% by weight of a styrene monomer, a monomer having a radically polymerizable double bond in the molecule, and a monomer having at least two radically polymerizable double bonds in the molecule .
該苯乙烯系單體之實例包括苯乙烯與其衍生物。該苯乙烯衍生物之非限制性實例包括鹵化苯乙烯，諸如氯苯乙烯、溴苯乙烯、等等；經烷基取代之苯乙烯，諸如乙烯基甲苯、α－甲基苯乙烯、等等；及類似物。該苯乙烯系單體可獨自使用或其中二或更多者合併使用。Examples of the styrenic monomer include styrene and its derivatives. Non-limiting examples of the styrene derivative include halogenated styrene such as chlorostyrene, bromostyrene, and the like; alkyl-substituted styrene such as vinyl toluene, α-methylstyrene, and the like; And similar. The styrene monomer may be used alone or in combination of two or more thereof.
只要有別於苯乙烯系單體，該在分子中具有一個可自由基聚合之雙鍵的單體並無特定限制。此種單體之具體實例包括(甲基)丙烯酸酯類諸如(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丁酯、(甲基)丙烯酸環己酯、(甲基)丙烯酸苯酯、(甲基)丙烯酸苄酯、(甲基)丙烯酸2－乙基己酯、(甲基)丙烯酸2－羥基乙酯、等等；丙烯腈；及類似物。其中，以丙烯酸烷酯類為佳，諸如丙烯酸甲酯。此等單體可獨自使用或其中二或更多者併用。The monomer having a radically polymerizable double bond in the molecule is not particularly limited as long as it is different from the styrene monomer. Specific examples of such a monomer include (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, ( Phenyl methacrylate, benzyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, etc.; acrylonitrile; and the like. Among them, alkyl acrylates such as methyl acrylate are preferred. These monomers may be used alone or in combination of two or more thereof.
此處，「(甲基)丙烯酸酯」意指「甲基丙烯酸酯與丙烯酸酯」。Here, "(meth) acrylate" means "methacrylate and acrylate".
該在分子中具有至少兩個可自由基聚合之雙鍵的單體係具有兩個或更多個可自由基聚合的雙鍵並且可與上述單體共聚之單體，但共軛二烯除外。此種單體之具體實例包 括二(甲基)丙烯酸烷基二醇酯，諸如二(甲基)丙烯酸1,4－丁二醇酯、二(甲基)丙烯酸新戊基二醇酯、等等；二(甲基)丙烯酸伸烷基二醇酯，諸如二(甲基)丙烯酸乙二醇酯、(甲基)丙烯酸二甘醇酯、二(甲基)丙烯酸四甘醇酯、二(甲基)丙烯酸丙二醇酯、二(甲基)丙烯酸四丙二醇酯、等等；多官能基芳族化合物，諸如二乙烯苯、苯二甲酸二烯丙酯、等等；多元醇之二(甲基)丙烯酸酯，諸如三(甲基)丙烯酸三羥甲基丙酯、四(甲基)丙烯酸季戊四醇酯、等等；及類似物。此等單體可獨自使用或其中二或更多者併用。The single system having at least two radically polymerizable double bonds in the molecule has two or more radically polymerizable double bonds and can be copolymerized with the above monomers, except for the conjugated dienes . Specific examples of such monomers An alkyl (meth) acrylate such as 1,4-butane di(meth)acrylate, neopentyl glycol di(meth)acrylate, etc.; di(methyl) An alkylene glycol acrylate such as ethylene glycol di(meth)acrylate, diethylene glycol (meth)acrylate, tetraethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, Tetrapropylene glycol di(meth)acrylate, etc.; polyfunctional aromatic compounds such as divinylbenzene, diallyl phthalate, etc.; di(meth)acrylates of polyols, such as three ( Trimethylolpropyl methacrylate, pentaerythritol tetra(meth)acrylate, and the like; and the like. These monomers may be used alone or in combination of two or more thereof.
該丙烯酸系樹脂粒子之實例包括：(1)高分子量丙烯酸系樹脂粒子，其係藉由聚合丙烯酸系單體，或藉由聚合含有至少50重量%之丙烯酸系單體與在分子中具有一個可自由基聚合之雙鍵的單體之單體混合物而製備；與(2)交聯丙烯酸系樹脂粒子，其係藉由聚合含有丙烯酸系單體與在分子中具有至少兩個可自由基聚合之雙鍵的單體之單體混合物，或藉由聚合含有至少50重量%之丙烯酸系單體、在分子中具有一個可自由基聚合之雙鍵的單體及在分子中具有至少兩個可自由基聚合之雙鍵的單體之單體混合物而製備。Examples of the acrylic resin particles include: (1) high molecular weight acrylic resin particles by polymerizing an acrylic monomer, or by polymerizing at least 50% by weight of an acrylic monomer and having one in the molecule Preparing a monomer mixture of a radically polymerized double bond monomer; and (2) crosslinking the acrylic resin particle by polymerizing the acrylic monomer and having at least two radically polymerizable molecules in the molecule a monomer mixture of a double bond monomer, or a monomer having at least 50% by weight of an acrylic monomer, having a radically polymerizable double bond in the molecule, and having at least two freely available in the molecule It is prepared by polymerizing a monomer mixture of monomers of double bonds.
該丙烯酸系單體之實例包括(甲基)丙烯酸酯類(例如(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丁酯、(甲基)丙烯酸環己酯、(甲基)丙烯酸苯酯、(甲基)丙 烯酸苄酯、(甲基)丙烯酸2－乙基己酯、(甲基)丙烯酸2－羥基乙酯、等等)、丙烯酸、甲基丙烯酸、及類似物。此等丙烯酸系單體可獨自使用或其中二或更多者併用。Examples of the acrylic monomer include (meth) acrylates (for example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, Phenyl (meth) acrylate, (meth) propyl Benzyl acrylate, 2-ethylhexyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, etc.), acrylic acid, methacrylic acid, and the like. These acrylic monomers may be used alone or in combination of two or more thereof.
只要有別於該丙烯酸系單體，該在分子中具有一個可自由基聚合之雙鍵的單體並無特定限制。此種單體之實例包括苯乙烯與苯乙烯衍生物。該苯乙烯衍生物之具體實例包括鹵化苯乙烯，諸如氯苯乙烯、溴苯乙烯、等等；經烷基取代之苯乙烯，諸如乙烯基甲苯、α－甲基苯乙烯、等等；及類似物。其中，以苯乙烯為佳。此等單體可獨自使用或其中二或更多者併用。The monomer having a radically polymerizable double bond in the molecule is not particularly limited as long as it is different from the acrylic monomer. Examples of such monomers include styrene and styrene derivatives. Specific examples of the styrene derivative include halogenated styrene such as chlorostyrene, bromostyrene, and the like; alkyl-substituted styrene such as vinyl toluene, α-methylstyrene, and the like; and the like Things. Among them, styrene is preferred. These monomers may be used alone or in combination of two or more thereof.
該分子中具有至少兩個可自由基聚合之雙鍵的單體係具有二或更多個可自由基聚合之雙鍵並且可與上述單體共聚之單體，但共軛二烯除外。此種單體之實例包括上述單體以及(甲基)丙烯酸烯丙酯。A single system having at least two radically polymerisable double bonds in the molecule has two or more radically polymerizable double bonds and can be copolymerized with the above monomers, except for the conjugated dienes. Examples of such a monomer include the above monomers and allyl (meth)acrylate.
作為該丙烯酸系樹脂粒子，可使用具有一內層與一外層之核－殼型粒子。As the acrylic resin particles, core-shell type particles having an inner layer and an outer layer can be used.
該核－殼型粒子之內層可包含一種共聚物，該共聚物係藉由聚合在分子中具有至少兩個碳－碳雙鍵之多官能基單體與包含丙烯酸丁酯作為主要組份之單官能基單體而製得，以所有單體總重量計，該多官能基單體之數量為0.1至10重量%，較佳為0.2至5重量%。該包含丙烯酸丁酯作為主要組份之單官能基單體意指該單體含有至少50重量%之丙烯酸丁酯與隨意之其他可與丙烯酸丁酯共聚的不飽和單體。The inner layer of the core-shell type particle may comprise a copolymer by polymerizing a polyfunctional monomer having at least two carbon-carbon double bonds in the molecule and containing butyl acrylate as a main component. The monofunctional monomer is prepared in an amount of from 0.1 to 10% by weight, preferably from 0.2 to 5% by weight, based on the total weight of all monomers. The monofunctional monomer comprising butyl acrylate as the main component means that the monomer contains at least 50% by weight of butyl acrylate and optionally other unsaturated monomers copolymerizable with butyl acrylate.
該多官能基單體之具體實例包括二(甲基)丙烯酸乙二醇酯、二甲基丙烯酸1,3－丁二醇酯、三丙烯酸三羥甲基丙酯、四丙烯酸季戊四醇酯、三烯丙基氰尿酸二乙烯苯酯、桂皮酸烯丙酯、(甲基)丙烯酸烯丙酯、山梨酸烯丙酯、苯二甲酸二烯丙酯、順丁烯二酸二烯丙酯、等等。較佳為使用(甲基)丙烯酸烯丙酯。Specific examples of the polyfunctional monomer include ethylene glycol di(meth)acrylate, 1,3-butylene glycol dimethacrylate, trimethylolpropyl methacrylate, pentaerythritol tetraacrylate, and triene. Divinyl phenyl cyanurate, allyl cinnamate, allyl (meth) acrylate, allyl sorbate, diallyl phthalate, diallyl maleate, etc. . It is preferred to use allyl (meth)acrylate.
該核－殼型粒子之外層可包含一種共聚物，其係藉由聚合包含甲基丙烯酸甲酯作為主要組份的單官能基單體而製得。該外層可為單層或隨意之具有二或更多層之多重層。該包含甲基丙烯酸甲酯作為主要組份之單官能基單體意指該單體含有至少50重量%之甲基丙烯酸甲酯以及隨意之其他可與甲基丙烯酸甲酯共聚的乙烯式不飽和單體。The outer layer of the core-shell type particle may comprise a copolymer obtained by polymerizing a monofunctional monomer comprising methyl methacrylate as a main component. The outer layer can be a single layer or a random multiple layer having two or more layers. The monofunctional monomer comprising methyl methacrylate as a main component means that the monomer contains at least 50% by weight of methyl methacrylate and optionally other ethylenic unsaturation copolymerizable with methyl methacrylate. monomer.
該核殼－型粒子中，內層對外層之重量比通常為1：9至9：1。In the core-shell type particle, the weight ratio of the inner layer to the outer layer is usually from 1:9 to 9:1.
該苯乙烯系樹脂粒子與該丙烯酸系樹脂粒子可藉由傳統聚合方法聚合該單體或該等單體而製造，此等傳統聚合方法係諸如懸浮聚合、微懸浮聚合、乳液聚合、分散聚合、等等。可藉由以乳液聚合為基礎之連續兩步驟聚合法輕易製造該核－殼型粒子。亦即，首先藉由乳液聚合形成構成核心之內層，然後在該內層存在下藉由乳液聚合而形成外層。The styrene resin particles and the acrylic resin particles can be produced by polymerizing the monomer or the monomers by a conventional polymerization method such as suspension polymerization, microsuspension polymerization, emulsion polymerization, dispersion polymerization, and many more. The core-shell particles can be easily produced by a two-step polymerization process based on emulsion polymerization. That is, the inner layer constituting the core is first formed by emulsion polymerization, and then the outer layer is formed by emulsion polymerization in the presence of the inner layer.
該光擴散體之粒子形狀並無特定限制，惟以球形粒子為佳。The particle shape of the light diffuser is not particularly limited, but spherical particles are preferred.
本發明之光擴散板的厚度並無限制。其通常為5mm 或更小，較佳為3mm或更小，然而就該板強度而言，其通常至少為0.8mm，較佳為至少1mm。The thickness of the light diffusing plate of the present invention is not limited. It is usually 5mm Or smaller, preferably 3 mm or less, however, in terms of the strength of the sheet, it is usually at least 0.8 mm, preferably at least 1 mm.
本發明之光擴散板可隨意含有傳統添加劑中之任一者。該等添加劑之具體實例包括抗靜電劑(例如烷基磺酸鈉、烷基硫酸鈉、硬脂酸單甘油酯、聚醚酯醯胺、等等)、抗氧化劑(例如位阻酚、等等)、阻焰劑(例如磷酸酯、等等)、潤滑劑(例如棕櫚酸、硬脂醇、等等)、光安定劑(例如位阻胺、等等)、抗氧化劑(例如位阻酚、等等)、染料、光學增亮劑、加工安定劑、UV吸收劑(例如苯并***UV吸收劑、二苯甲酮UV吸收劑、氰基丙烯酸酯UV吸收劑、丙二酸酯UV吸收劑、草醯替苯胺UV吸收劑、醋酸酯UV吸收劑、三UV吸收劑、水楊酸酯UV吸收劑、苯甲酸酯UV吸收劑、等等)及類似者。此等添加劑可獨自使用或其中二或更多者併用。The light diffusing plate of the present invention may optionally contain any of conventional additives. Specific examples of such additives include antistatic agents (e.g., sodium alkyl sulfonate, sodium alkyl sulfate, monoglyceryl stearate, polyether ester decylamine, etc.), antioxidants (e.g., hindered phenols, etc.) ), flame retardant (such as phosphates, etc.), lubricants (such as palmitic acid, stearyl alcohol, etc.), light stabilizers (such as hindered amines, etc.), antioxidants (such as hindered phenols, Etc.), dyes, optical brighteners, processing stabilizers, UV absorbers (eg benzotriazole UV absorbers, benzophenone UV absorbers, cyanoacrylate UV absorbers, malonate UV absorbers) Agent, grasshopper aniline UV absorber, acetate UV absorber, three UV absorbers, salicylate UV absorbers, benzoate UV absorbers, and the like) and the like. These additives may be used alone or in combination of two or more thereof.
本發明之光擴散板可藉由帶式摻合機、Henschel混合機、Banbury混合機、鼓式桶、單螺桿擠出機、雙螺桿擠出機、多螺桿擠出機等等來熔融捏合透明樹脂與光擴散體，並使所得之熔體通過模擠出形成板而製得。當該光擴散板含有添加劑時，該等添加劑通常與透明樹脂及該光擴散體一起熔融捏合。或者，本發明之光擴散板可藉由射出成形法而製造，其中將上述熔融捏合步驟中所製備之熔體注入一射出模具。The light diffusing plate of the present invention can be melt-kneaded and transparent by a belt blender, a Henschel mixer, a Banbury mixer, a drum barrel, a single screw extruder, a twin screw extruder, a multi-screw extruder or the like. The resin and the light diffuser are obtained, and the obtained melt is extruded through a die to form a sheet. When the light diffusing plate contains an additive, the additives are usually melt-kneaded together with the transparent resin and the light diffusing body. Alternatively, the light diffusing plate of the present invention can be produced by an injection molding method in which the melt prepared in the above melt-kneading step is injected into an injection mold.
本發明之光擴散板隨意具有位於該板之至少一個表面上的包含透明樹脂與UV吸收劑之UV吸收層，並且可作 為多層光擴散板。此種多層光擴散板可防止因紫外線所造成之該板的變質。由於待包含在該UV吸收層中之UV吸收劑可為傳統UV吸收劑，其實例包括苯并***UV吸收劑、二苯甲酮UV吸收劑、氰基丙烯酸酯UV吸收劑、丙二酸酯UV吸收劑、草醯替苯胺UV吸收劑、醋酸酯UV吸收劑、三UV吸收劑、水楊酸酯UV吸收劑、苯甲酸酯UV吸收劑、等等。The light diffusing plate of the present invention optionally has a UV absorbing layer containing a transparent resin and a UV absorber on at least one surface of the plate, and can function as a multilayer light diffusing plate. Such a multilayer light diffusing plate prevents deterioration of the board due to ultraviolet rays. Since the UV absorber to be contained in the UV absorbing layer may be a conventional UV absorber, examples thereof include a benzotriazole UV absorber, a benzophenone UV absorber, a cyanoacrylate UV absorber, malonic acid. Ester UV absorber, grassy aniline UV absorber, acetate UV absorber, three UV absorbers, salicylate UV absorbers, benzoate UV absorbers, and the like.
作為包含在該UV吸收層中之透明樹脂，較佳係使用甲基丙烯酸甲酯樹脂或苯乙烯系樹脂，而且更佳係使用甲基丙烯酸甲酯－苯乙烯共聚物。As the transparent resin contained in the UV absorbing layer, a methyl methacrylate resin or a styrene resin is preferably used, and a methyl methacrylate-styrene copolymer is more preferably used.
該甲基丙烯酸甲酯樹脂意指一種包含以構成該甲基丙烯酸甲酯樹脂之單體單元計至少50重量%之甲基丙烯酸甲酯單元的聚合物，且可為甲基丙烯酸甲酯之均聚物、或包含50重量%或更多甲基丙烯酸甲酯與50重量%或更少之其他可與甲基丙烯酸甲酯共聚之單體的共聚物。The methyl methacrylate resin means a polymer comprising at least 50% by weight of methyl methacrylate units constituting the monomer unit of the methyl methacrylate resin, and may be methyl methacrylate. a polymer, or a copolymer comprising 50% by weight or more of methyl methacrylate and 50% by weight or less of other monomers copolymerizable with methyl methacrylate.
該其他可與甲基丙烯酸甲酯共聚之單體的實例包括除甲基丙烯酸甲酯之外的甲基丙烯酸酯(例如甲基丙烯酸乙酯、甲基丙烯酸丁酯、甲基丙烯酸環己酯、甲基丙烯酸十八酯、甲基丙烯酸苯酯、甲基丙烯酸苄酯、甲基丙烯酸2－乙基己酯、甲基丙烯酸2－羥基乙酯、甲基丙烯酸金剛烷酯、甲基丙烯酸三環癸酯、甲基丙烯酸葑酯、甲基丙烯酸降酯、甲基丙烯酸降基甲酯、等等、丙烯酸酯(例如丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯、丙烯酸己酯、丙烯酸苯酯、丙烯酸苄酯、丙烯酸2－乙基己酯、丙烯酸2－ 羥基乙酯、丙烯酸三環癸酯、等等)、不飽和酸類(例如甲基丙烯酸、丙烯酸、等等)、丙烯腈、甲基丙烯腈、順丁烯二酸、苯基順丁烯二醯亞胺、環己基順丁烯二醯亞胺、戊二酸酐、戊二醯亞胺、苯乙烯系單體、及類似物。此等單體可獨自使用或其中二或更多者併用。作為該苯乙烯系單體，除了苯乙烯之外，可使用經取代苯乙烯。該甲基丙烯酸甲酯可包含戊二酸酐單元或戊二醯亞胺單元。Examples of the other monomer copolymerizable with methyl methacrylate include methacrylate other than methyl methacrylate (e.g., ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, Octadecyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate, 2-hydroxyethyl methacrylate, adamantyl methacrylate, tricyclomethacrylate Decyl ester, decyl methacrylate, methacrylic acid Ester, methacrylic acid Methyl ester, etc., acrylate (such as methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, phenyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, Tricyclodecyl acrylate, etc.), unsaturated acids (eg methacrylic acid, acrylic acid, etc.), acrylonitrile, methacrylonitrile, maleic acid, phenyl maleimide, ring Hexyl maleimide, glutaric anhydride, pentaneimine, styrenic monomers, and the like. These monomers may be used alone or in combination of two or more thereof. As the styrene-based monomer, substituted styrene can be used in addition to styrene. The methyl methacrylate may comprise a glutaric anhydride unit or a pentane imide unit.
該苯乙烯系樹脂意指一種包含以構成該苯乙烯系樹脂之單體單元計50至100重量%之苯乙烯系單體的樹脂。作為該苯乙烯系單體，除了苯乙烯之外，可使用經取代苯乙烯。該經取代苯乙烯之實例包括鹵化苯乙烯，諸如氯苯乙烯、溴苯乙烯、等等；經烷基取代之苯乙烯，諸如乙烯基甲苯、α－甲基苯乙烯、等等；及類似物。該苯乙烯系單體可獨自使用或其中二或更多者併用。The styrene-based resin means a resin containing 50 to 100% by weight of a styrene-based monomer based on the monomer unit constituting the styrene-based resin. As the styrene-based monomer, substituted styrene can be used in addition to styrene. Examples of the substituted styrene include halogenated styrene such as chlorostyrene, bromostyrene, and the like; alkyl-substituted styrene such as vinyl toluene, α-methylstyrene, and the like; . The styrene monomer may be used alone or in combination of two or more thereof.
可構成該苯乙烯系樹脂之其他單體的實例包括甲基丙烯酸甲酯及前述例示之可隨意構成該甲基丙烯酸甲酯樹脂之其他單體(苯乙烯除外)。Examples of other monomers which may constitute the styrene resin include methyl methacrylate and the other monomers exemplified above which can optionally constitute the methyl methacrylate resin (except styrene).
該UV吸收層中所包含之甲基丙烯酸甲酯樹脂或苯乙烯系樹脂可為苯乙烯與甲基丙烯酸甲酯之共聚物，亦即甲基丙烯酸甲酯－苯乙烯共聚物。該甲基丙烯酸甲酯－苯乙烯共聚物中之苯乙烯單元的含量通常為5重量%至95重量%，而甲基丙烯酸甲酯單元之含量通常為95重量%至5重量%。The methyl methacrylate resin or the styrene resin contained in the UV absorbing layer may be a copolymer of styrene and methyl methacrylate, that is, a methyl methacrylate-styrene copolymer. The content of the styrene unit in the methyl methacrylate-styrene copolymer is usually from 5% by weight to 95% by weight, and the content of the methyl methacrylate unit is usually from 95% by weight to 5% by weight.
本發明之光擴散板係在該透明樹脂中包含前文所界定 之光擴散體。因此，即使當光擴散體含量低時亦能降低該透明樹脂的總透光率。由於該總透光率已經藉由該光擴散體降低之透明樹脂能良好擴散通過該樹脂的光，所以本發明之光擴散板能以少量該光擴散體充分地擴散通過之光。因此，本發明亦提供一種用於降低透明樹脂之總透光率的方法，其包含添加用於本發明光擴散板中之光擴散體。The light diffusing plate of the present invention comprises the above defined in the transparent resin Light diffuser. Therefore, the total light transmittance of the transparent resin can be lowered even when the content of the light diffusing body is low. Since the transparent resin whose total light transmittance has been lowered by the light diffusing body can diffuse light through the resin well, the light diffusing plate of the present invention can sufficiently diffuse the light passing through the light diffusing body with a small amount. Accordingly, the present invention also provides a method for reducing the total light transmittance of a transparent resin comprising adding a light diffusing body for use in the light diffusing plate of the present invention.
茲以下列實施例例示說明本發明，此等實施例均非以任何方式限制本發明範圍。在該等實施例中，除非另外指示，否則「%」與「份」係以重量計。The invention is illustrated by the following examples, which are not intended to limit the scope of the invention in any way. In the examples, "%" and "parts" are by weight unless otherwise indicated.
根據JIS K 7361，使用混濁透光率計(HR－100，由MURAKAMI COLOR RESEARCH LABORATORY CO.,LTD.所製)測量總透光率Tt。The total light transmittance Tt was measured according to JIS K 7361 using a turbid light transmittance meter (HR-100, manufactured by MURAKAMI COLOR RESEARCH LABORATORY CO., LTD.).
將光擴散體之粒子壓實固定在樣本檯上，並令碳氣相沉積於其上，以製備樣本片。該樣本片上之光擴散體粒子的SEM照片係使用場發射掃描電子顯微鏡(FE－SEM S－420，由Hitachi Limited所製)並選用適於個別粒徑之放大倍率而攝得，該放大倍率為5000倍、10000倍與50000 倍。然後，藉由三點圓半徑法測量各粒子的半徑，並由所測得之半徑計算該粒子之直徑。The particles of the light diffuser are compacted and fixed on the sample stage, and carbon is vapor-deposited thereon to prepare a sample piece. The SEM photograph of the light diffusing body particles on the sample piece was obtained by a field emission scanning electron microscope (FE-SEM S-420, manufactured by Hitachi Limited) and selected for magnification of an individual particle diameter, and the magnification was obtained. 5000 times, 10,000 times and 50000 Times. Then, the radius of each particle is measured by a three-point circle radius method, and the diameter of the particle is calculated from the measured radius.
在該粒徑的上述測量方法中，隨機選擇40個粒子，並計算該等粒子之直徑。然後，計算該光擴散體之粒徑的平均值與標準差。In the above measurement method of the particle diameter, 40 particles are randomly selected, and the diameters of the particles are calculated. Then, the average value and the standard deviation of the particle diameters of the light diffusers were calculated.
於100份聚苯乙烯(HRM 40由Toyo Styrene Co.,Ltd.所製；折射率：1.59)中添加1份折射率為1.43、平均粒徑為2.49 μm且粒徑之標準差為0.14 μm的聚矽氧粒子，並予乾式摻合以獲得樹脂組成物。然後使用配備有多重歧管模之40 mm單螺桿擠出機(由Tanabe Plastics Co.,Ltd.所製)，以溫度範圍為190至260℃擠出模製該樹脂組成物，製得厚度為2 mm之單層光擴散板。該單層光擴散板之總透光率(下文稱為"Tt")為56.2%。To 100 parts of polystyrene (HRM 40 manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59), 1 part of a refractive index of 1.43, an average particle diameter of 2.49 μm, and a standard deviation of particle diameter of 0.14 μm were added. Polysiloxane particles were mixed and dry blended to obtain a resin composition. Then, using a 40 mm single-screw extruder equipped with a multi-manifold mold (manufactured by Tanabe Plastics Co., Ltd.), the resin composition was extrusion-molded at a temperature ranging from 190 to 260 ° C to obtain a thickness of 2 mm single-layer light diffuser. The total light transmittance (hereinafter referred to as "Tt") of the single-layer light diffusing plate was 56.2%.
以與比較實例1相同之方式製造一單層光擴散板，但於100份聚苯乙烯(HRM 40由Toyo Styrene Co.,Ltd.所製；折射率：1.59)中添加1份折射率為1.43、平均粒徑為2.17 μm且粒徑之標準差為0.29 μm的聚矽氧粒子。該厚度為2 mm之單層光擴散板的Tt為54.8%。A single-layer light-diffusing sheet was produced in the same manner as in Comparative Example 1, except that 100 parts of polystyrene (HRM 40 manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59) was added with 1 part of refractive index of 1.43. Polyfluorene oxide particles having an average particle diameter of 2.17 μm and a standard deviation of the particle diameter of 0.29 μm. The Tt of the single-layer light diffusing plate having a thickness of 2 mm was 54.8%.
以與比較實例1相同之方式製造一單層光擴散板，但於100份聚苯乙烯(HRM 40由Toyo Styrene Co.,Ltd.所製；折射率：1.59)中添加1份折射率為1.43、平均粒徑為0.67 μm且粒徑之標準差為0.07 μm的聚矽氧粒子。該厚度為2 mm之單層光擴散板的Tt為49.6%。A single-layer light-diffusing sheet was produced in the same manner as in Comparative Example 1, except that 100 parts of polystyrene (HRM 40 manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59) was added with 1 part of refractive index of 1.43. Polyfluorene oxide particles having an average particle diameter of 0.67 μm and a standard deviation of particle diameter of 0.07 μm. The Tt of the single-layer light diffusing plate having a thickness of 2 mm was 49.6%.
以與比較實例1相同之方式製造一單層光擴散板，但於100份聚苯乙烯(HRM 40由Toyo Styrene Co.,Ltd.所製；折射率：1.59)中添加1份折射率為1.43、平均粒徑為0.12 μm且粒徑之標準差為0.01 μm的聚矽氧粒子。該厚度為2 mm之單層光擴散板的Tt為55.0%。A single-layer light-diffusing sheet was produced in the same manner as in Comparative Example 1, except that 100 parts of polystyrene (HRM 40 manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59) was added with 1 part of refractive index of 1.43. Polyfluorene oxide particles having an average particle diameter of 0.12 μm and a standard deviation of the particle diameter of 0.01 μm. The Tt of the single-layer light diffusing plate having a thickness of 2 mm was 55.0%.
以與比較實例1相同之方式製造一單層光擴散板，但於100份聚苯乙烯(HRM 40由Toyo Styrene Co.,Ltd.所製；折射率：1.59)中添加1份折射率為1.49、平均粒徑為2.44 μm且粒徑之標準差為0.52 μm的丙烯酸系樹脂粒子。該厚度為2 mm之單層光擴散板的Tt為69.3%。A single-layer light-diffusing sheet was produced in the same manner as in Comparative Example 1, except that 100 parts of polystyrene (HRM 40 manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59) was added with 1 part of refractive index of 1.49. The acrylic resin particles having an average particle diameter of 2.44 μm and a standard deviation of the particle diameter of 0.52 μm. The Tt of the single-layer light diffusing plate having a thickness of 2 mm was 69.3%.
以與比較實例1相同之方式製造一單層光擴散板，但 於100份聚苯乙烯(HRM 40由Toyo Styrene Co.,Ltd.所製；折射率：1.59)中添加1份折射率為1.49、平均粒徑為0.85 μm且粒徑之標準差為0.03 μm的丙烯酸系樹脂粒子。該厚度為2 mm之單層光擴散板的Tt為55.1%。A single-layer light diffusing plate was fabricated in the same manner as in Comparative Example 1, but To 100 parts of polystyrene (HRM 40 manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59), 1 part of a refractive index of 1.49, an average particle diameter of 0.85 μm, and a standard deviation of particle diameter of 0.03 μm were added. Acrylic resin particles. The Tt of the single-layer light diffusing plate having a thickness of 2 mm was 55.1%.
以與比較實例1相同之方式製造一單層光擴散板，但於100份聚苯乙烯(HRM 40由Toyo Styrene Co.,Ltd.所製；折射率：1.59)中添加1份折射率為1.49、平均粒徑為0.50 μm且粒徑之標準差為0.04 μm的丙烯酸系樹脂粒子。該厚度為2 mm之單層光擴散板的Tt為70.2%。A single-layer light-diffusing sheet was produced in the same manner as in Comparative Example 1, except that 100 parts of polystyrene (HRM 40 manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59) was added with 1 part of refractive index of 1.49. An acrylic resin particle having an average particle diameter of 0.50 μm and a standard deviation of the particle diameter of 0.04 μm. The Tt of the single-layer light diffusing plate having a thickness of 2 mm was 70.2%.
結果彙總於表1。The results are summarized in Table 1.
於100份苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080(由Toyo Styrene Co.,Ltd.所製；折射率： 1.59；苯乙烯單元含量：90莫耳%，且甲基丙烯酸單元含量：10莫耳%(以NMR分析))中添加1份折射率為1.48、平均粒徑為1.00 μm且粒徑之標準差為0.05 μm的交聯丙烯酸系樹脂粒子，並予乾式摻合以獲得樹脂組成物。然後使用配備有多重歧管模之40 mm單螺桿擠出機(由Tanabe Plastics Co.,Ltd.所製)，以溫度範圍為190至260℃擠出模製該樹脂組成物，製得厚度為2 mm之光擴散板。該光擴散板之Tt為58.8%。100 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 (manufactured by Toyo Styrene Co., Ltd.; refractive index: 1.59; styrene unit content: 90 mol%, and methacrylic acid unit content: 10 mol% (by NMR analysis)) The crosslinked acrylic resin particles having a ratio of 1.48, an average particle diameter of 1.00 μm and a standard deviation of the particle diameter of 0.05 μm were dry-blended to obtain a resin composition. Then, using a 40 mm single-screw extruder equipped with a multi-manifold mold (manufactured by Tanabe Plastics Co., Ltd.), the resin composition was extrusion-molded at a temperature ranging from 190 to 260 ° C to obtain a thickness of 2 mm light diffuser. The light diffusing plate had a Tt of 58.8%.
以與上述相同方式製造厚度為2mm之光擴散板，但其中該交聯丙烯酸系樹脂粒子之數量改成1.5份或2.5份。其Tt分別為54.3%或50.5%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as above, except that the number of the crosslinked acrylic resin particles was changed to 1.5 parts or 2.5 parts. Its Tt is 54.3% or 50.5%, respectively.
以與實施例3相同之方式製造厚度為2mm之光擴散板，但使用1份折射率為1.49、平均粒徑為2.44 μm且粒徑之標準差為0.52 μm的交聯丙烯酸系樹脂粒子代替實施例3之交聯丙烯酸系樹脂粒子。該光擴散板之Tt為78.0%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as in Example 3, except that 1 part of crosslinked acrylic resin particles having a refractive index of 1.49, an average particle diameter of 2.44 μm, and a standard deviation of particle diameter of 0.52 μm were used instead. The crosslinked acrylic resin particle of Example 3. The light diffusing plate had a Tt of 78.0%.
以與上述相同方式製造厚度為2mm之光擴散板，但其中該交聯丙烯酸系樹脂粒子之數量改成1.5份或2.5份。其Tt分別為69.1%或60.1%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as above, except that the number of the crosslinked acrylic resin particles was changed to 1.5 parts or 2.5 parts. Its Tt is 69.1% or 60.1%, respectively.
以與實施例3相同之方式製造厚度為2mm之光擴散 板，但使用1份折射率為1.49、平均粒徑為0.85 μm且粒徑之標準差為0.03 μm的交聯丙烯酸系樹脂粒子代替實施例3之交聯丙烯酸系樹脂粒子。該光擴散板之Tt為57.8%。Light diffusion of 2 mm in thickness was produced in the same manner as in Example 3. For the plate, one portion of the crosslinked acrylic resin particles of Example 3 was used instead of the crosslinked acrylic resin particles having a refractive index of 1.49, an average particle diameter of 0.85 μm, and a standard deviation of the particle diameter of 0.03 μm. The light diffusing plate had a Tt of 57.8%.
以與實施例3相同之方式製造厚度為2mm之光擴散板，但使用1份折射率為1.49、平均粒徑為0.72 μm且粒徑之標準差為0.07 μm的聚矽氧粒子代替實施例3之交聯丙烯酸系樹脂粒子。該光擴散板之Tt為51.1%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as in Example 3 except that 1 part of polyfluorene oxide particles having a refractive index of 1.49, an average particle diameter of 0.72 μm and a standard deviation of particle diameter of 0.07 μm was used instead of Example 3. Crosslinked acrylic resin particles. The light diffusing plate had a Tt of 51.1%.
以與上述相同方式製造厚度為2mm之光擴散板，但其中該聚矽氧粒子之數量改成1.5份或2.5份。其Tt分別為43.4%或38.9%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as above, except that the amount of the polyoxynene particles was changed to 1.5 parts or 2.5 parts. Its Tt is 43.4% or 38.9%, respectively.
以與實施例3相同之方式製造厚度為2mm之光擴散板，但使用1份折射率為1.49、平均粒徑為0.82 μm且粒徑之標準差為0.02 μm的交聯丙烯酸系樹脂粒子代替實施例3之交聯丙烯酸系樹脂粒子。該光擴散板之Tt為57.7%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as in Example 3, except that 1 part of crosslinked acrylic resin particles having a refractive index of 1.49, an average particle diameter of 0.82 μm, and a standard deviation of particle diameter of 0.02 μm were used instead. The crosslinked acrylic resin particle of Example 3. The light diffusing plate had a Tt of 57.7%.
以與上述相同方式製造厚度為2mm之光擴散板，但其中該交聯丙烯酸系樹脂粒子之數量改成1.5份或2.5份。其Tt分別為54.6%或51.1%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as above, except that the number of the crosslinked acrylic resin particles was changed to 1.5 parts or 2.5 parts. Its Tt is 54.6% or 51.1%, respectively.
以與實施例3相同之方式製造厚度為2mm之光擴散板，但使用1份折射率為1.49、平均粒徑為0.64 μm且粒徑之標準差為0.04 μm的交聯丙烯酸系樹脂粒子代替實施例3之交聯丙烯酸系樹脂粒子。該光擴散板之Tt為57.2%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as in Example 3, except that 1 part of crosslinked acrylic resin particles having a refractive index of 1.49, an average particle diameter of 0.64 μm, and a standard deviation of particle diameter of 0.04 μm were used instead. The crosslinked acrylic resin particle of Example 3. The light diffusing plate had a Tt of 57.2%.
以與上述相同方式製造厚度為2mm之光擴散板，但其中該交聯丙烯酸系樹脂粒子之數量改成1.5份或2.5份。其Tt分別為54.3%或50.4%。A light diffusing plate having a thickness of 2 mm was produced in the same manner as above, except that the number of the crosslinked acrylic resin particles was changed to 1.5 parts or 2.5 parts. Its Tt is 54.3% or 50.4%, respectively.
將0.04份之唑光學增亮劑(WHITE FLOWPSN conc，由SUMIKA COLOR CO.,LTD.所製)添加至83.96份苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080由Toyo Styrene Co.,Ltd.所製)、14.0份與實施例3中所使用者相同之交聯丙烯酸系樹脂粒子、1.0份之UV吸收劑(SUMISORB200，由Sumitomo Chemical Co.,Ltd.所製)加工安定劑(SUMIRIZERGP，由Sumitomo Chemical Co.,Ltd.所製)之混合物，並予以乾式摻合。然後使用雙螺桿擠出機在溫度範圍為190至250℃下將該混配料粒化，以製得呈小粒形式之光擴散體母體混合物A。0.04 parts Oxazole optical brightener (WHITE FLOW PSN conc, manufactured by SUMIKA COLOR CO., LTD.) was added to 83.96 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 (manufactured by Toyo Styrene Co., Ltd.), 14.0 parts of the same crosslinked acrylic resin particles as those of the user of Example 3, and 1.0 part of UV absorber (SUMISORB) 200, manufactured by Sumitomo Chemical Co., Ltd.) processing stabilizer (SUMIRIZER) A mixture of GP, manufactured by Sumitomo Chemical Co., Ltd., and dry blending. The compound was then granulated using a twin-screw extruder at a temperature ranging from 190 to 250 ° C to produce a light diffuser precursor mixture A in the form of pellets.
將90.55份之苯乙烯－甲基丙烯酸甲酯共聚物(EstyreneMS200NT，由Nippon Steel Chemical Co.,Ltd.所製；苯乙烯單元含量：80%；甲基丙烯酸甲酯單元含量：20%)、8.0份之交聯丙烯酸系樹脂粒子(折射率：1.49；平均粒徑：30 μm)、0.2份之加工安定劑(SUMIRIZERGP，由Sumitomo Chemical Co.,Ltd.所製)、1.0份之UV吸收劑(TINUVIN1577，由Ciba Specialty Chemicals Inc.所製)與0.25份之加工安定劑(MONOGLY D由NOF Corporation所製)加以乾式摻合。然後使用雙螺桿擠出機在溫度範圍為200至250℃下將該混合物粒化，以製得呈小粒形式之UV吸收混配料A。90.55 parts of styrene-methyl methacrylate copolymer (Estyrene) MS200NT, manufactured by Nippon Steel Chemical Co., Ltd.; styrene unit content: 80%; methyl methacrylate unit content: 20%), 8.0 parts of crosslinked acrylic resin particles (refractive index: 1.49; average Particle size: 30 μm), 0.2 parts of processing stabilizer (SUMIRIZER) GP, manufactured by Sumitomo Chemical Co., Ltd., 1.0 part of UV absorber (TINUVIN) 1577, manufactured by Ciba Specialty Chemicals Inc.), and 0.25 part of a processing stabilizer (MONOGLY D manufactured by NOF Corporation) were dry blended. The mixture was then granulated using a twin-screw extruder at a temperature ranging from 200 to 250 ° C to produce a UV absorbing compound A in the form of pellets.
將90份之苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080由Toyo Styrene Co.,Ltd.所製)與10份上述製備之光擴散體母體混合物A加以乾式摻合。然後，將該摻合物供應至螺桿直徑為120 mm之擠出機，並於200至250℃之溫度下熔融捏合之。另外將上述製備之UV吸收混配料A供應至螺桿直徑為45 mm之輔助擠出機，並於210至250℃之溫度下熔融捏合之。然後，在T模溫度為245至255℃下經由一進料塊與T模將該苯乙烯－甲基丙烯酸共聚物與光擴散體母體混配料A之摻合物的熔體以及UV吸收混配料A之熔體共擠出，製得三層光學擴散板，其包含厚度為1.86 mm之光擴散板，與層合在該擴 散板兩側表面上且厚度各為0.07 mm之UV吸收層。此多層光擴散板之Tt為53.4%。90 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 was prepared by Toyo Styrene Co., Ltd.) and dry blended with 10 parts of the light diffuser precursor mixture A prepared above. Then, the blend was supplied to an extruder having a screw diameter of 120 mm, and melt-kneaded at a temperature of 200 to 250 °C. Further, the UV-absorbing compound A prepared above was supplied to an auxiliary extruder having a screw diameter of 45 mm, and melt-kneaded at a temperature of 210 to 250 °C. Then, the melt of the blend of the styrene-methacrylic acid copolymer and the light diffusing body precursor A and the UV absorption compound are fed through a feed block and a T-die at a T-die temperature of 245 to 255 °C. The melt of A was co-extruded to obtain a three-layer optical diffusing plate comprising a light diffusing plate having a thickness of 1.86 mm and a UV absorbing layer laminated on both sides of the diffusing plate and having a thickness of 0.07 mm. The multilayer light diffusing plate had a Tt of 53.4%.
將97份之苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080由Toyo Styrene Co.,Ltd.所製)與3.0份於實施例8中製備之光擴散體母體混合物A加以乾式摻合。然後，將該摻合物供應至螺桿直徑為120 mm之擠出機，並於200至250℃之溫度下熔融捏合之。另外將實施例8中製備之UV吸收混配料A供應至螺桿直徑為45 mm之輔助擠出機，並於210至250℃之溫度下熔融捏合之。然後，在T模溫度為245至255℃下經由一進料塊與T模將該苯乙烯－甲基丙烯酸共聚物與光擴散體母體混合物A之摻合物的熔體以及UV吸收混配料A之熔體共擠出，製得三層光學擴散板，其包含厚度為1.86 mm之光擴散板，與層合在該擴散板兩側表面上且厚度各為0.07 mm之UV吸收層。此多層光擴散板之Tt為60.6%。97 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 was prepared by Toyo Styrene Co., Ltd.) and 3.0 parts of the light diffuser precursor mixture A prepared in Example 8 was dry blended. Then, the blend was supplied to an extruder having a screw diameter of 120 mm, and melt-kneaded at a temperature of 200 to 250 °C. Further, the UV absorbing compound A prepared in Example 8 was supplied to an auxiliary extruder having a screw diameter of 45 mm, and melt-kneaded at a temperature of 210 to 250 °C. Then, the melt of the blend of the styrene-methacrylic acid copolymer and the light diffuser precursor mixture A and the UV absorbing compound A are fed through a feed block and a T-die at a T-die temperature of 245 to 255 °C. The melt was co-extruded to obtain a three-layer optical diffusing plate comprising a light diffusing plate having a thickness of 1.86 mm and a UV absorbing layer laminated on both sides of the diffusing plate and having a thickness of 0.07 mm. The multilayer light diffusing plate had a Tt of 60.6%.
將90.55份之苯乙烯－甲基丙烯酸甲酯共聚物(EstyreneMS200NT，由Nippon Steel Chemical Co.,Ltd.所製；苯乙烯單元含量：80%；甲基丙烯酸甲酯單元含 量：20%)、8.0份之交聯丙烯酸系樹脂粒子(折射率；1.49；平均粒徑：30 μm)、0.2份之加工安定劑(SUMIRIZERGP，由Sumitomo Chemical Co.,Ltd.所製)、1.0份之UV吸收劑(LA 31，由ADEKA CORPORATION所製)與0.25份之加工安定劑(MONOGLY D由NOF Corporation所製)加以乾式摻合。然後，使用雙螺桿擠出機在溫度範圍為200至250℃下將該混合物粒化，以製得呈小粒形式之UV吸收混配料B。90.55 parts of styrene-methyl methacrylate copolymer (Estyrene) MS200NT, manufactured by Nippon Steel Chemical Co., Ltd.; styrene unit content: 80%; methyl methacrylate unit content: 20%), 8.0 parts of crosslinked acrylic resin particles (refractive index; 1.49; average Particle size: 30 μm), 0.2 parts of processing stabilizer (SUMIRIZER) GP, manufactured by Sumitomo Chemical Co., Ltd., 1.0 part of UV absorber (LA 31, manufactured by ADEKA CORPORATION) and 0.25 part of processing stabilizer (MONOGLY D manufactured by NOF Corporation) were dry blended. . Then, the mixture was granulated using a twin-screw extruder at a temperature ranging from 200 to 250 ° C to obtain a UV absorbing compound B in the form of pellets.
將96.8份之苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080由Toyo Styrene Co.,Ltd.所製)與3.2份於實施例8中製備之光擴散體母體混合物A加以乾式摻合。然後，將該摻合物供應至螺桿直徑為120 mm之擠出機，並於200至250℃之溫度下熔融捏合之。另外將上述製備之UV吸收混配料B供應至螺桿直徑為45 mm之輔助擠出機，並於210至250℃之溫度下熔融捏合之。然後，在T模溫度為245至255℃下經由一進料塊與T模將該苯乙烯－甲基丙烯酸共聚物與光擴散體母體混合物A之摻合物的熔體以及UV吸收混配料B之熔體共擠出，製得三層光學擴散板，其包含厚度為2.86 mm之光擴散板，與層合在該擴散板兩側表面上且厚度各為0.07 mm之UV吸收層。此總厚度為3mm之多層光擴散板的Tt為53.5%。96.8 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 was prepared by Toyo Styrene Co., Ltd.) and 3.2 parts of the light diffuser precursor mixture A prepared in Example 8 was dry blended. Then, the blend was supplied to an extruder having a screw diameter of 120 mm, and melt-kneaded at a temperature of 200 to 250 °C. Further, the UV-absorbing compound B prepared above was supplied to an auxiliary extruder having a screw diameter of 45 mm, and melt-kneaded at a temperature of 210 to 250 °C. Then, the melt of the blend of the styrene-methacrylic acid copolymer and the light diffuser precursor mixture A and the UV absorbing compound B are fed through a feed block and a T-die at a T-die temperature of 245 to 255 °C. The melt was co-extruded to obtain a three-layer optical diffusing plate comprising a light diffusing plate having a thickness of 2.86 mm and a UV absorbing layer laminated on both sides of the diffusing plate and having a thickness of 0.07 mm. The multilayer light diffusing plate having a total thickness of 3 mm had a Tt of 53.5%.
將88.0份之苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080由Toyo Styrene Co.,Ltd.所製)與12.0份於實施例8中製備之光擴散體母體混合物A加以乾式摻合。然後，將該摻合物供應至螺桿直徑為120 mm之擠出機，並於200至250℃之溫度下熔融捏合之。另外將實施例9中製備之UV吸收混配料B供應至螺桿直徑為45 mm之輔助擠出機，並於210至250℃之溫度下熔融捏合之。然後，在T模溫度為245至255℃下經由一進料塊與T模將該苯乙烯－甲基丙烯酸共聚物與光擴散體母體混合物A之摻合物的熔體以及UV吸收混配料B之熔體共擠出，製得三層光學擴散板，其包含厚度為1.61 mm之光擴散板，與層合在該擴散板兩側表面上且厚度各為0.07 mm之UV吸收層。此總厚度為1.75mm之多層光擴散板的Tt為52.4%。88.0 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 was prepared by Toyo Styrene Co., Ltd.) and dry blended with 12.0 parts of the light diffuser precursor mixture A prepared in Example 8. Then, the blend was supplied to an extruder having a screw diameter of 120 mm, and melt-kneaded at a temperature of 200 to 250 °C. Further, the UV absorbing compound B prepared in Example 9 was supplied to an auxiliary extruder having a screw diameter of 45 mm, and melt-kneaded at a temperature of 210 to 250 °C. Then, the melt of the blend of the styrene-methacrylic acid copolymer and the light diffuser precursor mixture A and the UV absorbing compound B are fed through a feed block and a T-die at a T-die temperature of 245 to 255 °C. The melt was co-extruded to obtain a three-layer optical diffusing plate comprising a light diffusing plate having a thickness of 1.61 mm and a UV absorbing layer laminated on both sides of the diffusing plate and having a thickness of 0.07 mm. The Tt of the multilayer light diffusing plate having a total thickness of 1.75 mm was 52.4%.
將0.05份唑光學增亮劑(WHITE FLOWPSN conc，由SUMIKA COLOR CO.,LTD.所製)添加至83.95份之苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080由Toyo Styrene Co.,Ltd.所製)、14.0份與實施例3中所 使用者相同之交聯丙烯酸系樹脂粒子、1.0份之UV吸收劑(SUMISORB200由Sumitomo Chemieal Co.,Ltd.所製)與1.0份之加工安定劑(SUMIRIZERGP，由Sumitomo Chemical Co.,Ltd所製)的混合物中，並加以乾式摻合。然後，使用雙螺桿擠出機在溫度範圍為190至250℃下將該混配料粒化，以製得呈小粒形式之光擴散體母體混合物B。Will be 0.05 parts Oxazole optical brightener (WHITE FLOW PSN conc, manufactured by SUMIKA COLOR CO., LTD.) was added to 83.95 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 (manufactured by Toyo Styrene Co., Ltd.), 14.0 parts of the same crosslinked acrylic resin particles as those of the user of Example 3, and 1.0 part of UV absorber (SUMISORB) 200 by Sumitomo Chemieal Co., Ltd.) and 1.0 part of processing stabilizer (SUMIRIZER) GP, a mixture of Sumitomo Chemical Co., Ltd.), and dry blending. Then, the compound was granulated using a twin-screw extruder at a temperature ranging from 190 to 250 ° C to obtain a light diffuser precursor mixture B in the form of pellets.
將90份之苯乙烯－甲基丙烯酸共聚物(TOYO STYROLT080由Toyo Styrene Co.,Ltd.所製)與10.0份上述製備之之光擴散體母體混合物B加以乾式摻合。然後，將該摻合物供應至螺桿直徑為120 mm之擠出機，並於200至250℃之溫度下熔融捏合之。另外將實施例10中製備之UV吸收混配料B供應至螺桿直徑為45 mm之輔助擠出機，並於210至250℃之溫度下熔融捏合之。然後，在T模溫度為245至255℃下經由一進料塊與T模將該苯乙烯－甲基丙烯酸共聚物與光擴散體母體混合物B之摻合物的熔體以及UV吸收混配料B之熔體共擠出，製得三層光學擴散板，其包含厚度為1.36 mm之光擴散板，與層合在該擴散板兩側表面上且厚度各為0.07 mm之UV吸收層。此總厚度為1.5 mm之多層光擴散板的Tt為58.6%。90 parts of styrene-methacrylic acid copolymer (TOYO STYROL) T080 was prepared by Toyo Styrene Co., Ltd.) and dry blended with 10.0 parts of the light diffuser precursor mixture B prepared above. Then, the blend was supplied to an extruder having a screw diameter of 120 mm, and melt-kneaded at a temperature of 200 to 250 °C. Further, the UV absorbing compound B prepared in Example 10 was supplied to an auxiliary extruder having a screw diameter of 45 mm, and melt-kneaded at a temperature of 210 to 250 °C. Then, the melt of the blend of the styrene-methacrylic acid copolymer and the light diffuser precursor mixture B and the UV absorbing compound B are passed through a feed block and a T-die at a T-die temperature of 245 to 255 °C. The melt was co-extruded to obtain a three-layer optical diffusing plate comprising a light diffusing plate having a thickness of 1.36 mm and a UV absorbing layer laminated on both sides of the diffusing plate and having a thickness of 0.07 mm. The Tt of the multilayer light diffusing plate having a total thickness of 1.5 mm was 58.6%.
實施例3－7與對照實例6之結果係彙總於表2。The results of Examples 3-7 and Comparative Example 6 are summarized in Table 2.
實施例8－12之結果係彙總於表3。The results of Examples 8-12 are summarized in Table 3.
1‧‧‧液晶單元1‧‧‧Liquid Crystal Unit
2‧‧‧偏光片2‧‧‧ polarizer
3‧‧‧濾色板3‧‧‧ color filter
4‧‧‧影像顯示器4‧‧‧Image display
5‧‧‧光源5‧‧‧Light source
6‧‧‧光擴散板6‧‧‧Light diffuser
圖1係一彩色液晶顯示器實例之示意橫剖面圖。Figure 1 is a schematic cross-sectional view showing an example of a color liquid crystal display.
1‧‧‧液晶單元1‧‧‧Liquid Crystal Unit
2‧‧‧偏光片2‧‧‧ polarizer
3‧‧‧濾色板3‧‧‧ color filter
4‧‧‧影像顯示器4‧‧‧Image display
5‧‧‧光源5‧‧‧Light source
6‧‧‧光擴散板6‧‧‧Light diffuser
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| JP2007213416A JP4910940B2 (en) | 2007-04-25 | 2007-08-20 | Light diffusion plate |
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| JP (2) | JP4910940B2 (en) |
| CN (1) | CN101295046A (en) |
| CZ (1) | CZ2008242A3 (en) |
| NL (1) | NL1035334C2 (en) |
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| JP2011079168A (en) * | 2009-10-05 | 2011-04-21 | Sumitomo Chemical Co Ltd | Method for producing resin plate |
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| TW455699B (en) * | 1999-03-31 | 2001-09-21 | Daicel Chem | Photo-scattering sheet, photo-scattering complex sheet and liquid crystal display member |
| TWI233935B (en) * | 2001-07-12 | 2005-06-11 | Sumitomo Chemical Co | Resin composition, molded article and laminate therefrom |
| TWI235866B (en) * | 2000-12-14 | 2005-07-11 | Mitsui Chemicals Inc | Reflector, sidelight type backlighting apparatus and reflector substrate |
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| US4165153A (en) * | 1978-04-25 | 1979-08-21 | Polaroid Corporation | Translucent screen |
| GB9314604D0 (en) * | 1993-07-14 | 1993-08-25 | Dow Deutschland Inc | Light diffuser composition |
| JP3515426B2 (en) * | 1999-05-28 | 2004-04-05 | 大日本印刷株式会社 | Anti-glare film and method for producing the same |
| JP2002293809A (en) * | 2001-03-30 | 2002-10-09 | Sekisui Plastics Co Ltd | Resin particulate, its production method and resin composition containing the same |
| KR20040048931A (en) * | 2001-10-04 | 2004-06-10 | 후지 샤신 필름 가부시기가이샤 | Liquid crystal display of transmission type |
| JP2004050607A (en) * | 2002-07-19 | 2004-02-19 | Sumitomo Chem Co Ltd | Light diffusible resin laminated sheet |
| JP2004170937A (en) * | 2002-11-06 | 2004-06-17 | Asahi Kasei Chemicals Corp | Laminated resin plate |
| JP2005181834A (en) * | 2003-12-22 | 2005-07-07 | Fuji Photo Film Co Ltd | Antireflection film, polarizing plate and picture display device |
| JP2005239837A (en) * | 2004-02-25 | 2005-09-08 | Toyo Ink Mfg Co Ltd | Light diffusion coating film-forming coating material and light diffusion sheet |
| JP4274164B2 (en) * | 2004-09-03 | 2009-06-03 | 住友化学株式会社 | Laminated resin plate |
| JP2006106185A (en) * | 2004-10-01 | 2006-04-20 | Kuraray Co Ltd | Light diffusion multilayer plate |
| JP4890766B2 (en) * | 2005-01-28 | 2012-03-07 | 帝人化成株式会社 | Light diffusing aromatic polycarbonate resin composition |
| US7297380B2 (en) * | 2005-05-20 | 2007-11-20 | General Electric Company | Light-diffusing films, backlight display devices comprising the light-diffusing films, and methods of making the same |
| WO2006137459A1 (en) * | 2005-06-24 | 2006-12-28 | Idemitsu Kosan Co., Ltd. | Light diffusing plate and lighting device using it |
| JP4910940B2 (en) * | 2007-04-25 | 2012-04-04 | 住友化学株式会社 | Light diffusion plate |
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2007
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- 2008-04-23 NL NL1035334A patent/NL1035334C2/en not_active IP Right Cessation
- 2008-04-24 CN CNA200810095714XA patent/CN101295046A/en active Pending
- 2008-04-25 PL PL385039A patent/PL385039A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW455699B (en) * | 1999-03-31 | 2001-09-21 | Daicel Chem | Photo-scattering sheet, photo-scattering complex sheet and liquid crystal display member |
| TWI235866B (en) * | 2000-12-14 | 2005-07-11 | Mitsui Chemicals Inc | Reflector, sidelight type backlighting apparatus and reflector substrate |
| TWI233935B (en) * | 2001-07-12 | 2005-06-11 | Sumitomo Chemical Co | Resin composition, molded article and laminate therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008292977A (en) | 2008-12-04 |
| JP5045481B2 (en) | 2012-10-10 |
| PL385039A1 (en) | 2008-10-27 |
| JP2008292969A (en) | 2008-12-04 |
| TW200912389A (en) | 2009-03-16 |
| CZ2008242A3 (en) | 2009-09-30 |
| CN101295046A (en) | 2008-10-29 |
| SK50402008A3 (en) | 2009-09-07 |
| JP4910940B2 (en) | 2012-04-04 |
| NL1035334C2 (en) | 2010-06-29 |
| NL1035334A1 (en) | 2008-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |