JP4821597B2 - Multi-layer light diffuser - Google Patents
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- JP4821597B2 JP4821597B2 JP2006347303A JP2006347303A JP4821597B2 JP 4821597 B2 JP4821597 B2 JP 4821597B2 JP 2006347303 A JP2006347303 A JP 2006347303A JP 2006347303 A JP2006347303 A JP 2006347303A JP 4821597 B2 JP4821597 B2 JP 4821597B2
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本発明は、多層光拡散板に関し、詳しくは直下型液晶ディスプレイ装置などを構成するバックライトに用いられる多層構成の光拡散板に関する。 The present invention relates to a multilayer light diffusing plate, and more particularly to a multilayered light diffusing plate used for a backlight constituting a direct liquid crystal display device or the like.
直下型液晶ディスプレイ装置(2)は、図２に示すように、液晶セル(3)と、その直下に配置されたバックライト装置(4)とを備えたディスプレイ装置であり、バックライト装置(4)としては、冷陰極線管(5)を光源とし、その前面側に光拡散板(1)を配置したものが広く用いられている。 As shown in FIG. 2, the direct type liquid crystal display device (2) is a display device including a liquid crystal cell (3) and a backlight device (4) arranged immediately below the liquid crystal cell (3). ) Is widely used in which a cold cathode ray tube (5) is used as a light source and a light diffusion plate (1) is disposed on the front side thereof.
冷陰極線管(5)としては、画面サイズの大型化に伴って、次第に大型のものが使用されるようになっており、これに伴い、冷陰極線管(5)から発生する紫外線も多くなって、光拡散板(1)が劣化して着色し易くなっている。 As the cold cathode ray tube (5), as the screen size increases, a larger one is gradually used, and as a result, more ultraviolet rays are generated from the cold cathode ray tube (5). The light diffusing plate (1) is deteriorated and easily colored.
かかる紫外線による劣化の少ない光拡散板(1)として、特許文献１〔特開２００５−２３４５２１号公報〕には、光拡散剤を含有する光拡散層(11)と、紫外線吸収剤を含有する紫外線吸収層(12)とが積層された多層光拡散板(10)が開示されている。 As a light diffusing plate (1) that is less deteriorated by ultraviolet rays, Patent Document 1 (Japanese Patent Laid-Open No. 2005-234521) discloses a light diffusing layer (11) containing a light diffusing agent and an ultraviolet ray containing an ultraviolet absorber. A multilayer light diffusion plate (10) in which an absorption layer (12) is laminated is disclosed.
しかし、光拡散板(1)としては、紫外線による劣化がより少ないものが望ましい。 However, it is desirable that the light diffusion plate (1) is less deteriorated by ultraviolet rays.
そこで本発明者は、紫外線による劣化がより少ない光拡散板(1)を開発するべく鋭意検討した結果、本発明に至った。 Therefore, the present inventors have intensively studied to develop a light diffusing plate (1) that is less deteriorated by ultraviolet rays, and as a result, have reached the present invention.
すなわち本発明は、スチレン系重合体およびスチレン系単量体−メタクリル酸メチル共重合体から選ばれる少なくとも一以上の透明樹脂に光拡散剤が分散されてなる光拡散層(11)と、
スチレン系単量体−メタクリル酸メチル共重合体１００質量部あたり式（１）
原子、ｔｅｒｔ−ブチル基、ｔｅｒｔ−オクチル基またはフェニル基を示す。〕
で示される紫外線吸収剤および式（２）
、式（２−２）
で示される置換基を示す。〕
で示される紫外線吸収剤から選ばれる少なくとも一以上の紫外線吸収剤０．０５質量部〜１０質量部を含む紫外線吸収層(12)と
が積層されてなることを特徴とする多層光拡散板(10)を提供するものである。
That is, the present invention comprises a light diffusion layer (11) in which a light diffusing agent is dispersed in at least one transparent resin selected from a styrene polymer and a styrene monomer-methyl methacrylate copolymer,
Formula (1) per 100 parts by mass of styrene monomer-methyl methacrylate copolymer
UV absorber and formula (2)
The substituent shown by these is shown. ]
A multilayer light diffusing plate (10) characterized by being laminated with an ultraviolet absorbing layer (12) containing 0.05 to 10 parts by mass of at least one ultraviolet absorber selected from the ultraviolet absorbers represented by ).
図１に本発明の多層光拡散板(10)の断面図を模式的に示す。図１(ａ)は、光拡散層(11)の片面に紫外線吸収層(12)が積層された例であり、図１(ｂ)は両面に紫外線吸収層(12)が積層された例である。 FIG. 1 schematically shows a cross-sectional view of the multilayer light diffusion plate (10) of the present invention. FIG. 1 (a) is an example in which an ultraviolet absorbing layer (12) is laminated on one side of a light diffusion layer (11), and FIG. 1 (b) is an example in which an ultraviolet absorbing layer (12) is laminated on both sides. is there.
本発明の多層光拡散板(10)は、紫外線による劣化が少ないので、図２に示すように、光源として冷陰極線管(5)を用いたバックライト(4)を構成する光拡散板(1)として有用である。 Since the multilayer light diffusing plate (10) of the present invention is hardly deteriorated by ultraviolet rays, as shown in FIG. 2, the light diffusing plate (1) constituting the backlight (4) using the cold cathode ray tube (5) as a light source is used. ) Is useful.
本発明の多層光拡散板(10)の光拡散層(11)を構成する透明樹脂は、スチレン系重合体およびスチレン系単量体−メタクリル酸メチル共重合体から選ばれる少なくとも一以上であり、これらは市販のものをそのまま使用することができる。中でも吸湿が少ない点で、ポリスチレンが好ましく用いられる。 The transparent resin constituting the light diffusion layer (11) of the multilayer light diffusion plate (10) of the present invention is at least one or more selected from a styrene polymer and a styrene monomer-methyl methacrylate copolymer, Commercially available products can be used as they are. Of these, polystyrene is preferably used because it absorbs less moisture.
スチレン系重合体とは、スチレン系単量体を単独で重合するか、または２種以上のスチレン系単量体を共重合して得られる重合体であって、スチレン系単量体としては、スチレンの他、置換スチレン類を用いることもできる。該置換スチレン類としては、例えばクロロスチレン、ブロモスチレンのようなハロゲン化スチレン類、ビニルトルエン、α−メチルスチレンのようなアルキルスチレン類などが挙げられる。スチレン系単量体は、それぞれ単独で用いられてもよいし、２種以上を組み合わせて用いられてもよい。 A styrenic polymer is a polymer obtained by polymerizing a styrenic monomer alone or by copolymerizing two or more styrenic monomers. In addition to styrene, substituted styrenes can also be used. Examples of the substituted styrenes include halogenated styrenes such as chlorostyrene and bromostyrene, and alkyl styrenes such as vinyltoluene and α-methylstyrene. A styrene-type monomer may be used independently, respectively, and may be used in combination of 2 or more type.
スチレン系単量体−メタクリル酸メチル共重合体とは、スチレン系重合体において上記し
たと同様のスチレン系単量体とメタクリル酸メチルとの共重合体であって、通常、スチレ
ン系単量体単位含有量２０質量％〜９５質量％、メタクリル酸メチル単位含有量８０質量
％〜５質量％、好ましくはスチレン系単量体単位含有量７０質量％以上、メタクリル酸メ
チル単位含有量３０質量％以下のものが用いられる。
The styrene monomer-methyl methacrylate copolymer is a copolymer of a styrene monomer and methyl methacrylate similar to those described above in the styrene polymer, and is usually a styrene monomer. Unit content 20 mass% to 95 mass%, methyl methacrylate unit content 80 mass% to 5 mass%, preferably styrene monomer unit content 70 mass% or more, methyl methacrylate unit content 30 mass% or less Is used.
光拡散剤とは、透明樹脂と屈折率が異なる粒子であって、透過する光を拡散しうるものであり、例えばガラスビーズ、シリカ粒子、水酸化アルミニウム粒子、炭酸カルシウム粒子、硫酸バリウム粒子、酸化チタン粒子、タルクなどの無機粒子であってもよいし、スチレン系重合体粒子、アクリル系重合体粒子、シロキサン系重合体粒子などの有機粒子であってもよい。 The light diffusing agent is a particle having a refractive index different from that of the transparent resin, and can diffuse the transmitted light. For example, glass beads, silica particles, aluminum hydroxide particles, calcium carbonate particles, barium sulfate particles, oxidation Inorganic particles such as titanium particles and talc may be used, and organic particles such as styrene polymer particles, acrylic polymer particles, and siloxane polymer particles may be used.
光拡散剤の粒子径は、体積平均粒子径で１μｍ以上、好ましくは２μｍ以上、さらに好ま
しくは３μｍ以上であり、光拡散剤に起因する細かな凹凸が表面に生じにくい点で、通常
２５μｍ以下、好ましくは２０μｍ以下、さらに好ましくは１０μｍ以下である。
The particle size of the light diffusing agent is 1 μm or more, preferably 2 μm or more, more preferably 3 μm or more in terms of volume average particle size, and is usually 25 μm or less in that fine irregularities caused by the light diffusing agent are unlikely to occur on the surface. Preferably it is 20 micrometers or less, More preferably, it is 10 micrometers or less.
光拡散層(11)における光拡散剤の含有量は、特に限定されないが、例えば透明樹脂１００
質量部あたり０．５質量部〜２０質量部である。
The content of the light diffusing agent in the light diffusing layer (11) is not particularly limited. For example, the transparent resin 100
It is 0.5 mass part-20 mass parts per mass part.
光拡散層(11)は、必要により光学特性を損なわない範囲で熱安定剤、酸化防止剤、耐候剤
、光安定剤、蛍光増白剤、グラスファイバーなどの補強剤などの添加剤を含有していても
よい。
The light diffusing layer (11) contains additives such as heat stabilizers, antioxidants, weathering agents, light stabilizers, optical brighteners, and reinforcing agents such as glass fiber as long as the optical properties are not impaired as necessary. It may be.
紫外線吸収層(12)に用いられるスチレン系単量体−メタクリル酸メチル共重合体は、光拡散層(11)に用いられるスチレン系重合体において上記したと同様のスチレン系単量体とメタクリル酸メチルとの共重合体であって、通常、スチレン系単量体単位含有量２０質量％〜９５質量％、メタクリル酸メチル単位含有量８０質量％〜５質量％、好ましくはスチレン系単量体単位含有量７０質量％以上、メタクリル酸メチル単位含有量３０質量％以下のものが用いられる。 The styrene monomer-methyl methacrylate copolymer used in the ultraviolet absorbing layer (12) is the same as the styrene monomer and methacrylic acid described above in the styrene polymer used in the light diffusion layer (11). A copolymer with methyl, usually containing 20% by mass to 95% by mass of a styrene monomer unit and 80% by mass to 5% by mass of a methyl methacrylate unit, preferably a styrene monomer unit. A material having a content of 70% by mass or more and a methyl methacrylate unit content of 30% by mass or less is used.
式（１）で示される紫外線吸収剤としては、例えば
４，６−ジフェニル−２−（４−ヘキシルオキシ−２−ヒドロキシフェニル）−ｓ−トリアジン、
４，６−ビス（ビフェニル−４−イル）−２−（４−ヘキシルオキシ−２−ヒドロキシフェニル）−ｓ−トリアジン、
４，６−ビス（４−ｔｅｒｔ−ブチルフェニル）−２−（４−ヘキシルオキシ−２−ヒドロキシフェニル）−ｓ−トリアジン、
４，６−ビス（４−ｔｅｒｔ−オクチルフェニル）−２−（４−ヘキシルオキシ−２−ヒドロキシフェニル）−ｓ−トリアジン、
４，６−ビス（ビフェニル−４−イル）−２−［（４−エチルヘキシルオキシ）−２−ヒドロキシフェニル］−ｓ−トリアジン、
４，６−ビス（４−ｔｅｒｔ−ブチルフェニル）−２−［（４−エチルヘキシルオキシ）−２−ヒドロキシフェニル］−ｓ−トリアジン、
４，６−ビス（４−ｔｅｒｔ−オクチルフェニル）−２−［（４−エチルヘキシルオキシ）−２−ヒドロキシフェニル］−ｓ−トリアジン
２−（４，６−ジフェニル−１，３，５−トリアジン−２−イル）−５−［（ヘキシル）オキシ］フェノール〔チバ・スペシャルティー・ケミカルズ社製「チヌビン１５７７ＦＦ」〕などが挙げられる。
Examples of the ultraviolet absorber represented by the formula (1) include 4,6-diphenyl-2- (4-hexyloxy-2-hydroxyphenyl) -s-triazine,
4,6-bis (biphenyl-4-yl) -2- (4-hexyloxy-2-hydroxyphenyl) -s-triazine,
4,6-bis (4-tert-butylphenyl) -2- (4-hexyloxy-2-hydroxyphenyl) -s-triazine,
4,6-bis (4-tert-octylphenyl) -2- (4-hexyloxy-2-hydroxyphenyl) -s-triazine,
4,6-bis (biphenyl-4-yl) -2-[(4-ethylhexyloxy) -2-hydroxyphenyl] -s-triazine,
4,6-bis (4-tert-butylphenyl) -2-[(4-ethylhexyloxy) -2-hydroxyphenyl] -s-triazine,
4,6-bis (4-tert-octylphenyl) -2-[(4-ethylhexyloxy) -2-hydroxyphenyl] -s-triazine 2- (4,6-diphenyl-1,3,5-triazine- 2-yl) -5-[(hexyl) oxy] phenol [“Tinuvin 1577FF” manufactured by Ciba Specialty Chemicals Co., Ltd.] and the like.
式（２）で示される紫外線吸収剤としては、例えば２−（２−ヒドロキシ−５−ｔｅｒｔ−オクチルフェニル）−２Ｈ−ベンゾトリアゾール、
２−（３，５−ビス−α−クミル−２−ヒドロキシフェニル）−２Ｈ−ベンゾトリアゾー
ル〔チバ・スペシャリティー・ケミカルズ社製「チヌビン２３４」〕、
２，２'−メチレン−ビス（４−ｔｅｒｔ−オクチル−（６−２Ｈ−ベンゾトリアゾール−２−イル）フェノール）〔旭電化社製「アデカスタブＬＡ−３１」〕、
２−（２−ヒドロキシ−３−α−クミル−５−ｔｅｒｔ−オクチルフェニル）−２Ｈ−ベンゾトリアゾール、
２−（２−ヒドロキシ−３−ｔｅｒｔ−オクチル−５−α−クミル−フェニル）−２Ｈ−ベンゾトリアゾール、
Ｎ−［３−（２Ｈ−ベンゾトリアゾリ−２−イル）−２−ヒドロキシ−５−メチルベンジル］−４，５，６，７−テトラヒドロフタルイミド〔共同薬品社製「バイオソーブ５９０」、シプロ化成社製「シーソーブ７０６」、住友化学社製「スミソーブ２５０」〕などが挙げられる。
Examples of the ultraviolet absorber represented by the formula (2) include 2- (2-hydroxy-5-tert-octylphenyl) -2H-benzotriazole,
2- (3,5-bis-α-cumyl-2-hydroxyphenyl) -2H-benzotriazole [“Tinuvin 234” manufactured by Ciba Specialty Chemicals],
2,2′-methylene-bis (4-tert-octyl- (6-2H-benzotriazol-2-yl) phenol) [Adeka Stub LA-31 manufactured by Asahi Denka Co., Ltd.]
2- (2-hydroxy-3-α-cumyl-5-tert-octylphenyl) -2H-benzotriazole,
2- (2-hydroxy-3-tert-octyl-5-α-cumyl-phenyl) -2H-benzotriazole,
N- [3- (2H-benzotriazoly-2-yl) -2-hydroxy-5-methylbenzyl] -4,5,6,7-tetrahydrophthalimide [“Biosorb 590” manufactured by Kyodo Yakuhin Co., Ltd. “ Seasorb 706 "," Sumisorb 250 "manufactured by Sumitomo Chemical Co., Ltd.) and the like.
式（１）で示される紫外線吸収剤および式（２）で示される紫外線吸収剤は、それぞれ単
独で用いてもよいし、２種以上を組み合わせて用いてもよい。
The ultraviolet absorber represented by formula (1) and the ultraviolet absorber represented by formula (2) may be used alone or in combination of two or more.
紫外線吸収層(12)における上記紫外線吸収剤の含有量はスチレン系単量体−メタクリル酸メチル共重合体１００質量部あたり、劣化を防止しうる点で０．０５質量部以上、好ましくは０．５質量部以上であり、紫外線吸収剤に起因する着色がない点で１０質量部以下、好ましくは３質量部以下、さらに好ましくは２質量部以下である。 The content of the ultraviolet absorber in the ultraviolet absorbing layer (12) is 0.05 parts by mass or more, preferably 0,0 in terms of preventing deterioration per 100 parts by mass of the styrene monomer-methyl methacrylate copolymer. It is 5 parts by mass or more, and is 10 parts by mass or less, preferably 3 parts by mass or less, and more preferably 2 parts by mass or less in that there is no coloration caused by the ultraviolet absorber.
紫外線吸収剤層(12)は、光拡散剤、加工安定剤などを含有していてもよい。光拡散剤とし
ては、光拡散層(11)において上記したと同様のものが挙げられる。
The ultraviolet absorber layer (12) may contain a light diffusing agent, a processing stabilizer and the like. Examples of the light diffusing agent include those described above for the light diffusing layer (11).
紫外線吸収層(12)の厚みは、紫外線による劣化をより防止できる点で通常１０μｍ以上、好ましくは３０μｍ以上であり、紫外線吸収剤による着色がない点で通常１００μｍ以下である。 The thickness of the ultraviolet absorbing layer (12) is usually 10 μm or more, preferably 30 μm or more from the viewpoint that deterioration due to ultraviolet rays can be further prevented, and is usually 100 μm or less from the viewpoint of no coloring by the ultraviolet absorber.
紫外線吸収層(12)は、図１(ａ)に示すように光拡散層(11)の片面に積層されていてもよい
し、図１(ｂ)に示すように光拡散層(11)の両面に積層されていてもよい。
The ultraviolet absorbing layer (12) may be laminated on one side of the light diffusion layer (11) as shown in FIG. 1 (a), or the light diffusion layer (11) as shown in FIG. 1 (b). It may be laminated on both sides.
本発明の光拡散板(10)の厚みは通常１ｍｍ〜３ｍｍである。 The thickness of the light diffusion plate (10) of the present invention is usually 1 mm to 3 mm.
本発明の光拡散板(10)は、例えば
(１)透明樹脂および光拡散剤を含む樹脂組成物と、スチレン系単量体−メタクリル酸メチ
ル共重合体および紫外線吸収剤を含む樹脂組成物を共押出しする方法、
(２)透明樹脂および光拡散剤を含む組成物を成形して板状成形体(11)とし、これに、スチ
レン系単量体−メタクリル酸メチル共重合体および紫外線吸収剤が溶剤に溶解された溶液
を塗布し、溶剤を揮発させて、紫外線吸収層(12)を形成する方法、
(３)透明樹脂および光拡散剤を含む組成物を成形して板状成形体(11)とし、これに、スチ
レン系単量体−メタクリル酸メチル共重合体および紫外線吸収剤を含む組成物をフィルム
状に成形したフィルム状成形体(12)を熱融着により貼合する方法
などが挙げられ、経済的に製造しうる点で、(１)共押出しによる方法が好ましい。
The light diffusion plate (10) of the present invention is, for example,
(1) A method of coextruding a resin composition containing a transparent resin and a light diffusing agent, and a resin composition containing a styrene monomer-methyl methacrylate copolymer and an ultraviolet absorber,
(2) A composition containing a transparent resin and a light diffusing agent is molded into a plate-like molded article (11), into which a styrene monomer-methyl methacrylate copolymer and an ultraviolet absorber are dissolved in a solvent. Coating the solution and evaporating the solvent to form the ultraviolet absorbing layer (12),
(3) A composition containing a transparent resin and a light diffusing agent is molded into a plate-like molded article (11), and a composition containing a styrene monomer-methyl methacrylate copolymer and an ultraviolet absorber is added thereto. Examples thereof include a method in which a film-like molded body (12) formed into a film is bonded by thermal fusion, and (1) a method by co-extrusion is preferred in that it can be produced economically.
本発明の多層光拡散板(10)は、紫外線による劣化が少ないので、例えば図２に示すような
バックライト装置(4)を構成する光拡散板(1)として有用である。このバックライト装置(4
)は、本発明の多層光拡散板(10)と、冷陰極線管(5)とを備えている。本発明の多層光拡散
板(10)は、その紫外線吸収層(12)が光拡散層(11)と冷陰極線管(5)との間に位置するように配置されており、例えば多層光拡散板(10)が光拡散層(11)の片面に紫外線吸収層(12)が積層されたものである場合には、この紫外線吸収層(12)が冷陰極線管(5)側になるように配置される。
Since the multilayer light diffusing plate (10) of the present invention is hardly deteriorated by ultraviolet rays, it is useful as a light diffusing plate (1) constituting a backlight device (4) as shown in FIG. 2, for example. This backlight device (4
) Includes the multilayer light diffusion plate (10) of the present invention and a cold cathode ray tube (5). The multilayer light diffusing plate (10) of the present invention is disposed such that the ultraviolet absorbing layer (12) is located between the light diffusing layer (11) and the cold cathode ray tube (5). When the plate (10) is a laminate of the light absorbing layer (11) and the ultraviolet absorbing layer (12) on one side, the ultraviolet absorbing layer (12) should be on the cold cathode ray tube (5) side. Be placed.
このバックライト装置(4)は、例えば図２に示すような直下型液晶ディスプレイ装置(2)に
好適に用いられる。この直下型液晶ディスプレイ装置(2)は、上記バックライト装置(4)と
液晶セル(3)とを備えている。液晶セル(3)はカラー画像を表示可能なものが好ましい。そ
して、この直下型液晶ディスプレイ装置(2)は、液晶セル(3)と冷陰極線管(5)との間に本
発明の多層光拡散板(10)が位置するように配置されており、長期間に亘り使用しても、冷
陰極線管(5)からの紫外線による光拡散板(1)の劣化が少なく、光拡散板(1)の着色による
画像表示の着色が少ない。
This backlight device (4) is suitably used for a direct liquid crystal display device (2) as shown in FIG. 2, for example. The direct liquid crystal display device (2) includes the backlight device (4) and a liquid crystal cell (3). The liquid crystal cell (3) is preferably capable of displaying a color image. The direct type liquid crystal display device (2) is arranged such that the multilayer light diffusing plate (10) of the present invention is positioned between the liquid crystal cell (3) and the cold cathode ray tube (5). Even when used over a period of time, there is little deterioration of the light diffusion plate (1) due to ultraviolet rays from the cold cathode ray tube (5), and there is little coloration of the image display due to coloring of the light diffusion plate (1).
以下、実施例によって本発明をより詳細に説明するが、本発明は、かかる実施例によって
限定されるものではない。
EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by this Example.
なお、各実施例における評価方法は以下のとおりである。
(１)光学特性評価（全光線透過率、拡散光透過率、ヘーズおよび分光透過率）
全光線透過率、拡散光透過率およびヘーズは、それぞれＪＩＳ Ｋ ７１３６に従い測定
した。
また、分光透過率は、積分球を備えた自記分光光度計〔日立製作所社製「ＵＶ−４０００
」〕を用いて３００ｎｍ〜８００ｎｍの分光透過率を測定し、黄色度ＹＩ、色度ｘおよび
色度ｙを求めた。
(２)水銀灯照射試験
水銀灯を備えたオーブン中に、得られた多層光拡散板(10)を入れ、７５℃で水銀灯により
紫外線を照射し５００時間照射後、および１０００時間照射後の分光透過率を測定し、黄
色度ＹＩ、色度ｘおよび色度ｙをそれぞれ求め、照射前との差（ΔＹＩ、Δｘ、Δｙ）を
求めた。水銀灯からの照射される光は、３６５ｎｍにける光線強度が０．３〜０．５ｍＷ
／ｃｍ2、４０５ｎｍにおける光線強度が０．９〜１．２Ｗ／ｃｍ2であった。
(３)輝度
得られた多層光拡散板(10)を１６３ｍｍ〔ＴＤ方向〕×４２３ｍｍ〔ＭＤ方向〕の長方形状に２枚、切り出し、クロロホルムにより４２３ｍｍ×３２６ｍｍのサイズに継ぎ足し、冷陰極線管(5)を備えた２０型直下型バックライト装置〔画面サイズは横４２３ｍｍ×縦３２６ｍｍ〕(4)に光拡散板(1)として装着し、冷陰極線管(5)を点灯した状態でマルチポイント輝度計により４４１点で輝度を測定し、その平均値を求めた。
In addition, the evaluation method in each Example is as follows.
(1) Optical property evaluation (total light transmittance, diffuse light transmittance, haze and spectral transmittance)
The total light transmittance, diffused light transmittance and haze were measured according to JIS K 7136, respectively.
Further, the spectral transmittance is measured by a self-recording spectrophotometer equipped with an integrating sphere [“UV-4000” manufactured by Hitachi, Ltd.
]] Was used to measure the spectral transmittance from 300 nm to 800 nm, and the yellowness YI, chromaticity x, and chromaticity y were determined.
(2) Mercury lamp irradiation test Put the obtained multilayer light diffusion plate (10) in an oven equipped with a mercury lamp, and irradiate ultraviolet rays with a mercury lamp at 75 ° C for 500 hours and after 1000 hours. , Yellowness YI, chromaticity x, and chromaticity y were determined, and differences (ΔYI, Δx, Δy) from before irradiation were determined. The light emitted from the mercury lamp has a light intensity at 365 nm of 0.3 to 0.5 mW.
/ Cm 2 , and the light intensity at 405 nm was 0.9 to 1.2 W / cm 2 .
(3) Luminance obtained multilayer light diffuser plate (10) was cut into two pieces of 163 mm [TD direction] × 423 mm [MD direction] rectangular shape, added to a size of 423 mm × 326 mm with chloroform, and cold cathode ray tube (5 ) With a 20-inch direct backlight device (screen size is 423 mm wide x 326 mm long) (4) mounted as a light diffusing plate (1), with the cold cathode ray tube (5) turned on, a multipoint luminance meter The luminance was measured at 441 points, and the average value was obtained.
実施例１
〔光拡散剤マスターバッチの製造〕
ポリスチレン〔東洋スチレン社製「トーヨースチロール ＨＲＭ４０」、ＭＦＲ（メルト
フローレート）０．９〜１．３ｇ／１０分〕４６質量部、架橋アクリル系樹脂粒子〔住友
化学社製「スミペックスＸＣ１Ａ」〕４０質量部、シリコーン樹脂粒子〔東レ・ダウコー
ニング社製「ＤＹ３３−７１９」〕４質量部、紫外線吸収剤〔クラリアント社製「ホスタ
ビン ＰＲ−２５」、ジメチル（ｐ−メトキシベンジリデン）マロネート〕８質量部、加
工安定剤〔ＡＰＩコーポレーション社製「ヨシノックス ＢＨＴ」、２，６−ジ−ｔｅｒ
ｔ−ブチル−４−メチルフェノール〕２質量部の混合物に、オキサゾール系蛍光漂白剤〔
住化カラー社製「ホワイトフローＰＳＮ ｃｏｎｃ」〕０．０３質量部を加え、ドライブ
レンドしたのち、８０℃〜２５０℃で６５ｍｍ２軸押出機によりペレット化して、ペレッ
ト状の光拡散剤マスターバッチを得た。
Example 1
[Production of light diffusing agent masterbatch]
46 parts by mass of polystyrene (“Toyostyrene HRM40” manufactured by Toyo Styrene Co., Ltd., MFR (melt flow rate) 0.9 to 1.3 g / 10 min), cross-linked acrylic resin particles [“SUMIPEX XC1A” manufactured by Sumitomo Chemical Co., Ltd.]] 40 mass Parts, 4 parts by mass of silicone resin particles [“DY33-719” manufactured by Toray Dow Corning Co., Ltd.], 8 parts by mass of UV absorber [“Hostabin PR-25” manufactured by Clariant Co., Ltd., dimethyl (p-methoxybenzylidene) malonate] Stabilizer [“YOSHINOX BHT” manufactured by API Corporation, 2,6-di-ter
t-butyl-4-methylphenol] is mixed with 2 parts by mass of an oxazole fluorescent bleaching agent [
“White Flow PSN conc” manufactured by Sumika Color Co., Ltd.] Add 0.03 parts by mass, dry blend, and pelletize at 80 to 250 ° C. with a 65 mm twin screw extruder to obtain a pellet-shaped light diffusing agent master batch It was.
〔紫外線吸収剤コンパウンドの製造〕
スチレンとメタクリル酸メチルとの共重合体〔新日鐵化学社製「エスチレンＭＳ２００Ｎ
Ｔ」、ＭＦＲ１．３〜１．９ｇ／１０分、スチレン単位８０質量％。メタクリル酸メチル
単位２０質量％〕１００質量部、架橋アクリル系樹脂粒子〔住友化学社製「スミペックス
ＸＣ１Ａ」〕２３質量部、加工安定剤〔住友化学社製「スミライザーＧＰ」〕０．２質量
部および紫外線吸収剤〔チバ・スペシャルティー・ケミカルズ社製「チヌビン１５７７Ｆ
Ｆ」、２−（４，６−ジフェニル−１，３，５−トリアジン−２−イル）−５−［（ヘキ
シル）オキシ］フェノール〕１．５質量部をドライブレンドした後、２００℃〜２３０℃
で２０ｍｍ単軸押出機によりペレット化して、ペレット状の紫外線吸収剤コンパウンドを
得た。
[Manufacture of UV absorber compound]
Copolymer of styrene and methyl methacrylate [“Estyrene MS200N” manufactured by Nippon Steel Chemical Co., Ltd.
T ", MFR 1.3 to 1.9 g / 10 min, styrene unit 80% by mass. 20 parts by mass of methyl methacrylate unit] 100 parts by mass, cross-linked acrylic resin particles [Sumitomo Chemical "Sumipex XC1A"] 23 parts by mass, processing stabilizer [Sumitomo Chemical "Sumilyzer GP"] 0.2 parts by mass and UV absorber [Chibinin 1577F manufactured by Ciba Specialty Chemicals
F ”, 1.5 parts by mass of 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] phenol] were dry blended, and then 200 ° C. to 230 ° C. ℃
And pelletized with a 20 mm single-screw extruder to obtain a pellet-like ultraviolet absorber compound.
〔多層光拡散板の製造〕
ポリスチレン〔トーヨースチロールＨＲＭ４０〕９２質量部および上記で得た光拡散剤マ
スターバッチ８質量部をドライブレンドした後、スクリュー径４０ｍｍの押出機に供給し
、２００〜２３５℃で、ベント部の圧力を５．３ｋＰａ（絶対圧）に保持した状態で溶融
し、一方、上記で得た紫外線吸収剤コンパウンドを、スクリュー径２０ｍｍの補助押出機
に供給し、押出機温度１９０〜２３０℃で、ベント部の圧力を２１．３ｋＰａ（絶対圧）
に保持した状態で溶融し、フィードブロックおよびＴダイを経由してＴダイ温度２４５〜
２５０℃で共押出して、紫外線吸収層〔０．０５ｍｍ〕(12)／光拡散層〔１．９ｍｍ〕(1
1)／紫外線吸収層〔０．０５ｍｍ〕(12)の３層構成で、幅約２２０ｍｍの多層光拡散板(1
0)を得た。
[Manufacture of multilayer light diffusing plates]
After dry blending 92 parts by mass of polystyrene [Toyostyrene HRM40] and 8 parts by mass of the light diffusing agent masterbatch obtained above, the mixture was supplied to an extruder with a screw diameter of 40 mm, and the pressure in the vent part was 5 to 200-235 ° C. Melting in a state where the pressure is maintained at 3 kPa (absolute pressure), while the ultraviolet absorbent compound obtained above is supplied to an auxiliary extruder having a screw diameter of 20 mm, the extruder temperature is 190 to 230 ° C., and the pressure in the vent section is 21.3kPa (absolute pressure)
And melted in a state of being held in the T die temperature 245 to 245 through the feed block and the T die.
Coextruded at 250 ° C., ultraviolet absorbing layer [0.05 mm] (12) / light diffusion layer [1.9 mm] (1
1) Multi-layer light diffusing plate (1) / UV absorbing layer [0.05mm] (12) with a width of about 220mm (1
0) was obtained.
〔評価〕
得られた多層光拡散板(10)を６５ｍｍ×６５ｍｍに切り出し、光学特性評価（全光線透過
率、拡散光透過率、ヘーズおよび分光透過率）を求め、初期光学特性としたのち、水銀灯
照射試験を行った。結果を第１表に示す。
また、得られた多層光拡散板(10)の輝度評価を行った。結果を第１表に示す。
[Evaluation]
The obtained multilayer light diffusing plate (10) was cut out to 65 mm × 65 mm, optical characteristics evaluation (total light transmittance, diffused light transmittance, haze and spectral transmittance) was determined and used as initial optical characteristics, and then a mercury lamp irradiation test Went. The results are shown in Table 1.
In addition, the brightness of the obtained multilayer light diffusing plate (10) was evaluated. The results are shown in Table 1.
実施例２
紫外線吸収剤〔チヌビン１５７７ＦＦ〕に代えて紫外線吸収剤〔旭電化社製「アデカスタ
ブＬＡ−３１」、２，２'−メチレン−ビス（４−ｔｅｒｔ−オクチル−（６−２Ｈ−ベンゾトリアゾール−２−イル）フェノール）〕１．６質量部を用いた以外は実施例１と同様に操作して多層光拡散板を得た。評価結果を第１表に示す。
Example 2
Instead of UV absorber [Tinuvin 1577FF], UV absorber [“Adeka Stub LA-31” manufactured by Asahi Denka Co., Ltd., 2,2′-methylene-bis (4-tert-octyl- (6-2H-benzotriazole-2- Yl) phenol)] A multilayer light diffusing plate was obtained in the same manner as in Example 1 except that 1.6 parts by mass were used. The evaluation results are shown in Table 1.
実施例３
紫外線吸収剤〔チヌビン１５７７ＦＦ〕に代えて紫外線吸収剤〔チバ・スペシャリティー
・ケミカルズ社製「チヌビン２３４」、２−（３，５−ビス−α−クミル−２−ヒドロキ
シフェニル）−２Ｈ−ベンゾトリアゾール〕２質量部を用いた以外は実施例１と同様に操
作して多層光拡散板を得た。評価結果を第１表に示す。
Example 3
Instead of UV absorber [Tinuvin 1577FF], UV absorber [Tinubin 234 manufactured by Ciba Specialty Chemicals, 2- (3,5-bis-α-cumyl-2-hydroxyphenyl) -2H-benzotriazole A multilayer light diffusing plate was obtained in the same manner as in Example 1 except that 2 parts by mass were used. The evaluation results are shown in Table 1.
実施例４
紫外線吸収剤〔チヌビン１５７７ＦＦ〕に代えて紫外線吸収剤〔共同薬品社製「バイオソ
ーブ５９０」、Ｎ−［３−（２Ｈ−ベンゾトリアゾール−２−イル）−２−ヒドロキシ−
５−メチルベンジル］−４，５，６，７−テトラヒドロフタルイミド〕１．８質量部を用
いた以外は実施例１と同様に操作して多層光拡散板を得た。評価結果を第１表に示す。
Example 4
Instead of UV absorber [Tinuvin 1577FF], UV absorber [Kyodo Pharmaceutical's “Biosorb 590”, N- [3- (2H-benzotriazol-2-yl) -2-hydroxy-
A multilayer light diffusing plate was obtained in the same manner as in Example 1 except that 1.8 parts by mass of [5-methylbenzyl] -4,5,6,7-tetrahydrophthalimide] was used. The evaluation results are shown in Table 1.
比較例１
紫外線吸収剤〔チヌビン１５７７ＦＦ〕に代えて紫外線吸収剤〔チバ・スペシャリティー
・ケミカルズ社製「チヌビンＰ」、２−（２Ｈ−ベンゾトリアゾール−２−イル）−ｐ−
クレゾール〕０．５質量部を用いた以外は実施例１と同様に操作して多層光拡散板を得た
。評価結果を第１表に示す。
Comparative Example 1
Instead of UV absorber [Tinuvin 1577FF], UV absorber [Cinubin P, manufactured by Ciba Specialty Chemicals, 2- (2H-benzotriazol-2-yl) -p-
Cresol] A multilayer light diffusing plate was obtained in the same manner as in Example 1 except that 0.5 part by mass was used. The evaluation results are shown in Table 1.
比較例２
紫外線吸収剤〔チヌビン１５７７ＦＦ〕に代えて紫外線吸収剤〔クラリアント社製「ホス
タビンＰＲ−２５」、ジメチル（ｐ−メトキシベンジリデン）マロネート〕１質量部を用
いた以外は実施例１と同様に操作して多層光拡散板を得た。評価結果を第１表に示す。
Comparative Example 2
The procedure was carried out in the same manner as in Example 1 except that 1 part by weight of the UV absorber ["Hostabin PR-25" manufactured by Clariant, dimethyl (p-methoxybenzylidene) malonate] was used instead of the UV absorber [Tinuvin 1577FF]. A multilayer light diffusion plate was obtained. The evaluation results are shown in Table 1.
比較例３
紫外線吸収剤〔チヌビン１５７７ＦＦ〕に代えて紫外線吸収剤〔サイテック・インダスト
リー社製「ＴＨＴ４６１１」、トリアジン系紫外線吸収剤１０質量％とヒンダードアミン系光安定剤９０質量％の混合物〕２質量部を用いた以外は実施例１と同様に操作して多層光拡散板を得た。評価結果を第１表に示す。
Comparative Example 3
Except for using 2 parts by weight of an ultraviolet absorber ("THT4611" manufactured by Cytec Industries Co., Ltd., a mixture of 10% by mass of a triazine-based ultraviolet absorber and 90% by mass of a hindered amine light stabilizer) instead of the ultraviolet absorber [Tinubin 1577FF]. Were operated in the same manner as in Example 1 to obtain a multilayer light diffusion plate. The evaluation results are shown in Table 1.
第 １ 表
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例 比較例
─────────────── ────────────
１ ２ ３ ４ １ ２ ３
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
厚さ (mm) 2.1 2.1 2.0 2.1 2.1 2.1 2.1
────────────────────────────────────────
初期光学特性
全光線透過率 (％) 57 57 56 58 56 56 57
拡散光線透過率(％) 57 56 56 57 56 56 56
ヘーズ 99 99 99 99 100 99 99
ＹＩ 3.1 2.3 2.0 3.6 3.1 1.6 3.1
色度ｘ 0.313 0.312 0.312 0.314 0.313 0.312 0.313
色度ｙ 0.318 0.318 0.317 0.319 0.318 0.317 0.318
────────────────────────────────────────
水銀灯照射試験
５００時間後
ΔＹＩ 0.2 0.7 0.0 -0.8 1.3 7.5 3.5
Δｘ 0.000 0.000 0.000 0.000 0.001 0.006 0.003
Δｙ 0.000 0.001 0.000 0.000 0.002 0.010 0.005
１０００時間後
ΔＹＩ 0.3 1.0 0.6 -0.1 2.5 8.7 4.2
Δｘ 0.000 0.001 0.000 0.000 0.002 0.007 0.003
Δｙ 0.001 0.001 0.001 0.000 0.004 0.012 0.006
────────────────────────────────────────
輝度評価 3500 3480 3420 3440 3430 3460 3500
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Table 1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Examples Comparative examples
─────────────── ─────────────
1 2 3 4 1 2 3
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Thickness (mm) 2.1 2.1 2.0 2.1 2.1 2.1 2.1
────────────────────────────────────────
Initial optical properties
Total light transmittance (%) 57 57 56 58 56 56 57
Diffuse light transmittance (%) 57 56 56 57 56 56 56
Haze 99 99 99 99 100 99 99
YI 3.1 2.3 2.0 3.6 3.1 1.6 3.1
Chromaticity x 0.313 0.312 0.312 0.314 0.313 0.312 0.313
Chromaticity y 0.318 0.318 0.317 0.319 0.318 0.317 0.318
────────────────────────────────────────
Mercury lamp irradiation test
After 500 hours
ΔYI 0.2 0.7 0.0 -0.8 1.3 7.5 3.5
Δx 0.000 0.000 0.000 0.000 0.001 0.006 0.003
Δy 0.000 0.001 0.000 0.000 0.002 0.010 0.005
1000 hours later
ΔYI 0.3 1.0 0.6 -0.1 2.5 8.7 4.2
Δx 0.000 0.001 0.000 0.000 0.002 0.007 0.003
Δy 0.001 0.001 0.001 0.000 0.004 0.012 0.006
────────────────────────────────────────
Luminance evaluation 3500 3480 3420 3440 3430 3460 3500
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
10：多層光拡散板
11：光拡散層 12：紫外線吸収層
２：直下型液晶ディスプレイ装置
１：光拡散板 ３：液晶セル ４：バックライト装置 ５：冷陰極線管
10: Multi-layer light diffuser
11: Light diffusing layer 12: UV absorbing layer 2: Direct liquid crystal display device 1: Light diffusing plate 3: Liquid crystal cell 4: Backlight device 5: Cold cathode ray tube
Claims (8)
スチレン系単量体−メタクリル酸メチル共重合体１００質量部あたり式（１）
で示される紫外線吸収剤および式（２）
で示される置換基を示す。〕
で示される紫外線吸収剤から選ばれる少なくとも一以上の紫外線吸収剤０．０５質量部〜１０質量部を含む紫外線吸収層と
が積層されてなることを特徴とする多層光拡散板。 A light diffusion layer in which a light diffusing agent is dispersed in at least one transparent resin selected from a styrene polymer and a styrene monomer-methyl methacrylate copolymer;
Formula (1) per 100 parts by mass of styrene monomer-methyl methacrylate copolymer
UV absorber and formula (2)
The substituent shown by these is shown. ]
A multilayer light diffusing plate comprising: an ultraviolet absorbing layer containing 0.05 to 10 parts by mass of at least one ultraviolet absorber selected from the ultraviolet absorbers represented by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006347303A JP4821597B2 (en) | 2006-01-06 | 2006-12-25 | Multi-layer light diffuser |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006001197 | 2006-01-06 | ||
| JP2006001197 | 2006-01-06 | ||
| JP2006057628 | 2006-03-03 | ||
| JP2006057628 | 2006-03-03 | ||
| JP2006347303A JP4821597B2 (en) | 2006-01-06 | 2006-12-25 | Multi-layer light diffuser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2007264598A JP2007264598A (en) | 2007-10-11 |
| JP4821597B2 true JP4821597B2 (en) | 2011-11-24 |
Family
ID=38637599
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006347303A Expired - Fee Related JP4821597B2 (en) | 2006-01-06 | 2006-12-25 | Multi-layer light diffuser |
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| Country | Link |
|---|---|
| JP (1) | JP4821597B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009179879A (en) | 2008-01-06 | 2009-08-13 | Dowa Electronics Materials Co Ltd | Silver micropowder having excellent affinity for polar medium, and silver ink |
| KR101618890B1 (en) * | 2008-03-12 | 2016-05-09 | 바스프 에스이 | An optical film for a flat panel display |
| JP2009230034A (en) * | 2008-03-25 | 2009-10-08 | Sumitomo Chemical Co Ltd | Deflection structure plate |
| JP5282500B2 (en) * | 2008-09-17 | 2013-09-04 | 凸版印刷株式会社 | Optical element and backlight unit and display device using the same |
| CN102257021B (en) | 2008-12-17 | 2013-07-17 | 电气化学工业株式会社 | Molded object for optical use, and lightguide plate and light diffuser both comprising same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5574166A (en) * | 1995-04-19 | 1996-11-12 | Ciba-Geigy Corporation | Crystalline form of 2-(2-hydroxy-3-α-cumyl-5-tert-octylphenyl)-2H-benzotriazole |
| JP3669743B2 (en) * | 1995-09-08 | 2005-07-13 | 電気化学工業株式会社 | Polymer concrete containing incineration ash and secondary product made of polymer concrete |
| JPH10293361A (en) * | 1997-04-18 | 1998-11-04 | Mitsubishi Rayon Co Ltd | Transmission type screen |
| JP4205359B2 (en) * | 2002-04-08 | 2009-01-07 | ダイセル化学工業株式会社 | Surface light source device and liquid crystal display device |
| JP2003140145A (en) * | 2001-10-31 | 2003-05-14 | Mitsubishi Chemicals Corp | Light control film, and surface light source device and liquid crystal display device using the same |
| JP2004102223A (en) * | 2002-07-15 | 2004-04-02 | Fuji Photo Film Co Ltd | Filter for organic electroluminescent display element |
| JP2005202097A (en) * | 2004-01-15 | 2005-07-28 | Sumitomo Chemical Co Ltd | Multilayered light diffusion board |
| JP2005234521A (en) * | 2004-01-20 | 2005-09-02 | Teijin Chem Ltd | Optical diffusion plate for direct backlight made of polycarbonate resin |
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2006
- 2006-12-25 JP JP2006347303A patent/JP4821597B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007264598A (en) | 2007-10-11 |
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