JP2000039506A - Light diffusion sheet - Google Patents
Light diffusion sheetInfo
- Publication number
- JP2000039506A JP2000039506A JP10205365A JP20536598A JP2000039506A JP 2000039506 A JP2000039506 A JP 2000039506A JP 10205365 A JP10205365 A JP 10205365A JP 20536598 A JP20536598 A JP 20536598A JP 2000039506 A JP2000039506 A JP 2000039506A
- Authority
- JP
- Japan
- Prior art keywords
- light diffusion
- fine particles
- light
- diffusion sheet
- particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は光拡散シートに関
し、特に液晶表示のバックライト用に適する光拡散シー
トに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffusion sheet, and more particularly to a light diffusion sheet suitable for a backlight of a liquid crystal display.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】液晶デ
ィスプレーにおいては、冷陰極管から発せられた光を導
光板により正面方向へ導く導光板方式が主流である。そ
して、光拡散シートは、光源から発せられた光を拡散さ
せ、光源の像を見えなくする効果がある。このような光
拡散シートとしては、炭酸カルシウム、シリカ粒子等の
無機微粒子を光拡散剤として、ポリメチルメタクリレー
ト樹脂、ポリカーボネート樹脂などに分散させたものな
どが提案されている。また、光拡散剤として有機重合体
微粒子を用いることも提案されている。例えば、ポリス
チレン微粒子を用いるもの（特開昭５６−３３６７７
号）や、シリコーン樹脂粒子を用いるもの（特開平１−
１７２８０号）が提案されている。2. Description of the Related Art In a liquid crystal display, a light guide plate system in which light emitted from a cold cathode tube is guided in a front direction by a light guide plate is mainly used. The light diffusion sheet has an effect of diffusing light emitted from the light source and making an image of the light source invisible. As such a light diffusing sheet, a sheet in which inorganic fine particles such as calcium carbonate and silica particles are dispersed as a light diffusing agent in a polymethyl methacrylate resin, a polycarbonate resin, or the like has been proposed. It has also been proposed to use organic polymer fine particles as a light diffusing agent. For example, those using polystyrene fine particles (Japanese Patent Application Laid-Open No. 56-33677)
) And those using silicone resin particles (Japanese Unexamined Patent Publication No.
No. 17280) has been proposed.
【０００３】また、表示画面の正面方向において十分な
輝度を得るために、バインダー樹脂に重合体粒子よりも
屈折率の高い酸化ジルコニウム等の粒子を含有させる方
法（特開平６−５９１０７号）が提案されている。しか
し、この方法では、酸化ジルコニウム等の高比重の粒子
を用いた場合には混合物の中で粒子が沈降しやすいた
め、超微粒子を用いることが必要となる。しかし、超微
粒子は一般に凝集しやすく、これを分散させるのが難し
いという問題があった。Further, in order to obtain a sufficient luminance in the front direction of the display screen, a method has been proposed in which a binder resin contains particles such as zirconium oxide having a higher refractive index than polymer particles (Japanese Patent Laid-Open No. 6-59107). Have been. However, in this method, when particles having a high specific gravity, such as zirconium oxide, are used, the particles tend to settle in the mixture, so that it is necessary to use ultrafine particles. However, there has been a problem that ultrafine particles are generally easily aggregated and difficult to disperse.
【０００４】このように、導光板方式では光拡散シート
に均一で高拡散特性が求められており、これまでの光拡
散シートでは光は均一に拡散されるが、正面方向の透過
光量が低下し、ディスプレーの輝度が低下するという問
題があった。近年、液晶ディスプレーの高輝度化および
薄型化が強く求められており、従来の光拡散シートは光
拡散性は良好であるが、高輝度化という点では満足でき
るものではなかった。As described above, in the light guide plate system, the light diffusion sheet is required to have uniform and high diffusion characteristics. In the conventional light diffusion sheet, light is uniformly diffused, but the amount of transmitted light in the front direction is reduced. However, there is a problem that the brightness of the display is reduced. In recent years, there has been a strong demand for higher luminance and thinner liquid crystal displays. Conventional light diffusing sheets have good light diffusing properties, but have not been satisfactory in terms of increasing luminance.
【０００５】この発明の目的は、正面方向の光透過性に
優れ（集光性）、なおかつ十分なヘイズを有する光拡散
シートを提供することにある。An object of the present invention is to provide a light diffusion sheet having excellent light transmittance in the front direction (light collecting property) and having a sufficient haze.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記の目的
を達成するために鋭意研究を行った結果、偏平状の重合
体微粒子を光拡散剤として、バインダー樹脂を介して透
明基材にコーティングした場合に、上記の課題を解決で
きることを見出して、この発明を完成するに到った。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, flat polymer fine particles have been used as a light diffusing agent on a transparent substrate via a binder resin. The present inventors have found that the above problems can be solved by coating, and have completed the present invention.
【０００７】すなわち、この発明は、透明基材の少なく
とも片面にバインダー樹脂および重合体微粒子からなる
光拡散層を有する光拡散シートにおいて、重合体微粒子
がビニル系重合体からなる偏平状異形微粒子であること
を特徴とする光拡散シートを提供する。That is, the present invention relates to a light diffusion sheet having a light diffusion layer comprising a binder resin and polymer fine particles on at least one surface of a transparent substrate, wherein the polymer fine particles are flat irregularly shaped fine particles comprising a vinyl polymer. A light diffusion sheet is provided.
【０００８】[0008]
【発明の実施の形態】この発明で用いられる光拡散剤と
しての重合体微粒子は、ビニル系重合体からなる偏平状
異形微粒子であって、その平面形状が略円形で、表面が
凸状、裏面（底部）が凹状となった異形微粒子である。
このような偏平状異形微粒子としては、底部の直径
（Ｄ）が０．３〜５μｍであり、（Ｄ）と厚み（ｄ）の
比（Ｄ／ｄ）が１．５〜５であるものが知られている
（特公平２−１４２２２号）。また、三井化学（株）製
のミューティクル、松本油脂製薬（株）製のマイクロス
フェアー Ｍ−３１１なども使用できる。BEST MODE FOR CARRYING OUT THE INVENTION Polymer fine particles as a light diffusing agent used in the present invention are flat irregularly shaped fine particles made of a vinyl polymer and have a substantially circular planar shape, a convex surface, and a rear surface. (Bottom) are irregularly shaped fine particles having a concave shape.
As such flat shaped fine particles, those having a bottom diameter (D) of 0.3 to 5 μm and a ratio (D / d) of (D) to thickness (d) of 1.5 to 5 are used. It is known (Japanese Patent Publication No. 2-14222). Further, Muticle manufactured by Mitsui Chemicals, Inc., Microsphere M-311 manufactured by Matsumoto Yushi-Seiyaku Co., Ltd., and the like can also be used.
【０００９】さらに、例えばスチレン、ビニルトルエン
などの芳香族ビニル単量体、メタクリル酸メチル、メタ
クリル酸ブチルなどのメタクリル酸エステル類などのビ
ニル単量体の１種または２種以上を組み合せて重合して
得られるものも使用できる。これらの重合体微粒子の製
造に際して架橋性単量体を使用すれば、耐溶剤性を付与
することができる。架橋性単量体を用いる場合、その使
用割合は好ましくは１〜３０％、さらに好ましくは３〜
２０％である。Furthermore, one or more aromatic vinyl monomers such as styrene and vinyl toluene, and vinyl monomers such as methacrylates such as methyl methacrylate and butyl methacrylate are polymerized in combination. Those obtained by using can also be used. When a crosslinkable monomer is used in the production of these polymer fine particles, solvent resistance can be imparted. When a crosslinkable monomer is used, its use ratio is preferably 1 to 30%, more preferably 3 to 30%.
20%.
【００１０】この発明の重合体微粒子の大きさは特に限
定されず、光拡散シートの要求特性に応じて適宜選定さ
れるが、通常０．５〜２０μｍ程度が好ましく、さらに
好ましくは０．８〜１０μｍ程度である。これらの重合
体微粒子は、バインダー樹脂と共に、透明基材にコーテ
ィングされる。[0010] The size of the polymer fine particles of the present invention is not particularly limited and is appropriately selected according to the required characteristics of the light diffusing sheet. It is about 10 μm. These polymer fine particles are coated on a transparent substrate together with a binder resin.
【００１１】バインダー樹脂としては、通常この分野で
使用されるものであれば特に限定されないが、例えばポ
リエステル系樹脂、アクリル系樹脂、ポリスチレン系樹
脂、ポリ塩化ビニル系樹脂、ポリウレタン系樹脂、ポリ
ビニルアルコール系樹脂、ポリ酢酸ビニル系樹脂などが
挙げられる。バインダー樹脂は、適当な有機溶剤にあら
かじめ溶解させたもの、あるいは有機溶剤や水に分散さ
せたものを用いてもよい。例えば、ポリエステル系のバ
インダー樹脂としては、東洋紡社製バイロン２００（商
品名）が使用できるが、バイロン２００をあらかじめト
ルエンおよびメチルエチルケトンの混合溶剤に樹脂固形
分で３０重量％に溶解した東洋紡社製バイロン２０ＳＳ
（商品名 樹脂固形分３０重量％）を使用してもよく、
ポリエステル系樹脂を水および有機溶剤の混合溶剤に固
形分で３４重量％になるように分散した東洋紡社製 バ
イロナールＭＤ１２００（商品名 固形分 ３４％）な
どを用いてもよい。The binder resin is not particularly limited as long as it is generally used in this field. For example, polyester resins, acrylic resins, polystyrene resins, polyvinyl chloride resins, polyurethane resins, polyvinyl alcohol resins Resins, polyvinyl acetate resins and the like. As the binder resin, one dissolved in a suitable organic solvent in advance, or one dispersed in an organic solvent or water may be used. For example, as a polyester-based binder resin, Toyobo Co., Ltd. Byron 200 (trade name) can be used, and Toyobo Co., Ltd. Byron 20SS prepared by previously dissolving Byron 200 in a mixed solvent of toluene and methyl ethyl ketone at a resin solid content of 30% by weight.
(Trade name resin solid content 30% by weight)
Vylonal MD1200 (trade name: 34% solid content, manufactured by Toyobo Co., Ltd.) in which a polyester resin is dispersed in a mixed solvent of water and an organic solvent so as to have a solid content of 34% by weight may be used.
【００１２】また、透明基材としては、ポリメチルメタ
クリレート、ポリカーボネート、ポリ塩化ビニル、ポリ
エステル、アセテート樹脂などのフィルム状、シート状
のものが好ましく、耐光性および加工性の面からポリエ
ステルのフィルム状のものが特に好ましい。透明基材上
への光拡散層のコーティングは、バインダー樹脂を溶媒
に溶解し、これに重合体微粒子を分散させて基材上にコ
ーティングすることにより行われる。バインダー樹脂と
重合体微粒子との割合は、光拡散シートの用途、コーテ
ィング層の厚さなどにもよるが、通常バインダー樹脂１
００重量部に対して重合体微粒子３０〜３００重量部が
好ましい。コーティングの方法としては、スプレー法、
ディッピング法、ロールコーター法、ナイフコート法、
カーテンフロー法などの公知の方法を採用できる。コー
ティング層の厚さは、通常５〜３０μｍほどで十分であ
る。The transparent substrate is preferably in the form of a film or sheet, such as polymethyl methacrylate, polycarbonate, polyvinyl chloride, polyester, or an acetate resin. From the viewpoint of light resistance and workability, a polyester film is preferred. Are particularly preferred. The coating of the light diffusion layer on the transparent substrate is performed by dissolving a binder resin in a solvent, dispersing polymer fine particles in the solvent, and coating the dispersion on the substrate. The ratio of the binder resin to the polymer fine particles depends on the use of the light diffusion sheet, the thickness of the coating layer, and the like.
30 to 300 parts by weight of the polymer fine particles are preferably based on 00 parts by weight. Spray method,
Dipping method, roll coater method, knife coat method,
A known method such as a curtain flow method can be employed. The thickness of the coating layer is usually about 5 to 30 μm.
【００１３】なお、光拡散層のコーティングは、透明基
材の両面に施してもよい。この発明の光拡散シートは、
光拡散層中に偏平状異形微粒子を含有することにより、
正面方向への出射光を増加させ、なおかつバランスのと
れた光拡散特性を有する。The light diffusion layer may be coated on both sides of the transparent substrate. The light diffusion sheet of the present invention
By containing flat irregular shaped fine particles in the light diffusion layer,
It increases the light emitted in the front direction and has a well-balanced light diffusion characteristic.
【００１４】[0014]
【実施例】合成例１ 攪拌機、温度計、還流コンデンサー付きのセパラブルフ
ラスコに、水６００ｇ、メタアクリル酸メチル１００ｇ
および連鎖移動剤としてのｎ−オクチルメルカプタン
（ｎ−ＯＭ）０．５ｇを仕込み、攪拌下に窒素置換しな
がら７０℃まで加温する。内温を７０℃に保ち、重合開
始剤として過硫酸カリウム０．５ｇを添加した後、８時
間重合反応させる。得られたエマルジョンは、粒径０．
４μｍ、重量平均分子量４５，０００の真球状粒子から
なる固形分１４％を含有していた。EXAMPLES Synthesis Example 1 In a separable flask equipped with a stirrer, thermometer and reflux condenser, 600 g of water and 100 g of methyl methacrylate were placed.
Then, 0.5 g of n-octyl mercaptan (n-OM) as a chain transfer agent is charged and heated to 70 ° C. while stirring and replacing with nitrogen. After maintaining the internal temperature at 70 ° C. and adding 0.5 g of potassium persulfate as a polymerization initiator, the polymerization reaction is carried out for 8 hours. The resulting emulsion has a particle size of 0.1.
It had a solid content of 14% consisting of 4 μm, spherical particles having a weight average molecular weight of 45,000.
【００１５】上記で得られたエマルジョン７１．５ｇ
（種粒子として固形分換算１０ｇ）に、ラウリル硫酸ナ
トリウム０．１５ｇ、イオン交換水５００ｇ、メタクリ
ル酸メチル９５ｇおよびエチレングリコールジメタクリ
レート５ｇを混合し、３０℃で２時間攪拌して、種粒子
に単量体を吸収させた。次いで、この混合物を窒素気流
下で７０℃に加温し、重合開始剤として過硫酸カリウム
０．５ｇを溶解したイオン交換水５０ｇを添加し、５時
間重合反応を行ったところ、重合安定性のよい重合体微
粒子が得られた。得られた重合体微粒子を走査型電子顕
微鏡により観察したところ、この微粒子は、平面の直径
１．２μｍ，厚さ０．６μｍで、粒子の裏面中央に直径
０．５μｍの凹部をもつ偏平状異形微粒子であった。こ
の微粒子の電子顕微鏡写真を図１に示す。71.5 g of the emulsion obtained above
0.15 g of sodium lauryl sulfate, 500 g of ion-exchanged water, 95 g of methyl methacrylate, and 5 g of ethylene glycol dimethacrylate were mixed with (seed particles at a solid content of 10 g), and the mixture was stirred at 30 ° C. for 2 hours. The monomer was absorbed. Next, the mixture was heated to 70 ° C. under a nitrogen stream, 50 g of ion-exchanged water in which 0.5 g of potassium persulfate was dissolved as a polymerization initiator was added, and the polymerization reaction was performed for 5 hours. Good polymer fine particles were obtained. Observation of the obtained polymer fine particles with a scanning electron microscope revealed that the fine particles had a flat diameter of 1.2 μm and a thickness of 0.6 μm, and had a flat irregular shape having a concave portion of 0.5 μm in the center of the back surface of the particles. It was fine particles. FIG. 1 shows an electron micrograph of the fine particles.
【００１６】実施例１ ポリエステルフィルム〔ルミラーＴ−６０ 東レ（株）
製 厚み１００μｍ〕の片面に下記の組成物を、ギャッ
プ高さ７５μｍのアプリケーターを用いてコーティング
した。コーティング後、乾燥炉にて熱風乾燥を行い、光
拡散シートを得た。 バインダー樹脂：ポリエステル樹脂〔東洋紡（株）製 バイロナールＭＤ１２ ００ バインダー樹脂分３４％〕 ……１００重量部 重合体微粒子：合成例１で得られた平均粒子径１．２μｍの偏平状異形微粒子 …… ３４重量部Example 1 Polyester film [Lumilar T-60 Toray Industries, Inc.
(Thickness: 100 μm) was coated on one surface with an applicator having a gap height of 75 μm. After coating, hot air drying was performed in a drying oven to obtain a light diffusion sheet. Binder resin: Polyester resin (manufactured by Toyobo Co., Ltd., Vironal MD12000, binder resin content: 34%) 100 parts by weight Polymer fine particles: Flat irregular fine particles having an average particle diameter of 1.2 μm obtained in Synthesis Example 1 34 Parts by weight
【００１７】実施例２ ポリエステルフィルム〔ルミラーＴ−６０ 厚み１００
μｍ〕の片面に下記の組成物を、ギャップ高さ７５μｍ
のアプリケーターを用いてコーティングした。コーティ
ング後、乾燥炉にて熱風乾燥を行い、光拡散シートを得
た。 バインダー樹脂：ポリエステル樹脂〔東洋紡（株）製 バイロナールＭＤ１２ ００ バインダー樹脂分３４％〕 ……１００重量部 重合体微粒子：合成例１で得られた平均粒子径１．２μｍの偏平状重合体粒子 …… １２重量部Example 2 Polyester film [Lumilar T-60 thickness 100
μm] on one side of the following composition, gap height 75 μm
Using an applicator. After coating, hot air drying was performed in a drying oven to obtain a light diffusion sheet. Binder resin: polyester resin (manufactured by Toyobo Co., Ltd., Bayronal MD12000 binder resin content: 34%) 100 parts by weight Polymer fine particles: flat polymer particles having an average particle diameter of 1.2 µm obtained in Synthesis Example 1 ... 12 parts by weight
【００１８】実施例３ ポリエステルフィルム〔ルミラーＴ−６０ 厚み１００
μｍ〕の片面に下記の組成物を、ギャップ高さ７５μｍ
のアプリケーターを用いてコーティングした。コーティ
ング後、乾燥炉にて熱風乾燥を行い、光拡散シートを得
た。 バインダー樹脂：ポリエステル樹脂〔東洋紡（株）製 バイロナールＭＤ１２ ００ バインダー樹脂分３４％〕 ……１００重量部 重合体微粒子：合成例１で得られた平均粒子径１．２μｍの偏平状異形微粒子 …… ８５重量部 溶剤：メチルエチルケトン …… ７５重量部Example 3 Polyester film [Lumilar T-60 thickness 100
μm] on one side of the following composition, gap height 75 μm
Using an applicator. After coating, hot air drying was performed in a drying oven to obtain a light diffusion sheet. Binder resin: Polyester resin [Vylonal MD1200 manufactured by Toyobo Co., Ltd. Binder resin content: 34%] 100 parts by weight Polymer fine particles: Flat irregular fine particles having an average particle diameter of 1.2 µm obtained in Synthesis Example 1 85 Parts by weight Solvent: methyl ethyl ketone 75 parts by weight
【００１９】比較例１ 重合体微粒子としてトスパール１２０〔平均粒子径２μ
ｍ 有機シリコーン微粒子 東芝シリコーン（株）製〕
を３４重量部用いた以外は、実施例１と同様の操作を行
って光拡散シートを得た。Comparative Example 1 Tospearl 120 [average particle diameter 2 μm] as polymer fine particles
m Organic silicone fine particles manufactured by Toshiba Silicone Co., Ltd.]
Was used in the same manner as in Example 1 except that 34 parts by weight was used to obtain a light diffusion sheet.
【００２０】比較例２ 重合体微粒子としてＭＢＸ−２〔平均粒子径２μｍ ポ
リメチルメタクリレート粒子 積水化成品（株）製〕を
３４重量部用いた以外は、実施例１と同様の操作を行っ
て光拡散シートを得た。Comparative Example 2 The same operation as in Example 1 was performed except that 34 parts by weight of MBX-2 (average particle size: 2 μm, polymethyl methacrylate particles, manufactured by Sekisui Plastics Co., Ltd.) was used as the polymer fine particles. A diffusion sheet was obtained.
【００２１】比較例３ ポリエステルフィルム〔ルミラーＴ−６０ 厚み１００
μｍ〕の片面に下記の組成物を、ギャップ高さ７５μｍ
のアプリケーターを用いてコーティングした。コーティ
ング後、乾燥炉にて熱風乾燥を行い、光拡散シートを得
た。 バインダー樹脂：ポリエステル樹脂〔東洋紡（株）製 バイロン２００〕 …… ５０重量部 重合体微粒子：架橋ポリスチレン〔平均粒子径１２μｍ ＳＢＸ−１２ 積水 化成品（株）製〕 …… ５０重量部 溶剤：トルエン …… ７５重量部 メチルエチルケトン …… ７５重量部 各実施例および比較例で得られた光拡散シートの光学特
性の評価を行った。評価は以下の方法で行った。Comparative Example 3 Polyester film [Lumilar T-60 thickness 100
μm] on one side of the following composition, gap height 75 μm
Using an applicator. After coating, hot air drying was performed in a drying oven to obtain a light diffusion sheet. Binder resin: polyester resin [Byron 200, manufactured by Toyobo Co., Ltd.] 50 parts by weight Polymer fine particles: crosslinked polystyrene [average particle size: 12 μm SBX-12 Sekisui Chemical Co., Ltd.] 50 parts by weight Solvent: toluene ... 75 parts by weight Methyl ethyl ketone ... 75 parts by weight The optical characteristics of the light diffusion sheet obtained in each of Examples and Comparative Examples were evaluated. The evaluation was performed by the following method.
【００２２】〔光線透過率およびヘイズの測定〕ヘイズ
メーター〔日本電色（株）製 ＮＤＨ−２０００〕によ
って、全光線透過率およびヘイズを測定した。全光線透
過率８０％以上、ヘイズ７０％以上のものを良品と判定
した。[Measurement of Light Transmittance and Haze] The total light transmittance and haze were measured by a haze meter [NDH-2000 manufactured by Nippon Denshoku Co., Ltd.]. Those having a total light transmittance of 80% or more and a haze of 70% or more were judged to be good.
【００２３】〔透過光度角度特性の測定〕自動変角式光
度計〔村上色彩技術研究所（株）製 ＧＰ−２００〕に
よって、透過光度の角度特性を測定した。結果を表１お
よび図２−７に示す。集光性の測定は、正面方向の透過
光度を１００とし、透過光度が３３になるときの角度γ
を測定した。図２〜７から明らかなように、各実施例の
光拡散シートを用いた場合、正面（角度０度）付近の透
過光度は、各比較例の光拡散シートに比べて極めて大き
く、従来の集光性タイプの光拡散性シートよりも極めて
高い集光性を示した。また、各実施例の光拡散シートは
十分なヘイズを有しており、導光板上のパターンは拡散
されて視認されない。[Measurement of transmitted light angle characteristics] The angle characteristics of transmitted light were measured by an automatic goniophotometer (GP-200, manufactured by Murakami Color Research Laboratory Co., Ltd.). The results are shown in Table 1 and FIGS. The light collecting property is measured by setting the transmitted light intensity in the front direction to 100 and the angle γ when the transmitted light intensity becomes 33.
Was measured. As is clear from FIGS. 2 to 7, when the light diffusion sheet of each embodiment is used, the transmitted light intensity near the front (at an angle of 0 degree) is extremely large as compared with the light diffusion sheet of each comparative example. The light-collecting property was extremely higher than that of the light-type light-diffusing sheet. Further, the light diffusion sheet of each example has a sufficient haze, and the pattern on the light guide plate is diffused and is not visually recognized.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【発明の効果】この発明の光拡散シートは、光拡散層中
に偏平状異形微粒子を含有することにより、従来の光拡
散シートに比べ、正面方向の出射光量を極めて大きくす
ることができ、集光性に優れている。そのため、これを
液晶ディスプレーに用いた場合、その輝度を飛躍的に向
上させることができる。According to the light diffusion sheet of the present invention, since the light diffusion layer contains the flat irregularly shaped fine particles, the amount of light emitted in the front direction can be extremely increased as compared with the conventional light diffusion sheet. Excellent light properties. Therefore, when this is used for a liquid crystal display, the brightness can be dramatically improved.
【図１】合成例１により得られた偏平状異形微粒子の電
子顕微鏡写真である。FIG. 1 is an electron micrograph of the flat irregularly shaped fine particles obtained in Synthesis Example 1.
【図２】実施例１で得られた光拡散シートの透過光度の
角度特性を表すグラフである。FIG. 2 is a graph showing an angle characteristic of transmitted light intensity of the light diffusion sheet obtained in Example 1.
【図３】実施例２で得られた光拡散シートの透過光度の
角度特性を表すグラフである。FIG. 3 is a graph showing an angle characteristic of transmitted light intensity of the light diffusion sheet obtained in Example 2.
【図４】実施例３で得られた光拡散シートの透過光度の
角度特性を表すグラフである。FIG. 4 is a graph showing an angle characteristic of transmitted light intensity of the light diffusion sheet obtained in Example 3.
【図５】比較例１で得られた光拡散シートの透過光度の
角度特性を表すグラフである。FIG. 5 is a graph showing an angle characteristic of transmitted light intensity of the light diffusion sheet obtained in Comparative Example 1.
【図６】比較例２で得られた光拡散シートの透過光度の
角度特性を表すグラフである。FIG. 6 is a graph showing an angle characteristic of transmitted light intensity of the light diffusion sheet obtained in Comparative Example 2.
【図７】比較例３で得られた光拡散シートの透過光度の
角度特性を表すグラフである。FIG. 7 is a graph showing an angle characteristic of transmitted light intensity of the light diffusion sheet obtained in Comparative Example 3.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H042 BA02 BA14 BA15 BA20 2H091 FA31Z FA32Z FA41Z FB02 FB12 LA16 LA18 4F100 AK01B AK03B AK25 AK41 AK42 AT00 AT00A BA02 BA10B DE02 DE02B GB48 JN01 JN01A JN06 JN06B YY00B 5G435 AA03 FF06 HH02 KK07 ────────────────────────────────────────────────── ─── Continued on the front page F-term (reference) 2H042 BA02 BA14 BA15 BA20 2H091 FA31Z FA32Z FA41Z FB02 FB12 LA16 LA18 4F100 AK01B AK03B AK25 AK41 AK42 AT00 AT00A BA02 BA10B DE02 DE02B GB48 JN01 JN01B06J06B0648
Claims (3)
樹脂および重合体微粒子からなる光拡散層を有する光拡
散シートにおいて、重合体微粒子がビニル系重合体から
なる偏平状異形微粒子であることを特徴とする光拡散シ
ート。1. A light diffusion sheet having a light diffusion layer composed of a binder resin and polymer fine particles on at least one surface of a transparent substrate, wherein the polymer fine particles are flat irregular fine particles composed of a vinyl polymer. Light diffusion sheet.
子の形状が、平面が略円形で、表面が凸状、裏面が凹状
である請求項１に記載の光拡散シート。2. The light diffusing sheet according to claim 1, wherein the flat irregularly shaped fine particles made of a vinyl polymer have a substantially circular flat surface, a convex surface, and a concave rear surface.
部に対して重合体微粒子を３０〜３００重量部含む請求
項１または２に記載の光拡散シート。3. The light diffusion sheet according to claim 1, wherein the light diffusion layer contains 30 to 300 parts by weight of polymer fine particles with respect to 100 parts by weight of the binder resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20536598A JP3478973B2 (en) | 1998-07-21 | 1998-07-21 | Light diffusion sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20536598A JP3478973B2 (en) | 1998-07-21 | 1998-07-21 | Light diffusion sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000039506A true JP2000039506A (en) | 2000-02-08 |
| JP3478973B2 JP3478973B2 (en) | 2003-12-15 |
Family
ID=16505655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20536598A Expired - Lifetime JP3478973B2 (en) | 1998-07-21 | 1998-07-21 | Light diffusion sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3478973B2 (en) |
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|---|---|---|---|---|
| WO2002103416A1 (en) * | 2001-06-14 | 2002-12-27 | Skc Co., Ltd. | The light-diffusing film and composition for the same |
| WO2003005072A1 (en) * | 2001-06-30 | 2003-01-16 | Skc Co., Ltd. | Light diffusing film |
| WO2003005071A1 (en) * | 2001-06-30 | 2003-01-16 | Skc Co., Ltd. | Light diffusing film |
| WO2005093468A1 (en) * | 2004-03-29 | 2005-10-06 | Tomoegawa Paper Co., Ltd. | Antiglare film |
| US6985295B2 (en) | 2001-06-09 | 2006-01-10 | Skc Co., Ltd. | Light diffusing film |
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| US7387832B2 (en) | 2002-09-19 | 2008-06-17 | Nisshinbo Industries, Inc. | Flat particles and process for production thereof |
| WO2008123517A1 (en) * | 2007-04-03 | 2008-10-16 | Jsr Corporation | Unregularly shaped particle, unregularly shaped particle composition, method for production of the composition, and light-diffusing molded article |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1283104A4 (en) * | 2000-05-19 | 2009-11-04 | Tdk Corp | Functional film |
| US6985295B2 (en) | 2001-06-09 | 2006-01-10 | Skc Co., Ltd. | Light diffusing film |
| WO2002103416A1 (en) * | 2001-06-14 | 2002-12-27 | Skc Co., Ltd. | The light-diffusing film and composition for the same |
| WO2003005072A1 (en) * | 2001-06-30 | 2003-01-16 | Skc Co., Ltd. | Light diffusing film |
| WO2003005071A1 (en) * | 2001-06-30 | 2003-01-16 | Skc Co., Ltd. | Light diffusing film |
| US7218450B2 (en) | 2001-06-30 | 2007-05-15 | Skc Co. Ltd. | Light diffusing film |
| US7387832B2 (en) | 2002-09-19 | 2008-06-17 | Nisshinbo Industries, Inc. | Flat particles and process for production thereof |
| WO2005093468A1 (en) * | 2004-03-29 | 2005-10-06 | Tomoegawa Paper Co., Ltd. | Antiglare film |
| US7283304B2 (en) | 2004-03-29 | 2007-10-16 | Tomoegawa Paper Co., Ltd. | Antiglare film |
| CN100353187C (en) * | 2004-03-29 | 2007-12-05 | 株式会社巴川制纸所 | Antiglare film |
| JP2007114331A (en) * | 2005-10-19 | 2007-05-10 | Gantsu Kasei Kk | Light diffusing organic fine particles and light diffusion resin molding using same |
| JP2007178519A (en) * | 2005-12-27 | 2007-07-12 | Stanley Electric Co Ltd | Light transmission film, manufacturing method, light emission device and condensing method |
| JP2007197588A (en) * | 2006-01-27 | 2007-08-09 | Jsr Corp | Deformed particle, deformed particle composition and its production method, and light diffusion molded product |
| KR101286907B1 (en) * | 2006-01-27 | 2013-07-16 | 제이에스알 가부시끼가이샤 | Irregular-shaped particle, irregular-shaped particle composition, method for producing same, and light diffusion molded article |
| WO2008123517A1 (en) * | 2007-04-03 | 2008-10-16 | Jsr Corporation | Unregularly shaped particle, unregularly shaped particle composition, method for production of the composition, and light-diffusing molded article |
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