JP2004170937A - Laminated resin plate - Google Patents
Laminated resin plate Download PDFInfo
- Publication number
- JP2004170937A JP2004170937A JP2003358837A JP2003358837A JP2004170937A JP 2004170937 A JP2004170937 A JP 2004170937A JP 2003358837 A JP2003358837 A JP 2003358837A JP 2003358837 A JP2003358837 A JP 2003358837A JP 2004170937 A JP2004170937 A JP 2004170937A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- water absorption
- laminated
- plate
- resin layer
- 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.)
- Pending
Links
- 239000011347 resin Substances 0.000 title claims abstract description 206
- 229920005989 resin Polymers 0.000 title claims abstract description 206
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000009792 diffusion process Methods 0.000 claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 claims description 58
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 32
- 238000000576 coating method Methods 0.000 claims description 27
- 239000011248 coating agent Substances 0.000 claims description 26
- 239000004925 Acrylic resin Substances 0.000 claims description 19
- 229920000178 Acrylic resin Polymers 0.000 claims description 19
- 229920001577 copolymer Polymers 0.000 claims description 17
- 239000004431 polycarbonate resin Substances 0.000 claims description 7
- 229920005668 polycarbonate resin Polymers 0.000 claims description 7
- 238000010030 laminating Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 55
- 239000004973 liquid crystal related substance Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 13
- 239000010419 fine particle Substances 0.000 description 10
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 9
- 238000002834 transmittance Methods 0.000 description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000454 talc Substances 0.000 description 3
- 229910052623 talc Inorganic materials 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000009125 cardiac resynchronization therapy Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000004611 light stabiliser Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- CNGYZEMWVAWWOB-VAWYXSNFSA-N 5-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-[(e)-2-[4-[[4-anilino-6-[bis(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulfophenyl]ethenyl]benzenesulfonic acid Chemical compound N=1C(NC=2C=C(C(\C=C\C=3C(=CC(NC=4N=C(N=C(NC=5C=CC=CC=5)N=4)N(CCO)CCO)=CC=3)S(O)(=O)=O)=CC=2)S(O)(=O)=O)=NC(N(CCO)CCO)=NC=1NC1=CC=CC=C1 CNGYZEMWVAWWOB-VAWYXSNFSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004419 Panlite Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
Images
Abstract
Description
本発明は近年液晶テレビなどに用いられているいわゆる直下型バックライト装置の拡散板に関する。 The present invention relates to a diffusion plate of a so-called direct-type backlight device used in a liquid crystal television or the like in recent years.
近年２１世紀の家庭用テレビとして国内外で注目を集めているのが液晶テレビである。
液晶は従来のテレビであるブラウン管のような自発光装置ではないため、液晶の背面にバックライト装置と呼ばれる光源装置を必要とする。
バックライト装置の種類には主に２つのタイプがあり、いわゆるエッジライト型もしくはサイドライト型と呼ばれる導光板を使う方法と、家庭用照明器具に似た直下型バックライト装置と呼ばれる拡散板を使う方法の２種類である。
ここでいう拡散板とは、ランプの前に設置される乳白色の樹脂板のことで、光を散乱させる機能があり光散乱シートとも呼ばれる板である。
In recent years, liquid crystal televisions have attracted attention in Japan and overseas as home televisions for the 21st century.
Since the liquid crystal is not a self-luminous device such as a conventional television such as a cathode ray tube, a light source device called a backlight device is required on the back of the liquid crystal.
There are two main types of backlight devices: a method using a light guide plate called a so-called edge light type or a side light type, and a method using a diffusion plate called a direct type backlight device similar to home lighting equipment. There are two types of methods.
The diffusion plate referred to here is a milky white resin plate installed in front of the lamp, and has a function of scattering light and is also called a light scattering sheet.
エッジライト型バックライト装置は薄型軽量化の要求でパソコンモニターやノートパソコンの画面、カーナビゲーションモニターや携帯電話の画面など幅広い分野でに広く普及しているが、画面が大きくなると光量が足りず暗いという問題を抱えている。
直下型バックライト装置は家庭用照明器具に似た単純な構造であるため以前はよく使われていたのだが、装置が分厚くなり薄型化の要求にこたえられないこと、多数のランプが必要で消費電力が多いことなどの理由からディスプレイ市場では残念ながらエッジライト型にシェアを奪われていた。
液晶テレビはブラウン管式テレビの代替を目指しており、画面の明るさもブラウン管並みの高輝度が必要とされている。ところがディスプレイ市場で圧倒的に使われているエッジライト型バックライト装置では画面が大きくなると画面中央付近の光量が足りず、ブラウン管の半分程度の輝度しか出すことができないのである。
Edge-light type backlight devices are widely used in a wide range of fields such as PC monitors, notebook PC screens, car navigation monitors and mobile phone screens due to the demand for thinner and lighter devices. I have a problem.
The direct-type backlight unit, which had a simple structure similar to a home lighting fixture, was often used before.However, the thicker unit could not meet the demand for thinning, and it required a large number of lamps to be consumed. Unfortunately, in the display market, the edge light type had lost its share because of the large amount of power.
LCD televisions are aiming to replace CRT televisions, and their screens need to be as bright as CRTs. However, in the edge light type backlight device which is overwhelmingly used in the display market, when the screen is large, the light amount near the center of the screen is not enough, and only about half the brightness of the cathode ray tube can be obtained.
一方直下型バックライト装置は画面が大きくなっても簡単に明るくすることが可能であるため、特に２０インチをこえるような液晶テレビにおいて直下型バックライト装置を使う動きが加速している。
図１に直下型バックライト装置の略図を示す。
直下型バックライト装置ではランプの光を散乱させるために拡散板と呼ばれる光散乱機能シートが設置される。
拡散板はランプの光を散乱させランプの形状が透けて見えないようにし、かつ光を均一に散乱させ画面上の明るさのムラを小さくするためのものであるが、光を散乱させる力ばかりが強いと透過光が弱くなり画面が暗くなってしまう問題がある。拡散板に求められている機能としてこれまで最も要求が強かったのは、高透過で高拡散というお互い相反する光学性能であった。
On the other hand, since the direct-type backlight device can easily make the screen bright even if the screen becomes large, the use of the direct-type backlight device is accelerated particularly in a liquid crystal television exceeding 20 inches.
FIG. 1 shows a schematic view of a direct type backlight device.
In the direct type backlight device, a light scattering function sheet called a diffusion plate is installed to scatter the light of the lamp.
The diffuser is used to scatter the light of the lamp so that the shape of the lamp cannot be seen through, and to scatter the light uniformly to reduce uneven brightness on the screen. When the intensity is high, there is a problem that transmitted light is weakened and the screen becomes dark. Until now, the most demanding functions required of the diffusion plate have been the mutually contradictory optical performances of high transmission and high diffusion.
この高透過高拡散の技術に対してはこれまでさまざまな方法が開示されてきた（例えば特許文献１〜３参照）。
ところが液晶テレビに直下型バックライト装置が使われるなかで最近、拡散板が反るという問題を市場から指摘されるようになってきた。具体的には拡散板が液晶パネル側に１ｍｍ以上反ってしまうという指摘である。拡散板と液晶パネルの隙間はちょうど１ｍｍほどしかなく、拡散板が１ｍｍ以上も反ってしまうと液晶パネルに接触し押し上げてしまうというのである。液晶パネルは極めて精密な部品であるため拡散板が接触し押し上げられてしまうと画面が乱れるばかりか、最悪の場合は液晶構造が破壊されてしまうため問題となっているのである。
Various methods have been disclosed for this technique of high transmission and high diffusion (for example, see Patent Documents 1 to 3).
However, recently, while a direct-type backlight device is used for a liquid crystal television, a problem that a diffusion plate is warped has been pointed out by a market. Specifically, it is pointed out that the diffusion plate warps toward the liquid crystal panel by 1 mm or more. The gap between the diffusion plate and the liquid crystal panel is just about 1 mm, and if the diffusion plate warps by 1 mm or more, it comes into contact with the liquid crystal panel and is pushed up. Since the liquid crystal panel is an extremely precise component, if the diffusion plate comes into contact with and is pushed up, not only the screen is disturbed, but in the worst case, the liquid crystal structure is destroyed, which is a problem.
直下型バックライト装置に取り付けられる拡散板は、その構造上、片面はランプに近接しランプの熱にさらされるため乾燥しているのに対し、反対面つまり液晶パネル側であり見る側は吸水しやすい環境にある。
これまで拡散板として市場で最も多く使われているのはアクリル樹脂板である。アクリル樹脂はプラスチックの中でも比較的吸水しやすい樹脂で、板表裏の吸水量の差によって板が反るという問題点を指摘されることがたびたびあった。
前述の拡散板が反るという問題は、拡散板の表裏の環境が異なり、つまり拡散板の片面が乾燥し逆側が吸水したアンバランスな状態になったため反ったものと考えられ、具体的には拡散板の片面がランプの熱で乾燥し縮んだため液晶パネル側に反ったものである。
この拡散板表裏での吸水量差による反りの問題については、拡散板の取り付け方や筐体とのクリアランスの量、放熱対策など直下型バックライト装置側での対策は検討されているものの、拡散板そのものでの改良は検討されていないのが現状であった。
Due to its structure, the diffusion plate attached to the direct-type backlight unit is dry because one side is close to the lamp and exposed to the heat of the lamp, whereas the opposite side, that is, the liquid crystal panel side and the viewer side absorb water. It is in an easy environment.
To date, acrylic resin plates have been the most widely used diffusion plates on the market. Acrylic resin is relatively easy to absorb water among plastics, and it has been often pointed out that the board is warped due to the difference in water absorption between the front and back of the board.
The problem of the above-mentioned diffusion plate warping is considered to be due to the fact that the environment of the front and back of the diffusion plate was different, that is, one side of the diffusion plate was dried and the other side absorbed water and became unbalanced. One side of the diffusion plate was dried and shrunk by the heat of the lamp and warped toward the liquid crystal panel.
Regarding the problem of warpage due to the difference in water absorption between the front and back of the diffusion plate, measures for the direct type backlight device, such as how to attach the diffusion plate, the amount of clearance with the housing, and heat dissipation measures, are being studied. At the present time, improvement of the board itself has not been considered.
本発明の課題は表裏で異なる接触雰囲気下でも反りが小さい拡散板を提供することを目的とする。 It is an object of the present invention to provide a diffusion plate having a small warpage even under different contact atmospheres.
本発明者は鋭意検討の結果、問題の拡散板の反りが拡散板最表面部分の吸水量によるものと考え、拡散板の最表面層だけを低吸水化することによって、驚くべきことに拡散板表裏で接触する雰囲気特に湿度が異なっていても拡散板の反りを格段に小さくできることを見出し本発明をなすに至った。
すなわち、本発明は、下記（１）から（４）の発明に係わる。
（１）樹脂（Ａ）からなる基材樹脂層に、吸水率０．０１〜０．４％の樹脂（Ｂ）からなる皮膜樹脂層が５〜３００μｍの厚みで積層されてなる積層樹脂板であって、
（樹脂（Ａ）の吸水率）−（樹脂（Ｂ）の吸水率）＝０．０１〜０．３９（％）
であることを特徴とする直下型バックライト拡散板用積層樹脂板。
As a result of intensive studies, the present inventor believed that the warpage of the diffusion plate in question was due to the amount of water absorption at the outermost surface of the diffusion plate, and surprisingly, by reducing only the outermost surface layer of the diffusion plate to low water absorption. The present inventors have found that the warpage of the diffusion plate can be remarkably reduced even if the atmosphere, especially the humidity, in which the contact is made on the front and back sides is different.
That is, the present invention relates to the following inventions (1) to (4).
(1) A laminated resin plate formed by laminating a coating resin layer made of a resin (B) having a water absorption of 0.01 to 0.4% with a thickness of 5 to 300 μm on a base resin layer made of a resin (A). So,
(Water absorption of resin (A))-(water absorption of resin (B)) = 0.01 to 0.39 (%)
A laminated resin plate for a direct type backlight diffusion plate, characterized in that:
（２）樹脂（Ａ）及び樹脂（Ｂ）に拡散剤が配合された上述（１）に記載の積層樹脂板。
（３）基材樹脂層の樹脂（Ａ）がアクリル樹脂、スチレン樹脂、メタクリル酸メチル・スチレン共重合物、ポリカーボネート樹脂のいずれかからなる上述（１）または（２）に記載の積層樹脂板。
（４）基材樹脂層の樹脂（Ａ）がアクリル樹脂であり、皮膜樹脂層の樹脂（Ｂ）がメタクリル酸メチル・スチレン共重合物である上述（１）〜（３）のいずれかに記載の積層樹脂板。
(2) The laminated resin plate according to the above (1), wherein a diffusing agent is blended into the resin (A) and the resin (B).
(3) The laminated resin plate according to the above (1) or (2), wherein the resin (A) of the base resin layer is made of any one of an acrylic resin, a styrene resin, a methyl methacrylate / styrene copolymer, and a polycarbonate resin.
(4) The resin according to any one of the above (1) to (3), wherein the resin (A) of the base resin layer is an acrylic resin and the resin (B) of the coating resin layer is a methyl methacrylate-styrene copolymer. Laminated resin plate.
本発明の積層樹脂板は直下型バックライト用の拡散板としての使用に際し反りが小さいという効果を有する。 The laminated resin plate of the present invention has an effect that warpage is small when used as a diffusion plate for a direct type backlight.
本発明について、以下具体的に説明する。
本発明で用いられる樹脂（Ａ）と樹脂（Ｂ）に用いられる樹脂としてはアクリル樹脂、スチレン樹脂、メタクリル酸メチル・スチレン共重合物、ポリカーボネート樹脂、ポリオレフィン樹脂、ポリエチレン樹脂、硬質ポリ塩化ビニル樹脂、ＡＢＳ樹脂、アクリロニトリル・スチレン樹脂などである。
メタクリル酸メチル・スチレン共重合物はＭＳ樹脂ともいわれメタクリル酸メチルいわゆるアクリルとスチレンを共重合させたものである。
このうち基材樹脂層に用いられる樹脂（Ａ）としては透明性と板状に成形しやすさからアクリル樹脂、スチレン樹脂、メタクリル酸メチル・スチレン共重合物、ポリカーボネート樹脂が好ましい。更により好ましくは屈折率が低く、拡散板として実績の多いアクリル樹脂を樹脂（Ａ）とし、樹脂（Ｂ）としてはアクリル樹脂と積層成形が容易なメタクリル酸メチル・スチレン共重合物いわゆるＭＳ樹脂の組合せである。
The present invention will be specifically described below.
Examples of the resin used in the resin (A) and the resin (B) used in the present invention include acrylic resin, styrene resin, methyl methacrylate / styrene copolymer, polycarbonate resin, polyolefin resin, polyethylene resin, hard polyvinyl chloride resin, ABS resin, acrylonitrile / styrene resin and the like.
Methyl methacrylate / styrene copolymer is also called MS resin and is a copolymer of methyl methacrylate, so-called acrylic and styrene.
Among them, the resin (A) used for the base resin layer is preferably an acrylic resin, a styrene resin, a methyl methacrylate / styrene copolymer, or a polycarbonate resin because of its transparency and ease of forming into a plate. More preferably, the resin (A) is an acrylic resin having a low refractive index and a good track record as a diffusion plate. As the resin (B), an acrylic resin and a methyl methacrylate-styrene copolymer that is easy to laminate and mold, a so-called MS resin, are used. It is a combination.
ＪＩＳ Ｋ７２０９に準拠して測定した上述各樹脂の２４時間の吸水率はアクリル樹脂が０．１〜０．４％、スチレン樹脂は０．０１〜０．０３％、ポリカーボネート樹脂は０．１〜０．２％、メタクリル酸メチル・スチレン共重合物は共重合されるアクリル成分とスチレン成分の比によって吸水率は０．０１〜０．４％範囲で変わり、例えばアクリル成分が８０重量％とスチレン成分が２０重量％になるよう共重合させた樹脂の吸水率は約０．１８％、アクリル成分が６０重量％でスチレン成分が４０重量％の樹脂は約０．１５％、アクリル成分が２０重量％でスチレン成分が８０重量％の樹脂は約０．１０％である。 The water absorption of the above resins measured in accordance with JIS K7209 for 24 hours is 0.1 to 0.4% for acrylic resin, 0.01 to 0.03% for styrene resin, and 0.1 to 0% for polycarbonate resin. 0.2%, the water absorption of the methyl methacrylate-styrene copolymer varies in the range of 0.01 to 0.4% depending on the ratio of the acrylic component and the styrene component to be copolymerized. Is about 0.18%, the resin having 60% by weight of acrylic component and 40% by weight of styrene component is about 0.15%, and the acrylic component is 20% by weight. The resin having a styrene component of 80% by weight is about 0.10%.
本発明で問題にしている直下型バックライト装置用拡散板の反りとは、拡散板の表裏で接触する雰囲気特に湿度の違いにより、拡散板表裏の吸水量に差が生じ反ってしまうことをいう。
具体的にいえば、拡散板は直下型バックライト装置に取り付けられており、拡散板の片面、ランプに面した面はランプの熱にさらされ乾燥するのに対し、反対側の面つまり液晶パネルに面する面が吸水している状態であれば、拡散板としては吸水している面を凸に反りが現れる。つまり液晶パネル側に凸、ランプ側に凹に反るのである。
The warpage of the diffusion plate for a direct type backlight device, which is a problem in the present invention, means that a difference occurs in the amount of water absorption between the front and back surfaces of the diffusion plate due to a difference in atmosphere, particularly humidity, in contact with the front and back surfaces of the diffusion plate. .
Specifically, the diffusion plate is attached to a direct-type backlight device, and one surface of the diffusion plate, the surface facing the lamp, is exposed to the heat of the lamp and dried, while the opposite surface, that is, the liquid crystal panel If the surface facing the surface is absorbing water, the diffusing plate warps convexly on the surface absorbing water. In other words, it is convex toward the liquid crystal panel and concave toward the lamp.
当然この反りは小さければ小さいほど好ましく、究極には反り無し、つまり全く反らないことがよいのだが、現在開発中の液晶テレビ向け直下型バックライト装置では、拡散板と液晶パネルの隙間が１ｍｍほど取っており、反りは１ｍｍ未満であることが求められている。拡散板が１ｍｍ以上も反ってしまうと液晶パネルに接触し、液晶パネルを押し上げてしまうため画像に乱れを生じ、最悪の場合は液晶構造が破壊されてしまう。 Naturally, the smaller this warp is, the better it is. Ultimately, there is no warp, that is, it is better not to warp at all. The warpage is required to be less than 1 mm. If the diffusing plate warps by 1 mm or more, the diffuser comes into contact with the liquid crystal panel and pushes up the liquid crystal panel, causing an image to be disturbed. In the worst case, the liquid crystal structure is destroyed.
本発明は拡散板のごくごく表面だけを低吸水化するだけで、拡散板表裏で接触する雰囲気、特に湿度が異なっていても拡散板の反りを格段に小さくできることを見出し、拡散板表面に低吸水樹脂層を皮膜樹脂層として積層し積層拡散板とすることを特徴としている。
本発明では皮膜樹脂層である樹脂（Ｂ）は基材樹脂層である樹脂（Ａ）より低吸水、つまり吸水率が小さくなければならない。吸水率とはＪＩＳ Ｋ７２０９によって測定した２４時間の吸水率をいい、数値が大きいほど吸水しやすく、逆に小さいほど吸水しにくいことを示す指標である。基材樹脂層として用いられる上述した樹脂(Ａ)の吸水率は０．０１〜０．４％、好ましくは０．１〜０．３％である。本発明においては皮膜樹脂と基材樹脂の吸水率の差、つまり、
（樹脂（Ａ）の吸水率）−（樹脂（Ｂ）の吸水率）＝０．０１〜０．３９（％）
であることが好ましく、さらに好ましくは、
（樹脂（Ａ）の吸水率）−（樹脂（Ｂ）の吸水率）＝０．０１〜０．２（％）
である。反りが１ｍｍ以下であるために吸水率差は０．０１％以上であり、外観の点から０．３９％以下である。
The present invention has found that only the very low surface of the diffusion plate is made to have low water absorption, and that the diffusion plate warpage can be significantly reduced even when the atmosphere in which the diffusion plate is in contact with the front and back surfaces, especially when the humidity is different, has been found. It is characterized in that a resin layer is laminated as a film resin layer to form a laminated diffusion plate.
In the present invention, the resin (B), which is the film resin layer, must have lower water absorption, that is, a lower water absorption than the resin (A), which is the base resin layer. The water absorption refers to the water absorption for 24 hours measured according to JIS K7209, and is an index indicating that the larger the value, the easier the water absorption, and the smaller the value, the less the water absorption. The water absorption of the resin (A) used as the base resin layer is 0.01 to 0.4%, preferably 0.1 to 0.3%. In the present invention, the difference between the water absorption of the film resin and the base resin, that is,
(Water absorption of resin (A))-(water absorption of resin (B)) = 0.01 to 0.39 (%)
Is more preferable, and more preferably,
(Water absorption of resin (A))-(water absorption of resin (B)) = 0.01 to 0.2 (%)
It is. Since the warpage is 1 mm or less, the difference in water absorption is 0.01% or more, and from the viewpoint of appearance, it is 0.39% or less.
皮膜樹脂層の厚みとしては基材樹脂層に５〜３００μｍ、より好ましくは１０〜２００μｍで積層することが好ましい。反りが１ｍｍ以下であるために皮膜樹脂層の厚みが５μｍ以上であり、積層成形の観点から３００μｍ以下である。また、皮膜樹脂層は基材樹脂層の両面に積層されることが好ましく、皮膜樹脂の厚みは両面で異なっていても良いことはいうまでもない。
積層樹脂板を作成する方法としては共押出法、フィルムラミネート法、コーティング法などがあるが、本発明では装置が簡単で連続的に安定した品質の積層樹脂板が得られる共押出法がより好ましい。共押出法とは、基材樹脂層になる樹脂（Ａ）と皮膜樹脂層になる樹脂（Ｂ）をそれぞれ別の押出機で加熱溶融押し出し、シート状に拡幅する金型いわゆるダイの中で合流し積層させ、ポリッシングロール等を介してシート状に成形する方法である。
The thickness of the coating resin layer is preferably 5 to 300 μm, more preferably 10 to 200 μm, on the base resin layer. Since the warpage is 1 mm or less, the thickness of the coating resin layer is 5 μm or more, and is 300 μm or less from the viewpoint of lamination molding. Also, the coating resin layer is preferably laminated on both surfaces of the base resin layer, and it goes without saying that the thickness of the coating resin may be different on both surfaces.
Examples of a method for producing a laminated resin plate include a co-extrusion method, a film laminating method, and a coating method. In the present invention, a co-extrusion method that can obtain a laminated resin plate of stable quality with a simple apparatus is more preferable. . The co-extrusion method is a method in which a resin (A) to be a base resin layer and a resin (B) to be a film resin layer are melted and extruded by separate extruders, and are joined in a so-called die that widens into a sheet shape. This is a method of forming the sheet into a sheet through a polishing roll or the like.
共押出法は一般的な樹脂板の押出製造設備に皮膜樹脂用の押出機が追加されただけの構造的にも簡便な積層樹脂板成形方法なのである。
共押出成形の条件は一般的に行われている樹脂板の押出条件と同じで、流す樹脂によって設定温度は異なるのだが、おおよそ基材樹脂用押出機、皮膜樹脂用押出機及び積層ダイの温度が２００〜３２０℃、３本〜６本並べられるポリッシングロールの温度はそれぞれ約６０〜１５０℃の範囲で設定すればよい。ダイの温度は基材樹脂層の樹脂（Ａ）の推奨成形条件に合わせ、ポリッシングロールの温度は皮膜樹脂層の樹脂（Ｂ）の推奨条件に合わせるとさらに外観良好な積層樹脂板が得られる。
The coextrusion method is a structurally simple method of forming a laminated resin plate simply by adding an extruder for a film resin to a general resin plate extrusion manufacturing facility.
The co-extrusion molding conditions are the same as the general extrusion conditions for resin plates, and the set temperature differs depending on the resin flowing. However, the temperature of the extruder for the base resin, the extruder for the film resin, and the laminating die is approximately the same. The temperature of the polishing rolls arranged at 200 to 320 ° C. and three to six may be set in the range of about 60 to 150 ° C., respectively. When the temperature of the die is adjusted to the recommended molding conditions of the resin (A) of the base resin layer, and the temperature of the polishing roll is adjusted to the recommended conditions of the resin (B) of the coating resin layer, a laminated resin plate having a better appearance can be obtained.
積層樹脂板の板厚は１〜５ｍｍで設計するのが好ましい。現在直下型バックライト装置用拡散板の板厚は２〜３ｍｍである。画面が大きくなると自重によるたわみを抑えるため板厚は厚くし、逆に画面が小さければ薄くしている。
板厚の制御は積層樹脂板の押出成形時にポリッシングロールの間隙を調整することによって自由に変えることができる。
The thickness of the laminated resin plate is preferably designed to be 1 to 5 mm. At present, the thickness of the diffusion plate for a direct type backlight device is 2-3 mm. When the screen is large, the thickness is increased to suppress the deflection due to its own weight, and conversely, when the screen is small, the thickness is reduced.
The thickness can be controlled freely by adjusting the gap between the polishing rolls during extrusion molding of the laminated resin plate.
本発明の積層樹脂板には直下型バックライト装置用拡散板として光を散乱させる機能を付与するために、樹脂（Ａ）及び樹脂（Ｂ）にはそれぞれ拡散剤が配合される。
配合される拡散剤としては有機系もしくは無機系の拡散剤があるが、好ましくはアクリル系架橋微粒子、スチレン系架橋微粒子、メタクリル酸メチル・スチレン共重合物系架橋微粒子、シリコーン系架橋微粒子、炭酸カルシウム、硫酸バリウム、酸化チタン、タルク、マイカである。特に樹脂（Ａ）に配合される拡散剤として更に好ましいのは屈折率が最も低く高拡散化が可能なシリコーン系架橋微粒子である。これら拡散剤は単独で使用しても２種類もしくは３種類併用されていてもかまわない。拡散剤を併用することによって視野角を様々な角度に設計することが可能になる。
The resin (A) and the resin (B) each contain a diffusing agent in order to impart a function of scattering light as a diffusion plate for a direct type backlight device to the laminated resin plate of the present invention.
Examples of the diffusing agent to be blended include organic or inorganic diffusing agents, preferably acrylic crosslinked fine particles, styrene crosslinked fine particles, methyl methacrylate / styrene copolymer crosslinked fine particles, silicone crosslinked fine particles, and calcium carbonate. , Barium sulfate, titanium oxide, talc and mica. Particularly preferred as the diffusing agent to be mixed with the resin (A) are silicone-based crosslinked fine particles having the lowest refractive index and capable of increasing the diffusion. These diffusing agents may be used alone or in combination of two or three. The use of a diffusing agent makes it possible to design the viewing angle at various angles.
また皮膜樹脂層に拡散剤を配合することによって拡散性を更に上げることが可能になるばかりか拡散板表面をマット状にすることができる。樹脂（Ａ）と樹脂（Ｂ）に配合される拡散剤は同じでも異なっていてもよいが樹脂（Ｂ）に配合される拡散剤として更により好ましいのは粒子径が比較的大きいアクリル系架橋微粒子、スチレン系架橋微粒子、メタクリル酸メチル・スチレン共重合物系架橋微粒子、タルクやマイカである。
拡散剤の平均粒径は、拡散効果の観点から平均粒径が１μｍ以上であり、全光線透過率の微調整の観点から５０μｍ以下が好ましい。
In addition, by adding a diffusing agent to the film resin layer, not only can the diffusivity be further improved, but also the surface of the diffusing plate can be made mat-like. The diffusing agent to be blended in the resin (A) and the resin (B) may be the same or different, but it is still more preferable that the diffusing agent to be blended in the resin (B) is acrylic crosslinked fine particles having a relatively large particle diameter. Styrene-based crosslinked fine particles, methyl methacrylate / styrene copolymer-based crosslinked fine particles, talc and mica.
The average particle diameter of the diffusing agent is preferably 1 μm or more from the viewpoint of the diffusion effect, and is preferably 50 μm or less from the viewpoint of fine adjustment of the total light transmittance.
本発明の積層樹脂板の全光線透過率は配合される拡散剤の量を調整することで任意に設計できる。一般に拡散板としては全光線透過率４０％〜８０％のものが求められており本発明でもその範囲になるよう拡散剤の配合量を調整すればよく、その量は配合する拡散剤の種類と粒径によっても異なるが樹脂（Ａ）もしくは樹脂（Ｂ）それぞれに対し０．１〜２０重量％、好ましくは０．５〜１５重量％である。当然配合量が多いと全光線透過率は下がり暗くなるが拡散性能は上がり、逆に配合量が少ないと全光線透過率が上がり明るくなるが拡散性能が下がる。樹脂（Ａ）及び樹脂（Ｂ）に配合される拡散剤の量は同じ量でも異なっていてもよい。 The total light transmittance of the laminated resin plate of the present invention can be arbitrarily designed by adjusting the amount of the diffusing agent to be blended. In general, the diffusion plate is required to have a total light transmittance of 40% to 80%. In the present invention, the amount of the diffusing agent may be adjusted so as to fall within the range. Although it depends on the particle size, it is 0.1 to 20% by weight, preferably 0.5 to 15% by weight, based on the resin (A) or the resin (B), respectively. Naturally, if the blending amount is large, the total light transmittance decreases and the image becomes dark, but the diffusion performance increases. Conversely, if the blending amount is small, the total light transmittance increases and the brightness increases, but the diffusing performance decreases. The amount of the diffusing agent blended in the resin (A) and the resin (B) may be the same or different.
また樹脂（Ａ）及び樹脂（Ｂ）には必要に応じその他の各種添加剤が配合される。具体的には紫外線吸収剤や酸化防止剤、光安定剤、帯電防止剤、各種染料や顔料、蛍光増白剤、選択波長吸収剤である。これらも拡散剤同様に１種類単独でも数種類併用されていてもかまわないし、樹脂（Ａ）、樹脂（Ｂ）に配合されるこれら各種添加剤は同じであっても異なっていてもよい。
積層樹脂板であるから、基材樹脂層と皮膜樹脂層で拡散剤や添加剤を変え機能を分担することも可能である。例えば、皮膜樹脂層は紫外線吸収剤、光安定剤、帯電防止剤を添加し耐光性改良や帯電防止機能を付与し、基材樹脂層には染料、顔料、蛍光増白剤、選択波長吸収剤などを配合し色調調整や透過波長調整機能を付与することが考えられる。
The resin (A) and the resin (B) may contain other various additives as necessary. Specific examples include ultraviolet absorbers, antioxidants, light stabilizers, antistatic agents, various dyes and pigments, optical brighteners, and selective wavelength absorbers. One of these may be used alone or a plurality of them may be used in combination like the diffusing agent, and these various additives to be mixed with the resin (A) and the resin (B) may be the same or different.
Since it is a laminated resin plate, it is also possible to change the diffusing agent or additive between the base resin layer and the coating resin layer to share functions. For example, the coating resin layer adds an ultraviolet absorber, a light stabilizer, and an antistatic agent to impart light resistance improvement and an antistatic function, and the base resin layer includes a dye, a pigment, a fluorescent brightener, and a selective wavelength absorber. It is conceivable to add a function such as color tone adjustment or transmission wavelength adjustment by blending the above.
本発明を実施例に基づいて説明する。
また、実施例、比較例で用いた試験方法は次のとおりである。
（１）吸水率：作成した積層樹脂板から５０ｍｍ角の試験片を切り出し、ＪＩＳ Ｋ７２０９に準拠し２４時間の吸水率を測定する。
（２）反り：直下型バックライト装置において拡散板に発生する反りを実験的に再現し定量化するため、次の方法で試験を行った。
作成した積層樹脂板を市販の２０インチ液晶テレビに拡散板として組み込み、バックライトを点灯させ２４時間放置した。点灯前と２４時間点灯後で積層樹脂板中央部のたわみ変形量を測定し反りとして求めた。
（３）全光線透過率：作成した積層樹脂板から５０ｍｍ角の試験片を切り出し、ＪＩＳ Ｋ７１０５に準拠し全光線透過率を測定する。
（４）ヘーズ：作成した積層樹脂板から５０ｍｍ角の試験片を切り出し、ＪＩＳ Ｋ７１０５に準拠しヘーズを測定する。
The present invention will be described based on examples.
The test methods used in the examples and comparative examples are as follows.
(1) Water absorption: A 50 mm square test piece is cut out from the prepared laminated resin plate, and the water absorption for 24 hours is measured according to JIS K7209.
(2) Warp: In order to experimentally reproduce and quantify the warp generated in the diffusion plate in the direct-type backlight device, a test was performed by the following method.
The produced laminated resin plate was incorporated into a commercially available 20-inch liquid crystal television as a diffusion plate, and the backlight was turned on and left for 24 hours. The amount of flexural deformation at the center of the laminated resin plate was measured before lighting and after lighting for 24 hours, and determined as warpage.
(3) Total light transmittance: A 50 mm square test piece is cut out from the prepared laminated resin plate, and the total light transmittance is measured in accordance with JIS K7105.
(4) Haze: A 50 mm square test piece is cut out from the prepared laminated resin plate, and the haze is measured according to JIS K7105.
［実施例１］
基材樹脂層用の樹脂（Ａ）として吸水率０．３０％のアクリル樹脂（旭化成株式会社製製品名『デルペットＬＰ−１』）を、皮膜樹脂層用の樹脂（Ｂ）として吸水率０．１５％のメタクリル酸メチル・スチレン共重合物（新日鐵化学株式会社製製品名『エスチレンＭＳ６００』、以下ＭＳ樹脂１と表す。）を用い、１００ｍｍ及び５０ｍｍの押出機と１２００ｍｍ幅の積層シート用ダイ、幅１５００ｍｍの縦型３本ポリッシングロールからなる積層樹脂板押出装置を用いた共押出成形によって皮膜樹脂層が基材樹脂層の両面に５０μｍずつ積層された板厚２ｍｍ、幅１０００ｍｍの積層樹脂板を作成した。
このときの樹脂（Ａ）の吸水率−樹脂（Ｂ）の吸水率差は０．１５％である。
前述の試験方法に従った試験結果を比較例とともに表１に示す。
その結果、該積層樹脂板の吸水率は０．２５％であった。
皮膜樹脂層に低吸水率の樹脂を積層しても、試験片の切り出しによって生じた切断面いわゆる端面に基材層樹脂が露出し、この露出した基材層樹脂から吸水するため吸水率としては大きくは下がらないが、驚くべきことに０．５ｍｍしか反らなかった。皮膜樹脂層の効果が大きく現れた結果となった。
[Example 1]
An acrylic resin having a water absorption of 0.30% (product name "Delpet LP-1" manufactured by Asahi Kasei Corporation) is used as the resin (A) for the base resin layer, and a water absorption of 0 is used as the resin (B) for the coating resin layer. Using a 15% methyl methacrylate-styrene copolymer (product name “Estyrene MS600” manufactured by Nippon Steel Chemical Co., Ltd., hereinafter referred to as MS resin 1), a 100 mm and 50 mm extruder and a 1200 mm wide laminated sheet A coating resin layer is laminated on both sides of a base resin layer by 50 μm by co-extrusion molding using a laminated resin plate extruder comprising three vertical polishing rolls having a width of 1500 mm and a thickness of 2 mm and a width of 1000 mm. A resin plate was created.
At this time, the difference between the water absorption of the resin (A) and the water absorption of the resin (B) is 0.15%.
The test results according to the test method described above are shown in Table 1 together with Comparative Examples.
As a result, the water absorption of the laminated resin plate was 0.25%.
Even if a resin having a low water absorption rate is laminated on the coating resin layer, the base layer resin is exposed on the so-called end surface of the cut surface formed by cutting out the test piece, and the water absorption from the exposed base layer resin is as follows. It did not drop much, but surprisingly only warped 0.5 mm. As a result, the effect of the coating resin layer was greatly exhibited.
［比較例１］
基材樹脂層用の樹脂（Ａ）及び皮膜樹脂層用の樹脂（Ｂ）にいずれも同じ吸水率０．３０％のアクリル樹脂（旭化成株式会社製製品名『デルペットＬＰ−１』）を用い、実施例１同様の共押出成形で皮膜樹脂層が基材樹脂層の両面に５０μｍずつ積層された板厚２ｍｍの積層樹脂板を作成した。
このときの樹脂（Ａ）の吸水率−樹脂（Ｂ）の吸水率差は０％である。
試験結果を実施例とともに表１に示す。
その結果、該積層樹脂板の吸水率は０．３０％と当然のことながらアクリル樹脂そのものである。課題である反りの試験では３ｍｍも反ってしまっており問題である。
この比較例１の反り３ｍｍと、実施例１の反り０．５ｍｍの大きな差こそが、本発明の効果である。
[Comparative Example 1]
Acrylic resin (product name "Delpet LP-1" manufactured by Asahi Kasei Corporation) having the same water absorption of 0.30% was used for both the resin (A) for the base resin layer and the resin (B) for the coating resin layer. Then, a laminated resin plate having a thickness of 2 mm in which a coating resin layer was laminated on both surfaces of the base resin layer by 50 μm by coextrusion molding in the same manner as in Example 1 was prepared.
At this time, the difference between the water absorption of the resin (A) and the water absorption of the resin (B) is 0%.
The test results are shown in Table 1 together with the examples.
As a result, the laminated resin plate has a water absorption of 0.30%, which is naturally the acrylic resin itself. In the warpage test, which is an issue, the warp is warped by 3 mm, which is a problem.
The great difference between the warp of 3 mm of Comparative Example 1 and the warp of 0.5 mm of Example 1 is the effect of the present invention.
［比較例２］
基材樹脂層用の樹脂（Ａ）として吸水率０．１８％のメタクリル酸メチル・スチレン共重合物（新日鐵化学株式会社製製品名『エスチレンＭＳ８００』、以下ＭＳ樹脂３と表す。）を、皮膜樹脂層用の樹脂（Ｂ）として吸水率０．３０％のアクリル樹脂（旭化成株式会社製製品名『デルペットＬＰ−１』）を用い、共押出成形によって実施例１同様に皮膜樹脂層が基材樹脂層の両面に５０μｍずつ積層された板厚２ｍｍの積層樹脂板を作成した。
このときの樹脂（Ａ）の吸水率−樹脂（Ｂ）の吸水率差は−０．１２％である。
試験結果を実施例とともに表１に示す。
[Comparative Example 2]
As the resin (A) for the base resin layer, a methyl methacrylate / styrene copolymer having a water absorption of 0.18% (product name “Estyrene MS800” manufactured by Nippon Steel Chemical Co., Ltd .; hereinafter, referred to as MS resin 3). An acrylic resin having a water absorption of 0.30% (product name "Delpet LP-1" manufactured by Asahi Kasei Corporation) was used as the resin (B) for the coating resin layer, and the coating resin layer was formed in the same manner as in Example 1 by coextrusion molding. Was laminated on both sides of the base resin layer to form a laminated resin plate having a thickness of 2 mm.
At this time, the difference between the water absorption of the resin (A) and the water absorption of the resin (B) is -0.12%.
The test results are shown in Table 1 together with the examples.
その結果、該積層樹脂板の吸水率を測定すると０．２８％であった。
基材樹脂層の樹脂（Ａ）つまりメタクリル酸メチル・スチレン共重合物そのものの吸水率は低いのだが、皮膜樹脂層に吸水率の高い樹脂つまりアクリル樹脂を積層しているため、試験片表面からの吸水の影響で積層樹脂板の吸水率としてはアクリル樹脂とあまり変わらない。
また反り試験においても皮膜樹脂層に用いたアクリル樹脂の影響で驚くべきことに比較例１と同じく３ｍｍも反ってしまっており、基材樹脂層の低吸湿樹脂の効果が全く失われた結果となった。
As a result, the measured water absorption of the laminated resin plate was 0.28%.
Although the water absorption of the resin (A) of the base resin layer, that is, the methyl methacrylate / styrene copolymer itself, is low, the resin with a high water absorption, that is, the acrylic resin, is laminated on the film resin layer. The water absorption of the laminated resin plate is not so different from that of acrylic resin due to the influence of water absorption.
Also in the warp test, the effect of the acrylic resin used for the coating resin layer was surprisingly warped by 3 mm as in Comparative Example 1, and the effect of the low moisture absorption resin of the base resin layer was completely lost. became.
［実施例２］
実施例１同様に基材樹脂層用の樹脂（Ａ）として吸水率０．３０％のアクリル樹脂（旭化成株式会社製製品名『デルペットＬＰ−１』）を、皮膜樹脂層用の樹脂（Ｂ）として吸水率０．１５％のメタクリル酸メチル・スチレン共重合物（新日鐵化学株式会社製製品名『エスチレンＭＳ６００』）を用いる。樹脂（Ａ）には拡散剤としてシリコーン系架橋微粒子（ＧＥ東芝シリコーン株式会社製製品名『トスパール１２０』）を５ｗｔ％配合し、樹脂（Ｂ）には拡散剤としてタルクを１５ｗｔ％配合し実施例１同様に共押出成形によって皮膜樹脂層が基材樹脂層の両面に５０μｍずつ積層された板厚２ｍｍの積層樹脂板を作成した。作成された積層拡散板の全光線透過率は５２％となり、ヘーズは９２％であった。
このときの樹脂（Ａ）の吸水率−樹脂（Ｂ）の吸水率差は実施例１と同じ０．１５％である。
吸水率及び反りを実施例１同様に測定した結果、拡散剤を配合した影響はなく、吸水率が０．２５％、反りは０．５ｍｍという結果であった。
[Example 2]
Similarly to Example 1, an acrylic resin having a water absorption of 0.30% (product name "Delpet LP-1" manufactured by Asahi Kasei Corporation) was used as the resin (A) for the base resin layer and the resin (B) for the coating resin layer. )), A methyl methacrylate-styrene copolymer having a water absorption of 0.15% (product name “Estyrene MS600” manufactured by Nippon Steel Chemical Co., Ltd.) is used. Resin (A) was blended with 5% by weight of silicone-based crosslinked fine particles (product name "Tospearl 120" manufactured by GE Toshiba Silicone Co., Ltd.) as a diffusing agent, and resin (B) was blended with 15% by weight of talc as a diffusing agent. 1 Similarly, a laminated resin plate having a thickness of 2 mm in which a coating resin layer was laminated on both surfaces of the base resin layer by 50 μm by coextrusion molding was prepared. The total light transmittance of the formed laminated diffusion plate was 52%, and the haze was 92%.
At this time, the difference between the water absorption of the resin (A) and the water absorption of the resin (B) is 0.15%, which is the same as in Example 1.
The water absorption and the warpage were measured in the same manner as in Example 1. As a result, there was no effect of mixing the diffusing agent, and the result was that the water absorption was 0.25% and the warpage was 0.5 mm.
［実施例３〜６、比較例３］
皮膜樹脂層厚みを表1に示す通りに変更した以外は実施例１と同様に行った。
[Examples 3 to 6, Comparative Example 3]
Example 1 was repeated except that the thickness of the coating resin layer was changed as shown in Table 1.
［実施例７〜１０］
基材樹脂層に用いる樹脂（Ａ）及び皮膜樹脂層に用いる樹脂（Ｂ）を表１に示すとおりに変更し、共押出成形によって皮膜樹脂層が基材樹脂層の両面に５０μｍずつ積層された板厚２ｍｍの積層樹脂板を作成した。
表１中のＭＳ樹脂２には吸水率０．１％のメタクリル酸メチル・スチレン共重合物（新日鐵化学株式会社製製品名『エスチレンＭＳ２００』）を用いた。またポリカーボネート樹脂には吸水率０．２％のポリカーボネート樹脂（帝人化成株式会社製製品名『パンライトＬ１２５０』）を用いた。
[Examples 7 to 10]
The resin (A) used for the base resin layer and the resin (B) used for the coating resin layer were changed as shown in Table 1, and the coating resin layers were laminated on both surfaces of the base resin layer by 50 μm by co-extrusion molding. A laminated resin plate having a thickness of 2 mm was prepared.
As the
［実施例１１］
皮膜樹脂層厚みが１００μｍになるよう成形した以外は実施例２同様に行った。
[Example 11]
The procedure was performed in the same manner as in Example 2 except that the coating resin layer was formed so as to have a thickness of 100 μm.
［実施例１２］
樹脂（Ｂ）に配合する拡散剤をアクリル系架橋微粒子（積水化成品株式会社製製品名『テクポリマーＭＢＸ−１２』）１５重量％に変更した以外は実施例２同様に行った。
[Example 12]
The procedure was performed in the same manner as in Example 2 except that the diffusing agent to be mixed into the resin (B) was changed to 15% by weight of acrylic crosslinked fine particles (product name “Techpolymer MBX-12” manufactured by Sekisui Chemical Co., Ltd.).
本発明の積層樹脂板は、直下型バックライト装置用拡散板の分野で好適に利用できる。 The laminated resin plate of the present invention can be suitably used in the field of a diffusion plate for a direct type backlight device.
１：液晶パネル
２：輝度向上フィルム
３：拡散板
４：ランプ
５：反射フィルム
６：筐体
1: liquid crystal panel 2: brightness enhancement film 3: diffusion plate 4: lamp 5: reflective film 6: housing
Claims (4)
（樹脂（Ａ）の吸水率）−（樹脂（Ｂ）の吸水率）＝０．０１〜０．３９（％）
であることを特徴とする直下型バックライト拡散板用積層樹脂板。 A laminated resin plate comprising a base resin layer made of resin (A) and a coating resin layer made of resin (B) having a water absorption of 0.01 to 0.4% with a thickness of 5 to 300 μm,
(Water absorption of resin (A))-(water absorption of resin (B)) = 0.01 to 0.39 (%)
A laminated resin plate for a direct type backlight diffusion plate, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003358837A JP2004170937A (en) | 2002-11-06 | 2003-10-20 | Laminated resin plate |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002322031 | 2002-11-06 | ||
| JP2003358837A JP2004170937A (en) | 2002-11-06 | 2003-10-20 | Laminated resin plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2004170937A true JP2004170937A (en) | 2004-06-17 |
Family
ID=32715972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003358837A Pending JP2004170937A (en) | 2002-11-06 | 2003-10-20 | Laminated resin plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2004170937A (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006106185A (en) * | 2004-10-01 | 2006-04-20 | Kuraray Co Ltd | Light diffusion multilayer plate |
| JP2006126451A (en) * | 2004-10-28 | 2006-05-18 | Dainippon Printing Co Ltd | Transmission-type display device |
| JP2006133528A (en) * | 2004-11-05 | 2006-05-25 | Takiron Co Ltd | Anti-static light diffusion sheet |
| JP2006133567A (en) * | 2004-11-08 | 2006-05-25 | Denki Kagaku Kogyo Kk | Light diffusion plate |
| JP2006343672A (en) * | 2005-06-10 | 2006-12-21 | Dainippon Printing Co Ltd | Light control sheet and surface light source device |
| WO2007058033A1 (en) * | 2005-11-15 | 2007-05-24 | Asahi Kasei Chemicals Corporation | Light diffusion plate for liquid crystal display |
| JP2007219456A (en) * | 2006-01-20 | 2007-08-30 | Sumitomo Chemical Co Ltd | Heat-resistant light diffusion plate |
| JP2007309978A (en) * | 2006-05-16 | 2007-11-29 | Teijin Chem Ltd | Direct backlight type liquid crystal display device and light diffusing plate |
| EP1895332A2 (en) | 2006-08-28 | 2008-03-05 | Sumitomo Chemical Company, Limited | Light Diffusing Plate |
| JP2008122817A (en) * | 2006-11-15 | 2008-05-29 | Dainippon Printing Co Ltd | Optical sheet and surface light source device |
| JP2008292977A (en) * | 2007-04-25 | 2008-12-04 | Sumitomo Chemical Co Ltd | Light diffuser plate |
| JP2009031466A (en) * | 2007-07-26 | 2009-02-12 | Toppan Printing Co Ltd | Optical sheet and display device |
| JP2009103884A (en) * | 2007-10-23 | 2009-05-14 | Goyo Paper Working Co Ltd | Punchable abrasion flaw-resistant double layer lens film |
| US7932967B2 (en) | 2008-03-18 | 2011-04-26 | Sumitomo Chemical Company, Limited | Brightness enhancement film-laminated light diffuser plate and method for producing the same |
| KR101150198B1 (en) * | 2005-06-16 | 2012-06-12 | 엘지디스플레이 주식회사 | Backlight unit for liquid crystal display device |
| JP2012111138A (en) * | 2010-11-25 | 2012-06-14 | Sumitomo Chemical Co Ltd | Light diffusing laminated resin plate and method for manufacturing the same |
| JP2013086272A (en) * | 2011-10-13 | 2013-05-13 | Sumitomo Chemical Co Ltd | Resin plate, scratch-resistant resin plate using the same, protective plate for display, display window protective plate of portable information terminal, protective plate for touch panel, and method for manufacturing the resin plate |
| CN113267835A (en) * | 2020-01-29 | 2021-08-17 | 住友化学株式会社 | Film roll |
| CN114624922A (en) * | 2022-03-17 | 2022-06-14 | 纳晶科技股份有限公司 | Quantum dot optical plate and light-emitting device comprising same |
-
2003
- 2003-10-20 JP JP2003358837A patent/JP2004170937A/en active Pending
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006106185A (en) * | 2004-10-01 | 2006-04-20 | Kuraray Co Ltd | Light diffusion multilayer plate |
| JP2006126451A (en) * | 2004-10-28 | 2006-05-18 | Dainippon Printing Co Ltd | Transmission-type display device |
| JP2006133528A (en) * | 2004-11-05 | 2006-05-25 | Takiron Co Ltd | Anti-static light diffusion sheet |
| JP2006133567A (en) * | 2004-11-08 | 2006-05-25 | Denki Kagaku Kogyo Kk | Light diffusion plate |
| JP2006343672A (en) * | 2005-06-10 | 2006-12-21 | Dainippon Printing Co Ltd | Light control sheet and surface light source device |
| JP4684753B2 (en) * | 2005-06-10 | 2011-05-18 | 大日本印刷株式会社 | Light control sheet and surface light source device |
| KR101150198B1 (en) * | 2005-06-16 | 2012-06-12 | 엘지디스플레이 주식회사 | Backlight unit for liquid crystal display device |
| EP1950605A1 (en) * | 2005-11-15 | 2008-07-30 | Asahi Kasei Chemicals Corporation | Light diffusion plate for liquid crystal display |
| WO2007058033A1 (en) * | 2005-11-15 | 2007-05-24 | Asahi Kasei Chemicals Corporation | Light diffusion plate for liquid crystal display |
| EP1950605A4 (en) * | 2005-11-15 | 2008-11-12 | Asahi Kasei Chemicals Corp | Light diffusion plate for liquid crystal display |
| JP2007219456A (en) * | 2006-01-20 | 2007-08-30 | Sumitomo Chemical Co Ltd | Heat-resistant light diffusion plate |
| JP2007309978A (en) * | 2006-05-16 | 2007-11-29 | Teijin Chem Ltd | Direct backlight type liquid crystal display device and light diffusing plate |
| KR101066057B1 (en) | 2006-08-28 | 2011-09-20 | 스미또모 가가꾸 가부시끼가이샤 | Light diffusing plate |
| EP1895332A2 (en) | 2006-08-28 | 2008-03-05 | Sumitomo Chemical Company, Limited | Light Diffusing Plate |
| JP2008122817A (en) * | 2006-11-15 | 2008-05-29 | Dainippon Printing Co Ltd | Optical sheet and surface light source device |
| JP2008292977A (en) * | 2007-04-25 | 2008-12-04 | Sumitomo Chemical Co Ltd | Light diffuser plate |
| JP2009031466A (en) * | 2007-07-26 | 2009-02-12 | Toppan Printing Co Ltd | Optical sheet and display device |
| JP2009103884A (en) * | 2007-10-23 | 2009-05-14 | Goyo Paper Working Co Ltd | Punchable abrasion flaw-resistant double layer lens film |
| US7932967B2 (en) | 2008-03-18 | 2011-04-26 | Sumitomo Chemical Company, Limited | Brightness enhancement film-laminated light diffuser plate and method for producing the same |
| JP2012111138A (en) * | 2010-11-25 | 2012-06-14 | Sumitomo Chemical Co Ltd | Light diffusing laminated resin plate and method for manufacturing the same |
| JP2013086272A (en) * | 2011-10-13 | 2013-05-13 | Sumitomo Chemical Co Ltd | Resin plate, scratch-resistant resin plate using the same, protective plate for display, display window protective plate of portable information terminal, protective plate for touch panel, and method for manufacturing the resin plate |
| CN113267835A (en) * | 2020-01-29 | 2021-08-17 | 住友化学株式会社 | Film roll |
| CN114624922A (en) * | 2022-03-17 | 2022-06-14 | 纳晶科技股份有限公司 | Quantum dot optical plate and light-emitting device comprising same |
| CN114624922B (en) * | 2022-03-17 | 2023-06-23 | 纳晶科技股份有限公司 | Quantum dot optical plate and light-emitting device comprising same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2004170937A (en) | Laminated resin plate | |
| KR100993383B1 (en) | Diffuser prism sheet comprising light diffuser in the valley of prism and LCD back light unit thereby | |
| US20090128738A1 (en) | Light-Transmitting Resin Board | |
| KR20080088047A (en) | Optical prism sheet having a certain roughness thereon | |
| KR20130102105A (en) | Optical diffusion film and liquid crystal display backlight source using the same | |
| KR20080064975A (en) | Light diffusion plate for liquid crystal display | |
| US20060209526A1 (en) | Light diffusion plate | |
| KR100665781B1 (en) | Light diffuser with excellent optical properties and high thermal resistance and anti-moisture absorptivity | |
| KR100994909B1 (en) | Multi-layered light diffusion plate having improved thermal resistance and liguid crystal display containing the same | |
| US20080008845A1 (en) | Light diffusion sheet for a display device | |
| JP2006276838A (en) | Optical diffusion board | |
| JP2007094112A (en) | Diffusing plate | |
| KR101068635B1 (en) | High brightness diffussion film improved engraving proportion and Preparing thereof | |
| JP2006116801A (en) | Laminated resin plate | |
| KR101135245B1 (en) | Plate for enhancing brightness | |
| KR100813738B1 (en) | Light diffuser with excellent scratch resistance and optical properties | |
| KR100813747B1 (en) | Light diffuser with excellent UV durability and optical properties | |
| KR20090116520A (en) | Optical film improved moire | |
| KR100724337B1 (en) | Light diffuser plate for LCD back light unit | |
| KR20070104958A (en) | The plate for brightness enhancement | |
| KR100804061B1 (en) | Diffuser film for high luminance LCD backlight | |
| KR101102008B1 (en) | Diffusion film having diffusing and shielding function and Preparing thereof | |
| KR101102007B1 (en) | Diffusion film improved diffusing and Preparing thereof | |
| KR20140072255A (en) | Light diffusion plate and backlight unit comprising the same | |
| KR100864319B1 (en) | Light diffuser plate for LCD back light unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20061017 |
|
| A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A712 Effective date: 20090401 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20090616 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20091020 |