JP2512544B2 - Light-diffusing synthetic resin - Google Patents
Light-diffusing synthetic resinInfo
- Publication number
- JP2512544B2 JP2512544B2 JP1012736A JP1273689A JP2512544B2 JP 2512544 B2 JP2512544 B2 JP 2512544B2 JP 1012736 A JP1012736 A JP 1012736A JP 1273689 A JP1273689 A JP 1273689A JP 2512544 B2 JP2512544 B2 JP 2512544B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- synthetic resin
- light
- weight
- transparent
- 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.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、光拡散性合成樹脂に関し、より詳しくは照
明カバー、照明看板、ディスプレイ、グレージング等に
好適な光拡散性合成樹脂に関するものである。TECHNICAL FIELD The present invention relates to a light diffusing synthetic resin, and more particularly to a light diffusing synthetic resin suitable for lighting covers, illuminated signboards, displays, glazing and the like. .
（従来の技術） 照明器具、各種ディスプレイ等の成形素材として用い
られる光拡散性合成樹脂に求められる特性としては、高
い光拡散性を有すると共に、電力エネルギーの効率的使
用の点からも高い光線透過性を兼ね備えるということが
望まれており、このような光拡散性合成樹脂としては、
従来より、例えば、（ａ）平均粒径10μ以下の硫酸バリ
ウム、炭酸カルシウム等の無機微粉末を透明樹脂中に含
有せしめたもの（特開昭60−139758号公報）、（ｂ）１
〜10μｍのガラス粉末、石英粉末、フッ化カルシウム等
の無機透明物質粉末、あるいは１〜10μｍのポリスチレ
ン、ポリメタクリレート、アクリル酸エステルの弗化物
の有機透明物質粉末を透明樹脂中に分散せしめたもの
（特公昭60−21662号公報）、（ｃ）４〜50μｍのシリ
カ、ガラス、弗化カルシウム、水酸化アルミニウム等の
透明微粒子を透明樹脂中に分散せしめたもの（特開昭60
−139758号公報、特開昭60−184559号公報および特開昭
61−4762号公報）などが挙げられる。(Prior Art) Light diffusive synthetic resin used as a molding material for lighting fixtures, various displays, etc. has high light diffusivity and high light transmission from the viewpoint of efficient use of power energy. It is desired that the light-diffusing synthetic resin has such properties.
Conventionally, for example, (a) a transparent resin containing an inorganic fine powder such as barium sulfate or calcium carbonate having an average particle size of 10 μ or less (JP-A-60-139758), (b) 1
-10 μm glass powder, quartz powder, calcium fluoride or other inorganic transparent substance powder, or 1-10 μm polystyrene, polymethacrylate, acrylic ester fluoride organic transparent substance powder dispersed in a transparent resin ( (Japanese Patent Publication No. 21662/1985), (c) 4 to 50 μm of transparent fine particles of silica, glass, calcium fluoride, aluminum hydroxide or the like dispersed in a transparent resin (JP-A-60-60).
-139758, JP-A-60-184559, and JP-A-60-184559
61-4762) and the like.
（発明が解決しようとする課題） しかしながら、前記従来の光拡散性合成樹脂では、光
拡散性粉末として無機物質粉末を主に添加含有せしめる
ため、全光線透過率を高くする目的でその粉末の添加量
を減ずるとヘイズ値（曇価）が低下し内部の照明灯が透
けて見えてしまい、一方透けないようにその添加量を増
やしヘイズ値を上げていくと全光線透過率が低下してし
まうという問題点を有すると共に、堅い無機物質的粉末
を使用するため成形機・ノズルやダイ・金型等の摩耗・
損傷が発生しやすく、特に押出成形法により製板する場
合に於いては粉末粒子の粒径が大きいか又は粒径が小さ
くても添加量が多い場合にはこれに起因するダイライン
等の欠点が発生しやすいため事実上長時間の連続運転が
困難であるという問題がある。そのため更に高光拡散性
と高光線透過率を有する光拡散性樹脂の出現を切望する
市場ニーズには実用上十分に対応できていないのが実情
である。(Problems to be Solved by the Invention) However, in the conventional light diffusing synthetic resin, an inorganic substance powder is mainly added and contained as a light diffusing powder, and therefore the addition of the powder is added for the purpose of increasing the total light transmittance. If the amount is reduced, the haze value (cloudiness value) will decrease and the internal lighting will be transparent, while on the other hand, if the amount of addition is increased and the haze value is increased so as not to be transparent, the total light transmittance will decrease. In addition to the problem that the hard inorganic material powder is used, wear of the molding machine, nozzle, die, mold, etc.
Damage is likely to occur, especially in the case of plate making by extrusion molding method, if the particle size of the powder particles is large, or if the addition amount is large even if the particle size is small, there are drawbacks such as die lines due to this. Since it easily occurs, there is a problem that continuous operation for a long time is practically difficult. Therefore, in reality, it is not practically sufficient to meet the market needs for the advent of a light diffusing resin having higher light diffusivity and higher light transmittance.
したがって、本発明の目的は、実用生産性に適した、
高い光拡散性と高光線透過率を有する光拡散性合成樹脂
を提供することにある。Therefore, the object of the present invention is suitable for practical productivity,
An object of the present invention is to provide a light diffusing synthetic resin having a high light diffusing property and a high light transmittance.
（課題を解決するための手段） 本発明者等は、前記課題を解決すべく光拡散剤の種類
について鋭意研究を進めた結果、特定粒子径を有するシ
リコーン樹脂微粒子および特定粒子径を有する無機透明
物質粉末を透明合成樹脂中に含有せしめることにより、
これまでにない高い光拡散性と高光線透過率を与えると
いうことを見出し、本発明を完成した。(Means for Solving the Problems) The inventors of the present invention have conducted earnest research on the type of the light diffusing agent in order to solve the above problems, and as a result, silicone resin fine particles having a specific particle diameter and an inorganic transparent material having a specific particle diameter have been obtained. By including the substance powder in the transparent synthetic resin,
The present invention has been completed based on the finding that it provides unprecedented high light diffusivity and high light transmittance.
すなわち、本発明の要旨とするところは、透明合成樹
脂中に平均粒子径１〜６μｍのシリコーン樹脂微粒子を
樹脂100重量部に対して５重量部以下の量及び平均粒子
径１〜７μｍの無機透明物質粉末を樹脂100重量部に対
して２重量部以下の量分散せしめてなる光拡散性合成樹
脂である。That is, the gist of the present invention is that silicone resin fine particles having an average particle size of 1 to 6 μm are contained in a transparent synthetic resin in an amount of 5 parts by weight or less with respect to 100 parts by weight of a resin and an inorganic transparent material having an average particle size of 1 to 7 μm. It is a light-diffusing synthetic resin in which a substance powder is dispersed in an amount of 2 parts by weight or less based on 100 parts by weight of the resin.
以下本発明を具体的に説明する。 Hereinafter, the present invention will be described specifically.
本発明に用いられる透明合成樹脂としては、特に限定
はないが、例えばメタクリル樹脂、スチレン樹脂、ポリ
カーポネート樹脂等が挙げられ、特に光線透過率の高い
メタクリル酸メチルを主成分とするメタクリル樹脂が好
ましく用いられる。The transparent synthetic resin used in the present invention is not particularly limited, and examples thereof include a methacrylic resin, a styrene resin, a polycarbonate resin, and the like, and a methacrylic resin containing methyl methacrylate as a main component with a high light transmittance is particularly preferable. It is preferably used.
本発明に用いるシリコーン樹脂微粒子とは、Building
−up processで製造される三官能性単位からなるポリメ
チルシルセスキオキサンなどのシリコーンレジンの微粒
子であり、緻密なシロキサン結合を形成しすでに硬化し
た溶剤不溶、熱不融の高分子微粒子をいい、その平均粒
子径（重量平均粒子径）は１〜６μｍ、好ましくは２〜
４μｍであり、またその形状は不定形であるよりも真球
状である方がヘイズ値が高くなり、透けが生じにくいの
で好ましい。前記微粒子の平均粒子径が１μｍより小さ
い場合には光が通過する時に透過波長の選択が生じるた
め透過光は赤味を帯びるため好ましくなく、一方６μｍ
を超える場合には透けが生じやすくなり、高い光拡散性
及び高光線透過率の性質を合せ持つことができなくなる
傾向が見られ好ましくない。The silicone resin fine particles used in the present invention means Building
A fine particle of silicone resin such as polymethylsilsesquioxane composed of trifunctional units produced by the -up process, which is a solvent-insoluble and heat-insoluble polymer fine particle that has already formed a dense siloxane bond and has already been cured. , Its average particle diameter (weight average particle diameter) is 1 to 6 μm, preferably 2 to
It is 4 μm, and the shape is preferably spherical rather than amorphous because the haze value is higher and the transparency is less likely to occur. When the average particle diameter of the fine particles is smaller than 1 μm, the transmission wavelength is selected when light passes therethrough, which is not preferable because the transmitted light becomes reddish.
If it exceeds the range, it is not preferable because it is likely to show transparency, and it tends to be impossible to combine the properties of high light diffusivity and high light transmittance.
内部の照明灯が見えない、すなわち透けない等という
実用性能からみて、光拡散性樹脂であると云えるには、
少なくともヘイズ値が約90％以上、好ましくは92％以上
なければならないから、従来の硫酸バリウム（３μ
ｍ）、炭酸カルシウム（５μｍ）、ガラスビーズ（３μ
ｍ）を添加含有せしめた樹脂系では、表面を艶消状とし
表面散乱をさせない限りせいぜい65〜75％程度の全光線
透過率を得るにすぎない。From the practical performance that the internal lighting cannot be seen, that is, it cannot be seen, it can be said that it is a light diffusing resin.
Since the haze value must be at least about 90% or more, preferably 92% or more, conventional barium sulfate (3 μm
m), calcium carbonate (5 μm), glass beads (3 μm
In the case of a resin system containing m), the total light transmittance of about 65 to 75% is obtained at most, unless the surface is made matte and the surface is not scattered.
これに対し本発明の光拡散性合成樹脂は、前記したよ
うに、透明合成樹脂中に平均粒子径が１〜６μｍのシリ
コーン樹脂微粒子および１〜７μｍの無機透明物質粉末
を分散せしめてなるものであるから、全光線透過率が80
〜82％程度であってもヘイズ値が93〜94％程度あり透け
ることがなく、高い光拡散性と高光透過性を示す光沢の
ある美麗な光拡散性合成樹脂を得ることができる。On the other hand, the light-diffusing synthetic resin of the present invention, as described above, is obtained by dispersing the silicone resin fine particles having an average particle diameter of 1 to 6 μm and the inorganic transparent substance powder having an average particle diameter of 1 to 7 μm in the transparent synthetic resin. Therefore, the total light transmittance is 80
Even if it is about 82%, it has a haze value of about 93 to 94%, does not show transparency, and a beautiful glossy light-diffusing synthetic resin exhibiting high light-diffusing property and high light-transmitting property can be obtained.
本発明で用いられる前記シリコーン樹脂微粒子の添加
量は、成形品表面の膚荒れを起さないこと、耐衝撃強さ
が実用上不都合なほど低下しないこと、真空成形等の二
次加工が容易にできること、経済性などを考慮すると樹
脂100重量部に対して５重量部以下であり、板厚を考慮
すると６〜40g/m2、好ましくは８〜30g/m2であることが
望ましい。The addition amount of the silicone resin fine particles used in the present invention is such that the surface of the molded product does not become rough, the impact strength does not decrease practically, and secondary processing such as vacuum molding is easy. It is desirable that the amount is 5 parts by weight or less with respect to 100 parts by weight of the resin in consideration of what can be done and economy, and in consideration of the plate thickness, it is 6 to 40 g / m 2 , preferably 8 to 30 g / m 2 .
また本発明に用いれらる無機透明物質粉末は、光拡散
性合成樹脂の特に反射光における白さを向上させる目的
で含有させるものであり、硫酸バリウム、炭酸カルシウ
ム等が好ましく用いられる。この粉末の平均粒子径は１
〜７μｍ、好ましくは２〜５μｍであり、その添加量は
樹脂100重量部に対して２重量部以下、好ましくは、0.3
〜１重量部であり、前記シリコーン樹脂微粒子の添加量
より少ないことが望ましい。The inorganic transparent substance powder used in the present invention is contained for the purpose of improving the whiteness of the light diffusing synthetic resin, especially in reflected light, and barium sulfate, calcium carbonate and the like are preferably used. The average particle size of this powder is 1
To 7 μm, preferably 2 to 5 μm, and the addition amount is 2 parts by weight or less, preferably 0.3 parts by weight, relative to 100 parts by weight of the resin.
It is desirable to be 1 part by weight and less than the addition amount of the silicone resin fine particles.
以上のように本葉鵜名の光拡散性合成樹脂は、照明カ
バー、照明看板、ディスプレイ、グレージング等の成形
素材として好適であり、射出成形あるいは押出成形など
により、前記照明器具、各種ディスプレイ及びグレージ
ング製品を製造することができる。As described above, the light diffusing synthetic resin of Honha Una is suitable as a molding material for lighting covers, lighting signboards, displays, glazing and the like, and the lighting fixtures, various displays and glazing can be obtained by injection molding or extrusion molding. The product can be manufactured.
（実施例） 以下実施例により、本発明をより詳細に説明する。(Example) Hereinafter, the present invention will be described in more detail with reference to Examples.
本実施例において、「全光線透過率」及び「ヘイズ
値」はJIS K6717に準拠して積分球式光線透過率測定装
置（（株）村上色彩技術研究所製;RM−15）により測定
した値であり、「白色度」は色差計（スガ試験機KK製;S
M−２）によりL,a,b系白色度を測定した値である。ま
た、光拡散性の目視判定である透けの確認は、10Wの直
管蛍光灯の前方8cmの位置に試料片を平行に置き、更に
前記試料片から1m離れた位置で試料板を通して蛍光灯の
輪郭が見えるかどうか目視観察し、次に記号によりその
状態を示したものである。In this example, "total light transmittance" and "haze value" are values measured by an integrating sphere light transmittance measuring device (manufactured by Murakami Color Research Laboratory; RM-15) in accordance with JIS K6717. "Whiteness" is a color difference meter (Suga Testing Machine KK; S
It is a value obtained by measuring the whiteness of L, a, and b systems according to M-2). Further, the confirmation of the see-through which is a visual judgment of the light diffusivity is performed by placing the sample piece in parallel at a position 8 cm in front of the straight tube fluorescent lamp of 10 W, and further passing the sample of the fluorescent lamp through the sample plate at a position 1 m away from the sample piece. Visual observation is made to see if the contour is visible, and then the state is indicated by symbols.
○ 蛍光灯の輪郭は認められない。○ The outline of the fluorescent lamp is not recognized.
△ 蛍光灯の輪郭がかすかに認められる。△ The outline of the fluorescent lamp is faintly recognized.
× 蛍光灯の輪郭が明瞭に認められる。× The outline of the fluorescent lamp is clearly visible.
また本実施例中の粒子径とは重量平均粒子径を意味
し、粒度分布測定機（（株）セイシン企業製;SKA−500
0）により測定した値を示す。In addition, the particle size in this example means a weight average particle size, and a particle size distribution analyzer (manufactured by Seishin Enterprise Co., Ltd .; SKA-500).
The value measured by 0) is shown.
参考例１〜３ アクリル酸メチル５％含有し、分子量が160,000のメ
タアクリル酸メチル共重合体であるメタクリル樹脂100
重量部に対し、粒子径2.3μｍの真球状シリコーン樹脂
微粒子を各種添加量を変えて配合・撹拌し、単軸押出機
により10kg/Hの速度で混練溶融押出しダイでシート状に
した後ポリシングロールで露出・冷却し、厚さ１〜3mm
の外観良好な平板成形品を得た。これらの成形品の性能
評価結果を第１表に示すが、全光線透過率86％、ヘイズ
値94％で透けのない光拡散性樹脂板が得られた。Reference Examples 1 to 3 Methacrylic resin 100 containing 5% methyl acrylate and having a molecular weight of 160,000, which is a methyl methacrylate copolymer.
The spherical silicone resin fine particles having a particle diameter of 2.3 μm are mixed and stirred by varying the addition amount with respect to parts by weight, kneaded by a single-screw extruder at a speed of 10 kg / H, melted into a sheet with a die, and then polished. Exposed and cooled with a thickness of 1 to 3 mm
A flat plate molded product having a good appearance was obtained. The performance evaluation results of these molded products are shown in Table 1. A transparent light-diffusing resin plate having a total light transmittance of 86% and a haze value of 94% was obtained.
参考例４〜６ 粒子径3.6μｍの真球状シリコーン樹脂微粒子（東芝
シリコーン（株）；トスパール130）を使用する以外は
参考例１〜３と同様にして外観良好な平板成形品を得
た。これらの成形品の性能評価結果を第１表に合せて示
すが、この結果から全光線透過率86％でも透けない光拡
散性樹脂板が得られることがわかった。Reference Examples 4 to 6 Flat-plate molded articles with good appearance were obtained in the same manner as in Reference Examples 1 to 3 except that true spherical silicone resin fine particles having a particle diameter of 3.6 μm (Toshiba Silicone Co., Ltd .; Tospearl 130) were used. The performance evaluation results of these molded products are also shown in Table 1. From these results, it was found that a light-diffusing resin plate that does not penetrate even with a total light transmittance of 86% can be obtained.
参考例7,8 粒子径5.9μｍの不定形シリコーン樹脂微粒子を使用
する以外は参考例１〜３と同様にして外観良好な平板成
形品を得た。これらの性能評価結果を第１表に合せて示
すが、この結果から真球状のシリコーン樹脂微粒子の結
果より良くないものの、従来の拡散性樹脂板に比較する
と格段の性能向上が見られた。Reference Examples 7 and 8 A flat plate molded article having a good appearance was obtained in the same manner as in Reference Examples 1 to 3 except that amorphous silicone resin fine particles having a particle diameter of 5.9 μm were used. The results of these performance evaluations are also shown in Table 1. From these results, although not as good as the results of the true spherical silicone resin fine particles, the performance was remarkably improved as compared with the conventional diffusible resin plate.
実施例１〜３ 粒子径3.6μｍの真球状シリコーン樹脂微粒子と粒子
径３μｍの硫酸バリウム、および粒子径5.9の不定形シ
リコーン樹脂微粒子と粒子径５μｍの炭酸カルシウムの
それぞれの混合物を使用する以外は参考例１〜３と同様
にして外観良好な平板成形品を得た。これらの性能評価
結果を第１表に合せて示すが、この結果から全光線透過
率をあまり低下させることなく白色度が向上できること
がわかった。Examples 1 to 3 Reference is made except that a mixture of spherical silicone resin fine particles having a particle diameter of 3.6 μm, barium sulfate having a particle diameter of 3 μm, and amorphous silicone resin fine particles having a particle diameter of 5.9 and calcium carbonate having a particle diameter of 5 μm is used. Flat plate molded products with good appearance were obtained in the same manner as in Examples 1 to 3. The results of these performance evaluations are also shown in Table 1. From these results, it was found that the whiteness can be improved without significantly reducing the total light transmittance.
比較例１〜３ 粒子径３μｍの沈降性硫酸バリウムを使用する以外は
参考例１〜３と同様にして平板成形品を得た。これらの
性能評価結果を第１表に示すが硫酸バリウムの添加量を
増加していくとダイラインという外観欠点が出やすい傾
向が見られた。Comparative Examples 1 to 3 Flat plate molded products were obtained in the same manner as in Reference Examples 1 to 3 except that precipitated barium sulfate having a particle diameter of 3 µm was used. The results of these performance evaluations are shown in Table 1, but there was a tendency that appearance defects such as die lines tended to occur as the amount of barium sulfate added was increased.
比較例４〜６ 粒子径５μｍの炭酸カルシウムを使用する以外は参考
例１〜３と同様にして平板成形品を得た。これらの性能
評価結果を第１表に示すが、添加量が少ない時でもダイ
ラインが出やすい傾向が見られた。Comparative Examples 4 to 6 Flat plate molded products were obtained in the same manner as in Reference Examples 1 to 3 except that calcium carbonate having a particle diameter of 5 μm was used. The results of these performance evaluations are shown in Table 1, and there was a tendency that the die line was likely to appear even when the addition amount was small.
（発明の効果） 以上述べたように、本発明の光拡散性合成樹脂は、透
明合成樹脂中に平均粒子径１〜６μｍのシリコーン樹脂
微粒子および１〜７μｍの無機透明物質粉末を分散せし
めてなる合成樹脂であるから、無機透明物質粉末の添加
量により白色度が調節できるので、反射光においても白
さを有し、高い光拡散性と高い光線透過率を持つ光拡散
性合成樹脂であり、照明カバー、照明看板、ディスプレ
イ、グレージング等の成形素材して、およびその成形品
の供給において好適である。 (Effect of the Invention) As described above, the light diffusing synthetic resin of the present invention is obtained by dispersing silicone resin fine particles having an average particle diameter of 1 to 6 μm and inorganic transparent substance powder of 1 to 7 μm in a transparent synthetic resin. Since it is a synthetic resin, since the whiteness can be adjusted by the addition amount of the inorganic transparent substance powder, it has whiteness even in reflected light, and is a light diffusing synthetic resin having high light diffusivity and high light transmittance, It is suitable for use as a molding material for lighting covers, illuminated signboards, displays, glazing, etc., and for supplying molded products thereof.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 阿部 研 新潟県北蒲原郡中条町協和町４番７号 協和ガス化学工業株式会社中条工場内 審査官 谷口 浩行 (56)参考文献 特開 平１−172801（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ken Abe Ken No. 4-7 Kyowa-cho, Nakajo-machi, Kita-Kabahara-gun, Niigata Prefecture Kyowa Gas Chemicals Co., Ltd. Nakajo Plant Examiner Hiroyuki Taniguchi (56) References 172801 (JP, A)
Claims (2)
のシリコーン樹脂微粒子を樹脂100重量部に対して５重
量部以下の量および平均粒子径１〜７μｍの無機透明物
質粉末を樹脂100重量部に対して２重量部以下の量分散
せしめてなることを特徴とする光拡散性合成樹脂。1. An average particle size of 1 to 6 μm in a transparent synthetic resin.
5 parts by weight or less of the silicone resin fine particles of 100 parts by weight of the resin and 2 parts by weight or less of the inorganic transparent substance powder having an average particle diameter of 1 to 7 μm are dispersed in 100 parts by weight of the resin. Characteristic light diffusive synthetic resin.
求項１記載の光拡散性合成樹脂。2. The light diffusing synthetic resin according to claim 1, wherein the transparent synthetic resin is a methacrylic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1012736A JP2512544B2 (en) | 1989-01-21 | 1989-01-21 | Light-diffusing synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1012736A JP2512544B2 (en) | 1989-01-21 | 1989-01-21 | Light-diffusing synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02194058A JPH02194058A (en) | 1990-07-31 |
| JP2512544B2 true JP2512544B2 (en) | 1996-07-03 |
Family
ID=11813719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1012736A Expired - Lifetime JP2512544B2 (en) | 1989-01-21 | 1989-01-21 | Light-diffusing synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2512544B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7754325B2 (en) | 2006-01-31 | 2010-07-13 | Ps Japan Corporation | Rubber-modified styrene-based resin and light diffusion plate containing such resin |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4326521B4 (en) * | 1992-08-10 | 2005-12-22 | Bridgestone Corp. | Light scattering material and method for its production |
| CA2219855C (en) * | 1996-11-12 | 2007-01-23 | Rohm And Haas Company | Flexible light pipe for side-lit applications |
| EP1152286A4 (en) | 1998-12-18 | 2002-05-15 | Mitsubishi Rayon Co | Transmission screen |
| DE10323789A1 (en) * | 2003-05-23 | 2004-12-09 | Röhm GmbH & Co. KG | Shaped body for light advertising and process for its preparation |
| US20090128738A1 (en) | 2005-10-26 | 2009-05-21 | Asahi Kasei Chemicals Corporation | Light-Transmitting Resin Board |
| KR101045558B1 (en) * | 2007-09-11 | 2011-07-01 | 디아이씨 가부시끼가이샤 | Resin composition for light-diffusion plate, light-diffusion plate, and its manufacturing method |
| JP5287081B2 (en) * | 2008-09-24 | 2013-09-11 | 住友化学株式会社 | Light diffusion plate for LED light source |
| KR20120135007A (en) | 2010-03-31 | 2012-12-12 | 다케모토 유시 가부시키 가이샤 | Light-diffusing resin composition and light-diffusing molded article |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63291001A (en) * | 1987-05-25 | 1988-11-28 | Asahi Chem Ind Co Ltd | Light diffusion plate for transmission type screen |
| JPS63300229A (en) * | 1987-05-29 | 1988-12-07 | Asahi Chem Ind Co Ltd | Transmissive screen |
| JPH01172801A (en) * | 1987-12-28 | 1989-07-07 | Asahi Chem Ind Co Ltd | Light diffusion plate having light transmittability |
| JPH01269902A (en) * | 1988-04-21 | 1989-10-27 | Asahi Chem Ind Co Ltd | Light diffusion plate for transmission type screen |
-
1989
- 1989-01-21 JP JP1012736A patent/JP2512544B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7754325B2 (en) | 2006-01-31 | 2010-07-13 | Ps Japan Corporation | Rubber-modified styrene-based resin and light diffusion plate containing such resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02194058A (en) | 1990-07-31 |
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