JPH1160966A - Light diffusing resin composition - Google Patents
Light diffusing resin compositionInfo
- Publication number
- JPH1160966A JPH1160966A JP9227559A JP22755997A JPH1160966A JP H1160966 A JPH1160966 A JP H1160966A JP 9227559 A JP9227559 A JP 9227559A JP 22755997 A JP22755997 A JP 22755997A JP H1160966 A JPH1160966 A JP H1160966A
- Authority
- JP
- Japan
- Prior art keywords
- fine particles
- resin fine
- particle diameter
- average particle
- weight
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光拡散性樹脂組成
物に関し、より詳しくは照明カバー、照明看板、ディス
プレー、グレージング等に適した光拡散性樹脂組成物に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffusing resin composition, and more particularly to a light diffusing resin composition suitable for lighting covers, lighting signs, displays, glazings and the like.
【０００２】[0002]
【従来の技術】光拡散性を有する合成樹脂は、照明器
具、各種ディスプレー等にまたはその成形素材などに用
いられており、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ともに、電力エネルギー
の効率的使用の点から高い光線透過性を兼ね備えるとい
うことがますます要求されている。このような光拡散性
合成樹脂としては、例えば（ａ）平均粒径１０μｍ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
合成樹脂中に含有せしめたもの（特開昭６０−１３９７
５８号公報）、（ｂ）平均粒径１〜１０μｍのガラス粉
末、石英粉末、フッ化カルシウム粉末等の無機透明物質
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フッ化物の有機透明
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）平均粒径４〜５０μｍの
シリカ、ガラス、フッ化カルシウム、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６０−１８４５
５９号公報、特開昭６１−４７６２号公報）、（ｄ）平
均粒径０．５〜５μｍのスチレン系架橋重合体微粒子を
含有せしめたもの（特公昭３９−１０５１５号公報）、
スチレン系樹脂または粒子径３０〜５００μｍの架橋し
たスチレン−アルキルアクリレート系ポリマーをアクリ
ル樹脂に混合分散せしめたもの（特開昭５６−３６５３
５号公報、特開昭６１−１５９４０号公報）、および平
均粒子径１〜３０μｍの架橋スチレン系ポリマー１〜２
０重量部を含有させたもの（特開平４−１８３４６号公
報）、（ｅ）平均粒径１〜６μｍのシリコーン樹脂微粒
子および平均粒径１〜７μｍの無機透明物質粉末を分散
せしめたもの（特許第２５１２５４４号公報）などが挙
げられる。2. Description of the Related Art Light-diffusing synthetic resins are used for lighting fixtures, various displays and the like, or as molding materials thereof. The properties required for light-diffusing synthetic resins include high light-diffusing properties. At the same time, it is increasingly required to have high light transmittance in terms of efficient use of electric energy. As such a light diffusing synthetic resin, for example, (a) a transparent synthetic resin containing an inorganic fine powder such as barium sulfate or calcium carbonate having an average particle diameter of 10 μm or less (Japanese Patent Application Laid-Open No. 60-1397)
No. 58), (b) Inorganic transparent substance powders such as glass powder, quartz powder and calcium fluoride powder having an average particle diameter of 1 to 10 μm, or 1 to 10 μm of polystyrene, polymethacrylate, and fluorinated acrylate organic. Transparent substance powder dispersed in transparent resin (Japanese Patent Publication Sho 60
Japanese Patent Application Laid-Open No. Sho 60-139758), (c) transparent fine particles such as silica, glass, calcium fluoride, and aluminum hydroxide having an average particle size of 4 to 50 μm dispersed in a transparent resin. JP-A-60-1845
No. 59, JP-A-61-4762), (d) those containing styrene-based crosslinked polymer fine particles having an average particle size of 0.5 to 5 μm (JP-B-39-10515).
A styrene resin or a crosslinked styrene-alkyl acrylate polymer having a particle diameter of 30 to 500 μm mixed and dispersed in an acrylic resin (JP-A-56-3653).
No. 5, JP-A-61-15940), and a crosslinked styrene-based polymer having an average particle diameter of 1 to 30 μm.
(E) Silicone fine particles having an average particle size of 1 to 6 μm and an inorganic transparent substance powder having an average particle size of 1 to 7 μm are dispersed (Patent Document 1). No. 251544).
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記
（ａ）〜（ｃ）の場合には、光拡散性微粒子として無機
物質粉末を主に添加しているため、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）が低下してしまい内部の照明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加させると、全
光線透過率が低下してしまうという問題点があった。ま
た、これらの場合には、使用する無機粉末の硬さに起因
した設備機器の摩耗損傷などの発生、および押出板製造
時のダイラインなどの欠点発生という問題もあった。ま
た、上記（ｄ）〜（ｅ）では、粒子径の小さいスチレン
系架橋樹脂微粒子やシリコーン樹脂微粒子等の架橋樹脂
微粒子を用いる場合には、無機物質粉末等に比べ光拡散
性に優れ設備上の問題等が解消されるものの、内部の光
源が透けないようにするには添加量を増加させねばなら
ず、市場の要求に応えてさらに高い光線透過率と隠蔽性
を両立させることは容易ではなく、一方粒子径の大きい
架橋樹脂微粒子を用いる場合には、高い光線透過率は実
現できるものの、市場の要求に応えてさらに良好な光拡
散性能と隠蔽性とを得ることは容易ではないという問題
があった。このような状況から、さらに高い光拡散性と
高い光線透過率を有する光拡散性合成樹脂を必要とする
市場ニーズには十分対応しがたいというのが実情であっ
た。したがって、本発明の目的は、生産性に優れた、よ
り高い光拡散性と高い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。However, in the cases (a) to (c), since the inorganic substance powder is mainly added as the light diffusing fine particles, the purpose is to increase the total light transmittance. If the addition amount of the powder is reduced, the haze value (haze value) decreases and the internal lighting becomes transparent, while if the addition amount is increased so as not to be transparent, the total light transmittance decreases. There was a problem that would. In these cases, there are also problems such as the occurrence of wear damage to equipment and the like due to the hardness of the inorganic powder used, and the occurrence of defects such as die lines at the time of manufacturing an extruded plate. In the above (d) to (e), when crosslinked resin fine particles such as styrene-based crosslinked resin fine particles or silicone resin fine particles having a small particle diameter are used, the light diffusion property is superior to that of inorganic substance powder or the like, and the equipment is difficult to use. Although the problems are solved, the amount of addition must be increased to prevent the internal light source from being transparent, and it is not easy to achieve both higher light transmittance and concealment in response to market demands. On the other hand, when a crosslinked resin fine particle having a large particle diameter is used, a high light transmittance can be realized, but it is not easy to obtain more favorable light diffusion performance and concealment in response to market requirements. there were. Under such circumstances, it has been a reality that it is difficult to sufficiently respond to market needs that require a light-diffusing synthetic resin having a higher light-diffusing property and a higher light transmittance. Accordingly, an object of the present invention is to provide a light-diffusing synthetic resin having excellent light-diffusing property and high light transmittance, which is excellent in productivity.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記課題
を解決すべく鋭意検討した結果、特定範囲の粒子径を有
する２種類のシリコーン樹脂微粒子、あるいはスチレン
系架橋樹脂微粒子を透明合成樹脂中に分散させることに
より、これまでにない高い拡散性能と高い光線透過率を
発現させることができることを見出し、本発明を完成す
るに至った。すなわち、上記目的は本発明によれば、透
明樹脂１００重量部に、平均粒子径５μｍ未満の架橋樹
脂微粒子を５重量部以下の量および平均粒子径５〜１０
μｍの架橋樹脂微粒子を５重量部以下の量それぞれ分散
せしめてなる光拡散性樹脂組成物、および透明樹脂１０
０重量部に、平均粒子径５μｍ未満の架橋樹脂微粒子を
５重量部以下の量、平均粒子径５〜１０μｍの架橋樹脂
微粒子を５重量部以下の量および無機透明物質粉末を５
重量部以下の量それぞれ分散せしめてなる光拡散性樹脂
組成物によって達成することができる。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, it has been found that two types of silicone resin fine particles having a specific range of particle diameter or styrene-based crosslinked resin fine particles can be used as transparent synthetic resin. It has been found that by dispersing it in the medium, it is possible to express unprecedentedly high diffusion performance and high light transmittance, and thus have completed the present invention. That is, according to the present invention, the object is to provide a crosslinked resin fine particle having an average particle diameter of less than 5 μm in an amount of 5 parts by weight or less and an average particle diameter of 5 to 10 parts by weight in 100 parts by weight of a transparent resin.
a light-diffusing resin composition obtained by dispersing crosslinked resin fine particles of 5 μm in an amount of 5 parts by weight or less;
0 parts by weight, 5 parts by weight or less of crosslinked resin fine particles having an average particle diameter of less than 5 μm, 5 parts by weight or less of crosslinked resin fine particles having an average particle diameter of 5 to 10 μm, and 5 parts by weight of inorganic transparent material powder.
This can be achieved by a light diffusing resin composition which is dispersed in an amount of not more than part by weight.
【０００５】[0005]
【発明の実施の形態】以下、本発明を具体的に説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below.
【０００６】本発明に用いる樹脂としては、透明性を有
するものであれば特に制限はなく、例えば、メタクリル
系樹脂、スチレン系樹脂、ポリカーボネート系樹脂等が
挙げられる。これらの樹脂中、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系樹脂が好まし
く用いられる。[0006] The resin used in the present invention is not particularly limited as long as it has transparency, and examples thereof include methacrylic resins, styrene resins, and polycarbonate resins. Among these resins, a methacrylic resin containing methyl methacrylate having high light transmittance as a main component is preferably used.
【０００７】本発明に用いる架橋樹脂微粒子としては、
上記樹脂を構成するモノマー中に添加して重合する際、
または上記樹脂中に溶融混合する際などに粒子形状を保
持できるものであれば特に限定されず、例えばシリコー
ン樹脂微粒子、スチレン系架橋樹脂微粒子、アクリル系
架橋樹脂微粒子、ゴム弾性層を有するコア・シェル型樹
脂微粒子などが挙げられる。これらの樹脂微粒子のうち
で、光拡散性の点でシリコーン樹脂微粒子、スチレン系
架橋樹脂微粒子、またはこれら２種類の樹脂微粒子の等
量混合物を用いることが好ましい。The crosslinked resin particles used in the present invention include:
When polymerizing by adding to the monomer constituting the resin,
The resin is not particularly limited as long as it can maintain the particle shape when melt-mixed in the resin, and examples thereof include silicone resin fine particles, styrene crosslinked resin fine particles, acrylic crosslinked resin fine particles, and a core / shell having a rubber elastic layer. And fine resin particles. Among these resin fine particles, it is preferable to use silicone resin fine particles, styrene-based crosslinked resin fine particles, or an equivalent mixture of these two types of resin fine particles from the viewpoint of light diffusibility.
【０００８】上記シリコーン樹脂微粒子の例としては、
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、溶剤に不溶で熱にも溶解しない高分子
微粒子が挙げられる。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、光源の形状が透
けてみえる、いわゆる「透け」現象が生じにくいので好
ましい。Examples of the above silicone resin fine particles include:
Silicone resin microparticles such as polymethylsilsesquioxane composed of trifunctional units manufactured by building-up process, which form dense siloxane bonds, are insoluble in solvents and are not soluble in heat. No. It is preferable that the shape of the light source be a true sphere rather than an amorphous shape because the haze value becomes higher and a so-called “transparency” phenomenon in which the shape of the light source can be seen through hardly occurs.
【０００９】また、上記スチレン系架橋樹脂微粒子の例
としては、スチレン系モノマー、架橋性モノマーおよび
必要により他のモノマーを懸濁重合して得られる微粒子
が挙げられる。スチレン系架橋樹脂微粒子は、透明樹脂
と混合し、溶融押出してもほとんど溶解することがな
く、原形の球状を保持していることが好ましい。また、
スチレン系架橋樹脂微粒子の耐候性を改良する目的で、
樹脂中にベンゾトリアゾール系、ヒンダードアミン系、
ベンゾフェノン系、サリチル酸エステル系等の光安定剤
を添加することもできる。Examples of the styrene-based crosslinked resin fine particles include fine particles obtained by suspension-polymerizing a styrene-based monomer, a crosslinkable monomer and, if necessary, other monomers. It is preferable that the styrene-based crosslinked resin fine particles hardly dissolve even when mixed with a transparent resin and melt-extruded, and retain the original spherical shape. Also,
In order to improve the weather resistance of the styrene-based crosslinked resin fine particles,
Benzotriazole, hindered amine,
A light stabilizer such as a benzophenone type or a salicylic acid ester type may be added.
【００１０】スチレン系モノマーとしては、通常スチレ
ン、α−メチルスチレン、ハロゲン化スチレン等を用い
ることが可能であるが、スチレンが好ましく用いられ
る。スチレン系モノマーの使用量は通常５０〜９９重量
％、好ましくは８０〜９５重量％の範囲である。また、
架橋性モノマーとしては、分子内に２個以上の不飽和結
合を持つ化合物が用いられ、その具体例としては、エチ
レングリコールジメタクリレート、１，４−ブタンジオ
ールメタクリレート、ネオペンチルグリコールなどの二
官能性ジメタクリレート；ジビニルベンゼン等の多価ビ
ニルベンゼン等を好ましく挙げることができる。架橋性
モノマーの使用量は、通常１〜５０重量％、好ましくは
５〜２０重量％の範囲である。また、必要により用いる
他のモノマーとしては、特に限定されずスチレン系モノ
マーおよび架橋性モノマーと重合しうるものであればよ
く、またその使用量についても本発明の目的に支障のな
い範囲であれば差し支えない。As the styrene monomer, styrene, α-methylstyrene, halogenated styrene and the like can be usually used, but styrene is preferably used. The amount of the styrene monomer used is usually in the range of 50 to 99% by weight, preferably 80 to 95% by weight. Also,
As the crosslinkable monomer, a compound having two or more unsaturated bonds in a molecule is used, and specific examples thereof include bifunctional compounds such as ethylene glycol dimethacrylate, 1,4-butanediol methacrylate, and neopentyl glycol. Dimethacrylate; polyvalent vinyl benzene such as divinyl benzene and the like can be preferably mentioned. The amount of the crosslinkable monomer used is usually in the range of 1 to 50% by weight, preferably 5 to 20% by weight. The other monomer used as necessary is not particularly limited as long as it can be polymerized with a styrene-based monomer and a crosslinkable monomer, and the amount of use thereof is also within a range that does not interfere with the object of the present invention. No problem.
【００１１】本発明の光拡散性樹脂組成物は、透明樹脂
中に、特定範囲の粒子径を有する２種類の架橋樹脂微粒
子、すなわち、平均粒子径５μｍ未満、好ましくは０．
１〜３μｍの架橋樹脂微粒子と平均粒子径５〜１０μ
ｍ、好ましくは５〜８μｍの架橋樹脂微粒子を分散せし
めることが必要である。平均粒子径が５μｍ未満の架橋
樹脂微粒子は、光拡散性にも寄与するが主として樹脂に
隠蔽性を付与し、照明カバー等の用途に用いた際の蛍光
灯などの光源が透けて見えることを防止する役割を担
う。一方、平均粒子径が５〜１０μｍの架橋樹脂微粒子
は、樹脂の光線透過率を保持したまま、高い拡散性を与
えることができる。平均粒子径が５μｍ未満の架橋樹脂
微粒子のみを使用した場合には、隠蔽性に優れるもの
の、所望の光拡散性とするには樹脂微粒子の添加量を多
くする必要があるため光線透過率が低くなるため好まし
くない。また樹脂中に粒子径が小さいものの混入割合が
多くなるため、照明器具などとして使用した場合には、
その透過光が赤みを帯びてしまうため好ましくない。一
方、平均粒子径が５μｍ以上の架橋樹脂微粒子のみを使
用した場合には、光線透過率は高いが、隠蔽性が不十分
であり、照明器具などとして使用した際の蛍光灯など光
源の透けを防止するためには添加量を多くする必要があ
り経済的にも好ましくない。The light-diffusing resin composition of the present invention contains two kinds of crosslinked resin fine particles having a specific range of particle diameter in a transparent resin, that is, an average particle diameter of less than 5 μm, preferably 0.1 μm.
1-3 μm crosslinked resin fine particles and average particle size 5-10 μm
m, preferably 5 to 8 μm, is required to be dispersed. Crosslinked resin fine particles having an average particle diameter of less than 5 μm contribute to light diffusivity but mainly impart concealment to the resin, so that light sources such as fluorescent lamps can be seen through when used in applications such as lighting covers. Play a role to prevent. On the other hand, the crosslinked resin fine particles having an average particle diameter of 5 to 10 μm can provide high diffusivity while maintaining the light transmittance of the resin. When only the crosslinked resin fine particles having an average particle diameter of less than 5 μm are used, the opacity is excellent, but the light transmittance is low because it is necessary to increase the amount of the resin fine particles to obtain the desired light diffusing property. Is not preferred. In addition, since the mixing ratio of small particles in the resin increases, when used as lighting equipment, etc.
The transmitted light is undesirably reddish. On the other hand, when only the crosslinked resin fine particles having an average particle diameter of 5 μm or more are used, the light transmittance is high, but the concealing property is insufficient, and the transparency of a light source such as a fluorescent lamp when used as a lighting fixture or the like is poor. In order to prevent this, it is necessary to increase the addition amount, which is not economically preferable.
【００１２】また、本発明の光拡散性樹脂組成物におけ
る、平均粒子径５μｍ未満の架橋樹脂微粒子と平均粒子
径５〜１０μｍの架橋樹脂微粒子の添加量は、成形品表
面の肌荒れを起こさないこと、耐衝撃強度が実用上、不
都合なほど低下しないこと、真空成形等の２次加工性が
容易であること、経済性などを考慮すると、樹脂１００
重量部に対して、それぞれ５重量部以下、好ましくは３
重量部以下であることが必要であり、板厚を考慮する
と、それぞれ６〜３０ｇ／m2、好ましくは８〜２０ｇ／
m2であることが好ましい。粒子径の範囲の異なる２つの
架橋樹脂微粒子の添加量の比率は、通常１：１の混合割
合で使用されるが、特に制限はなく用途に応じて適宜調
整することができる。The amount of the crosslinked resin particles having an average particle diameter of less than 5 μm and the amount of the crosslinked resin particles having an average particle diameter of 5 to 10 μm in the light diffusing resin composition of the present invention does not cause roughening of the surface of the molded article. Considering that the impact strength does not decrease in a practically inconvenient manner, that the secondary workability such as vacuum forming is easy, and that the economy is high, the resin 100
5 parts by weight or less, preferably 3 parts by weight,
It is necessary to be not more than 5 parts by weight, and in consideration of the plate thickness, each is 6 to 30 g / m 2 , preferably 8 to 20 g / m 2 .
m 2 is preferred. The ratio of the added amounts of the two crosslinked resin fine particles having different particle diameter ranges is usually used at a mixing ratio of 1: 1. However, there is no particular limitation, and the ratio can be appropriately adjusted depending on the application.
【００１３】本発明の光拡散性樹脂組成物には、さらに
無機透明物質粉末を混合・分散せしめることができ、拡
散性の向上および反射光における白さの向上をはかるこ
とができる。本発明に使用できる無機透明物質粉末とし
ては、特に限定されないが、例えば硫酸バリウム、炭酸
カルシウム等が好ましく用いられる。該無機透明物質粉
末の平均粒子径としては、１〜１０μｍ、好ましくは３
〜８μｍのものであることが望ましく、またその添加量
としては、樹脂１００重量部に対して、５重量部以下、
好ましくは０．１〜３重量部、より好ましくは０．１〜
２重量部であることが望ましい。無機透明物質粉末の添
加量は、高い光拡散性と高い光線透過率を得るという観
点から、前記架橋樹脂微粒子の添加量より少ないことが
好ましい。The light-diffusing resin composition of the present invention can further be mixed and dispersed with an inorganic transparent substance powder, thereby improving the diffusivity and whiteness in reflected light. The inorganic transparent substance powder that can be used in the present invention is not particularly limited, but for example, barium sulfate, calcium carbonate and the like are preferably used. The inorganic transparent material powder has an average particle diameter of 1 to 10 μm, preferably 3 to 10 μm.
-8 μm, and the amount of addition is preferably 5 parts by weight or less based on 100 parts by weight of the resin.
Preferably 0.1 to 3 parts by weight, more preferably 0.1 to 3 parts by weight
Desirably, it is 2 parts by weight. The addition amount of the inorganic transparent substance powder is preferably smaller than the addition amount of the crosslinked resin fine particles from the viewpoint of obtaining high light diffusivity and high light transmittance.
【００１４】本発明の光拡散性樹脂組成物を製造する方
法としては、特に制限されず、例えば注型重合法、溶融
混合法等を採用して製造することができる。本発明の光
拡散性樹脂組成物は、高い光拡散性と高い光線透過率を
有するため、照明カバー、照明看板、ディスプレー、グ
レージング等の成形素材として好適であり、射出成形、
押出成形などにより、前記照明器具、各種ディスプレ
ー、グレージング製品を製造することができる。The method for producing the light diffusing resin composition of the present invention is not particularly limited, and it can be produced by, for example, a casting polymerization method, a melt mixing method, or the like. The light-diffusing resin composition of the present invention has a high light-diffusing property and a high light transmittance, so it is suitable as a molding material for lighting covers, lighting signs, displays, glazing, etc.
The lighting fixture, various displays, and glazing products can be manufactured by extrusion molding or the like.
【００１５】[0015]
【実施例】以下、実施例により、本発明を詳細に説明す
る。なお、評価、測定方法は次の方法により実施した。Hereinafter, the present invention will be described in detail with reference to examples. In addition, evaluation and the measuring method were implemented by the following methods.
【００１６】（全光線透過率およびヘイズ値の測定）Ｊ
ＩＳ Ｋ６７１７に準拠して、積分球式光線透過率測定
装置（スガ試験機株式会社製：ＨＧＭ−２ＤＰ）を用い
て測定した。(Measurement of total light transmittance and haze value)
In accordance with IS K6717, it was measured using an integrating sphere light transmittance measuring device (HGM-2DP, manufactured by Suga Test Instruments Co., Ltd.).
【００１７】（透過特性の評価）変角光度計（村上色彩
研究所製：ＧＰ−１Ｒ）を用いて相対透過率を測定し、
次式（１）より拡散係数（Ｄ）を算出した。(Evaluation of Transmission Characteristics) The relative transmittance was measured using a goniophotometer (GP-1R, manufactured by Murakami Color Research Laboratory).
The diffusion coefficient (D) was calculated from the following equation (1).
【００１８】[0018]
【数１】 Ｄ＝（Ｂ20＋Ｂ70）／２Ｂ5 （１）D = (B 20 + B 70 ) / 2B 5 (1)
【００１９】（式中、Ｂ20、Ｂ70およびＢ5は、それぞ
れ受光角ｘ＝２０°、７０°および５°における輝度を
あらわし、次式（２）により算出して求めた値である。(Where B 20 , B 70, and B 5 represent the brightness at the light receiving angles x = 20 °, 70 °, and 5 °, respectively, and are values calculated by the following equation (2).
【００２０】[0020]
【数２】 Ｂｘ＝Ｔｘ／ｃｏｓｘ （２）Bx = Tx / cosx (2)
【００２１】式中、 Ｂｘは、受光角ｘにおける輝度を
表し、 Ｔｘは、ｘ＝０°（平行光）における光線透過
率を１００％とした場合の受光角ｘにおける相対透過率
（％）を表す。）In the equation, Bx represents the luminance at the light receiving angle x, and Tx is the relative transmittance (%) at the light receiving angle x when the light transmittance at x = 0 ° (parallel light) is 100%. Represent. )
【００２２】（透けの評価）光拡散性の目視判定である
透けの評価は、１０Ｗの直管蛍光灯の前方８ｃｍの位置
に試料片を置き、さらにその試料片から１ｍ離れた位置
で試料片を通して蛍光灯の輪郭が見えるかどうかを目視
観察することによって行い、その観察結果を次の記号に
より示した。 ○ ：蛍光灯の輪郭は認められない。 △ ：蛍光灯の輪郭がかすかに認められる。 ×：蛍光灯の輪郭が明瞭に認められる。(Evaluation of Transparency) In the evaluation of translucency, which is a visual judgment of light diffusivity, a sample piece was placed at a position 8 cm in front of a 10 W straight tube fluorescent lamp, and further at a position 1 m away from the sample piece. The observation was made by visually observing whether or not the outline of the fluorescent lamp was visible through the light source. The observation result was indicated by the following symbols. : The outline of the fluorescent lamp is not recognized. Δ: The outline of the fluorescent lamp is slightly recognized. X: The outline of the fluorescent lamp is clearly recognized.
【００２３】（平均粒子径の測定）平均粒子径（重量平
均粒子径）は、粒度分布測定機（（株）セイシン企業
製：ＳＫＡ−５０００）により測定した。(Measurement of Average Particle Diameter) The average particle diameter (weight average particle diameter) was measured by a particle size distribution analyzer (manufactured by Seishin Enterprise Co., Ltd .: SKA-5000).
【００２４】（実施例１）メタクリル酸メチル単位９５
重量％およびアクリル酸メチル単位５重量％からなり、
重量平均分子量が１６０，０００であるメタクリル樹脂
１００重量部に対して、平均粒子径が３μｍ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）と、平均粒子径が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２００
０Ｂ）を配合、撹拌混合し、これを単軸押出機により、
混練溶融押出し、シート成形用のＴダイでシート状に成
形した後、ポリッシングロールで冷却して、厚さ２ｍｍ
の外観の良好な平板成形品を得た。このシートを評価し
た結果を表１に示した。(Example 1) Methyl methacrylate unit 95
% By weight and 5% by weight of methyl acrylate units,
For 100 parts by weight of methacrylic resin having a weight average molecular weight of 160,000, spherical silicone resin fine particles having an average particle diameter of 3 μm (Toshiba Silicone Co., Ltd .: Tospearl 130) and spherical silicone having an average particle diameter of 6 μm Resin fine particles (Toshiba Silicone Co., Ltd .: Tospearl 200)
OB) is mixed, stirred and mixed, and this is mixed with a single screw extruder.
After kneading, melt-extruding and forming into a sheet with a T-die for forming a sheet, the sheet is cooled with a polishing roll to a thickness of 2 mm.
A flat molded article having an excellent appearance was obtained. Table 1 shows the results of evaluating this sheet.
【００２５】（実施例２）粒子径が３μｍの真球状シリ
コーン樹脂微粒子、粒子径が６μｍの真球状シリコーン
樹脂微粒子および粒子径が７μｍの炭酸カルシウムを表
１に示す割合で使用する以外は実施例１と同様にして、
外観良好な平板成形品を得た。このシートを評価した結
果を表１に示した。(Example 2) Except that spherical silicone resin fine particles having a particle diameter of 3 µm, spherical silicone resin fine particles having a particle diameter of 6 µm, and calcium carbonate having a particle diameter of 7 µm are used in the proportions shown in Table 1, In the same way as 1,
A flat molded product with good appearance was obtained. Table 1 shows the results of evaluating this sheet.
【００２６】（実施例３）粒子径が４μｍのスチレン架
橋樹脂微粒子（積水化成品工業（株）製：ＳＢＸ−４）
と粒子径が８μｍのスチレン架橋樹脂微粒子（積水化成
品工業（株）製：ＳＢＸ−８）を表１に示す割合で使用
する以外は実施例１と同様にして、外観良好な平板成形
品を得た。このシートを評価した結果を表１に示した。(Example 3) Styrene crosslinked resin fine particles having a particle diameter of 4 µm (SBX-4, manufactured by Sekisui Chemical Co., Ltd.)
And a styrene crosslinked resin fine particle having a particle diameter of 8 μm (SBX-8, manufactured by Sekisui Chemical Co., Ltd.) at a ratio shown in Table 1, in the same manner as in Example 1 to obtain a flat molded article having a good appearance. Obtained. Table 1 shows the results of evaluating this sheet.
【００２７】（比較例１）粒子径が３μｍの真球状シリ
コーン樹脂微粒子のみを表１に示す量で使用する以外は
実施例１と同様にして平板成形品を得た。このシートの
評価結果を表１に示すが、この結果より、実施例１と比
較すると、拡散係数は高いが、光線透過率が低いことが
わかる。Comparative Example 1 A flat molded product was obtained in the same manner as in Example 1 except that only spherical silicone resin fine particles having a particle diameter of 3 μm were used in the amounts shown in Table 1. The evaluation results of this sheet are shown in Table 1. From the results, it can be seen that the diffusion coefficient is higher but the light transmittance is lower as compared with Example 1.
【００２８】（比較例２）粒子径が６μｍの真球状シリ
コーン樹脂微粒子のみを表１に示す量で使用する以外は
実施例１と同様にして平板成形品を得た。このシートの
評価結果を表１に示すが、この結果より、実施例１と比
較すると、光線透過率は高いが、拡散係数が低く光拡散
性に劣ることがわかる。Comparative Example 2 A flat molded product was obtained in the same manner as in Example 1 except that only spherical silicone resin fine particles having a particle diameter of 6 μm were used in the amounts shown in Table 1. The evaluation results of this sheet are shown in Table 1. From this result, it can be seen that, compared with Example 1, although the light transmittance was high, the diffusion coefficient was low and the light diffusion property was poor.
【００２９】（比較例３）粒子径が４μｍのスチレン架
橋樹脂微粒子（積水化成品工業（株）製：ＳＢＸ−４）
のみを表１に示す量で使用する以外は実施例１と同様に
して平板成形品を得た。このシートの評価結果を表１に
示すが、実施例３と比較すると拡散係数は同程度である
が、光線透過率が低いことがわかる。(Comparative Example 3) Styrene-crosslinked resin fine particles having a particle diameter of 4 μm (SBX-4, manufactured by Sekisui Chemical Co., Ltd.)
A flat molded product was obtained in the same manner as in Example 1 except that only the amount shown in Table 1 was used. The evaluation results of this sheet are shown in Table 1. It can be seen that the diffusion coefficient is almost the same as that of Example 3 but the light transmittance is low.
【００３０】（比較例４）粒子径７μｍの炭酸カルシウ
ム粉末のみを表１に示す量で使用する以外は実施例１と
同様にして平板成形品を得た。このシートの評価結果を
表１に示すが、本発明の微粒子を使用したものに比べ、
拡散係数は高いが光線透過率が低いことがわかる。Comparative Example 4 A flat molded product was obtained in the same manner as in Example 1 except that only the calcium carbonate powder having a particle diameter of 7 μm was used in the amount shown in Table 1. The evaluation results of this sheet are shown in Table 1, and compared with those using the fine particles of the present invention.
It can be seen that the diffusion coefficient is high but the light transmittance is low.
【００３１】[0031]
【表１】 [Table 1]
【００３２】[0032]
【発明の効果】以上のように、本発明の光拡散性樹脂組
成物は、平均粒子径が５μｍ未満の架橋樹脂微粒子と平
均粒子径が５〜１０μｍの架橋樹脂微粒子を併用するこ
とにより、より高い光拡散性と高い光線透過率を発現で
き、またさらにこれらの架橋樹脂微粒子に加えて必要に
応じて無機透明物質粉末を添加することにより白色度が
調節できるので、照明カバー、照明看板、ディスプレ
ー、グレージング等の成形材料として好適である。As described above, the light-diffusing resin composition of the present invention can be obtained by using a crosslinked resin fine particle having an average particle diameter of less than 5 μm and a crosslinked resin fine particle having an average particle diameter of 5 to 10 μm in combination. High light diffusivity and high light transmittance can be exhibited, and the degree of whiteness can be adjusted by adding an inorganic transparent substance powder as needed in addition to these crosslinked resin fine particles, so that lighting covers, lighting signs, displays It is suitable as a molding material for glazing and the like.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ０８Ｌ 25:04） (72)発明者 高橋 清 新潟県北蒲原郡中条町倉敷町２番28号 株 式会社クラレ内 (72)発明者 石山 稔 新潟県北蒲原郡中条町倉敷町２番28号 株 式会社クラレ内──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C08L 25:04) (72) Inventor Kiyoshi Takahashi 2-28 Kurashiki-cho, Nakajo-cho, Kitakanbara-gun, Niigata Kuraray Co., Ltd. (72) Inventor Minoru Ishiyama 2-28 Kurashiki-cho, Nakajo-machi, Kitakanbara-gun, Niigata Pref. Kuraray Co., Ltd.
Claims (4)
μｍ未満の架橋樹脂微粒子を５重量部以下の量および平
均粒子径５〜１０μｍの架橋樹脂微粒子を５重量部以下
の量それぞれ分散せしめることを特徴とする光拡散性樹
脂組成物。An average particle size of 5 parts per 100 parts by weight of a transparent resin.
A light-diffusing resin composition characterized by dispersing crosslinked resin fine particles having a particle size of less than 5 µm or less and crosslinked resin fine particles having an average particle size of 5 to 10 µm in an amount of 5 parts by weight or less.
μｍ未満の架橋樹脂微粒子を５重量部以下の量、平均粒
子径５〜１０μｍの架橋樹脂微粒子を５重量部以下の
量、および無機透明物質粉末を５重量部以下の量それぞ
れ分散せしめることを特徴とする光拡散性樹脂組成物。2. An average particle diameter of 5 parts per 100 parts by weight of the transparent resin.
It is characterized by dispersing the crosslinked resin fine particles of less than 5 μm in an amount of 5 parts by weight or less, the crosslinked resin fine particles having an average particle diameter of 5 to 10 μm in an amount of 5 parts by weight or less, and the inorganic transparent substance powder in an amount of 5 parts by weight or less. Light diffusing resin composition.
子および／またはスチレン系架橋樹脂微粒子である請求
項１または２記載の光拡散性樹脂組成物。3. The light diffusing resin composition according to claim 1, wherein the crosslinked resin fine particles are silicone resin fine particles and / or styrene-based crosslinked resin fine particles.
求項１〜３のいずれか１項に記載の光拡散性樹脂組成
物。4. The light diffusing resin composition according to claim 1, wherein the transparent resin is a methacrylic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9227559A JPH1160966A (en) | 1997-08-08 | 1997-08-08 | Light diffusing resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9227559A JPH1160966A (en) | 1997-08-08 | 1997-08-08 | Light diffusing resin composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1160966A true JPH1160966A (en) | 1999-03-05 |
Family
ID=16862812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9227559A Pending JPH1160966A (en) | 1997-08-08 | 1997-08-08 | Light diffusing resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1160966A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006062171A1 (en) * | 2004-12-09 | 2006-06-15 | Denki Kagaku Kogyo Kabushiki Kaisha | Styrene resin composition and sheet thereof |
| JP2006267592A (en) * | 2005-03-24 | 2006-10-05 | Soken Chem & Eng Co Ltd | Light diffusing plate |
| JP2008063447A (en) * | 2006-09-07 | 2008-03-21 | Jsr Corp | Light-diffusing resin composition, molded article and light guide comprising same |
| US7419715B2 (en) | 2000-07-18 | 2008-09-02 | Omron Corporation | Light diffusing films |
| JP2009522426A (en) * | 2006-01-05 | 2009-06-11 | ゼネラル・エレクトリック・カンパニイ | Polycarbonate composition and mat surface and articles formed therefrom having high light transmission |
| US7754325B2 (en) | 2006-01-31 | 2010-07-13 | Ps Japan Corporation | Rubber-modified styrene-based resin and light diffusion plate containing such resin |
| JP2012077174A (en) * | 2010-09-30 | 2012-04-19 | Sekisui Plastics Co Ltd | Light diffusible resin composition and light diffusible member |
| WO2018019965A1 (en) | 2016-07-29 | 2018-02-01 | Arkema France | A (meth)acrylic composition comprising particles, its method of preparation, its use and object comprising it |
| WO2018019966A2 (en) | 2016-07-29 | 2018-02-01 | Arkema France | A (meth)acrylic composition comprising particles, its method of preparation and its use as masterbatch |
| WO2019149837A1 (en) | 2018-01-31 | 2019-08-08 | Arkema France | A (meth)acrylic polymer composition comprising particles, its method of preparation and its use as masterbatch |
-
1997
- 1997-08-08 JP JP9227559A patent/JPH1160966A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7419715B2 (en) | 2000-07-18 | 2008-09-02 | Omron Corporation | Light diffusing films |
| WO2006062171A1 (en) * | 2004-12-09 | 2006-06-15 | Denki Kagaku Kogyo Kabushiki Kaisha | Styrene resin composition and sheet thereof |
| KR101234451B1 (en) * | 2004-12-09 | 2013-02-18 | 덴끼 가가꾸 고교 가부시키가이샤 | Styrene resin composition and sheet thereof |
| JP2006267592A (en) * | 2005-03-24 | 2006-10-05 | Soken Chem & Eng Co Ltd | Light diffusing plate |
| JP2009522426A (en) * | 2006-01-05 | 2009-06-11 | ゼネラル・エレクトリック・カンパニイ | Polycarbonate composition and mat surface and articles formed therefrom having high light transmission |
| US7754325B2 (en) | 2006-01-31 | 2010-07-13 | Ps Japan Corporation | Rubber-modified styrene-based resin and light diffusion plate containing such resin |
| JP2008063447A (en) * | 2006-09-07 | 2008-03-21 | Jsr Corp | Light-diffusing resin composition, molded article and light guide comprising same |
| JP2012077174A (en) * | 2010-09-30 | 2012-04-19 | Sekisui Plastics Co Ltd | Light diffusible resin composition and light diffusible member |
| WO2018019965A1 (en) | 2016-07-29 | 2018-02-01 | Arkema France | A (meth)acrylic composition comprising particles, its method of preparation, its use and object comprising it |
| WO2018019966A2 (en) | 2016-07-29 | 2018-02-01 | Arkema France | A (meth)acrylic composition comprising particles, its method of preparation and its use as masterbatch |
| WO2018019966A3 (en) * | 2016-07-29 | 2018-03-22 | Arkema France | A (meth)acrylic composition comprising particles, its method of preparation and its use as masterbatch |
| CN109791217A (en) * | 2016-07-29 | 2019-05-21 | 阿肯马法国公司 | (methyl) acrylic-based compositions, preparation method and its purposes as masterbatch comprising particle |
| JP2019523326A (en) * | 2016-07-29 | 2019-08-22 | アルケマ フランス | (Meth) acrylic composition containing particles, preparation method thereof, and use as masterbatch |
| US10907039B2 (en) | 2016-07-29 | 2021-02-02 | Arkema France | (Meth)acrylic composition comprising particles, its method of preparation, its use and object comprising it |
| US10934425B2 (en) | 2016-07-29 | 2021-03-02 | Arkema France | (Meth)acrylic composition comprising particles, its method of preparation and its use as masterbatch |
| CN109791217B (en) * | 2016-07-29 | 2023-04-11 | 盛禧奥欧洲有限责任公司 | (meth) acrylic composition comprising particles, method for preparing same and use thereof as masterbatch |
| WO2019149837A1 (en) | 2018-01-31 | 2019-08-08 | Arkema France | A (meth)acrylic polymer composition comprising particles, its method of preparation and its use as masterbatch |
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