JP5307764B2 - Light guide / light emitting molded body and light guide / light emitting device - Google Patents

Light guide / light emitting molded body and light guide / light emitting device Download PDF

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JP5307764B2
JP5307764B2 JP2010129010A JP2010129010A JP5307764B2 JP 5307764 B2 JP5307764 B2 JP 5307764B2 JP 2010129010 A JP2010129010 A JP 2010129010A JP 2010129010 A JP2010129010 A JP 2010129010A JP 5307764 B2 JP5307764 B2 JP 5307764B2
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light
light guide
ethylene
copolymer
light emitting
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JP2011257438A (en
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裕 保谷
浩登 安井
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Mitsui Chemicals Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guiding/emitting molded article and a light guiding/emitting device that have flexibility, transparency and heat resistance. <P>SOLUTION: A light guiding/emitting molded article includes a core layer and a cladding layer. The core layer contains an ethylene copolymer having a melting point of 50-130&deg;C, which is obtained based on a melting peak temperature observed in a DSC measurement, and the core layer is made of a thermoplastic resin having a Shore D hardness ranging in 15-70. Further provided are: a light guiding/emitting device including the light guiding/emitting molded article; an optical fiber; and an LED light emitting device including the optical fiber and an LED light source element. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

本発明は、エチレン共重合体を含む熱可塑性樹脂からなる導光/発光成形体および該導光/発光成形体を含む導光/発光装置に関する。
に関する。
The present invention relates to a light guide / light emitting molded body made of a thermoplastic resin containing an ethylene copolymer and a light guide / light emitting device including the light guide / light emitting molded body.
About.

LED素子などの点光源から発生する光線を透明材料へ入射し、この光を任意の方向に向けて発光させる導光装置は、イルミネーションなどの照明用途や液晶バックライトのような電気・電子用途で幅広く利用されている。
このような透明材料としてはガラスなどの無機材料だけでなくポリカーボネート(PC)やアクリル樹脂(PMMA)などのような有機材料が従来広く利用されており、このような有機材料は可とう性を有しているため有用である。
しかしながら、近年デザインに合わせて自在に曲ることが可能な柔軟な導光装置が求められているが、前記材料を用いて得られる導光装置は可とう性が十分ではない。またこれらの材料を柔軟化するためには軟化材の配合が不可避であるが、軟化材を添加すると、材料の透明性が低下する。
一方、透明で柔軟な素材として軟質塩化ビニル樹脂(PVC)や熱可塑性ポリウレタン樹脂(TPU)、さらには水添スチレン系ブロック共重合体(SEBS)、シリコーン樹脂などが知られているが、PVCやSEBSは薄いシートやフィルムにおいては透明であるが、可視光を吸収するために導光材料の光路長を長くすると導光作用が大きく低下する。また、通常のTPUは長期間使用時の変色(黄変)や耐候性、耐加水分解性に難がある。また、シリコーン樹脂は架橋を必要とするため、生産効率が劣る。
また、特許文献5には、線状発光体の導光材料として非晶性ポリオレフィン材料を用いることが開示されているが、融点を示す結晶成分が存在しない場合、耐熱性の面で実用上の問題が生じる。
このため、柔軟性と透明性、耐熱性を併せ持つ、より好ましくは耐候性や耐湿性も有し、生産が容易な導光/発光成形体用材料が強く求められている。
Light guide devices that emit light emitted from point light sources such as LED elements into transparent materials and emit light in any direction are used for illumination applications such as illumination and electrical / electronic applications such as liquid crystal backlights. Widely used.
As such transparent materials, not only inorganic materials such as glass but also organic materials such as polycarbonate (PC) and acrylic resin (PMMA) have been widely used. Such organic materials have flexibility. This is useful.
However, in recent years, there has been a demand for a flexible light guide device that can be bent freely in accordance with the design. However, the light guide device obtained using the above materials is not sufficiently flexible. Further, in order to soften these materials, it is inevitable to add a softening material. However, when a softening material is added, the transparency of the material is lowered.
On the other hand, soft vinyl chloride resin (PVC), thermoplastic polyurethane resin (TPU), hydrogenated styrene block copolymer (SEBS), silicone resin, etc. are known as transparent and flexible materials. SEBS is transparent in thin sheets and films, but if the optical path length of the light guide material is increased in order to absorb visible light, the light guide action is greatly reduced. Moreover, normal TPU has difficulty in discoloration (yellowing), weather resistance, and hydrolysis resistance during long-term use. Moreover, since the silicone resin requires cross-linking, the production efficiency is inferior.
Patent Document 5 discloses that an amorphous polyolefin material is used as a light guide material for a linear light emitter. However, when there is no crystalline component having a melting point, it is practical in terms of heat resistance. Problems arise.
For this reason, there is a strong demand for a light guide / light emitting molded body material that has both flexibility, transparency, and heat resistance, more preferably weather resistance and moisture resistance, and is easy to produce.

特開平11-273435号公報Japanese Patent Laid-Open No. 11-273435 特開平11-066928号公報Japanese Patent Laid-Open No. 11-066928 特開2000-338330号公報JP 2000-338330 A 特開2001-281456号公報JP 2001-281456 JP 特開2004-184974号公報JP 2004-184974 A

本発明は、上記課題を改善する導光/発光成形体よび導光/発光装置の提供、より具体的には、柔軟性と透明性、耐熱性を併せ持つ導光/発光成形体よび導光/発光装置の提供を目的とする。
The present invention provides a light guide / light-emitting molded article and a light guide / light-emitting device that improve the above-described problems, and more specifically, a light guide / light-emitting molded article and a light guide / light-emitting article having both flexibility, transparency, and heat resistance. An object is to provide a light-emitting device.

本発明者らは、鋭意検討を行った結果、特定の特性を有する熱可塑性樹脂によってかかる課題を解決できることを見出した。すなわち本発明の概要は以下のとおりである。
〔1〕コア層とクラッド層を含む導光/発光成形体であって、
該コア層が、DDSC測定で観察される融解ピーク温度から求められる融点が50〜130℃であるエチレン共重合体を含み、かつショアーD硬度が10〜80の範囲にある熱可塑性樹脂からなることを特徴とする導光成形体。
〔2〕前記エチレン共重合体が、エチレン/アルファオレフィン共重合体、エチレン/酢酸ビニル共重合体、エチレン/不飽和カルボン酸共重合体、またはエチレン/不飽和カルボン酸共重合体のアイオノマーから選ばれるであるエチレン共重合体であることを特徴とする〔1〕の導光成形体。
〔3〕前記クラッド層の屈折率が、前記コア層の屈折率よりも低いことを特徴とする〔1〕〜〔2〕の導光/発光成形体。
〔4〕〔1〕〜〔3〕いずれかの導光/発光成形体からなる光ファイバー。
〔5〕〔1〕〜〔2〕の導光/発光成形体を含む導光/発光装置。
〔6〕〔4〕の光ファイバーとLED光源素子を含むLED発光装置。
As a result of intensive studies, the present inventors have found that such a problem can be solved by a thermoplastic resin having specific characteristics. That is, the outline of the present invention is as follows.
[1] A light guide / light emitting molded article including a core layer and a clad layer,
The core layer is made of a thermoplastic resin containing an ethylene copolymer having a melting point of 50 to 130 ° C. determined from a melting peak temperature observed by DDSC measurement and having a Shore D hardness of 10 to 80. A light guide molded article characterized by the above.
[2] The ethylene copolymer is selected from an ethylene / alpha olefin copolymer, an ethylene / vinyl acetate copolymer, an ethylene / unsaturated carboxylic acid copolymer, or an ionomer of an ethylene / unsaturated carboxylic acid copolymer. The light guide molded article according to [1], which is an ethylene copolymer.
[3] The light guide / light-emitting molded article according to [1] to [2], wherein a refractive index of the cladding layer is lower than a refractive index of the core layer.
[4] An optical fiber comprising the light guide / light emitting molded article according to any one of [1] to [3].
[5] A light guide / light emitting device including the light guide / light emitting molded article according to [1] to [2].
[6] An LED light emitting device including the optical fiber of [4] and an LED light source element.

本発明の導光/発光成形体(好ましくは光ファイバー)、ならびに導光/発光装置(好ましくはLED導光/発光装置)は、柔軟性と透明性、耐熱性を併せ持ち、更には耐候性や耐湿性も有する。また生産の容易性も有する。
The light guide / light-emitting molded article (preferably optical fiber) and the light guide / light-emitting device (preferably LED light guide / light-emitting device) of the present invention have both flexibility, transparency and heat resistance, as well as weather resistance and moisture resistance. It also has sex. It also has ease of production.

実施例における導光性評価方法を模式的に示した図である。It is the figure which showed typically the light guide evaluation method in an Example.

以下、本発明の実施形態について説明する。
エチレン共重合体
本願発明の導光成形体のコア層を構成する樹脂組成物に含まれるエチレン共重合体は、エチレンを主成分(エチレンに由来する単量体単位が50〜99モル%、好ましくは70〜99モル%、より好ましくは80〜99モル%)とするものであり、エチレン/アルファオレフィン共重合体、エチレン/酢酸ビニル共重合体、エチレン/酢酸ビニル/不飽和カルボン酸共重合体、エチレン/エチルアクリレート共重合体、エチレン/メチルメタクリレート共重合体、エチレン/アクリル酸共重合体、エチレン/メタクリル酸共重合体、エチレン/無水マレイン酸共重合体、エチレン/アミノアルキルメタクリレート共重合体、エチレン/ビニルシラン共重合体、エチレン/スチレン共重合体、エチレン/グリシジルメタクリレート共重合体、エチレン/ヒドロキシエチルメタクリレート共重合体、エチレン/不飽和カルボン酸共重合体のアイオノマー等が挙げられる。
エチレン/アルファオレフィン共重合体としては、メタロセン系触媒に代表されるシングルサイト触媒によって重合されたエチレン/アルファオレフィン共重合体が好適である。このようにして得られたエチレン/アルファオレフィン共重合体は、分子量分布や組成分布が狭いことで良好な透明性が得られるため好適である。
エチレン/アルファオレフィン共重合体を構成するアルファオレフィンとしては、プロピレン、1−ブテン、1−ヘキセン、4−メチル−1−ペンテン、1−オクテン、1−デセンなどが例示されるが、特に1−ブテン、1−オクテンが好ましい。
このようなエチレン/アルファオレフィン共重合体の密度(ASTM D1505)は870〜920kg/m、好ましくは880〜900kg/m、より好ましくは880〜890kg/mのものが好適である。密度がこの範囲にあると、透明性と耐熱性の両立、さらには比較的高い屈折率を得ることができる。
また、エチレン/不飽和カルボン酸共重合体のアイオノマーとしては、金属種に、リチウム、ナトリウムなどのアルカリ金属、カルシウム、マグネシウム、亜鉛、アルミニウムなどの多価金属が用いられたものを例示することができる。
本発明に用いるエチレン共重合体の融点は、DSC測定で観察される融解ピーク温度(融解による吸熱カーブが複数の場合あるいは融解ピークが複数重複したショルダーピークを示す場合、最大吸熱量値を示した温度)から求められ、50〜130℃、好ましくは60〜130℃、より好ましくは70〜130℃である。融点がこれよりも低いものは、コア層の構成材料である熱可塑性樹脂の主要成分として用いても非晶性材料と同程度に耐熱性に劣り、実用上問題が生じる恐れがある。一方、融点がこれよりも高いものは、コア層の構成材料である熱可塑性樹脂の主要成分として用いても透明性が低下するため好ましくない。ただし、該熱可塑性樹脂の物性を損なわない範囲でならば、融点が低いものや高いエチレン共重合体が含まれていても構わない。
エチレン/アルファオレフィン共重合体、エチレン/酢酸ビニル共重合体、エチレン/不飽和カルボン酸共重合体およびエチレン/不飽和カルボン酸共重合体のアイオノマーが、後述の特性を満たす熱可塑性樹脂として好適に用いることができるが、中でもエチレン/アルファオレフィン共重合体およびエチレン/不飽和カルボン酸共重合体のアイオノマーが、耐湿性(吸湿なし)や色相安定性の観点から特に好ましい。
Hereinafter, embodiments of the present invention will be described.
Ethylene copolymer The ethylene copolymer contained in the resin composition constituting the core layer of the light guide molded article of the present invention is composed mainly of ethylene (the monomer unit derived from ethylene is 50 to 99 mol%, preferably 70-99 mol%, more preferably 80-99 mol%), ethylene / alpha olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / unsaturated carboxylic acid copolymer , Ethylene / ethyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, ethylene / maleic anhydride copolymer, ethylene / aminoalkyl methacrylate copolymer , Ethylene / vinyl silane copolymer, ethylene / styrene copolymer, ethylene / glycidyl methacrylate Preparative copolymer, ethylene / hydroxyethyl methacrylate copolymer, ionomers of ethylene / unsaturated carboxylic acid copolymer.
As the ethylene / alpha olefin copolymer, an ethylene / alpha olefin copolymer polymerized by a single site catalyst typified by a metallocene catalyst is suitable. The ethylene / alpha olefin copolymer obtained in this way is preferable because of its good transparency due to its narrow molecular weight distribution and composition distribution.
Examples of the alpha olefin constituting the ethylene / alpha olefin copolymer include propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene and the like. Butene and 1-octene are preferred.
The density (ASTM D1505) of such an ethylene / alpha olefin copolymer is 870 to 920 kg / m 3 , preferably 880 to 900 kg / m 3 , more preferably 880 to 890 kg / m 3 . When the density is in this range, both transparency and heat resistance can be achieved, and a relatively high refractive index can be obtained.
Examples of the ionomer of the ethylene / unsaturated carboxylic acid copolymer include those in which an alkali metal such as lithium or sodium or a polyvalent metal such as calcium, magnesium, zinc or aluminum is used as the metal species. it can.
The melting point of the ethylene copolymer used in the present invention was the melting peak temperature observed by DSC measurement (when there were a plurality of endothermic curves due to melting, or when the melting peak showed a plurality of overlapping shoulder peaks, the maximum endothermic value was shown. The temperature is 50 to 130 ° C, preferably 60 to 130 ° C, more preferably 70 to 130 ° C. If the melting point is lower than this, even if it is used as a main component of the thermoplastic resin that is a constituent material of the core layer, the heat resistance is inferior to that of an amorphous material, which may cause problems in practice. On the other hand, a material having a melting point higher than this is not preferable because transparency is lowered even when used as a main component of a thermoplastic resin which is a constituent material of the core layer. However, as long as the physical properties of the thermoplastic resin are not impaired, those having a low melting point or a high ethylene copolymer may be contained.
An ionomer of ethylene / alpha olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / unsaturated carboxylic acid copolymer and ethylene / unsaturated carboxylic acid copolymer is suitable as a thermoplastic resin satisfying the properties described later. Among them, ethylene / alpha olefin copolymers and ethylene / unsaturated carboxylic acid ionomers are particularly preferred from the viewpoint of moisture resistance (no moisture absorption) and hue stability.

熱可塑性樹脂
本発明の熱可塑性樹脂は、上述のエチレン共重合体を含む(好ましくは80〜100重量%、より好ましくは90〜100重量%、さらにより好ましくは95〜100重量%)樹脂組成物であり、ショアーD硬度(ASTM D2240に準拠)が10〜80、好ましくは15〜75、より好ましくは20〜70である。硬度がこれよりも低いものは耐傷付き性が劣るため、導光成形体を導光装置へ組み込む際に弊害が生じる恐れがある。また、硬度がこれよりも高いと柔軟性が低下するため好ましくない。
さらに、本発明に用いるエチレン共重合からなる熱可塑性樹脂は以下の特性を有しているものがより好適である。
本発明に用いるエチレン共重合からなる熱可塑性樹脂のメルトフローレート(MFR、ASTM D1238、190℃、2.16kgf)は0.1〜100g/10min、好ましくは0.5〜50g/10min、より好ましくは0.6〜40g/10minにある。MFRがこの範囲にあることで、透明性に優れた成形体を得ることができる。
また、該熱可塑性樹脂組成物には、コア層の構成材料として用いた際に本発明の目的を損なわない範囲で、各種添加剤(紫外線防止剤、スリップ剤、酸化防止剤、など)を添加してもよい。
Thermoplastic resin The thermoplastic resin of the present invention comprises the above-mentioned ethylene copolymer (preferably 80 to 100% by weight, more preferably 90 to 100% by weight, even more preferably 95 to 100% by weight). ) Resin composition having a Shore D hardness (based on ASTM D2240) of 10 to 80, preferably 15 to 75, and more preferably 20 to 70. If the hardness is lower than this, the scratch resistance is inferior, and there is a possibility that a bad effect may occur when the light guide molded body is incorporated into the light guide device. Moreover, since a softness | flexibility will fall when hardness is higher than this, it is unpreferable.
Furthermore, it is more preferable that the thermoplastic resin made of ethylene copolymer used in the present invention has the following characteristics.
The melt flow rate (MFR, ASTM D1238, 190 ° C., 2.16 kgf) of the thermoplastic resin comprising ethylene copolymer used in the present invention is 0.1 to 100 g / 10 min, preferably 0.5 to 50 g / 10 min, more preferably. Is 0.6 to 40 g / 10 min. When the MFR is in this range, a molded article having excellent transparency can be obtained.
In addition, various additives (ultraviolet ray inhibitor, slip agent, antioxidant, etc.) are added to the thermoplastic resin composition as long as the object of the present invention is not impaired when used as a constituent material of the core layer. May be.

導光/発光成形体
本発明の導光成形体とは、導光性を有する成形体のことであり、発光成形体は、発光性を有する成形体のことである。
導光/発光成形体は、前記エチレン共重合体を含む熱可塑性樹脂を溶融加工して得られる。具体的には、溶融押出成形、射出成形、プレス成形によって得られるものである。
導光/発光成形体の形状については特に制限はないが、棒状のものは(光ファイバーなどの)線状導光/発光体として有用である。
また、導光/発光成形体に光散乱性を有する粒子や顔料などを練りこんで分散させることも可能である。
好適な導光/発光成形体の実施態様(線状導光/発光体)をさらに詳述する。線状導光/発光体をコア層とし、この外側にクラッド層を設けることができる。この場合、クラッド層を形成する材料の屈折率は、コア層を形成する本発明のエチレン共重合からなる熱可塑性樹脂よりも低いものがより好ましい。
クラッド層として、好ましい材料としては、例えばフッ素樹脂、ポリメチルペンテン樹脂、シリコーンゴム、(メタ)アクリル系樹脂等が挙げられ、本発明の目的を損なわない範囲で各種添加剤(紫外線防止剤、スリップ剤、酸化防止剤、など)を添加してもよい。かかる実施態様として特に好ましいのは光ファイバーが挙げられる。
Light guide / light emitting molded article The light guide molded article of the present invention is a molded article having light guiding properties, and the light emitting molded article is a molded article having light emitting properties.
The light guide / light emitting molded body is obtained by melt-processing a thermoplastic resin containing the ethylene copolymer. Specifically, it is obtained by melt extrusion molding, injection molding, or press molding.
Although there is no restriction | limiting in particular about the shape of a light guide / light-emitting molded object, A rod-shaped thing is useful as a linear light guide / light-emitting body (such as an optical fiber).
It is also possible to knead and disperse light-scattering particles or pigments in the light guide / light emitting molded body.
A preferred embodiment of the light guide / light-emitting molded body (linear light guide / light-emitting body) will be described in more detail. A linear light guide / light emitting body can be used as a core layer, and a cladding layer can be provided outside the core layer. In this case, the refractive index of the material forming the cladding layer is more preferably lower than that of the thermoplastic resin comprising the ethylene copolymer of the present invention forming the core layer.
Preferred materials for the cladding layer include, for example, fluororesin, polymethylpentene resin, silicone rubber, (meth) acrylic resin, and the like. Agents, antioxidants, etc.) may be added. Particularly preferred as such an embodiment is an optical fiber.

導光/発光装置
本発明の導光/発光装置とは、上述の導光/発光成形体を含む導光/発光装置であり、具体的な実施態様としては、本発明の導光/発光成形体の好ましい一態様である光ファイバーとLED光源を組み合わせたLED発光装置が挙げられる。
Light Guide / Light Emitting Device The light guide / light emitting device of the present invention is a light guide / light emitting device including the above-described light guide / light emitting molded body. As a specific embodiment, the light guide / light emitting device of the present invention is used. An LED light-emitting device that combines an optical fiber and an LED light source, which is a preferred embodiment of the body, can be given.

以下、実施例を挙げて、さらに具体的に説明する。ただし、本発明はこれらの実施例等によってなんら制限されるものではない。
また、実施例において測定した物性評価、ならびに測定用サンプル作製は下記の方法に従って実施した。
Hereinafter, an example is given and it demonstrates more concretely. However, the present invention is not limited in any way by these examples.
Moreover, the physical property evaluation measured in the Examples and the measurement sample preparation were performed according to the following methods.

エチレン共重合体の物性評価
密度
ASTM D1505に準拠し、室温(23℃)で測定した。
融点
パーキンエルマー社製のDSC測定装置を用い、以下の測定条件で得たDSCカーブから決定した。
DSC測定装置内で10分間200℃保持した後、降温速度10℃/minで−20℃まで冷却し、−10℃で1分間保持した後、再度昇温速度10℃/minで180℃まで加熱することでDSC曲線を作成した
MFR
ASTM D1238に準拠し、2.16kg荷重下で測定した。
Physical property evaluation of ethylene copolymer Density was measured at room temperature (23C) in accordance with ASTM D1505.
It determined from the DSC curve obtained on the following measurement conditions using the DSC measuring apparatus made from melting | fusing point Perkin Elmer.
After holding at 200 ° C. for 10 minutes in the DSC measuring device, cooled to −20 ° C. at a temperature drop rate of 10 ° C./min, held at −10 ° C. for 1 minute, and then heated again to 180 ° C. at a temperature increase rate of 10 ° C./min MFR which created DSC curve by doing
Based on ASTM D1238, it was measured under a 2.16 kg load.

熱可塑性樹脂組成物の物性評価
ショアーD硬度
ASTM D2240に準拠し、押針接触後5秒後の目盛りを読み取った。
Physical property evaluation of thermoplastic resin composition Based on Shore D hardness ASTM D2240, the scale after 5 seconds from the contact with the pressing needle was read.

導光性能評価用サンプル作成方法
短軸押出成形機(スクリュー径:40mm、押出温度180〜230℃)を用いて熱可塑性樹脂を溶融押出しした後、水槽で冷却(15℃)することにより直径3mmのストランド状に成形した。得られたストランド状成形体を長さ1mにカッターで切断した後、ストランド状成形体の反面を加熱したホットプレートに押しあて溶融することにより、反面を平滑にした。
Sample preparation method for light guide performance evaluation A thermoplastic resin is melt-extruded using a short-shaft extruder (screw diameter: 40 mm, extrusion temperature 180-230C), and then cooled (15C) in a water bath. Thus, it was formed into a strand having a diameter of 3 mm. The obtained strand-shaped molded body was cut to a length of 1 m with a cutter, and then the other side of the strand-shaped molded body was pressed against a heated hot plate and melted, thereby smoothing the other side.

導光性評価方法
ストランド状成形体の両端を図1に示すようにクランプで固定した。一方の反面からレーザー(He-Neレーザー、波長:633.2 nm、出力:7.4 mW)を照射、他方の反面から出射される光の強度を検出器により測定した。検出器で測定される光の強度が強いほど導光性が優れることを意味する。
Method for evaluating light guide properties Both ends of the strand-shaped molded body were fixed with clamps as shown in FIG. Laser was irradiated from one side (He-Ne laser, wavelength: 633.2 nm, output: 7.4 mW), and the intensity of light emitted from the other side was measured by a detector. The stronger the light intensity measured by the detector, the better the light guide.

[実施例1]
エチレン・1-ブテン共重合体(三井化学社製、タフマーA−4085S、融点=69℃、密度:885kg/m、MFR(190℃)=3.6g/10min、ショアーD硬度=27)を上記方法により、成形および評価した。結果を表1に示す。
[Example 1]
Ethylene / 1-butene copolymer (Mitsui Chemicals, Tuffmer A-4085S, melting point = 69 ° C., density: 885 kg / m 3 , MFR (190 ° C.) = 3.6 g / 10 min, Shore D hardness = 27) Molding and evaluation were performed by the above method. The results are shown in Table 1.

[実施例2]
エチレン・酢酸ビニル共重合体(三井・デュポンポリケミカル社製、エバフレックスEV270、酢酸ビニル含量:28wt%、融点=72℃、密度:950kg/m、MFR(190℃)=1.0g/10min、ショアーD硬度=24)を上記方法により、成形および評価した。結果を表1に示す。
[Example 2]
Ethylene / vinyl acetate copolymer (Mitsui / DuPont Polychemical Co., Ltd., EVAFLEX EV270, vinyl acetate content: 28 wt%, melting point = 72 ° C., density: 950 kg / m 3 , MFR (190 ° C.) = 1.0 g / 10 min , Shore D hardness = 24) was molded and evaluated by the above method. The results are shown in Table 1.

[実施例3]
アイオノマー樹脂(三井・デュポンポリケミカル社製、ハイミラン1605、イオンタイプ:ナトリウム、融点=92℃、密度:940kg/m、MFR(190℃)=2.8g/10min、ショアーD硬度=66)を上記方法により、成形および評価した。結果を表1に示す。
[Example 3]
Ionomer resin (manufactured by Mitsui DuPont Polychemical Co., Ltd., High Milan 1605, ion type: sodium, melting point = 92 ° C., density: 940 kg / m 3 , MFR (190 ° C.) = 2.8 g / 10 min, Shore D hardness = 66) Molding and evaluation were performed by the above method. The results are shown in Table 1.

[比較例1]
水添スチレン系エラストマー(旭化成社製、タフテックH−1062、SEBS、スチレン含量:18wt%、密度=890kg/m、MFR(230℃)=4.5g/10min、ショアーD硬度=15)を上記方法により、成形および評価した。結果を表1に示す。
[Comparative Example 1]
Hydrogenated styrene elastomer (Asahi Kasei Co., Ltd., Tuftec H-1062, SEBS, styrene content: 18 wt%, density = 890 kg / m 3 , MFR (230 ° C.) = 4.5 g / 10 min, Shore D hardness = 15) Molded and evaluated by the method. The results are shown in Table 1.

[比較例2]
アクリルゴム(クラレ社製、パラペットSA FW−001、密度=1100kg/m、MFR(230℃、10kgf)=14 g/10min、ショアーD硬度=22)を上記方法により、成形および評価した。結果を表1に示す。
[Comparative Example 2]
Acrylic rubber (manufactured by Kuraray Co., Ltd., Parapet SA FW-001, density = 1100 kg / m 3 , MFR (230 ° C., 10 kgf) = 14 g / 10 min, Shore D hardness = 22) was molded and evaluated by the above method. The results are shown in Table 1.

Figure 0005307764
Figure 0005307764

表1において、実施例1〜3と、比較例1〜2の対比において、光の検出強度から明らかなように、特定の物性を有するエチレン共重合体が、特定の物性を有する熱可塑性樹脂に含まれ、かつ該熱可塑性樹脂を導光/発光成形体のコア層に用いることで、柔軟性と透明性、耐熱性を併せ持つ導光/発光成形体よび導光/発光装置を得ることができる。さらに、該エチレン共重合体は、耐候性や耐湿性も有し、生産も比較的容易である。
In Table 1, in comparison between Examples 1 to 3 and Comparative Examples 1 and 2, as is clear from the light detection intensity, an ethylene copolymer having specific physical properties is converted into a thermoplastic resin having specific physical properties. By using the thermoplastic resin in the core layer of the light guide / light emitting molded article, a light guide / light emitting molded article and a light guide / light emitting device having both flexibility, transparency, and heat resistance can be obtained. . Further, the ethylene copolymer has weather resistance and moisture resistance, and is relatively easy to produce.

本発明は、散乱現象を利用して光を任意の方向に向けて出射させる発光成形体として利用が可能である。 The present invention can be used as a light-emitting molded body that emits light in an arbitrary direction by utilizing a scattering phenomenon.

Claims (5)

コア層とクラッド層を含む導光/発光成形体であって、
該コア層が、DSC測定で観察される融解ピーク温度から求められる融点が50〜130℃であって、エチレン/アルファオレフィン共重合体、エチレン/酢酸ビニル共重合体、エチレン/不飽和カルボン酸共重合体、またはエチレン/不飽和カルボン酸共重合体のアイオノマーから選ばれるエチレン共重合体を含み、かつショアーD硬度が10〜80の範囲にある熱可塑性樹脂からなることを特徴とする導光/発光成形体。
A light guide / light emitting molded body including a core layer and a clad layer,
The core layer, the melting point obtained from the melting peak temperature observed in DSC measurement I 50 to 130 ° C. der, ethylene / alpha-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / unsaturated carboxylic acid A light guide comprising an ethylene copolymer selected from a copolymer or an ionomer of an ethylene / unsaturated carboxylic acid copolymer , and comprising a thermoplastic resin having a Shore D hardness of 10 to 80 / Luminescent molded body.
前記クラッド層の屈折率が、前記コア層の屈折率よりも低いことを特徴とする請求項に記載の導光/発光成形体。 The refractive index of the cladding layer, light / emission molded body according to claim 1, characterized in that lower than the refractive index of the core layer. 請求項1〜2のいずれか1項に記載の導光/発光成形体からなる光ファイバー。 Optical fiber comprising a light guide / light emitting molded body according to any one of claims 1-2. 請求項に記載の導光/発光成形体を含む導光/発光装置。 A light guide / light emitting device comprising the light guide / light emitting molded article according to claim 1 . 請求項に記載の光ファイバーとLED光源素子を含むLED発光装置。 The LED light-emitting device containing the optical fiber and LED light source element of Claim 3 .
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