JP2016153200A - Luminous bilayer resin member - Google Patents

Luminous bilayer resin member Download PDF

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JP2016153200A
JP2016153200A JP2015031931A JP2015031931A JP2016153200A JP 2016153200 A JP2016153200 A JP 2016153200A JP 2015031931 A JP2015031931 A JP 2015031931A JP 2015031931 A JP2015031931 A JP 2015031931A JP 2016153200 A JP2016153200 A JP 2016153200A
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surface layer
layer
light
phosphorescent material
phosphorescence
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JP6398099B2 (en
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学方 宋
Gakuho So
学方 宋
真理子 江口
Mariko Eguchi
真理子 江口
純一 西岡
Junichi Nishioka
純一 西岡
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Takiron Co Ltd
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Takiron Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a luminous bilayer resin member emitting visible light (phosphorescence) at high luminance and further free from deterioration in the weatherability of the surface layer caused by a fluorescent brightener.SOLUTION: Provided is a luminous bilayer resin member A provided with: a surface layer 1 made of a synthetic resin containing a luminous material; and a back face layer 2 made of a synthetic resin. The surface layer 1 has light transmissivity, and the back face layer 2 includes a fluorescent brightener. The luminous material of the surface layer 1 absorbs the light of a luminous material excitation region without being checked by a fluorescent brightener, and emits visible light (phosphorescence) in a wavelength region longer than that, and the fluorescent brightener of the back face layer 2 passes through the surface layer 1, absorbs the light of the fluorescent brightener excitation wavelength region emitted to the back face layer 2, and emits the ultraviolet light of the wavelength region or visible light longer than that, and a part thereof is absorbed in the luminous material and doubly excites the luminous material to improve the brightness of the phosphorescence. Since the surface layer does not include a fluorescent brightener, deterioration in weatherability caused by a fluorescent brightener can be suppressed.SELECTED DRAWING: Figure 1

Description

本発明は、床材や避難誘導表示材などの用途に好ましく採用される蓄光性複層樹脂部材に関し、更に詳しくは、高価な蓄光材の使用量を少なくしても高輝度で可視光(りん光)を発光し得る視認性の高い経済的に有利な蓄光性複層樹脂部材に関する。   The present invention relates to a phosphorescent multi-layer resin member that is preferably employed in applications such as flooring and evacuation guidance display materials, and more specifically, high luminance and visible light (phosphorus) even if the amount of expensive phosphorescent material used is reduced. The present invention relates to an economically advantageous phosphorescent multi-layer resin member that can emit light).

従来より、紫外線照射時に任意の有色可視光を発光でき、配合剤量を少量としても十分な輝度を発生すると共に、透明感とクリスタルな装飾性を有し、内部発光により深みのある印象を与えることが可能な蛍光体組成物として、合成樹脂や塗料などの媒体100重量部当たり蛍光増白剤0.05重量部と蛍光顔料0.05重量部以上とを配合した蛍光体組成物が知られている(特許文献1)。   Conventionally, any colored visible light can be emitted when irradiated with ultraviolet rays. Even if the amount of the compounding agent is small, sufficient luminance is generated, and it has a translucency and crystal decoration, giving a deep impression by internal light emission. As a phosphor composition that can be used, a phosphor composition in which 0.05 part by weight of a fluorescent brightening agent and 0.05 part by weight or more of a fluorescent pigment are blended per 100 parts by weight of a medium such as a synthetic resin or paint is known (Patent Document 1).

特開平11−61115号公報JP-A-11-61115

しかしながら、特許文献1のように蛍光増白剤と蛍光顔料を配合した蛍光体組成物は、蛍光増白剤の励起波長領域と蛍光顔料の励起波長領域が全体的又は部分的に重複する場合、蛍光増白剤も蛍光顔料の励起波長領域の光を吸収して蛍光顔料の励起を阻害することになるため、りん光輝度が十分に向上しないという問題があり、しかも、蛍光増白剤によって耐候性と耐汚れが低下するという問題もあった。   However, the phosphor composition in which the fluorescent whitening agent and the fluorescent pigment are blended as in Patent Document 1, the excitation wavelength region of the fluorescent whitening agent and the excitation wavelength region of the fluorescent pigment overlap entirely or partially, The fluorescent whitening agent also absorbs the light in the excitation wavelength region of the fluorescent pigment and inhibits the excitation of the fluorescent pigment, so that there is a problem that the phosphorescence brightness is not sufficiently improved, and the weathering agent has a weather resistance. There was also a problem that the property and stain resistance were lowered.

本発明は上記問題に対処すべくなされたもので、その目的とするところは、高価な蓄光材の使用量を少なくしても高輝度で可視光(りん光)を発光し、しかも蛍光増白剤による表面層の耐候性の低下がない、経済的に有利な視認性の高い蓄光性複層樹脂部材を提供することにある。   The present invention has been made to cope with the above-described problems. The object of the present invention is to emit visible light (phosphorescence) with high brightness even when the amount of expensive phosphorescent material used is reduced, and to achieve fluorescent whitening. An object of the present invention is to provide an economically advantageous high-visibility phosphorescent multilayer resin member in which the weather resistance of the surface layer is not lowered by the agent.

上記目的を達成するため、本発明に係る蓄光性複層樹脂部材は、蓄光材を含有する合成樹脂製の表面層と、合成樹脂製の裏面層とを備えた蓄光性複層樹脂部材であって、表面層が透光性を有し、裏面層が蛍光増白剤を含有することを特徴とするものである。   In order to achieve the above object, a luminous multi-layer resin member according to the present invention is a luminous multi-layer resin member provided with a synthetic resin surface layer containing a luminous material and a synthetic resin back layer. The surface layer has translucency, and the back layer contains a fluorescent brightening agent.

本発明の蓄光性複層樹脂部材においては、裏面層が酸化チタンを含有し、略白色の層であることが好ましい。
そして、裏面層における蛍光増白剤の含有量は、裏面層のマトリックス樹脂100質量部に対して0.1〜5質量部であることが好ましく、裏面層における酸化チタンの含有量は、裏面層のマトリックス樹脂100質量部に対して5〜20質量部であることが好ましい。この蛍光増白剤の分子量は200〜700であることが好ましい。
更に、表面層の波長300〜400nmの光線透過率は30%以上であることが好ましい。
In the phosphorescent multilayer resin member of the present invention, the back layer preferably contains titanium oxide and is a substantially white layer.
And it is preferable that content of the fluorescent whitening agent in a back surface layer is 0.1-5 mass parts with respect to 100 mass parts of matrix resins of a back surface layer, and content of the titanium oxide in a back surface layer is back surface layer. It is preferable that it is 5-20 mass parts with respect to 100 mass parts of matrix resin. The fluorescent whitening agent preferably has a molecular weight of 200 to 700.
Furthermore, the light transmittance at a wavelength of 300 to 400 nm of the surface layer is preferably 30% or more.

本発明の蓄光性複層樹脂部材のように、透明性を有する合成樹脂製の表面層に蓄光材が含有され、合成樹脂製の裏面層に蛍光増白剤が含有されていると、表面層の蓄光材が、表面層に入射した光線のうち蓄光材を励起する波長領域(以下、蓄光材励起波長領域という)の光線を吸収して励起され、蓄光材励起波長領域よりも長波長領域の可視光線(りん光)を出射する。そして、裏面層に含有される蛍光増白剤は、表面層を透過して裏面層に入射した、蛍光増白剤を励起する波長領域(以下、蛍光増白剤励起波長領域という)の光線を吸収して励起され、蛍光増白剤励起波長領域よりも長波長領域の紫外光線ないし可視光線を出射する。このように、本発明の蓄光性複層樹脂部材は、蓄光材と蛍光増白剤を表面層と裏面層に別々に含有させることで、蓄光材励起波長領域と蛍光増白剤励起波長領域とが部分的又は全体的に重複しても、その重複する励起波長領域の光線が表面層を透過する間に蛍光増白剤によって吸収されないようにしてあるため、表面層の蓄光材は蓄光材励起波長領域の光線を蛍光増白剤に阻害されることなく吸収し、十分に励起されてりん光を出射するのでりん光輝度が向上する。そして、表面層の蓄光材から出射される可視光線(りん光)に加えて、裏面層の蛍光増白剤も紫外光線ないし可視光線を出射するので、蓄光性複層樹脂部材全体としてのりん光輝度が一層向上し、特に、蛍光増白剤から出射される紫外光線ないし可視光線の波長領域が蓄光材励起波長領域と重複する場合は、表面層の蓄光材が、表面層に入射した蓄光材励起波長領域の光線と、裏面層の蛍光増白剤から出射される紫外光線ないし可視光線のうち蓄光材励起波長領域と重複する波長領域の光線を吸収して二重に励起されるため、りん光輝度が更に向上する。   When the phosphorescent material is contained in the transparent synthetic resin surface layer and the fluorescent whitening agent is contained in the synthetic resin back surface layer as in the phosphorescent multilayer resin member of the present invention, the surface layer Of the light incident on the surface layer is excited by absorbing the light in the wavelength region that excites the phosphorescent material (hereinafter referred to as the phosphorescent material excitation wavelength region), and has a longer wavelength region than the phosphorescent material excitation wavelength region. Visible light (phosphorescence) is emitted. The fluorescent brightening agent contained in the back surface layer transmits light in a wavelength region (hereinafter referred to as fluorescent whitening agent excitation wavelength region) that passes through the surface layer and enters the back surface layer to excite the fluorescent whitening agent. Absorbed and excited to emit ultraviolet light or visible light having a wavelength longer than that of the fluorescent brightener excitation wavelength. As described above, the phosphorescent multilayer resin member of the present invention contains the phosphorescent material and the fluorescent brightening agent separately in the front surface layer and the back surface layer, so that the phosphorescent material excitation wavelength region and the fluorescent brightener excitation wavelength region are Even if they overlap partially or entirely, the light of the overlapping excitation wavelength region is prevented from being absorbed by the fluorescent whitening agent while passing through the surface layer. The light in the wavelength region is absorbed without being inhibited by the fluorescent brightener, and is sufficiently excited to emit phosphorescence, so that the phosphorescence brightness is improved. In addition to visible light (phosphorescence) emitted from the phosphorescent material on the surface layer, the fluorescent whitening agent on the back layer also emits ultraviolet light or visible light, so that phosphorescence of the phosphorescent multilayer resin member as a whole is achieved. Luminance is further improved, especially when the wavelength region of ultraviolet light or visible light emitted from the fluorescent brightening agent overlaps with the phosphorescent material excitation wavelength region, the phosphorescent material of the surface layer is incident on the surface layer. Since the light in the excitation wavelength region and the ultraviolet light or visible light emitted from the fluorescent whitening agent on the back layer are absorbed in the wavelength region overlapping with the phosphorescent material excitation wavelength region, it is excited twice. The light brightness is further improved.

また、表面層に蓄光材と蛍光増白剤が含有されている場合は、蛍光増白剤によって表面層の耐候性が低下することになる。具体的には、光線に曝された蛍光増白剤の作用で表面層のマトリックス樹脂が黄変するなどして、表面層の光線透過性が低下し、その結果、表面層中に存在する蓄光材に届く蓄光材励起波長領域の光線量が低下してしまうという不具合を生じる。一方、本発明の蓄光性複層樹脂部材のように、蓄光材と蛍光増白剤が表面層と裏面層に別々に含有されていると、表面層の耐候性を低下させる心配はなく、長期にわたって表面層中の蓄光材に届く蓄光材励起波長領域の光線量を確保できる。また、蓄光材と蛍光増白剤が表面層に含有されていると、蛍光増白剤によって表面層が粘着性を呈することが多いため、特に屋外で使用する場合は表面層に汚れが付着して表面層への光線到達を妨げ、蓄光材の励起や発光が阻害されることになるが、本発明の蓄光性複層樹脂部材のように表面層と裏面層に蓄光材と蛍光増白剤が別々に含有されていると、表面層が粘着性を呈することがなく、表面層に汚れが付着し難いので、蓄光材の励起や発光が阻害される心配もない。   Further, when the surface layer contains a phosphorescent material and a fluorescent brightening agent, the weathering resistance of the surface layer is lowered by the fluorescent brightening agent. Specifically, the light-transmitting property of the surface layer decreases due to, for example, yellowing of the matrix resin of the surface layer due to the action of the fluorescent whitening agent exposed to light, and as a result, the phosphorescence existing in the surface layer is reduced. This causes a problem that the amount of light in the phosphorescent material excitation wavelength region that reaches the material decreases. On the other hand, when the phosphorescent material and the fluorescent brightening agent are separately contained in the surface layer and the back surface layer as in the phosphorescent multilayer resin member of the present invention, there is no fear of reducing the weather resistance of the surface layer, and the long term The amount of light in the phosphorescent material excitation wavelength region that reaches the phosphorescent material in the surface layer can be secured. In addition, if the phosphorescent material and the fluorescent brightening agent are contained in the surface layer, the surface layer often becomes sticky due to the fluorescent brightening agent. This prevents light from reaching the surface layer and inhibits excitation and light emission of the phosphorescent material. However, as in the phosphorescent multilayer resin member of the present invention, the phosphorescent material and the fluorescent brightener are formed on the surface layer and the back surface layer. If they are contained separately, the surface layer does not exhibit stickiness, and dirt does not easily adhere to the surface layer, so there is no concern that excitation or light emission of the phosphorescent material is hindered.

本発明の蓄光性複層樹脂部材において、裏面層が酸化チタンを含有した略白色の層であると、表面層の蓄光材から裏面層側に向けて出射された可視光線(りん光)や表面層を透過した全光線が略白色の裏面層によって表面側に反射されるため、蓄光性複層樹脂部材全体としてのりん光輝度が更に向上する。
また、裏面層において蛍光増白剤と酸化チタンが共存すると、後述するように蛍光増白剤から出射される光線の波長領域が短波長側にシフトするため、蛍光増白剤から出射される光線の波長領域と蓄光材励起波長領域との重複領域が広くなり、この重複領域の光線を表面層の蓄光材が吸収して更に強く励起されるので、りん光輝度が一層向上する。
In the phosphorescent multilayer resin member of the present invention, when the back layer is a substantially white layer containing titanium oxide, visible light (phosphorescence) emitted from the phosphor layer of the surface layer toward the back layer side or the surface Since all the light rays that have passed through the layer are reflected to the front surface side by the substantially white back surface layer, the phosphorescence luminance of the phosphorescent multilayer resin member as a whole is further improved.
Further, when the fluorescent whitening agent and titanium oxide coexist in the back layer, the wavelength region of the light emitted from the fluorescent whitening agent shifts to the short wavelength side as will be described later, so that the light emitted from the fluorescent whitening agent. The overlapping region between the wavelength region and the phosphorescent material excitation wavelength region becomes wider, and the phosphorescent material in the surface layer absorbs the light in this overlapping region and is excited more strongly, so that the phosphorescence brightness is further improved.

本発明の蓄光性複層樹脂部材において、裏面層の蛍光増白剤の含有量を、裏面層のマトリックス樹脂100質量部に対し0.1〜5質量部としたものは、蓄光性複層樹脂部材全体としてのりん光輝度を満足に向上させることができる。けれども、蛍光増白剤の含有量が0.1質量部を下回ると、りん光輝度を向上させることが難しくなり、5質量部を上回ると、光は裏面層を透過し易くなって、表層への反射率が低下する。また、後述するように蓄光性複層樹脂部材の耐候性が低下すると共に、りん光輝度を向上させることも難しくなる。   In the phosphorescent multilayer resin member of the present invention, the fluorescent whitening agent content in the back layer is 0.1 to 5 parts by mass with respect to 100 parts by mass of the matrix resin in the back layer. The phosphorescence luminance as a whole member can be improved satisfactorily. However, when the content of the fluorescent brightening agent is less than 0.1 parts by mass, it is difficult to improve the phosphorescence brightness. When the content is more than 5 parts by mass, the light easily passes through the back surface layer and enters the surface layer. The reflectance of is reduced. Further, as will be described later, the weather resistance of the phosphorescent multilayer resin member is lowered, and it is difficult to improve the phosphorescence luminance.

そして、裏面層における酸化チタンの含有量を、裏面層のマトリックス樹脂100質量部に対して5〜20質量部としたものは、蓄光性複層樹脂部材全体としてのりん光輝度を更に向上させることができる。けれども、酸化チタンの含有量が5質量部を下回ると、りん光輝度を向上させることが難しくなり、20質量部を上回ると、蓄光性複層樹脂部材の耐熱性が低下する傾向がみられる。   And what made content of the titanium oxide in a back surface layer 5-20 mass parts with respect to 100 mass parts of matrix resins of a back surface layer further improves the phosphorescence brightness | luminance as the whole luminous multi-layer resin member. Can do. However, when the content of titanium oxide is less than 5 parts by mass, it is difficult to improve phosphorescence luminance. When the content is more than 20 parts by mass, the heat resistance of the phosphorescent multilayer resin member tends to decrease.

また、蛍光増白剤の分子量が200〜700であると、蛍光増白剤が裏面層のマトリックス合成樹脂に容易に分散し、且つ、裏面層から蛍光増白剤がブリードアウトすることもない。けれども、蛍光増白剤の分子量が200を下回ると、裏面層から蛍光増白剤がブリードアウトし易くなり、分子量が700を上回ると、マトリックス樹脂に対する蛍光増白剤の分散性が低下する。   Moreover, when the molecular weight of the fluorescent brightening agent is 200 to 700, the fluorescent brightening agent is easily dispersed in the matrix synthetic resin of the back surface layer, and the fluorescent whitening agent does not bleed out from the back surface layer. However, if the molecular weight of the optical brightener is less than 200, the fluorescent brightener tends to bleed out from the back layer, and if the molecular weight exceeds 700, the dispersibility of the optical brightener in the matrix resin decreases.

更に、表面層を構成するマトリックス樹脂の波長300〜400nmにおける光線透過率が30%以上であると、この300〜400nmの波長領域と蛍光増白剤励起波長領域が重複するため、蛍光増白剤励起波長領域のうちの重複する300〜400nmの波長領域の光線が表面層を30%以上の光線透過率で透過し、裏面層の蛍光増白剤を十分励起して、蛍光増白剤励起波長領域よりも長波長領域の光線を蛍光増白剤から出射するので、蓄光性複層樹脂部材全体としてのりん光輝度を確実に向上させることができる。   Further, when the light transmittance at a wavelength of 300 to 400 nm of the matrix resin constituting the surface layer is 30% or more, the wavelength region of 300 to 400 nm overlaps with the fluorescent whitening agent excitation wavelength region. The overlapping 300-400 nm wavelength region of the excitation wavelength region transmits through the surface layer with a light transmittance of 30% or more, sufficiently excites the fluorescent whitening agent in the back layer, and the fluorescent whitening agent excitation wavelength. Since the light in the wavelength region longer than the region is emitted from the fluorescent brightening agent, the phosphorescence brightness of the entire phosphorescent multilayer resin member can be reliably improved.

本発明の一実施形態に係る蓄光性複層樹脂部材の断面図である。It is sectional drawing of the luminous multi-layer resin member which concerns on one Embodiment of this invention.

以下、本発明の蓄光性複層樹脂部材の好ましい実施形態について詳細に説明する。   Hereinafter, preferred embodiments of the luminous multi-layer resin member of the present invention will be described in detail.

図1は本発明の一実施形態に係る蓄光性複層樹脂部材の断面図であって、この蓄光性複層樹脂部材Aは、合成樹脂製の表面層1と合成樹脂製の裏面層2を備えた二層構造のシート状の部材であり、表面層1には蓄光材が、また、裏面層2には蛍光増白剤が、それぞれ含有されている。   FIG. 1 is a cross-sectional view of a luminous multi-layer resin member according to an embodiment of the present invention. This luminous multi-layer resin member A includes a synthetic resin surface layer 1 and a synthetic resin back layer 2. It is a sheet-like member having a two-layer structure, and the surface layer 1 contains a phosphorescent material, and the back layer 2 contains a fluorescent brightening agent.

蓄光性複層樹脂部材の形状は、この実施形態のような二層構造のシート形状に限定されるものではなく、例えば、内層(裏面層)の表面に外層(表面層)を設けた管形状の部材としたり、芯材層(裏面層)の表面に外層(表面層)を設けた棒形状の部材としたり、中実又は中空の基体層(裏面層)の表面に外層(表面層)を設けた異形状の部材とするなど、所望形状の部材とすることができる。
また、場合によって(とくにシート状の部材である場合)は、表面層1と裏面層2との間に、中間層として、透光性のガラス繊維や合成樹脂繊維からなる織布もしくは不織布などを設けたり、裏面層2に上記繊維や無機充填材を含有させたりすることによって、蓄光性複層樹脂部材Aを補強すると共に、熱伸縮を抑制するようにしてもよい。
The shape of the luminous multi-layer resin member is not limited to the sheet shape of the two-layer structure as in this embodiment, for example, a tube shape in which the outer layer (surface layer) is provided on the surface of the inner layer (back surface layer) Or a rod-shaped member provided with an outer layer (surface layer) on the surface of the core layer (back surface layer), or an outer layer (surface layer) on the surface of a solid or hollow base layer (back surface layer). It can be set as a member of a desired shape, such as an irregularly shaped member provided.
In some cases (especially in the case of a sheet-like member), a woven or non-woven fabric made of translucent glass fiber or synthetic resin fiber is used as an intermediate layer between the front surface layer 1 and the back surface layer 2. While providing the said fiber and an inorganic filler in the back surface layer 2, while reinforcing the luminous multi-layer resin member A, you may make it suppress thermal expansion and contraction.

蓄光性複層樹脂部材Aの表面層1は透光性を有する層であり、このように透光性を有する表面層1を裏面層2の上に積層したため、表面層1に含有される蓄光材が、表面層1を透過する蓄光材励起波長領域の光線により励起されて、蓄光材励起波長領域よりも長波長領域の可視光線(りん光)を出射し、裏面層2に含有される蛍光増白剤が、表面層1を透過して裏面層2に入射した蛍光増白剤励起波長領域の光線により励起されて、蛍光増白剤励起波長領域よりも長波長領域の光線(紫外光線ないし可視光線)を出射するようになっている。   The surface layer 1 of the light-accumulating multilayer resin member A is a light-transmitting layer. Since the surface layer 1 having the light-transmitting property is laminated on the back surface layer 2 in this way, the light storage contained in the surface layer 1 The material is excited by the light in the phosphorescent material excitation wavelength region that passes through the surface layer 1, emits visible light (phosphorescence) in a longer wavelength region than the phosphorescent material excitation wavelength region, and the fluorescence contained in the back layer 2 The brightener is excited by the light in the fluorescent brightener excitation wavelength region that has passed through the surface layer 1 and entered the back layer 2, and light in a wavelength region longer than the fluorescent brightener excitation wavelength region (ultraviolet light or Visible light).

表面層1のマトリックス樹脂としては、例えば、塩化ビニル樹脂や酢酸ビニル樹脂、ポリカーボネート樹脂、ポリオレフィン樹脂などの光学的に透明な熱可塑性樹脂が好ましく、これらの樹脂は単独で使用してもよいし、適宜混合して使用してもよい。また、光学的に透明な公知の熱硬化性樹脂を使用してもよい。
この表面層1のマトリックス樹脂には、蓄光材の他に、透光性の可塑剤や添加剤(例えば、光安定剤、熱安定剤、成形助剤など)が適宜添加される。しかし、表面層1の透光性を阻害する顔料などの着色剤や無機充填剤を添加することは望ましくない。
As the matrix resin of the surface layer 1, for example, an optically transparent thermoplastic resin such as a vinyl chloride resin, a vinyl acetate resin, a polycarbonate resin, or a polyolefin resin is preferable, and these resins may be used alone, You may mix and use it suitably. Moreover, you may use the well-known thermosetting resin optically transparent.
In addition to the phosphorescent material, a translucent plasticizer or additive (for example, a light stabilizer, a heat stabilizer, a molding aid, etc.) is appropriately added to the matrix resin of the surface layer 1. However, it is not desirable to add a colorant such as a pigment or an inorganic filler that hinders the translucency of the surface layer 1.

表面層1に含有させる蓄光材としては、ラジウム系化合物、プロメチウム系化合物、ストロンチウム系化合物、亜鉛系化合物(ZnS系)等が挙げられるが、そのなかでも特に好ましい蓄光材は、ジスプロシウム、ユウロピウムで付活したアルミン酸ストロンチウム(イエローグリーン発色のSrAl:Eu,Dyと、ブルーグリーン発色のSrAl1425:Eu,Dy)である。これらの蓄光材は、単独で又は複数種組み合わせて、表面層1に含有される。
後述の実施例で使用する蓄光材(イエローグリーン発色のSrAl:Eu,Dy)は、蓄光材励起波長領域が250〜450nm(ピーク波長350nm)であり、この波長領域の光線(紫外光線ないし可視光線)を吸収して、人が視認できる波長450〜650nm(ピーク波長525nm)のイエローグリーン発色の可視光線(りん光)を出射することにより、暗所での避難誘導や危険指示を可能とするものである。
Examples of the phosphorescent material to be included in the surface layer 1 include radium compounds, promethium compounds, strontium compounds, zinc compounds (ZnS compounds), and among them, particularly preferred phosphorescent materials are dysprosium and europium. Activated strontium aluminate (yellow green colored SrAl 2 O 4 : Eu, Dy and blue green colored Sr 4 Al 14 O 25 : Eu, Dy). These phosphorescent materials are contained in the surface layer 1 individually or in combination of multiple types.
The phosphorescent material (yellow green colored SrAl 2 O 4 : Eu, Dy) used in the examples described later has a phosphorescent material excitation wavelength region of 250 to 450 nm (peak wavelength 350 nm), and light in this wavelength region (ultraviolet light) By absorbing visible light and emitting visible light (phosphorescent light) of yellow-green color with a wavelength of 450-650 nm (peak wavelength 525 nm) that can be seen by humans, it is possible to guide evacuation and give danger instructions in the dark. It is what.

蓄光材の好ましい平均粒子径は40〜350μmであり、この範囲の平均粒子径であると、後掲の[表2]の試料片No.11、No.4、No.12のように、合格水準以上の高いりん光輝度を得ることができる。しかし、蓄光材の平均粒子径が25μmと小さ過ぎるもの(試料片No.10)や、400μmと大き過ぎるもの(試料片No.13)は、りん光輝度が低下し、合格水準を下回るようになる。また、後掲の[表2]に示すように、蓄光材の平均粒子径が大きいほど、蓄光性複層樹脂部材の耐候性が低下すると共に、蓄光材が脱落し易くなり、平均粒子径が400μm以上と大き過ぎるもの(試料片No.13)は、耐候性が合格水準を下回るだけでなく、蓄光材が容易に脱落するようになる。また、成形時、設備の損傷が激しいなどの問題もある。
蓄光材の更に好ましい平均粒径は50〜300μmである。
The preferable average particle diameter of the phosphorescent material is 40 to 350 μm. When the average particle diameter is in this range, the sample piece No. 11, no. 4, no. As shown in FIG. 12, it is possible to obtain a high phosphorescence luminance exceeding the acceptable level. However, the phosphorescent material having an average particle diameter of 25 μm that is too small (sample piece No. 10) or 400 μm that is too large (sample piece No. 13) is such that the phosphorescence brightness decreases and falls below the acceptable level. Become. In addition, as shown in [Table 2] below, as the average particle diameter of the phosphorescent material increases, the weather resistance of the phosphorescent multilayer resin member decreases, and the phosphorescent material easily falls off. When the sample is too large (sample piece No. 13) of 400 μm or more, not only the weather resistance falls below the acceptable level, but also the phosphorescent material comes off easily. There is also a problem that the equipment is severely damaged during molding.
A more preferable average particle diameter of the phosphorescent material is 50 to 300 μm.

表面層1における蓄光材の含有量は、表面層1のマトリックス樹脂100質量部に対して50〜300質量部であることが好ましく、この範囲内の含有量であると、後掲の[表3]の試料片No.15、No.4、No.16、No.17、No.18のように、合格水準以上のりん光輝度と耐候性を得ることができる。しかし、蓄光材の含有量が25質量部と少な過ぎるもの(試料片No.14)は、りん光輝度も耐候性も大幅に低下して、合格水準を下回るようになる。また、後掲の[表3]に示すように、蓄光性複層樹脂部材の脆さは蓄光材の含有量が多くなるほど増し、蓄光材の含有量が300質量部のもの(No.18)は合格水準をクリアできない。従って、りん光輝度と耐候性に加えて蓄光性複層樹脂部材の脆さまで合格水準をクリアできる蓄光材の更に好ましい含有量は、100〜250質量部である。   The content of the phosphorescent material in the surface layer 1 is preferably 50 to 300 parts by mass with respect to 100 parts by mass of the matrix resin of the surface layer 1, and if the content is within this range, [Table 3 Sample piece No. 15, no. 4, no. 16, no. 17, no. As shown in FIG. 18, phosphorescence brightness and weather resistance exceeding the acceptable level can be obtained. However, when the phosphorescent material content is too small (25 parts by weight) (sample piece No. 14), the phosphorescence brightness and weather resistance are greatly reduced, and the result falls below the acceptable level. Moreover, as shown in [Table 3] below, the brittleness of the phosphorescent multilayer resin member increases as the phosphorescent material content increases, and the phosphorescent material content is 300 parts by mass (No. 18). Can not pass the passing level. Therefore, the more preferable content of the phosphorescent material that can clear the acceptance level up to the brittleness of the phosphorescent multi-layer resin member in addition to the phosphorescence luminance and weather resistance is 100 to 250 parts by mass.

表面層1の蓄光材の好ましい目付量は0.6〜1.8kg/mであり、この範囲内の目付量であれば、後掲の[表4]の試料片No.4、No.20のように、合格水準以上のりん光輝度と耐候性を得ることができる。けれども、蓄光材の目付量が0.5kg/mと少な過ぎるもの(試料片No.19)は、りん光輝度も耐候性もかなり低下して、合格水準を下回るようになる。後掲の[表4]に示すように、蓄光材の目付量が多くなるほど、りん光輝度も耐候性も向上するが、目付量が多過ぎると蓄光材コストが高くなり、そのわりには蓄光材コストに見合うだけの顕著なりん光輝度向上効果や耐候性向上効果が得られないので、目付量の上限を上記のように1.8kg/mとするのが適当である。 The preferred basis weight of the phosphorescent material of the surface layer 1 is 0.6 to 1.8 kg / m 2. If the basis weight is within this range, the sample piece No. 4, no. As in 20, phosphorescence brightness and weather resistance exceeding the acceptable level can be obtained. However, when the basis weight of the phosphorescent material is too small (0.5 kg / m 2 ) (sample piece No. 19), the phosphorescence luminance and the weather resistance are considerably lowered, and become lower than the acceptable level. As shown in [Table 4] below, as the basis weight of the phosphorescent material increases, the phosphorescence brightness and the weather resistance also improve. However, if the basis weight is too large, the phosphorescent material cost increases. Since a remarkable phosphorescence brightness improvement effect and weather resistance improvement effect corresponding to the cost cannot be obtained, it is appropriate that the upper limit of the basis weight is 1.8 kg / m 2 as described above.

後掲の[表5]の試料片No.21、No.4、No.22のように、表面層1の蓄光材の目付量を同一にした場合は、表面層1の厚さが増加するほど、即ち、表面層1における蓄光材の密度が小さくなるほど、りん光輝度が向上したものの、耐候性は低下する。これは、表面層1の厚さの増加により蓄光材の密度が小さくなるにしたがって、蓄光材の粒子と粒子の間隔が広がり、波長300〜700nmの光線(蓄光材に吸収される蓄光材励起波長領域の光線と蓄光材から出射される可視光線)が表面層1を透過し易くなること、及び、表面層1を光線が透過しやすくなることによって、表面層と裏面層を構成するマトリックス樹脂の紫外線による劣化が進むからであると考えられる。   Sample piece No. of [Table 5] mentioned later. 21, no. 4, no. 22, when the basis weight of the phosphorescent material of the surface layer 1 is the same, the phosphorescence luminance increases as the thickness of the surface layer 1 increases, that is, as the density of the phosphorescent material in the surface layer 1 decreases. Although improved, the weather resistance is reduced. This is because as the density of the phosphorescent material decreases as the thickness of the surface layer 1 decreases, the interval between the phosphorescent material particles increases, and light with a wavelength of 300 to 700 nm (the phosphorescent material excitation wavelength absorbed by the phosphorescent material). Of the matrix resin that constitutes the surface layer and the back layer by making it easier for light in the region and visible light emitted from the phosphorescent material) to pass through the surface layer 1 and for facilitating light transmission through the surface layer 1. This is thought to be due to the deterioration caused by ultraviolet rays.

表面層1のマトリックス樹脂に含有させる可塑剤や添加剤(例えば光安定剤、熱安定剤、成形助剤など)は、マトリックス樹脂の透明性を実質的に損なわない透光性のもの使用する必要がある。
塩化ビニル樹脂などのマトリックス樹脂に含有させる可塑剤としては、波長300〜400nm(蓄光材励起波長領域と重複する波長領域)の光線透過率が60%以上で、かつ、波長450〜650nm(蓄光材から出射される可視光線の波長領域)の光線透過率が90%以上である透光性の可塑剤、例えば、共役二重結合を有しないフタル酸系エステルの水添物、アジピン酸系エステル、アジピン酸系ポリエステル、エポキシ系エステル、ポリエーテルエステルなどが好ましく使用される。この中でも、フタル酸系エステルの水添物である、下記の[化1]の構造式で示されるジイソノニル−シクロヘキサン−ジカルボキシレートは、特に好ましく使用される。このジイソノニル−シクロヘキサン−ジカルボキシレートは、BASF社製の「DINCH」(登録商標)の商品名で市販されている。なお、共役二重結合を有するフタル酸系エステル、トリメリット酸系エステル、安息香酸系エステルなどの可塑剤は、紫外線を吸収して、前記波長域の透光性の低下を招き、りん光輝度を低下させるので好ましくない。
このことは、後掲の[表1]における試料片No.5(共役二重結合を有しないフタル酸系エステルの水添物「DINCH」を含有させたもの)と、試料片No.9(共役二重結合を有するフタル酸系エステル「DOP」を含有させたもの)とを対比すれば、「DOP」を含有させた試料片No.9よりも、「DINCH」を含有させた試料片No.5の方が、りん光輝度も耐久性も優れていることから明らかである。
可塑剤の含有量は特に限定されないが、表面層1のマトリックス樹脂100質量部に対して可塑剤を30〜100質量部含有させることが好ましい。
Plasticizers and additives (for example, light stabilizers, heat stabilizers, molding aids, etc.) to be included in the matrix resin of the surface layer 1 need to use light-transmitting materials that do not substantially impair the transparency of the matrix resin. There is.
As a plasticizer to be contained in a matrix resin such as vinyl chloride resin, the light transmittance of a wavelength of 300 to 400 nm (wavelength region overlapping with the phosphorescent material excitation wavelength region) is 60% or more and a wavelength of 450 to 650 nm (phosphorescent material) A light-transmitting plasticizer having a light transmittance of 90% or more, such as a hydrogenated phthalate ester having no conjugated double bond, an adipic acid ester, Adipic acid-based polyester, epoxy-based ester, polyether ester and the like are preferably used. Among these, diisononyl-cyclohexane-dicarboxylate represented by the following structural formula [Chemical Formula 1], which is a hydrogenated product of phthalic acid ester, is particularly preferably used. This diisononyl-cyclohexane-dicarboxylate is commercially available under the trade name “DINCH” (registered trademark) manufactured by BASF. Plasticizers such as phthalic acid ester, trimellitic acid ester and benzoic acid ester having a conjugated double bond absorb ultraviolet rays and cause a decrease in translucency in the above wavelength range, resulting in phosphorescence luminance. Is not preferable.
This is because sample piece No. in [Table 1] described later. 5 (containing a hydrogenated product “DINCH” of a phthalic acid ester not having a conjugated double bond) and a sample piece No. 5 9 (containing phthalic acid ester “DOP” having a conjugated double bond), sample piece No. 9 containing “DOP” was compared. Sample piece No. 9 containing “DINCH” than No. 5 is clear from the fact that phosphorescence luminance and durability are excellent.
Although content of a plasticizer is not specifically limited, It is preferable to contain 30-100 mass parts of plasticizers with respect to 100 mass parts of matrix resins of the surface layer 1.

Figure 2016153200
Figure 2016153200

上記のように、波長300〜400nmの光線透過率が60%以上で、かつ、波長450〜650nmの光線透過率が90%以上である可塑剤は、蓄光材と共に表面層1のマトリックス樹脂に含有させても、可塑剤による蓄光材励起波長領域の光線の吸収が少ないので蓄光材の励起を阻害することが少なく、しかも、蓄光材から出射する可視光線(りん光)を殆ど吸収しないので、りん光輝度を高めるのに有効である。   As described above, the plasticizer whose light transmittance at a wavelength of 300 to 400 nm is 60% or more and whose light transmittance at a wavelength of 450 to 650 nm is 90% or more is contained in the matrix resin of the surface layer 1 together with the phosphorescent material. However, since the absorption of light in the phosphorescent material excitation wavelength region by the plasticizer is small, excitation of the phosphorescent material is hardly inhibited, and visible light (phosphorescence) emitted from the phosphorescent material is hardly absorbed. It is effective for increasing the light brightness.

表面層1のマトリックス樹脂に添加される添加剤である光安定剤としては、例えば、ステアリン酸のバリウム塩・亜鉛塩などの金属石鹸が好ましく使用され、紫外線を吸収するヒンダードアミン系の光安定材などは使用できない。
また、添加剤である熱安定剤としては、例えば、透明性が良いエポキシ系熱安定剤などが好ましく使用される。
光安定剤や熱安定剤などの添加剤の添加量は少量でよく、例えば、表面層1のマトリックス樹脂100質量部に対して10質量部以下の添加量とすれば十分である。
As a light stabilizer which is an additive added to the matrix resin of the surface layer 1, for example, a metal soap such as a barium salt or zinc salt of stearic acid is preferably used, and a hindered amine light stabilizer that absorbs ultraviolet rays, etc. Cannot be used.
Moreover, as a heat stabilizer which is an additive, for example, an epoxy heat stabilizer having good transparency is preferably used.
The addition amount of additives such as a light stabilizer and a heat stabilizer may be small, for example, an addition amount of 10 parts by mass or less with respect to 100 parts by mass of the matrix resin of the surface layer 1 is sufficient.

表面層1は、蛍光増白剤励起波長領域と重複する波長300〜400nmの光線透過率が30%以上であることが好ましい。このようにすると、蛍光増白剤励起波長領域と重複する300〜400nmの波長領域の光線が表面層1を30%以上の光線透過率で透過し、裏面層2に含有される蛍光増白剤を十分励起して、蛍光増白剤励起波長領域より長波長領域の光線を蛍光増白剤から出射するので、蓄光性複層樹脂部材全体としてのりん光輝度を確実に向上させることができる。   The surface layer 1 preferably has a light transmittance of a wavelength of 300 to 400 nm overlapping with the fluorescent brightener excitation wavelength region of 30% or more. In this way, light in the wavelength region of 300 to 400 nm overlapping with the fluorescent whitening agent excitation wavelength region is transmitted through the surface layer 1 with a light transmittance of 30% or more, and the fluorescent whitening agent contained in the back surface layer 2 Is sufficiently excited to emit light having a wavelength longer than that of the fluorescent brightener excitation wavelength region from the fluorescent brightener, so that the phosphorescence brightness of the entire phosphorescent multilayer resin member can be reliably improved.

表面層1の厚さは特に限定されないが、0.5〜3mmの厚さとするのが適当である。   The thickness of the surface layer 1 is not particularly limited, but is suitably 0.5 to 3 mm.

一方、蓄光性複層樹脂部材Aの裏面層2は透光性が要求されない層であり、この裏面層2のマトリックス樹脂には、蛍光増白剤の他に、可塑剤、無機充填剤、顔料、添加剤(例えば、光安定剤、熱安定剤、成形助剤など)等が適宜含有される。
裏面層2のマトリックス樹脂としては、前述した表面層1のマトリックス樹脂と同種又は異種の熱可塑性樹脂や熱硬化性樹脂が使用される。
On the other hand, the back layer 2 of the phosphorescent multi-layer resin member A is a layer that does not require translucency, and the matrix resin of the back layer 2 includes a plasticizer, an inorganic filler, and a pigment in addition to the fluorescent brightening agent. , Additives (for example, light stabilizers, heat stabilizers, molding aids, etc.) and the like are appropriately contained.
As the matrix resin of the back surface layer 2, the same type or different type of thermoplastic resin or thermosetting resin as the matrix resin of the surface layer 1 described above is used.

裏面層2に含有させる蛍光増白剤としては、オキサゾール系、クマリン系、トリアゾール系、ビラゾロン系、ナフタルイミド系などの蛍光増白剤が挙げられるが、これらの中では、オキサゾール系蛍光増白剤である2,5−チオフェンジイルビス(5−tert−ブチル−1,3−ベンゾキサゾール)が特に好ましく使用される。その構造式を下記の[化2]に示す。   Examples of the fluorescent whitening agent to be included in the back layer 2 include oxazole-based, coumarin-based, triazole-based, virazolone-based, naphthalimide-based fluorescent whitening agents. Among these, oxazole-based fluorescent whitening agents are included. 2,5-thiophenediylbis (5-tert-butyl-1,3-benzoxazole) is particularly preferably used. Its structural formula is shown in [Chemical Formula 2] below.

Figure 2016153200
Figure 2016153200

このオキサゾール系蛍光増白剤は、波長320〜400nm(ピーク波長370nm)の紫外光線を吸収して励起され、波長400〜460nm(ピーク波長430nm)の紫青から青緑の可視光線を出射するものであるが、後述するように、このオキサゾール系蛍光増白剤と酸化チタン(白色系顔料)が共存して複合体化すると、吸収する波長領域も、出射する波長領域も、短波長側にシフトし、波長250〜350nm(ピーク波長280nm)の紫外光線を吸収して、波長350〜450nm(ピーク波長405nm)の紫外光線ないし可視光線を出射する。   This oxazole fluorescent whitening agent is excited by absorbing ultraviolet light having a wavelength of 320 to 400 nm (peak wavelength: 370 nm) and emitting visible light from purple blue to blue-green having a wavelength of 400 to 460 nm (peak wavelength: 430 nm). However, as will be described later, when this oxazole fluorescent whitening agent and titanium oxide (white pigment) coexist to form a composite, both the wavelength region to be absorbed and the wavelength region to be emitted are shifted to the short wavelength side. Then, ultraviolet rays having a wavelength of 250 to 350 nm (peak wavelength 280 nm) are absorbed, and ultraviolet rays or visible rays having a wavelength of 350 to 450 nm (peak wavelength 405 nm) are emitted.

蛍光増白剤は200〜700の分子量を有するものが好ましく、この範囲の分子量を有する蛍光増白剤は、裏面層2のマトリックス樹脂に容易に分散し、且つ、裏面層2からブリードアウトし難いという利点がある。しかし、分子量が200を下回ると、裏面層2から蛍光増白剤がブリードアウトし易くなり、また、分子量が700を上回ると、マトリックス樹脂に対する蛍光増白剤の分散性が低下するという不都合を生じる。ちなみに、上記のオキサゾール系蛍光増白剤である2,5−チオフェンジイルビス(5−tert−ブチル−1,3−ベンゾキサゾール)の分子量は318であるので、裏面層2の塩化ビニル樹脂などのマトリックス樹脂に容易かつ均一に分散し、裏面層2からブリードアウトすることも殆どない。なお、低分子量の蛍光増白剤の例としては、下記[化3]に示すウンベリフェロンなどが挙げられる。   The fluorescent whitening agent preferably has a molecular weight of 200 to 700, and the fluorescent whitening agent having a molecular weight in this range is easily dispersed in the matrix resin of the back layer 2 and hardly bleeds out from the back layer 2. There is an advantage. However, when the molecular weight is less than 200, the fluorescent whitening agent tends to bleed out from the back layer 2, and when the molecular weight exceeds 700, the dispersibility of the fluorescent whitening agent with respect to the matrix resin is reduced. . Incidentally, since the molecular weight of 2,5-thiophenediylbis (5-tert-butyl-1,3-benzoxazole), which is the above oxazole-based fluorescent brightening agent, is 318, the vinyl chloride resin of the back layer 2, etc. It is easily and uniformly dispersed in the matrix resin, and hardly bleeds out from the back surface layer 2. Examples of the low-molecular-weight fluorescent whitening agent include umbelliferone represented by [Chemical Formula 3] below.

Figure 2016153200
Figure 2016153200

蛍光増白剤の含有量は、裏面層2のマトリックス樹脂100質量部に対して0.1〜5質量部とすることが好ましく、この範囲の含有量であると、後掲の[表1]の試料片No.3、No.4、No.5、No.6のように、合格水準以上のりん光輝度と耐候性を得ることができる。けれども、後掲の[表1]に示すように、蛍光増白剤を含有しないもの(試料片No.1、No.2)はりん光輝度が合格水準を下回り、蛍光増白剤が8質量部と多過ぎるもの(試料片No.7)はりん光輝度も耐候性も合格水準を下回るようになる。
蛍光増白剤の更に好ましい含有量は0.5〜3質量部であり、この範囲内の含有量であるもの(試料No.3、No.4、No.5)は、後掲の[表1]に示すように、りん光輝度も耐候性も良好である。
The content of the fluorescent brightening agent is preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the matrix resin of the back layer 2, and the content within this range is shown in [Table 1] below. Sample piece No. 3, no. 4, no. 5, no. As shown in FIG. 6, phosphorescence brightness and weather resistance exceeding the acceptable level can be obtained. However, as shown in [Table 1] below, those that do not contain a fluorescent brightening agent (sample pieces No. 1 and No. 2) have phosphorescence below the acceptable level, and 8 wt. When the amount is too much (sample piece No. 7), the phosphorescence brightness and the weather resistance are below the acceptable level.
The more preferable content of the fluorescent brightening agent is 0.5 to 3 parts by mass, and the contents within this range (sample No. 3, No. 4, No. 5) are described in [Tables]. As shown in 1], the phosphorescence brightness and the weather resistance are good.

上記のように、蛍光増白剤が裏面層2に含有されていると、表面層1を透過して裏面層2に入射した蛍光増白剤励起波長領域の光線を蛍光増白剤が吸収して励起され、蛍光増白剤励起波長領域よりも長波長領域の紫外光線ないし可視光線を出射するので、蓄光性複層樹脂部材A全体としてのりん光輝度が向上する。そして、表面層1の蓄光材が、表面層1に入射した蓄光材励起波長領域の光線に加えて、蛍光増白剤から出射された光線のうち蓄光材励起波長領域の光線をも吸収して二重に励起されるため、りん光輝度が更に向上する。また、蛍光増白剤が裏面層2に含有されていると、蛍光増白剤が表面層1に含有されている場合のように、蓄光増白剤が蓄光材励起波長領域の光線を吸収して蓄光材の励起を阻害することがなく、また、蛍光増白剤によって表面層1の耐候性が低下したり、表面層1が粘着性を呈して汚れが付着することも防止できるようになる。
蛍光増白剤が表面層1に含有されていると、蓄光材の励起が阻害されてりん光輝度が低下し、耐候性も低下する。このことは、後掲の[表1]における試料片No.5(蛍光増白剤を裏面層に含有させたもの)と、試料片No.8(蛍光増白剤を表面層に含有させたもの)とを対比すれば明らかである。
As described above, when the fluorescent whitening agent is contained in the back surface layer 2, the fluorescent whitening agent absorbs the light in the fluorescent whitening agent excitation wavelength region that has passed through the surface layer 1 and entered the back surface layer 2. As a result, the phosphorescent brightness of the phosphorescent multi-layer resin member A as a whole is improved. And in addition to the light in the phosphorescent material excitation wavelength region incident on the surface layer 1, the phosphorescent material in the surface layer 1 absorbs the light in the phosphorescent material excitation wavelength region among the rays emitted from the fluorescent brightener. Since it is excited twice, the phosphorescence brightness is further improved. Further, when the fluorescent whitening agent is contained in the back surface layer 2, the luminous whitening agent absorbs light in the phosphorescent material excitation wavelength region as in the case where the fluorescent whitening agent is contained in the surface layer 1. Thus, the excitation of the phosphorescent material is not hindered, and the weathering resistance of the surface layer 1 is reduced by the fluorescent brightening agent, and the surface layer 1 can be prevented from exhibiting adhesiveness and being attached with dirt. .
When the fluorescent whitening agent is contained in the surface layer 1, excitation of the phosphorescent material is inhibited, phosphorescence luminance is lowered, and weather resistance is also lowered. This is because sample piece No. in [Table 1] described later. 5 (one containing a fluorescent brightening agent in the back layer) and sample no. This is clear when compared with 8 (fluorescent brightener contained in the surface layer).

裏面層2は、白色系顔料として酸化チタンを含有させることにより、略白色の層とすることが好ましく、そのようにすると、表面層1の蓄光材から裏面層2側に出射された可視光線(りん光)が略白色の裏面層2によって表面側に反射されるため、蓄光性複層樹脂部材A全体としてのりん光輝度が更に向上する。このことは、後掲の[表1]における試料片No.1(裏面層に酸化チタンが含有されていないもの)のりん光輝度と、試料片No.2(裏面層に酸化チタンが含有されているもの)のりん光輝度を対比すれば明らかである。   The back surface layer 2 is preferably a substantially white layer by containing titanium oxide as a white pigment. By doing so, visible light (from the phosphorescent material of the surface layer 1 to the back surface layer 2 side) ( (Phosphorescence) is reflected to the front surface side by the substantially white back surface layer 2, so that the phosphorescence luminance of the phosphorescent multilayer resin member A as a whole is further improved. This is because sample piece No. in [Table 1] described later. No. 1 (the back layer does not contain titanium oxide) and the sample no. It is clear if the phosphorescent brightness of 2 (thickness containing titanium oxide in the back layer) is compared.

また、裏面層2において蛍光増白剤と酸化チタンが共存すると、前述したように、蛍光増白剤から出射される光線の波長領域が短波長側にシフトする(オキサゾール系蛍光増白剤では波長350〜450nmにシフトする)ため、蛍光増白剤から出射される光線の波長領域全体が蓄光材励起波長領域(SrAl:Eu,Dyでは波長250〜450nm)と重複するようになり、この蛍光増白剤から出射される重複波長領域の光線を表面層1の蓄光材が吸収して二重に励起されるので、りん光輝度が一層向上するようになる。 In addition, when the fluorescent whitening agent and titanium oxide coexist in the back layer 2, as described above, the wavelength region of the light emitted from the fluorescent whitening agent is shifted to the short wavelength side (the wavelength of the oxazole fluorescent whitening agent is Therefore, the entire wavelength region of the light emitted from the fluorescent brightener overlaps with the phosphorescent material excitation wavelength region (wavelength 250 to 450 nm for SrAl 2 O 4 : Eu, Dy), Since the phosphorescent material of the surface layer 1 absorbs the light in the overlapping wavelength region emitted from the fluorescent brightener and is excited twice, the phosphorescence brightness is further improved.

酸化チタンの含有量は、裏面層2のマトリックス樹脂100質量部に対して5〜20質量部とすることが好ましく、この範囲内で酸化チタンを含有させると、後掲の[表6]の試料片No.24、No.4、No.25、No.26のように、合格水準以上のりん光輝度と耐候性を得ることができる。けれども、酸化チタンの含有量が3質量部と少な過ぎるもの(試料片No.23)は、りん光輝度も耐候性も合格水準を下回る。また、酸化チタンの含有量が20質量部のもの(試料片No.26)は、りん光輝度も耐候性も合格水準以上であるが、耐熱性が合格水準を下回るようになるので、耐熱性も合格水準以上とするために、酸化チタンの含有量を5〜15質量部とすることが更に好ましい。後掲の[表6]に示すように、耐候性は酸化チタンの含有量が増加するにつれて向上し、耐熱性は酸化チタンの含有量が増加するにつれて低下する。   The content of titanium oxide is preferably 5 to 20 parts by mass with respect to 100 parts by mass of the matrix resin of the back layer 2, and when titanium oxide is contained within this range, the sample shown in [Table 6] described later. Piece no. 24, no. 4, no. 25, no. As in the case of No. 26, phosphorescence luminance and weather resistance exceeding the acceptable level can be obtained. However, when the content of titanium oxide is too small as 3 parts by mass (sample piece No. 23), both phosphorescence luminance and weather resistance are lower than the acceptable level. In addition, when the content of titanium oxide is 20 parts by mass (sample piece No. 26), the phosphorescence brightness and weather resistance are above the acceptable level, but the heat resistance becomes lower than the acceptable level. In order to make more than the acceptable level, the content of titanium oxide is more preferably 5 to 15 parts by mass. As shown in [Table 6] below, the weather resistance increases as the titanium oxide content increases, and the heat resistance decreases as the titanium oxide content increases.

裏面層2に含有させる充填剤としては、炭酸塩(炭酸カルシウム等)、珪酸塩(珪酸カルシウム等)、珪酸などの白色系の無機充填剤が好ましく使用される。黒色系や濃色系の充填剤は、裏面層2の光線反射を損ない、表面層1の蓄光材から裏面層2側に出射された光線の反射が不充分になって、りん光輝度が向上し難くなるので、好ましくない。裏面層2に充填剤を含有させると、その増量効果によって裏面層2のマトリックス樹脂の使用量が相対的に少なくなるので、経済的に有利である。
充填剤の含有量は特に限定されないが、裏面層2のマトリックス樹脂100質量部に対して100〜300質量部含有させることが好ましい。100質量部未満では光が裏面層を透過し、充填剤による増量効果も不充分であり、一方、300質量部を超えると、酸化チタンが炭酸カルシウムに囲まれて酸化チタンの効果が低下し、また、裏面層2が脆弱化するからである。
As the filler to be contained in the back layer 2, a white inorganic filler such as carbonate (calcium carbonate or the like), silicate (calcium silicate or the like), silicic acid or the like is preferably used. The black or dark color filler impairs the light reflection of the back layer 2 and the reflection of light emitted from the phosphorescent material of the surface layer 1 to the back layer 2 side is insufficient, improving the phosphorescence brightness. Since it becomes difficult to do, it is not preferable. When the back layer 2 contains a filler, the amount of the matrix resin used in the back layer 2 is relatively reduced due to the effect of increasing the amount, which is economically advantageous.
Although content of a filler is not specifically limited, It is preferable to make it contain 100-300 mass parts with respect to 100 mass parts of matrix resins of the back surface layer 2. FIG. If the amount is less than 100 parts by mass, the light is transmitted through the back layer, and the effect of increasing the amount by the filler is insufficient. On the other hand, if the amount exceeds 300 parts by mass, the titanium oxide is surrounded by calcium carbonate, and the effect of titanium oxide is reduced. Moreover, it is because the back surface layer 2 becomes weak.

裏面層2に添加する光安定剤としては、前述の表面層1に添加する光安定剤と同じもの、つまりステアリン酸のバリウム塩・亜鉛塩などの金属石鹸が好ましく使用される。この光安定剤の含有量は少量でよく、裏面層2のマトリックス樹脂100質量部に対して5質量部以下の添加量とすれば十分である。
なお、裏面層2には、前述した熱安定剤を添加してもよいし、添加しなくてもよい。
As the light stabilizer to be added to the back surface layer 2, the same light stabilizer to be added to the surface layer 1, that is, a metal soap such as barium salt or zinc salt of stearic acid is preferably used. The light stabilizer may be contained in a small amount, and an addition amount of 5 parts by mass or less with respect to 100 parts by mass of the matrix resin of the back layer 2 is sufficient.
In addition, the heat stabilizer mentioned above may be added to the back surface layer 2, and it is not necessary to add it.

裏面層2の厚さは特に限定されないが、表面層1と同様の厚さ、即ち、0.5〜3mmの厚さとするのが好ましい。   Although the thickness of the back surface layer 2 is not specifically limited, It is preferable to set it as the thickness similar to the surface layer 1, ie, the thickness of 0.5-3 mm.

蓄光性複層樹脂部材Aの製造は、マトリックス樹脂に蓄光材などを配合した表面層形成用組成物と、マトリックス樹脂に蛍光増白剤、酸化チタンなどの配合した裏面層形成用組成物を調製し、これらの組成物を用いて、粉体成形、カレンダー成形、押出成形、又はそれらの組み合わせにより、表面層1と裏面層2を別々に形成して積層一体化するか、或いは、積層した状態で同時に成形するなど、所望の方法で製造すればよい。   The production of phosphorescent multi-layer resin member A involves preparing a composition for forming a surface layer in which a phosphorescent material is blended in a matrix resin, and a composition for forming a back layer in which a fluorescent whitening agent, titanium oxide and the like are blended in a matrix resin. Then, using these compositions, the surface layer 1 and the back surface layer 2 are separately formed by powder molding, calender molding, extrusion molding, or a combination thereof, and laminated or integrated, or a laminated state It may be manufactured by a desired method such as molding at the same time.

以上のような構成の蓄光性複層樹脂部材Aは、表面層1に蓄光材が含有され、裏面層2に蛍光増白剤が含有されているので、表面層1の蓄光材が、表面層1に入射した光線のうち蓄光材励起波長領域の光線を吸収して励起され、蓄光材励起波長領域よりも長波長領域の可視光線(りん光)を出射すると共に、裏面層2の蛍光増白剤が、表面層1を透過して裏面層2に入射した蛍光増白剤励起波長領域の光線を吸収して励起され、蛍光増白剤励起波長領域よりも長波長領域の紫外光線ないし可視光線を出射する。この蓄光性複層樹脂部材Aは、上記のように蓄光材と蛍光増白剤を表面層1と裏面層2に別々に含有させることで、蓄光材励起波長領域と蛍光増白剤励起波長領域とが部分的又は全体的に重複する場合でも、その重複する励起波長領域の光線が表面層1を透過する間に蛍光増白剤によって吸収されないようにしてあるため、表面層1の蓄光材は蓄光材励起波長領域の光線を蛍光増白剤に阻害されることなく吸収し、十分に励起されてりん光を出射するのでりん光輝度が向上する。そして、表面層1の蓄光材から出射される可視光線(りん光)に加えて、裏面層2の蛍光増白剤も蛍光増白剤励起波長領域より長波長領域の紫外光線ないし可視光線を出射するので、蓄光性複層樹脂部材A全体としてのりん光輝度が一層向上し、特に、蛍光増白剤から出射される光線の波長領域が蓄光材励起波長領域と重複する場合は、表面層1の蓄光材が、表面層1に入射した蓄光材励起波長領域の光線と、裏面層2の蛍光増白剤から出射された重複波長領域の光線を吸収して二重に励起されるため、りん光輝度が更に向上する。   In the phosphorescent multi-layer resin member A having the above-described configuration, the phosphorescent material is contained in the surface layer 1 and the fluorescent whitening agent is contained in the back surface layer 2, so that the phosphorescent material of the surface layer 1 is the surface layer. 1 is absorbed by the light in the phosphorescent material excitation wavelength region, and emits visible light (phosphorescence) in a longer wavelength region than the phosphorescent material excitation wavelength region, and the fluorescent whitening of the back layer 2 The agent is excited by absorbing the light in the fluorescent whitening agent excitation wavelength region that has passed through the surface layer 1 and entered the back surface layer 2, and is ultraviolet or visible light in the longer wavelength region than the fluorescent whitening agent excitation wavelength region. Is emitted. This phosphorescent multilayer resin member A contains the phosphorescent material and the fluorescent whitening agent separately in the surface layer 1 and the back surface layer 2 as described above, so that the phosphorescent material excitation wavelength region and the fluorescent whitening agent excitation wavelength region are included. Are partially or wholly overlapped, the light in the overlapping excitation wavelength region is not absorbed by the fluorescent whitening agent while passing through the surface layer 1, so that the phosphorescent material of the surface layer 1 is Light in the phosphorescent material excitation wavelength region is absorbed without being inhibited by the fluorescent brightening agent, and is sufficiently excited to emit phosphorescence, so that phosphorescence brightness is improved. In addition to visible light (phosphorescence) emitted from the phosphorescent material of the surface layer 1, the fluorescent whitening agent of the back layer 2 also emits ultraviolet light or visible light in a longer wavelength region than the fluorescent whitening agent excitation wavelength region. Therefore, the phosphorescence brightness of the phosphorescent multilayer resin member A as a whole is further improved. In particular, when the wavelength region of the light emitted from the fluorescent brightener overlaps with the phosphorescent material excitation wavelength region, the surface layer 1 The phosphorescent material absorbs the light in the phosphorescent material excitation wavelength region incident on the front surface layer 1 and the light in the overlapping wavelength region emitted from the fluorescent whitening agent in the back surface layer 2 and is excited twice. The light brightness is further improved.

また、この蓄光性複層樹脂部材Aのように、蓄光材と蛍光増白剤が表面層1と裏面層2に別々に含有されていると、表面層に蓄光材と蛍光増白剤が一緒に含有されている場合のように、表面層1の耐候性が低下する心配がなく、しかも、表面層1が粘着性を呈しないので、表面層1に汚れが付着して蓄光材の励起や発光が阻害される心配もない。
更に、この蓄光性複層樹脂部材Aのように、裏面層2が酸化チタンを含有した略白色の層であると、表面層1の蓄光材から裏面層側に出射された可視光線(りん光)が略白色の裏面層2によって表面側に反射されるため、りん光輝度が一層向上し、しかも、裏面層2において蛍光増白剤と酸化チタンが共存すると、蛍光増白剤から出射される光線の波長領域が短波長側にシフトして蓄光材励起波長領域と全体的に重複し、この重複領域の光線を表面層1の蓄光材が吸収して更に強く励起されるので、りん光輝度が一層向上する。
Moreover, when the phosphorescent material and the fluorescent whitening agent are separately contained in the surface layer 1 and the back surface layer 2 as in the phosphorescent multilayer resin member A, the phosphorescent material and the fluorescent whitening agent are together in the surface layer. There is no concern that the weather resistance of the surface layer 1 is lowered as in the case where it is contained in the surface layer 1, and the surface layer 1 does not exhibit tackiness. There is no worry about the luminescence being disturbed.
Further, when the back surface layer 2 is a substantially white layer containing titanium oxide as in the phosphorescent multilayer resin member A, visible light (phosphorescence) emitted from the phosphorescent material of the surface layer 1 to the back surface layer side. ) Is reflected to the front surface side by the substantially white back surface layer 2, so that the phosphorescence brightness is further improved, and when the fluorescent whitening agent and titanium oxide coexist in the back surface layer 2, the light is emitted from the fluorescent whitening agent. Since the wavelength region of the light beam shifts to the short wavelength side and overlaps with the phosphorescent material excitation wavelength region as a whole, and the phosphorescent material of the surface layer 1 absorbs the light in this overlapping region and is further excited, phosphorescence luminance Is further improved.

次に、本発明の更に具体的な実施例と比較例を挙げて説明する。   Next, more specific examples and comparative examples of the present invention will be described.

[実施例]
下記[表1]に示す組成の表面層用組成物と裏面層用組成物を調製し、厚さ1.5mmの表面層用シートと厚さ1.5mmの裏面層用シートを成形すると共に、両シートを積層して蓄光性複層樹脂部材の試料片No.3〜No.7、試料片No.9を作製した。
これらの試料片について、JIS Z 9107 りん光輝度の測定法に準じて2時間後のりん光輝度を測定し、更に、メタルハライドランプ方式による促進耐候試験を行い、各暴露時間での変色の度合いをブランク品と目視対比し、明らかな変色のない時間を測定値とする方法で耐候性を測定した。その結果を下記[表1]に示す。
[比較例]
比較のために、上記と同様の製法で、裏面層に蛍光増白剤も酸化チタンも含有しない試料片No.1と、裏面層に蛍光増白剤を含有しない試料片No.2と、表面層に蛍光増白剤を含有する試料片No.8を作製し、上記と同様に2時間後のりん光輝度と耐候性を測定した。その結果を下記[表1]に示す。
[Example]
While preparing the composition for the surface layer and the composition for the back surface layer of the composition shown in [Table 1] below, forming the sheet for the surface layer having a thickness of 1.5 mm and the sheet for the back surface layer having a thickness of 1.5 mm, Both sheets were laminated to obtain a sample piece No. 3-No. 7. Sample piece no. 9 was produced.
These sample pieces were measured for phosphorescence brightness after 2 hours according to JIS Z 9107 phosphorescence brightness measurement method, and further subjected to accelerated weathering test by metal halide lamp method to determine the degree of discoloration at each exposure time. The weather resistance was measured by a method in which the measured value was a time without any obvious discoloration as compared with the blank product. The results are shown in [Table 1] below.
[Comparative example]
For comparison, a sample piece No. 2 containing neither a fluorescent brightening agent nor titanium oxide in the back layer was produced by the same production method as described above. 1 and sample piece No. 1 containing no optical brightener in the back layer. 2 and sample piece No. 2 containing a fluorescent brightener in the surface layer. 8 was prepared, and phosphorescence luminance and weather resistance after 2 hours were measured in the same manner as described above. The results are shown in [Table 1] below.

Figure 2016153200
Figure 2016153200

この表1を見ると、表面層のPVC樹脂100質量部に対して蓄光材(SrAl)を150質量部含有させ、裏面層のPVC樹脂100質量部に対してオキサゾール系の蛍光増白剤[2,5−チオフェンジイルビス(5−tert−ブチル−1,3−ベンゾキサゾール)]を0.5〜5質量部、酸化チタンを10質量部含有させた試料片No.3〜No.6は、いずれも2時間後のりん光輝度が合格水準の70mcd/cm以上、耐候性が合格水準の140hr以上であり、りん光輝度も耐候性も向上していることが判る。
これに対し、裏面層に蛍光増白剤も酸化チタンも含有されない比較用の試料片No.1は、2時間後のりん光輝度が55mcd/mと悪く、また、裏面層に蛍光増白剤を含有させないで酸化チタンを含有させた比較用の試料片No.2は、試料片No.1に比べると、りん光輝度が69mcd/mと大幅に向上するが、それでも合格水準(70mcd/m)に達しない。
更に、蛍光増白剤を裏面層に含有させないで表面層に2.5質量部含有させた比較用の試料片No.8と、裏面層に蛍光増白剤を2.5質量部含有させた試料片No.5を対比すると、両者は蛍光増白剤の含有量が同じであるにも拘わらず、前者の試料片No.8はりん光輝度が65mcd/mと低く、合格水準を下回っている。これは、表面層に含有される蛍光増白剤が蓄光材励起波長領域の光線を吸収して、蓄光材の励起を阻害するからである。
以上のことから、蛍光増白剤を裏面層に含有させることは、蓄光性複層樹脂部材のりん光輝度を向上させるために必須であることが判る。
但し、裏面層における蛍光増白剤の含有量が8質量部と多過ぎる試料No.7は、りん光輝度も耐候性も低下して合格水準を下回るようになり、また、試料片No.2〜No.7のように、蛍光増白剤の含有量の増加に伴って耐候性も低下することから、裏面層における蛍光増白剤の含有量は0.1〜5質量部とするのが好ましく、そのなかでも、りん光輝度と耐候性の成績が良い試料片No.3〜No.6が包含される0.5〜3質量部の範囲内とするのが更に好ましいことが判る。
Looking at Table 1, 150 parts by mass of a phosphorescent material (SrAl 2 O 4 ) is contained with respect to 100 parts by mass of the PVC resin of the surface layer, and oxazole-based fluorescent whitening is performed with respect to 100 parts by mass of the PVC resin of the back layer. Sample piece No. 5 containing 0.5 to 5 parts by mass of the agent [2,5-thiophenediylbis (5-tert-butyl-1,3-benzoxazole)] and 10 parts by mass of titanium oxide. 3-No. No. 6 shows that phosphorescence brightness after 2 hours is 70 mcd / cm 2 or more, which is an acceptable level, and weather resistance is 140 hours or more, which is an acceptable level, and both phosphorescence brightness and weather resistance are improved.
On the other hand, a comparative sample piece No. 2 containing neither a fluorescent brightener nor titanium oxide in the back layer. No. 1 had a phosphorescence luminance of 55 mcd / m 2 after 2 hours, and a comparative sample piece No. 1 containing titanium oxide without containing a fluorescent brightening agent in the back layer. 2 is a sample piece No. Compared to 1, although greatly improved phosphorus light intensity is the 69mcd / m 2, but still does not reach the acceptable level (70mcd / m 2).
Further, a comparative sample piece No. 1 containing 2.5 parts by mass in the surface layer without including the fluorescent whitening agent in the back surface layer. 8 and sample piece No. 2 containing 2.5 parts by mass of a fluorescent brightening agent in the back layer. In contrast, the former sample piece No. 5 was used in spite of having the same fluorescent whitening agent content. No. 8 has a low phosphorescence luminance of 65 mcd / m 2, which is below the acceptable level. This is because the fluorescent whitening agent contained in the surface layer absorbs light in the phosphorescent material excitation wavelength region and inhibits excitation of the phosphorescent material.
From the above, it can be seen that the inclusion of the fluorescent brightening agent in the back surface layer is essential for improving the phosphorescence luminance of the phosphorescent multilayer resin member.
However, the content of the fluorescent brightener in the back surface layer was too much as 8 parts by mass. No. 7 falls below the acceptance level due to a decrease in phosphorescence brightness and weather resistance. 2-No. As shown in FIG. 7, since the weather resistance decreases with an increase in the content of the fluorescent brightening agent, the content of the fluorescent brightening agent in the back layer is preferably 0.1 to 5 parts by mass. Among them, the sample piece No. 1 having good phosphorescence brightness and weather resistance results. 3-No. It can be seen that it is more preferable that 6 is included in the range of 0.5 to 3 parts by mass.

また、表1の比較用の試料片No.1と試料片No.2を対比すると、酸化チタンを裏面層に含有する試料片No.2は、酸化チタンを裏面層に含有しない試料片No.1に比べて、2時間後のりん光輝度が14mcd/mも向上しており、このことから、酸化チタンを裏面層に含有させることは、りん光輝度の向上に極めて有効であることが判る。
また、試料片No.9と試料片No.5を対比すると、表面層に含有させる可塑剤として、DOP(共役二重結合を有する光線透過率の低いフタル酸系エステル)を用いた試料片No.9は、可塑剤として、DINCH(共役二重結合を有しない光線透過率の高いフタル酸系エステルの水添物)を用いた試料片No.5に比べて、りん光輝度も耐候性も低下している。これより、表面層に含有させる可塑剤は、共役二重結合を有しない光線透過率の高いものが好適であることが判る。
In addition, the sample piece No. 1 and sample piece no. 2 is compared, sample piece No. 2 containing titanium oxide in the back layer. Sample No. 2 which does not contain titanium oxide in the back layer. Compared with 1, the phosphorescence brightness after 2 hours is improved by 14 mcd / m 2. From this, it can be said that the inclusion of titanium oxide in the back layer is extremely effective in improving the phosphorescence brightness. I understand.
Sample piece No. 9 and sample piece no. 5 is compared with the sample piece No. 5 using DOP (phthalic acid ester having a conjugated double bond and low light transmittance) as a plasticizer to be contained in the surface layer. Sample No. 9 using DINCH (a hydrogenated phthalic acid ester having a high light transmittance without a conjugated double bond) as a plasticizer. Compared with 5, the phosphorescence brightness and the weather resistance are lowered. From this, it can be seen that a plasticizer to be contained in the surface layer is preferably a plasticizer having no conjugated double bond and high light transmittance.

[実施例]
下記[表2]に示す組成の表面層用組成物と裏面層用組成物を調製し、厚さ1.5mmの表面層用シートと厚さ1.5mmの裏面層用シートを成形すると共に、両シートを積層して蓄光性複層樹脂部材の試料片No.10、No.11、No.12、No.13を作製した。
これらの試料片について、前記と同様にして2時間後のりん光輝度と耐候性を測定すると共に、蓄光材の脱落の難易は、シートを直径30mmの円柱に巻付けて固定した後、円周に沿ってセロハンテープをシート表面に圧着しながら貼付け、そのテープを剥離して、セロハンテープに付着した蓄光材の多寡を目視で確認して調べた。その結果を下記[表2]に示す。なお、前述の試料片No.4のりん光輝度、耐候性、蓄光材の脱落の難易についても、下記[表2]に併記する。
[Example]
While preparing the composition for the surface layer and the composition for the back surface layer of the composition shown in [Table 2] below, forming the sheet for the surface layer having a thickness of 1.5 mm and the sheet for the back surface layer having a thickness of 1.5 mm, Both sheets were laminated to obtain a sample piece No. 10, no. 11, no. 12, no. 13 was produced.
About these sample pieces, the phosphorescence brightness and weather resistance after 2 hours were measured in the same manner as described above, and the difficulty of dropping off the phosphorescent material was determined by winding the sheet around a cylinder with a diameter of 30 mm and fixing the circumference. Then, the cellophane tape was applied to the sheet surface while being pressed, the tape was peeled off, and the amount of phosphorescent material adhering to the cellophane tape was visually confirmed and examined. The results are shown in [Table 2] below. The above-mentioned sample piece No. The phosphorescence brightness, weather resistance, and difficulty of dropping the phosphorescent material are also shown in [Table 2] below.

Figure 2016153200
Figure 2016153200

この表2を見ると、表面層に含有される蓄光材の平均粒子径が40〜350μmの範囲内にある試料片No.11、No.4、No.12は、2時間後のりん光輝度も耐候性も合格水準(70mcd/m、140hr)以上であり、蓄光材の脱落の難易についても「しない」もしくは「し難い」となっている。これに対し、蓄光材の平均粒子径が25μmと小さ過ぎる試料片No.10や、蓄光材の平均粒子径が500μmと大き過ぎる試料片No.13は、りん光輝度が低下して合格水準を下回るようになる。そして、蓄光材の平均粒子径が大きい試料片ほど、耐候性が低下し、蓄光材が脱落し易くなる傾向みられる。
以上より、蓄光材は、平均粒子径が40〜350μmのものが好ましく使用され、更に好ましい蓄光材の平均粒子径は50〜300μmであることが判る。
When this Table 2 is seen, sample piece No. in which the average particle diameter of the luminous material contained in a surface layer exists in the range of 40-350 micrometers. 11, no. 4, no. No. 12 has phosphorescence brightness after 2 hours and weather resistance are not less than acceptable levels (70 mcd / m 2 , 140 hr), and the difficulty of dropping off the phosphorescent material is “not” or “difficult”. On the other hand, sample piece No. 2 in which the average particle diameter of the phosphorescent material is too small, 25 μm. 10 and the sample piece No. 10 in which the average particle diameter of the phosphorescent material is too large as 500 μm. No. 13, phosphorescence brightness falls and falls below the acceptable level. And it seems that the sample piece with a larger average particle diameter of the phosphorescent material has a lower weather resistance, and the phosphorescent material tends to fall off.
From the above, it can be seen that the phosphorescent material preferably has an average particle diameter of 40 to 350 μm, and the more preferable average particle diameter of the phosphorescent material is 50 to 300 μm.

[実施例]
下記[表3]に示す組成の表面層用組成物と裏面層用組成物を調製し、厚さ1.5mmの表面層用シートと厚さ1.5mmの裏面層用シートを成形すると共に、両シートを積層して蓄光性複層樹脂部材の試料片No.14、No.15、No.16、No.17、No.18を作製した。
これらの試料片について、前記と同様にして2時間後のりん光輝度と耐候性を測定すると共に、曲げもろさは試料片を直径50mm、40mm、30mm、20mm、10mm、5mmの円柱に順に沿わせ、試料片に亀裂を生じない最大直径を評価値とした。その結果を下記[表3]に示す。なお、前述の試料片No.4のりん光輝度、耐候性、曲げもろさについても、下記[表3]に併記する。
[Example]
While preparing the composition for the surface layer and the composition for the back surface layer of the composition shown in [Table 3] below, forming a sheet for the surface layer having a thickness of 1.5 mm and a sheet for the back surface layer having a thickness of 1.5 mm, Both sheets were laminated to obtain a sample piece No. 14, no. 15, no. 16, no. 17, no. 18 was produced.
For these sample pieces, the phosphorescence brightness and weather resistance after 2 hours were measured in the same manner as described above, and the bending fragility was obtained by aligning the sample pieces in order to 50 mm, 40 mm, 30 mm, 20 mm, 10 mm, and 5 mm cylinders. The maximum diameter that does not cause cracks in the sample piece was taken as the evaluation value. The results are shown in [Table 3] below. The above-mentioned sample piece No. The phosphorescence brightness, weather resistance and bending brittleness of No. 4 are also shown in [Table 3] below.

Figure 2016153200
Figure 2016153200

この表3を見ると、蓄光材の含有量が表面層の塩化ビニル樹脂100質量部に対して50〜300質量部の範囲内にある試料片No.15、No.4、No.16、No.17、No.18は、蓄光材の含有量が多いものほど、りん光輝度も耐候性も向上し、合格水準を上回っているが、蓄光材の含有量が25質量部と少な過ぎる試料片No.14は、りん光輝度も耐候性も合格水準を大きく下回っている。また、曲げもろさは、蓄光材の含有量が多くなるほど低下し、含有量が300質量部の試料片No.14は、曲げもろさが合格水準をクリアできなくなる。
これより、合格水準以上のりん光輝度と耐候性を得るためには、蓄光材の含有量を50〜300質量部とし、併せて合格水準以上の曲げもろさも得る場合は、蓄光材の含有量を50〜250質量部とすればよく、100〜250質量部とすれば一層好ましいことが判る。
When this Table 3 is seen, sample piece No. in which content of a phosphorescent material exists in the range of 50-300 mass parts with respect to 100 mass parts of vinyl chloride resin of a surface layer. 15, no. 4, no. 16, no. 17, no. No. 18 has a higher phosphorescent brightness and weather resistance as the phosphorescent material content is higher, and exceeds the acceptable level, but the phosphorescent material content is too small at 25 parts by mass. No. 14 has phosphorescence brightness and weather resistance significantly lower than the acceptable levels. Further, the bending brittleness decreases as the phosphorescent material content increases, and the sample piece No. No. 14, the bending brittleness cannot pass the acceptable level.
From this, in order to obtain phosphorescence brightness and weather resistance above the acceptable level, the content of the phosphorescent material is 50 to 300 parts by mass, and when the bending brittleness above the acceptable level is also obtained, the content of the phosphorescent material 50 to 250 parts by mass, and 100 to 250 parts by mass is more preferable.

[実施例]
下記[表4]に示す組成の表面層用組成物と裏面層用組成物を調製し、厚さがそれぞれ0.5mm、2.0mmの表面層用シートと、厚さ1.5mmの裏面層用シートを成形すると共に、これらのシートを積層して、表面層の厚さが0.5mmで蓄光材の目付量が0.39kg/mの試料片No.19と、表面層の厚さが2.0mmで蓄光材の目付量が1.57kg/mの試料片、No.20を作製した。
これらの試料片について、前記と同様にして2時間後のりん光輝度と耐候性を測定し、その結果を下記[表4]に示した。なお、前述の試料片No.4(表面層の厚さ1.5mm、蓄光材の目付量0.78kg/m)のりん光輝度と耐候性の測定値も、下記[表4]に併記した。
[Example]
The composition for the surface layer and the composition for the back surface layer having the composition shown in [Table 4] below were prepared, the sheet for the surface layer having a thickness of 0.5 mm and 2.0 mm, respectively, and the back surface layer having a thickness of 1.5 mm. Sample sheets No. 1 having a surface layer thickness of 0.5 mm and a phosphorescent material basis weight of 0.39 kg / m 2 were formed. No. 19, a sample piece having a surface layer thickness of 2.0 mm and a phosphorescent material weight of 1.57 kg / m 2 , No. 19 20 was produced.
These sample pieces were measured for phosphorescence brightness and weather resistance after 2 hours in the same manner as described above, and the results are shown in [Table 4] below. The above-mentioned sample piece No. The measured values of phosphorescence luminance and weather resistance of No. 4 (surface layer thickness 1.5 mm, phosphorescent material weight per unit area 0.78 kg / m 2 ) are also shown in [Table 4] below.

Figure 2016153200
Figure 2016153200

この表4を見ると、表面層の厚さが増して、蓄光材の目付量が多くなるほど、りん光輝度も耐候性も向上するようになり、目付量が0.6〜1.8kg/mの範囲内にある試料片No.4、No.20は、りん光輝度も耐候性も合格水準以上である。これに対し、蓄光材の目付量が0.39kg/mと少な過ぎる試料片No.19は、りん光輝度も耐候性も合格水準を下回っている。
これより、表面層のマトリックス樹脂に対する蓄光材の含有量が一定である場合は、表面層の厚さを変えることにより、蓄光材の目付量が0.6〜1.8kg/mとなるように調節すればよいことが判る
As shown in Table 4, as the surface layer thickness increases and the basis weight of the phosphorescent material increases, the phosphorescence brightness and the weather resistance improve, and the basis weight is 0.6 to 1.8 kg / m. Sample piece No. 2 in the range of 2 . 4, no. No. 20 has phosphorescence brightness and weather resistance that are above acceptable levels. In contrast to this, the sample weight of the phosphorescent material is too small, 0.39 kg / m 2 . No. 19 has phosphorescence brightness and weather resistance both lower than acceptable levels.
From this, when the content of the phosphorescent material with respect to the matrix resin of the surface layer is constant, the basis weight of the phosphorescent material becomes 0.6 to 1.8 kg / m 2 by changing the thickness of the surface layer. You can adjust to

[実施例]
下記[表5]に示す組成の表面層用組成物と裏面層用組成物を調製し、厚さがそれぞれ2.0mm、1.0mmの表面層用シートと、厚さ1.5mmの裏面層用シートを成形すると共に、これらのシートを積層して、表面層の厚さが2.1mm、蓄光材の目付量が1.22kg/m、蓄光材の密度が0.58g/cmである試料片No.21と、表面層の厚さが1.1mm、蓄光材の目付量が1.22kg/m、蓄光材の密度が1.11g/cmである試料片No.22を作製した。
これらの試料片について、前記と同様にして2時間後のりん光輝度と耐候性を測定し、その結果を下記[表5]に示した。なお、前述の試料片No.4(表面層の厚さ1.5mm、蓄光材の目付量1.22kg/m、蓄光材の密度0.81g/cm)のりん光輝度と耐候性の測定値も、下記[表5]に併記した。
[Example]
The composition for the surface layer and the composition for the back layer having the composition shown in [Table 5] below were prepared, and the sheet for the surface layer having a thickness of 2.0 mm and 1.0 mm, respectively, and the back layer having a thickness of 1.5 mm The sheet is molded and laminated, and the surface layer has a thickness of 2.1 mm, the basis weight of the phosphorescent material is 1.22 kg / m 2 , and the density of the phosphorescent material is 0.58 g / cm 3 A certain sample piece No. 21, sample piece No. 1 having a surface layer thickness of 1.1 mm, a phosphorescent material weight of 1.22 kg / m 2 , and a phosphorescent material density of 1.11 g / cm 3 . 22 was produced.
These sample pieces were measured for phosphorescence brightness and weather resistance after 2 hours in the same manner as described above, and the results are shown in [Table 5] below. The above-mentioned sample piece No. 4 (surface layer thickness 1.5 mm, phosphorescent material basis weight 1.22 kg / m 2 , phosphorescent material density 0.81 g / cm 3 ), the measured values of phosphorescence luminance and weather resistance are also shown in [Table 5 ].

Figure 2016153200
Figure 2016153200

この表5を見ると、表面層の蓄光材の目付量が適量で一定している場合は、蓄光材の密度が小さくなるにつれて、りん光輝度が向上するが、耐候性は低下することが判る。蓄光材の密度が0.5〜1g/cmの範囲にある試料片No.21、No4は、りん光輝度も耐候性も合格水準以上であるが、蓄光材の密度が1.11g/cmと大きい試料片No.22は、耐候性が155hrと良好で合格水準を上回るが、りん光輝度は合格水準を下回るようになる。蓄光材の密度が大きくなると、りん光輝度が低下するのは、波長300〜700nmの光線は、蓄光材の密度が大きくなって蓄光材粒子の間隔が短くなるほど、透過しにくくなるからであるからと考えられる。これに対し、蓄光材の密度が大きくなるほど耐候性が向上するのは、表面層1を透過する紫外線量が少なくなるため、表面層と裏面層の紫外線による樹脂劣化が少なくなるからであると考えられる。 As can be seen from Table 5, when the basis weight of the phosphorescent material in the surface layer is constant and constant, the phosphorescence brightness increases as the density of the phosphorescent material decreases, but the weather resistance decreases. . Sample piece No. in which the density of the phosphorescent material is in the range of 0.5 to 1 g / cm 3 . No. 21 and No. 4 have phosphorescence luminance and weather resistance that are above acceptable levels, but the density of the phosphorescent material is as large as 1.11 g / cm 3 . No. 22 has a good weather resistance of 155 hr and exceeds the acceptable level, but the phosphorescence luminance is below the acceptable level. When the density of the phosphorescent material increases, the phosphorescence brightness decreases because light with a wavelength of 300 to 700 nm is less likely to be transmitted as the phosphorescent material density increases and the interval between phosphorescent material particles decreases. it is conceivable that. On the other hand, the weather resistance is improved as the density of the phosphorescent material is increased, because the amount of ultraviolet rays transmitted through the surface layer 1 is reduced, and therefore, the resin deterioration due to ultraviolet rays in the surface layer and the back layer is reduced. It is done.

[実施例]
下記[表6]に示す組成の表面層用組成物と裏面層用組成物を調製し、厚さが1.5mmの表面層用シートと、厚さ1.5mmの裏面層用シートを成形すると共に、これらのシートを積層して、裏面層の酸化チタンの含有量が異なる蓄光材複層樹脂部材の試料片No23、No.24、No.25、No.26、No.27を作製した。
これらの試料片について、前記と同様にして2時間後のりん光輝度と耐候性を測定すると共に、耐熱性を200℃のオーブン中に20分間放置し、それによる試料片の色相変化を目視で確認するという方法で測定し、その結果を下記[表6]に示した。なお、前述の試料片No.4のりん光輝度、耐候性、耐熱性の測定値も、下記[表6]に併記した。
[Example]
The composition for the surface layer and the composition for the back surface layer having the composition shown in [Table 6] below are prepared, and a sheet for the surface layer having a thickness of 1.5 mm and a sheet for the back surface layer having a thickness of 1.5 mm are formed. In addition, these sheets are laminated, and sample pieces No23, No.2 of the phosphorescent material multilayer resin members having different titanium oxide contents in the back surface layer. 24, no. 25, no. 26, no. 27 was produced.
For these sample pieces, the phosphorescence brightness and weather resistance after 2 hours were measured in the same manner as described above, and the heat resistance was allowed to stand in an oven at 200 ° C. for 20 minutes. It measured by the method of confirming, and the result was shown in the following [Table 6]. The above-mentioned sample piece No. The measured values of phosphorescence brightness, weather resistance and heat resistance of No. 4 are also shown in [Table 6] below.

Figure 2016153200
Figure 2016153200

この表6を見ると、裏面層の酸化チタンの含有量が多い試料片ほど、耐候性が向上し、耐熱性が低下することが判る。そして、りん光輝度は、酸化チタンの含有量が10〜15質量部に達するまで上昇し、それより多くなると低下する傾向がある。酸化チタンの含有量が5〜20質量部である試料片No.24、No.4、No.25、No.26は、りん光輝度も、耐候性も、耐熱性も合格水準以上となるが、酸化チタンの含有量が3質量部と少な過ぎる試料片No.23は、りん光輝度と耐候性が合格水準を下回り、酸化チタンの含有量が30質量部と多過ぎる試料片No.27は、りん光輝度と耐熱性が合格水準を下回るようになる。
これより、合格水準以上のりん光輝度と耐候性と耐熱性を得るために好ましい酸化チタンの含有量は、裏面層のマトリックス樹脂100質量部に対して5〜20質量部であることが判る。
From Table 6, it can be seen that a sample piece having a larger content of titanium oxide in the back surface layer has improved weather resistance and reduced heat resistance. And phosphorescence brightness | luminance rises until content of titanium oxide reaches 10-15 mass parts, and when it exceeds it, there exists a tendency for it to fall. Sample piece No. 5 in which the content of titanium oxide is 5 to 20 parts by mass. 24, no. 4, no. 25, no. No. 26 shows phosphorescence brightness, weather resistance, and heat resistance exceeding the acceptable level, but the content of titanium oxide is too small as 3 parts by mass. No. 23 is a sample piece No. 23 in which the phosphorescence luminance and weather resistance are lower than the acceptable level, and the content of titanium oxide is too large at 30 parts by mass. No. 27, phosphorescence brightness and heat resistance are below acceptable levels.
From this, it can be seen that the preferable titanium oxide content for obtaining phosphorescent brightness, weather resistance and heat resistance at or above the acceptable level is 5 to 20 parts by mass with respect to 100 parts by mass of the matrix resin of the back layer.

1 表面層
2 裏面層
A 蓄光性複層樹脂部材
DESCRIPTION OF SYMBOLS 1 Front surface layer 2 Back surface layer A Luminescent multilayer resin member

Claims (6)

蓄光材を含有する合成樹脂製の表面層と、合成樹脂製の裏面層とを備えた蓄光性複層樹脂部材であって、
表面層が透光性を有し、裏面層が蛍光増白剤を含有することを特徴とする蓄光性複層樹脂部材。
A phosphorescent multilayer resin member comprising a synthetic resin surface layer containing a phosphorescent material, and a synthetic resin back layer,
A phosphorescent multilayer resin member, wherein the surface layer has translucency and the back layer contains a fluorescent brightening agent.
前記裏面層は酸化チタンを含有し、略白色の層であることを特徴とする、請求項1に記載の蓄光性複層樹脂部材。   The phosphorescent multilayer resin member according to claim 1, wherein the back layer contains titanium oxide and is a substantially white layer. 前記裏面層における蛍光増白剤の含有量が、裏面層のマトリックス樹脂100質量部に対して0.1〜5質量部であることを特徴とする、請求項1又は請求項2に記載の蓄光性複層樹脂部材。   The phosphorescent according to claim 1 or 2, wherein the content of the fluorescent brightening agent in the back layer is 0.1 to 5 parts by mass with respect to 100 parts by mass of the matrix resin of the back layer. Multi-layer resin member. 前記裏面層における酸化チタンの含有量が、裏面層のマトリックス樹脂100質量部に対して5〜20質量部であることを特徴とする、請求項2又は請求項3に記載の蓄光性複層樹脂部材。   The phosphorescent multilayer resin according to claim 2 or 3, wherein the content of titanium oxide in the back layer is 5 to 20 parts by mass with respect to 100 parts by mass of the matrix resin in the back layer. Element. 前記蛍光増白剤の分子量が200〜700であることを特徴とする、請求項1ないし請求項4のいずれかに記載の蓄光性複層樹脂部材。   The luminous white multilayer resin member according to any one of claims 1 to 4, wherein the fluorescent brightening agent has a molecular weight of 200 to 700. 前記表面層の波長300〜400nmの光線透過率が30%以上であることを特徴とする、請求項1ないし請求項5のいずれかに記載の蓄光性複層樹脂部材。   The light-storing multilayer resin member according to any one of claims 1 to 5, wherein the surface layer has a light transmittance at a wavelength of 300 to 400 nm of 30% or more.
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JPH1082023A (en) * 1996-09-10 1998-03-31 Sekisui Chem Co Ltd Light-accumulating road marking material
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