WO2020255200A1 - Display protective film - Google Patents
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- WO2020255200A1 WO2020255200A1 PCT/JP2019/023885 JP2019023885W WO2020255200A1 WO 2020255200 A1 WO2020255200 A1 WO 2020255200A1 JP 2019023885 W JP2019023885 W JP 2019023885W WO 2020255200 A1 WO2020255200 A1 WO 2020255200A1
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- base material
- protective film
- material layer
- display protective
- display
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
Definitions
- the present invention relates to a display protective film.
- Patent Document 1 discloses a protective film in which a coat layer, a base material layer, and an adhesive layer are laminated. ..
- the surface of the base material layer is provided with a coat layer containing a fluorine-based compound, and the antifouling property is exhibited by the chemical physical properties of the coat layer, but the antifouling property is improved by another method. It is preferable from the viewpoint of cost reduction and productivity if the number of layers can be suppressed.
- an object of the present invention is to provide a display protective film capable of improving antifouling property by the fine shape of the surface.
- the display protective film of the present invention for achieving the above object has a base material layer and an adhesive layer in the stacking direction, and the surface of the base material layer opposite to the pressure-sensitive adhesive layer conforms to JIS B0601.
- the maximum cross-sectional height Rt measured is 5.0 ⁇ m or more.
- stains can be suppressed by the fine shape of the surface of the base material layer, and stain resistance can be improved.
- the display protective film 100 of the embodiment has a base material layer 110, an adhesive layer 120, and a release liner 130 in this order in the stacking direction.
- the display protective film 100 is used by peeling off the release liner 130.
- the display protective film 100 is attached to a display of, for example, a smartphone or a tablet computer via an adhesive layer 120 to protect the display.
- the display protective film 100 has transparency for transmitting light from the display in a state where the release liner 130 is peeled off.
- the base material layer 110 is preferably formed of polyurethane, but is not limited to this, and may be formed of, for example, polyvinyl chloride (PVC), polyethylene terephthalate (PET), or the like.
- PVC polyvinyl chloride
- PET polyethylene terephthalate
- the display protective film 100 has excellent followability to the display because of its high flexibility, and can be suitably attached to, for example, a display including a curved surface.
- the polyurethane include polyester polyurethane, polyether polyurethane, polycarbonate polyurethane and the like.
- the base material layer 110 may be, for example, a stabilizer, a lubricant, a filler, a processing aid, a softener, an antifogging agent, an ultraviolet absorber, an antioxidant, an antistatic agent, a hard-twisting agent, etc. May be included as appropriate.
- the thickness of the base material layer 110 is, for example, about 100 ⁇ m, but is not limited to this.
- the surface 111 of the base material layer 110 opposite to the adhesive layer 120 is a surface that a finger touches for the operation of the display protective film 100 when it is attached to a display such as a smartphone or a tablet computer. Due to the fine surface shape, stains such as sebum and sweat are suppressed.
- the surface 111 is formed to be appropriately rough so that the maximum cross-sectional height Rt measured in accordance with JIS B0601 (ISO 4287) is 5.0 ⁇ m or more.
- the upper limit of the maximum cross-sectional height Rt is not particularly limited, but is, for example, 25 ⁇ m.
- the dirt 10 easily adheres and spreads over a wide area in the form of a thin film.
- the surface 111 of the present embodiment includes a valley 112 having a maximum cross-sectional height Rt of 5.0 ⁇ m or more and a relatively large depth, and a mountain 113 having a relatively large height. As shown in FIG. 2, they block the spread of dirt in a thin film form, so that it is considered that the dirt is difficult to understand and is suppressed.
- the surface 111 is a surface on which the finger is slid for the operation when the display protective film 100 is attached to the display of a smartphone, a tablet computer, or the like, the surface 111 is suitable for actual use. It is preferable that the entire surface is formed to be moderately rough and the dynamic friction coefficient ⁇ D is suppressed so as to obtain the properties.
- the surface 111 preferably has an arithmetic mean roughness Ra measured in accordance with JIS B0601 of 0.5 ⁇ m or more, and has a coefficient of dynamic friction ⁇ D measured in accordance with JIS K7125 of 3. It is preferably 0.0 or less.
- the upper limit of the arithmetic mean roughness Ra is not particularly limited, but is, for example, 5.0 ⁇ m.
- the lower limit of the dynamic friction coefficient ⁇ D is not particularly limited, but is, for example, 0.1.
- How to form the surface 111 appropriately rough so as to obtain the surface characteristics as described above is not particularly limited, but for example, a base material layer is formed on a process film having a surface on which fine irregularities are formed.
- the surface 111 may be formed appropriately rough by a method of applying a solution of the composition constituting 110 and heating / drying, a method of extruding and cooling the melt, or the like.
- the pressure-sensitive adhesive layer 120 is not particularly limited in what kind of material is formed as long as it exhibits suitable adhesive strength to the display and does not interfere with the visibility of the display.
- the material for forming the pressure-sensitive adhesive layer 120 include acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, styrene-diene block copolymer pressure-sensitive adhesives, and vinyl alkyl ether-based materials. Examples thereof include a pressure-sensitive adhesive, a polyamide-based pressure-sensitive adhesive, and a fluorine-based pressure-sensitive adhesive, and these pressure-sensitive adhesives may be used alone or in combination of two or more.
- the thickness of the pressure-sensitive adhesive layer 120 is, for example, 10 ⁇ m or more and 100 ⁇ m or less, but is not limited thereto.
- the peeling liner 130 is arranged so as to be peelable on the pressure-sensitive adhesive layer 120.
- the material for forming the release liner 130 is not particularly limited, and is, for example, a polyester film such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate, or a plastic film such as a polyolefin film such as polypropylene or polyethylene; high-quality paper, glassin paper, or kraft paper. , Paper such as clay-coated paper, polyethylene-laminated paper obtained by polyethylene-laminating these papers, polypropylene-laminated paper obtained by polypropylene-laminating these papers, and the like.
- a release agent layer made of, for example, silicone may be formed on the surface of the release liner 130 in contact with the pressure-sensitive adhesive layer 120.
- the present inventors actually produced the display protective films of Examples 1 to 3 based on the above embodiments, and compared them with the display protective films of Comparative Examples different from those of the display protective films of Examples 1 to 3. The performance of was verified.
- the display protective films of Examples 1 to 3 and Comparative Examples have a structure in which a base material layer and an adhesive layer are laminated.
- the base material layer is all made of polyurethane of the same material, and in Example 3, the base material layer is made of polyvinyl chloride (PVC).
- the base material layers all have a thickness of 100 ⁇ m, but each of the base material layers has a surface opposite to the pressure-sensitive adhesive layer (hereinafter, simply the surface of the base material layer).
- the fine shape characteristics of (referred to as) are different.
- Other configurations are common to the examples and the comparative examples.
- the surface of the base material layer is formed so as to be appropriately rough and the maximum cross-sectional height Rt is 5.0 ⁇ m or more, whereas in the comparative example, the base material is formed.
- the surface of the layer is formed to be smoother than in Examples 1 to 3 and the maximum cross-sectional height Rt is smaller than 5.0 ⁇ m.
- the present inventors apply a solution of a composition forming a base material layer to a process film having a different surface fine shape, heat and dry it, and transfer the fine shape of the process film to the surface of the base material layer.
- the shape characteristics of the surface of the base material layer were changed.
- the present inventors After preparing the display protective films of Examples 1 to 3 and Comparative Examples, the present inventors measured the maximum cross-sectional height Rt on the surface of each base material layer. The present inventors also measured the arithmetic mean roughness Ra and the dynamic friction coefficient ⁇ D for the same surface.
- SURFTEST SV-3000 manufactured by Mitutoyo Co., Ltd. was used for the measurement of the maximum cross-sectional height Rt and the measurement of the arithmetic mean roughness Ra.
- the coefficient of kinetic friction ⁇ D was measured according to JIS K7125 (ISO 8295). Specifically, the present inventors placed a 6.3 cm ⁇ 6.3 cm mass 200 g plate formed of SUS (stainless steel) on the surface of each fixed base material layer, and placed the plate at a speed of 500 mm / min. The dynamic friction coefficient ⁇ D was calculated based on the surface force applied to the plate at this time.
- Table 1 summarizes the maximum cross-sectional height Rt, arithmetic mean roughness Ra, and dynamic friction coefficient ⁇ D measured for the surface of each base material layer of the display protective films of Examples 1 to 3 and Comparative Examples. ..
- the antifouling property was evaluated using the reagent used to identify the wettability index. Specifically, for example, as in JIS K6768 (ISO 8296), the reagent was applied to the surface of each base material layer, and how the reagent was wet and spread was observed. When the reagent spreads wet, the surface is judged to have low antifouling property, and when the reagent is repelled, the surface is judged to have high antifouling property.
- Reagent A is a mixed solution No. for wet tension test manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.
- Reagent B had the same NO.
- the reagent C was the same NO. 32 (surface tension 32 mN / m). Further, when they are arranged in descending order of surface tension, reagent A> reagent B> reagent C.
- Table 2 shows the verification results of antifouling properties.
- ⁇ indicates that the reagent is repelled and has high antifouling property
- ⁇ indicates that the reagent is wet and spreads and has low antifouling property.
- Examples 1 to 3 had higher antifouling properties than Comparative Examples. From this, if the surface of the base material layer has a maximum cross-sectional height Rt of 5.0 ⁇ m or more and contains valleys with a relatively large depth and peaks with a relatively large height, the dirt is thinned by them. It was confirmed that the antifouling property could be improved because it was thought that the spread would be blocked.
- the arithmetic mean roughness Ra on the surface of the base material layer is set to 0.5 ⁇ m or more as in Examples 1 to 3, the depth of the valley and the height of the mountain are large as a whole. It is considered that valleys and mountains are not easily crushed even if the finger is pressed against the surface when the finger is slid, and the contact surface with the finger can be effectively reduced so that good slipperiness suitable for actual use can be obtained.
- the coefficient of dynamic friction ⁇ D is set to 3.0 or less as in Examples 1 to 3, the feeling of resistance felt when the finger is slid is effectively suppressed, and it is suitable for actual use. It was confirmed that slipperiness can be exhibited.
- the display to which the display protective film of the present invention is attached is not limited to the displays such as smartphones and tablet computers mentioned in the above-described embodiment, and for example, displays such as laptop computers and smart watches.
- the shape and size of the display are not particularly limited.
- the display protective film of the present invention is not particularly limited as long as it is attached to the display, and may have, for example, a display shatterproof function.
- 100 display protective film 111
- the surface of the base material layer (the surface of the base material layer opposite to the adhesive layer), 112 Valleys contained in the fine shape of the surface of the substrate layer, 113 mountains contained in the fine shape of the surface of the base material layer, 120 adhesive layer, 130 Peeling liner.
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- Adhesive Tapes (AREA)
Abstract
[Problem] To provide a display protective film that can improve antifouling properties as a result of the surface thereof having a fine structure. [Solution] A display protective film 100 has, in the layering direction, a substrate layer 110 and an adhesive agent layer 120. A surface 111 of the substrate layer, which is on the side opposite the adhesive agent layer, has a maximum cross section height Rt of 5.0 µm or greater as determined in accordance with JIS B0601.
Description
本発明は、ディスプレイ保護フィルムに関する。
The present invention relates to a display protective film.
従来、スマートフォンやタブレット型コンピューター等のディスプレイに貼付して使用される保護フィルムがあり、例えば特許文献１では、コート層、基材層、および粘着剤層が積層された保護フィルムが開示されている。
Conventionally, there is a protective film that is used by being attached to a display of a smartphone, a tablet computer, or the like. For example, Patent Document 1 discloses a protective film in which a coat layer, a base material layer, and an adhesive layer are laminated. ..
上記特許文献１の発明は、基材層の表面に、フッ素系化合物を含有するコート層を備え、コート層の化学的物性によって、防汚性を発揮するが、他の手法によって防汚性向上を図ることができ、層数を抑えられるのであれば、コスト抑制および生産性の観点から好ましい。
In the invention of Patent Document 1, the surface of the base material layer is provided with a coat layer containing a fluorine-based compound, and the antifouling property is exhibited by the chemical physical properties of the coat layer, but the antifouling property is improved by another method. It is preferable from the viewpoint of cost reduction and productivity if the number of layers can be suppressed.
そこで、本発明は、表面の微細形状によって防汚性向上を図りうるディスプレイ保護フィルムを提供することを目的とする。
Therefore, an object of the present invention is to provide a display protective film capable of improving antifouling property by the fine shape of the surface.
上記目的を達成するための本発明のディスプレイ保護フィルムは、基材層および粘着剤層を積層方向に有し、前記基材層において前記粘着剤層と反対側の表面は、ＪＩＳ Ｂ０６０１に準拠して測定される最大断面高さＲｔが、５．０μｍ以上である。
The display protective film of the present invention for achieving the above object has a base material layer and an adhesive layer in the stacking direction, and the surface of the base material layer opposite to the pressure-sensitive adhesive layer conforms to JIS B0601. The maximum cross-sectional height Rt measured is 5.0 μm or more.
上記構成を有するディスプレイ保護フィルムによれば、基材層の表面の微細形状によって汚れが抑えられ、防汚性を向上できる。
According to the display protective film having the above configuration, stains can be suppressed by the fine shape of the surface of the base material layer, and stain resistance can be improved.
以下、添付した図面を参照しながら、本発明の実施形態を説明する。なお、図面の寸法比率は、説明の都合上誇張されており、実際の比率とは異なる。
Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. The dimensional ratios in the drawings are exaggerated for convenience of explanation and differ from the actual ratios.
図１に示すように、実施形態のディスプレイ保護フィルム１００は、基材層１１０、粘着剤層１２０、および剥離ライナー１３０を、積層方向にこの順序で有する。
As shown in FIG. 1, the display protective film 100 of the embodiment has a base material layer 110, an adhesive layer 120, and a release liner 130 in this order in the stacking direction.
ディスプレイ保護フィルム１００は、剥離ライナー１３０を剥がして使用される。ディスプレイ保護フィルム１００は、例えばスマートフォンやタブレット型コンピューター等のディスプレイに粘着剤層１２０を介して貼付され、ディスプレイを保護する。ディスプレイ保護フィルム１００は、剥離ライナー１３０の剥がされた状態で、ディスプレイからの光を透過する透明性を有する。
The display protective film 100 is used by peeling off the release liner 130. The display protective film 100 is attached to a display of, for example, a smartphone or a tablet computer via an adhesive layer 120 to protect the display. The display protective film 100 has transparency for transmitting light from the display in a state where the release liner 130 is peeled off.
基材層１１０は、好ましくはポリウレタンによって形成されるが、これに限定されず、例えば、ポリ塩化ビニル（ＰＶＣ）やポリエチレンテレフタレート（ＰＥＴ）等によって形成されてもよい。
The base material layer 110 is preferably formed of polyurethane, but is not limited to this, and may be formed of, for example, polyvinyl chloride (PVC), polyethylene terephthalate (PET), or the like.
基材層１１０がポリウレタンによって形成される形態では、柔軟性が高いため、ディスプレイ保護フィルム１００は、ディスプレイへの追従性に優れ、例えば曲面を含むディスプレイにも好適に貼付できる。ポリウレタンとしては、例えば、ポリエステル系ポリウレタン、ポリエーテル系ポリウレタン、ポリカーボネート系ポリウレタン等が挙げられる。
In the form in which the base material layer 110 is made of polyurethane, the display protective film 100 has excellent followability to the display because of its high flexibility, and can be suitably attached to, for example, a display including a curved surface. Examples of the polyurethane include polyester polyurethane, polyether polyurethane, polycarbonate polyurethane and the like.
また、基材層１１０は、必要に応じて、例えば、安定剤、滑剤、充填剤、加工助剤、軟化剤、防曇剤、紫外線吸収剤、酸化防止剤、帯電防止剤、難撚剤等を適宜含んでもよい。基材層１１０の厚みは、例えば１００μｍ程度であるが、これに限定されない。
Further, the base material layer 110 may be, for example, a stabilizer, a lubricant, a filler, a processing aid, a softener, an antifogging agent, an ultraviolet absorber, an antioxidant, an antistatic agent, a hard-twisting agent, etc. May be included as appropriate. The thickness of the base material layer 110 is, for example, about 100 μm, but is not limited to this.
基材層１１０において粘着剤層１２０と反対側の表面１１１は、ディスプレイ保護フィルム１００がスマートフォンやタブレット型コンピューター等のディスプレイに貼付された際、それらの操作のために指が触れる面であるが、微細な表面形状によって、例えば皮脂や汗等の汚れの抑制が図られている。
The surface 111 of the base material layer 110 opposite to the adhesive layer 120 is a surface that a finger touches for the operation of the display protective film 100 when it is attached to a display such as a smartphone or a tablet computer. Due to the fine surface shape, stains such as sebum and sweat are suppressed.
具体的に、表面１１１は、ＪＩＳ Ｂ０６０１（ＩＳＯ ４２８７）に準拠して測定される最大断面高さＲｔが、５．０μｍ以上となるように、適度に粗く形成されている。ここで、最大断面高さＲｔの上限値は、特に限定されないが、例えば２５μｍである。
Specifically, the surface 111 is formed to be appropriately rough so that the maximum cross-sectional height Rt measured in accordance with JIS B0601 (ISO 4287) is 5.0 μm or more. Here, the upper limit of the maximum cross-sectional height Rt is not particularly limited, but is, for example, 25 μm.
図２に示すように、本実施形態と異なり、平滑な基材層の表面１１１Ａでは、汚れ１０は、付着して薄膜状に広範囲に広がり易い。
As shown in FIG. 2, unlike the present embodiment, on the surface 111A of the smooth base material layer, the dirt 10 easily adheres and spreads over a wide area in the form of a thin film.
一方、図３に示すように、本実施形態の表面１１１では、最大断面高さＲｔが５．０μｍ以上で、深さの比較的大きい谷１１２や、高さの比較的大きい山１１３が含まれており、それらは汚れが図２で示したように薄膜状に広がるのを遮るため、汚れが分り難く抑制されると考えられる。
On the other hand, as shown in FIG. 3, the surface 111 of the present embodiment includes a valley 112 having a maximum cross-sectional height Rt of 5.0 μm or more and a relatively large depth, and a mountain 113 having a relatively large height. As shown in FIG. 2, they block the spread of dirt in a thin film form, so that it is considered that the dirt is difficult to understand and is suppressed.
また、表面１１１は、ディスプレイ保護フィルム１００がスマートフォンやタブレット型コンピューター等のディスプレイに貼付された際、それらの操作のために指が滑らされる面であることから、実使用に即した好適な滑り性が得られるよう、面の全体で適度に粗く形成され、また、動摩擦係数μＤが抑制されていることが好ましい。
Further, since the surface 111 is a surface on which the finger is slid for the operation when the display protective film 100 is attached to the display of a smartphone, a tablet computer, or the like, the surface 111 is suitable for actual use. It is preferable that the entire surface is formed to be moderately rough and the dynamic friction coefficient μ D is suppressed so as to obtain the properties.
具体的に、表面１１１は、ＪＩＳ Ｂ０６０１に準拠して測定される算術平均粗さＲａが、０．５μｍ以上であることが好ましく、ＪＩＳ Ｋ７１２５に準拠して測定される動摩擦係数μＤが、３．０以下であることが好ましい。ここで、算術平均粗さＲａの上限値は、特に限定されないが、例えば５．０μｍである。また、動摩擦係数μＤの下限値は、特に限定されないが、例えば０．１である。
Specifically, the surface 111 preferably has an arithmetic mean roughness Ra measured in accordance with JIS B0601 of 0.5 μm or more, and has a coefficient of dynamic friction μ D measured in accordance with JIS K7125 of 3. It is preferably 0.0 or less. Here, the upper limit of the arithmetic mean roughness Ra is not particularly limited, but is, for example, 5.0 μm. The lower limit of the dynamic friction coefficient μ D is not particularly limited, but is, for example, 0.1.
上述したような表面特性が得られるよう、どのようにして表面１１１を適度に粗く形成するかは、特に限定されないが、例えば、微細な凹凸が形成された面を有する工程フィルムに、基材層１１０を構成する組成物の溶液を塗布し加熱・乾燥する方法、又は溶融物を押出し冷却する方法等によって、表面１１１を適度に粗く形成してもよい。
How to form the surface 111 appropriately rough so as to obtain the surface characteristics as described above is not particularly limited, but for example, a base material layer is formed on a process film having a surface on which fine irregularities are formed. The surface 111 may be formed appropriately rough by a method of applying a solution of the composition constituting 110 and heating / drying, a method of extruding and cooling the melt, or the like.
粘着剤層１２０は、ディスプレイへの好適な粘着力を発揮し、またディスプレイの視認性の妨げとならなければ、どのような材料によって形成されるか特に限定されない。粘着剤層１２０の形成材料として、例えば、アクリル系粘着剤、ゴム系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤、ポリエステル系粘着剤、スチレン－ジエンブロック共重合体粘着剤、ビニルアルキルエーテル系粘着剤、ポリアミド系粘着剤、フッ素系粘着剤等が挙げられ、これらの粘着剤は、１種単独で用いても２種以上併用してもよい。粘着剤層１２０の厚みは、例えば１０μｍ以上１００μｍ以下であるが、これに限定されない。
The pressure-sensitive adhesive layer 120 is not particularly limited in what kind of material is formed as long as it exhibits suitable adhesive strength to the display and does not interfere with the visibility of the display. Examples of the material for forming the pressure-sensitive adhesive layer 120 include acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, styrene-diene block copolymer pressure-sensitive adhesives, and vinyl alkyl ether-based materials. Examples thereof include a pressure-sensitive adhesive, a polyamide-based pressure-sensitive adhesive, and a fluorine-based pressure-sensitive adhesive, and these pressure-sensitive adhesives may be used alone or in combination of two or more. The thickness of the pressure-sensitive adhesive layer 120 is, for example, 10 μm or more and 100 μm or less, but is not limited thereto.
剥離ライナー１３０は、粘着剤層１２０に剥離可能に配置されている。剥離ライナー１３０の形成材料は、特に限定されないが、例えば、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート等のポリエステルフィルム、ポリプロピレンやポリエチレン等のポリオレフィンフィルムなどのプラスチックフィルム；上質紙、グラシン紙、クラフト紙、クレーコート紙などの紙、これらの紙をポリエチレンラミネートしたポリエチレンラミネート紙、これらの紙をポリプロピレンラミネートしたポリプロピレンラミネート紙等が挙げられる。剥離ライナー１３０のうち、粘着剤層１２０と接する面には、例えばシリコーンからなる剥離剤層が形成されていてもよい。
The peeling liner 130 is arranged so as to be peelable on the pressure-sensitive adhesive layer 120. The material for forming the release liner 130 is not particularly limited, and is, for example, a polyester film such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate, or a plastic film such as a polyolefin film such as polypropylene or polyethylene; high-quality paper, glassin paper, or kraft paper. , Paper such as clay-coated paper, polyethylene-laminated paper obtained by polyethylene-laminating these papers, polypropylene-laminated paper obtained by polypropylene-laminating these papers, and the like. A release agent layer made of, for example, silicone may be formed on the surface of the release liner 130 in contact with the pressure-sensitive adhesive layer 120.
次に、実施例について述べる。
Next, an example will be described.
本発明者らは、上記実施形態に基づく実施例１～３のディスプレイ保護フィルムを実際に作製し、それらとは異なる比較例のディスプレイ保護フィルムと比較して、実施例１～３のディスプレイ保護フィルムの性能を検証した。
The present inventors actually produced the display protective films of Examples 1 to 3 based on the above embodiments, and compared them with the display protective films of Comparative Examples different from those of the display protective films of Examples 1 to 3. The performance of was verified.
実施例１～３および比較例のディスプレイ保護フィルムは、基材層および粘着剤層が積層された構成を有している。実施例１、２および比較例では、基材層は、全て同一材質のポリウレタンによって形成されており、実施例３では、基材層はポリ塩化ビニル（ＰＶＣ）によって形成されている。
The display protective films of Examples 1 to 3 and Comparative Examples have a structure in which a base material layer and an adhesive layer are laminated. In Examples 1 and 2 and Comparative Example, the base material layer is all made of polyurethane of the same material, and in Example 3, the base material layer is made of polyvinyl chloride (PVC).
実施例１～３および比較例において、それらの基材層は、全て１００μｍの厚みを有するが、それら基材層の各々では、粘着剤層と反対側の表面（以下、単に基材層の表面と称す）の微細な形状特性が異なっている。その他の構成については、実施例と比較例とで共通している。
In Examples 1 to 3 and Comparative Examples, the base material layers all have a thickness of 100 μm, but each of the base material layers has a surface opposite to the pressure-sensitive adhesive layer (hereinafter, simply the surface of the base material layer). The fine shape characteristics of (referred to as) are different. Other configurations are common to the examples and the comparative examples.
実施例１～３のディスプレイ保護フィルムでは、基材層の表面が、適度に粗く、最大断面高さＲｔが５．０μｍ以上となるように形成されているのに対し、比較例では、基材層の表面が、実施例１～３に比べて平滑で、最大断面高さＲｔが５．０μｍよりも小さくなるように形成されている。
In the display protective films of Examples 1 to 3, the surface of the base material layer is formed so as to be appropriately rough and the maximum cross-sectional height Rt is 5.0 μm or more, whereas in the comparative example, the base material is formed. The surface of the layer is formed to be smoother than in Examples 1 to 3 and the maximum cross-sectional height Rt is smaller than 5.0 μm.
本発明者らは、表面の微細形状が異なる工程フィルムに、基材層を形成する組成物の溶液を塗布して加熱・乾燥し、工程フィルムの微細形状を基材層の表面に転写することによって、実施例１～３および比較例の各々で、基材層の表面の形状特性を変えた。
The present inventors apply a solution of a composition forming a base material layer to a process film having a different surface fine shape, heat and dry it, and transfer the fine shape of the process film to the surface of the base material layer. In each of Examples 1 to 3 and Comparative Example, the shape characteristics of the surface of the base material layer were changed.
本発明者らは、実施例１～３および比較例のディスプレイ保護フィルムの作製後、それぞれの基材層の表面について、最大断面高さＲｔを測定した。また、本発明者らは、同表面について、算術平均粗さＲａ、および動摩擦係数μＤも測定した。
After preparing the display protective films of Examples 1 to 3 and Comparative Examples, the present inventors measured the maximum cross-sectional height Rt on the surface of each base material layer. The present inventors also measured the arithmetic mean roughness Ra and the dynamic friction coefficient μ D for the same surface.
最大断面高さＲｔの測定、および算術平均粗さＲａの測定には、株式会社ミツトヨ製ＳＵＲＦＴＥＳＴ ＳＶ－３０００を用いた。
SURFTEST SV-3000 manufactured by Mitutoyo Co., Ltd. was used for the measurement of the maximum cross-sectional height Rt and the measurement of the arithmetic mean roughness Ra.
動摩擦係数μＤは、ＪＩＳ Ｋ７１２５（ＩＳＯ ８２９５）に準拠して測定した。具体的に、本発明者らは、ＳＵＳ（ステンレス）によって形成された６．３ｃｍ×６．３ｃｍの質量２００ｇのプレートを、固定された各基材層の表面に載せ、これを速度５００ｍｍ／分で面方向に移動するよう牽引し、このときプレートに対して加わっている面方向の力に基づき、動摩擦係数μＤを算出した。
The coefficient of kinetic friction μ D was measured according to JIS K7125 (ISO 8295). Specifically, the present inventors placed a 6.3 cm × 6.3 cm mass 200 g plate formed of SUS (stainless steel) on the surface of each fixed base material layer, and placed the plate at a speed of 500 mm / min. The dynamic friction coefficient μ D was calculated based on the surface force applied to the plate at this time.
下の表１に、実施例１～３および比較例のディスプレイ保護フィルムの各基材層の表面について実測した、最大断面高さＲｔ、算術平均粗さＲａ、および動摩擦係数μＤをまとめて示す。
Table 1 below summarizes the maximum cross-sectional height Rt, arithmetic mean roughness Ra, and dynamic friction coefficient μ D measured for the surface of each base material layer of the display protective films of Examples 1 to 3 and Comparative Examples. ..
上に示した比較例および実施例１～３のディスプレイ保護フィルムの作製後、本発明者らは、それらの各々について防汚性を検証した。
After preparing the display protective films of Comparative Examples and Examples 1 to 3 shown above, the present inventors verified the antifouling property of each of them.
防汚性は、濡れ指数の特定に利用される試薬を用いて評価した。具体的には、例えばＪＩＳ Ｋ６７６８（ＩＳＯ ８２９６）と同様、試薬を各基材層の表面に塗布し、試薬がどのように濡れ広がるかを観察した。試薬が濡れ広がる場合、その表面は防汚性が低いと判断し、試薬をはじく場合、その表面は防汚性が高いと判断した。
The antifouling property was evaluated using the reagent used to identify the wettability index. Specifically, for example, as in JIS K6768 (ISO 8296), the reagent was applied to the surface of each base material layer, and how the reagent was wet and spread was observed. When the reagent spreads wet, the surface is judged to have low antifouling property, and when the reagent is repelled, the surface is judged to have high antifouling property.
本発明者らは、比較例および実施例１～３のディスプレイ保護フィルムのそれぞれに対し、３種類の試薬Ａ、Ｂ、Ｃを塗布した。試薬Ａは富士フィルム和光純薬株式会社製ぬれ張力試験用混合液ＮＯ．４８（表面張力４８ｍＮ／ｍ）で、試薬Ｂは同ＮＯ．４６（表面張力４６ｍＮ／ｍ）で、試薬Ｃは同ＮＯ．３２（表面張力３２ｍＮ／ｍ）である。また、それらを表面張力の大きい順に並べると、試薬Ａ＞試薬Ｂ＞試薬Ｃである。
The present inventors applied three types of reagents A, B, and C to each of the display protective films of Comparative Examples and Examples 1 to 3. Reagent A is a mixed solution No. for wet tension test manufactured by Fuji Film Wako Pure Chemical Industries, Ltd. At 48 (surface tension 48 mN / m), Reagent B had the same NO. At 46 (surface tension 46 mN / m), the reagent C was the same NO. 32 (surface tension 32 mN / m). Further, when they are arranged in descending order of surface tension, reagent A> reagent B> reagent C.
下の表２に、防汚性の検証結果を示す。表２において、○は試薬をはじいて防汚性が高いことを示し、×は試薬が濡れ広がって防汚性が低いことを示す。
Table 2 below shows the verification results of antifouling properties. In Table 2, ◯ indicates that the reagent is repelled and has high antifouling property, and × indicates that the reagent is wet and spreads and has low antifouling property.
表２に示す通り、実施例１～３の方が、比較例よりも防汚性が高いという結果が得られた。このことから、基材層の表面が、最大断面高さＲｔが５．０μｍ以上で、深さが比較的大きい谷や、高さが比較的大きい山を含んでいると、それらによって汚れが薄膜状に広がるのが遮られると考えられ、防汚性を高められることが確認できた。
As shown in Table 2, it was obtained that Examples 1 to 3 had higher antifouling properties than Comparative Examples. From this, if the surface of the base material layer has a maximum cross-sectional height Rt of 5.0 μm or more and contains valleys with a relatively large depth and peaks with a relatively large height, the dirt is thinned by them. It was confirmed that the antifouling property could be improved because it was thought that the spread would be blocked.
また、本発明者らは、比較例および実施例１～３のディスプレイ保護フィルムのそれぞれについて、基材層の表面に指を滑らせ、そのときの滑り性を検証した。その結果、比較例では指に抵抗感があったのに対し、実施例１～３では、実使用に即した良好な滑り性が得られた。
In addition, the present inventors have verified the slipperiness at that time by sliding a finger on the surface of the base material layer for each of the display protective films of Comparative Examples and Examples 1 to 3. As a result, in Comparative Examples, there was a feeling of resistance to the fingers, whereas in Examples 1 to 3, good slipperiness suitable for actual use was obtained.
このことから、実施例１～３のように、基材層の表面における算術平均粗さＲａが０．５μｍ以上であるようにすれば、谷の深さや山の高さが全体的に大きいため、指を滑らす際に表面に指を押し付けても谷や山が潰れ難いと考えられ、実使用に即した良好な滑り性が得られるよう指との接触面を効果的に低減できる。
From this, if the arithmetic mean roughness Ra on the surface of the base material layer is set to 0.5 μm or more as in Examples 1 to 3, the depth of the valley and the height of the mountain are large as a whole. It is considered that valleys and mountains are not easily crushed even if the finger is pressed against the surface when the finger is slid, and the contact surface with the finger can be effectively reduced so that good slipperiness suitable for actual use can be obtained.
また、実施例１～３のように、動摩擦係数μＤが３．０以下であるようにすれば、指を滑らせたときに感じられる抵抗感が効果的に抑制され、実使用に即した滑り性を発揮できることが確認できた。
Further, if the coefficient of dynamic friction μ D is set to 3.0 or less as in Examples 1 to 3, the feeling of resistance felt when the finger is slid is effectively suppressed, and it is suitable for actual use. It was confirmed that slipperiness can be exhibited.
本発明は、上述した実施形態に限定されるものではなく、特許請求の範囲内で種々改変できる。
The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.
例えば、本発明のディスプレイ保護フィルムの貼付対象であるディスプレイは、上述の実施形態で挙げたようなスマートフォンやタブレット型コンピューター等のディスプレイに限定されず、例えば、ラップトップ型コンピューターやスマートウォッチ等のディスプレイであってもよく、また、ディスプレイの形状や大きさも特に限定されない。
For example, the display to which the display protective film of the present invention is attached is not limited to the displays such as smartphones and tablet computers mentioned in the above-described embodiment, and for example, displays such as laptop computers and smart watches. The shape and size of the display are not particularly limited.
また、本発明のディスプレイ保護フィルムは、ディスプレイに貼付されるものであれば特に限定されず、例えばディスプレイの飛散防止機能等を備えていてもよい。
Further, the display protective film of the present invention is not particularly limited as long as it is attached to the display, and may have, for example, a display shatterproof function.
１００ ディスプレイ保護フィルム、
１１１ 基材層の表面（基材層における粘着剤層と反対側の表面）、
１１２ 基材層の表面の微細形状に含まれる谷、
１１３ 基材層の表面の微細形状に含まれる山、
１２０ 粘着剤層、
１３０ 剥離ライナー。 100 display protective film,
111 The surface of the base material layer (the surface of the base material layer opposite to the adhesive layer),
112 Valleys contained in the fine shape of the surface of the substrate layer,
113 Mountains contained in the fine shape of the surface of the base material layer,
120 adhesive layer,
130 Peeling liner.
１１１ 基材層の表面（基材層における粘着剤層と反対側の表面）、
１１２ 基材層の表面の微細形状に含まれる谷、
１１３ 基材層の表面の微細形状に含まれる山、
１２０ 粘着剤層、
１３０ 剥離ライナー。 100 display protective film,
111 The surface of the base material layer (the surface of the base material layer opposite to the adhesive layer),
112 Valleys contained in the fine shape of the surface of the substrate layer,
113 Mountains contained in the fine shape of the surface of the base material layer,
120 adhesive layer,
130 Peeling liner.
Claims (4)
- 基材層および粘着剤層を積層方向に有し、
前記基材層において前記粘着剤層と反対側の表面は、
ＪＩＳ Ｂ０６０１に準拠して測定される最大断面高さＲｔが、５．０μｍ以上である、ディスプレイ保護フィルム。 It has a base material layer and an adhesive layer in the stacking direction,
The surface of the base material layer opposite to the pressure-sensitive adhesive layer is
A display protective film having a maximum cross-sectional height Rt measured in accordance with JIS B0601 of 5.0 μm or more. - 前記基材層は、ポリウレタンによって形成されている、請求項１に記載のディスプレイ保護フィルム。 The display protective film according to claim 1, wherein the base material layer is made of polyurethane.
- 前記表面は、ＪＩＳ Ｂ０６０１に準拠して測定される算術平均粗さＲａが、０．５μｍ以上である、請求項１または請求項２に記載のディスプレイ保護フィルム。 The display protective film according to claim 1 or 2, wherein the surface surface has an arithmetic mean roughness Ra of 0.5 μm or more measured in accordance with JIS B0601.
- 前記表面は、ＪＩＳ Ｋ７１２５に準拠して測定される動摩擦係数μＤが、３．０以下である、請求項１～請求項３のうちのいずれか１つに記載のディスプレイ保護フィルム。 The display protective film according to any one of claims 1 to 3, wherein the surface has a coefficient of dynamic friction μ D measured in accordance with JIS K7125 of 3.0 or less.
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| JPH09239832A (en) * | 1996-03-11 | 1997-09-16 | Shin Etsu Polymer Co Ltd | Plastic sheet for remote control face |
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