JP6462941B1 - カバーフィルム - Google Patents
カバーフィルム Download PDFInfo
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- JP6462941B1 JP6462941B1 JP2018123213A JP2018123213A JP6462941B1 JP 6462941 B1 JP6462941 B1 JP 6462941B1 JP 2018123213 A JP2018123213 A JP 2018123213A JP 2018123213 A JP2018123213 A JP 2018123213A JP 6462941 B1 JP6462941 B1 JP 6462941B1
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- coat layer
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- acrylate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/03—Covers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
- C08J7/065—Low-molecular-weight organic substances, e.g. absorption of additives in the surface of the article
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- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/068—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using ionising radiations (gamma, X, electrons)
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
- B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
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- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/10—Removing layers, or parts of layers, mechanically or chemically
- B32B38/105—Removing layers, or parts of layers, mechanically or chemically on edges
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- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding
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- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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Abstract
【解決手段】本発明は、屈曲ディスプレイ用のカバーフィルムであって、透明の基材フィルムと、前記透明基材フィルムの少なくとも一方の面に形成されたハードコート層と、を備え、前記ハードコート層は、厚みが23以下μmであり、当該ハードコート層の端面の線粗さが、2.5μm以下である。
【選択図】なし
Description
透明の基材フィルムと、
前記透明基材フィルムの少なくとも一方の面に形成されたハードコート層と、
を備え、
前記ハードコート層は、
厚みが23μm以下であり、
当該ハードコート層の端面の線粗さRaが、2.5μm以下である、カバーフィルム。
前記ハードコート層上に保護フィルムを配置するステップと、
前記カバーフィルムをレーザーによって切断するステップと、
を備え、
当該ハードコート層の端面の線粗さRaが、2.5μm以下である、カバーフィルムの製造方法。
本発明に係る基材フィルムは、透明の種々の材料で形成することができ、例えば、セルロースアシレート、シクロオレフィンポリマー、ポリカーボネート、アクリレート系ポリマー、ポリエステル、ポリイミドなどで形成することができる。特に、ポリイミドは、屈曲に対して強く、また、屈曲しても癖が付きにくいため、好ましい。また、この基材フィルムには、必要に応じて種々の添加剤を添加することができる。例えば、可塑剤、帯電防止剤、紫外線吸収剤等の各種添加剤が添加されていてもよい。
マルテンス硬さ[N/mm2]=荷重[μN]/(24.5×(深さ最大値hmax(μm)2)
次に、ハードコート層について説明する。ハードコート層は、電離放射線硬化型樹脂、光重合開始剤などを含有するハードコート層形成用樹脂組成物を硬化させたものである。また、この組成物には、必要に応じて、後述する添加剤を配合することもできる。
電離放射線硬化型樹脂とは、電離放射線(紫外線または電子線)により高分子化または架橋反応するラジカル重合性を有する化合物を含み、例えば、構造単位中にエチレン性の不飽和結合を少なくとも1個以上含む化合物、またはこれらの混合物とすることができる。
重合開始剤としては、2,2−ジメトキシ−1,2−ジフェニルエタン−1−オン等のベンジルメチルケタール類、1−ヒドロキシシクロヘキシルフェニルケトン、2−ヒドロキシ−2−メチル−1−フェニルプロパン−1−オン等のα−ヒドロキシケトン類、2−メチル−1[4−(メチルチオ)フェニル]−2−モルフォリノプロパン−1−オン、2−ベンジル−2−ジメチルアミノ−1−(4−モルフォリノフェニル)ブタノン−1等のα−アミノケトン類、ビス(2,6−ジメトキシベンゾイル)−2,4,4−トリメチルペンチルフォスフィンオキサイド等のビスアシルフォスフィンオキサイド類、2,2'−ビス(o−クロロフェニル)−4,4',5,5'−テトラフェニル−1,1'−ビイミダゾール、ビス(2,4,5−トリフェニル)イミダゾール等のビスイミダゾール類、N−フェニルグリシン等のN−アリールグリシン類、4,4'−ジアジドカルコン等の有機アジド類、3,3',4,4'−テトラ(tert−ブチルペルオキシカルボキシル)ベンゾフェノン等の有機過酸化物類をはじめ、J.Photochem.Sci.Technol.,2,283(1987).に記載される化合物を挙げることができる。
ハードコート層形成用樹脂組成物には、必要に応じて添加剤を配合することができる。例えば、レベリング、表面スリップ性、低水接触角性等を付与するシリコーン系、フッ素系の添加剤(例えば、レベリング剤)を挙げることができる。このような添加剤を配合することにより、ハードコート層の表面の耐擦傷性を向上することができる。また、光重合の際に、紫外線を利用する場合は、上述した添加剤の空気界面へのブリードによって、酸素による樹脂の硬化阻害を低下させることができる。したがって、低照射強度条件下においても有効な硬化度合を得ることができる。これらの添加剤の配合量は、ハードコート層形成用樹脂組成物100重量部に対し、0.01〜0.5重量部とすることができる。
ハードコート層の厚みは、0.25μm以上23μm以下であり、鉛筆硬度が求められる場合のハードコート層の厚みの下限値は6μm以上が好ましく、8μm以上がさらに好ましい。また、上限値は20μm以下が好ましく、14μm以下であることがさらに好ましい。また、特に屈曲性が求められる場合のハードコート層の厚みの下限値は0.5μm以上が好ましく、0.75μm以上がさらに好ましい。また、上限値は1.5μm以下が好ましく、1.25μm以下がさらに好ましい。これは、0.25μm未満であると、十分な耐殺擦性能が得られず、また、23μmを超えると屈曲性の点で好ましくないからである。
本発明に係るカバーフィルムの製造方法は、特には限定されないが、例えば、上記基材フィルムに、ハードコート層形成用樹脂組成物を塗布し、これを乾燥させた後、光重合により硬化させることで、カバーフィルムを得ることができる。
上記のように製造されたカバーフィルムは、所望の大きさに切り出された後、使用される。カバーフィルムの切断は、レーザー、あるいは裁断機によって行うことができるが、本発明者は、切断によって生じたハードコート層の端面の線粗さが、大きいと、上述した屈曲性能(耐屈曲性)に影響を与えることを見いだした。
本実施形態に係るカバーフィルムによれば、ハードコート層の端面の線粗さRaを2.5μm以下とすることで、屈曲性能を向上することができる。したがって、屈曲ディスプレイ用のカバーフィルムとして好適に用いることができる。
以下では、実施例1〜6及び比較例1〜6に係るカバーフィルムの作製について説明する。
上記のように作製した実施例及び比較例から、速度等の条件を変えながらレーザーカット装置(GCC社製SpiritGX 30W)を用いて2.5×10cm、及び5×10cmのサンプル片を切り出した。このとき、ハードコート層の表面には、保護シートを貼り付け、その上でレーザーで切り出しを行った。保護シートは、厚みが5μmの粘着層が積層された、厚みが100μmのPETフィルムであり、粘着層をハードコート層に貼り付けた。
上記実施例1〜6及び比較例1〜6のハードコート層に対し、JIS−K5600−5−4に準拠する表面鉛筆硬度試験を行った。すなわち、ハードコート層の表面に750gの荷重をかけた硬度2Hから5Hの鉛筆(三菱UNI)を順に用い、試験を行った。そして、ハードコート層の表面のキズによる外観の変化を目視で評価した。結果は、いずれも4Hであった。
上記のように、耐屈曲性評価試験では、端面の線粗さが2.5μmより大きい比較例1〜6は、クラックが生じない円筒の最大径が、いずれも実施例1〜6よりも大きくなった。したがって、サンプル片の端面の線粗さが大きいと、屈曲性能が悪化することが分かった。この傾向は、サンプル片のサイズが変わっても同じであり、端面の線粗さが2.5μmより大きくなると、屈曲性能が悪化している。但し、サンプル片のサイズが大きくなると、実施例及び比較例ともに屈曲性能はやや低くなることが分かった。また、端面の線粗さが小さいと、端部に発生するバリも小さくなることが分かった。以上より、実施例に係るカバーフィルムは、曲率半径の小さい曲面を有する屈曲ディスプレイにおいても好適に用いることができることが分かった。
Claims (5)
- 屈曲ディスプレイ用のカバーフィルムであって、
透明の基材フィルムと、
前記透明基材フィルムの少なくとも一方の面に形成されたハードコート層と、
を備え、
前記ハードコート層は、
厚みが23μm以下であり、
当該ハードコート層の端面の線粗さRaが、2.5μm以下である、カバーフィルム。 - 端面がレーザーにより切断されている、請求項1に記載のカバーフィルム。
- 表面鉛筆硬度が、3H以上である、請求項1または2に記載のカバーフィルム。
- 透明の基材フィルムに、23μm以下の厚みのハードコート層を積層することで、カバーフィルムを形成するステップと、
前記ハードコート層上に保護フィルムを配置するステップと、
前記カバーフィルムをレーザーによって切断するステップと、
を備え、
当該ハードコート層の端面の線粗さRaが、2.5μm以下である、
カバーフィルムの製造方法。 - 前記レーザーによる切断の速度が、50〜600mm/secである、請求項4に記載のカバーフィルムの製造方法。
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