JP4632403B2 - Antireflection film - Google Patents

Antireflection film Download PDF

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JP4632403B2
JP4632403B2 JP2004092753A JP2004092753A JP4632403B2 JP 4632403 B2 JP4632403 B2 JP 4632403B2 JP 2004092753 A JP2004092753 A JP 2004092753A JP 2004092753 A JP2004092753 A JP 2004092753A JP 4632403 B2 JP4632403 B2 JP 4632403B2
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refractive index
fine particles
silica fine
low refractive
index layer
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JP2005283611A (en
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緑 中條
典永 中村
博臣 片桐
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Dai Nippon Printing Co Ltd
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本発明は、反射防止性と透明性を両立した機能性フィルム及びその製造方法に関する。さらに詳しくは、本発明は、例えば、コンピューター、テレビ等の各種ディスプレイ、表示素子に用いる偏光板の表面、サングラスレンズ、度付メガネレンズ、カメラ用ファインダーレンズ等の光学レンズ、各種計器のカバー、自動車、電車等の窓ガラス等に貼付して必要な機能、例えば、反射防止機能を付与するための光学機能性フィルム及びその製造方法に関する。   The present invention relates to a functional film having both antireflection properties and transparency and a method for producing the same. More specifically, the present invention includes, for example, various displays such as computers and televisions, surfaces of polarizing plates used for display elements, sunglasses lenses, prescription eyeglass lenses, optical lenses such as camera finder lenses, covers for various instruments, automobiles, and the like. The present invention relates to an optical functional film for imparting a necessary function, for example, an antireflection function, to a window glass of a train or the like, and a manufacturing method thereof.

従来より、基材上に直接又は他の層、例えば、高屈折率層及び/又は中屈折率層等を介して、低屈折率層を形成することにより、反射防止効果等の光学機能を向上させることはよく知られている。低屈折率層を形成する方法として、塗膜の表面付近に微細空孔を形成させることで、塗膜の屈折率を空気の屈折率に近づけるようにして塗膜の屈折率を低減させ、結果的に塗膜の表面をより低屈折率とすることが提案されている。   Conventionally, optical functions such as anti-reflection effect are improved by forming a low refractive index layer directly on the substrate or via another layer, such as a high refractive index layer and / or a medium refractive index layer. It is well known. As a method of forming a low refractive index layer, by forming fine pores near the surface of the coating film, the refractive index of the coating film is reduced by bringing the refractive index of the coating film closer to the refractive index of air, and as a result In particular, it has been proposed to make the surface of the coating film have a lower refractive index.

例えば、有機ケイ素化合物とバインダー樹脂を含む低屈折率樹脂組成物を塗布して表面がナノポーラス構造の低屈折率層を形成することにより、低屈折率を実現した反射防止積層体とすることが特開2002−79600(特許文献1)により知られている。しかしながら、特許文献1の反射防止積層体における低屈折率層表面の算術平均粗さRaは2nm−10nmであるため、ナノポーラス構造における微細な凹凸が反射防止積層体の透明性に悪影響を与えている。   For example, a low refractive index resin composition containing an organosilicon compound and a binder resin is applied to form a low refractive index layer having a nanoporous structure on the surface, thereby producing an antireflection laminate that achieves a low refractive index. This is known from Japanese Patent Application Laid-Open No. 2002-79600. However, since the arithmetic average roughness Ra of the surface of the low refractive index layer in the antireflection laminate of Patent Document 1 is 2 to 10 nm, fine irregularities in the nanoporous structure adversely affect the transparency of the antireflection laminate. .

アクリル系プレポリマー及び/又はアクリル系モノマーに中空シリカ粒子を用いることにより、シリカ粒子よりも屈折率を低減させて、反射防止性を向上させた低屈折率層を形成した反射防止フィルムが特開2003−292831号公報(特許文献2)により知られている。しかしながら、特許文献2の反射防止積層体における低屈折率層には中空シリカ粒子が含有されているため、表面の算術平均粗さRaはどうしても2nmを超えるものととなり、微細な凹凸が反射防止積層体の透明性に悪影響を与えている。   An antireflection film having a low refractive index layer in which an antireflective property is improved by using hollow silica particles in an acrylic prepolymer and / or an acrylic monomer to reduce the refractive index compared to silica particles is disclosed in JP No. 2003-292831 (Patent Document 2). However, since the low refractive index layer in the antireflection laminate of Patent Document 2 contains hollow silica particles, the arithmetic average roughness Ra of the surface inevitably exceeds 2 nm, and fine irregularities are present in the antireflection laminate. It has an adverse effect on the transparency of the body.

特開2002−79600号公報JP 2002-79600 A 特開2003−292831号公報JP 2003-292831 A

近年、各種ディスプレイ、光学物品等の表面に添付して使用される反射防止フィルムにおいて、視認性の向上が求められ、より透明性の高い反射防止フィルムが要求されている。そこで本発明は、各種ディスプレイ、光学物品等に添付して使用される反射防止フィルムにおいて、最上層が低屈折率で且つ透明性に優れた低屈折率層を有する反射防止フィルムを提供することを目的とする。   In recent years, in an antireflection film used by attaching to the surface of various displays, optical articles, etc., improvement in visibility has been demanded, and an antireflection film having higher transparency has been demanded. Therefore, the present invention provides an antireflection film having a low refractive index layer having a low refractive index and excellent transparency in an antireflective film attached to various displays and optical articles. Objective.

前記した課題を解決するための本発明の反射防止フィルムは、光透過性の基材フィルムの少なくとも一面側に、直接或いは他の層を介して、粒子径5nm〜300nmの中空シリカ微粒子或いは多孔質シリカ微粒子と、電離放射線硬化型樹脂と、水系有機溶剤が50%以上80%以下の比率の有機溶剤と、レベリング剤としてポリエーテル変性シリコーンオイルを含有する樹脂組成物を用いて低屈折率層が形成されたコンピュータ及び/又はディスプレイ用の反射防止フィルムであることを特徴とする。 The antireflection film of the present invention for solving the above-mentioned problems is a hollow silica fine particle or porous material having a particle diameter of 5 nm to 300 nm, directly or via another layer, on at least one surface side of a light-transmitting substrate film. A low refractive index layer is formed by using a resin composition containing silica fine particles, an ionizing radiation curable resin, an organic solvent having a water-based organic solvent ratio of 50% to 80%, and a polyether-modified silicone oil as a leveling agent. It is a formed antireflection film for computer and / or display.

本発明の反射防止フィルムの低屈折率層に含まれる、空隙を有する中空シリカ微粒子或いは多孔質シリカ微粒子は、微細な空隙を開口した状態、或いは閉口した状態で有しており、気体、例えば、屈折率1の空気が充填されているので、該微粒子はそれ自身の屈折率が低い特徴がある。該微粒子を塗膜中に集合体を形成せずに均一に分散した場合には、塗膜の屈折率を低下させる効果が高く、同時に透明性に優れる。空隙を有しない、通常のコロイダルシリカ粒子(屈折率n=1.46程度)に比べると、空隙を有する中空シリカ微粒子或いは多孔質シリカ微粒子の屈折率は1.20〜1.45と低い。   The hollow silica fine particles or porous silica fine particles having voids contained in the low refractive index layer of the antireflection film of the present invention have fine voids in an open state or a closed state, and a gas, for example, Since the air having a refractive index of 1 is filled, the fine particles are characterized by a low refractive index. When the fine particles are uniformly dispersed without forming an aggregate in the coating film, the effect of lowering the refractive index of the coating film is high, and at the same time, the transparency is excellent. Compared to ordinary colloidal silica particles having no voids (refractive index n = 1.46 or so), the hollow silica fine particles or porous silica fine particles having voids have a low refractive index of 1.20 to 1.45.

空隙を有する中空シリカ微粒子或いは多孔質シリカ微粒子は、平均粒子径5nm〜300nm、好ましくは5nm〜200nmの微粒子であり、空隙の平均孔径が0.01nm〜100nmであり、空気を含有する独立した、及び/又は連続した孔を有する多孔質シリカ微粒子や中空シリカ微粒子である。微粒子全体としての屈折率が1.20〜1.45である。本発明に使用する中空シリカ微粒子或いは多孔質シリカ微粒子をバインダー樹脂に添加して塗布組成物を構成することにより、1.45以上の屈折率であったバインダー樹脂に対して、塗布組成物全体として屈折率を低下させることができる。また、本発明において用いる空隙を有するシリカ微粒子は、平均粒子径が5nm〜300nm、好ましくは5nm〜200nmであり、塗膜中に分散されているため、塗膜の透明性が優れる。   The hollow silica fine particles or porous silica fine particles having voids are fine particles having an average particle diameter of 5 nm to 300 nm, preferably 5 nm to 200 nm, the voids have an average pore diameter of 0.01 nm to 100 nm, and contain air. And / or porous silica fine particles and hollow silica fine particles having continuous pores. The refractive index of the fine particles as a whole is 1.20 to 1.45. By forming the coating composition by adding the hollow silica fine particles or porous silica fine particles used in the present invention to the binder resin, the coating composition as a whole with respect to the binder resin having a refractive index of 1.45 or more. The refractive index can be lowered. The silica fine particles having voids used in the present invention have an average particle diameter of 5 nm to 300 nm, preferably 5 nm to 200 nm, and are excellent in transparency of the coating film because they are dispersed in the coating film.

本発明の反射防止フィルムにおける低屈折率層を形成するための塗布組成物に含まれる有機溶剤は、水系有機溶剤が50%以上の比率の有機溶剤が使用されているので、該塗布組成物を用いて形成された低屈折率層は透明性において優れるものとなり、得られた反射防止フィルムは反射防止性に優れると同時に透明性に優れる。   Since the organic solvent contained in the coating composition for forming the low refractive index layer in the antireflective film of the present invention is an organic solvent having a water-based organic solvent ratio of 50% or more, the coating composition is The low-refractive-index layer formed by using becomes excellent in transparency, and the obtained antireflection film is excellent in antireflection properties and at the same time excellent in transparency.

本発明において水系有機溶剤が50%以上の比率の有機溶剤が含有されている塗布組成物が使用されると、低屈折率層の透明性が優れる理由は、恐らく、該有機溶剤が多孔質シリカ微粒子や中空シリカ微粒子の表面に存在するOH基との親和性がよく、該有機溶剤が多孔質シリカ微粒子や中空シリカ微粒子の分散性を向上させ、その結果、塗膜の表面に多孔質シリカ微粒子や中空シリカ微粒子の凹凸が形成されにくくなるためと考えられる。また、水系有機溶剤のうち、ブタノールを用いた場合には、他の水系有機溶剤であるエタノール、メタノール、イソプロパノールに比べて塗膜の乾燥時間が長くなるため、塗膜の形成がゆっくりと行われ、レベリング効果により多孔質シリカ微粒子や中空シリカ微粒子は塗膜中でより均一に分散されるため、塗膜表面が滑らかになるものと考えられる。   In the present invention, when a coating composition containing 50% or more of an aqueous organic solvent is used, the reason why the transparency of the low refractive index layer is excellent is probably that the organic solvent is porous silica. Good affinity with OH groups present on the surface of fine particles and hollow silica fine particles, and the organic solvent improves the dispersibility of the porous silica fine particles and hollow silica fine particles. As a result, the porous silica fine particles are formed on the surface of the coating film. It is thought that the unevenness of the hollow silica fine particles is difficult to be formed. Of the aqueous organic solvents, butanol is used because the drying time of the coating film is longer than that of other aqueous organic solvents such as ethanol, methanol, and isopropanol. The porous silica fine particles and hollow silica fine particles are more uniformly dispersed in the coating film due to the leveling effect, so that the coating film surface is considered to be smooth.

さらに説明すれば、多孔質シリカ微粒子や中空シリカ微粒子が塗膜中に含まれることにより、通常、微粒子相互の凝集が起こり、塗膜の最表面に可視光の波長以下程度の細かな凹凸であって、塗膜表面の算術平均粗さRaが2nmを超える凹凸が形成される。このため、塗膜表面の算術平均粗さRaが2nmを超えると、塗膜表面において光が散乱され、低屈折率自体の透明性に悪影響を与える。これに対して、本発明の反射防止フィルムにおいては、中空シリカ微粒子あるいは多孔質シリカ微粒子は塗布組成物中に十分に分散され、これらの微粒子を含む塗膜はレベリングされた状態で硬化しているため、塗膜表面の算術平均粗さRaが1nm以上2nm未満、Rzが9.1nm以上10.9nm未満となり、結果的に、透明性が優れたものとなると考えられる。 To explain further, the inclusion of porous silica particles or hollow silica particles in the coating usually causes aggregation between the particles, and the outermost surface of the coating has fine irregularities of about the wavelength of visible light or less. Thus, irregularities having an arithmetic average roughness Ra of the coating film surface exceeding 2 nm are formed. For this reason, when the arithmetic average roughness Ra of the coating film surface exceeds 2 nm, light is scattered on the coating film surface, which adversely affects the transparency of the low refractive index layer itself. On the other hand, in the antireflection film of the present invention, the hollow silica fine particles or the porous silica fine particles are sufficiently dispersed in the coating composition, and the coating film containing these fine particles is cured in a leveled state. Therefore, the arithmetic average roughness Ra of the coating film surface is 1 nm or more and less than 2 nm, and Rz is 9.1 nm or more and less than 10.9 nm. As a result, it is considered that the transparency is excellent.

有機溶剤
低屈折率層を形成するための塗布組成物中の有機溶剤において水系有機溶剤が50%以上である理由は、50%未満であると、親水性が弱くなるため塗布組成物中において中空シリカ微粒子や多孔質シリカ微粒子の分散性が悪くなり、あるいは、乾燥時の乾燥時間を長くすることが困難なため、レベリング不足となり、得られた低屈折率層の表面には、塗膜表面の算術平均粗さRaが2nmを超えるような凹凸が形成されるからである。水系有機溶剤のうち、エタノール、メタノール、イソプロパノールに比べてノルマルブタノールは塗膜の乾燥時間が長いため、塗膜の形成がゆっくりと行われ、中空シリカ微粒子や多孔質シリカ微粒子は塗膜中でより均一に分散されるため、塗膜表面を滑らかにするのに有利である。低屈折率層を形成するために用いられる水系有機溶剤には、メタノール、エタノール、イソプロパノール、ノルマルブタノールが使用でき、特に好ましくは、上記理由からノルマルブタノールが好適である。
The reason why the aqueous organic solvent is 50% or more in the organic solvent in the coating composition for forming the organic solvent low refractive index layer is that the hydrophilicity becomes weak when it is less than 50%. Dispersibility of silica fine particles and porous silica fine particles deteriorates, or it is difficult to lengthen the drying time during drying, resulting in insufficient leveling. This is because irregularities having an arithmetic average roughness Ra exceeding 2 nm are formed. Among aqueous organic solvents, normal butanol has a longer drying time compared to ethanol, methanol, and isopropanol, so the coating film is formed slowly. Hollow silica fine particles and porous silica fine particles are more Since it is uniformly dispersed, it is advantageous for smoothing the coating surface. As the aqueous organic solvent used for forming the low refractive index layer, methanol, ethanol, isopropanol, and normal butanol can be used, and normal butanol is particularly preferable for the above reasons.

有機溶剤のうち水系有機溶剤以外の有機溶剤であって、有機溶剤のうち50%未満含有してもよい有機溶剤には、アセトン、メチルエチルケトン、メチルイソブチル等のケトン類、酢酸メチル、酢酸エチル、酢酸ブチル等のエステル類、ジイソプロピルエーテル等のエーテル類、エチレングリコール、プロピレングリコール、ヘキシレングリコール等のグリコール類、エチルセロソルブ、ブチルセロソルブ、エチルカルビトール、ブチルカルビトール等のグリコールエーテル類、ヘキサン、ヘプタン、オクタン等の脂肪族炭化水素類、ハロゲン化炭化水素、ベンゼン、トルエン、キシレン等の芳香族炭化水素、N−メチルピロリドン、ジメチルホルムアミド等が挙げられる。   Among organic solvents, organic solvents other than water-based organic solvents that may be contained in less than 50% of organic solvents include ketones such as acetone, methyl ethyl ketone, and methyl isobutyl, methyl acetate, ethyl acetate, acetic acid Esters such as butyl, ethers such as diisopropyl ether, glycols such as ethylene glycol, propylene glycol and hexylene glycol, glycol ethers such as ethyl cellosolve, butyl cellosolve, ethyl carbitol, butyl carbitol, hexane, heptane, octane Aliphatic hydrocarbons such as halogenated hydrocarbons, aromatic hydrocarbons such as benzene, toluene and xylene, N-methylpyrrolidone, dimethylformamide and the like.

バインダー樹脂
低屈折率層を形成するためのバインダー樹脂には、電離放射線硬化型樹脂が使用できる。電離放射線硬化型樹脂は塗布組成物中において重合していないモノマー又はオリゴマーの状態で存在するので、成膜性、塗布性に優れ、基材フィルム或いは隣接する他の層に対して密着性に優れる。
As the binder resin for forming the binder resin low refractive index layer, an ionizing radiation curable resin can be used. Since the ionizing radiation curable resin is present in a monomer or oligomer state that is not polymerized in the coating composition, it has excellent film forming properties and coating properties, and excellent adhesion to the base film or other adjacent layers. .

中空シリカ微粒子或いは多孔質シリカ微粒子
低屈折率層を形成するための塗布組成物中に含有される中空シリカ微粒子或いは多孔質シリカ微粒子は、空隙を有する微粒子であって、微粒子の内部に気体が充填された構造及び/又は気体を含む多孔質構造をとるシリカ微粒子である。空気雰囲気下において、空気の屈折率が1.0であるので、シリカ微粒子本来の屈折率に比べて中空シリカ微粒子或いは多孔質シリカ微粒子は、微粒子中の空気の占有率に反比例して屈折率が低下する。例えば、比表面積を大きくすることを目的として製造され、充填用のカラムや表面の多孔質部に各種化学物質を吸着させる除放材、触媒固定用に使用される多孔質微粒子や、断熱材や低誘電材に組み込むことを目的とする中空微粒子のうち、本発明に使用できる平均粒子径の範囲のものが好ましく使用できる。
Hollow silica fine particles or porous silica fine particles Hollow silica fine particles or porous silica fine particles contained in a coating composition for forming a low refractive index layer are fine particles having voids and filled with gas inside the fine particles. Silica fine particles having a structured structure and / or a porous structure containing a gas. Since the refractive index of air is 1.0 in an air atmosphere, the hollow silica fine particles or the porous silica fine particles have a refractive index inversely proportional to the occupation ratio of air in the fine particles compared to the original refractive index of the silica fine particles. descend. For example, it is manufactured for the purpose of increasing the specific surface area, and is used as a column for packing, a controlled release material that adsorbs various chemical substances to the porous portion of the surface, porous fine particles used for catalyst fixation, a heat insulating material, Of the hollow fine particles intended to be incorporated into a low dielectric material, those having an average particle diameter in the range of the present invention can be preferably used.

多孔質シリカ微粒子としては、例えば、市販品として日本シリカ工業株式会社製の商品名NipsilやNipgelの中から本発明を好ましく使用できる粒子径の範囲内のものを、また、中空シリカ微粒子としては、特開2001−233611号公報で開示されている技術を用いて調製した中空シリカ微粒子が好ましく用いられる。   As the porous silica fine particles, for example, those in the range of particle diameters in which the present invention can be preferably used from the product names Nippon and Nippon manufactured by Nippon Silica Kogyo Co., Ltd., and the hollow silica fine particles, Hollow silica fine particles prepared by using the technique disclosed in JP-A-2001-233611 are preferably used.

多孔質シリカ微粒子又は中空シリカ微粒子の平均粒子径、平均孔径及び屈折率は上記した通りである。   The average particle diameter, average pore diameter, and refractive index of the porous silica fine particles or hollow silica fine particles are as described above.

レベリング剤
低屈折率層を形成するための塗布組成物中に上記の成分に加えて、さらにレベリング剤を添加することにより、低屈折率層形成用の塗布組成物中の中空シリカ微粒子或いは多孔質シリカ微粒子の分散が促進され、得られた低屈折率層の表面はより滑らかなものとなり、算術平均粗さRaが1nm以上2nm未満の表面を容易に形成する上で有利となる。
In addition to the above components in the coating composition for forming the leveling agent low refractive index layer, by further adding a leveling agent, the hollow silica fine particles or porous material in the coating composition for forming the low refractive index layer The dispersion of the silica fine particles is promoted, and the surface of the obtained low refractive index layer becomes smoother, which is advantageous for easily forming a surface having an arithmetic average roughness Ra of 1 nm or more and less than 2 nm.

レベリング剤には、公知の一般的なレベリング剤が使用できる。例えば、シリコーンオイルが用いられる。好ましくは、ポリエーテル変性シリコーンオイル(TSF4460:商品名、GE東芝シリコーン株式会社製)が、水系有機溶剤及び一般の有機溶剤に可溶であるため、好適に用いられる。   A known general leveling agent can be used as the leveling agent. For example, silicone oil is used. Preferably, polyether-modified silicone oil (TSF4460: trade name, manufactured by GE Toshiba Silicone Co., Ltd.) is preferably used because it is soluble in aqueous organic solvents and general organic solvents.

他の成分
本発明に使用する低屈折率組成物は、必須成分として、上記の有機溶剤、バインダー樹脂、中空シリカ微粒子又は多孔質シリカ微粒子、レベリング剤を含有するが、さらに必要に応じて、重合開始剤、硬化剤、架橋剤、紫外線遮断剤、紫外線吸収剤、或いは、その他の成分を配合しても良い。
Other components The low refractive index composition used in the present invention contains the above organic solvent, binder resin, hollow silica fine particles or porous silica fine particles, and a leveling agent as essential components. You may mix | blend an initiator, a hardening | curing agent, a crosslinking agent, a ultraviolet blocker, a ultraviolet absorber, or another component.

低屈折率層形成用の塗布組成物の調製
上記各成分を用いて本発明で使用する塗布組成物を調製するには、塗工液の一般的な調製法に従って分散処理すればよい。例えば、各必須成分及び各所望成分を任意の順序で混合し、得られた混合物にビーズ等の媒体を投入し、ペイントシェーカーやビーズミル等で適切に分散処理することにより、コーティングのための低屈折率組成物が得られる。
Preparation of a coating composition for forming a low refractive index layer In order to prepare a coating composition used in the present invention using the above-described components, a dispersion treatment may be performed according to a general method for preparing a coating solution. For example, each essential component and each desired component are mixed in an arbitrary order, and a medium such as beads is added to the obtained mixture, and appropriately dispersed with a paint shaker or a bead mill to reduce the refractive index for coating. Rate composition is obtained.

光透過性基材フィルム
本発明の反射防止フィルムのベースとなるフィルムは、トリアセテートセルロース(TAC)、ポリエチレンテレフタレート(PET)、ジアセチルセルロース、アセテートブチレートセルロース、ポリエーテルサルホン、アクリル系樹脂;ポリウレタン系樹脂;ポリエステル;ポリカーボネート;ポリスルホン;ポリエーテル;トリメチルペンテン;ポリエーテルケトン;(メタ)アクリロニトリル等の各種樹脂で形成したフィルム等を例示することができる。基材の厚さは、通常25μm〜1000μm程度であり、好ましくは50μm〜200μmである。
Light transmissive substrate film The film which is the base of the antireflection film of the present invention is triacetate cellulose (TAC), polyethylene terephthalate (PET), diacetyl cellulose, acetate butyrate cellulose, polyethersulfone, acrylic resin; polyurethane Examples include resins, polyesters, polycarbonates, polysulfones, polyethers, trimethylpentene, polyether ketones, films formed of various resins such as (meth) acrylonitrile, and the like. The thickness of a base material is about 25 micrometers-1000 micrometers normally, Preferably it is 50 micrometers-200 micrometers.

低屈折率層の形成
本発明で使用する低屈折率層形成用の塗布組成物を用いて塗膜を形成するには、前記塗布組成物を被塗工体である前記した光透過性基材フィルムの表面に直接、又はハードコート層や光透過性の防眩層等の他の層を介して塗布し乾燥し、電離放射線、及び/又は加熱により硬化させる。
Formation of Low Refractive Index Layer In order to form a coating film using the coating composition for forming a low refractive index layer used in the present invention, the above-described light-transmitting substrate, which is the coating object, is used as the coating composition. The film is applied directly to the surface of the film or through another layer such as a hard coat layer or a light transmissive antiglare layer, dried, and cured by ionizing radiation and / or heating.

反射防止フィルム
本発明において得られる反射防止フィルムにおいて、前記他の層として、反射防止フィルムに耐擦傷性、強度等のハード性能を与える目的でハードコート層を設けても良い。或いは、反射防止フィルムに防眩性を与える目的で、他の層として、防眩層を設けても良い。
Antireflection film In the antireflection film obtained in the present invention, a hard coat layer may be provided as the other layer for the purpose of imparting hard performance such as scratch resistance and strength to the antireflection film. Alternatively, an antiglare layer may be provided as another layer for the purpose of imparting antiglare properties to the antireflection film.

図1は、本発明の反射防止フィルムの一例の断面を模式的に示したものである。反射防止フィルム1は、光透過性を有する基材フィルム11の一面側に、高屈折率層12を形成し、さらに該高屈折率層12の上に本発明に使用する低屈折率組成物を塗布して低屈折率層13を設けたものである。この例では、互いに屈折率の異なる光透過層は高屈折率層12と低屈折率層13の二層だけだが、光透過層を三層以上設けてもよい。その場合には、低屈折率層13だけでなく中屈折率層も、本発明に使用する低屈折率組成物を塗布して形成することができる。   FIG. 1 schematically shows a cross section of an example of the antireflection film of the present invention. The antireflection film 1 is formed by forming a high refractive index layer 12 on one surface side of a base film 11 having optical transparency, and further forming a low refractive index composition used in the present invention on the high refractive index layer 12. The low refractive index layer 13 is provided by coating. In this example, there are only two light transmissive layers having different refractive indexes, ie, a high refractive index layer 12 and a low refractive index layer 13, but three or more light transmissive layers may be provided. In that case, not only the low refractive index layer 13 but also the middle refractive index layer can be formed by applying the low refractive index composition used in the present invention.

下記の実施例1、2、及び比較例1〜3で得られた反射防止フィルムについて、ヘイズ、表面粗さRa、Rz、反射Y値、耐擦傷性(硬度)については次の方法により評価を行った。 About the antireflection film obtained in the following Examples 1 and 2 and Comparative Examples 1 to 3 , haze, surface roughness Ra, Rz, reflection Y value, and scratch resistance (hardness) are evaluated by the following methods. went.

ヘイズ
JIS K 7136に準拠し、反射・ 透過率計(村上色彩技術研究所:HR-100)を用い、ヘイズを測定した。
Haze
In accordance with JIS K 7136, haze was measured using a reflection / transmittance meter (Murakami Color Research Laboratory: HR-100).

表面粗さ
走査型プローブ顕微鏡(NanoScope III:デジタルインスツルメンツ製)を用い、
走査範囲5 μm 四方にて測定した。
Using a surface roughness scanning probe microscope (NanoScope III: manufactured by Digital Instruments)
The measurement was performed in a scanning range of 5 μm square.

反射Y値
分光光度計(UVPC-3100,島津製作所(株)製)を用いて入射角5°の時の絶対反射率を測定し、反射Y値を算出した。
Using a reflection Y value spectrophotometer (UVPC-3100, manufactured by Shimadzu Corporation), the absolute reflectance at an incident angle of 5 ° was measured, and the reflection Y value was calculated.

耐擦傷性(硬度)試験
#0000のスチールウールを用い、200g/cm2 で30往復擦った時の傷の有無を目視により確認した。剥離したものを×、表面に傷が確認されたが剥離しなかったものを△、表面に傷が認められなかったものを○とした。
Using a steel wool of scratch resistance (hardness) test # 0000, the presence or absence of scratches was confirmed visually by rubbing 30 times at 200 g / cm 2 . The peeled material was marked with ×, the surface with scratches observed but not peeled was marked with Δ, and the surface without scratches was marked with ○.

比較例1
低屈折率層塗布組成物の調製
下記の組成の成分を配合して低屈折率層塗布組成物を調製した。
1)表面処理中空シリカゾル
(20%メチルイソブチルケトン溶液) 14.3重量部
2)ペンタエリスリトールトリアクリレート(PETA) 1.95重量部
3)イルガキュア907(チバスペシャリティケミカルズ社製) 0.1重量部
4)TSF4460(商品名、ジーイー東芝シリコーン社製:アルキルポリエーテル変性シリコーンオイル) 0.15重量部
5)メチルイソブチルケトン 83.5重量部
[ Comparative Example 1 ]
Preparation of low refractive index layer coating composition The components of the following composition were blended to prepare a low refractive index layer coating composition.
1) Surface-treated hollow silica sol (20% methyl isobutyl ketone solution) 14.3 parts by weight
2) Pentaerythritol triacrylate (PETA) 1.95 parts by weight
3) Irgacure 907 (Ciba Specialty Chemicals) 0.1 parts by weight
4) TSF4460 (trade name, manufactured by GE Toshiba Silicone Co., Ltd .: alkyl polyether-modified silicone oil) 0.15 parts by weight
5) Methyl isobutyl ketone 83.5 parts by weight

ハードコート層形成用組成物の調製
下記の組成の成分を配合してハードコート層形成用組成物を調製した。
ペンタエリスリトールトリアクリレート(PETA) 5.0質量部
イルガキュア184(チバスペシャリティケミカルズ社製) 0.25質量部
メチルイソブチルケトン 94.75質量部
Preparation of composition for forming a hard coat layer A composition for forming a hard coat layer was prepared by blending the following components.
Pentaerythritol triacrylate (PETA) 5.0 parts by mass Irgacure 184 (manufactured by Ciba Specialty Chemicals) 0.25 parts by mass Methyl isobutyl ketone 94.75 parts by mass

基材/低屈折率層フィルムの作製
厚み80μmのトリアセテートセルロース(TAC)フィルム上に,上記組成のハードコート層形成用組成物をバーコーティングし、乾燥により溶剤を除去した後,紫外線照射装置(フュージョンUVシステムジャパン(株),光源Hパルプ)を用いて、照射線量100mJ/cm2 で紫外線照射を行い,ハードコート層を硬化させて、膜厚2〜5μmのハードコート層を有する、基材/ハードコートからなる積層フィルムを得た。
Preparation of base material / low refractive index layer film A hard coating layer forming composition having the above composition is bar-coated on a triacetate cellulose (TAC) film having a thickness of 80 μm, and after removing the solvent by drying, an ultraviolet irradiation device (fusion) UV system Japan Co., Ltd., light source H pulp) is used to irradiate ultraviolet rays at an irradiation dose of 100 mJ / cm 2 to cure the hard coat layer and to have a hard coat layer with a thickness of 2 to 5 μm. A laminated film consisting of a hard coat was obtained.

得られた基材/ハードコートからなる積層フィルム上に,上記の低屈折率層形成用組成物をバーコーティングし、乾燥させることより溶剤を除去した後、紫外線照射装置(フュージョンUVシステムジャパン(株),光源Hバルブ)を用いて,照射線量200mJ/cm2 で紫外線照射を行い、塗膜を硬化させて、基材/ハードコート/低屈折率層からなる反射防止フィルムを得た。得られた反射防止フィルムについて、ヘイズ、表面粗さ、反射Y値を測定し、耐擦傷試験(硬度)を行った。それらの結果を下記の表1に示す。 The resulting low-refractive-index layer-forming composition is bar-coated on the obtained base film / hard coat laminated film and dried to remove the solvent, and then an ultraviolet irradiation device (Fusion UV System Japan, Inc. ), A light source H bulb), ultraviolet irradiation was performed at an irradiation dose of 200 mJ / cm 2 , and the coating film was cured to obtain an antireflection film comprising a substrate / hard coat / low refractive index layer. About the obtained antireflection film, haze, surface roughness, reflection Y value were measured, and an abrasion resistance test (hardness) was performed. The results are shown in Table 1 below.

比較例2
前記比較例1の反射防止フィルムの製造方法における低屈折率層塗布組成物の1)〜4)の配合は同じで5)の溶剤を次の混合溶剤(メチルイソブチルケトン/N−ブタノール=8/2)に変更した以外は、全て前記比較例1と同じようにして反射防止フィルムを得た。
[ Comparative Example 2 ]
In the method for producing the antireflection film of Comparative Example 1, the compositions of 1) to 4) of the low refractive index layer coating composition were the same, and the solvent of 5) was changed to the following mixed solvent (methyl isobutyl ketone / N-butanol = 8 / An antireflection film was obtained in the same manner as in Comparative Example 1 except that it was changed to 2).

メチルイソブチルケトン 64.5重量部
N−ブタノール 19.0重量部
得られた反射防止フィルムについて、ヘイズ、表面粗さ、反射Y値を測定し、耐擦傷試験(硬度)を行った。それらの結果を下記の表1に示す。
Methyl isobutyl ketone 64.5 parts by weight N-butanol 19.0 parts by weight The obtained antireflection film was subjected to a scratch resistance test (hardness) by measuring haze, surface roughness and reflection Y value. The results are shown in Table 1 below.

実施例1
前記比較例1の反射防止フィルムの製造方法における低屈折率層塗布組成物の1)〜4)の配合は同じで5)の溶剤を次の混合溶剤(メチルイソブチルケトン/N−ブタノール=5/5)に変更した以外は、全て前記比較例1と同じようにして反射防止フィルムを得た。
[ Example 1 ]
In the method for producing the antireflection film of Comparative Example 1, the compositions of 1) to 4) of the low refractive index layer coating composition are the same, and the solvent of 5) is changed to the following mixed solvent (methyl isobutyl ketone / N-butanol = 5 / An antireflection film was obtained in the same manner as in Comparative Example 1 except that the procedure was changed to 5).

メチルイソブチルケトン 36.0重量部
N−ブタノール 47.5重量部
得られた反射防止フィルムについて、ヘイズ、表面粗さ、反射Y値を測定し、耐擦傷試験(硬度)を行った。それらの結果を下記の表1に示す。
Methyl isobutyl ketone 36.0 parts by weight N-butanol 47.5 parts by weight The obtained antireflection film was measured for haze, surface roughness, reflection Y value, and subjected to a scratch resistance test (hardness). The results are shown in Table 1 below.

実施例2
前記比較例1の反射防止フィルムの製造方法における低屈折率層塗布組成物の1)〜4)の配合は同じで5)の溶剤を次の混合溶剤(メチルイソブチルケトン/N−ブタノール=2/8)に変更した以外は、全て前記比較例1と同じようにして反射防止フィルムを得た。
[ Example 2 ]
In the method for producing an antireflection film of Comparative Example 1, the compositions of 1) to 4) of the low refractive index layer coating composition are the same, and the solvent of 5) is changed to the following mixed solvent (methyl isobutyl ketone / N-butanol = 2 / An antireflection film was obtained in the same manner as in Comparative Example 1 except that it was changed to 8).

メチルイソブチルケトン 7.5重量部
N−ブタノール 76.0重量部
得られた反射防止フィルムについて、ヘイズ、表面粗さ、反射Y値を測定し、耐擦傷試験(硬度)を行った。それらの結果を下記の表1に示す。
Methyl isobutyl ketone 7.5 parts by weight N-butanol 76.0 parts by weight The obtained antireflection film was subjected to a scratch resistance test (hardness) by measuring haze, surface roughness, and reflection Y value. The results are shown in Table 1 below.

Figure 0004632403
Figure 0004632403

表1によれば、実施例1、2の結果より表面粗さRaが2nm以下であるような低屈折率層を設けることにより、透明性に優れた反射防止フィルムを形成できることが分かる。また、中空微粒子を用いることにより、上記のような平滑な膜であっても、十分に反射防止性能を達成することができ、また塗膜自体の硬さも維持することが可能であることがわかる。 According to Table 1, it can be seen from the results of Examples 1 and 2 that an antireflection film excellent in transparency can be formed by providing a low refractive index layer having a surface roughness Ra of 2 nm or less. Further, it can be seen that by using the hollow fine particles, even the smooth film as described above can sufficiently achieve the antireflection performance and can maintain the hardness of the coating film itself. .

本発明の反射防止フィルムにおける低屈折率層は低屈折率であると同時に透明性において優れ、得られた反射防止フィルムは反射防止性に優れると同時に透明性に優れるため、本発明の反射防止フィルムは、特に、液晶表示装置(LCD)や陰極管表示装置(CRT)、プラズマディスプレイパネル(PDP)、エレクトロルミネッセンスディスプレイ(ELD)等の画像表示装置の表示面を被覆する多層型反射防止膜の少なくとも一層、特に低屈折率層を形成するのに好適である。   Since the low refractive index layer in the antireflection film of the present invention has a low refractive index and excellent transparency, the obtained antireflection film is excellent in antireflection and simultaneously excellent in transparency. In particular, at least a multilayer antireflection film covering the display surface of an image display device such as a liquid crystal display device (LCD), a cathode ray tube display device (CRT), a plasma display panel (PDP), an electroluminescence display (ELD) or the like. It is suitable for forming a single layer, particularly a low refractive index layer.

本発明の塗膜を含んだ反射防止フィルムの一例の断面を模式的に示した図である。It is the figure which showed typically the cross section of an example of the antireflection film containing the coating film of this invention.

符号の説明Explanation of symbols

1 反射防止フィルム
11 基材フィルム
12 高屈折率層
13 低屈折率層
DESCRIPTION OF SYMBOLS 1 Antireflection film 11 Base film 12 High refractive index layer 13 Low refractive index layer

Claims (4)

光透過性の基材フィルムの少なくとも一面側に、直接或いは他の層を介して、粒子径5nm〜300nmの中空シリカ微粒子或いは多孔質シリカ微粒子と、電離放射線硬化型樹脂と、水系有機溶剤が50%以上80%以下の比率の有機溶剤と、レベリング剤としてポリエーテル変性シリコーンオイルを含有する樹脂組成物を用いて低屈折率層が形成されたコンピュータ及び/又はディスプレイ用の反射防止フィルム。 50 or more of hollow silica fine particles or porous silica fine particles having a particle diameter of 5 nm to 300 nm, ionizing radiation curable resin, and water-based organic solvent are directly or via another layer on at least one side of the light-transmitting base film. An antireflection film for a computer and / or display in which a low refractive index layer is formed using a resin composition containing an organic solvent in a ratio of from 80% to 80% and a polyether-modified silicone oil as a leveling agent . 前記電離放射線硬化型樹脂は、ペンタエリスリトールトリアクリレートであり、前記有機溶剤は、水系有機溶剤がノルマルブタノールであり、水系有機溶剤以外の有機溶剤がメチルイソブチルケトンである請求項1に記載の反射防止フィルム。   The antireflection according to claim 1, wherein the ionizing radiation curable resin is pentaerythritol triacrylate, the organic solvent is a normal organic butanol, and an organic solvent other than the aqueous organic solvent is methyl isobutyl ketone. the film. 前記中空シリカ微粒子或いは多孔質シリカ微粒子は低屈折率層中に分散しており、平均孔径0.01nm〜100nmの空気を含有する孔を有し、屈折率1.20〜1.45であり、形成された低屈折率層の表面の算術平均粗さRaが1nm以上2nm未満、Rzが9.1nm以上10.9nm未満であり、該積層体としてのヘーズが0.3未満である請求項1又は2に記載の反射防止フィルム。 The hollow silica fine particles or porous silica fine particles have been distributed in the low refractive index layer having a hole containing air having an average pore diameter of 0.01Nm~100nm, it is a refractive index 1.20 to 1.45 The arithmetic average roughness Ra of the surface of the formed low refractive index layer is 1 nm or more and less than 2 nm, Rz is 9.1 nm or more and less than 10.9 nm, and the haze as the laminate is less than 0.3. The antireflection film as described in 1 or 2. 前記ポリエーテル変性シリコーンオイルは、アルキルポリエーテル変性シリコーンオイルである請求項1、2又は3に記載の反射防止フィルム。The antireflection film according to claim 1, wherein the polyether-modified silicone oil is an alkyl polyether-modified silicone oil.
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