JP2010159373A - Near-infrared absorbing self-adhesive and near-infrared shielding film - Google Patents
Near-infrared absorbing self-adhesive and near-infrared shielding film Download PDFInfo
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Abstract
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本発明は、例えばプラズマディスプレイパネル（ＰＤＰ）に適用され、リモートコントロール機器等の周辺機器の誤動作を招く近赤外線を遮蔽する近赤外線吸収機能を粘着層に付与することができる近赤外線吸収性粘着剤及び近赤外線遮蔽フィルムに関する。 The present invention is applied to, for example, a plasma display panel (PDP), and a near-infrared absorbing adhesive capable of imparting a near-infrared absorbing function that shields near-infrared rays that cause malfunction of peripheral devices such as remote control devices to an adhesive layer And a near-infrared shielding film.
近年の高度情報化社会において、電子ディスプレイ等の光エレクトロニクス機器はテレビジョンやパーソナルコンピュータのモニター用等として著しい進歩を遂げ、広く普及している。中でもプラズマディスプレイパネルは電子ディスプレイパネルの大型化や薄型化に伴って注目を浴びているが、動作原理上発せられる近赤外線によってリモートコントロール機器等の周辺機器の誤動作を招くといった問題がある。また、薄型化や軽量化のためには種々の機能の複合化や部材点数の削減をしなければならないという問題もある。 In an advanced information society in recent years, optoelectronic devices such as electronic displays have made remarkable progress and are widely used for monitors of televisions and personal computers. In particular, plasma display panels are attracting attention as electronic display panels become larger and thinner. However, there is a problem in that peripheral devices such as remote control devices may malfunction due to near-infrared rays generated on the principle of operation. In addition, there is a problem that various functions must be combined and the number of members must be reduced in order to reduce the thickness and weight.
これらの問題を解決するために、ＰＤＰに用いられる光学フィルタには近赤外線吸収層が設けられ、さらに粘着機能との複合化が検討されている。具体的には、ＰＤＰの視認側に設置されて用いられる光学フィルタとして、近赤外線吸収色素とシリコーン系粘着剤を含有する近赤外線吸収性粘着剤組成物が提案されている（特許文献１を参照）。ところが、この特許文献１に記載されている発明では、粘着剤としてシリコーン系粘着剤を使用しているため近赤外線吸収色素の吸収能の劣化は抑えられるものの、被着体によっては該被着体との密着力が不足し、安定的に接着状態を維持することができないという問題があった。 In order to solve these problems, a near-infrared absorbing layer is provided in an optical filter used in a PDP, and a composite with an adhesive function is being studied. Specifically, a near-infrared absorbing pressure-sensitive adhesive composition containing a near-infrared absorbing dye and a silicone-based pressure-sensitive adhesive has been proposed as an optical filter that is installed and used on the viewing side of a PDP (see Patent Document 1). ). However, in the invention described in Patent Document 1, since the silicone adhesive is used as the adhesive, the deterioration of the absorption ability of the near-infrared absorbing dye can be suppressed, but depending on the adherend, the adherend There is a problem that the adhesive force is not sufficient and the adhesion state cannot be stably maintained.
また、近赤外線吸収色素であるジイモニウム塩化合物を含有する粘着層が剥離フィルムで挟持されている近赤外線吸収性粘着フィルムが提案されている（特許文献２を参照）。しかしながら、特許文献２に記載されている発明では、粘着剤としてアクリル系樹脂粘着剤が好適に用いられるため被着体との密着力は確保されるものの、アクリル系樹脂粘着剤に含まれるアクリル系樹脂の酸価が特定されていない。そのため、近赤外線吸収色素によってはその吸収能の劣化が著しく、安定的に近赤外線吸収能を発現させることができないという問題があった。さらには、アクリル系樹脂粘着剤に含まれるアクリル系樹脂の酸価が高い場合には、金属メッシュ層を被着体とした場合に当該層の腐食を著しく促進してしまい、十分な電磁波遮蔽能を維持することが困難であった。 Further, a near-infrared absorbing adhesive film in which an adhesive layer containing a diimonium salt compound that is a near-infrared absorbing dye is sandwiched between release films has been proposed (see Patent Document 2). However, in the invention described in Patent Document 2, an acrylic resin pressure-sensitive adhesive is suitably used as the pressure-sensitive adhesive, so that adhesion to the adherend is ensured, but the acrylic resin included in the acrylic resin pressure-sensitive adhesive is used. The acid value of the resin is not specified. For this reason, there is a problem in that the near-infrared absorbing dye has a remarkable deterioration in the absorptivity, and the near-infrared absorptivity cannot be stably expressed. Furthermore, when the acrylic resin contained in the acrylic resin pressure-sensitive adhesive has a high acid value, when the metal mesh layer is used as an adherend, corrosion of the layer is remarkably accelerated, and sufficient electromagnetic wave shielding ability is achieved. It was difficult to maintain.
さらに、基材と、その一方の面に配置された近赤外線吸収層と、その上に配置された粘着剤層とを備えた近赤外線遮蔽体が提案されている（特許文献３を参照）。該近赤外線遮蔽体の粘着剤層はカルボキシル基を含む樹脂により形成され、その樹脂の酸価が２０ｍｇＫＯＨ／ｇ以下に設定されている。しかし、特許文献３に記載されている発明では、近赤外線吸収層の劣化は防止できるものの、ガラスや金属メッシュ等の被着体に一旦貼着させてしまうと貼り直し等のために剥がそうとした際に近赤外線吸収層と粘着剤層との界面で糊残りがある状態で剥離が生じてしまう。従って、再度粘着剤層を近赤外線吸収層に貼着させることができない（リワーク性が悪い）という問題があった。 Furthermore, a near-infrared shield including a base material, a near-infrared absorbing layer disposed on one surface thereof, and a pressure-sensitive adhesive layer disposed thereon has been proposed (see Patent Document 3). The pressure-sensitive adhesive layer of the near infrared shielding body is formed of a resin containing a carboxyl group, and the acid value of the resin is set to 20 mgKOH / g or less. However, in the invention described in Patent Document 3, although the deterioration of the near-infrared absorbing layer can be prevented, once it is attached to an adherend such as glass or a metal mesh, it tends to be peeled off for reattachment or the like. When this occurs, peeling occurs in the state where there is adhesive residue at the interface between the near infrared absorption layer and the pressure-sensitive adhesive layer. Therefore, there has been a problem that the pressure-sensitive adhesive layer cannot be adhered to the near-infrared absorbing layer again (reworkability is poor).
そこで本発明の目的とするところは、ガラスや金属メッシュ等の被着体との接着力が十分に保持され、近赤外線吸収色素や金属メッシュの腐食を防止して十分な近赤外線吸収能と電磁波遮蔽能が維持され、かつリワーク性が良好である近赤外線吸収性粘着剤及び近赤外線遮蔽フィルムを提供することにある。 Therefore, the object of the present invention is to maintain sufficient adhesive strength with adherends such as glass and metal mesh, to prevent corrosion of near-infrared absorbing pigments and metal mesh, and to provide sufficient near-infrared absorbing ability and electromagnetic waves. An object of the present invention is to provide a near-infrared absorbing adhesive and a near-infrared shielding film that have good shielding ability and good reworkability.
本発明における第１の発明の近赤外線吸収性粘着剤は、（メタ）アクリル系粘着樹脂組成物と、近赤外線吸収色素とを含有するものである。そして、前記（メタ）アクリル系粘着樹脂組成物は酸価が２０ｍｇＫＯＨ／ｇ以下の（メタ）アクリル系樹脂と、イソシアネート系架橋剤と、酸化防止剤とを含み、前記近赤外線吸収色素はジイモニウム系色素、フタロシアニン系色素及びジチオール系色素の中から選ばれる1種以上であることを特徴とする。 The near-infrared-absorbing pressure-sensitive adhesive of the first invention in the present invention contains a (meth) acrylic pressure-sensitive adhesive resin composition and a near-infrared absorbing dye. The (meth) acrylic adhesive resin composition includes a (meth) acrylic resin having an acid value of 20 mgKOH / g or less, an isocyanate crosslinking agent, and an antioxidant, and the near-infrared absorbing dye is a diimonium-based dye. It is one or more selected from a dye, a phthalocyanine dye, and a dithiol dye.
第２の発明の近赤外線吸収性粘着剤は、第１の発明において、前記（メタ）アクリル系粘着樹脂組成物は（メタ）アクリル系樹脂１００質量部に対して、イソシアネート系架橋剤０．１〜５．０質量部と、酸化防止剤０．１〜５．０質量部とを含み、さらに近赤外線吸収色素は（メタ）アクリル系樹脂１００質量部に対して０．５〜３．０質量部含むものである。 In the first invention, the near-infrared absorbing pressure-sensitive adhesive of the second invention is the isocyanate-based cross-linking agent 0.1 in the (meth) acrylic pressure-sensitive resin composition with respect to 100 parts by weight of the (meth) acrylic resin. -5.0 mass parts and 0.1-5.0 mass parts of antioxidants, and the near-infrared absorbing dye is 0.5-3.0 mass parts with respect to 100 mass parts of (meth) acrylic resin. Part.
第３の発明の近赤外線吸収性粘着剤は、第１又は第２の発明において、前記近赤外線吸収色素がフタロシアニン系色素であることを特徴とする。
第４の発明の近赤外線吸収性粘着剤は、第１から第３のいずれか１項の発明において、さらに光の波長３８０〜７８０ｎｍの領域に極大吸収波長を有する色補正色素を含有するものである。
The near-infrared absorbing adhesive of the third invention is characterized in that, in the first or second invention, the near-infrared absorbing dye is a phthalocyanine dye.
The near-infrared absorptive adhesive of 4th invention contains the color correction pigment | dye which has maximum absorption wavelength in the area | region of wavelength 380-780 nm of light in 1st to 3rd invention. is there.
第５の発明の近赤外線遮蔽フィルムは、第１から第４のいずれか１項に記載の近赤外線吸収性粘着剤が透明基材の一方の面に施されて粘着層が形成されているものである。 The near-infrared shielding film of 5th invention is a thing with which the near-infrared absorptive adhesive of any one of 1st to 4th is given to one surface of a transparent base material, and the adhesion layer is formed It is.
本発明の近赤外線吸収性粘着剤は、次のような効果を発揮することができる。
・ ガラスや金属メッシュ等の被着体に対する接着力を十分に保持することができる。
・ 近赤外線吸収色素の劣化を抑え、近赤外線吸収能を維持することができる。
The near-infrared absorbing adhesive of the present invention can exhibit the following effects.
-Sufficient adhesion to adherends such as glass and metal mesh can be maintained.
-It is possible to suppress the deterioration of the near-infrared absorbing dye and maintain the near-infrared absorbing ability.
・ 金属メッシュ等の腐食を抑制して電磁波遮蔽能を保持することができる。
・ ガラスや金属メッシュ等の被着体に一旦貼着させて貼り直しのために剥がしても糊残り無く剥離されるため、再貼着することができる。
-It can keep the electromagnetic wave shielding ability by suppressing corrosion of metal mesh.
-Even if it is once attached to an adherend such as glass or a metal mesh and then peeled off for reattachment, it is peeled off without any adhesive residue, so it can be reattached.
従って、本発明の近赤外線吸収性粘着剤によれば、ガラスや金属メッシュ等の被着体との接着力が十分に保持され、近赤外線吸収色素や金属メッシュの腐食を防止して十分な近赤外線吸収能と電磁波遮蔽能を維持することができ、かつリワーク性を良好にすることができる。 Therefore, according to the near-infrared absorbing pressure-sensitive adhesive of the present invention, the adhesive strength with an adherend such as glass or metal mesh is sufficiently maintained, and corrosion of the near-infrared absorbing dye or metal mesh is prevented and sufficient near Infrared absorption ability and electromagnetic wave shielding ability can be maintained, and reworkability can be improved.
以下、本発明を具体化した実施形態について詳細に説明する。
本実施形態の近赤外線吸収性粘着剤は、（メタ）アクリル系粘着樹脂組成物と、近赤外線吸収色素とを含有する粘着剤である。そして、（メタ）アクリル系粘着樹脂組成物は、酸価が２０ｍｇＫＯＨ／ｇ以下の（メタ）アクリル系樹脂と、イソシアネート系架橋剤と、酸化防止剤とを含有する。また、近赤外線吸収色素はジイモニウム系色素、フタロシアニン系色素及びジチオール系色素の中から選ばれる1種以上である。この近赤外線吸収性粘着剤が透明基材の一方の面に施されて粘着層が形成され、近赤外線遮蔽フィルムが得られる。次に、この近赤外線吸収性粘着剤及び近赤外線遮蔽フィルムの構成要素について順に説明する。
＜（メタ）アクリル系粘着樹脂組成物＞
〔（メタ）アクリル系樹脂〕
（メタ）アクリル系樹脂は酸価が２０ｍｇＫＯＨ／ｇ以下であり、好ましくは１５ｍｇＫＯＨ／ｇ以下である。この酸価が２０ｍｇＫＯＨ／ｇより大きい場合には、（メタ）アクリル系樹脂に近赤外線吸収色素を添加した際に近赤外線吸収色素の劣化が促進され、さらには近赤外線吸収性粘着剤による粘着層を銅メッシュ等の金属メッシュ上に形成した際に金属メッシュの酸化劣化が促進されるため不適当である。
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The near-infrared absorptive adhesive of this embodiment is an adhesive containing a (meth) acrylic adhesive resin composition and a near-infrared absorbing dye. The (meth) acrylic adhesive resin composition contains a (meth) acrylic resin having an acid value of 20 mgKOH / g or less, an isocyanate cross-linking agent, and an antioxidant. The near-infrared absorbing dye is at least one selected from diimonium dyes, phthalocyanine dyes, and dithiol dyes. This near-infrared absorbing adhesive is applied to one surface of the transparent substrate to form an adhesive layer, and a near-infrared shielding film is obtained. Next, the components of the near infrared absorbing adhesive and the near infrared shielding film will be described in order.
<(Meth) acrylic adhesive resin composition>
[(Meth) acrylic resin]
The (meth) acrylic resin has an acid value of 20 mgKOH / g or less, preferably 15 mgKOH / g or less. When this acid value is larger than 20 mgKOH / g, the deterioration of the near-infrared absorbing dye is promoted when the near-infrared absorbing dye is added to the (meth) acrylic resin, and the adhesive layer is made of a near-infrared absorbing adhesive. Is formed on a metal mesh such as a copper mesh, which is unsuitable because oxidative degradation of the metal mesh is promoted.
（メタ）アクリル系樹脂を形成する単量体は特に制限されず、例えばメチル（メタ）アクリレート、ブチル（メタ）アクリレート等のアルキル（メタ）アクリレートと（メタ）アクリル酸とを重合した重合体を用いることができる。また、（メタ）アクリレートの他に、例えばエチレン、酢酸ビニル、スチレン等の不飽和二重結合を有するオレフィン系単量体、ビニル系単量体との共重合体も用いることができる。 The monomer that forms the (meth) acrylic resin is not particularly limited. For example, a polymer obtained by polymerizing an alkyl (meth) acrylate such as methyl (meth) acrylate or butyl (meth) acrylate and (meth) acrylic acid is used. Can be used. In addition to (meth) acrylate, for example, an olefin monomer having an unsaturated double bond such as ethylene, vinyl acetate, styrene, or a copolymer with a vinyl monomer can also be used.
前記（メタ）アクリル系樹脂は、（メタ）アクリル酸のほか、例えば２−ヒドロキシエチル（メタ）アクリレート等の水酸基を有する単量体や、マレイン酸、イタコン酸、クロトン酸等のカルボキシル基を有する単量体等のイソシアネート系架橋剤のイソシアネート基と反応する官能基を有する単量体を含有させて形成されていても良い。これにより、該官能基を有する単量体が前記（メタ）アクリル酸と共重合して官能基を有する（メタ）アクリル系樹脂を得ることができ、この官能基がイソシアネート系架橋剤のイソシアネート基と反応して架橋構造を形成し、近赤外線吸収性粘着剤による粘着層の機械的強度等を高めることができる。
〔イソシアネート系架橋剤〕
（メタ）アクリル系粘着樹脂組成物にはイソシアネート系架橋剤が含まれ、このイソシアネート系架橋剤により近赤外線吸収性粘着剤の粘着性能の向上と近赤外線吸収色素の劣化防止のバランスを保つことが可能になる。イソシアネート系架橋剤は特に制限されず、例えばトリレンジイソシアネート、ヘキサメチレンジイソシアネート等、イソシアネート基を複数有する多官能イソシアネート系化合物を用いることができる。
In addition to (meth) acrylic acid, the (meth) acrylic resin has a hydroxyl group monomer such as 2-hydroxyethyl (meth) acrylate and a carboxyl group such as maleic acid, itaconic acid, and crotonic acid. It may be formed by containing a monomer having a functional group that reacts with an isocyanate group of an isocyanate-based crosslinking agent such as a monomer. Thereby, the monomer having the functional group can be copolymerized with the (meth) acrylic acid to obtain a (meth) acrylic resin having a functional group, and the functional group is an isocyanate group of the isocyanate crosslinking agent. It forms a cross-linked structure by reacting with, and the mechanical strength and the like of the adhesive layer by the near infrared absorbing adhesive can be increased.
[Isocyanate-based crosslinking agent]
The (meth) acrylic pressure-sensitive adhesive resin composition contains an isocyanate-based cross-linking agent, and this isocyanate-based cross-linking agent can maintain a balance between improving the adhesive performance of the near-infrared absorbing adhesive and preventing the deterioration of the near-infrared absorbing dye. It becomes possible. The isocyanate-based crosslinking agent is not particularly limited, and for example, a polyfunctional isocyanate-based compound having a plurality of isocyanate groups such as tolylene diisocyanate and hexamethylene diisocyanate can be used.
イソシアネート系架橋剤の含有量は、前記（メタ）アクリル系樹脂１００質量部に対して０．１〜５．０質量部であることが好ましく、０．２〜３．０質量部であることがさらに好ましい。イソシアネート系架橋剤の含有量が０．１質量部により少ない場合には、近赤外線吸収性粘着剤による粘着層の機械的強度や粘着性能が不十分になる傾向を示す。その一方、５．０質量部より多い場合には、過剰のイソシアネート系架橋剤が近赤外線吸収色素等と反応して粘着層の劣化を促進するため好ましくない。
〔酸化防止剤〕
（メタ）アクリル系粘着樹脂組成物には酸化防止剤が含まれ、該酸化防止剤により銅メッシュ等の金属メッシュに近赤外線吸収性粘着剤の粘着層が形成された際に金属メッシュの酸化劣化を防止することが可能になる。
It is preferable that content of an isocyanate type crosslinking agent is 0.1-5.0 mass parts with respect to 100 mass parts of said (meth) acrylic-type resins, and it is 0.2-3.0 mass parts. Further preferred. When the content of the isocyanate-based crosslinking agent is less than 0.1 parts by mass, the mechanical strength and adhesive performance of the adhesive layer with the near-infrared absorbing adhesive tend to be insufficient. On the other hand, when the amount is more than 5.0 parts by mass, an excess of the isocyanate-based crosslinking agent reacts with a near-infrared absorbing dye or the like to promote deterioration of the adhesive layer, which is not preferable.
〔Antioxidant〕
The (meth) acrylic adhesive resin composition contains an antioxidant, and when the adhesive layer of the near infrared absorbing adhesive is formed on a metal mesh such as a copper mesh by the antioxidant, the metal mesh is oxidized and deteriorated. Can be prevented.
酸化防止剤としては特に制限されず従来公知のもので良く、例えば２，６−ジ−ブチル−４−ヒドロキシフェノール等のフェノール系酸化防止剤（ヒンダードフェノール系酸化防止剤）、ジステアリルチオジプロピオネート等の硫黄系酸化防止剤、トリフェニルホスファイト等のリン系酸化防止剤等が使用される。酸化防止剤の含有量は前記（メタ）アクリル系樹脂１００質量部に対して０．１〜５．０質量部が好ましく、０．２〜３．０質量部がさらに好ましい。酸化防止剤の含有量が０．１質量部より少ない場合、金属メッシュの酸化劣化を防止する機能を十分に発揮することができなくなる。一方、その含有量が５．０質量部より多い場合、近赤外線吸収性粘着剤の粘着性能が低下するなどの弊害を招くおそれがある。
＜近赤外線吸収色素＞
次に、近赤外線吸収性粘着剤に含まれる近赤外線吸収色素はジイモニウム系色素、フタロシアニン系色素及びジチオール系色素の中から選ばれる1種以上が用いられる。これらの近赤外線吸収色素は光の波長８００〜１１００ｎｍに極大吸収波長を有するため可視光線を不必要に吸収することがなく、ＰＤＰに使用する上で十分な近赤外線吸収能を発揮することができる。
The antioxidant is not particularly limited and may be a conventionally known one. For example, a phenolic antioxidant (hindered phenolic antioxidant) such as 2,6-di-butyl-4-hydroxyphenol, distearylthiodipro Sulfur-based antioxidants such as pionate and phosphorus-based antioxidants such as triphenyl phosphite are used. The content of the antioxidant is preferably 0.1 to 5.0 parts by mass, more preferably 0.2 to 3.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. When the content of the antioxidant is less than 0.1 parts by mass, the function of preventing oxidative deterioration of the metal mesh cannot be sufficiently exhibited. On the other hand, when the content is more than 5.0 parts by mass, there is a risk of adverse effects such as a decrease in the adhesive performance of the near infrared absorbing adhesive.
<Near-infrared absorbing dye>
Next, as the near-infrared absorbing dye contained in the near-infrared absorbing adhesive, one or more selected from diimonium dyes, phthalocyanine dyes and dithiol dyes are used. Since these near-infrared absorbing dyes have a maximum absorption wavelength at a light wavelength of 800 to 1100 nm, they do not unnecessarily absorb visible light, and can exhibit sufficient near-infrared absorbing ability for use in PDPs. .
これらの近赤外線吸収色素は特に制限されず、従来公知の化合物又は市販品を用いることができる。そのようなジイモニウム系色素としては、例えばＣＩＲ−１０８５、ＣＩＲ−ＲＬ〔以上、日本カーリット（株）製のジイモニウム系色素の商品名〕、ＩＲＧ−０２２、ＩＲＧ−０６７〔以上、日本化薬（株）製のジイモニウム系色素の商品名〕等、フタロシアニン系色素としては、例えばイーエクスカラーＩＲ−１０Ａ、イーエクスカラーＩＲ−１２、イーエクスカラーＩＲ−１４、ＴＸ−ＥＸ−８２０、ＴＸ−ＥＸ−９０６Ｂ、ＴＸ−ＥＸ−９１０Ｂ、ＴＸ−ＥＸ−９１５〔以上、（株）日本触媒製のフタロシアニン系色素の商品名〕等、ジチオール系色素としては、例えばＳＤ１５１―Ｊ１０Ｎ〔以上、住友精化工業（株）製のジチオール系色素の商品名〕、ＳＩＲ−１２８、ＳＩＲ−１３０、ＳＩＲ−１３２、ＳＩＲ−１５９〔以上、三井化学（株）製のジチオール系色素の商品名〕等がそれぞれ挙げられる。これらの中でも、フタロシアニン系色素がその耐久性能に優れている点から好ましい。この場合、近赤外線吸収色素としてフタロシアニン系色素のみを用いることが最も好ましい。また、本発明の効果を損なわない限り、その他の近赤外線吸収色素を用いることもできる。 These near-infrared absorbing dyes are not particularly limited, and conventionally known compounds or commercially available products can be used. Examples of such diimonium dyes include CIR-1085, CIR-RL [above, trade names of diimonium dyes manufactured by Nippon Carlit Co., Ltd.], IRG-022, IRG-067 [above, Nippon Kayaku Co., Ltd. The product name of the dimonium-based dyes] and the like, such as e-excolor IR-10A, e-excolor IR-12, e-excolor IR-14, TX-EX-820, TX-EX- Examples of dithiol dyes such as 906B, TX-EX-910B, TX-EX-915 [above, trade names of phthalocyanine dyes manufactured by Nippon Shokubai Co., Ltd.] include SD151-J10N [above, Sumitomo Seika Kogyo ( Trade name of dithiol-based dyes manufactured by Co., Ltd.], SIR-128, SIR-130, SIR-132, SIR-159 [above Product Name] and the like of Mitsui Chemicals Co., Ltd. of dithiol-based dyes, and the like, respectively. Of these, phthalocyanine dyes are preferred because of their excellent durability performance. In this case, it is most preferable to use only a phthalocyanine dye as the near infrared absorbing dye. In addition, other near infrared absorbing dyes can be used as long as the effects of the present invention are not impaired.
近赤外線吸収色素の含有量は、前記（メタ）アクリル系樹脂１００質量部に対して０．５〜３．０質量部が好ましい。該近赤外線吸収色素の含有量が０．５〜３．０質量部であれば実用上近赤外線吸収能と可視光線の透過率が十分な近赤外線吸収性粘着剤を得ることができる。近赤外線吸収色素の含有量が０．５質量部より少ない場合、近赤外線吸収能を十分に発揮することができず、可視光線の透過率も低下する傾向を示す。一方、その含有量が３．０質量部より多い場合、近赤外線吸収性粘着剤の粘着性能が低下するなどの傾向を示す。
＜色補正色素＞
また、近赤外線吸収性粘着剤には、光の波長３８０〜７８０ｎｍ（可視光線の波長域）の領域に極大吸収波長を有する色補正色素を含有させることができる。この色補正色素を含むことにより、近赤外線吸収性粘着剤をＰＤＰに使用した際に色再現性を向上させることができる。
The content of the near-infrared absorbing dye is preferably 0.5 to 3.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. When the content of the near-infrared absorbing dye is 0.5 to 3.0 parts by mass, a near-infrared absorbing pressure-sensitive adhesive having practically sufficient near-infrared absorbing ability and visible light transmittance can be obtained. When the content of the near-infrared absorbing dye is less than 0.5 parts by mass, the near-infrared absorbing ability cannot be sufficiently exhibited, and the visible light transmittance tends to decrease. On the other hand, when the content is more than 3.0 parts by mass, the adhesive performance of the near-infrared absorbing adhesive is reduced.
<Color correction dye>
Moreover, the near-infrared absorptive pressure-sensitive adhesive can contain a color correction dye having a maximum absorption wavelength in a region of light wavelength of 380 to 780 nm (visible light wavelength region). By including this color correction pigment, color reproducibility can be improved when a near-infrared absorbing adhesive is used in a PDP.
光の波長３８０〜７８０ｎｍの領域に極大吸収波長を有する色補正色素は特に制限されず、例えばＴＡＰ−２、ＴＡＰ−１８〔以上、山田化学工業（株）製のテトラアザポルフィリン系化合物〕等のアザポルフィリン系化合物、ＮＫ−８８６１、ＮＫ−８９０８〔以上、（株）林原生物化学研究所製のシアニン系化合物）等のシアニン系化合物、その他スクアリリウム系化合物、アゾメチン系化合物、ポリメチン系化合物、キサンテン系化合物、ピロメテン系化合物、イソインドリノン系化合物、キナクリドン系化合物、ジケトピロロピロール系化合物、アントラキノン系化合物、ジオキサジン系化合物等、従来公知の化合物を用いることができる。
＜近赤外線遮蔽フィルム＞
次に、近赤外線遮蔽フィルムは、前述の近赤外線吸収性粘着剤が透明基材の一方の面に施され、粘着層が形成されて構成されている。透明基材としては透明であれば特に制限されず、例えばポリエチレンテレフタレート（ＰＥＴ）フィルム、トリアセチルセルロース（ＴＡＣ）フィルム等の透明樹脂フィルムや、透明樹脂フィルム上にハードコート層、導電性ハードコート層、防汚層、耐指紋性層、反射防止層、アンチグレア層、透明導電層、書味向上性層、接着性改良層、屈折率調整層等の機能層が設けられた透明樹脂フィルム等、様々なものを用いることができる。これにより、近赤外線遮蔽フィルムは近赤外線吸収性能に加えて、様々な機能を発揮することが可能になる。
The color correction dye having a maximum absorption wavelength in the light wavelength region of 380 to 780 nm is not particularly limited, and examples thereof include TAP-2, TAP-18 [above, a tetraazaporphyrin-based compound manufactured by Yamada Chemical Co., Ltd.] and the like. Cyanine compounds such as azaporphyrin compounds, NK-8861, NK-8908 (and above, cyanine compounds manufactured by Hayashibara Biochemical Research Institute), other squarylium compounds, azomethine compounds, polymethine compounds, xanthene compounds Conventionally known compounds such as compounds, pyromethene compounds, isoindolinone compounds, quinacridone compounds, diketopyrrolopyrrole compounds, anthraquinone compounds, and dioxazine compounds can be used.
<Near-infrared shielding film>
Next, the near-infrared shielding film is configured by applying the above-described near-infrared absorbing adhesive to one surface of the transparent substrate to form an adhesive layer. The transparent substrate is not particularly limited as long as it is transparent. For example, a transparent resin film such as a polyethylene terephthalate (PET) film or a triacetyl cellulose (TAC) film, a hard coat layer or a conductive hard coat layer on the transparent resin film. Various types, such as antifouling layer, anti-fingerprint layer, anti-reflection layer, anti-glare layer, transparent conductive layer, writing quality improving layer, adhesion improving layer, refractive resin adjustment layer, etc. Can be used. Thereby, the near-infrared shielding film can exhibit various functions in addition to the near-infrared absorbing performance.
近赤外線吸収性粘着剤を透明基材上に設ける方法としてはウェットコート法であれば特に制限されず、例えばグラビアコート法、スピンコート法、ダイコート法等の従来公知の塗工方法を採用することができる。
＜実施形態により発揮される作用及び効果のまとめ＞
・ 本実施形態の近赤外線吸収性粘着剤においては、前記（メタ）アクリル系樹脂は酸価が２０ｍｇＫＯＨ／ｇ以下に抑えられている。このため、酸による近赤外線吸収色素の劣化を抑制することができ、近赤外線吸収能を維持することができると共に、被着体としての金属メッシュ等の腐食を抑制して接着力を維持することができる。同時に、金属メッシュのもつ電磁波遮蔽能を保持することができる。さらに、近赤外線吸収性粘着剤が金属メッシュ等の被着体に施されて粘着層が形成された後、該粘着層を剥離したとき糊残りなく剥離されるため、再度近赤外線吸収性粘着剤を金属メッシュ等に施して粘着層を形成することができる。
The method for providing the near-infrared absorbing adhesive on the transparent substrate is not particularly limited as long as it is a wet coating method. For example, a conventionally known coating method such as a gravure coating method, a spin coating method, or a die coating method may be employed. Can do.
<Summary of actions and effects exhibited by the embodiment>
-In the near-infrared absorptive adhesive of this embodiment, the acid value of the said (meth) acrylic-type resin is suppressed to 20 mgKOH / g or less. For this reason, deterioration of the near-infrared absorbing dye due to the acid can be suppressed, the near-infrared absorbing ability can be maintained, and corrosion of the metal mesh or the like as the adherend is suppressed to maintain the adhesive force. Can do. At the same time, the electromagnetic wave shielding ability of the metal mesh can be maintained. Furthermore, since the near-infrared absorbing adhesive is applied to an adherend such as a metal mesh to form an adhesive layer, and when the adhesive layer is peeled off, the adhesive layer is peeled off without any adhesive residue. Can be applied to a metal mesh or the like to form an adhesive layer.
加えて、（メタ）アクリル系粘着樹脂組成物を構成する酸化防止剤により、金属メッシュ等の被着体の酸化劣化を抑えることができ、粘着層の接着力と金属メッシュのもつ電磁波遮蔽能を保持することができる。さらに、近赤外線吸収色素はジイモニウム系色素、フタロシアニン系色素及びジチオール系色素の中から選ばれる1種以上が用いられ、これらの近赤外線吸収色素は光の波長８００〜１１００ｎｍの近赤外線領域に極大吸収波長を有し、可視光線を吸収することなく、近赤外線を十分に吸収することができる。 In addition, the antioxidant that constitutes the (meth) acrylic adhesive resin composition can suppress oxidative degradation of adherends such as metal meshes, and can provide the adhesive strength of the adhesive layer and the electromagnetic wave shielding ability of the metal mesh. Can be held. Furthermore, the near-infrared absorbing dye is one or more selected from diimonium dyes, phthalocyanine dyes and dithiol dyes, and these near-infrared absorbing dyes have maximum absorption in the near-infrared region of light having a wavelength of 800 to 1100 nm. It has a wavelength and can absorb near infrared rays sufficiently without absorbing visible rays.
従って、近赤外線吸収性粘着剤によれば、ガラスや金属メッシュ等の被着体との接着力が十分に保持され、近赤外線吸収色素や金属メッシュの腐食を防止して十分な近赤外線吸収能と電磁波遮蔽能を維持することができ、かつリワーク性を良好にすることができる。 Therefore, according to the near-infrared-absorbing pressure-sensitive adhesive, the adhesive strength with the adherend such as glass and metal mesh is sufficiently maintained, and the near-infrared absorbing ability is sufficient by preventing the corrosion of the near-infrared absorbing pigment and the metal mesh. The electromagnetic wave shielding ability can be maintained, and the reworkability can be improved.
・ 近赤外線吸収性粘着剤は、（メタ）アクリル系粘着樹脂組成物が（メタ）アクリル系樹脂１００質量部に対して、イソシアネート系架橋剤０．１〜５．０質量部と、酸化防止剤０．１〜５．０質量部とを含み、さらに近赤外線吸収色素が（メタ）アクリル系樹脂１００質量部に対して０．５〜３．０質量部含む。この近赤外線吸収性粘着剤から粘着層を形成した場合、周辺機器の誤動作を防ぐのに十分な近赤外線吸収能を発揮することができ、金属メッシュ等に貼着した場合に金属メッシュによる電磁波遮蔽能の劣化を防止して人体に悪影響を与えない程度までの電磁波遮蔽能を発揮することができる。 -Near-infrared absorptive adhesive is an antioxidant based on 0.1 to 5.0 parts by mass of an isocyanate-based crosslinking agent with respect to 100 parts by mass of a (meth) acrylic adhesive resin composition. 0.1 to 5.0 parts by mass, and the near-infrared absorbing pigment further includes 0.5 to 3.0 parts by mass with respect to 100 parts by mass of the (meth) acrylic resin. When an adhesive layer is formed from this near-infrared absorbing adhesive, it can exhibit sufficient near-infrared absorbing ability to prevent malfunction of peripheral devices. It is possible to exhibit the ability to shield electromagnetic waves to such an extent that the deterioration of performance is prevented and the human body is not adversely affected.
・ 近赤外線吸収色素がフタロシアニン系色素であることにより、フタロシアニン系色素がジイモニウム系色素やジチオール系色素である場合よりも近赤外線吸収能の劣化を抑制することができ、近赤外線吸収性粘着剤による粘着層は経時劣化の少ない近赤外線吸収性能を発揮することができる。 ・ Because the near-infrared absorbing dye is a phthalocyanine dye, it is possible to suppress the deterioration of the near-infrared absorption ability compared to the case where the phthalocyanine dye is a diimonium dye or a dithiol dye. The pressure-sensitive adhesive layer can exhibit near infrared absorption performance with little deterioration with time.
・ 近赤外線吸収性粘着剤が、さらに光の波長３８０〜７８０ｎｍの領域に極大吸収波長を有する色補正色素を含有することにより、ＰＤＰに搭載された場合に色再現性を向上させることができる。 -When a near-infrared absorptive adhesive further contains the color correction pigment | dye which has maximum absorption wavelength in the area | region of 380-780 nm of light, when mounted in PDP, color reproducibility can be improved.
・ 近赤外線遮蔽フィルムは、前記近赤外線吸収性粘着剤が透明基材の一方の面に施され粘着層が形成されて構成される。この近赤外線遮蔽フィルムによれば、ＰＤＰに容易に近赤外線吸収機能を付与することができ、さらにはリワーク性を向上させることができる。 -A near-infrared shielding film is comprised by the said near-infrared absorptive adhesive being given to one side of a transparent base material, and forming the adhesion layer. According to this near-infrared shielding film, the near-infrared absorbing function can be easily imparted to the PDP, and further, the reworkability can be improved.
以下、実施例及び比較例を挙げて前記実施形態をさらに具体的に説明する。
各例においては、光の波長８３０ｎｍ、８５０ｎｍ及び９５０ｎｍにおける近赤外線の透過率がいずれも１５％以下となるように設計を行った。そして、耐久性能として透過率等及び耐久性、粘着性能として粘着性、腐食性及びリワーク性について、以下に示す方法で測定した。
〔耐久性能〕
（透過率等）
透過率はＵＶ−１６００ＰＣ〔（株）島津製作所製の分光光度計の製品名〕を用いて測定し、可視光線平均透過率Ｙ、透過色度ｘ及び透過色度ｙは、ＳＱ２０００〔日本電色工業（株）製の色差計の製品名〕を用い、「ＪＩＳ Ｚ８７２２」及び「ＪＩＳ Ｚ８７２９」に準拠して測定した。なお、光源はＣ光源、２°視野を用いた。
（耐久性）
耐久性の評価は、実施例及び比較例で得られた近赤外線遮蔽フィルムのセパレートフィルムを剥がしてガラス板に貼着した後、温度８０℃の条件、温度６０℃かつ相対湿度（ＲＨ）９５％の条件下にそれぞれ５００時間放置した後の可視光線平均透過率Ｙ、透過色度ｘ、透過色度ｙ、光の波長８３０ｎｍ、８５０ｎｍ及び９５０ｎｍにおける透過率の変化量を測定して行った。そして、変化量がいずれも１．５％未満の場合には◎、いずれか一つでも１．５％以上３％未満の場合には○、いずれか一つでも３％以上５％未満の場合には△、いずれか一つでも５％以上の場合には×と評価した。
〔粘着性能〕
（粘着性）
粘着性の評価は、実施例及び比較例で得られた近赤外線遮蔽フィルムのセパレートフィルムを剥がしてガラス板及び銅メッシュフィルムに質量２ｋｇの手押しローラーで貼着、前記耐久性の評価と同条件下で同時間静置後、外観を目視にて観察した。そして、剥がれ又は浮きが無かった場合を○、外観を阻害しない程度の剥がれ又は浮きがあった場合を△、外観を阻害する程の剥がれ又は浮きがあった場合を×と評価した。
（腐食性）
腐食性の評価は、実施例及び比較例で得られた近赤外線遮蔽フィルムのセパレートフィルムを剥がして銅メッシュフィルムに質量２ｋｇの手押しローラーで貼着し、前記耐久性の評価と同条件下で同時間静置後、手で剥離して銅メッシュフィルムの腐食の状態を目視にて観察した。そして、腐食が確認されなかった場合を○、面積にして１０％程度に腐食が確認された場合を△、全面に腐食が確認された場合を×と評価した。
（リワーク性）
リワーク性の評価は、実施例及び比較例で得られた近赤外線遮蔽フィルムのセパレートフィルムを剥がしてガラス板及び銅メッシュフィルムに質量２ｋｇの手押しローラーで貼着した後、手で剥離して糊残りの状態を目視にて観察した。そして、糊残りが無かった場合を○、面積にして１０％程度の糊残りがあった場合を△、全面に糊残りがあった場合を×と評価した。
＜近赤外線吸収性粘着剤Ａの作製＞
ｎ−ブチルアクリレート８９．１質量部、アクリル酸９．９質量部、２−ヒドロキシエチルメタクリレート１質量部、アゾビスイソブチロニトリル０．４質量部、酢酸エチル９０質量部及びトルエン６０質量部を混合し、窒素雰囲気下で混合物を６５℃に加温して１０時間重合反応を行い、酸価１５ｍｇＫＯＨ／ｇの（メタ）アクリル系樹脂を調製した。この（メタ）アクリル系樹脂にコロネートＬ〔日本ポリウレタン（株）製のトリレンジイソシアネート（ＴＤＩ）系のポリイソシアネート〕１質量部、固形分が２０質量％となるように酢酸エチルを加えて（メタ）アクリル系粘着樹脂組成物を得た。この（メタ）アクリル系粘着樹脂組成物５００質量部に、ＣＩＲ−ＲＬ〔日本カーリット（株）製のジイモニウム塩化合物〕１．３質量部、ＩＲ−１０Ａ〔（株）日本触媒製のフタロシアニン化合物〕０．７質量部、アデカスタブＡ−６０〔ＡＤＥＫＡ（株）製のヒンダードフェノール系酸化防止剤〕１．０質量部をそれぞれ混合し、近赤外線吸収性粘着剤Ａを得た。
＜近赤外線吸収性粘着剤Ｂの作製＞
近赤外線吸収性粘着剤Ａにおいて、近赤外線吸収色素としてＩＲ−１４〔（株）日本触媒製のフタロシアニン化合物〕０．３質量部、ＴＸＥＸ８２０〔（株）日本触媒製のフタロシアニン化合物〕０．５５質量部、ＴＸＥＸ９１５（(株)日本触媒製フタロシアニン化合物）０．５８質量部、色補正色素としてＴＡＰ−１８（山田化学工業(株)製テトラアザポルフィリン化合物、極大吸収波長５９２ｎｍ）０．１６質量部、ＯＲＡＺＯＬ ＲＥＤ ２Ｂ〔チバ・ジャパン（株）製の色補正色素、極大吸収波長５１５ｎｍ〕０．０４質量部、ＶＡＬＩＦＡＳＴ ＯＲＡＮＧＥ ３２０９〔オリヱント化学工業（株）製の色補正色素、極大吸収波長４９１ｎｍ〕０．０５質量部、ＯＲＡＺＯＬ Ｂｌａｃｋ ＲＬＩ〔チバ・ジャパン（株）製の色補正色素、極大吸収波長５８４ｎｍ〕０．０９質量部をそれぞれ用いた以外は同様にして近赤外線吸収性粘着剤Ｂを得た。
＜近赤外線吸収性粘着剤Ｃの作製＞
近赤外線吸収性粘着剤Ａにおいて、近赤外線吸収色素としてＳＤ１５１―Ｊ１０Ｎ〔住友精化工業（株）製のジチオール含有系化合物〕０．９質量部を用いた以外は同様にして近赤外線吸収性粘着剤Ｃを得た。
＜近赤外線吸収性粘着剤Ｄの作製＞
ｎ−ブチルアクリレート９４．６質量部、アクリル酸４．４質量部、２−ヒドロキシエチルメタクリレート１質量部、アゾビスイソブチロニトリル０．４質量部、酢酸エチル９０質量部及びトルエン６０質量部を混合し、窒素雰囲気下で混合物を６５℃に加温して１０時間重合反応を行い、酸価９ｍｇＫＯＨ／ｇの（メタ）アクリル系樹脂溶液を調製した。この溶液にコロネートＬ〔日本ポリウレタン（株）製のＴＤＩ系のポリイソシアネート〕１質量部を加えて、固形分が２０質量％となるように酢酸エチルを加えて（メタ）アクリル系粘着樹脂組成物を得た。この（メタ）アクリル系粘着樹脂組成物５００質量部に、ＣＩＲ−ＲＬ〔日本カーリット（株）製のジイモニウム塩化合物〕１．３質量部、ＩＲ−１０Ａ〔（株）日本触媒製のフタロシアニン化合物〕０．７質量部、ＴＡＰ−１８〔山田化学工業（株）製のテトラアザポルフィリン化合物、極大吸収波長５９２ｎｍ〕０．１１質量部、ＶＡＬＩＦＡＳＴ ＲＥＤ ３３０４〔オリヱント化学工業（株）製の色補正色素、極大吸収波長５３６ｎｍ〕０．０１質量部、ＯＲＡＺＯＬ Ｂｌａｃｋ ＲＬＩ〔チバ・ジャパン（株）製の色補正色素、極大吸収波長５８４ｎｍ〕０．０７質量部、アデカスタブＡ−６０〔ＡＤＥＫＡ（株）製のヒンダードフェノール系酸化防止剤〕１．０質量部をそれぞれ混合し、近赤外線吸収性粘着剤Ｄを得た。
＜近赤外線吸収性粘着剤Ｅの作製＞
近赤外線吸収性粘着剤Ｄにおいて、近赤外線吸収色素としてＩＲ−１４〔（株）日本触媒製のフタロシアニン化合物〕０．３質量部、ＴＸ−ＥＸ−８２０〔（株）日本触媒製のフタロシアニン化合物〕０．５５質量部及びＴＸ−ＥＸ−９１５〔（株）日本触媒製のフタロシアニン化合物〕０．５８質量部を用いた以外は同様にして近赤外線吸収性粘着剤Ｅを得た。
＜近赤外線吸収性粘着剤Ｆの作製＞
近赤外線吸収性粘着剤Ａにおいて、ｎ−ブチルアクリレートを７９．７質量部、アクリル酸を１９．３質量部に変更して酸価２３ｍｇＫＯＨ／ｇの（メタ）アクリル系樹脂を用いた以外は同様にして近赤外線吸収性粘着剤Ｆを得た。
＜近赤外線吸収性粘着剤Ｇの作製＞
近赤外線吸収性粘着剤Ｆにおいて、酸化防止剤を使用しなかった以外は同様にして近赤外線吸収性粘着剤Ｇを得た。
＜近赤外線吸収性粘着剤Ｈの作製＞
近赤外線吸収性粘着剤Ａにおいて、さらに色補正色素としてＴＡＰ−１８〔山田化学工業（株）製のテトラアザポルフィリン化合物、極大吸収波長５９２ｎｍ〕０．１１質量部、ＶＡＬＩＦＡＳＴ ＲＥＤ ３３０４〔オリヱント化学工業（株）製の色補正色素、極大吸収波長５３６ｎｍ〕０．０１質量部、ＯＲＡＺＯＬ Ｂｌａｃｋ ＲＬＩ〔チバ・ジャパン（株）製の色補正色素、極大吸収波長５８４ｎｍ〕０．０７質量部を用い、かつ酸化防止剤を使用しなかった以外は同様にして近赤外線吸収性粘着剤Ｈを得た。
＜近赤外線吸収性粘着剤Ｉの作製＞
近赤外線吸収性粘着剤Ｂにおいて、色補正色素と酸化防止剤を使用しなかった以外は同様にして近赤外線吸収性粘着剤Ｉを得た。
＜近赤外線吸収性粘着剤Ｊの作製＞
近赤外線吸収性粘着剤Ｄにおいて、粘着剤樹脂としてＳＤ４５７０〔東レ・ダウコーニング・シリコーン（株）製の付加反応型シリコーン粘着剤）１００質量部、硬化剤としてＳＲＸ２１２〔東レ・ダウコーニング・シリコーン（株）製〕０．９質量部を混合したものを用い、かつ酸化防止剤を使用しなかった以外は同様にして近赤外線吸収性粘着剤Ｊを得た。
＜近赤外線吸収性粘着剤Ｋの作製＞
近赤外線吸収性粘着剤Ｊにおいて、色補正色素を使用しなかった以外は同様にして近赤外線吸収性粘着剤Ｋを得た。
＜近赤外線吸収性樹脂Ｌの作製＞
フォレットＧＳ−１０００〔綜研化学（株）製のポリメチルメタクリレート（ＰＭＭＡ）、固形分濃度３０質量％〕、近赤外線吸収色素としてＣＩＲ−ＲＬ〔日本カーリット（株）製のジイモニウム塩化合物〕４．０質量部、ＩＲ−１０Ａ〔（株）日本触媒製のフタロシアニン化合物〕１．７質量部、ＴＡＰ−１８〔山田化学工業（株）製のテトラアザポルフィリン化合物、極大吸収波長５９２ｎｍ〕０．２８質量部、ＯＲＡＺＯＬ Ｏｒａｎｇｅ ＲＧ〔チバ・ジャパン（株）製の色補正色素、極大吸収波長４９１ｎｍ〕０．０６質量部、及びＯＲＡＺＯＬ Ｂｌａｃｋ ＲＬＩ〔チバ・ジャパン（株）製の色補正色素、極大吸収波長５８４ｎｍ〕０．５４質量部をそれぞれ混合し、近赤外線吸収性樹脂Ｌを得た。
（実施例１、近赤外線遮蔽フィルムＡの作製）
近赤外線吸収性粘着剤Ａをセパレートフィルム上に乾燥後の厚みが２５μｍとなるようにオートアプリケーターを用いて塗布し、９０℃で２分間乾燥して粘着層を形成した。得られた粘着層を、透明基材であるリアルック７８００〔日油（株）製のＰＥＴ基材を用いた反射防止（ＡＲ）フィルム〕に貼着し、３０℃で５日間保存することにより近赤外線遮蔽フィルムＡを得た。
（実施例２、近赤外線遮蔽フィルムＢの作製）
近赤外線遮蔽フィルムＡにおいて、近赤外線吸収性粘着剤として近赤外線吸収性粘着剤Ｂを用い、さらには透明基材としてライトナビ７０１０ＵＶ〔日油（株）製のＰＥＴ基材（紫外線吸収剤を含有）を用いたハードコート（ＨＣ）フィルム〕を用いた以外は同様にして近赤外線遮蔽フィルムＢを得た。
（実施例３、近赤外線遮蔽フィルムＣの作製）
近赤外線遮蔽フィルムＡにおいて、近赤外線吸収性粘着剤として近赤外線吸収性粘着剤Ｃを用い、さらには透明基材としてコスモシャインＡ４１００〔東洋紡績（株）製のＰＥＴフィルム〕を用いた以外は同様にして近赤外線遮蔽フィルムＣを得た。
（実施例４及び５、近赤外線遮蔽フィルムＤ及びＥの作製）
近赤外線遮蔽フィルムＡにおいて、近赤外線吸収性粘着剤として近赤外線吸収性粘着剤Ｄ及びＥをそれぞれ用いた以外は同様にして近赤外線遮蔽フィルムＤ及びＥを得た。
（比較例１〜３、近赤外線遮蔽フィルムＦ〜Ｈの作製）
近赤外線遮蔽フィルムＡにおいて、近赤外線吸収性粘着剤として近赤外線吸収性粘着剤Ｆ〜Ｈをそれぞれ用いた以外は同様にして近赤外線遮蔽フィルムＦ〜Ｈを得た。
（比較例４、近赤外線遮蔽フィルムＩの作製）
近赤外線遮蔽フィルムＢにおいて、近赤外線吸収性粘着剤として近赤外線吸収性粘着剤Ｉを用いた以外は同様にして近赤外線遮蔽フィルムＩを得た。
（比較例５及び６、近赤外線遮蔽フィルムＪ及びＫの作製）
近赤外線遮蔽フィルムＡにおいて、近赤外線吸収性粘着剤として近赤外線吸収性粘着剤Ｊ及びＫをそれぞれ用いた以外は同様にして近赤外線遮蔽フィルムＪ及びＫを得た。
（比較例７）
＜近赤外線遮蔽フィルムＬの作製＞
近赤外線吸収性樹脂Ｌをリアルック７８１０ＵＶ〔日油（株）製のＰＥＴ基材（紫外線吸収剤を含有）を用いた反射防止フィルム〕の裏面に乾燥膜厚が１０μｍとなるようにグラビアコーターを用いて塗布し、１５０℃で２分間乾燥することで近赤外線遮蔽フィルムを得た。これに、実施例１で使用した近赤外線吸収性粘着剤Ａの近赤外線吸収色素を添加する前の（メタ）アクリル系粘着樹脂組成物から実施例１と同様にして作製した粘着層を近赤外線吸収層側に貼合して近赤外線遮蔽フィルムＬを得た。
Hereinafter, the embodiment will be described more specifically with reference to examples and comparative examples.
In each example, the design was performed so that the near-infrared transmittance at light wavelengths of 830 nm, 850 nm, and 950 nm was 15% or less. And it measured by the method shown below about the transmittance | permeability etc. and durability as durability performance, and adhesiveness, corrosivity, and rework property as adhesion performance.
[Durability]
(Transmissivity etc.)
The transmittance was measured using UV-1600PC [product name of spectrophotometer manufactured by Shimadzu Corporation], and the visible light average transmittance Y, transmission chromaticity x, and transmission chromaticity y were SQ2000 [Nippon Denshoku Co., Ltd. The product name of a color difference meter manufactured by Kogyo Co., Ltd.] was used in accordance with “JIS Z8722” and “JIS Z8729”. The light source was a C light source and a 2 ° field of view.
(durability)
The durability was evaluated by peeling the separate film of the near-infrared shielding film obtained in Examples and Comparative Examples and attaching the film to a glass plate, then at a temperature of 80 ° C., a temperature of 60 ° C. and a relative humidity (RH) of 95%. The measurement was performed by measuring the visible light average transmittance Y, the transmission chromaticity x, the transmission chromaticity y, and the change in transmittance at light wavelengths of 830 nm, 850 nm, and 950 nm after being allowed to stand for 500 hours. And if the amount of change is less than 1.5%, ◎, if any one is 1.5% or more and less than 3%, ○, if any one is 3% or more and less than 5%. In the case of Δ, any one of them was evaluated as × when 5% or more.
[Adhesion performance]
(Adhesive)
Evaluation of adhesiveness is the same conditions as in the above evaluation of durability, peeling off the separate film of the near-infrared shielding film obtained in Examples and Comparative Examples and sticking to a glass plate and a copper mesh film with a hand-roller having a mass of 2 kg. After standing at the same time, the appearance was visually observed. Then, the case where there was no peeling or lifting was evaluated as ◯, the case where there was peeling or floating that did not hinder the appearance was evaluated as Δ, and the case where there was peeling or floating enough to inhibit the appearance was evaluated as x.
(Corrosive)
The evaluation of corrosiveness is performed by peeling off the separate infrared light shielding film obtained in Examples and Comparative Examples and sticking it to a copper mesh film with a hand-rolling roller having a mass of 2 kg. After standing for a period of time, it was peeled off by hand and the state of corrosion of the copper mesh film was visually observed. Then, the case where corrosion was not confirmed was evaluated as ◯, the case where corrosion was confirmed to about 10% in terms of area was evaluated as Δ, and the case where corrosion was confirmed over the entire surface was evaluated as ×.
(Reworkability)
Evaluation of reworkability is performed by peeling off the separate film of the near-infrared shielding film obtained in Examples and Comparative Examples and sticking it to a glass plate and a copper mesh film with a hand-rolling roller having a mass of 2 kg, and then peeling it off by hand. The state of was observed visually. The case where there was no adhesive residue was evaluated as ◯, the case where there was about 10% adhesive residue in the area, Δ, and the case where there was adhesive residue on the entire surface was evaluated as ×.
<Preparation of near-infrared absorbing adhesive A>
89.1 parts by mass of n-butyl acrylate, 9.9 parts by mass of acrylic acid, 1 part by mass of 2-hydroxyethyl methacrylate, 0.4 parts by mass of azobisisobutyronitrile, 90 parts by mass of ethyl acetate and 60 parts by mass of toluene The mixture was heated to 65 ° C. under a nitrogen atmosphere and subjected to a polymerization reaction for 10 hours to prepare a (meth) acrylic resin having an acid value of 15 mgKOH / g. To this (meth) acrylic resin, 1 part by weight of coronate L [polyisocyanate of tolylene diisocyanate (TDI) manufactured by Nippon Polyurethane Co., Ltd.] was added ethyl acetate so that the solid content was 20% by weight (meta ) An acrylic adhesive resin composition was obtained. To 500 parts by weight of this (meth) acrylic adhesive resin composition, 1.3 parts by weight of CIR-RL [a diimonium salt compound manufactured by Nippon Carlit Co., Ltd.], IR-10A [a phthalocyanine compound manufactured by Nippon Shokubai Co., Ltd.] 0.7 parts by mass and 1.0 part by mass of ADEKA STAB A-60 [hindered phenol antioxidant manufactured by ADEKA Co., Ltd.] were mixed to obtain a near-infrared absorbing adhesive A.
<Preparation of near-infrared absorbing adhesive B>
In the near-infrared absorbing adhesive A, as a near-infrared absorbing dye, IR-14 [phthalocyanine compound manufactured by Nippon Shokubai Co., Ltd.] 0.3 parts by mass, TXEX820 [phthalocyanine compound manufactured by Nippon Shokubai Co., Ltd.] 0.55 mass Parts, TXEX915 (Nippon Catalysts phthalocyanine compound) 0.58 parts by mass, TAP-18 (Yamada Chemical Industries, Ltd. tetraazaporphyrin compound, maximum absorption wavelength 592 nm) 0.16 parts by mass, ORAZOL RED 2B [color correction dye manufactured by Ciba Japan Co., Ltd., maximum absorption wavelength 515 nm] 0.04 parts by mass, VALIFAST ORANGE 3209 [color correction dye manufactured by Orient Chemical Industries, Ltd., maximum absorption wavelength 491 nm] 05 parts by mass, ORAZOL Black RLI [Ciba Japan Co., Ltd. color correction dye, pole Large absorption wavelength 584 nm] A near-infrared absorbing adhesive B was obtained in the same manner except that 0.09 parts by mass were used.
<Preparation of near-infrared absorbing adhesive C>
In the near-infrared absorbing pressure-sensitive adhesive A, a near-infrared-absorbing pressure-sensitive adhesive was similarly used except that 0.9 part by mass of SD151-J10N (a dithiol-containing compound manufactured by Sumitomo Seika Kogyo Co., Ltd.) was used as the near-infrared absorbing dye. Agent C was obtained.
<Preparation of near-infrared absorbing adhesive D>
94.6 parts by mass of n-butyl acrylate, 4.4 parts by mass of acrylic acid, 1 part by mass of 2-hydroxyethyl methacrylate, 0.4 parts by mass of azobisisobutyronitrile, 90 parts by mass of ethyl acetate and 60 parts by mass of toluene The mixture was heated to 65 ° C. in a nitrogen atmosphere and subjected to a polymerization reaction for 10 hours to prepare a (meth) acrylic resin solution having an acid value of 9 mgKOH / g. To this solution, 1 part by weight of Coronate L [manufactured by Nippon Polyurethane Co., Ltd., TDI-based polyisocyanate] is added, and ethyl acetate is added so that the solid content is 20% by weight. A (meth) acrylic adhesive resin composition Got. To 500 parts by weight of this (meth) acrylic adhesive resin composition, 1.3 parts by weight of CIR-RL [a diimonium salt compound manufactured by Nippon Carlit Co., Ltd.], IR-10A [a phthalocyanine compound manufactured by Nippon Shokubai Co., Ltd.] 0.7 parts by mass, TAP-18 [tetraazaporphyrin compound manufactured by Yamada Chemical Co., Ltd., maximum absorption wavelength 592 nm] 0.11 part by mass, VALIFAST RED 3304 [color correction dye manufactured by Orient Chemical Co., Ltd.] Maximum absorption wavelength 536 nm] 0.01 part by mass, color correction dye manufactured by ORAZOL Black RLI [Ciba Japan Co., Ltd., maximum absorption wavelength 584 nm] 0.07 part by mass, Adeka Stub A-60 [manufactured by ADEKA Co., Ltd.] Dophenol-based antioxidant] 1.0 part by mass was mixed to obtain a near-infrared absorbing adhesive D.
<Preparation of near-infrared absorbing adhesive E>
In the near-infrared absorbing adhesive D, as a near-infrared absorbing dye, IR-14 [phthalocyanine compound manufactured by Nippon Shokubai Co., Ltd.] 0.3 parts by mass, TX-EX-820 [phthalocyanine compound manufactured by Nippon Shokubai Co., Ltd.] Near-infrared absorbing pressure-sensitive adhesive E was obtained in the same manner except that 0.55 parts by mass and TX-EX-915 [Nippon Shokubai Co., Ltd. phthalocyanine compound] 0.58 parts by mass were used.
<Preparation of near-infrared absorbing adhesive F>
In the near-infrared absorbing adhesive A, except that n-butyl acrylate was changed to 79.7 parts by mass and acrylic acid was changed to 19.3 parts by mass, and a (meth) acrylic resin having an acid value of 23 mgKOH / g was used. Thus, a near-infrared absorbing adhesive F was obtained.
<Preparation of near-infrared absorbing adhesive G>
In the near infrared absorbing adhesive F, a near infrared absorbing adhesive G was obtained in the same manner except that the antioxidant was not used.
<Preparation of near-infrared absorbing adhesive H>
In the near-infrared absorptive adhesive A, TAP-18 [Yamada Chemical Industries, Ltd. tetraazaporphyrin compound, maximum absorption wavelength 592 nm] 0.11 parts by mass, VALIFAST RED 3304 [Oriento Chemical Industry ( Co., Ltd. color correction dye, maximum absorption wavelength 536 nm] 0.01 parts by mass, ORAZOL Black RLI [Ciba Japan Co., Ltd. color correction dye, maximum absorption wavelength 584 nm] 0.07 parts by mass, and oxidation A near-infrared absorbing pressure-sensitive adhesive H was obtained in the same manner except that the inhibitor was not used.
<Preparation of near-infrared absorbing adhesive I>
In the near-infrared absorbing adhesive B, a near-infrared absorbing adhesive I was obtained in the same manner except that the color correction dye and the antioxidant were not used.
<Preparation of near-infrared absorbing adhesive J>
In near-infrared absorbing adhesive D, 100 parts by mass of SD4570 (addition reaction type silicone adhesive made by Toray Dow Corning Silicone) as an adhesive resin, and SRX212 [Toray Dow Corning Silicone, Inc. as a curing agent )] A near-infrared absorbing pressure-sensitive adhesive J was obtained in the same manner except that 0.9 parts by mass was used and no antioxidant was used.
<Preparation of near-infrared absorbing adhesive K>
In the near-infrared absorbing adhesive J, a near-infrared absorbing adhesive K was obtained in the same manner except that no color correction dye was used.
<Preparation of near-infrared absorbing resin L>
Foret GS-1000 [Polymethylmethacrylate (PMMA) manufactured by Soken Chemical Co., Ltd., solid content concentration 30 mass%], CIR-RL [Diimonium salt compound manufactured by Nippon Carlit Co., Ltd.] 4.0 as a near infrared absorbing dye Part by mass, IR-10A [Phthalocyanine compound manufactured by Nippon Shokubai Co., Ltd.] 1.7 parts by mass, TAP-18 [tetraazaporphyrin compound manufactured by Yamada Chemical Co., Ltd., maximum absorption wavelength 592 nm] 0.28 parts by mass , ORAZOL Orange RG [color correction dye manufactured by Ciba Japan Co., Ltd., maximum absorption wavelength 491 nm] 0.06 parts by mass, and ORAZOL Black RLI [color correction dye manufactured by Ciba Japan Co., Ltd., maximum absorption wavelength 584 nm] 0.54 mass parts was mixed, respectively, and the near-infrared absorptive resin L was obtained.
(Example 1, production of near-infrared shielding film A)
The near-infrared absorbing adhesive A was applied onto a separate film using an auto applicator so that the thickness after drying was 25 μm, and dried at 90 ° C. for 2 minutes to form an adhesive layer. By sticking the obtained adhesive layer to Realic 7800 which is a transparent substrate (Antireflection (AR) film using a PET substrate manufactured by NOF Corporation) and storing it at 30 ° C. for 5 days, An infrared shielding film A was obtained.
(Example 2, production of near-infrared shielding film B)
In the near-infrared shielding film A, the near-infrared-absorbing adhesive B is used as the near-infrared-absorbing adhesive, and further, Light Navi 7010UV [PET base material manufactured by NOF Corporation (containing an ultraviolet absorber) is used as the transparent base material. A near-infrared shielding film B was obtained in the same manner except that a hard coat (HC) film] was used.
(Example 3, production of near-infrared shielding film C)
In the near-infrared shielding film A, the same except that near-infrared absorbing adhesive C was used as the near-infrared absorbing adhesive, and Cosmo Shine A4100 [PET film manufactured by Toyobo Co., Ltd.] was used as the transparent substrate. Thus, a near infrared shielding film C was obtained.
(Examples 4 and 5, production of near-infrared shielding films D and E)
In the near-infrared shielding film A, near-infrared shielding films D and E were obtained in the same manner except that near-infrared absorbing adhesives D and E were used as near-infrared absorbing adhesives, respectively.
(Comparative Examples 1-3, production of near-infrared shielding films FH)
In the near-infrared shielding film A, near-infrared shielding films F to H were obtained in the same manner except that near-infrared absorbing adhesives F to H were used as near-infrared absorbing adhesives, respectively.
(Comparative example 4, production of near-infrared shielding film I)
In the near-infrared shielding film B, a near-infrared shielding film I was obtained in the same manner except that the near-infrared absorbing adhesive I was used as the near-infrared absorbing adhesive.
(Comparative Examples 5 and 6, production of near-infrared shielding films J and K)
In the near-infrared shielding film A, near-infrared shielding films J and K were obtained in the same manner except that near-infrared absorbing adhesives J and K were used as near-infrared absorbing adhesives, respectively.
(Comparative Example 7)
<Preparation of near-infrared shielding film L>
A gravure coater is used on the back surface of the near-infrared absorbing resin L such that the dry film thickness is 10 μm on the back surface of Realic 7810 UV [Antireflection film using PET base material (containing ultraviolet absorber) manufactured by NOF Corporation]. And a near-infrared shielding film was obtained by drying at 150 ° C. for 2 minutes. The adhesive layer produced in the same manner as in Example 1 from the (meth) acrylic adhesive resin composition before the addition of the near-infrared absorbing dye of the near-infrared absorbing adhesive A used in Example 1 was used as the near-infrared ray. The near-infrared shielding film L was obtained by bonding to the absorption layer side.
以上のようにして得られた近赤外線遮蔽フィルムＡ〜Ｌについて、耐久性、粘着性、腐食性及びリワーク性を前述の方法にて測定し、それらの評価結果を表１に示した。なお、表１において、酸価の単位はｍｇＫＯＨ／ｇ、含有量は質量部を表す。 The near-infrared shielding films A to L obtained as described above were measured for durability, tackiness, corrosiveness, and reworkability by the methods described above, and the evaluation results are shown in Table 1. In Table 1, the unit of the acid value is mg KOH / g, and the content is part by mass.
なお、実施例１〜５においては、銅メッシュフィルムに対する腐食性の評価がいずれも良好であったため、銅メッシュフィルムに基づく電磁波遮蔽能が維持されることは明らかである。 In Examples 1 to 5, since the corrosiveness evaluation to the copper mesh film was good, it is clear that the electromagnetic wave shielding ability based on the copper mesh film is maintained.
その一方、比較例１〜６の近赤外線遮蔽フィルムＦ〜Ｋは、本発明で規定する要件を満たしていないため、耐久性と粘着性の少なくとも一方に問題のある結果であった。また、比較例５及び６の近赤外線遮蔽フィルムＪ及びＫは、銅メッシュに対する粘着力が十分ではなく、腐食性を評価することはできなかった。さらに、比較例７の近赤外線遮蔽フィルムＬは、近赤外線吸収層と粘着層との界面で剥離が生じてしまい、リワーク性に欠ける結果となった。 On the other hand, since the near-infrared shielding films F to K of Comparative Examples 1 to 6 did not satisfy the requirements defined in the present invention, the results were problematic in at least one of durability and adhesiveness. Moreover, the near-infrared shielding films J and K of Comparative Examples 5 and 6 did not have sufficient adhesion to the copper mesh, and could not be evaluated for corrosivity. Furthermore, the near-infrared shielding film L of Comparative Example 7 was peeled off at the interface between the near-infrared absorbing layer and the adhesive layer, resulting in lack of reworkability.
なお、前記実施形態を次のように変更して実施することも可能である。
・ 酸価の異なる（メタ）アクリル系樹脂を複数調製し、それらの（メタ）アクリル系樹脂を適宜組合せて酸価が２０ｍｇＫＯＨ／ｇ以下の所定値となるように実施することもできる。
It should be noted that the above embodiment can be modified as follows.
A plurality of (meth) acrylic resins having different acid values can be prepared, and the (meth) acrylic resins can be combined as appropriate so that the acid value becomes a predetermined value of 20 mgKOH / g or less.
・ 近赤外線吸収色素として、実施例１〜５以外に、ジイモニウム系色素単独、ジイモニウム系色素とジチオール系色素の混合物、フタロシアニン系色素とジチオール系色素の混合物、ジイモニウム系色素とフタロシアニン系色素とジチオール系色素の混合物を用いることもできる。 In addition to Examples 1 to 5, as a near-infrared absorbing dye, a diimonium dye alone, a mixture of a diimonium dye and a dithiol dye, a mixture of a phthalocyanine dye and a dithiol dye, a diimonium dye, a phthalocyanine dye and a dithiol dye Mixtures of dyes can also be used.
さらに、前記実施形態より把握される技術的思想について以下に記載する。
〇 前記近赤外線吸収色素がフタロシアニン系色素のみで構成されていることを特徴とする請求項３又は請求項４に記載の近赤外線吸収性粘着剤。このように構成した場合、請求項３又は請求項４に係る発明の効果に加えて、近赤外線吸収色素の耐久性能を向上させることができる。
Furthermore, the technical idea grasped from the embodiment will be described below.
The near-infrared absorbing adhesive according to claim 3 or 4, wherein the near-infrared absorbing dye is composed of only a phthalocyanine dye. When comprised in this way, in addition to the effect of the invention which concerns on Claim 3 or Claim 4, the durability performance of a near-infrared absorption pigment | dye can be improved.
Claims (5)
前記（メタ）アクリル系粘着樹脂組成物は酸価が２０ｍｇＫＯＨ／ｇ以下の（メタ）アクリル系樹脂と、イソシアネート系架橋剤と、酸化防止剤とを含み、前記近赤外線吸収色素はジイモニウム系色素、フタロシアニン系色素及びジチオール系色素の中から選ばれる1種以上であることを特徴とする近赤外線吸収性粘着剤。 A near-infrared absorbing adhesive containing a (meth) acrylic adhesive resin composition and a near-infrared absorbing dye,
The (meth) acrylic adhesive resin composition includes a (meth) acrylic resin having an acid value of 20 mgKOH / g or less, an isocyanate crosslinking agent, and an antioxidant, and the near-infrared absorbing dye is a diimonium dye, A near-infrared absorbing adhesive, characterized in that it is at least one selected from phthalocyanine dyes and dithiol dyes.
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