JP6383967B2 - Protective member for information display screen - Google Patents
Protective member for information display screen Download PDFInfo
- Publication number
- JP6383967B2 JP6383967B2 JP2014115354A JP2014115354A JP6383967B2 JP 6383967 B2 JP6383967 B2 JP 6383967B2 JP 2014115354 A JP2014115354 A JP 2014115354A JP 2014115354 A JP2014115354 A JP 2014115354A JP 6383967 B2 JP6383967 B2 JP 6383967B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- sensitive adhesive
- film
- protective member
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
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- 230000001681 protective effect Effects 0.000 title claims description 86
- 239000010410 layer Substances 0.000 claims description 148
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 75
- 238000001179 sorption measurement Methods 0.000 claims description 64
- 238000003860 storage Methods 0.000 claims description 30
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 25
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- 239000011521 glass Substances 0.000 claims description 21
- 229920005989 resin Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- 238000010030 laminating Methods 0.000 claims description 10
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- 238000002834 transmittance Methods 0.000 claims description 8
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- 239000003463 adsorbent Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 description 60
- -1 ITO Chemical class 0.000 description 27
- 238000000034 method Methods 0.000 description 22
- 239000012790 adhesive layer Substances 0.000 description 20
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- 239000013039 cover film Substances 0.000 description 15
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- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 13
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
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- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
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- 239000004593 Epoxy Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000003522 acrylic cement Substances 0.000 description 2
- 229920006243 acrylic copolymer Polymers 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
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- 238000010008 shearing Methods 0.000 description 2
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- 239000005361 soda-lime glass Substances 0.000 description 2
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- 239000013638 trimer Substances 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- OHLKMGYGBHFODF-UHFFFAOYSA-N 1,4-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=C(CN=C=O)C=C1 OHLKMGYGBHFODF-UHFFFAOYSA-N 0.000 description 1
- DKBHJZFJCDOGOY-UHFFFAOYSA-N 1,4-diisocyanato-2-methylbenzene Chemical compound CC1=CC(N=C=O)=CC=C1N=C=O DKBHJZFJCDOGOY-UHFFFAOYSA-N 0.000 description 1
- FWWWRCRHNMOYQY-UHFFFAOYSA-N 1,5-diisocyanato-2,4-dimethylbenzene Chemical compound CC1=CC(C)=C(N=C=O)C=C1N=C=O FWWWRCRHNMOYQY-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
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- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 description 1
- WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical group CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- DXPPIEDUBFUSEZ-UHFFFAOYSA-N 6-methylheptyl prop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C=C DXPPIEDUBFUSEZ-UHFFFAOYSA-N 0.000 description 1
- CUXGDKOCSSIRKK-UHFFFAOYSA-N 7-methyloctyl prop-2-enoate Chemical compound CC(C)CCCCCCOC(=O)C=C CUXGDKOCSSIRKK-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
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- 239000004971 Cross linker Substances 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
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- KORSJDCBLAPZEQ-UHFFFAOYSA-N dicyclohexylmethane-4,4'-diisocyanate Chemical compound C1CC(N=C=O)CCC1CC1CCC(N=C=O)CC1 KORSJDCBLAPZEQ-UHFFFAOYSA-N 0.000 description 1
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Images
Landscapes
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Laminated Bodies (AREA)
Description
本発明は、ディスプレイパネルの情報表示画面等の被着体に、貼り付けたり、取り外しが可能な情報表示画面用の保護部材に関するもので、より詳細には、各種電子・電気機器の表示装置として使用される液晶ディスプレイ、プラズマディスプレイ、有機ＥＬ等の情報表示画面の保護及び視認性の向上を目的として、この情報表示画面に、ガラスまたは樹脂板からなる硬質の透明保護カバー上に、粘着剤層、基材フィルム、吸着層及びセパレータを順次積層した積層体からなる情報表示画面用の保護部材に関する。 The present invention relates to a protective member for an information display screen that can be attached to or detached from an adherend such as an information display screen of a display panel, and more specifically, as a display device for various electronic and electrical devices. For the purpose of protecting and improving the visibility of information display screens such as liquid crystal displays, plasma displays, and organic EL used, an adhesive layer is formed on the information display screen on a hard transparent protective cover made of glass or a resin plate. The present invention relates to a protective member for an information display screen comprising a laminate in which a base film, an adsorption layer and a separator are sequentially laminated.
例えば、液晶等の表示画面の視認性向上を目的として、セパレータ、粘着剤層、基材シート、シリコーンゲル層、セパレータの順に積層されているシリコーンゲル粘着シートを液晶表示装置の液晶セルの周辺部と拡散板の周辺部及び／又は押え枠との間に挟み込む方法が知られている。（特許文献１）。前記のシリコーンゲル粘着シートの粘着剤層と、ガラスやアクリル等の硬質板である従来の透明部材を貼り合わせて積層した表面保護部材においては、ディスプレイパネルの情報表示画面に貼り付ける際に、前記シリコーンゲル層表面の凹凸に沿って、貼着面に気泡を巻き込み易かった。 For example, for the purpose of improving the visibility of a display screen such as a liquid crystal, a silicone gel pressure-sensitive adhesive sheet laminated in the order of a separator, a pressure-sensitive adhesive layer, a base sheet, a silicone gel layer, and a separator is used as a peripheral part of a liquid crystal cell of a liquid crystal display device. There is known a method of sandwiching between a peripheral portion of a diffusion plate and / or a holding frame. (Patent Document 1). In the surface protective member laminated by laminating the pressure-sensitive adhesive layer of the silicone gel pressure-sensitive adhesive sheet and a conventional transparent member that is a hard plate such as glass or acrylic, when pasting on the information display screen of the display panel, Air bubbles were easily entangled in the sticking surface along the unevenness of the surface of the silicone gel layer.
また、液晶等の表示画面の保護及び視認性向上を目的として、透明ゲルを介して透明部材をディスプレイパネルの情報表示画面に密着させる方法が知られている。（特許文献１）。前記の方法によると、ディスプレイパネルのガラス基板と、ガラスやアクリル等の硬質板である従来の透明部材の接合では、ガラス基板と硬質板の透明部材が面接触して貼り合わされるため、貼り合わせ時に気泡を巻き込み易いだけでなく、一旦貼り合わせてしまうと巻き込んだ気泡を逃がすことが難しかった。気泡を巻き込んだ場合、前記気泡によりディスプレイの輝度、明るさ、色が不均一となり表示むらが発生するため、貼り直しや気泡の押し出しなどの作業が必要になる。巻き込んだ気泡を押し出すために、透明部材の表面から気泡を指で強く押し出したり、貼り直しを繰り返すうちにディスプレイ表面の外観を損なうことがあった。 In addition, for the purpose of protecting the display screen of liquid crystal or the like and improving the visibility, a method of bringing a transparent member into close contact with the information display screen of the display panel through a transparent gel is known. (Patent Document 1). According to the above method, the glass substrate of the display panel and the conventional transparent member that is a hard plate such as glass or acrylic are bonded together because the glass substrate and the transparent member of the hard plate are bonded in surface contact. Not only was it easy to entrain bubbles, but once they were pasted together, it was difficult to escape the entrained bubbles. When bubbles are entrained, the brightness, brightness, and color of the display become nonuniform due to the bubbles and display unevenness occurs. Therefore, operations such as re-sticking and extruding bubbles are required. In order to extrude the entrained bubbles, the appearance of the display surface may be impaired while the bubbles are strongly pushed out from the surface of the transparent member with a finger or repeatedly applied.
また、上記の気泡の巻き込みを抑制する手段として、表示体を成す被着面上に、アクリル系又はウレタン系樹脂を主成分としてなる応力緩和層を配置し、前記応力緩和層の片面に親水性液状層を介してガラス又は樹脂板から成る透明保護体を前記被着面に対して貼着する表示装置の保護体が知られている。(特許文献３)。前記の保護体は、表示体を成す被着面上に、前記応力緩和層、親水性液状層及び透明保護体を積層するという工程が必要となる、そのため高価な製造装置が必要となり、工程も複雑なものとなるので、結果として高価なものになってしまう欠点があった。 Further, as a means for suppressing the entrainment of the bubbles, a stress relaxation layer mainly composed of an acrylic or urethane resin is disposed on the adherend surface forming the display body, and hydrophilicity is provided on one side of the stress relaxation layer. There is known a protective body for a display device in which a transparent protective body made of glass or a resin plate is bonded to the adherend surface via a liquid layer. (Patent Document 3). The protective body requires a process of laminating the stress relaxation layer, the hydrophilic liquid layer, and the transparent protective body on the adherend surface that forms the display body. Therefore, an expensive manufacturing apparatus is required, and the process is also performed. Since it becomes complicated, there is a drawback that it becomes expensive as a result.
本発明は、被着体としてのディスプレイパネルの情報表示画面等のガラス基板に、貼り付けたり、取り外しが可能であり、硬質の保護部材を貼着する場合であっても、貼り付け時に気泡の巻き込みが発生しにくく、視認性に優れた、情報表示画面用の保護部材を提供することを目的とする。 The present invention can be attached to or detached from a glass substrate such as an information display screen of a display panel as an adherend, and even when a hard protective member is attached, there is no bubble at the time of attachment. It is an object of the present invention to provide a protective member for an information display screen that hardly causes entrainment and has excellent visibility.
本発明者は、鋭意検討を行った結果、ディスプレイパネルの情報表示画面と、ガラスやアクリル等の硬質板からなる透明保護カバー上に、粘着剤層、基材フィルム、吸着層を順次積層した積層体からなる保護部材を貼着させる場合において、前記粘着剤層及び前記吸着層の貯蔵弾性率をそれぞれに規定した。前記粘着剤層の貯蔵弾性率を前記吸着層の貯蔵弾性率よりも小さくすることによって、前記保護部材において、前記粘着剤層が前記透明保護カバーのガラス表面の凹凸を吸収するとともに、前記粘着剤層が塑性変形して、前記基材フィルムを介して、前記吸着層表面の凹凸を吸収することで、最終的に被着体に貼着させる時の前記吸着層の平滑性を高くさせる作用を有することを見出した。これにより、前記保護部材を用いて、ディスプレイパネルの表示画面に貼着させる場合においても、貼り付け時に気泡の巻き込みを生じにくく、かつ視認性も良好である、情報表示画面用の保護部材を実現できることを見出し、本発明を完成するに至った。 As a result of intensive studies, the inventor has sequentially laminated an adhesive layer, a base film, and an adsorption layer on an information display screen of a display panel and a transparent protective cover made of a hard plate such as glass or acrylic. When sticking the protective member which consists of a body, the storage elastic modulus of the said adhesive layer and the said adsorption layer was each prescribed | regulated. By making the storage elastic modulus of the pressure-sensitive adhesive layer smaller than the storage elastic modulus of the adsorption layer, in the protective member, the pressure-sensitive adhesive layer absorbs irregularities on the glass surface of the transparent protective cover, and the pressure-sensitive adhesive The layer is plastically deformed and absorbs the irregularities on the surface of the adsorption layer through the base film, so that the adsorption layer is finally smoothened when adhered to the adherend. Found to have. This realizes a protective member for an information display screen that is less likely to entrain air bubbles and has good visibility even when pasted to the display screen of the display panel using the protective member. The present inventors have found that this can be done and have completed the present invention.
第１発明は、ディスプレイパネルの情報表示画面に貼着されるための保護部材であって、前記保護部材は、透明保護カバー上に、アクリル系粘着剤層、基材フィルム及びシリコーン系吸着層を順次積層してなり、前記アクリル系粘着剤層の２５℃における貯蔵弾性率（Ａ）が、１．０×１０３〜１．０×１０５Ｐａであり、かつ前記シリコーン系吸着層の２５℃における貯蔵弾性率（Ｂ）が、１．０×１０４〜３．５×１０５Ｐａであり、前記アクリル系粘着剤層の２５℃における貯蔵弾性率（Ａ）と前記シリコーン系吸着層の２５℃における貯蔵弾性率（Ｂ）の比（Ｂ）／（Ａ）が、０．９以上、６０以下であることを特徴とする保護部材である。
1st invention is a protective member for affixing on the information display screen of a display panel, Comprising: The said protective member has an acrylic adhesive layer, a base film, and a silicone type adsorption layer on a transparent protective cover. The acrylic adhesive layer has a storage elastic modulus (A) at 25 ° C. of 1.0 × 10 3 to 1.0 × 10 5 Pa and 25 ° C. of the silicone-based adsorption layer. in storage modulus (B) is, 1.0 ×
第２発明は、前記アクリル系粘着剤層の厚みが、１０〜１００μｍであることを特徴とする第１発明に記載の保護部材である。 A second invention is the protective member according to the first invention , wherein the acrylic pressure - sensitive adhesive layer has a thickness of 10 to 100 μm.
第３発明は、前記シリコーン系吸着層の厚みが１０〜５０μｍであることを特徴とする、第１発明または第２発明に記載の保護部材である。 A third invention is the protective member according to the first invention or the second invention, wherein the silicone-based adsorption layer has a thickness of 10 to 50 μm.
第４発明は、前記透明保護カバーが、厚さ１００〜１，０００μｍ、光透過率８０％以上であり、かつ、ポリエステル系樹脂、アクリル系樹脂、ポリカーボネート系樹脂から選ばれる硬質樹脂板又はガラス板であることを特徴とする、第１発明〜第３発明のいずれかに記載の保護部材である。 According to a fourth aspect of the present invention, the transparent protective cover has a thickness of 100 to 1,000 μm, a light transmittance of 80% or more, and is a hard resin plate or glass plate selected from a polyester resin, an acrylic resin, and a polycarbonate resin. The protective member according to any one of the first to third inventions.
本発明の保護部材は、透明保護カバー上に、粘着剤層、基材フィルム及び吸着層を順次積層してなり、前記粘着剤層及び前記吸着層の貯蔵弾性率をそれぞれ規定した。前記粘着剤層の貯蔵弾性率を規定し、かつ前記吸着層の貯蔵弾性率よりも小さい値にすることによって、前記透明保護カバーのガラス表面の凹凸を吸収し、かつ前記粘着剤層が塑性変形し、前記基材フィルムを介して前記吸着層表面の凹凸を吸収することで、最終的に被着体に貼着させる時の前記吸着層表面の平滑性を高くさせる作用を有する。それによって、ディスプレイパネルの情報表示画面に前記保護部材を貼着させる際、面接触して貼着させる条件でありながら、貼着界面において空気を逃がしながら貼着することが容易となり、貼り付け時に気泡の巻き込みを生じにくくするものである。 The protective member of the present invention is formed by sequentially laminating a pressure-sensitive adhesive layer, a base film, and an adsorption layer on a transparent protective cover, and the storage elastic modulus of the pressure-sensitive adhesive layer and the adsorption layer is defined respectively. By defining the storage elastic modulus of the pressure-sensitive adhesive layer and making the value smaller than the storage elastic modulus of the adsorption layer, it absorbs irregularities on the glass surface of the transparent protective cover, and the pressure-sensitive adhesive layer is plastically deformed. And it has the effect | action which raises the smoothness of the said adsorption layer surface at the time of sticking to a to-be-adhered body by absorbing the unevenness | corrugation of the said adsorption layer surface through the said base film. As a result, when the protective member is stuck on the information display screen of the display panel, it is easy to stick while releasing air at the sticking interface while sticking in contact with the surface. This makes it difficult for air bubbles to be involved.
以下に本発明の両面粘着フィルム及びそれを用いた情報表示画面用の保護部材を、その構成要素に基づいて、さらに詳しく説明する。 Below, the double-sided pressure-sensitive adhesive film of the present invention and the protective member for an information display screen using the same will be described in more detail based on the components.
（全体構成）
本発明の情報表示画面用の保護部材は、透明保護カバー上に、粘着剤層、基材フィルム及び吸着層を順次積層してなり、セパレータを前記吸着層に貼り合わせた状態、あるいは前記透明保護カバーと、基材フィルムの一方の面に、吸着層を積層し、もう一方の面に粘着剤層を積層してなり、前記吸着層に貼り合わされたセパレータからなる両面粘着フィルムとを、前記粘着剤層を介して貼着した状態で提供されるものである。
(overall structure)
The protective member for the information display screen of the present invention is formed by sequentially laminating an adhesive layer, a base film and an adsorption layer on a transparent protective cover, and a state in which a separator is bonded to the adsorption layer, or the transparent protection. A cover and a double-sided pressure-sensitive adhesive film comprising a separator laminated on the adsorption layer, wherein the adsorption layer is laminated on one surface of the base film and the pressure-sensitive adhesive layer is laminated on the other surface, It is provided in a state in which it is stuck through an agent layer.
（透明保護カバー）
本発明の情報表示画面用の保護部材の構成部材のうち、前記透明保護カバーは、ポリエステル系樹脂、アクリル系樹脂、ポリカーボネート系樹脂から選ばれる硬質樹脂板又はガラス板を用いることが出来る。
(Transparent protective cover)
Among the constituent members of the protective member for the information display screen of the present invention, the transparent protective cover may be a hard resin plate or a glass plate selected from a polyester resin, an acrylic resin, and a polycarbonate resin.
前記透明保護カバーとしては、情報表示画面の表面部材であるガラス基板の屈折率に近い屈折率を有するものを選択することが好ましく、より好ましくは屈折率が１．２〜１．６のものを使用することが好ましい。屈折率の近い材料同士を密着させることによって、界面での反射光を低減させることができるからである。 As the transparent protective cover, it is preferable to select one having a refractive index close to the refractive index of the glass substrate that is the surface member of the information display screen, more preferably one having a refractive index of 1.2 to 1.6. It is preferable to use it. This is because the light reflected at the interface can be reduced by bringing materials having similar refractive indexes into close contact with each other.
また前記透明保護カバーとしては、波長が３８０〜７８０ｎｍの領域の可視光の全光線透過率が８０％以上のものを使用することが好ましい。透過率が８０％未満の場合には、画面から発せられた光が透明部材を透過しにくくなるので、視認性が低下するからである。 The transparent protective cover preferably has a visible light total light transmittance of 80% or more in a wavelength range of 380 to 780 nm. This is because, when the transmittance is less than 80%, the light emitted from the screen is difficult to transmit through the transparent member, so that the visibility is lowered.
（全光線透過率の測定方法）
ここでの全光線透過率は、ＪＩＳ−Ｋ７１０５に準じ、積分球式濁度計(日本電色工業株式会社製、ＮＤＨ２０００)により測定した。
(Measurement method of total light transmittance)
The total light transmittance here was measured with an integrating sphere turbidimeter (NDH2000, manufactured by Nippon Denshoku Industries Co., Ltd.) according to JIS-K7105.
前記透明保護カバーの厚みは、硬さと断裁加工性の観点から１００〜１，０００μｍの範囲であることが好ましい。前記透明保護カバーの厚みが１００μｍより小さいと、前記透明保護カバーを情報表示画面に貼着する際の作業性が低下する場合がある。一方、前記透明保護カバーの厚みが１，０００μｍを超えると、コストアップとなり、透過率が低下して視認性が低下する場合がある。 The thickness of the transparent protective cover is preferably in the range of 100 to 1,000 μm from the viewpoint of hardness and cutting processability. When the thickness of the transparent protective cover is smaller than 100 μm, workability when the transparent protective cover is stuck on the information display screen may be deteriorated. On the other hand, when the thickness of the transparent protective cover exceeds 1,000 μm, the cost increases, and the transmittance may decrease and the visibility may decrease.
前記透明保護カバーは、さらに表面粗さが中心線表面粗さＲａで５．０μｍ以下であることが好ましい。中心線表面粗さＲａが５．０μｍより大きいと、前記透明保護カバーを情報表示画面に貼着させる際に、気泡の巻き込みが生じやすくなるからである。 The transparent protective cover preferably further has a surface roughness of 5.0 μm or less in terms of centerline surface roughness Ra. This is because when the center line surface roughness Ra is larger than 5.0 μm, bubbles are likely to be involved when the transparent protective cover is attached to the information display screen.
前記透明保護カバーには、場合により、光反射防止層を設けることができ、透明保護カバーの片面に光反射防止剤としてＩＴＯ、ＳｉＯ２、ＴｉＯ２、ＺｎＯ２等の酸化金属の膜を形成する。このような膜の形成は、例えばＩＴＯなどをスパッタリングすることにより行っても良く、この方法によって光反射防止層を形成する場合には、透明性など信頼性が高いものが得られる。 In some cases, the transparent protective cover may be provided with a light reflection preventing layer, and a film of a metal oxide such as ITO, SiO 2 , TiO 2 , ZnO 2 or the like is formed on one side of the transparent protective cover as a light reflection preventing agent. . Such a film may be formed, for example, by sputtering ITO or the like. When the light reflection preventing layer is formed by this method, a highly reliable material such as transparency can be obtained.
また、光反射防止層の形成は、コストの点で好ましい方法として、例えばＩＴＯ、ＳｉＯ２、ＴｉＯ２、ＺｎＯ２等の酸化金属の微粉末にアクリル系又はアクリル系樹脂のバインダーを加え溶液化又はエマルジョン化し、これをグラビアコーター、スピンコーターなどで塗布するウエット法で形成しても良い。ウエット法における反射防止剤として使用する前記酸化金属の微粉末の粒径は、透視性の点から微細である程好ましく、１０〜５００ｎｍとすることが好ましいが、この粒径とする場合には、分散性の悪さと二次凝集によって歩留まりが悪くなることから、粒径１．０μｍまでのものが好ましい。 In addition, the formation of the light reflection preventing layer is preferably performed in terms of cost. For example, an acrylic or acrylic resin binder is added to a fine powder of metal oxide such as ITO, SiO 2 , TiO 2 , or ZnO 2 to form a solution or It may be formed by a wet method in which it is emulsified and applied with a gravure coater, spin coater or the like. The particle diameter of the metal oxide fine powder used as an antireflection agent in the wet method is preferably as fine as possible from the viewpoint of transparency, and is preferably 10 to 500 nm. Since the yield deteriorates due to poor dispersibility and secondary aggregation, those having a particle size of up to 1.0 μm are preferable.
（両面粘着フィルム）
本発明の情報表示画面用の保護部材に用いる両面粘着フィルムは、基材フィルムの一方の面に吸着層を積層し、もう一方の面に粘着剤層を積層してなり、前記吸着層にセパレータを貼り合わせ、さらに前記粘着剤層にカバーフィルムを貼り合わせた状態で提供されるものである。
(Double-sided adhesive film)
The double-sided pressure-sensitive adhesive film used for the protective member for the information display screen of the present invention is formed by laminating an adsorbing layer on one side of a base film and laminating an adhesive layer on the other side. And a cover film on the pressure-sensitive adhesive layer.
（基材フィルム）
本発明で使用する基材フィルムは、各種のプラスチックからなるフィルムであれば、特に限定されない。例えばポリオレフィン、ポリエステル、ポリアミド、ポリカーボネート、トリアセチルセルロース、フッ素樹脂、ポリフェニレンオキサイド、ポリイミド、ポリアミドイミド、アクリル系樹脂、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリアクリロニトリル等よりなるフィルムが例示されるが、これらに限定されるものではない。シリコーンゴムの熱架橋時の取り扱い性、コストの面からポリエステルフィルムやポリカーボネートフィルムが好ましい。透明性の点では、ポリエステルフィルム、特にポリエチレンテレフタレートが好ましい。基材の厚みは、用途に応じて適宜選択すればよいが、通常５〜４００μｍ、特に２０〜２５０μｍの範囲であるのが好ましい。
(Base film)
The base film used in the present invention is not particularly limited as long as it is a film made of various plastics. Examples include films made of polyolefin, polyester, polyamide, polycarbonate, triacetyl cellulose, fluororesin, polyphenylene oxide, polyimide, polyamideimide, acrylic resin, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, etc. It is not limited. A polyester film and a polycarbonate film are preferable from the viewpoints of handleability and cost at the time of thermal crosslinking of silicone rubber. From the viewpoint of transparency, a polyester film, particularly polyethylene terephthalate is preferable. The thickness of the substrate may be appropriately selected according to the use, but is usually in the range of 5 to 400 μm, particularly 20 to 250 μm.
基材フィルムは、その表面をコロナ放電処理、紫外線照射処理、プラズマ処理、火炎処理したり、必要に応じてアンカー層等を設けてもよい。アンカー層等を積層する方法としては、製膜時に積層するいわゆるインライン法、または製膜したフィルムに積層するいわゆるオフライン法のいずれでもよい。 The surface of the base film may be subjected to corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, flame treatment, or may be provided with an anchor layer or the like as necessary. As a method for laminating the anchor layer or the like, either a so-called in-line method for laminating at the time of film formation or a so-called off-line method for laminating on the formed film may be used.
（粘着剤層）
本発明の粘着剤層には、アクリル系、ウレタン系、ポリエステル系、シリコーン系、ゴム系等の各種粘着剤を使用することができる。保護部材の全光線透過率が８０％以上になるような高透明粘着剤が得やすい等の理由から、各種アクリルモノマー及び／またはオリゴマーを共重合して得られるアクリル系粘着剤やアクリル系高分子粘着剤（エマルションタイプ）などが好適に使用することができる。
(Adhesive layer)
Various pressure-sensitive adhesives such as acrylic, urethane, polyester, silicone and rubber can be used for the pressure-sensitive adhesive layer of the present invention. Acrylic pressure-sensitive adhesives and acrylic polymers obtained by copolymerizing various acrylic monomers and / or oligomers, for example, because it is easy to obtain a highly transparent pressure-sensitive adhesive having a total light transmittance of 80% or more. An adhesive (emulsion type) or the like can be suitably used.
このアクリル系粘着剤は、例えば、アクリル酸ブチル、アクリル酸−２−エチルヘキシル、アクリル酸イソオクチル、アクリル酸イソノニル、アクリル酸アミル、アクリル酸シクロヘキシル、アクリル酸ベンジルなどのアクリル酸アルキルエステルや、メタクリル酸メチル、メタクリル酸ブチル、メタクリル酸−２−エチルヘキシル、メタクリル酸シクロヘキシル、メタクリル酸ベンジルなどのメタクリル酸アルキルエステルと、これらのアクリル酸アクリルエステル又は、メタクリル酸アルキルエステルに、酢酸ビニル、ビニルエーテル、スチレン、アクリロニトリル、メタクリロニトリルなどのビニル基含有化合物や、アクリル酸、メタクリル酸、イタコン酸、アクリル酸ヒドロキシルエチル、メタクリル酸ヒドロキシルエチル、アクリル酸プロピレングリコール、アクリルアミド、メタクリルアミド、アクリル酸グリシジル、メタクリル酸グリシジル、メタクリル酸ジメチルアミノエチル、メタクリル酸−ｔｅｒｔ−ブチルアミノエチルなど共重合したものが用いられる。 This acrylic pressure-sensitive adhesive is, for example, acrylic acid alkyl ester such as butyl acrylate, 2-ethylhexyl acrylate, isooctyl acrylate, isononyl acrylate, amyl acrylate, cyclohexyl acrylate, benzyl acrylate, or methyl methacrylate. , Methacrylic acid alkyl esters such as butyl methacrylate, methacrylic acid-2-ethylhexyl, cyclohexyl methacrylate, benzyl methacrylate and the acrylic acrylic ester or methacrylic acid alkyl ester, vinyl acetate, vinyl ether, styrene, acrylonitrile, Vinyl group-containing compounds such as methacrylonitrile, acrylic acid, methacrylic acid, itaconic acid, hydroxylethyl acrylate, hydroxylethyl methacrylate, acrylic Propylene glycol, acrylamide, methacrylamide, glycidyl acrylate, glycidyl methacrylate, dimethylaminoethyl methacrylate, those obtained by copolymerizing methacrylic acid -tert- butyl aminoethyl used.
このアクリル系粘着剤に用いられるアクリル共重合体としては、重量平均分子量が１０万〜１００万の範囲内のものが好ましく用いられる。重量平均分子量が１０万より小さいと、粘着力が高くなり、カバーフィルムの剥離が困難になるといった不具合が発生する。また、重量平均分子量が１００万を超えると溶液粘度が高くなり、塗工時に平滑な粘着剤塗工外観が得難い問題がある。また、このアクリル共重合体のガラス転移点（Ｔｇ）は、−２０℃以下のものが好ましく使用できる。−２０℃よりＴｇが高いと粘着剤が硬くなり、透明保護カバーに対して適度な粘着力が得られなくなる。 As the acrylic copolymer used for the acrylic pressure-sensitive adhesive, those having a weight average molecular weight in the range of 100,000 to 1,000,000 are preferably used. If the weight average molecular weight is less than 100,000, the adhesive strength becomes high, and problems such as difficulty in peeling the cover film occur. Moreover, when a weight average molecular weight exceeds 1 million, solution viscosity will become high and there exists a problem that it is difficult to obtain the smooth adhesive coating external appearance at the time of coating. The glass transition point (Tg) of this acrylic copolymer is preferably -20 ° C or lower. When Tg is higher than −20 ° C., the pressure-sensitive adhesive becomes hard, and an appropriate pressure-sensitive adhesive force cannot be obtained for the transparent protective cover.
前記アクリル系粘着剤に用いられる架橋剤としては、イソシアネート系、メラミン系、エポキシ系等、公知の架橋剤を用いることができる。イソシアネート系の架橋剤としては、多価イソシアネートのポリイソシアネート化合物およびこれらポリイソシアネート化合物の３量体、上記ポリイソシアネート化合物とポリオール化合物とを反応させて得られる末端イソシアネートウレタンプレポリマー、これらのポリイソシアネート化合物、これらポリイソシアネート化合物の３量体が挙げられる。多価イソシアネートの具体例としては、２，４−トリレンジイソシアネート、２，５−トリレンジイソシアネート、１，３−キシリレンジイソシアネート、１，４−キシリレンジイソシアネート、ジフェニルメタン−４，４’−ジイソシアネート、３−メチルジフェニルメタンジイソシアネート、ヘキサメチレンジイソシアネート、イソホロンジイソシアネート、ジシクロヘキシルメタン−４，４’−ジイソシアネート、ジシクロヘキシルメタン−２，４’−ジイソシアネート、リジンイソシアネートなどが挙げられる。また、アルミニウムやチタンなどの金属キレート化合物、多官能エポキシ化合物、メラミン樹脂、アマイド樹脂を用いてもよい。 As a crosslinking agent used for the acrylic pressure-sensitive adhesive, known crosslinking agents such as isocyanate, melamine, and epoxy can be used. Examples of the isocyanate-based crosslinking agent include polyisocyanate compounds of polyisocyanates, trimers of these polyisocyanate compounds, terminal isocyanate urethane prepolymers obtained by reacting the above polyisocyanate compounds and polyol compounds, and these polyisocyanate compounds. And trimers of these polyisocyanate compounds. Specific examples of the polyvalent isocyanate include 2,4-tolylene diisocyanate, 2,5-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, diphenylmethane-4,4′-diisocyanate, Examples include 3-methyldiphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4′-diisocyanate, dicyclohexylmethane-2,4′-diisocyanate, and lysine isocyanate. Moreover, you may use metal chelate compounds, such as aluminum and titanium, a polyfunctional epoxy compound, a melamine resin, and an amide resin.
前記架橋剤の添加量としては、アクリル系粘着剤に対して０．００５〜２０重量部、特に０．０１〜１０重量部の割合で添加されるとよい。 The amount of the crosslinking agent added is preferably 0.005 to 20 parts by weight, particularly 0.01 to 10 parts by weight, based on the acrylic pressure-sensitive adhesive.
本発明における粘着剤層の厚みは、通常１０〜１００μｍ、好ましくは１０〜５０μｍとすることが適当である。ここでの粘着剤層の形成方法としては、有機溶剤に溶解し粘度を調整した粘着剤を塗布する方法や水に分散し塗布する方法等の公知の方法を用いることができるが、架橋型アクリル系粘着剤の形成方法としては、有機溶剤に溶解し粘度を調整した粘着剤を塗布する方法が一般的である。 The thickness of the pressure-sensitive adhesive layer in the present invention is usually 10 to 100 μm, preferably 10 to 50 μm. As the method for forming the pressure-sensitive adhesive layer, a known method such as a method of applying a pressure-sensitive adhesive dissolved in an organic solvent or a method of dispersing and applying in water can be used. As a method for forming a pressure-sensitive adhesive, a method of applying a pressure-sensitive adhesive dissolved in an organic solvent and adjusting the viscosity is generally used.
アクリル系の粘着剤組成物として紫外線重合型のものを使用する場合、粘着剤組成物には、主剤であるアクリル酸類のモノマー及び／又はオリゴマーの他、光重合開始剤、紫外線架橋促進剤（増感剤）、希釈剤などの補助材料が配合される。 In the case of using an ultraviolet-polymerization type acrylic pressure-sensitive adhesive composition, the pressure-sensitive adhesive composition includes a photopolymerization initiator, a UV-crosslinking accelerator (increase) in addition to the main monomer and / or oligomer of acrylic acid. Auxiliary materials such as sensitizers and diluents are blended.
前記粘着剤の補助材料としては、他に、フィラー等を含めるものとしても良く、このようなフィラーとしては、光反射防止剤としての無機金属フィラー、硬度や接着性の調整を目的として添加される酢酸ビニル、スチレン、タッキファイヤー（粘着付与剤）等を配合しても良い。ただし、前記補助材料の添加は、得られた粘着剤層の厚み方向における光の複屈折を発生させて透視性を低下させので、特に粘着剤層の厚みを１０〜１００μｍに形成する本発明では、透視性の低下が著しくなることから、これらの添加は行わないか、比較的少量に止めることが好ましい。 As an auxiliary material for the pressure-sensitive adhesive, a filler or the like may be included, and such a filler is added for the purpose of adjusting the hardness or adhesiveness, an inorganic metal filler as a light reflection preventing agent. Vinyl acetate, styrene, tackifier (tackifier) and the like may be blended. However, since the addition of the auxiliary material causes birefringence of light in the thickness direction of the obtained pressure-sensitive adhesive layer and lowers the transparency, particularly in the present invention in which the thickness of the pressure-sensitive adhesive layer is formed to 10 to 100 μm. In view of the remarkable decrease in transparency, it is preferable not to add them or to keep them relatively small.
前記粘着剤の粘着付与剤は、アクリル系粘着剤に粘着性の向上を目的として所望量が添加され、例えばロジン系樹脂、テルペン系樹脂、キシレン系樹脂などが挙げられる。 A desired amount of the tackifier for the pressure-sensitive adhesive is added to the acrylic pressure-sensitive adhesive for the purpose of improving the tackiness, and examples thereof include rosin-based resins, terpene-based resins, and xylene-based resins.
なお、前記粘着剤の希釈剤としては特に制限無く用いることができる。特に、希釈剤としては有機溶剤が望ましく、例えば、アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサン、ベンゼン、トルエン、キシレン、クロルベンゼン、テトラヒドロフラン、メチルセロソルブ、エチルセロソルブ、メチルセロソルブアセテート、エチルセロソルブアセテート、酢酸エチル、１，４−ジオキサン、１，２−ジクロロエタン、ジクロルメタン、クロロホルムなどが挙げられるが、これらに限定されるものではない。 In addition, it can use without a restriction | limiting especially as a diluent of the said adhesive. In particular, an organic solvent is desirable as a diluent, for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexane, benzene, toluene, xylene, chlorobenzene, tetrahydrofuran, methyl cellosolve, ethyl cellosolve, methyl cellosolve acetate, ethyl cellosolve acetate, ethyl acetate. 1,4-dioxane, 1,2-dichloroethane, dichloromethane, chloroform and the like, but are not limited thereto.
（粘着剤層の貯蔵弾性率の測定方法）
粘着剤層の動的粘弾性は、粘弾性試験機（レオメトリックス社製、商品名：ソリキッドメーターＭＲ−３００）を用いて、同試験機の測定部である平行円盤の間に試験片（厚み約１．５ｍｍ）を挟み込み、周波数１Ｈｚで２５℃での貯蔵弾性率（Ｇ’）を測定する。
(Measurement method of storage modulus of adhesive layer)
The dynamic viscoelasticity of the pressure-sensitive adhesive layer is measured using a viscoelasticity tester (manufactured by Rheometrics, trade name: Solid Liquid Meter MR-300) between the parallel disks, which are measuring units of the tester ( A thickness of about 1.5 mm) is sandwiched, and a storage elastic modulus (G ′) at 25 ° C. is measured at a frequency of 1 Hz.
本発明の保護部材ないし、両面粘着シートを構成する粘着剤層は、その貯蔵弾性率が、周波数１Ｈｚにおいて、２５℃で１．０×１０３〜１．０×１０５Ｐａであることが好ましい。前記粘着剤層の貯蔵弾性率が１．０×１０３Ｐａ未満であると、保護部材の打ち抜き加工時の、粘着剤のはみ出しの原因となる。一方、前記粘着剤層の貯蔵弾性率が１．０×１０５Ｐａを超える場合には、粘着剤層の応力緩和性が低下し、保護部材を情報表示画面に貼着する際に、気泡を巻きこみ易くなってしまう。 The protective member of the present invention or the pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive sheet preferably has a storage elastic modulus of 1.0 × 10 3 to 1.0 × 10 5 Pa at 25 ° C. at a frequency of 1 Hz. . When the storage elastic modulus of the pressure-sensitive adhesive layer is less than 1.0 × 10 3 Pa, the pressure-sensitive adhesive protrudes when the protective member is punched. On the other hand, when the storage elastic modulus of the pressure-sensitive adhesive layer exceeds 1.0 × 10 5 Pa, the stress relaxation property of the pressure-sensitive adhesive layer is lowered, and bubbles are formed when the protective member is attached to the information display screen. It becomes easy to entrain.
本発明の粘着剤層のコーティング法としては、溶液型、無溶剤型いずれもコンマナイフコーター、ダイコーター、リーバースコーターなどが挙げられる。無溶剤型ならば押出法、カレンダー法でも構わないが、気泡混入防止の点からからダイコーターが好適である。 Examples of the coating method for the pressure-sensitive adhesive layer of the present invention include a comma knife coater, a die coater, and a reverse coater for both solution type and solventless type. Extrusion methods and calendering methods may be used as long as they are solventless, but a die coater is preferred from the viewpoint of preventing bubbles from being mixed.
（カバーフィルム）
本発明に用いる両面粘着フィルムには、粘着剤層面にポリエステル系樹脂フィルムをカバーフィルムとして貼り合わせることが好ましい。カバーフィルムの中心線表面粗さは０．２０μｍ以下であることが好ましい。より好ましくは、カバーフィルムの表面粗さが０．１０μｍ以下であることが好ましい。中心線表面粗さが０．２０μｍより大きくなるとカバーフィルム表面の粗さが粘着剤層に転写し、粘着剤層の粗さによる光散乱が発生し、透明保護カバーに両面粘着フィルムを貼り付け、情報表示画面用の保護部材として用いたときの視認性が低下するといった問題が発生する場合がある。
(Cover film)
In the double-sided pressure-sensitive adhesive film used in the present invention, a polyester resin film is preferably bonded to the pressure-sensitive adhesive layer surface as a cover film. The centerline surface roughness of the cover film is preferably 0.20 μm or less. More preferably, the surface roughness of the cover film is 0.10 μm or less. When the center line surface roughness is greater than 0.20 μm, the roughness of the cover film surface is transferred to the adhesive layer, light scattering occurs due to the roughness of the adhesive layer, and a double-sided adhesive film is attached to the transparent protective cover, There may be a problem that visibility when used as a protective member for an information display screen is lowered.
カバーフィルムとして使用されるポリエステル系樹脂フィルムとして、寸法安定性、透明性、硬さの点で、二軸延伸ポリエステル系フィルムの使用が好ましい。カバーフィルムとなるポリエステル系樹脂フィルムの厚みは１０〜２００μｍの範囲、硬さと断裁加工性から２５〜１００μｍの範囲のものが好ましい。前記の厚みが１０μｍより薄いとフィルム強度が不足し、カバーフィルム剥離時に破れたり、両面粘着フィルムに貼り合わせる際に、シワが入り易い等の問題が発生する。また、前記厚みが２００μｍより厚いと、フィルム自体が高価になる等の問題が発生する。 The polyester resin film used as the cover film is preferably a biaxially stretched polyester film in terms of dimensional stability, transparency and hardness. The polyester resin film serving as the cover film preferably has a thickness in the range of 10 to 200 [mu] m, and in the range of 25 to 100 [mu] m in view of hardness and cutting processability. When the thickness is less than 10 μm, the film strength is insufficient, and problems such as tearing when the cover film is peeled off and wrinkling easily occur when pasting to a double-sided adhesive film. On the other hand, when the thickness is greater than 200 μm, problems such as an expensive film itself occur.
また前記両面粘着フィルムを前記の透明保護カバーに粘着剤層を介して貼着する場合には、カバーフィルムを剥離して使用するものであり、前記粘着剤層からカバーフィルムを剥離する際の剥離力を調整するために、前記カバーフィルムの粘着剤層貼合面に、シリコーン系剥離剤を塗布しておくことが好ましい。 Moreover, when sticking the said double-sided adhesive film on the said transparent protective cover through an adhesive layer, it peels off and uses a cover film, and peeling when peeling a cover film from the said adhesive layer In order to adjust the force, it is preferable to apply a silicone release agent to the adhesive layer bonding surface of the cover film.
（吸着層）
本発明の保護部材ないし、両面粘着シートを構成する吸着層は、保護部材をディスプレイパネルの情報表示画面等の被着体に貼り付けた後には、経時でずれたりすることなく密着しているが、前記保護部材を貼り直したり、前記被着体から取り外したりする場合には、容易に再剥離することが可能なものである。
(Adsorption layer)
Although the adsorbing layer constituting the protective member or the double-sided pressure-sensitive adhesive sheet of the present invention adheres to the adherend such as the information display screen of the display panel without sticking with time, the protective member is adhered to the adherend. When the protective member is reapplied or removed from the adherend, it can be easily removed again.
本発明の吸着層を形成するための材料としては、特に制限されないが、シリコーン樹脂、ポリエチレン系樹脂、アクリル系樹脂、ポリウレタン系樹脂、ポリアミド系樹脂、フッ素系樹脂、ブタジエン系樹脂、イソプレン系樹脂、スチレン−ブタジエン系樹脂、ビニルアルキルエーテル系樹脂、エチレン−酢酸ビニル共重合体、エチレン−プロピレン−ジエン三元共重合体などの公知の材料が挙げられる。これらの材料は、単独または２種以上を組み合わせて用いることが出来る。 The material for forming the adsorption layer of the present invention is not particularly limited, but silicone resin, polyethylene resin, acrylic resin, polyurethane resin, polyamide resin, fluorine resin, butadiene resin, isoprene resin, Known materials such as styrene-butadiene resins, vinyl alkyl ether resins, ethylene-vinyl acetate copolymers, ethylene-propylene-diene terpolymers, and the like can be mentioned. These materials can be used alone or in combination of two or more.
本発明の吸着層を形成するための材料としては、上記の中でも、シリコーン樹脂であることが好ましい。シリコーン樹脂は、透明性、耐久性に極めて優れているとともに柔軟性を有しているので、ディスプレイパネルの情報表示画面等の被着体への密着性に優れているからである。 Among the above, the material for forming the adsorption layer of the present invention is preferably a silicone resin. This is because the silicone resin is extremely excellent in transparency and durability and has flexibility, and therefore has excellent adhesion to an adherend such as an information display screen of a display panel.
本発明の吸着層に用いるシリコーン樹脂の性状としては、透明性が高く、ゴムのような柔軟性を持っていて被着体の表面に対しても、吸着層の面が被着体表面に沿うことが求められる。さらに剥離の際には、小さい剥離力で、容易に剥離できることが求められる。また、少なくとも厚み１０μｍ以上で、目付け加工の方法を用いることなく、塗布及び加熱処理だけで架橋吸着層を設けるためには、シリコーン組成物の硬化反応に際して、白金触媒等のもとで、１５０℃以下の低温短時間で深部まで架橋し、透明で耐熱性、圧縮永久歪み特性に優れかつ低粘度で液状タイプである、１分子中に２個以上のアルケニル基を有するポリオルガノシロキサンと架橋剤としてＳｉＨ基を有するオルガノハイドロジェンポリシロキサンとの付加反応により熱架橋する付加反応型液状シリコーン組成物の使用が好ましい。 The properties of the silicone resin used in the adsorption layer of the present invention are high in transparency, have flexibility like rubber, and the surface of the adsorption layer is also along the adherend surface with respect to the adherend surface. Is required. Further, when peeling, it is required to be easily peeled with a small peeling force. Further, in order to provide a crosslinked adsorbing layer only by coating and heat treatment with a thickness of at least 10 μm and without using a basis weight processing method, at 150 ° C. under a platinum catalyst or the like during the curing reaction of the silicone composition. As a crosslinker and polyorganosiloxane having two or more alkenyl groups in one molecule, which crosslinks to the deep part in the following low temperature in a short time, is transparent, heat resistant, excellent in compression set, low viscosity and liquid type It is preferable to use an addition reaction type liquid silicone composition that is thermally crosslinked by an addition reaction with an organohydrogenpolysiloxane having a SiH group.
１分子中に２個以上のアルケニル基を有するジオルガノポリシロキサンとしては、両末端にのみビニル基を有する直鎖状ジオルガノポリシロキサンと、両末端及び側鎖にビニル基を有する直鎖状ジオルガノポリシロキサンと、末端にのみビニル基を有する分岐状ジオルガノポリシロキサンと、末端及び側鎖にビニル基を有する分岐状ジオルガノポリシロキサンとから選ばれる少なくとも１種を用いると良い。 Diorganopolysiloxanes having two or more alkenyl groups in one molecule include linear diorganopolysiloxanes having vinyl groups only at both ends and linear diorganopolysiloxanes having vinyl groups at both ends and side chains. It is preferable to use at least one selected from organopolysiloxane, branched diorganopolysiloxane having a vinyl group only at the terminal, and branched diorganopolysiloxane having a vinyl group at the terminal and side chain.
これらのジオルガノポリシロキサンの１形態としては、両末端にのみビニル基を有する直鎖状ジオルガノポリシロキサンで、下記一般式（化１）で表わされる化合物である。 One form of these diorganopolysiloxanes is a linear diorganopolysiloxane having vinyl groups only at both ends, and is a compound represented by the following general formula (Formula 1).
（式中Ｒは下記の有機基、ｎは整数を表す。） (In the formula, R represents the following organic group, and n represents an integer.)
（式中Ｒは下記の有機基、ｎ、ｍは整数を表す。） (In the formula, R represents the following organic group, and n and m represent integers.)
このビニル基以外のケイ素原子に結合した有機基（Ｒ）は異種でも同種でもよいが、具体例としてはメチル基、エチル基、プロピル基などのアルキル基、フェニル基、トリル基、などのアリール基、又はこれらの基の炭素原子に結合した水素原子の一部または全部をハロゲン原子、シアノ基などで置換した同種、または異種の非置換または置換の脂肪族不飽和基を除く１価炭化水素基で、好ましくはその少なくとも５０モル％がメチル基であるものなどが挙げられるが、このジオルガノポリシロキサンは単独でも２種以上の混合物であってもよい。 The organic group (R) bonded to the silicon atom other than the vinyl group may be different or of the same type. Specific examples include alkyl groups such as methyl, ethyl and propyl groups, and aryl groups such as phenyl and tolyl groups. Or a monovalent hydrocarbon group excluding the same or different kinds of unsubstituted or substituted aliphatic unsaturated groups in which some or all of the hydrogen atoms bonded to the carbon atoms of these groups are substituted with halogen atoms, cyano groups, or the like Preferably, at least 50 mol% of them is a methyl group, and the diorganopolysiloxane may be used alone or in a mixture of two or more.
両末端および側鎖にビニル基を有する直鎖状ジオルガノポリシロキサンは、上記一般式（化１）中のＲの一部がビニル基である化合物である。末端にのみビニル基を有する分岐状ポリオルガノシロキサンは、上記一般式（化２）で表わされる化合物である。末端及び側鎖にビニル基を有する分岐状ポリオルガノシロキサンは、上記一般式（化２）中のＲの一部がビニル基である化合物である。 The linear diorganopolysiloxane having vinyl groups at both ends and side chains is a compound in which a part of R in the above general formula (Formula 1) is a vinyl group. The branched polyorganosiloxane having a vinyl group only at the terminal is a compound represented by the above general formula (Formula 2). The branched polyorganosiloxane having vinyl groups at the terminals and side chains is a compound in which a part of R in the above general formula (Formula 2) is a vinyl group.
１分子中に２個以上のアルケニル基を有するジオルガノポリシロキサンの重量平均分子量としては、２０，０００〜７００，０００の範囲のものが好ましい。前記のジオルガノポリシロキサンの重量平均分子量が２０，０００未満であると、硬化性が低下したり、被着体への粘着力が低下してしまう。また、７００，０００を超えてしまうと、組成物の粘度が高くなりすぎて製造時の撹拌が困難になる。 The diorganopolysiloxane having two or more alkenyl groups in one molecule preferably has a weight average molecular weight in the range of 20,000 to 700,000. When the weight average molecular weight of the diorganopolysiloxane is less than 20,000, the curability is lowered or the adhesive force to the adherend is lowered. Moreover, when it exceeds 700,000, the viscosity of a composition will become high too much and stirring at the time of manufacture will become difficult.
ここで架橋反応に用いる架橋剤の例として、オルガノハイドロジェンポリシロキサンが挙げられる。前記オルガノハイドロジェンポリシロキサンは、１分子中にケイ素原子に結合した水素原子を少なくとも３個有するものであるが、実用上からは分子中に２個の≡ＳｉＨ結合を有するものをその全量の５０重量％までとし、残余を分子中に少なくとも３個の≡ＳｉＨ結合を含むものとすることがよい。分子の形状としては、直鎖状、分岐状、環状のものを使用できる。 Here, an example of the crosslinking agent used for the crosslinking reaction is organohydrogenpolysiloxane. The organohydrogenpolysiloxane has at least three hydrogen atoms bonded to silicon atoms in one molecule, but from a practical point of view, it has a total amount of 50 having two ≡SiH bonds in the molecule. It is preferable that the content is up to wt%, and the remainder includes at least three ≡SiH bonds in the molecule. The molecular shape may be linear, branched or cyclic.
前記アルケニル基を有するジオルガノポリシロキサン中のアルケニル基（Ａ）に対する、オルガノハイドロジェンポリシロキサン中のＳｉＨ基（Ｂ）のモル比（Ａ）／（Ｂ）が１．０〜２．０の範囲となるように配合することが好ましい。モル比（Ａ）／（Ｂ）が１．０未満では架橋密度が不足して、これに伴い凝集力、保持力が低くなってしまうことがあり、逆に２．０を超えると架橋密度が高くなり、適度な粘着力及びタック性が得られず、気泡の混入も発生しやすくなる。 The molar ratio (A) / (B) of the SiH group (B) in the organohydrogenpolysiloxane to the alkenyl group (A) in the diorganopolysiloxane having the alkenyl group is in the range of 1.0 to 2.0. It is preferable to mix | blend so that it may become. If the molar ratio (A) / (B) is less than 1.0, the crosslink density is insufficient, and the cohesive force and holding power may decrease accordingly. It becomes high, moderate adhesive strength and tackiness cannot be obtained, and bubbles are likely to be mixed.
架橋反応に用いる付加反応触媒は、塩化白金酸、塩化白金酸のアルコール溶液、塩化白金酸とアルコールとの反応物、塩化白金酸とオレフィン化合物との反応物、塩化白金酸とビニル基含有シロキサンとの反応物、白金−オレフィン錯体、白金−ビニル基含有シロキサン錯体、ロジウム錯体、ルテニウム錯体などが挙げられる。また、これらのものをイソプロパノール、トルエンなどの溶剤や、シリコーンオイルなどに溶解、分散させたものを用いてもよい。架橋反応した吸着層は、シリコーンゴムのような柔軟性を持ったものとなり、この柔軟性が被着体との密着を容易にさせるものである。 The addition reaction catalyst used for the crosslinking reaction is chloroplatinic acid, alcohol solution of chloroplatinic acid, a reaction product of chloroplatinic acid and alcohol, a reaction product of chloroplatinic acid and olefin compound, chloroplatinic acid and vinyl group-containing siloxane, Reaction products, platinum-olefin complexes, platinum-vinyl group-containing siloxane complexes, rhodium complexes, ruthenium complexes, and the like. Moreover, you may use what melt | dissolved and disperse | distributed these things to solvents, such as isopropanol and toluene, or silicone oil. The adsorption layer subjected to the crosslinking reaction has flexibility such as silicone rubber, and this flexibility facilitates the close contact with the adherend.
添加量はシリコーン組成物の合計１００重量部に対し、貴金属分として５〜２，０００ｐｐｍ、特に１０〜５００ｐｐｍとすることが好ましい。５ｐｐｍ未満では硬化性が低下し、架橋密度が低くなり、保持力が低下することがあり、２，０００ｐｐｍを超えると処理浴の使用可能時間が短くなる場合がある。 The addition amount is preferably 5 to 2,000 ppm, particularly preferably 10 to 500 ppm as a noble metal component with respect to a total of 100 parts by weight of the silicone composition. If it is less than 5 ppm, the curability is lowered, the crosslinking density is lowered and the holding power may be lowered, and if it exceeds 2,000 ppm, the usable time of the treatment bath may be shortened.
本発明に係るシリコーンの市販品の形状は、無溶剤型、溶剤型、エマルション型があるが、いずれの型も使用できる。なかでも、無溶剤型は、溶剤を使用しないため、安全性、衛生性、大気汚染の面で非常に利点がある。但し、無溶剤型であっても、所望の膜厚を得るための粘度調節のために、必要に応じてトルエン、キシレンなどの芳香族炭化水素系溶剤、ヘキサン、ヘプタン、オクタン、イソパラフィンなどの脂肪族炭化水素系溶剤、メチルエチルケトン、メチルイソブチルケトンなどのケトン系溶剤、酢酸エチル、酢酸イソブチルなどのエステル系溶剤、ジイソプロピルエーテル、１、４−ジオキサンなどのエーテル系溶剤、またはこれらの混合溶剤などが使用される。 The shape of the commercially available silicone product according to the present invention includes a solventless type, a solvent type, and an emulsion type, but any type can be used. Especially, since the solventless type does not use a solvent, it is very advantageous in terms of safety, hygiene, and air pollution. However, even in the solventless type, if necessary, an aromatic hydrocarbon solvent such as toluene or xylene, or a fat such as hexane, heptane, octane or isoparaffin is used to adjust the viscosity to obtain a desired film thickness. Use of aromatic hydrocarbon solvents, ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone, ester solvents such as ethyl acetate and isobutyl acetate, ether solvents such as diisopropyl ether and 1,4-dioxane, or mixed solvents thereof Is done.
添加量はシリコーン組成物の合計１００重量部に対し、２０〜１，０００重量部、特に２５〜９００重量部とすることが好ましい。２０重量部未満では、吸着層と基材の密着性が低下してする場合があり、１，０００重量部を超えると、シリコーン組成物の塗工液の粘度が低くなりすぎるので、塗工後から硬化までの間に、塗工された吸着層が一部流動し、吸着層表面の均一性が低下してしまう。 The addition amount is preferably 20 to 1,000 parts by weight, particularly 25 to 900 parts by weight, based on 100 parts by weight of the total silicone composition. If it is less than 20 parts by weight, the adhesion between the adsorption layer and the substrate may be lowered. If it exceeds 1,000 parts by weight, the viscosity of the coating liquid of the silicone composition becomes too low. During the period from the curing to the curing, the coated adsorption layer partially flows, and the uniformity of the adsorption layer surface is lowered.
前述のごとく、吸着層の性状としては、ゴムのような柔軟性を持っていて被着体への貼着時に被着体の表面の凹凸に追従して密着力を確保することが求められる。そして、例えば前記情報表示画面の保護部材として両面粘着フィルムを使用する場合、吸着層の膜厚は、被着体に対する吸着層の密着面方向の剪断力を確保するために少なくとも１０μｍ以上、通常は１０〜１００μｍが好ましい。本発明の場合、気泡の混入を防止し、気泡吸収性を確保するために、吸着層の厚みとしては、２０〜１００μｍであることがより好ましい。１０μｍ未満であると被着体に対する保護部材の密着面方向の剪断力が確保できず、特に長期貼り付け時には、保護部材が被着体から剥がれ易い。また、吸着層の厚みが１００μｍを超える場合には、シリコーン組成物の使用量が多くなり、両面粘着フィルムの製造コストの上昇を招いてしまう。 As described above, the properties of the adsorbing layer are required to have a softness like rubber and follow the irregularities on the surface of the adherend to ensure adhesion when adhered to the adherend. And, for example, when using a double-sided adhesive film as the protective member for the information display screen, the film thickness of the adsorption layer is at least 10 μm or more in order to ensure the shearing force in the adhesion surface direction of the adsorption layer with respect to the adherend. 10-100 micrometers is preferable. In the case of the present invention, the thickness of the adsorption layer is more preferably 20 to 100 μm in order to prevent air bubbles from being mixed and to ensure air bubble absorbability. When the thickness is less than 10 μm, the shearing force in the adhesion surface direction of the protective member with respect to the adherend cannot be secured, and the protective member is easily peeled off from the adherend, particularly when applied for a long time. Moreover, when the thickness of an adsorption layer exceeds 100 micrometers, the usage-amount of a silicone composition will increase and the raise of the manufacturing cost of a double-sided adhesive film will be caused.
（吸着層の貯蔵弾性率の測定方法）
吸着層の動的粘弾性は、粘着剤層の動的粘弾性と同様に、粘弾性試験機（レオメトリックス社製、商品名：ソリキッドメーターＭＲ−３００）を用いて、同試験機の測定部である平行円盤の間に試験片（厚み約１．５ｍｍ）を挟み込み、周波数１Ｈｚで２５℃での貯蔵弾性率（Ｇ’）を測定する。
(Measurement method of storage modulus of adsorption layer)
The dynamic viscoelasticity of the adsorption layer is measured by the same viscoelasticity tester (manufactured by Rheometrics Co., Ltd., trade name: Solid Liquid MR-300) in the same manner as the dynamic viscoelasticity of the adhesive layer. A test piece (thickness of about 1.5 mm) is sandwiched between parallel disks as parts, and the storage elastic modulus (G ′) at 25 ° C. is measured at a frequency of 1 Hz.
本発明の保護部材ないし、両面粘着シートを構成する吸着層は、その貯蔵弾性率が、周波数１Ｈｚにおいて、２５℃で１．０×１０４〜３．５×１０５Ｐａであることが好ましい。前記吸着層の貯蔵弾性率が１．０×１０４Ｐａ未満であると、保護部材の打ち抜き加工時の、粘着剤のはみ出しの原因となる。一方、前記吸着層の貯蔵弾性率が３．５×１０５Ｐａを超える場合には、粘着剤層の応力緩和性が低下し、保護部材を情報表示画面に貼着する際に、気泡を巻きこみ易くなってしまう。 It is preferable that the adsorbing layer constituting the protective member or the double-sided pressure-sensitive adhesive sheet of the present invention has a storage elastic modulus of 1.0 × 10 4 to 3.5 × 10 5 Pa at 25 ° C. at a frequency of 1 Hz. If the storage elastic modulus of the adsorption layer is less than 1.0 × 10 4 Pa, it will cause the adhesive to stick out during the punching process of the protective member. On the other hand, when the storage elastic modulus of the adsorption layer exceeds 3.5 × 10 5 Pa, the stress relaxation property of the pressure-sensitive adhesive layer is lowered, and bubbles are involved when the protective member is attached to the information display screen. It becomes easy.
本発明において、粘着剤層の２５℃における貯蔵弾性率（Ａ）と吸着層の２５℃における貯蔵弾性率（Ｂ）の比（Ｂ）／（Ａ）が、０．９以上、６０以下であることが好ましい。
さらに前記（Ｂ）／（Ａ）が、０．９以上、５．０以下であることが特に好ましい。前記（Ｂ）／（Ａ）が、０．９未満の場合は、粘着剤層に対して吸着層が相対的に柔軟な層となり、前記粘着層が塑性変形しにくくなり、前記吸着層の凹凸が解消されず、結果として保護部材の表示画面への貼り付け時に、微小気泡の巻き込みが発生してしまう。一方、前記（Ｂ）／（Ａ）が６０を超える場合には、前記吸着層の保護部材の表示画面への密着力が低下し、経時的に保護部材が剥がれたりする可能性が高くなる。
In the present invention, the ratio (B) / (A) of the storage elastic modulus (A) at 25 ° C. of the pressure-sensitive adhesive layer and the storage elastic modulus (B) at 25 ° C. of the adsorption layer is 0.9 or more and 60 or less. It is preferable.
Furthermore, it is particularly preferable that (B) / (A) is 0.9 or more and 5.0 or less. When (B) / (A) is less than 0.9, the adsorption layer becomes a relatively flexible layer with respect to the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is hardly plastically deformed. Is not solved, and as a result, entrapment of microbubbles occurs when the protective member is attached to the display screen. On the other hand, when (B) / (A) exceeds 60, the adhesion force of the protective layer to the display screen of the protective member decreases, and the possibility that the protective member peels off with time increases.
（アンカー層）
本発明においては、基材フィルムと吸着層との接着力の向上、および被着体への保護部材の貼着後、前記保護部材を再剥離する際に、前記吸着層と基材フィルム間で剥離することなく、被着体からスムーズに剥離できることを目的として、前記基材フィルムと吸着層との間にアンカー層を設けてもよい。
(Anchor layer)
In the present invention, when the protective member is peeled again after improving the adhesive force between the base film and the adsorbing layer and attaching the protective member to the adherend, between the adsorbing layer and the base film. An anchor layer may be provided between the base film and the adsorption layer for the purpose of smoothly peeling from the adherend without peeling.
アンカー層の材料としては、ポリエステル系樹脂、アクリル系樹脂、ウレタン系樹脂等が挙げられる。中でもアクリル系樹脂が好ましく、特にアクリルポリオール樹脂が、帯電防止性や被膜特性の観点から好ましい。 Examples of the material for the anchor layer include polyester resins, acrylic resins, and urethane resins. Of these, acrylic resins are preferred, and acrylic polyol resins are particularly preferred from the viewpoint of antistatic properties and film properties.
また、アンカー層には、その他配合材料として帯電防止剤を添加し帯電防止機能を付与することができる。ノニオン系としてポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェノール、ポリオキシエチレンアルキルアミン、ポリオキシエチレンアルキルアミド、脂肪酸ポリエチレングリコールエステル、脂肪酸ソルビタンエステル、ポリオキシエチレン脂肪酸ソルビタンエステル、脂肪酸グリセリンエステル、アルキルポリエチレンイミン等を挙げることができる。またエチレンオキサイドを骨格に持つアクリレート化合物なども使用することができる。導電性高分子としてポリアニリン、ポリピロール、ポリチオフェン、ポリ３、４−エチレンジオキシチオフェン及びこれらの誘導体を使用することができる。金属酸化物としてアンチモンドープ型酸化錫（ＡＴＯ）、錫ドープ型酸化インジウム（ＩＴＯ）、アルミニウムドープ型酸化亜鉛、アンチモン副酸化物などを使用することができる。 In addition, an antistatic agent can be added to the anchor layer as an additional compounding material to impart an antistatic function. Nonionic polyoxyethylene alkyl ether, polyoxyethylene alkylphenol, polyoxyethylene alkylamine, polyoxyethylene alkylamide, fatty acid polyethylene glycol ester, fatty acid sorbitan ester, polyoxyethylene fatty acid sorbitan ester, fatty acid glycerin ester, alkyl polyethyleneimine, etc. Can be mentioned. An acrylate compound having ethylene oxide as a skeleton can also be used. Polyaniline, polypyrrole, polythiophene, poly3,4-ethylenedioxythiophene, and derivatives thereof can be used as the conductive polymer. As the metal oxide, antimony-doped tin oxide (ATO), tin-doped indium oxide (ITO), aluminum-doped zinc oxide, antimony suboxide, or the like can be used.
アンカー層の厚みは０．０１〜５．０μｍの範囲、より好ましくは０．１０〜３．０μｍの範囲が好適である。アンカー層の厚みが、前記厚みが０．０１μｍ未満であると熱架橋された吸着層が基材フィルムより離脱し易くなる。さらに帯電防止性能が安定しない。一方前記厚みが５．０μｍを超えるとアンカー層の柔軟性が無くなり硬い層となり、基材フィルムへの密着性が悪くなる。 The thickness of the anchor layer is preferably in the range of 0.01 to 5.0 μm, more preferably in the range of 0.10 to 3.0 μm. When the thickness of the anchor layer is less than 0.01 μm, the thermally crosslinked adsorption layer is easily detached from the base film. Furthermore, the antistatic performance is not stable. On the other hand, when the thickness exceeds 5.0 μm, the anchor layer becomes inflexible and becomes a hard layer, resulting in poor adhesion to the base film.
アンカー層塗工液、吸着層塗工液の塗工方法としては、３本オフセットグラビアコーターや５本ロールコーターに代表される多段ロールコーター、ダイレクトグラビアコーター、バーコーター、エアナイフコーター等公知の方法が適宜使用される。 As an application method of the anchor layer coating solution and the adsorption layer coating solution, known methods such as a multi-stage roll coater represented by a three-offset gravure coater and a five-roll coater, a direct gravure coater, a bar coater, and an air knife coater are available. Used as appropriate.
（セパレータ）
本発明においては、吸着層の表面の汚れや異物付着を防いだり、両面粘着フィルムのハンドリングを向上させるため、そして特に前記両面粘着フィルムを透明保護カバーに貼り合わせて情報表示画面の保護部材として用いたときに、気泡の混入を抑える目的で、プラスチックフィルムからなるセパレータを吸着層面に貼り合わせて用いる。
(Separator)
In the present invention, the surface of the adsorption layer is prevented from being stained and foreign matter adhered, and the handling of the double-sided pressure-sensitive adhesive film is improved. In order to prevent air bubbles from being mixed, a separator made of a plastic film is attached to the surface of the adsorption layer.
本発明の両面粘着フィルムのセパレータには、プラスチックフィルムが用いられる。例えば、ポリエステルフィルム、ポリプロピレンフィルム、ポリエチレンフィルム、ポリカーボネートフィルム、ポリスチレンフィルム等を挙げることができる。これらの中で、生産性、加工性に優れるポリエステルフィルムが好ましく使用できる。また、このようなポリエステルフィルムには二軸延伸フィルム、一軸延伸フィルム、無延伸フィルムがあり、そのいずれも使用できるが、特に二軸延伸フィルムが汎用的であり好ましく使用できる。プラスチックフィルムの厚さとしては、２５〜２００μｍが好ましく用いられる。２５μｍより薄いとフィルム強度が不足し、十分な保護性能が得られない。剥離時にフィルムが破れる等の問題が発生する。また、２００μｍより厚いとフィルム自体が高価になる等の問題が発生する。 A plastic film is used for the separator of the double-sided pressure-sensitive adhesive film of the present invention. For example, a polyester film, a polypropylene film, a polyethylene film, a polycarbonate film, a polystyrene film, etc. can be mentioned. Among these, a polyester film excellent in productivity and processability can be preferably used. Such polyester films include a biaxially stretched film, a uniaxially stretched film, and an unstretched film, and any of them can be used. In particular, a biaxially stretched film is generally used and can be preferably used. The thickness of the plastic film is preferably 25 to 200 μm. If it is thinner than 25 μm, the film strength is insufficient and sufficient protection performance cannot be obtained. Problems such as tearing of the film during peeling occur. On the other hand, if it is thicker than 200 μm, the film itself becomes expensive.
前記吸着層面に貼り合わせるセパレータの中心線表面粗さＲａは０．２０μｍ以下とすることが好ましい。より好ましくは、セパレータの中心線表面粗さが０．１０μｍ以下である。前記中心線表面粗さが０．２μｍより大きくなると、セパレータ表面の粗さが吸着層面に転写し、粘着剤層の粗さによる光散乱が発生し、透明保護カバーに両面粘着フィルムを貼り付け、情報表示画面用の保護部材として用いたときの視認性が低下するといった問題が発生する。また、両面粘着フィルムを用いて、ガラスやアクリル等の硬質板である透明保護カバーと前記粘着剤層を介して積層した保護部材としてディスプレイパネルの情報表示画面へ貼り付けた時に、気泡の混入が発生しやすくなるといった問題がある。 The center line surface roughness Ra of the separator to be bonded to the adsorption layer surface is preferably 0.20 μm or less. More preferably, the center line surface roughness of the separator is 0.10 μm or less. When the center line surface roughness is greater than 0.2 μm, the roughness of the separator surface is transferred to the surface of the adsorption layer, light scattering due to the roughness of the adhesive layer occurs, and a double-sided adhesive film is attached to the transparent protective cover, There arises a problem that visibility when used as a protective member for an information display screen is lowered. In addition, when a double-sided adhesive film is used and a transparent protective cover made of a hard plate such as glass or acrylic and a protective member laminated through the adhesive layer, bubbles are mixed into the information display screen of the display panel. There is a problem that it is likely to occur.
（中心線表面粗さの測定方法）
本発明における中心線表面粗さの測定は、接触型表面粗さ計（株式会社小坂研究所製、ＡＹ−２２）を用いて行い、測定した得られた中心線平均粗さＲａを用いる。具体的には、
セパレータをＳＵＳ板に２ｋｇのハンドローラーを用いて一往復にて貼り付ける。貼り付けたセパレータの吸着層側となる面の中心線平均粗さＲａ（μｍ）を、ＪＩＳ Ｂ０６０１（２００１）に準じ、触針先端径２μｍ、測定長４ｍｍ、カットオフ０．８ｍｍにて測定する。
(Measurement method of centerline surface roughness)
The measurement of the centerline surface roughness in the present invention is performed using a contact type surface roughness meter (AY-22, manufactured by Kosaka Laboratory Ltd.), and the measured centerline average roughness Ra is used. In particular,
The separator is attached to the SUS plate in one reciprocation using a 2 kg hand roller. The center line average roughness Ra (μm) of the surface on the adsorbing layer side of the attached separator is measured according to JIS B0601 (2001) at a stylus tip diameter of 2 μm, a measurement length of 4 mm, and a cutoff of 0.8 mm. .
また、吸着層からのセパレータの剥離力は、０．０１〜１．１５Ｎ／２５ｍｍが好ましい。より好ましくは、０．０１〜０．５０Ｎ／２５ｍｍである。セパレータの剥離力が１．１５Ｎ／２５ｍｍより大きいと、セパレータの剥離作業性が悪化する、セパレータのスムーズな剥離ができず粘着フィルムに折れシワや吸着層表面に段差が発生する等の問題が発生する。 Further, the peeling force of the separator from the adsorption layer is preferably 0.01 to 1.15 N / 25 mm. More preferably, it is 0.01-0.50 N / 25mm. If the peeling force of the separator is greater than 1.15 N / 25 mm, the separator peeling workability deteriorates, and the separator cannot be peeled smoothly, causing problems such as wrinkles on the adhesive film and steps on the adsorption layer surface. To do.
吸着層からのセパレータの剥離力は、両面粘着フィルムを２５ｍｍ幅にカットし、前記両面粘着フィルムの吸着層をセパレータに２Ｋｇのローラーを１往復させる方式で圧着し、圧着後室温で２４時間放置した。次に、引っ張り試験機を用いて、前記セパレータを１８０°の剥離角度、剥離速度：１，２００ｍｍ／ｍｉｎで剥離し、両面粘着フィルムのセパレータの剥離力（Ｎ／２５ｍｍ）を測定した。 The peeling force of the separator from the adsorbing layer was such that the double-sided adhesive film was cut to a width of 25 mm, the adsorbing layer of the double-sided adhesive film was pressure-bonded by reciprocating a 2 kg roller once, and allowed to stand at room temperature for 24 hours after pressure bonding. . Next, using a tensile tester, the separator was peeled at a peeling angle of 180 ° and a peeling speed of 1,200 mm / min, and the peeling force (N / 25 mm) of the separator of the double-sided pressure-sensitive adhesive film was measured.
以下、実施例と比較例を示して本発明を詳細に説明するが、本発明は下記の実施例に制限されるものではない。なお、各実施例中の「部」は特に断ることのない限り重量部を示したものである。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated in detail, this invention is not restrict | limited to the following Example. In the examples, “parts” indicates parts by weight unless otherwise specified.
（実施例１〜９、比較例１〜４）
プラズマ処理された厚み５０μｍのポリエチレンテレフタレートフィルムの片面に、下記アンカー層塗工液をグラビアコーターで塗工、乾燥して、厚み２．０μｍのアンカー層を形成した。
(Examples 1-9, Comparative Examples 1-4)
The following anchor layer coating solution was applied with a gravure coater on one side of a plasma-treated polyethylene terephthalate film having a thickness of 50 μm, and an anchor layer having a thickness of 2.0 μm was formed.
（アンカー層塗工液）
アクリルポリオール樹脂 ２０部
（東レファインケミカル製、コータックスＬＨ４５５、固形分：５０％）
ポリチオフェン ２７部
（信越ポリマー製、セプルジーダＯＣ−ＳＣ１００、固形分：３％）
ＭＥＫ ４０部
トルエン １３部
(Anchor layer coating solution)
20 parts of acrylic polyol resin (manufactured by Toray Fine Chemicals, Cotax LH455, solid content: 50%)
27 parts of polythiophene (manufactured by Shin-Etsu Polymer, Sepulzida OC-SC100, solid content: 3%)
MEK 40 parts Toluene 13 parts
（実施例１〜９、比較例１〜４）
前記のアンカー層の上に、表１に記載の各吸着層塗工液を、表３に記載の吸着層の厚みとの組み合わせで、ダイコーターにて塗工して設けた後、オーブンにて１５０℃、１００秒で加熱、乾燥させて、各実施例及び比較例の吸着層を形成した。
(Examples 1-9, Comparative Examples 1-4)
On each of the anchor layers, each of the adsorbing layer coating liquids shown in Table 1 was applied by a die coater in combination with the thickness of the adsorbing layer shown in Table 3, and then placed in an oven. By heating and drying at 150 ° C. for 100 seconds, the adsorption layers of the examples and comparative examples were formed.
（実施例１〜９、比較例１〜４）
前記の吸着層が形成された各粘着フィルムの吸着層面に、厚さが３８μｍのポリエチレンテレフタレートフィルムにシリコーン系剥離剤を塗工したセパレータを２本のゴムロールにて挟み込み、空気を逃がしながら両者を貼り合わせた後、プラズマ処理された厚み５０μｍのポリエチレンテレフタレートフィルムの片面に吸着層、セパレータが積層された粘着フィルムを得た。
(Examples 1-9, Comparative Examples 1-4)
A separator made by applying a silicone release agent to a polyethylene terephthalate film with a thickness of 38 μm is sandwiched between two rubber rolls on the adhesive layer surface of each pressure-sensitive adhesive film on which the above-mentioned adsorption layer is formed. After combining, a pressure-sensitive adhesive film in which an adsorption layer and a separator were laminated on one side of a plasma-treated 50 μm thick polyethylene terephthalate film was obtained.
（実施例１〜９、比較例１〜４）
前記の粘着フィルムの、吸着層が形成された面とは反対側の面に、表２に記載の各粘着剤層層塗工液を、表３に記載の粘着剤層の厚みとの組み合わせで、ダイコーターで塗工し、１００℃で２分間加熱、乾燥して、各実施例及び比較例の粘着剤層を形成した。
(Examples 1-9, Comparative Examples 1-4)
Each pressure-sensitive adhesive layer coating liquid described in Table 2 is combined with the thickness of the pressure-sensitive adhesive layer described in Table 3 on the surface of the pressure-sensitive adhesive film opposite to the surface on which the adsorption layer is formed. Then, it was coated with a die coater, heated at 100 ° C. for 2 minutes, and dried to form the pressure-sensitive adhesive layer of each Example and Comparative Example.
（実施例１〜９、比較例１〜４）
前記の粘着剤層が形成された各粘着フィルムの粘着剤面に、厚さが３８μｍのポリエチレンテレフタレートフィルムにシリコーン系剥離剤を塗工したカバーフィルムを２本のゴムロールにて挟み込み、空気を逃がしながら両者を貼り合わせた後、本発明の両面粘着フィルムを得た。
(Examples 1-9, Comparative Examples 1-4)
While sandwiching a cover film in which a silicone release agent is applied to a polyethylene terephthalate film having a thickness of 38 μm between two adhesive rolls on the adhesive surface of each adhesive film on which the adhesive layer is formed, air escapes After bonding both together, the double-sided pressure-sensitive adhesive film of the present invention was obtained.
各実施例、比較例の評価結果を表３に、各評価方法を下記に示す。 The evaluation results of each example and comparative example are shown in Table 3, and each evaluation method is shown below.
（評価方法） (Evaluation method)
（粘着剤層及び吸着層の貯蔵弾性率）
吸着層の貯蔵弾性率測定は、厚みが５０μｍのフッ素樹脂製シートの片面に、表１に記載の各吸着層成分を、乾燥後の厚みで約１．５ｍｍとなるように吸着層を設けた後、ギアオーブンにて１５０℃、１００秒で加熱、乾燥させた。得られた各吸着層を前記のフッ素樹脂製シートから剥がし取り、粘弾性測定用の試験片を作製した。
(Storage modulus of adhesive layer and adsorption layer)
The storage elastic modulus of the adsorption layer was measured by providing an adsorption layer on one side of a fluororesin sheet having a thickness of 50 μm so that each of the adsorption layer components shown in Table 1 had a thickness after drying of about 1.5 mm. Thereafter, it was heated and dried in a gear oven at 150 ° C. for 100 seconds. Each obtained adsorption layer was peeled off from the said fluororesin sheet | seat, and the test piece for a viscoelasticity measurement was produced.
粘着剤層の貯蔵弾性率測定は、厚みが５０μｍのフッ素樹脂製シートの片面に、表２に記載の各粘着剤層成分を、乾燥後の厚みで約１．５ｍｍとなるように粘着剤層を設けた後、ギアオーブンにて１００℃で、２分間加熱、乾燥させた。得られた各粘着剤層を前記のフッ素樹脂製シートから剥がし取り、粘弾性測定用の試験片を作製した。 The storage elastic modulus of the pressure-sensitive adhesive layer was measured on one side of a 50 μm-thick fluororesin sheet so that each pressure-sensitive adhesive layer component shown in Table 2 was about 1.5 mm in thickness after drying. Then, it was heated and dried at 100 ° C. for 2 minutes in a gear oven. Each obtained adhesive layer was peeled off from the said fluororesin sheet | seat, and the test piece for a viscoelasticity measurement was produced.
次に粘弾性試験機（レオメトリックス社製、商品名：ソリキッドメーターＭＲ−３００）を用いて、同試験機の測定部である平行円盤の間に試験片（厚み約１．５ｍｍ）を挟み込み、周波数１Ｈｚで２５℃の吸着層及び粘着剤層の貯蔵弾性率（Ｇ’）をそれぞれ測定した。 Next, a test piece (thickness of about 1.5 mm) is sandwiched between parallel disks which are measuring units of the testing machine using a viscoelasticity testing machine (trade name: Solid Liquid Meter MR-300, manufactured by Rheometrics). The storage elastic modulus (G ′) of the adsorption layer and the pressure-sensitive adhesive layer at 25 ° C. at a frequency of 1 Hz was measured.
（吸着性能評価）
上記作成した両面粘着フィルムを２５ｍｍ幅にカットし、吸着層のセパレータを剥離した。次いで、前記吸着層を厚み３ｍｍのソーダ石灰ガラス板に２Ｋｇのハンドローラーを１往復させる方式で圧着し、圧着後室温で２４時間放置した。次に、引張り試験機を用いて、１８０°の剥離角度、剥離速度：１２００ｍｍ／ｍｉｎで剥離し、吸着フィルムのガラス板剥離力（ｍＮ／２５ｍｍ）を測定した。
吸着性能の評価基準
◎：ガラス板剥離力が２５ｍＮ／２５ｍｍ以上、１５０ｍＮ／２５ｍｍ未満
○：ガラス板剥離力が１５０ｍＮ／２５ｍｍ以上、４００ｍＮ／２５ｍｍ未満
×：ガラス板剥離力が２５ｍＮ／２５ｍｍ未満、４００ｍＮ／２５ｍｍ以上
(Adsorption performance evaluation)
The prepared double-sided pressure-sensitive adhesive film was cut into a width of 25 mm, and the separator of the adsorption layer was peeled off. Next, the adsorbing layer was pressure-bonded to a 3 mm thick soda-lime glass plate by reciprocating a 2 kg hand roller once and left at room temperature for 24 hours after pressure bonding. Next, using a tensile tester, peeling was performed at a peeling angle of 180 ° and a peeling speed of 1200 mm / min, and the glass plate peeling force (mN / 25 mm) of the adsorption film was measured.
Evaluation standard of adsorption performance A: Glass plate peeling force is 25 mN / 25 mm or more and less than 150 mN / 25 mm ○: Glass plate peeling force is 150 mN / 25 mm or more and less than 400 mN / 25 mm X: Glass plate peeling force is less than 25 mN / 25 mm, 400 mN / 25mm or more
（粘着剤のはみ出し評価）
上記作成した両面粘着フィルムを１２０ｍｍ×５５ｍｍにカットし、予め表面に光反射材層が設けられた、厚み０．４ｍｍ、サイズ１２０ｍｍ×５５ｍｍの透明保護カバー（ガラス板）に前記両面粘着フィルムを粘着剤層を介して貼り合わせ、前記両面粘着フィルムの表面側から、２ｋｇのハンドローラを用いて荷重をかけて２往復させた後、常温（２５℃）で、２４時間放置して、本発明の情報表示画面用の保護部材を得た。前記保護部材を、６０℃で９６時間保存した後、２４時間常温で放置する。２４時間放置後の、前記保護部材の端面の状態を目視確認した。
評価基準
○：端面よりの粘着剤のはみ出しなし
×：端面よりの粘着剤のはみ出しあり
(Evaluation of adhesive sticking out)
The double-sided adhesive film created above is cut into 120 mm x 55 mm, and the double-sided adhesive film is adhered to a transparent protective cover (glass plate) having a thickness of 0.4 mm and a size of 120 mm x 55 mm, which is previously provided with a light reflecting material layer. After pasting together through the agent layer and reciprocating two times using a 2 kg hand roller from the surface side of the double-sided pressure-sensitive adhesive film, it was allowed to stand at room temperature (25 ° C.) for 24 hours. A protective member for an information display screen was obtained. The protective member is stored at 60 ° C. for 96 hours and then left at room temperature for 24 hours. The state of the end face of the protective member after standing for 24 hours was visually confirmed.
Evaluation criteria ○: No adhesive sticking out of the end face ×: Adhesive sticking out of the end face
（微細気泡の混入評価）
保護部材の作成方法は上記と同じ。前記保護部材を厚み３ｍｍ、サイズ１５０ｍｍ×１００ｍｍのソーダ石灰ガラス板に貼り合わせ、微細気泡の混入を目視確認した。
評価基準
◎：気泡の混入が全くない
○：気泡の大きさが２ｍｍ以下のものが、５個未満である
×：気泡の大きさが２ｍｍ以下のものが、５個以上ある
(Evaluation of mixing of fine bubbles)
The method for creating the protective member is the same as described above. The protective member was bonded to a soda-lime glass plate having a thickness of 3 mm and a size of 150 mm × 100 mm, and the presence of fine bubbles was visually confirmed.
Evaluation Criteria ◎: No bubbles are mixed ○: Bubbles with a size of 2 mm or less are less than 5 ×: Bubbles with a size of 2 mm or less are 5 or more
１ 基材フィルム
１０ 両面粘着フィルム
２ アンカー層
２０ 透明保護カバー
３ 吸着層
３０ 情報表示画面用の保護部材
４ セパレータ
５ 粘着剤層
６ カバーフィルム
７ 透明保護カバー（硬質樹脂板またはガラス板）
８ 光反射防止層
DESCRIPTION OF
8 Light reflection prevention layer
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014115354A JP6383967B2 (en) | 2014-06-04 | 2014-06-04 | Protective member for information display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014115354A JP6383967B2 (en) | 2014-06-04 | 2014-06-04 | Protective member for information display screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2015229700A JP2015229700A (en) | 2015-12-21 |
| JP6383967B2 true JP6383967B2 (en) | 2018-09-05 |
Family
ID=54886668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014115354A Active JP6383967B2 (en) | 2014-06-04 | 2014-06-04 | Protective member for information display screen |
Country Status (1)
| Country | Link |
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| JP (1) | JP6383967B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018172473A (en) * | 2017-03-31 | 2018-11-08 | リンテック株式会社 | Adhesive film for display protection |
| CN111028690B (en) * | 2019-12-25 | 2021-10-22 | 霸州市云谷电子科技有限公司 | Display screen and display screen processing method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3878386B2 (en) * | 2000-02-23 | 2007-02-07 | 三菱樹脂株式会社 | Intermediate film adhesive sheet and laminated glass laminate |
| JP2004292493A (en) * | 2003-03-25 | 2004-10-21 | Shin Etsu Polymer Co Ltd | Double-sided adhesive |
| JP5049144B2 (en) * | 2008-01-22 | 2012-10-17 | 東洋紡績株式会社 | Image display device manufacturing method, and image display device manufactured using the manufacturing method |
| EP2650340A3 (en) * | 2008-10-15 | 2014-04-16 | Mitsubishi Plastics, Inc. | Transparent adhesive sheet and image display device |
| JP6268875B2 (en) * | 2013-09-28 | 2018-01-31 | 三菱ケミカル株式会社 | Release film |
| JP6310062B2 (en) * | 2014-03-31 | 2018-04-11 | リンテック株式会社 | Double-sided adhesive sheet |
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2014
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| JP2015229700A (en) | 2015-12-21 |
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