WO2018211586A1 - Film adhésif - Google Patents

Film adhésif Download PDF

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Publication number
WO2018211586A1
WO2018211586A1 PCT/JP2017/018344 JP2017018344W WO2018211586A1 WO 2018211586 A1 WO2018211586 A1 WO 2018211586A1 JP 2017018344 W JP2017018344 W JP 2017018344W WO 2018211586 A1 WO2018211586 A1 WO 2018211586A1
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WO
WIPO (PCT)
Prior art keywords
layer
adhesive film
elastic modulus
storage elastic
adhered
Prior art date
Application number
PCT/JP2017/018344
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English (en)
Japanese (ja)
Inventor
公男 豊田
泰輔 岡本
裕芳 池川
Original Assignee
岩谷産業株式会社
株式会社テクノフローワン
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by 岩谷産業株式会社, 株式会社テクノフローワン filed Critical 岩谷産業株式会社
Priority to PCT/JP2017/018344 priority Critical patent/WO2018211586A1/fr
Publication of WO2018211586A1 publication Critical patent/WO2018211586A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds

Definitions

  • the present invention relates to an adhesive film.
  • the present invention relates to a pressure-sensitive adhesive film used for a display panel of a product such as a smartphone, a tablet-type terminal, or a laptop computer, and more particularly a foldable display panel.
  • Patent Document 1 discloses a flexible electronic device that uses a flexible display layer, a flexible touch-sensitive layer, a flexible display cover layer, and the like, and discloses an electronic device that is resistant to damage caused by impact such as dropping. ing.
  • a display uses a pressure-sensitive adhesive layer for adhering a polarizing plate or a retardation plate used in a liquid crystal display to a base material or another optical member, and an adhesive film for adhering a liquid crystal panel and a polarizing plate.
  • Patent Document 2 discloses an adhesive layer that is used in a liquid crystal display or adheres a retardation plate to a base material or another optical member.
  • Patent Document 3 discloses an adhesive composition and an adhesive sheet for laminating an optical component such as a display and a surface protective sheet via an adhesive.
  • an object of the present invention is to solve the above-described problems of the prior art. Specifically, an object of the present invention is to provide an adhesive film having both weather resistance and bending resistance. More specifically, an object of the present invention is to provide a pressure-sensitive adhesive film having a folding resistance even at ⁇ 30 ° C. to 50 ° C., particularly a pressure-sensitive adhesive film used for a foldable display panel.
  • First layer a layer that adheres to the first object to be adhered,
  • the storage elastic modulus at ⁇ 20 ° C. is 10 8 to 10 4 Pa, preferably 10 8 to 10 5 Pa, more preferably 10 8 to 10 6 Pa, and the storage elastic modulus at 40 ° C. is 10 7 to 10 4 Pa.
  • Second layer a layer provided on the first layer and having a storage elastic modulus at ⁇ 20 ° C. to 40 ° C.
  • a third layer a layer that is provided on the second layer and adheres to the second object to be adhered, and has a storage elastic modulus at ⁇ 20 ° C. of 10 8 to 10 4 Pa, preferably Is 10 8 to 10 5 Pa, more preferably 10 8 to 10 6 Pa, and a storage modulus at 40 ° C. of 10 7 to 10 4 Pa, preferably 10 6 to 10 4 Pa;
  • a pressure-sensitive adhesive film comprising at least
  • First layer A layer that adheres to the first object to be adhered, and that has an adhesiveness measured at 23 ° C. by an adhesive test of JIS Z-0237 of 5 N / (25 mm) or more, preferably 8 to A layer that is 30 N / (25 mm), more preferably 8-25 N / (25 mm);
  • Second layer a layer provided on the first layer and having a storage elastic modulus at ⁇ 20 ° C. to 40 ° C. of 10 8 to 10 4 Pa, preferably 10 7 to 10 4 Pa, more preferably 10 6 to 10 A layer of 4 Pa; and a third layer: a layer which is provided on the second layer and adheres to the second object to be adhered, and is measured at 23 ° C.
  • a pressure-sensitive adhesive film comprising at least
  • the first layer has an adhesiveness measured at 23 ° C. by an adhesive test of JIS Z-0237 of 5 N / (25 mm) or more, preferably 8 to 30 N / (25 mm), more preferably Is 8 to 25 N / (25 mm),
  • the third layer has an adhesiveness measured at 23 ° C. by an adhesive test of JIS Z-0237 of 5 N / (25 mm) or more, preferably 8 to 30 N / (25 mm), more preferably 8 to 25 N / (25 mm). There should be.
  • an adhesive film having both weather resistance and bending resistance can be provided. More specifically, according to the present invention, it is possible to provide a pressure-sensitive adhesive film having a folding resistance even at ⁇ 30 ° C. to 50 ° C., particularly a pressure-sensitive adhesive film used for a foldable display panel.
  • FIG. It is the conceptual diagram of the adhesive film 1 of this invention, and the conceptual diagram of X when the 1st to-be-adhered object 6 and the 2nd to-be-adhered object 7 are adhere
  • FIG. It is a graph which shows the storage elastic modulus (vertical axis) accompanying the temperature change (horizontal axis) of the 1st layer and the 3rd layer which were used for Examples 1 and 2. It is a graph which shows the storage elastic modulus (vertical axis) accompanying the temperature change (horizontal axis) of the 2nd layer used for Examples 1 and 2.
  • the present application provides an adhesive film having at least three layers.
  • the at least three layers are roughly divided into two modes.
  • As a 1st aspect at least 3 layer consists of the 1st layer, the 2nd layer, and the 3rd layer which are explained in full detail below, and has the characteristic explained in full detail below.
  • the first layer is a layer that adheres to the first object to be adhered, and the storage elastic modulus at ⁇ 20 ° C. and 40 ° C. preferably has a desired value.
  • the first layer has a storage elastic modulus at ⁇ 20 ° C. of 10 8 to 10 4 Pa, preferably 10 8 to 10 5 Pa, more preferably 10 8 to 10 6 Pa.
  • the storage elastic modulus at 40 ° C. is 10 7 to 10 4 Pa, preferably 10 6 to 10 4 Pa.
  • the storage elastic modulus can be measured by a conventionally known technique, and is not particularly limited to the technique used and the apparatus used.
  • the storage elastic modulus can be measured by a shearing method, for example, a method based on JIS K 7244, and can be measured by a commercially available rheometer.
  • the 1st to-be-adhered target object may be the same as that of the below-mentioned 2nd to-be-adhered object, or may differ.
  • the adhesive film of this invention adheres as a 1st and / or 2nd to-be-adhered object,
  • a display panel of products such as a smart phone, a tablet-type terminal, a notebook computer, More specifically, Examples thereof include a foldable display panel and a polarizing plate.
  • the material which comprises a 1st layer will not be specifically limited if it has the said characteristic.
  • the first layer may be any material that has desired optical characteristics and has such characteristics. Examples of desired characteristics include, but are not limited to, transmittance and haze in the visible light region, as will be described later. Examples of the material constituting the first layer include, but are not limited to, an acrylic resin, a silicone resin, and a urethane resin.
  • the first layer has the above-mentioned characteristics, and thus has the desired adhesion and bending resistance with the first object to be adhered, and is peeled between the first object to be adhered even by repeated bending. No occurrence of floating.
  • the first layer also has desired adhesiveness and bending resistance in relation to the second layer described later, and peeling and floating between the second layer and the second layer are observed even after repeated bending. I can't.
  • the second layer is a layer provided on the first layer, and the storage elastic modulus at ⁇ 20 ° C. to 40 ° C. has a desired value. Note that another layer may be provided between the first layer and the second layer, but the second layer is preferably provided immediately above the first layer.
  • the storage elastic modulus may be 10 8 to 10 4 Pa, preferably 10 7 to 10 4 Pa, more preferably 10 6 to 10 4 Pa.
  • the material which comprises a 2nd layer will not be specifically limited if it has the said characteristic.
  • the second layer has a desired optical characteristic and may be a material provided with the characteristic. Examples of desired characteristics include, but are not limited to, transmittance and haze in the visible light region, as will be described later.
  • the material constituting the second layer include, but are not limited to, an acrylic resin, a silicone resin, and a urethane resin.
  • the material which comprises a 2nd layer is the same raw material as the material which comprises a 1st layer.
  • the first layer is made of a silicone resin
  • the second layer is preferably made of a silicone resin.
  • the first layer is made of urethane resin
  • the second layer is also preferably made of urethane resin.
  • the first layer is made of an acrylic resin
  • the second layer is preferably made of an acrylic resin.
  • the second layer has the above-mentioned characteristics, and thus has the desired adhesiveness and bending resistance with the first layer. Even when the second layer is repeatedly bent, the second layer does not peel off or float. Occurrence is not seen.
  • the second layer also has the desired adhesiveness and bending resistance in relation to the third layer described later, and peeling and floating between the second layer and the third layer are observed even after repeated bending. I can't.
  • the third layer is a layer that is provided on the second layer and adheres to the second object to be adhered, and the storage elastic modulus at ⁇ 20 ° C. and 40 ° C. preferably has a desired value.
  • another layer may be provided between the second layer and the third layer, but the third layer is preferably provided immediately above the second layer.
  • the third layer has a storage elastic modulus at ⁇ 20 ° C. of 10 8 to 10 4 Pa, preferably 10 8 to 10 5 Pa, more preferably 10 8 to 10 6 Pa.
  • the storage elastic modulus at 40 ° C. is 10 7 to 10 4 Pa, preferably 10 6 to 10 4 Pa.
  • the first layer and the third layer may be composed of compositions having the same characteristics.
  • the material which comprises a 3rd layer will not be specifically limited if it has the said characteristic.
  • the third layer may be any material that has desired optical characteristics and is provided with such characteristics. Examples of desired characteristics include, but are not limited to, transmittance and haze in the visible light region, as will be described later. Examples of the material constituting the third layer include, but are not limited to, the same materials as those constituting the first layer.
  • the material which comprises a 3rd layer is the same raw material as the material which comprises a 2nd layer.
  • the third layer is preferably made of a silicone resin.
  • the third layer is also preferably made of urethane resin.
  • the third layer is also preferably made of an acrylic resin.
  • the third layer has the above-mentioned characteristics, and thus has the desired adhesion and bending resistance with the second adherend object, and is peeled between the second adherend object even by repeated bending. No occurrence of floating. Further, as described above, the third layer has the desired adhesiveness and bending resistance with the second layer, and no peeling or floating occurs between the second layer and the second layer even after repeated bending. .
  • At least 3 layer consists of the 1st layer, the 2nd layer, and the 3rd layer which are explained in full detail below, and has the characteristic explained in full detail below.
  • the first layer is a layer that adheres to the first object to be adhered, and has an adhesion measured at 23 ° C. by an adhesion test of JIS Z-0237 of 5 N / (25 mm) or more, preferably 8 to 30 N / (25 mm), more preferably 8 to 25 N / (25 mm).
  • the adhesiveness can be measured at 23 ° C. by an adhesive test of JIS Z-0237, and is not limited to the apparatus used for the measurement.
  • the material which comprises a 1st layer will not be specifically limited if it has the said characteristic. Similarly to the first aspect, in the second aspect as well, it is particularly preferable if the first layer has a desired optical characteristic and is provided with the characteristic. Examples of the material constituting the first layer include, but are not limited to, the same materials as those exemplified as the material constituting the first layer in the first embodiment.
  • the first layer has the above-described characteristics, so that, in the same manner as in the first aspect, in the relationship with the first object to be adhered and in the relationship with the second layer, desired adhesiveness and bending resistance. Even if it is repeatedly bent, no peeling or floating occurs between the first object to be adhered or the second layer.
  • the second layer is a layer provided on the first layer, and the storage elastic modulus at ⁇ 20 ° C. to 40 ° C. has a desired value. Note that another layer may be provided between the first layer and the second layer, but the second layer is preferably provided immediately above the first layer.
  • the storage elastic modulus at ⁇ 20 ° C. to 40 ° C. is 10 8 to 10 4 Pa, preferably 10 7 to 10 4 Pa, more preferably 10 6 to 10 4 Pa.
  • the material which comprises a 2nd layer will not be specifically limited if it has the said characteristic.
  • Examples of the material constituting the second layer include, but are not limited to, the same materials as those exemplified as the material constituting the second layer in the first embodiment.
  • the second layer has the desired adhesiveness and bending resistance in the relationship with the first layer and in the relationship with the third layer, as in the first aspect. Even with repeated bending, no peeling or floating occurs between the first layer and the third layer.
  • the third layer is a layer that is provided on the second layer and adheres to the second object to be adhered, and has an adhesiveness measured at 23 ° C. by an adhesive test of JIS Z-0237 of 5 N / (25 mm).
  • the above is preferably 8 to 30 N / (25 mm), more preferably 8 to 25 N / (25 mm).
  • Other layers may be provided between the second layer and the third layer, but the third layer is preferably provided immediately above the second layer.
  • the first layer and the third layer may be composed of compositions having the same characteristics.
  • the material which comprises a 3rd layer will not be specifically limited if it has the said characteristic. Similarly to the first aspect, in the second aspect as well, it is particularly preferable if the third layer has a desired optical characteristic and is provided with the characteristic. Examples of the material constituting the third layer include, but are not limited to, the same materials as those exemplified as the material constituting the third layer in the first embodiment.
  • the third layer is provided with the above-described characteristics, so that, in the same manner as in the first aspect, in the relationship with the second object to be adhered and in the relationship with the second layer, desired adhesiveness and bending resistance. Even if it is bent repeatedly, no peeling or floating occurs between the second object to be adhered or the second layer.
  • the adhesive film of this application may have both the 1st aspect and the 2nd aspect. That is, the first layer preferably has the desired storage elastic modulus at ⁇ 20 ° C. and 40 ° C. in the first embodiment, and has the desired tackiness according to the tackiness test of JIS Z-0237.
  • the third layer preferably has a desired storage elastic modulus at ⁇ 20 ° C. and 40 ° C. in the first embodiment, and has a desired tackiness according to the tackiness test of JIS Z-0237.
  • the pressure-sensitive adhesive film having the first aspect and / or the second aspect of the present application has sufficient flexibility in the second layer, it can provide sufficient bending resistance.
  • sufficient weather resistance can be provided in the first layer and the third layer.
  • the first layer and the second layer have sufficient affinity, sufficient bending resistance and weather resistance can be provided, and the second layer and the third layer are sufficient. By providing affinity, sufficient bending resistance and weather resistance can be provided, and sufficient bending resistance and weather resistance can be provided as the entire adhesive film.
  • each layer constituting the pressure-sensitive adhesive film and / or the pressure-sensitive adhesive film itself may have desired optical characteristics.
  • the optical characteristics include, but are not limited to, transmittance, haze, refractive index, and color difference.
  • FIG. 1 is a conceptual diagram of an adhesive film 1 of the present invention.
  • the adhesive film in the conceptual diagram of FIG. 1 includes a first layer 2, a second layer 3, and a third layer 4.
  • a conceptual diagram of the case where the first adherend object 6 and the second adherend object 7 are adhered via the adhesive film 1 is shown below the arrow X.
  • the first layer 2 adheres to the first adherend object 6, and the third layer 4 adheres to the adherend object 7.
  • the pressure-sensitive adhesive film 1 of the present invention can exhibit the above-described effects.
  • the pressure-sensitive adhesive film of the present application can be produced using a conventionally known method regardless of whether it is the first aspect or the second aspect.
  • the adhesive film of this application can be obtained by preparing the board
  • a conventionally known method can be used for the lamination.
  • it may be coated using various coating techniques, or a film (film) separately may be laminated.
  • the obtained adhesive film can be used by being peeled off from the substrate.
  • An adhesive film X-1 comprising a first layer, a second layer provided on the first layer, and a third layer provided on the second layer was prepared by the following procedure.
  • Paint A in which 0.75 parts of catalyst (CAT-PL-50T made by Shin-Etsu Chemical Co., Ltd.) and 50 parts of toluene were added to 100 parts of addition type silicone adhesive (KR-3700 made by Shin-Etsu Chemical Co., Ltd.) and mixed uniformly. Prepared.
  • paint B was prepared by adding 0.6 parts of catalyst (CATA12070 made by Arakawa Chemical Co.) to 100 parts of addition type silicone adhesive (AS-OCA001 made by Arakawa Chemical Co., Ltd.) and mixing them uniformly. .
  • ⁇ Preparation of adhesive film X-1> Prepare a PET film (thickness: 50 ⁇ m), hang it on the PET film in the order of paint A, paint B, paint A, dry with hot air at 60 ° C. for 4 minutes, and then dry at 140 ° C. for 10 minutes. Membrane X-1 was formed.
  • the obtained film X-1 was cut with a cutter knife and the cross section was observed with a Keyence microscope.
  • the adhesive film X-1 was a first layer (average film thickness: 287 ⁇ m) formed from paint A in order from the PET film. ),
  • the second layer (average film thickness: 230 ⁇ m) formed from the paint B, the third layer (average film thickness: 177 ⁇ m) formed from the paint A, and the presence of each of the three layers is confirmed. did. Further, it was confirmed by visual observation that the adhesive film X-1 of this example was colorless and transparent.
  • FIGS. 2 and 3 show the storage elastic modulus (vertical axis) accompanying the temperature change (horizontal axis) for the first layer and the third layer.
  • FIG. 3 shows the storage elastic modulus (vertical axis) associated with the temperature change (horizontal axis) for the second layer.
  • First layer 4 ⁇ 10 7 Pa ( ⁇ 20 ° C.); 6 ⁇ 10 5 Pa (40 ° C.); Second layer: 10 5 Pa ( ⁇ 20 ° C. to 40 ° C.); Third layer: 4 ⁇ 10 7 Pa ( ⁇ 20 ° C.); 6 ⁇ 10 5 Pa (40 ° C.).
  • an adhesive film X-2 was prepared as follows. ⁇ Preparation of adhesive film X-2> Prepare a PET film (thickness: 50 ⁇ m), apply paint A on the PET film using an applicator (manufactured by Tester Sangyo Co., Ltd.) so that the dry film thickness is 30 ⁇ m, then dry and form from paint A The first layer was formed. Next, on the first layer formed from the coating material A, the coating material B is applied using an applicator (manufactured by Tester Sangyo Co., Ltd.) so that the dry film thickness is 50 ⁇ m, and then dried to form the second layer formed from the coating material B. Layers were formed.
  • the coating material A is applied using an applicator (manufactured by Tester Sangyo Co., Ltd.) so that the dry film thickness is 30 ⁇ m, and then dried to form a third layer formed from the coating material A. Layers were formed. On the third layer, a cover film made by Nippers was adhered and bonded. The obtained film X-2 was cut with a cutter knife and the cross section was observed in the same manner as in Example 1. As a result, the first layer formed from the paint A, the second layer formed from the paint B, and the first layer formed from the paint A It was confirmed that there were three layers and each of the three layers was present alone.
  • an applicator manufactured by Tester Sangyo Co., Ltd.
  • ⁇ Measurement of optical properties of adhesive film X-2> The optical properties of the pressure-sensitive adhesive film X-2 obtained above were measured. Specifically, haze and total light transmittance were measured. As a result, the haze was 0.44%; and the total light transmittance was 93.34%.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention concerne un film adhésif présentant à la fois une résistance aux intempéries et une résistance à la flexion. La présente invention concerne le film adhésif constitué d'au moins : une première couche ayant un module d'élasticité au stockage de 108 à 104 Pa à -20 °C et un module d'élasticité au stockage de 107 à 104 Pa à 40 °C, à coller à une première partie adhérée ; une seconde couche disposée sur la première couche, ayant un module d'élasticité au stockage de 108 à 104 Pa à -20 °C à 40 °C ; et une troisième couche disposée au-dessus de la seconde couche, ayant un module d'élasticité au stockage de 108 à 104 Pa à -20 °C et un module d'élasticité au stockage de 107 à 104 Pa à 40 °C, à coller à une seconde partie adhérée.
PCT/JP2017/018344 2017-05-16 2017-05-16 Film adhésif WO2018211586A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111534254A (zh) * 2019-02-07 2020-08-14 利诺士尖端材料有限公司 用于可折叠显示器的压敏粘合剂组合物
CN111534255A (zh) * 2019-02-07 2020-08-14 利诺士尖端材料有限公司 用于可折叠显示器的压敏粘合剂组合物

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JP2007328092A (ja) * 2006-06-07 2007-12-20 Bridgestone Corp 光学フィルタ、これを備えたディスプレイ及びプラズマディスプレイパネル
WO2009154138A1 (fr) * 2008-06-18 2009-12-23 株式会社ブリヂストン Composition d'adhésif et procédé de fabrication de dalle d'écran l'utilisant
WO2010044467A1 (fr) * 2008-10-17 2010-04-22 日東電工株式会社 Feuille adhésive transparente pour dispositif d'affichage à écran plat et dispositif d'affichage à écran plan
JP2011194813A (ja) * 2010-03-23 2011-10-06 Lintec Corp 平面板貼合用樹脂積層体及び積層平面板
WO2011129200A1 (fr) * 2010-04-13 2011-10-20 三菱樹脂株式会社 Feuille adhésive double face transparente
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JP2017075281A (ja) * 2015-10-16 2017-04-20 リンテック株式会社 粘着シートおよび表示体
JP2017082169A (ja) * 2015-10-30 2017-05-18 岩谷産業株式会社 粘着フィルム
JP2017095660A (ja) * 2015-11-27 2017-06-01 三星エスディアイ株式会社Ｓａｍｓｕｎｇ ＳＤＩ Ｃｏ． 粘着剤組成物、その製造方法、粘着シートおよび画像表示装置
JP2017119801A (ja) * 2015-12-29 2017-07-06 三星エスディアイ株式会社Ｓａｍｓｕｎｇ ＳＤＩ Ｃｏ． 粘着剤組成物および粘着シート
JP2017126061A (ja) * 2016-01-11 2017-07-20 三星ディスプレイ株式會社Ｓａｍｓｕｎｇ Ｄｉｓｐｌａｙ Ｃｏ．，Ｌｔｄ． フォルダブル表示装置

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CN111534254A (zh) * 2019-02-07 2020-08-14 利诺士尖端材料有限公司 用于可折叠显示器的压敏粘合剂组合物
CN111534255A (zh) * 2019-02-07 2020-08-14 利诺士尖端材料有限公司 用于可折叠显示器的压敏粘合剂组合物
US11066581B2 (en) 2019-02-07 2021-07-20 Innox Advanced Materials Co., Ltd. Pressure-sensitive adhesive composition for foldable display
US11066580B2 (en) 2019-02-07 2021-07-20 Innox Advanced Materials Co., Ltd. Pressure-sensitive adhesive composition for foldable display
CN111534254B (zh) * 2019-02-07 2022-03-01 利诺士尖端材料有限公司 用于可折叠显示器的压敏粘合剂组合物
CN111534255B (zh) * 2019-02-07 2022-03-01 利诺士尖端材料有限公司 用于可折叠显示器的压敏粘合剂组合物

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