JP5477417B2 - Resin composition and image display device - Google Patents

Resin composition and image display device Download PDF

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JP5477417B2
JP5477417B2 JP2012105372A JP2012105372A JP5477417B2 JP 5477417 B2 JP5477417 B2 JP 5477417B2 JP 2012105372 A JP2012105372 A JP 2012105372A JP 2012105372 A JP2012105372 A JP 2012105372A JP 5477417 B2 JP5477417 B2 JP 5477417B2
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image display
resin composition
resin
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JP2012212143A (en
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倫由紀 豊田
由久 新家
勇介 鎌田
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Dexerials Corp
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308Support structures for LCD panels, e.g. frames or bezels
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133311Environmental protection, e.g. against dust or humidity
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133331Cover glasses
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/02Materials and properties organic material
    • G02F2202/022Materials and properties organic material polymeric
    • G02F2202/023Materials and properties organic material polymeric curable
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/02Materials and properties organic material
    • G02F2202/022Materials and properties organic material polymeric
    • G02F2202/023Materials and properties organic material polymeric curable
    • G02F2202/025Materials and properties organic material polymeric curable thermocurable
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/28Adhesive materials or arrangements
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/11Methods of delaminating, per se; i.e., separating at bonding face
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/11Methods of delaminating, per se; i.e., separating at bonding face
    • Y10T156/1168Gripping and pulling work apart during delaminating
    • Y10T156/1179Gripping and pulling work apart during delaminating with poking during delaminating [e.g., jabbing, etc.]
    • Y10T156/1184Piercing layer during delaminating [e.g., cutting, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Description

本発明は、例えば携帯電話等に用いられる液晶表示装置(LCD)等の画像表示装置に関し、特に、画像表示部上に透明な保護部を設け、画像表示部と保護部との間に樹脂硬化物を介在させた画像表示装置に関する。   The present invention relates to an image display device such as a liquid crystal display device (LCD) used for a mobile phone, for example, and in particular, a transparent protective portion is provided on the image display portion, and resin curing is provided between the image display portion and the protective portion. The present invention relates to an image display device having an object interposed therebetween.

従来、この種の表示装置としては、例えば図4に示すような液晶表示装置101が知られている。この液晶表示装置101は、画像表示部である液晶表示パネル102上に、例えば、ガラスやプラスチックスからなる透明な保護部103が設けられている。   Conventionally, as this type of display device, for example, a liquid crystal display device 101 as shown in FIG. 4 is known. In the liquid crystal display device 101, a transparent protection unit 103 made of, for example, glass or plastic is provided on a liquid crystal display panel 102 that is an image display unit.

この場合、液晶表示パネル102表面及び偏光板(図示せず)を保護するため、保護部103との間にスペーサ104を介在させることによって液晶表示パネル102と保護部103との間に空隙105が設けられている。   In this case, in order to protect the surface of the liquid crystal display panel 102 and the polarizing plate (not shown), a gap 104 is provided between the liquid crystal display panel 102 and the protective part 103 by interposing a spacer 104 between the protective part 103. Is provided.

しかし、液晶表示パネル102と保護部103との間の空隙105の存在により、光の散乱が起き、それに起因してコントラストや輝度が低下し、また、空隙105の存在は表示装置の薄型化の妨げとなる。   However, the presence of the gap 105 between the liquid crystal display panel 102 and the protection unit 103 causes light scattering, resulting in a decrease in contrast and brightness. Hinder.

このような問題に鑑み、液晶表示パネルと保護部との間の空隙に可視光透過率の高い樹脂を充填することが提案されている(特許文献1)。   In view of such a problem, it has been proposed to fill a gap between the liquid crystal display panel and the protective portion with a resin having a high visible light transmittance (Patent Document 1).

特開2005−55641号公報JP 2005-55641 A

しかしながら、充填した樹脂の硬化収縮の際に樹脂硬化物に生ずる内部応力によって、あるいは、環境温度の変動により保護部に反りが生じた場合に樹脂硬化物を介して液晶パネルに加わる外部応力によって、液晶表示パネルの液晶を挟持する光学ガラス板に変形が生じ、液晶セルギャップの面内均一性が失われ、また、液晶材料の配向が乱れ、その結果、表示ムラ等の表示不良が生ずる可能性が増大する。特に、保護部103としてガラス板よりも薄く形成できる樹脂板を使用した場合には、環境温度変化による反りの影響が大きくなり、セルギャップの面内均一性がより損なわれ、表示ムラが強まることが懸念される。それだけでなく、保護部103のプラスチック板が過度に反った場合、プラスチック板と液晶表示パネルとの間の樹脂硬化物がプラスチック板の反りに追随できずに、プラスチック板から剥離してしまうことも懸念される。   However, due to internal stress generated in the cured resin during curing shrinkage of the filled resin, or due to external stress applied to the liquid crystal panel via the cured resin when the protective part warps due to environmental temperature fluctuations, The optical glass plate that sandwiches the liquid crystal of the liquid crystal display panel is deformed, the in-plane uniformity of the liquid crystal cell gap is lost, and the orientation of the liquid crystal material is disturbed, resulting in display defects such as display unevenness. Will increase. In particular, when a resin plate that can be formed thinner than a glass plate is used as the protective portion 103, the influence of warpage due to environmental temperature changes is increased, the in-plane uniformity of the cell gap is further impaired, and display unevenness is increased. Is concerned. In addition, if the plastic plate of the protection unit 103 is excessively warped, the cured resin between the plastic plate and the liquid crystal display panel may not follow the warp of the plastic plate and may peel off from the plastic plate. Concerned.

本発明は、従来の技術の課題を解決しようとするものであり、保護部と画像表示部との間の樹脂組成物の硬化収縮により生ずる内部応力や、保護部の反りによって画像表示部に加わる外部応力によって生ずる表示ムラと樹脂硬化物の剥離とが抑制された画像表示装置、並びにそのような樹脂硬化物を与える樹脂組成物を提供することである。   The present invention is intended to solve the problems of the prior art, and is applied to the image display unit due to internal stress generated by curing shrinkage of the resin composition between the protection unit and the image display unit, or warping of the protection unit. An object of the present invention is to provide an image display device in which display unevenness caused by external stress and peeling of a cured resin are suppressed, and a resin composition that provides such a cured resin.

本発明者らは、画像表示部と保護部との間の空隙に充填され硬化した樹脂硬化物について、その伸び率と保護部に対する密着力とを調整することにより上述の目的を達成できることを見出し、本発明の画像表示装置を完成させた。また、樹脂硬化物の硬化前の樹脂組成物については、それが硬化する際に蓄積される内部応力が、硬化後の伸び率と保護部に対する密着力とを規定することにより調整できることに鑑み、画像表示部と保護部との間に充填するための本発明の樹脂組成物を完成させた。   The present inventors have found that the above-mentioned object can be achieved by adjusting the elongation percentage and the adhesion to the protective part of the cured resin filled in the gap between the image display part and the protective part and cured. The image display device of the present invention was completed. In addition, for the resin composition before curing of the cured resin, the internal stress accumulated when it is cured can be adjusted by defining the elongation after curing and the adhesion to the protective part, The resin composition of this invention for filling between an image display part and a protection part was completed.

即ち、本発明は、画像表示部と、該画像表示部上に配置された透光性の保護部とを有する画像表示装置であって、
画像表示部と保護部との間に樹脂硬化物層が介在し、
樹脂硬化物層は、可視光領域の透過率が90%以上、伸び率が25℃で700%以上且つ80℃で400%以上、及び保護部に対する密着力が25℃で0.4N/cm以上且つ80℃で0.3N/cm以上である画像表示装置を提供する。
That is, the present invention is an image display device having an image display unit and a translucent protection unit disposed on the image display unit,
A cured resin layer is interposed between the image display part and the protective part,
The cured resin layer has a transmittance in the visible light region of 90% or more, an elongation of 700% or more at 25 ° C. and 400% or more at 80 ° C., and an adhesion to the protective part of 0.4 N / cm or more at 25 ° C. An image display device having 0.3 N / cm or more at 80 ° C. is provided.

また、本発明は、画像表示装置の画像表示部と、透光性の保護部との間に介在させる樹脂硬化物層を形成するための樹脂組成物であって、それを硬化させた樹脂硬化物の可視光領域の透過率が厚さ100μmの場合に90%以上、伸び率が25℃で700%以上且つ80℃で400%以上、及びアクリル樹脂板に対する密着力が25℃で0.4N/cm以上且つ80℃で0.3N/cm以上である樹脂組成物を提供する。   The present invention also provides a resin composition for forming a cured resin layer interposed between an image display portion of an image display device and a translucent protective portion, and a cured resin obtained by curing the resin composition. 90% or more when the transmittance in the visible light region of the object is 100 μm thick, the elongation is 700% or more at 25 ° C. and 400% or more at 80 ° C., and the adhesion to the acrylic resin plate is 0.4 N at 25 ° C. / Cm or more and the resin composition which is 0.3 N / cm or more at 80 degreeC.

さらに、本発明は、画像表示装置の画像表示部と、透光性の保護部との間に介在する樹脂硬化物層であって、その可視光領域の透過率が90%以上、伸び率が25℃で700%以上且つ80℃で400%以上、及びアクリル樹脂板に対する密着力が25℃で0.4N/cm以上且つ80℃で0.3N/cm以上である樹脂硬化物層を提供する。   Furthermore, the present invention is a cured resin layer interposed between an image display unit of an image display device and a translucent protective unit, and has a visible light region transmittance of 90% or more and an elongation rate. Provided is a cured resin layer having 700% or more at 25 ° C., 400% or more at 80 ° C., and an adhesive strength to an acrylic resin plate of 0.4 N / cm or more at 25 ° C. and 0.3 N / cm or more at 80 ° C. .

本発明の画像表示装置によれば、画像表示部と保護部との間に存在する樹脂硬化物として特定の数値以上の伸び率と保護部に対する密着力とを有するものを使用するので、樹脂硬化物の硬化収縮により生ずる内部応力を軽減し、樹脂硬化物を保護部の反りに追随させることができるので、表示不良や樹脂硬化物の保護部からの剥離を大きく抑制することができる。   According to the image display device of the present invention, since the resin cured product existing between the image display unit and the protection unit is used as the resin cured product having an elongation percentage equal to or higher than a specific value and adhesion to the protection unit, the resin curing Since the internal stress caused by the curing shrinkage of the product can be reduced and the cured resin can be caused to follow the warp of the protective part, display failure and peeling of the cured resin from the protective part can be greatly suppressed.

また、本発明の樹脂組成物によれば、その硬化物の伸び率と保護部に対する密着力とを特定の数値以上に規定し、更に好ましい態様として硬化収縮率を測定の数値以下に規定しているので、画像表示部と保護部との間に充填して硬化させた場合に、その硬化収縮により生ずる内部応力が軽減され、また、その硬化物を保護部の反りに追随させることができ、表示不良や樹脂硬化物の保護部からの剥離を大きく抑制することができる。また、本発明の樹脂組成物の屈折率を、従来の液晶表示パネルと保護部との間に設けられていた空隙に比して画像表示部の構成パネルや保護部の構成パネルの屈折率に近く数値に調整することができる。これは、成分の選択や量の調整により行うことができる。そのような場合、保護部と樹脂硬化物との界面や樹脂硬化物と画像表示部との界面での光の反射を抑制することができる。その結果、本発明の画像表示装置によれば、表示不良のない高輝度及び高コントラスト表示が可能になる。   Moreover, according to the resin composition of the present invention, the elongation percentage of the cured product and the adhesion to the protective part are specified to be more than a specific numerical value, and as a more preferable aspect, the curing shrinkage rate is specified to be a numerical value of measurement or less. Therefore, when filled between the image display part and the protective part and cured, the internal stress caused by the curing shrinkage is reduced, and the cured product can follow the warp of the protective part, Display defects and peeling of the cured resin from the protective part can be greatly suppressed. Further, the refractive index of the resin composition of the present invention is set to the refractive index of the component panel of the image display unit and the component panel of the protective unit as compared to the gap provided between the conventional liquid crystal display panel and the protective unit. It can be adjusted to a numerical value nearby. This can be done by selecting components and adjusting the amount. In such a case, reflection of light at the interface between the protective part and the cured resin product or at the interface between the cured resin product and the image display unit can be suppressed. As a result, according to the image display apparatus of the present invention, high luminance and high contrast display without display defects becomes possible.

特に、画像表示部が液晶表示パネルである場合には、液晶材料の配向乱れ等の表示不良を確実に防止して高品位の表示を行うことができる。   In particular, when the image display unit is a liquid crystal display panel, display defects such as disorder of alignment of the liquid crystal material can be reliably prevented and high quality display can be performed.

さらに、本発明の画像表示装置によれば、画像表示部と保護部との間に樹脂硬化物が介在するので、衝撃に強くなる。   Furthermore, according to the image display device of the present invention, since the cured resin is interposed between the image display unit and the protection unit, the image display device is resistant to impact.

加えて、本発明の画像表示装置によれば、画像表示部と保護部との間に空隙を設けていた従来例に比して薄型の画像表示装置となる。   In addition, according to the image display device of the present invention, the image display device is thinner than the conventional example in which a gap is provided between the image display unit and the protection unit.

本発明に係る表示装置の実施形態の要部を示す断面図である。It is sectional drawing which shows the principal part of embodiment of the display apparatus which concerns on this invention. 本発明に係る表示装置の実施形態の要部を示す断面図である。It is sectional drawing which shows the principal part of embodiment of the display apparatus which concerns on this invention. 本発明に係る表示装置の実施形態の要部を示す断面図である。It is sectional drawing which shows the principal part of embodiment of the display apparatus which concerns on this invention. 従来技術に係る表示装置の要部を示す断面図である。It is sectional drawing which shows the principal part of the display apparatus which concerns on a prior art.

以下、本発明の好ましい実施の形態を図面を参照して詳細に説明する。なお、各図中、同一符号は同一又は同等の構成要素を表している。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same numerals indicate the same or equivalent components.

図1及び図2は、本発明に係る画像表示装置の一実施形態の要部を示す断面図である。   1 and 2 are cross-sectional views showing the main parts of an embodiment of an image display device according to the present invention.

図1に示すように、本実施形態の表示装置1は、図示しない駆動回路に接続され所定の画像表示を行う画像表示部2と、この画像表示部2に所定の距離をおいて近接対向配置された透光性の保護部3とを有している。   As shown in FIG. 1, a display device 1 according to this embodiment includes an image display unit 2 that is connected to a drive circuit (not shown) and displays a predetermined image, and is disposed in close proximity to the image display unit 2 at a predetermined distance. The translucent protective part 3 is provided.

画像表示装置1において画像表示部2としては、特に限定されず、例えば、画像表示装置1が液晶表示装置である場合には液晶表示パネルであり、プラズマ表示装置であれば、プラズマパネルであり、有機EL表示装置であれば、有機ELシートである。また、画像表示部2の表面素材としては、光学ガラスやプラスチック(アクリル樹脂等)を好適に用いることができる。   The image display unit 2 in the image display device 1 is not particularly limited. For example, when the image display device 1 is a liquid crystal display device, it is a liquid crystal display panel, and when it is a plasma display device, it is a plasma panel. If it is an organic EL display device, it is an organic EL sheet. Moreover, as the surface material of the image display part 2, optical glass and plastics (acrylic resin etc.) can be used suitably.

ここで、液晶表示装置としては、特に限定されるものではなく、種々のものに適用することができる。このような液晶表示装置としては、例えば、携帯電話、携帯ゲーム機器等の電子機器があげられる。   Here, the liquid crystal display device is not particularly limited, and can be applied to various types. Examples of such a liquid crystal display device include electronic devices such as a mobile phone and a mobile game device.

なお、画像表示部2が液晶表示パネルである場合には、図2に示すように、その表側面に偏光板6、7が設けられている。   In addition, when the image display part 2 is a liquid crystal display panel, as shown in FIG. 2, the polarizing plates 6 and 7 are provided in the front side surface.

保護部3は、画像表示部2と同程度の大きさの板状、シート状又はフィルム状の部材からなるもので、その部材として、例えば、光学ガラスやプラスチック(ポリメチルメタクリレート(PMMA)などのアクリル樹脂、ポリカーボネート等)を好適に用いることができる。保護部3の表面もしくは裏面には、反射防止膜、遮光膜、視野角制御膜等の光学層を形成してもよい。特に、本発明では、保護部3として、アクリル樹脂板、中でもPMMA板を使用した場合に発明の効果が顕著となる。   The protection unit 3 is composed of a plate-like, sheet-like, or film-like member having the same size as that of the image display unit 2, and examples of the member include optical glass and plastic (polymethyl methacrylate (PMMA)). Acrylic resin, polycarbonate, etc.) can be suitably used. An optical layer such as an antireflection film, a light shielding film, or a viewing angle control film may be formed on the front surface or the back surface of the protection unit 3. In particular, in the present invention, when an acrylic resin plate, particularly a PMMA plate, is used as the protective portion 3, the effect of the invention becomes remarkable.

保護部3は、画像表示部2の周縁部に設けられたスペーサ4を介して画像表示部2上に設けられている。このスペーサ4の厚さは0.05〜1.5mm程度であり、これにより画像表示部2と保護部3との表面間距離が1mm程度に保持されるようになっている。   The protection unit 3 is provided on the image display unit 2 via a spacer 4 provided on the peripheral edge of the image display unit 2. The spacer 4 has a thickness of about 0.05 to 1.5 mm, so that the distance between the surfaces of the image display unit 2 and the protection unit 3 is maintained at about 1 mm.

画像表示装置1には、画像表示部2と保護部3との間に、樹脂硬化物層5が設けられている。   In the image display device 1, a cured resin layer 5 is provided between the image display unit 2 and the protection unit 3.

この樹脂硬化物層5は、可視光領域の透過率が90%以上、伸び率が25℃で700%以上且つ80℃で400%以上、好ましくは25℃で800%以上且つ80℃で500%以上、及び保護部3に対する密着力が25℃で0.4N/cm以上且つ80℃で0.3N/cm以上、好ましくは25℃で0.5N/cm以上且つ80℃で0.4N/cm以上である。   The cured resin layer 5 has a visible light transmittance of 90% or more, an elongation of 700% or more at 25 ° C. and 400% or more at 80 ° C., preferably 800% or more at 25 ° C. and 500% at 80 ° C. The adhesion strength to the protective part 3 is 0.4 N / cm or more at 25 ° C. and 0.3 N / cm or more at 80 ° C., preferably 0.5 N / cm or more at 25 ° C. and 0.4 N / cm at 80 ° C. That's it.

可視光領域の透過率を90%以上とした理由は、90%未満とすると変色の発生や透明性の低下が実用上無視できないからである。ここで、透過率は、画像表示置1においては、樹脂硬化物層5の厚みに関わりなく90%以上であることが要請されている。即ち、樹脂硬化物層5が同じ素材から形成されていても、例えば100μm厚では90%以上であるが、1mm厚では70%となる場合、1mmの厚みの樹脂硬化物層5は本発明の画像表示装置1には適用できないことになるが、その場合であっても100μm厚では適用可能となる。   The reason why the transmittance in the visible light region is 90% or more is that if it is less than 90%, the occurrence of discoloration and the decrease in transparency cannot be ignored in practice. Here, in the image display device 1, the transmittance is required to be 90% or more regardless of the thickness of the cured resin layer 5. That is, even if the cured resin layer 5 is formed of the same material, for example, when the thickness is 100 μm, it is 90% or more, but when the thickness is 1 mm, the cured resin layer 5 having a thickness of 1 mm Although it cannot be applied to the image display device 1, even in that case, it can be applied at a thickness of 100 μm.

また、伸び率及び密着性を規定する温度として25℃と80℃とを選択した理由は、画像表示装置の通常の使用環境が25℃であり、製造工程において樹脂組成物に紫外線照射すると約80℃程度まで温度が上昇するからであり、また、80℃前後から保護部を構成するアクリル樹脂、例えばPMMAの反り急激に大きくなるからである。ここで、伸び率は、樹脂組成物を所定の厚さになるように剥離フィルム上に滴下し、ついて紫外線照射して硬化させ、所定の大きさ(例えば、0.6mm厚、10mm幅、25mm長)にカットして試料を作成し、それを引っ張り試験機(テンシロン、オリエンテック社)で測定した値である。その条件は、雰囲気温度25℃又は80℃、加重5Kgf、引っ張り速度5mm/分、伸び率(%)=L/L×100で算出する。ここで、Lは基準長さ、Lは破断するまでの変位長さである。 Also, the reason why 25 ° C. and 80 ° C. are selected as the temperatures that define the elongation and adhesion is that the normal use environment of the image display device is 25 ° C., and about 80 when the resin composition is irradiated with ultraviolet rays in the manufacturing process. This is because the temperature rises to about 0 ° C., and the warpage of an acrylic resin, such as PMMA, that constitutes the protective portion increases rapidly from around 80 ° C. Here, the elongation ratio is determined by dropping the resin composition onto the release film so as to have a predetermined thickness, and then curing the resin composition by irradiating with an ultraviolet ray to a predetermined size (for example, 0.6 mm thickness, 10 mm width, 25 mm). This is a value measured by a tensile tester (Tensilon, Orientec Co., Ltd.). The conditions are calculated as follows: atmospheric temperature 25 ° C. or 80 ° C., load 5 kgf, pulling speed 5 mm / min, elongation (%) = L / L 0 × 100. Here, L 0 is a reference length, and L is a displacement length until fracture.

更に、伸び率を25℃で700%以上とした理由は、700%未満とすると反りに追随できないからであり、80℃で400%以上とした理由も、400%未満とする反りに追随できないからである。   Furthermore, the reason why the elongation rate is set to 700% or more at 25 ° C. is that it is impossible to follow the warp when it is less than 700%, and the reason why the elongation rate is set to 400% or more at 80 ° C. is not possible to follow the warp that is less than 400%. It is.

また、保護部3に対する密着力を25℃で0.4N/cm以上とした理由は、0.4N/cm未満とすると樹脂硬化時のUV照射による発熱に起因するPMMA反りに追随できず剥離するからであり、80℃で0.3N/cm以上とした理由は、0.3N/cm未満とするとモバイル機器の耐湿環境温度での反りに追随できず、剥離するからである。なお、密着力はJIS K6854−1に準拠して測定したものである。   The reason why the adhesion to the protective part 3 is 0.4 N / cm or more at 25 ° C. is that if it is less than 0.4 N / cm, the PMMA warp caused by the heat generated by UV irradiation at the time of resin curing cannot be followed and peeled off. The reason why it is set to 0.3 N / cm or more at 80 ° C. is that if it is less than 0.3 N / cm, it cannot follow the warp of the mobile device at the moisture-resistant environment temperature and peels off. In addition, adhesive force is measured based on JISK6854-1.

また、樹脂硬化物層5として、25℃における貯蔵弾性率に着目することが好ましい。これは、貯蔵弾性率が樹脂硬化物の硬化時の残留応力に起因するからである。具体的には25℃における貯蔵弾性率が高すぎると残留応力が大きくなり液晶に表示ムラが発生するので、好ましくは1×10Pa以下、より好ましくは1×10〜1×10Paである。特に、1×10〜1×10Paである。 Moreover, it is preferable to pay attention to the storage elastic modulus at 25 ° C. as the cured resin layer 5. This is because the storage elastic modulus is caused by the residual stress when the resin cured product is cured. Specifically, if the storage elastic modulus at 25 ° C. is too high, the residual stress increases and display unevenness occurs in the liquid crystal. Therefore, it is preferably 1 × 10 6 Pa or less, more preferably 1 × 10 3 to 1 × 10 6 Pa. It is. In particular, it is 1 × 10 3 to 1 × 10 5 Pa.

なお、樹脂硬化物層5の屈折率については、画像表示部2や保護部3の素材との関係で決定することになるが、樹脂硬化物層5側の画像表示部2の表面がガラス板で保護部3の表面がポリメチルメタクリレートなどのアクリル樹脂板である場合には、好ましくは1.51〜1.52である。   The refractive index of the cured resin layer 5 is determined by the relationship with the material of the image display unit 2 and the protection unit 3, but the surface of the image display unit 2 on the cured resin layer 5 side is a glass plate. When the surface of the protective part 3 is an acrylic resin plate such as polymethylmethacrylate, it is preferably 1.51 to 1.52.

なお、本発明を構成する樹脂硬化物層5は、以上説明したような特性を示す樹脂組成物から形成する。このような樹脂組成物については後述する。   In addition, the resin cured material layer 5 which comprises this invention is formed from the resin composition which shows the characteristic as demonstrated above. Such a resin composition will be described later.

本発明の画像表示装置においては、図1及び図2に示した実施形態の表示装置1のようにスペーサ4を設けることなく、図3に示す表示装置1Bのように、画像表示部2上に、上述した樹脂硬化物層5を与える樹脂組成物を成膜し、更に保護部3を積層し、樹脂組成物を硬化させることにより、スペーサを省略することが好ましい。その場合、画像表示部2と保護部3との距離(即ち、樹脂硬化物層5の厚さ)は樹脂組成物の粘度、密度、保護部3の重さ等に応じて定まるが、通常50〜250μmとすることができ、これにより、画像表示装置の薄型化を図ることができる。   In the image display device of the present invention, the spacer 4 is not provided as in the display device 1 of the embodiment shown in FIG. 1 and FIG. 2, but on the image display unit 2 as in the display device 1 </ b> B shown in FIG. 3. It is preferable to omit the spacer by forming a resin composition that gives the cured resin layer 5 described above, further laminating the protective part 3 and curing the resin composition. In this case, the distance between the image display unit 2 and the protection unit 3 (that is, the thickness of the cured resin layer 5) is determined according to the viscosity and density of the resin composition, the weight of the protection unit 3, etc. The thickness of the image display device can be reduced.

本発明の画像表示装置1を作製する場合には、例えば、画像表示部2上の周縁部に、スペーサ4と図示しない突堤部を設け、これらの内側の領域に樹脂組成物を所定量滴下する。   When producing the image display device 1 of the present invention, for example, the spacer 4 and a jetty not shown are provided on the peripheral edge on the image display unit 2, and a predetermined amount of the resin composition is dropped onto these inner regions. .

そして、画像表示部2のスペーサ4上に保護部3を配置し、画像表示部2と保護部3との間に樹脂組成物を隙間なく充填する。   And the protection part 3 is arrange | positioned on the spacer 4 of the image display part 2, and it fills with a resin composition between the image display part 2 and the protection part 3 without gap.

その後、保護部3を介して樹脂組成物に対して硬化させる熱あるいはエネルギー線(好ましくは紫外線)を照射することにより、樹脂組成物を硬化させる。これにより、目的とする画像表示装置1を得る。   Thereafter, the resin composition is cured by irradiating the resin composition with heat or energy rays (preferably ultraviolet rays) via the protective part 3. Thereby, the target image display apparatus 1 is obtained.

また、図3に示すようにスペーサ4を省略した画像表示装置1Bを作製する場合には、画像表示部2上に上述した樹脂組成物を塗布し、その上に保護部3を重ね、保護部3側から加熱あるいはエネルギー線(例えば紫外線)を照射すればよい。   Further, when the image display device 1B in which the spacer 4 is omitted as shown in FIG. 3 is manufactured, the above-described resin composition is applied on the image display unit 2, and the protection unit 3 is overlaid on the resin composition. Heating or energy rays (for example, ultraviolet rays) may be irradiated from the 3 side.

こうして得られる本発明の画像表示装置1、1Bによれば、画像表示部2及び保護部3に対し樹脂硬化収縮時の応力、環境温度による保護部3の反りによる外部応力の影響を最小限に抑えることができるので、画像表示部2及び保護部3において歪みがほとんど発生せず、その結果、製造の際に画像表示部2に変形が発生しないので、表示不良のない高輝度及び高コントラスト表示が可能になる。   According to the image display devices 1 and 1B of the present invention thus obtained, the stress at the time of resin curing shrinkage on the image display unit 2 and the protection unit 3 and the influence of external stress due to the warp of the protection unit 3 due to the environmental temperature are minimized. Therefore, the image display unit 2 and the protection unit 3 are hardly distorted. As a result, the image display unit 2 is not deformed at the time of manufacture. Is possible.

さらに、本実施の形態によれば、画像表示部2と保護部3との間に樹脂硬化物5が充填されているので、衝撃に強く、より薄型の表示装置1を提供することができる。   Further, according to the present embodiment, since the cured resin 5 is filled between the image display unit 2 and the protection unit 3, it is possible to provide a thinner display device 1 that is resistant to impact.

特に、画像表示部2が液晶表示パネルである揚合には、液晶材料の配向乱れ等の表示不良を確実に防止して高品位の表示を行う液晶表示装置を提供することができる。   In particular, when the image display unit 2 is a liquid crystal display panel, it is possible to provide a liquid crystal display device that reliably prevents display defects such as alignment disorder of the liquid crystal material and performs high-quality display.

なお、本発明は、上述した液晶表示装置に好適に適用することができるが、これに限らず、例えば、有機EL装置、プラズマディスプレイ装置等の種々のパネルディスプレイに適用することができる。   The present invention can be suitably applied to the above-described liquid crystal display device, but is not limited thereto, and can be applied to various panel displays such as an organic EL device and a plasma display device.

次に、本発明の画像表示装置1を構成する樹脂硬化物層5は、既に説明した特性を与えることのできる樹脂組成物から形成される。その硬化は、熱硬化型でもエネルギー線(可視光、紫外線等の光、電子線等)硬化型でもよいが、生産性向上の観点からは、光硬化型であることが好ましい。   Next, the cured resin layer 5 constituting the image display device 1 of the present invention is formed from a resin composition that can give the characteristics already described. The curing may be either a thermosetting type or an energy ray (light such as visible light or ultraviolet light, an electron beam) curable type, but from the viewpoint of improving productivity, a photocurable type is preferable.

即ち、本発明の樹脂組成物は、画像表示装置の画像表示部と、透光性の保護部との間に介在させる樹脂硬化物層を形成するための樹脂組成物であって、それを硬化させた樹脂硬化物の可視光領域の透過率が厚さ100μmの場合に90%以上、伸び率が25℃で700%以上且つ80℃で400%以上、及びアクリル樹脂板に対する密着力が25℃で0.4N/cm以上且つ80℃で0.3N/cm以上である樹脂組成物である。   That is, the resin composition of the present invention is a resin composition for forming a cured resin layer interposed between an image display portion of an image display device and a translucent protective portion, and cures the resin composition. When the transmittance of the visible light region of the cured resin is 100 μm, the elongation is 90% or more, the elongation is 700% or more at 25 ° C. and 400% or more at 80 ° C., and the adhesion to the acrylic resin plate is 25 ° C. 0.4 N / cm or more at 80 ° C. and 0.3 N / cm or more at 80 ° C.

本発明の樹脂組成物は、可視光領域の透過率に関し、それを硬化させた樹脂硬化物の厚さが100μmの場合に90%以上必要である。90%未満とすると変色の発生や透明性の低下が実用上無視できないからである。また、それを硬化させた樹脂硬化物の伸び率及びアクリル樹脂板に対する密着力については、本発明の画像表示装置1の樹脂硬化物層5について記述した内容を適用することができる。   The resin composition of the present invention requires 90% or more when the thickness of the cured resin obtained by curing the resin composition is 100 μm with respect to the transmittance in the visible light region. This is because if it is less than 90%, the occurrence of discoloration and a decrease in transparency cannot be ignored in practice. Moreover, the content described about the resin cured material layer 5 of the image display apparatus 1 of this invention is applicable about the elongation rate of the resin cured material which hardened it, and the adhesive force with respect to an acrylic resin board.

また、本発明の樹脂組成物は、硬化収縮率が好ましくは5%以下、より好ましくは4%以下、特に好ましくは3%以下、さらに好ましくは2.5%以下となるように調製したものである。そのため、樹脂組成物が硬化する際に樹脂硬化物に蓄積される内部応力を低減させることができ、樹脂硬化物層5と画像表示部2又は保護部3との界面に歪みができることを防止できる。ここで、硬化収縮率はJIS K6901(5.12項)の体積収縮率に準ずるものである。   The resin composition of the present invention is prepared so that the curing shrinkage is preferably 5% or less, more preferably 4% or less, particularly preferably 3% or less, and further preferably 2.5% or less. is there. Therefore, the internal stress accumulated in the cured resin can be reduced when the resin composition is cured, and the interface between the cured resin layer 5 and the image display unit 2 or the protection unit 3 can be prevented from being distorted. . Here, the curing shrinkage is in accordance with the volume shrinkage of JIS K6901 (Section 5.12).

本発明の樹脂組成物の貯蔵弾性率及び/又は屈折率については、本発明の画像表示装置1の樹脂硬化物層5について記述した内容を好ましく適用することができる。   About the storage elastic modulus and / or refractive index of the resin composition of this invention, the content described about the resin cured material layer 5 of the image display apparatus 1 of this invention can be applied preferably.

更に、本発明の樹脂組成物は、その硬化物の凝集力が小さすぎると反りに追随できず凝集破壊が生じるので、好ましくは25℃で30N/cm以上且つ80℃で5N/cm以上、より好ましくは25℃で40〜80N/cm且つ80℃で10〜15N/cmの凝集力を有する。ここで、凝集力は次のように測定した値である。即ち、短冊状の2mm厚のPMMA板と1mm厚のガラス基板とを用意する。つぎに、ガラス基板の中央部に直径6mmの樹脂組成物を滴下し、0.1mmスペーサーを介してその上からPMMA基板を直交するように載置し、紫外線を照射して硬化させて試験片を作成する。この試験片のPMMA基板を固定し、他方、ガラス基板におけるPMMA基板と接触していない両端部を押圧治具(クロスヘッド)により押圧し、PMMA基板とガラス基板とが分離するまでに要する応力を測定する。押圧速度は5mm/minであり、得られた応力を単位面積
で除して凝集力とする。
Further, the resin composition of the present invention, since the the cohesive force of the cured product is too small can not follow the warping cohesive failure occurs, preferably 25 ° C. at 30 N / cm 2 or more and 80 ° C. with 5N / cm 2 or more , more preferably cohesive force of 10 to 15 N / cm 2 at 40~80N / cm 2 and 80 ° C. at 25 ° C.. Here, the cohesive force is a value measured as follows. That is, a strip-like 2 mm thick PMMA plate and a 1 mm thick glass substrate are prepared. Next, a resin composition having a diameter of 6 mm is dropped on the central portion of the glass substrate, and the PMMA substrate is placed so as to be orthogonal thereto from above through a 0.1 mm spacer, and cured by irradiating with ultraviolet rays. Create The PMMA substrate of this test piece is fixed, and on the other hand, both ends of the glass substrate that are not in contact with the PMMA substrate are pressed by a pressing jig (cross head), and the stress required until the PMMA substrate and the glass substrate are separated is measured. taking measurement. The pressing speed is 5 mm / min, and the obtained stress is divided by the unit area to obtain the cohesive force.

以上説明したような本発明の樹脂組成物としては、基本的には、ポリマーとモノマーと光重合開始剤とからなる組成物である。光重合開始剤について、保護部3には、画像表示部2に対する紫外線保護の観点から紫外線領域の光をカットする機能が付与されていることが多いため、光重合開始剤としては、α―ヒドロキシケトン類などの通常の紫外線感応性の光重合開始剤に加えて、可視光領域でも硬化能を示す光重合開始剤(例えば、ジフェニル−(2,4,6−トリメチルベンゾイル)フォスフィンオキサイド(商品名SpeedCureTPO、日本シイベルヘグナー(株)製)等)を併用することが好ましい。   As described above, the resin composition of the present invention is basically a composition comprising a polymer, a monomer, and a photopolymerization initiator. As for the photopolymerization initiator, since the protection unit 3 is often provided with a function of cutting light in the ultraviolet region from the viewpoint of ultraviolet protection for the image display unit 2, α-hydroxy is used as the photopolymerization initiator. In addition to ordinary UV-sensitive photopolymerization initiators such as ketones, photopolymerization initiators that exhibit curing ability in the visible light region (for example, diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide (product Name SpeedCureTPO, manufactured by Nippon Shibel Hegner Co., Ltd.)).

本発明の樹脂組成物としては、例えば、ポリウレタンアクリレート、ポリイソプレン系アクリレート又はそのエステル化物、テルペン系水素添加樹脂及びブタジエン重合体から選ばれる1種以上のポリマーと、イソボルニルアクリレート、ジシクロペンテニルオキシエチルメタクリレート及び2−ヒドロキシブチルメタクリレートから選ばれる1種以上のアクリレート系モノマーと、光重合開始剤とを含有する樹脂組成物を好適に挙げることができる。   Examples of the resin composition of the present invention include one or more polymers selected from polyurethane acrylate, polyisoprene acrylate or esterified products thereof, terpene hydrogenated resins, and butadiene polymers, isobornyl acrylate, and dicyclopentenyl. A resin composition containing one or more acrylate monomers selected from oxyethyl methacrylate and 2-hydroxybutyl methacrylate and a photopolymerization initiator can be preferably exemplified.

より具体的な本発明の樹脂組成物としては、ポリマーが、ポリイソプレン重合物の無水マレイン酸付加物と2−ヒドロキシエチルメタクリレートとのエステル化物、テルペン系水素添加樹脂及びブタジエン重合体であり、モノマーが、ジシクロペンテニルオキシエチルメタクリレート及び2−ヒドロキシブチルメタクリレートであり、光重合開始剤が、1−ヒドロキシシクロヘキシル−フェニルケトン及びジフェニル−(2,4,6−トリメチルベンゾイル)フォスフィンオキサイドである樹脂組成物を挙げることができる。   More specifically, in the resin composition of the present invention, the polymer is an esterified product of a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate, a terpene hydrogenated resin, and a butadiene polymer. Is dicyclopentenyloxyethyl methacrylate and 2-hydroxybutyl methacrylate, and the photopolymerization initiator is 1-hydroxycyclohexyl-phenyl ketone and diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide You can list things.

更に具体的な本発明の樹脂組成物としては、ポリイソプレン重合物の無水マレイン酸付加物と2−ヒドロキシエチルメタクリレートとのエステル化物50〜100質量部、テルペン系水素添加樹脂10〜70質量部及びブタジエン重合体30〜220質量部、ジシクロペンテニルオキシエチルメタクリレート20〜50質量部及び2−ヒドロキシブチルメタクリレート5〜15質量部、1−ヒドロキシシクロヘキシル−フェニルケトン1〜10質量部及びジフェニル−(2,4,6−トリメチルベンゾイル)フォスフィンオキサイド1〜10質量部である樹脂組成物を挙げることができる。   More specific examples of the resin composition of the present invention include 50 to 100 parts by mass of an esterified product of a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate, 10 to 70 parts by mass of a terpene-based hydrogenated resin, and Butadiene polymer 30-220 parts by mass, dicyclopentenyloxyethyl methacrylate 20-50 parts by mass and 2-hydroxybutyl methacrylate 5-15 parts by mass, 1-hydroxycyclohexyl phenyl ketone 1-10 parts by mass and diphenyl- (2, 4,6-trimethylbenzoyl) phosphine oxide 1-10 parts by mass can be mentioned.

なお、本発明の樹脂組成物が硬化する際に樹脂硬化物に蓄積される内部応力の程度は、樹脂組成物を平板上に滴下し、それを硬化させて得られる樹脂硬化物の平均表面粗度によって評価することができる。例えば、樹脂組成物2mgをガラス板上又はアクリル樹脂板上に滴下し、それをUV照射により90%以上の硬化率で硬化させて得られる樹脂硬化物の平均表面粗度が6.0nm以下であれば、画像表示部2と保護部3との間に樹脂組成物を介在させ、それを硬化させた場合にそれらの界面に生じる歪みが実用上無視できるが、本発明の樹脂組成物によれば、この平均表面粗度を6.0nm以下、好ましくは5.0nm以下、より好ましくは1〜3nmにすることができる。ここで、ガラス板としては、液晶セルの液晶を挟持するガラス板や液晶セルの保護板として使用されているものを好ましく使用できる。また、アクリル樹脂板としては、液晶セルの保護板として使用されているものを好ましく使用できる。これらのガラス板やアクリル樹脂板の平均表面粗度は、通常、1.0nm以下である。   The degree of internal stress accumulated in the cured resin when the resin composition of the present invention is cured is determined by dropping the resin composition onto a flat plate and curing it to obtain an average surface roughness of the cured resin. Can be evaluated by degree. For example, 2 mg of a resin composition is dropped on a glass plate or an acrylic resin plate, and the average surface roughness of a cured resin obtained by curing the resin composition with a curing rate of 90% or more by UV irradiation is 6.0 nm or less. If present, the resin composition is interposed between the image display part 2 and the protection part 3 and the distortion generated at the interface between them when cured is negligible in practice, but according to the resin composition of the present invention, For example, the average surface roughness can be 6.0 nm or less, preferably 5.0 nm or less, and more preferably 1 to 3 nm. Here, as a glass plate, what is used as a glass plate which clamps the liquid crystal of a liquid crystal cell, or a protective plate of a liquid crystal cell can be used preferably. Moreover, as an acrylic resin board, what is used as a protective plate of a liquid crystal cell can be used preferably. The average surface roughness of these glass plates and acrylic resin plates is usually 1.0 nm or less.

なお、樹脂硬化層5自体が新規なものである点から、画像表示装置の画像表示部と、透光性の保護部との間に介在する樹脂硬化物層であって、その可視光領域の透過率が90%以上、伸び率が25℃で700%以上且つ80℃で400%以上、及びアクリル樹脂板に対する密着力が25℃で0.4N/cm以上且つ80℃で0.3N/cm以上である樹脂硬化物層も本発明に包含される。この発明の構成要素は既に説明したとおりである。   Since the cured resin layer 5 itself is novel, it is a cured resin layer interposed between the image display portion of the image display device and the translucent protective portion, and has a visible light region. The transmittance is 90% or more, the elongation is 700% or more at 25 ° C. and 400% or more at 80 ° C., and the adhesion to the acrylic resin plate is 0.4 N / cm or more at 25 ° C. and 0.3 N / cm at 80 ° C. The cured resin layer as described above is also included in the present invention. The components of the present invention are as described above.

以下、実施例及び比較例を挙げて本発明を具体的に説明するが、本発明は以下の実施例に限定されるものではない。   EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not limited to a following example.

<実施例1>
ポリイソプレン重合物の無水マレイン酸付加物と2−ヒドロキシエチルメタクリレートとのエステル化物(商品名UC−203、クラレ)55質量部、ジシクロペンテニルオキシエチルメタクリレート(商品名FA512M、日立化成工業)40質量部、2−ヒドロキシブチルメタクリレート(商品名ライトエステルHOB、共栄社化学)10質量部、軟化点85℃±5℃のテルペン系水素添加樹脂(商品名クリアロンP−85、ヤスハラケミカル)60質量部、ブタジエン重合体(商品名Polyoil 110、日本ゼオン)80質量部、光重合開始剤(商品名イルガキュア184D、チバ・スペシャリティ・ケミカルズ)6質量部、光重合開始剤(商品名SpeedCure TPO、日本シイベルヘグナー)1.5質量部を混練機にて混練して実施例1の樹脂組成物を調製した。
<Example 1>
55 parts by mass of an esterified product of maleic anhydride adduct of polyisoprene polymer and 2-hydroxyethyl methacrylate (trade name UC-203, Kuraray), 40 parts by weight of dicyclopentenyloxyethyl methacrylate (trade name FA512M, Hitachi Chemical) Parts, 2-hydroxybutyl methacrylate (trade name Light Ester HOB, Kyoeisha Chemical) 10 parts by weight, terpene hydrogenated resin (trade name Clearon P-85, Yasuhara Chemical) having a softening point of 85 ° C. ± 5 ° C., butadiene heavy 80 parts by weight of coalescence (trade name: Polyoil 110, Nippon Zeon), 6 parts by weight of photopolymerization initiator (trade name: Irgacure 184D, Ciba Specialty Chemicals), 1.5% of photopolymerization initiator (trade name: SpeedCure TPO, Nippon Siber Hegner) Mix parts by mass in a kneader The resin composition of Example 1 was prepared by kneading.

<実施例2>
軟化点85℃±5℃のテルペン系水素添加樹脂(商品名クリアロンP−85、ヤスハラケミカル)60質量部に代えて、軟化点115℃±5℃のテルペン系水素添加樹脂(商品名クリアロンP−115、ヤスハラケミカル)40質量部を使用すること以外は、実施例1と同様にして実施例2の樹脂組成物を調製した。
<Example 2>
Instead of 60 parts by mass of a terpene-based hydrogenated resin (trade name Clearon P-85, Yasuhara Chemical) having a softening point of 85 ° C. ± 5 ° C., a terpene-based hydrogenated resin (trade name Clearon P-115 having a softening point of 115 ° C. ± 5 ° C. , Yasuhara Chemical) A resin composition of Example 2 was prepared in the same manner as Example 1 except that 40 parts by mass were used.

<比較例1>
ポリイソプレン重合物の無水マレイン酸付加物と2−ヒドロキシエチルメタクリレートとのエステル化物(商品名UC−203、クラレ)70質量部、ジシクロペンテニルオキシエチルメタクリレート(商品名FA512M、日立化成工業)30質量部、2−ヒドロキシブチルメタクリレート(商品名ライトエステルHOB、共栄社化学)10質量部、軟化点85℃±5℃のテルペン系水素添加樹脂(商品名クリアロンP−85、ヤスハラケミカル)30質量部、ブタジエン重合体(商品名Polyoil 110、日本ゼオン)140質量部、光重合開始剤(商品名イルガキュア184D、チバ・スペシャリティ・ケミカルズ)2質量部、光重合開始剤(商品名SpeedCure TPO、日本シイベルヘグナー)7質量部を混練機にて混練して比較例1の樹脂組成物を調製した。
<Comparative Example 1>
70 parts by mass of a polyisoprene polymer maleic anhydride adduct and 2-hydroxyethyl methacrylate (trade name UC-203, Kuraray), 30 parts by weight of dicyclopentenyloxyethyl methacrylate (trade name FA512M, Hitachi Chemical) Parts, 2-hydroxybutyl methacrylate (trade name Light Ester HOB, Kyoeisha Chemical) 10 parts by weight, terpene hydrogenated resin (trade name Clearon P-85, Yasuhara Chemical) having a softening point of 85 ° C. ± 5 ° C., butadiene heavy 140 parts by weight of coalescence (trade name Polyoil 110, Nippon Zeon), 2 parts by weight of photopolymerization initiator (trade name Irgacure 184D, Ciba Specialty Chemicals), 7 parts by weight of photopolymerization initiator (trade name SpeedCure TPO, Nippon Siber Hegner) Kneading with a kneader Thus, a resin composition of Comparative Example 1 was prepared.

<実施例3>
軟化点85℃±5℃のテルペン系水素添加樹脂(商品名クリアロンP−85、ヤスハラケミカル)60質量部を15質量部に代えること以外は、実施例1と同様にして実施例3の樹脂組成物を調製した。
<Example 3>
Resin composition of Example 3 in the same manner as in Example 1 except that 60 parts by mass of terpene-based hydrogenated resin (trade name Clearon P-85, Yasuhara Chemical) having a softening point of 85 ° C. ± 5 ° C. is replaced by 15 parts by mass. Was prepared.

実施例1〜3、比較例1で調製した樹脂組成物を、厚さ100μmの白色のアクリル樹脂板上に、所定の膜厚となるように滴下してUVコンベアにて搬送し、所定の厚さの樹脂硬化物を得、これを試料とした。   The resin composition prepared in Examples 1 to 3 and Comparative Example 1 was dropped onto a white acrylic resin plate having a thickness of 100 μm so as to have a predetermined film thickness, and was conveyed by a UV conveyor, and had a predetermined thickness. The cured resin product was obtained and used as a sample.

(評価1)
各試料の光透過率、伸び率、保護板に対する密着力、貯蔵弾性率、硬化収縮率、凝集力及び表面粗度を、以下のようにして求めた。
(Evaluation 1)
The light transmittance, elongation rate, adhesion to the protective plate, storage elastic modulus, cure shrinkage rate, cohesive force, and surface roughness of each sample were determined as follows.

〔光透過率〕
各試料(樹脂硬化物の厚さ100μm)について、紫外可視分光光度計(日本分光(株)製V−560)によって可視光領域の透過率を測定したところ、全て90%以上であった。
(Light transmittance)
With respect to each sample (thickness of cured resin 100 μm), the transmittance in the visible light region was measured by an ultraviolet-visible spectrophotometer (V-560 manufactured by JASCO Corporation), and all were 90% or more.

〔伸び率〕
伸び率は、樹脂組成物を所定の厚さになるように剥離フィルム上に滴下し、ついて紫外線照射して硬化させ、所定の大きさ(例えば、0.6mm、10mm幅、25mm長)にカットして試料を作成し、それを引っ張り試験機(テンシロン、オリエンテック社)で測定した値である。その条件は、雰囲気温度25℃又は80℃、加重5Kgf、引っ張り速度5mm/分、伸び率(%)=L/L0×100で算出する。ここで、L0は基準長さ、Lは破断するまでの変位長さである。
〔Growth rate〕
Elongation rate is dripped on the release film so that the resin composition has a predetermined thickness, then cured by irradiation with ultraviolet rays, and cut into a predetermined size (for example, 0.6 mm, 10 mm width, 25 mm length). Thus, a sample was prepared and measured with a tensile tester (Tensilon, Orientec Co., Ltd.). The conditions are calculated as follows: atmospheric temperature 25 ° C. or 80 ° C., load 5 kgf, pulling speed 5 mm / min, elongation rate (%) = L / L0 × 100. Here, L0 is a reference length, and L is a displacement length until fracture.

〔保護板に対する密着力(JIS K6854−1)〕
PETフィルムに樹脂組成物を50μm厚となるように塗布し、それをPMMA板に貼り合わせ、紫外線を照射して硬化させ試験片(幅2.5cm)とする。次に、PMMA板からPETフィルムと共に樹脂組成物の硬化物を90度方向に、引っ張り試験機(テンシロン、オリエンテック社)を用いて50mm/分の速度で引き剥がす。その引き剥がすために要した力を2.5cmで除した値を密着力とする。
[Adhesion to protection plate (JIS K6854-1)]
A resin composition is applied to a PET film so as to have a thickness of 50 μm, and is bonded to a PMMA plate and cured by irradiation with ultraviolet rays to obtain a test piece (width 2.5 cm). Next, the cured product of the resin composition together with the PET film is peeled from the PMMA plate in a 90-degree direction at a speed of 50 mm / min using a tensile tester (Tensilon, Orientec Co., Ltd.). The value obtained by dividing the force required for peeling off by 2.5 cm is defined as the adhesion force.

〔貯蔵弾性率〕
各試料について、粘弾性測定装置(セイコーインスツルメンツ(株)製DMS6100)を用い、測定周波数1Hzで貯蔵弾性率(Pa)(25℃)を測定した。得られた結果を表1に示す。
[Storage modulus]
About each sample, the storage elastic modulus (Pa) (25 degreeC) was measured with the measurement frequency of 1 Hz using the viscoelasticity measuring apparatus (Seiko Instruments Co., Ltd. product DMS6100). The obtained results are shown in Table 1.

〔硬化収縮率〕
さらに、硬化収縮率(%)については、硬化前の樹脂液と硬化後の固体の比重を電子比重計(MIRAGE社製SD−120L)を用いて測定し、両者の比重差から次式により算出した。得られた結果を表1に示す。
[Curing shrinkage]
Further, the curing shrinkage (%) is measured by using an electronic hydrometer (MIRAGE SD-120L) to measure the specific gravity of the resin liquid before curing and the solid after curing, and is calculated from the difference between the specific gravity by the following equation. did. The obtained results are shown in Table 1.

Figure 0005477417
Figure 0005477417

〔凝集力〕
短冊状の2mm厚のPMMA板と1mm厚のガラス基板とを用意する。つぎに、ガラス基板の中央部に直径6mmの樹脂組成物を滴下し、0.1mmスペーサーを介してその上からPMMA基板を直交するように載置して試験片を作成する。この試験片のPMMA基板を固定し、他方、ガラス基板におけるPMMA基板と接触していない両端部を押圧治具(クロスヘッド)により押圧し、PMMA基板とガラス基板とが分離するまでに要する応力を測定する。押圧速度は5mm/minであり、得られた応力を単位面積で除して凝集力とする。
[Cohesive strength]
A strip-shaped PMMA plate having a thickness of 2 mm and a glass substrate having a thickness of 1 mm are prepared. Next, a resin composition having a diameter of 6 mm is dropped on the central portion of the glass substrate, and a PMMA substrate is placed thereon from above through a 0.1 mm spacer to prepare a test piece. The PMMA substrate of this test piece is fixed, and on the other hand, both ends of the glass substrate that are not in contact with the PMMA substrate are pressed by a pressing jig (cross head), and the stress required until the PMMA substrate and the glass substrate are separated is measured. taking measurement. The pressing speed is 5 mm / min, and the obtained stress is divided by the unit area to obtain the cohesive force.

〔表面粗度の測定〕
各樹脂組成物について、それぞれ2mgを液晶セル用ガラス板に滴下し、UV硬化の際に生ずる内部応力により発生するガラス板表面の所定領域(2.93mm×2.20mm)の歪み(Ra:平均表面粗度)を、Zygo社製3次元非接触表面粗度測定計にて測定した。得られた結果を表1に示す。
(Measurement of surface roughness)
For each resin composition, 2 mg of each resin composition was dropped onto a glass plate for a liquid crystal cell, and a predetermined area (2.93 mm × 2.20 mm) strain (Ra: average) generated by internal stress generated during UV curing. Surface roughness) was measured with a three-dimensional non-contact surface roughness meter manufactured by Zygo. The obtained results are shown in Table 1.

Figure 0005477417
Figure 0005477417

表1から明らかなように、実施例1〜3は、伸び率が25℃で700%以上、80℃で400%以上で、保護部に対する密着力が25℃で0.4N/cm以上、80℃で0.3N/cmであるので、歪みがほとんどなく、良好な結果が得られた。なお、実施例3の場合、実施例1及び2の場合に比べ、硬化収縮率が若干高いので、僅かに表示ムラが観察さえたが実用上問題のないレベルであった。   As is apparent from Table 1, Examples 1 to 3 have an elongation of 700% or more at 25 ° C., 400% or more at 80 ° C., and an adhesion force to the protective part of 0.4 N / cm or more at 25 ° C., 80 Since it was 0.3 N / cm at 0 ° C., there was almost no distortion, and good results were obtained. In the case of Example 3, the curing shrinkage rate was slightly higher than that of Examples 1 and 2, so that display unevenness was slightly observed, but at a level where there was no practical problem.

これに対し、比較例1の場合には伸び率と保護部に対する密着力がいずれも不充分であった。   On the other hand, in the case of Comparative Example 1, both the elongation and the adhesion to the protective part were insufficient.

(評価2)
次に、上述の実施例及び比較例の樹脂組成物を使用してパネル試料を作成し、耐衝撃性行った。即ち、大きさ50mm×50mm、厚さ0.5mmのガラス板(画像表示部)と、大きさ50mm×50mm、厚さ0.5mmのポリメチルメタクリレート板(保護部)の間に、実施例1又は2の樹脂組成物を厚さ0.1mmに硬化させたものを実施例のパネル試料とした。この場合、スペーサは用いておらず、パネル試料の総厚さは、1.1mmであった。なお、このパネル試料の作製方法としては、ガラス板上に実施例1の樹脂組成物を塗布し、その上にポリメチルメタクリレート板を重ね、そのポリメチルメタクリレート板側からUV照射することにより樹脂組成物を硬化させた。
(Evaluation 2)
Next, panel samples were prepared using the resin compositions of the above-described Examples and Comparative Examples, and impact resistance was performed. That is, Example 1 between a glass plate (image display portion) having a size of 50 mm × 50 mm and a thickness of 0.5 mm and a polymethyl methacrylate plate (protection portion) having a size of 50 mm × 50 mm and a thickness of 0.5 mm. Or what made the resin composition of 2 hardened to thickness 0.1mm was made into the panel sample of an Example. In this case, no spacer was used, and the total thickness of the panel sample was 1.1 mm. As a method for producing this panel sample, the resin composition of Example 1 was applied on a glass plate, a polymethyl methacrylate plate was overlaid thereon, and UV irradiation was performed from the polymethyl methacrylate plate side. The object was cured.

一方、図4に示す従来技術の構成のパネル試料を作成した。この場合、液晶表示パネル(画像表示部)102及び保護部103として、上述の実施例のパネル試料と同一の部材を用い、画像表示部と保護部との間に厚さ1.0mmのスペーサを介在させて、エアギャップが1.0mmで総厚さ2.0mmの比較例のパネル試料とした。   On the other hand, a panel sample having a conventional configuration shown in FIG. 4 was prepared. In this case, as the liquid crystal display panel (image display unit) 102 and the protection unit 103, the same member as the panel sample of the above-described embodiment is used, and a spacer having a thickness of 1.0 mm is provided between the image display unit and the protection unit. A panel sample of a comparative example having an air gap of 1.0 mm and a total thickness of 2.0 mm was interposed.

実施例及び比較例のパネル試料について、所定の治具を用いて縁部分を固定し、直径5mmの押圧部を用い、保護部表面に対して垂直方向から押し付け速度1mm/秒で押圧部を保護部表面に押し付けてパネル破壊試験を行った。   About the panel sample of an Example and a comparative example, an edge part is fixed using a predetermined | prescribed jig | tool, a press part with a diameter of 5 mm is used, and a press part is protected from the perpendicular direction with respect to the protection part surface at a speed of 1 mm / second. A panel destructive test was conducted by pressing against the surface of the part.

その結果、実施例のパネルによれば、押し付け強度が150%向上し、しかも比較例のパネルに比べて薄型のパネルが得られることが理解される。   As a result, according to the panel of the example, it is understood that the pressing strength is improved by 150% and that a thin panel is obtained as compared with the panel of the comparative example.

本発明は、液晶表示装置などの画像表示装置等に有用である。   The present invention is useful for an image display device such as a liquid crystal display device.

1、1B 画像表示装置
2 画像表示部
3 保護部
4 スペーサ
5 樹脂硬化物又は樹脂硬化物層
6、7 偏光板
DESCRIPTION OF SYMBOLS 1, 1B Image display apparatus 2 Image display part 3 Protection part 4 Spacer 5 Resin hardened | cured material or resin hardened | cured material layer 6, 7 Polarizing plate

Claims (17)

画像表示部と、該画像表示部上に配置された透光性の保護部とを有する画像表示装置であって、
画像表示部と保護部との間に、熱硬化型又はエネルギー線硬化型の樹脂組成物から硬化収縮率が5%以下となるように形成された樹脂硬化物層が介在し、
樹脂硬化物層は、可視光領域の透過率が90%以上、伸び率が25℃で700%以上1000%以下且つ80℃で400%以上550%以下、及び保護部に対する密着力が25℃で0.4N/cm以上0.65N/cm以下且つ80℃で0.3N/cm以上0.5N/cm以下である画像表示装置。
An image display device having an image display unit and a translucent protection unit disposed on the image display unit,
Between the image display part and the protective part, a cured resin layer formed such that the curing shrinkage rate is 5% or less from a thermosetting or energy ray curable resin composition is interposed,
The cured resin layer has a visible light transmittance of 90% or more, an elongation of 700% to 1000% at 25 ° C. and 400% to 550% at 80 ° C., and an adhesive strength to a protective part of 25 ° C. An image display device of 0.4 N / cm or more and 0.65 N / cm or less and 0.3 N / cm or more and 0.5 N / cm or less at 80 ° C.
樹脂硬化物層の伸び率が、25℃で800%以上且つ80℃で500%以上、及び保護部に対する密着力が25℃で0.5N/cm以上且つ80℃で0.4N/cm以上である請求項1記載の画像表示装置。   The elongation rate of the cured resin layer is 800% or more at 25 ° C. and 500% or more at 80 ° C., and the adhesion to the protective part is 0.5 N / cm or more at 25 ° C. and 0.4 N / cm or more at 80 ° C. The image display device according to claim 1. 保護部が、アクリル樹脂板からなる請求項1又は2記載の画像表示装置。   The image display device according to claim 1, wherein the protection part is made of an acrylic resin plate. 樹脂硬化物層の25℃における貯蔵弾性率が、1×10〜1×10Paである請求項1〜3のいずれかに記載の画像表示装置。 The image display apparatus according to claim 1, wherein the cured resin layer has a storage elastic modulus at 25 ° C. of 1 × 10 3 to 1 × 10 6 Pa. 樹脂硬化物層の厚みが50〜250μmである請求項1〜4のいずれかに記載の画像表示装置。   The image display device according to claim 1, wherein the cured resin layer has a thickness of 50 to 250 μm. 画像表示部が、液晶表示パネルである請求項1〜5のいずれかに記載の画像表示装置。   The image display device according to claim 1, wherein the image display unit is a liquid crystal display panel. 画像表示装置の画像表示部と、透光性の保護部との間に介在させる樹脂硬化物層を形成するための熱硬化型又はエネルギー線硬化型の樹脂組成物であって、それを硬化収縮率が5%以下となるように硬化させた樹脂硬化物の可視光領域の透過率が厚さ100μmの場合に90%以上、伸び率が25℃で700%以上1000%以下且つ80℃で400%以上550%以下、及びアクリル樹脂板に対する密着力が25℃で0.4N/cm以上0.65N/cm以下且つ80℃で0.3N/cm以上0.5N/cm以下である樹脂組成物。 A thermosetting or energy ray curable resin composition for forming a cured resin layer interposed between an image display portion of an image display device and a translucent protective portion, which is cured and shrunk. 90% or more when the transmittance in the visible light region of the cured resin cured so that the rate is 5% or less is 100 μm, 400 % at 80 ° C. and 700% to 1000% elongation at 25 ° C. % Or more and 550% or less , and a resin composition having an adhesive force of 0.4 N / cm or more and 0.65 N / cm or less at 25 ° C. and 0.3 N / cm or more and 0.5 N / cm or less at 80 ° C. . 樹脂硬化物層の伸び率が、25℃で800%以上且つ80℃で500%以上、及びアクリル樹脂板に対する密着力が25℃で0.5N/cm以上且つ80℃で0.4N/cm以上である請求項7記載の樹脂組成物。   The elongation ratio of the cured resin layer is 800% or more at 25 ° C. and 500% or more at 80 ° C., and the adhesion to the acrylic resin plate is 0.5 N / cm or more at 25 ° C. and 0.4 N / cm or more at 80 ° C. The resin composition according to claim 7. 硬化収縮率が、4.0%以下である請求項7又は8記載の樹脂組成物。   The resin composition according to claim 7 or 8, which has a cure shrinkage of 4.0% or less. 硬化収縮率が、3.0%以下である請求項7又は8記載の樹脂組成物。   The resin composition according to claim 7 or 8, wherein the curing shrinkage is 3.0% or less. 硬化収縮率が、2.5%以下である請求項7又は8記載の樹脂組成物。   The resin composition according to claim 7 or 8, wherein the curing shrinkage is 2.5% or less. 樹脂組成物の硬化物の25℃における貯蔵弾性率が、1×10〜1×10Paである請求項7〜11のいずれかに記載の樹脂組成物。 The resin composition according to any one of claims 7 to 11, wherein the cured product of the resin composition has a storage elastic modulus at 25 ° C of 1 x 10 3 to 1 x 10 6 Pa. ポリウレタンアクリレート、ポリイソプレン系アクリレート又はそのエステル化物、テルペン系水素添加樹脂及びブタジエン重合体から選ばれる1種以上のポリマーと、イソボルニルアクリレート、ジシクロペンテニルオキシエチルメタクリレート及び2−ヒドロキシブチルメタクリレートから選ばれる1種以上のアクリレート系モノマーと、光重合開始剤とを含有する請求項7〜12のいずれかに記載の樹脂組成物。   At least one polymer selected from polyurethane acrylate, polyisoprene acrylate or esterified product thereof, terpene hydrogenated resin and butadiene polymer, and selected from isobornyl acrylate, dicyclopentenyloxyethyl methacrylate and 2-hydroxybutyl methacrylate. The resin composition in any one of Claims 7-12 containing the 1 or more types of acrylate-type monomer and a photoinitiator. ポリマーが、ポリイソプレン重合物の無水マレイン酸付加物と2−ヒドロキシエチルメタクリレートとのエステル化物、テルペン系水素添加樹脂及びブタジエン重合体であり、モノマーが、ジシクロペンテニルオキシエチルメタクリレート及び2−ヒドロキシブチルメタクリレートであり、光重合開始剤が、1−ヒドロキシシクロヘキシル−フェニルケトン及びジフェニル−(2,4,6−トリメチルベンゾイル)フォスフィンオキサイドである請求項13記載の樹脂組成物。   The polymer is an esterified product of a polyisoprene polymer maleic anhydride adduct and 2-hydroxyethyl methacrylate, a terpene hydrogenated resin, and a butadiene polymer, and the monomers are dicyclopentenyloxyethyl methacrylate and 2-hydroxybutyl. The resin composition according to claim 13, which is methacrylate and the photopolymerization initiator is 1-hydroxycyclohexyl-phenyl ketone and diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide. 樹脂組成物2mgをガラス板上又はアクリル板上に滴下し、それをUV照射により硬化させた樹脂硬化物の平均表面粗度が6.0nm以下である請求項7〜14のいずれかに記載の樹脂組成物。   The average surface roughness of a resin cured product obtained by dropping 2 mg of a resin composition on a glass plate or an acrylic plate and curing the resin composition by UV irradiation is 6.0 nm or less. Resin composition. 樹脂組成物2mgをガラス板上又はアクリル板上に滴下し、それをUV照射により硬化させた樹脂硬化物の平均表面粗度が5.0nm以下である請求項7〜15のいずれかに記載の樹脂組成物。   The average surface roughness of a cured resin obtained by dripping 2 mg of a resin composition on a glass plate or an acrylic plate and curing the resin composition by UV irradiation is 5.0 nm or less. Resin composition. 画像表示装置の画像表示部と、透光性の保護部との間に介在し、熱硬化型又はエネルギー線硬化型の樹脂組成物から硬化収縮率が5%以下となるように形成された樹脂硬化物層であって、その可視光領域の透過率が90%以上、伸び率が25℃で700%以上1000%以下且つ80℃で400%以上550%以下、及びアクリル樹脂板に対する密着力が25℃で0.4N/cm以上0.65N/cm以下且つ80℃で0.3N/cm以上0.5N/cm以下である樹脂硬化物層。
Resin that is interposed between an image display unit of an image display device and a translucent protective unit, and is formed from a thermosetting or energy ray curable resin composition so that the curing shrinkage is 5% or less. The cured product layer has a visible light region transmittance of 90% or more, an elongation of 700% to 1000% at 25 ° C., and 400% to 550% at 80 ° C., and adhesion to an acrylic resin plate. A cured resin layer that is 0.4 N / cm or more and 0.65 N / cm or less at 25 ° C. and 0.3 N / cm or more and 0.5 N / cm or less at 80 ° C.
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