TW201817056A - Optical laminate and image display device - Google Patents
Optical laminate and image display device Download PDFInfo
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- TW201817056A TW201817056A TW106130393A TW106130393A TW201817056A TW 201817056 A TW201817056 A TW 201817056A TW 106130393 A TW106130393 A TW 106130393A TW 106130393 A TW106130393 A TW 106130393A TW 201817056 A TW201817056 A TW 201817056A
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Classifications
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
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- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
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Abstract
Description
本發明係關於一種光學積層體及使用其之圖像顯示裝置。The present invention relates to an optical multilayer body and an image display device using the same.
近年來,隨著薄型顯示器之普及,提出有搭載了有機EL(Electroluminescence,電致發光)面板之顯示器(有機EL顯示裝置)。有機EL面板由於具有反射性較高之金屬層,故而容易產生外光反射或背景之映入等問題。因此,已知藉由將圓偏光板設置於視認側而防止該等問題。另一方面,於顯示單元(例如有機EL單元)與偏光板之間組入有觸控感測器之所謂內觸控面板型輸入顯示裝置之需求增加。此種構成之輸入顯示裝置由於圖像顯示單元與觸控感測器之距離較近,故而可對使用者給予自然之輸入操作感。 於內觸控面板型輸入顯示裝置用之偏光板(或圓偏光板)中,就薄型化、防止品質之不均、提高製造效率等觀點而言,對偏光板(或圓偏光板)與觸控感測器用導電性膜之一體化進行了研究。但是,與觸控感測器用導電性膜一體化之偏光板存在如下問題:於高溫高濕下,導電性膜之導電層容易產生龜裂。 [先前技術文獻] [專利文獻] 專利文獻1:日本專利特開2003-311239號公報 專利文獻2:日本專利特開2002-372622號公報 專利文獻3:日本專利第3325560號公報 專利文獻4:日本專利特開2003-036143號公報In recent years, with the spread of thin displays, displays (organic EL display devices) equipped with an organic EL (Electroluminescence) panel have been proposed. Since the organic EL panel has a highly reflective metal layer, it is easy to cause problems such as reflection of external light or reflection of the background. Therefore, it is known to prevent such problems by arranging a circularly polarizing plate on the viewing side. On the other hand, there is an increasing demand for a so-called internal touch panel type input display device in which a touch sensor is incorporated between a display unit (such as an organic EL unit) and a polarizing plate. The input display device with such a structure can give the user a natural input operation feeling because the distance between the image display unit and the touch sensor is relatively short. In a polarizing plate (or circular polarizing plate) for an internal touch panel type input display device, from the viewpoints of thinness, preventing uneven quality, and improving manufacturing efficiency, the polarizing plate (or circular polarizing plate) and the The integration of the conductive film for the sensor is studied. However, a polarizing plate integrated with a conductive film for a touch sensor has a problem that the conductive layer of the conductive film is prone to cracking under high temperature and high humidity. [Prior Art Literature] [Patent Literature] Patent Literature 1: Japanese Patent Laid-Open No. 2003-311239 Patent Literature 2: Japanese Patent Laid-Open No. 2002-372622 Patent Literature 3: Japanese Patent No. 3325560 Patent Literature 4: Japan Patent Publication No. 2003-036143
[發明所欲解決之問題] 本發明係為了解決上述先前之問題而成者,其主要目的在於提供一種高溫高濕下之導電層之龜裂得到抑制之光學積層體。 [解決問題之技術手段] 本發明之光學積層體依序具有:包含偏光元件及位於該偏光元件之至少一側之保護層的偏光板、第1相位差層、第2相位差層、以及導電層。於該光學積層體中,設置有將第2相位差層與導電層接著之黏著劑層,構成該黏著劑層之黏著劑包含黏著性聚合物,構成該黏著性聚合物之所有單體成分中之酸成分之量未達4重量%,該黏著劑之85℃下之儲存彈性模數為1.0×104 Pa~7.0×104 Pa。 於一實施形態中,上述偏光元件之吸收軸與上述第1相位差層之遲相軸所成之角度為10°~20°,該吸收軸與上述第2相位差層之遲相軸所成之角度為65°~85°。 於一實施形態中,上述第1相位差層及上述第2相位差層包含環狀烯烴系樹脂膜。於該情形時,上述第2相位差層之尺寸變化率例如為1%以下。 於另一實施形態中,上述第1相位差層及上述第2相位差層為液晶化合物之配向固化層。於該情形時,上述偏光板、上述第1相位差層及上述第2相位差層之積層體之尺寸變化率例如為1%以下。 根據本發明之另一態樣,提供一種圖像顯示裝置。該圖像顯示裝置具備上述光學積層體。 [發明之效果] 根據本發明,於具有偏光板、2個相位差層及觸控感測器用導電層之光學積層體中,關於構成將相位差層與導電層接著之接著層之黏著劑,使構成該黏著層之黏著性聚合物之所有單體成分中之酸成分最佳化為特定量以下,且使該黏著劑之儲存彈性模數最佳化為特定範圍,藉此可顯著地抑制高溫高濕下之導電層產生龜裂。其結果,可實現具有非常優異之耐久性之光學積層體。[Problems to be Solved by the Invention] The present invention has been made in order to solve the above-mentioned problems, and its main object is to provide an optical laminated body in which cracking of a conductive layer under high temperature and high humidity is suppressed. [Technical means to solve the problem] The optical multilayer body of the present invention has a polarizing plate including a polarizing element and a protective layer located on at least one side of the polarizing element, a first retardation layer, a second retardation layer, and a conductive layer in this order. Floor. An adhesive layer is provided in the optical multilayer body to connect the second phase difference layer and the conductive layer. The adhesive constituting the adhesive layer includes an adhesive polymer, and all monomer components constituting the adhesive polymer are included in the adhesive layer. The amount of the acid component is less than 4% by weight, and the storage elastic modulus of the adhesive at 85 ° C. is 1.0 × 10 4 Pa to 7.0 × 10 4 Pa. In one embodiment, an angle formed by the absorption axis of the polarizing element and the late phase axis of the first retardation layer is 10 ° to 20 °, and the absorption axis is formed by the late phase axis of the second retardation layer. The angle is 65 ° to 85 °. In one embodiment, the first retardation layer and the second retardation layer include a cyclic olefin-based resin film. In this case, the dimensional change rate of the second retardation layer is, for example, 1% or less. In another embodiment, the first retardation layer and the second retardation layer are alignment-cured layers of a liquid crystal compound. In this case, the dimensional change rate of the laminated body of the polarizing plate, the first retardation layer, and the second retardation layer is, for example, 1% or less. According to another aspect of the present invention, an image display device is provided. This image display device includes the optical laminated body. [Effects of the Invention] According to the present invention, in an optical multilayer body including a polarizing plate, two retardation layers, and a conductive layer for a touch sensor, regarding an adhesive constituting an adhesive layer that bonds a retardation layer to a conductive layer, The acid component in all the monomer components of the adhesive polymer constituting the adhesive layer is optimized to a specific amount or less, and the storage elastic modulus of the adhesive is optimized to a specific range, thereby significantly suppressing The conductive layer is cracked under high temperature and humidity. As a result, an optical laminate having extremely excellent durability can be realized.
以下,對本發明之實施形態進行說明,但本發明不限定於該等實施形態。 (用語及記號之定義) 本說明書中之用語及記號之定義如下所述。 (1)折射率(nx、ny、nz) 「nx」為面內之折射率最大之方向(即遲相軸方向)之折射率,「ny」為於面內與遲相軸正交之方向(即進相軸方向)之折射率,「nz」為厚度方向之折射率。 (2)面內相位差(Re) 「Re(λ)」為於23℃下以波長λ nm之光所測得之面內相位差。例如,「Re(550)」為於23℃下以波長550 nm之光所測得之面內相位差。Re(λ)係於將層(膜)之厚度設為d(nm)時,藉由式:Re(λ)=(nx-ny)×d而求出。 (3)厚度方向之相位差(Rth) 「Rth(λ)」為於23℃下以波長λ nm之光所測得之厚度方向之相位差。例如,「Rth(550)」為於23℃下以波長550 nm之光所測得之厚度方向之相位差。Rth(λ)係於將層(膜)之厚度設為d(nm)時,藉由式:Rth(λ)=(nx-nz)×d而求出。 (4)Nz係數 Nz係數係藉由Nz=Rth/Re而求出。 A.光學積層體之整體構成 圖1係本發明之一實施形態之光學積層體之概略剖視圖。本實施形態之光學積層體100依序具有偏光板10、第1相位差層20、第2相位差層30、及導電層50。於光學積層體100中,設置有將第2相位差層30與導電層50接著之黏著劑層40。偏光板10包含偏光元件11、配置於偏光元件11之一側之第1保護層12、及配置於偏光元件11之另一側之第2保護層13。根據目的亦可省略第1保護層12及第2保護層13之一者。例如,於第1相位差層20亦可作為偏光元件11之保護層而發揮功能之情形時,亦可省略第2保護層13。就實用而言,導電層能以具有導電層51及基材52之附有基材之導電層之形式提供。因此,光學積層體100亦可進而具有導電層51之基材52。再者,為了便於觀察,圖式中之各層之厚度之比率與實際不同。 於本發明之實施形態中,構成黏著劑層40之黏著劑包含黏著性聚合物,構成該黏著性聚合物之所有單體成分中之酸成分之量未達4重量%,較佳為0~3重量%,更佳為0~2重量%,進而較佳為0~1重量%,尤佳為實質上為零。若酸成分之量為此種範圍,則酸成分對導電層之不良影響減小至可忽視之程度,結果,於高溫高濕下可顯著地抑制導電層產生龜裂。再者,於本說明書中所謂「實質上為零」,意指除了不可避免地混入之情形以外不主動地調配。進而,黏著劑之85℃下之儲存彈性模數為1.0×104
Pa~7.0×104
Pa,較佳為2.0×104
Pa~6.0×104
Pa,更佳為3.0×104
Pa~5.5×104
Pa。儲存彈性模數可依據JIS K 7244而測得。 於一實施形態中,第1相位差層20及第2相位差層30分別包含樹脂膜。於另一實施形態中,第1相位差層20及第2相位差層30可分別為液晶化合物之配向固化層。再者,分別於C-2項及D-2項中對樹脂膜詳細地進行說明,於C-3項及D-3項中對液晶化合物之配向固化層詳細地進行說明。 除了第2相位差層30與導電層50之接著以外,構成光學積層體之各層可經由任意適當之接著層(接著劑層或黏著劑層:未圖示)而積層,亦可直接(即,不使用接著層)積層。 光學積層體之尺寸變化率較佳為1%以下,更佳為0.95%以下。光學積層體之尺寸變化率越小越佳。光學積層體之尺寸變化率之下限例如為0.01%。若光學積層體之尺寸變化率為此種範圍,則可顯著地抑制高溫高濕下之導電層產生龜裂。再者,於本說明書中,尺寸變化率係指於溫度85℃及相對濕度85%之環境下放置240小時之時的尺寸變化率。 光學積層體之總厚度較佳為220 μm以下,更佳為80 μm~190 μm。於第1相位差層20及第2相位差層30為液晶化合物之配向固化層之情形時,光學積層體之總厚度較佳為175 μm以下,更佳為80 μm~140 μm。 光學積層體可為長條狀(例如卷狀),亦可為單片狀。 以下,對構成光學積層體之各層、光學膜、及黏著劑更加詳細地進行說明。 B.偏光板 B-1.偏光元件 作為偏光元件11,可採用任意適當之偏光元件。例如,形成偏光元件之樹脂膜可為單層之樹脂膜,亦可為兩層以上之積層體。 作為包含單層之樹脂膜的偏光元件之具體例,可列舉:對於聚乙烯醇(PVA)系膜、部分縮甲醛化PVA系膜、乙烯-乙酸乙烯酯共聚物系部分皂化膜等親水性高分子膜,實施利用碘或二色性染料等二色性物質進行之染色處理及延伸處理而成者;PVA之脫水處理物或聚氯乙烯之脫氯化氫處理物等多烯系配向膜等。就光學特性優異之方面而言,較佳為使用利用碘將PVA系膜染色並進行單軸延伸而獲得之偏光元件。 上述利用碘進行之染色例如係藉由將PVA系膜浸漬於碘水溶液中而進行。上述單軸延伸之延伸倍率較佳為3~7倍。延伸可於染色處理後進行,亦可一面染色一面進行。又,亦可於延伸後進行染色。視需要對PVA系膜實施膨潤處理、交聯處理、洗淨處理、乾燥處理等。例如藉由在染色之前將PVA系膜浸漬於水中並進行水洗,不僅可將PVA系膜表面之污垢或抗黏連劑洗淨,而且亦可使PVA系膜膨潤而防止染色不均等。 作為使用積層體而獲得之偏光元件之具體例,可列舉:使用樹脂基材與積層於該樹脂基材上之PVA系樹脂層(PVA系樹脂膜)之積層體、或樹脂基材與塗佈形成於該樹脂基材上之PVA系樹脂層之積層體而獲得之偏光元件。使用樹脂基材與塗佈形成於該樹脂基材上之PVA系樹脂層之積層體而獲得之偏光元件例如可藉由如下方式製作:將PVA系樹脂溶液塗佈於樹脂基材上並使其乾燥而於樹脂基材上形成PVA系樹脂層,獲得樹脂基材與PVA系樹脂層之積層體;對該積層體進行延伸及染色而將PVA系樹脂層製成偏光元件。於本實施形態中,具代表性而言,延伸包括使積層體浸漬於硼酸水溶液中並進行延伸。進而,延伸視需要可進而包括於硼酸水溶液中之延伸之前將積層體於高溫(例如95℃以上)下進行空中延伸。所獲得之樹脂基材/偏光元件之積層體可直接使用(即,可將樹脂基材作為偏光元件之保護層),亦可自樹脂基材/偏光元件之積層體將樹脂基材剝離,並於該剝離面上積層與目的相應之任意適當之保護層而使用。此種偏光元件之製造方法之詳細內容例如係記載於日本專利特開2012-73580號公報中。該公報之整體記載係以參考之形式引用至本說明書中。 偏光元件之厚度較佳為18 μm以下,更佳為1 μm~12 μm,進而較佳為3 μm~12 μm,尤佳為5 μm~12 μm。 偏光元件之硼酸含量較佳為18重量%以上,更佳為18重量%~25重量%。若偏光元件之硼酸含量為此種範圍,則可藉由與下述碘含量之協同效應而良好地維持貼合時之捲縮調整之容易性,且良好地抑制加熱時之捲縮,並且改善加熱時之外觀耐久性。硼酸含量例如可由中和法使用下述式以每單位重量之偏光元件中所包含之硼酸量之形式算出。 [數1]偏光元件之碘含量較佳為2.1重量%以上,更佳為2.1重量%~3.5重量%。若偏光元件之碘含量為此種範圍,則可藉由與上述硼酸含量之協同效應而良好地維持貼合時之捲縮調整之容易性,且良好地抑制加熱時之捲縮,並且改善加熱時之外觀耐久性。於本說明書中,所謂「碘含量」意指偏光元件(PVA系樹脂膜)中所包含之所有碘之量。更具體而言,於偏光元件中,碘以碘離子(I-
)、碘分子(I2
)、聚碘離子(I3 -
、I5 -
)等形態存在,本說明書中之碘含量意指包含該等所有形態之碘之量。碘含量例如可藉由螢光X射線分析之校準曲線法而算出。再者,聚碘離子於偏光元件中以形成PVA-碘錯合物之狀態存在。藉由形成此種錯合物,可於可見光之波長範圍內表現出吸收二色性。具體而言,PVA與三碘化物離子之錯合物(PVA-I3 -
)於470 nm附近具有吸光波峰,PVA與五碘化物離子之錯合物(PVA-I5 -
)於600 nm附近具有吸光波峰。結果,聚碘離子可根據其形態於可見光之較廣範圍內吸收光。另一方面,碘離子(I-
)於230 nm附近具有吸光波峰,實質上不參與可見光之吸收。因此,以與PVA之錯合物之狀態存在之聚碘離子可主要參與偏光元件之吸收性能。 偏光元件較佳為於波長380 nm~780 nm之任一波長下表現出吸收二色性。偏光元件之單體透過率如上所述為43.0%~46.0%,較佳為44.5%~46.0%。偏光元件之偏光度較佳為97.0%以上,更佳為99.0%以上,進而較佳為99.9%以上。 B-2.第1保護層 第1保護層12係由可用作偏光元件之保護層的任意適當之膜而形成。作為成為該膜之主成分的材料之具體例,可列舉:三乙醯纖維素(TAC)等纖維素系樹脂,或聚酯系、聚乙烯醇系、聚碳酸酯系、聚醯胺系、聚醯亞胺系、聚醚碸系、聚碸系、聚苯乙烯系、聚降烯系、聚烯烴系、(甲基)丙烯酸系、乙酸酯系等之透明樹脂等。又,亦可列舉(甲基)丙烯酸系、胺基甲酸酯系、(甲基)丙烯酸胺基甲酸酯系、環氧系、矽酮系等之熱硬化型樹脂或紫外線硬化型樹脂等。此外,例如亦可列舉矽氧烷系聚合物等玻璃質系聚合物。又,亦可使用日本專利特開2001-343529號公報(WO01/37007)中所記載之聚合物膜。作為該膜之材料,例如可使用含有於側鏈中具有經取代或未經取代之亞胺基之熱塑性樹脂、及於側鏈中具有經取代或未經取代之苯基及腈基之熱塑性樹脂的樹脂組合物,例如可列舉含有包含異丁烯與N-甲基馬來醯亞胺之交替共聚物、及丙烯腈-苯乙烯共聚物之樹脂組合物。該聚合物膜例如可為上述樹脂組合物之擠出成形物。 如下所述般,本發明之光學積層體具代表性而言係配置於圖像顯示裝置之視認側,第1保護層12具代表性而言係配置於該視認側。因此,視需要亦可對第1保護層12實施硬塗處理、抗反射處理、抗黏附處理、防眩處理等表面處理。進而/或者,視需要亦可對第1保護層12實施改善介隔偏光太陽眼鏡進行視認之情形時之視認性的處理(具代表性而言,賦予(橢)圓偏光功能,賦予超高相位差)。藉由實施此種處理,即便於介隔偏光太陽眼鏡等偏光透鏡視認顯示畫面之情形時,亦可實現優異之視認性。因此,光學積層體亦可較佳地應用於可於室外使用之圖像顯示裝置。 關於第1保護層之厚度,只要可獲得上述所需之偏光板之厚度及與第2保護層之厚度之差,則可採用任意適當之厚度。第1保護層之厚度例如為10 μm~50 μm,較佳為15 μm~40 μm。再者,於實施有表面處理之情形時,第1保護層之厚度為包含表面處理層之厚度在內的厚度。 B-3.第2保護層 第2保護層13亦是由可用作偏光元件之保護層的任意適當之膜而形成。成為該膜之主成分之材料係如上述B-2項中關於第1保護層所作之說明。第2保護層13較佳為光學各向同性。於本說明書中,所謂「為光學各向同性」,係指面內相位差Re(550)為0 nm~10 nm,厚度方向之相位差Rth(550)為-10 nm~+10 nm。 第2保護層之厚度例如為15 μm~35 μm,較佳為20 μm~30 μm。第1保護層之厚度與第2保護層之厚度之差較佳為15 μm以下,更佳為10 μm以下。若厚度之差為此種範圍,則可良好地抑制貼合時之捲縮。第1保護層之厚度與第2保護層之厚度可相同,亦可使第1保護層較厚,亦可使第2保護層較厚。具代表性而言,第1保護層較第2保護層厚。 C.第1相位差層 C-1.第1相位差層之特性 第1相位差層20可根據目的而具有任意適當之光學特性及/或機械特性。第1相位差層20具代表性而言具有遲相軸。於一實施形態中,第1相位差層20之遲相軸與偏光元件11之吸收軸所成之角度較佳為10°~20°,更佳為13°~17°,進而較佳為約15°。若第1相位差層20之遲相軸與偏光元件11之吸收軸所成之角度為此種範圍,則藉由如下所述般將第1相位差層及第2相位差層之面內相位差分別設定為特定之範圍,並相對於偏光元件之吸收軸以特定之角度配置第2相位差層之遲相軸,可獲得於寬頻帶中具有非常優異之圓偏光特性(結果為非常優異之抗反射特性)之光學積層體。 第1相位差層較佳為折射率特性顯示nx>ny≧nz之關係。第1相位差層之面內相位差Re(550)較佳為180 nm~320 nm,更佳為200 nm~290 nm,進而較佳為230 nm~280 nm。再者,此處,「ny=nz」不僅包含ny與nz完全相等之情形,亦包含實質上相等之情形。因此,可於不損及本發明之效果之範圍內存在ny<nz之情形。 第1相位差層之Nz係數較佳為0.9~3,更佳為0.9~2.5,進而較佳為0.9~1.5,尤佳為0.9~1.3。藉由滿足此種關係,於將所獲得之光學積層體用於圖像顯示裝置之情形時,可達成非常優異之反射色相。 第1相位差層可顯示相位差值根據測定光之波長而變大之反分散波長特性,亦可顯示相位差值根據測定光之波長而變小之正波長分散特性,亦可顯示相位差值幾乎不因測定光之波長而變化之平坦之波長分散特性。於一實施形態中,第1相位差層顯示相位差值幾乎不因測定光之波長而變化之平坦之波長分散特性。於該情形時,相位差層之Re(450)/Re(550)較佳為0.99~1.03,Re(650)/Re(550)較佳為0.98~1.02。藉由將顯示平坦之波長分散特性且具有特定之面內相位差之第1相位差層與顯示平坦之波長分散特性且具有特定之面內相位差之第2相位差層以特定之遲相軸角度組合使用,可於寬頻帶中實現非常優異之抗反射特性。 第1相位差層包含光彈性係數之絕對值較佳為2×10-11
m2
/N以下、更佳為2.0×10-13
m2
/N~1.5×10-11
m2
/N、進而較佳為1.0×10-12
m2
/N~1.2×10-11
m2
/N之樹脂。若光彈性係數之絕對值為此種範圍,則於產生加熱時之收縮應力之情形時不易發生相位差變化。其結果,可良好地防止所獲得之圖像顯示裝置之熱不均。 C-2.包含樹脂膜之第1相位差層 於第1相位差層包含樹脂膜之情形時,其厚度較佳為60 μm以下,較佳為30 μm~50 μm。若第1相位差層之厚度為此種範圍,則可獲得所需之面內相位差。 第1相位差層20可包含可滿足上述C-1項所記載之特性之任意適當之樹脂膜。作為此種樹脂之代表例,可列舉環狀烯烴系樹脂、聚碳酸酯系樹脂、纖維素系樹脂、聚酯系樹脂、聚乙烯醇系樹脂、聚醯胺系樹脂、聚醯亞胺系樹脂、聚醚系樹脂、聚苯乙烯系樹脂、丙烯酸系樹脂。於第1相位差層包含顯示平坦之波長特性之樹脂膜之情形時,可較佳地使用環狀烯烴系樹脂。 環狀烯烴系樹脂係以環狀烯烴作為聚合單元進行聚合而成之樹脂之總稱,例如可列舉日本專利特開平1-240517號公報、日本專利特開平3-14882號公報、日本專利特開平3-122137號公報等中所記載之樹脂。作為具體例,可列舉:環狀烯烴之開環(共)聚合物,環狀烯烴之加成聚合物,環狀烯烴與乙烯、丙烯等α-烯烴之共聚物(具代表性而言為無規共聚物),及利用不飽和羧酸或其衍生物將其等改性而成之接枝改性物以及其等之氫化物。作為環狀烯烴之具體例,可列舉降烯系單體。作為降烯系單體,例如可列舉:降烯及其烷基及/或亞烷基取代物,例如5-甲基-2-降烯、5-二甲基-2-降烯、5-乙基-2-降烯、5-丁基-2-降烯、5-亞乙基-2-降烯等,該等之鹵素等之極性基取代物;二環戊二烯、2,3-二氫二環戊二烯等;二甲橋八氫萘、其烷基及/或亞烷基取代物、及鹵素等之極性基取代物,例如6-甲基-1,4:5,8-二甲橋-1,4,4a,5,6,7,8,8a-八氫萘、6-乙基-1,4:5,8-二甲橋-1,4,4a,5,6,7,8,8a-八氫萘、6-亞乙基-1,4:5,8-二甲橋-1,4,4a,5,6,7,8,8a-八氫萘、6-氯-1,4:5,8-二甲橋-1,4,4a,5,6,7,8,8a-八氫萘、6-氰基-1,4:5,8-二甲橋-1,4,4a,5,6,7,8,8a-八氫萘、6-吡啶基-1,4:5,8-二甲橋-1,4,4a,5,6,7,8,8a-八氫萘、6-甲氧基羰基-1,4:5,8-二甲橋-1,4,4a,5,6,7,8,8a-八氫萘等;環戊二烯之三~四聚物,例如4,9:5,8-二甲橋-3a,4,4a,5,8,8a,9,9a-八氫-1H-苯并茚、4,11:5,10:6,9-三甲橋-3a,4,4a,5,5a,6,9,9a,10,10a,11,11a-十二氫-1H-環戊并蒽等。 於本發明中,可於不損及本發明之目的之範圍內併用可開環聚合之其他環烯烴類。作為此種環烯烴之具體例,例如可列舉環戊烯、環辛烯、5,6-二氫二環戊二烯等具有1個反應性雙鍵之化合物。 上述環狀烯烴系樹脂之藉由利用甲苯溶劑之凝膠滲透層析(GPC)法所測得之數量平均分子量(Mn)較佳為25,000~200,000,進而較佳為30,000~100,000,最佳為40,000~80,000。若數量平均分子量為上述範圍,則製成機械強度優異且溶解性、成形性、流延之操作性較佳者。 於上述環狀烯烴系樹脂為將降烯系單體之開環聚合物氫化而獲得者之情形時,氫化率較佳為90%以上,進而較佳為95%以上,最佳為99%以上。若為此種範圍,則耐熱劣化性及耐光劣化性等優異。 作為上述環狀烯烴系樹脂膜,亦可使用市售之膜。作為具體例,可列舉:日本ZEON公司製造之商品名「ZEONEX」、「ZEONOR」,JSR公司製造之商品名「Arton」,TICONA公司製造之商品名「TOPAS」,三井化學公司製造之商品名「APEL」。 第1相位差層20例如係藉由將由上述環狀烯烴系樹脂所形成之膜進行延伸而獲得。作為由環狀烯烴系樹脂形成膜之方法,可採用任意適當之成形加工法。作為具體例,可列舉壓縮成形法、轉移成形法、射出成形法、擠出成形法、吹塑成形法、粉末成形法、FRP(Fiber Reinforced Plastic,纖維強化塑膠)成形法、澆鑄塗敷法(例如流延法)、壓延成形法、熱壓法等。較佳為擠出成形法或澆鑄塗敷法。其原因在於:可提高所獲得之膜之平滑性,獲得良好之光學均一性。成形條件可根據所使用之樹脂之組成或種類、相位差層所需之特性等而適當設定。再者,如上所述,環狀烯烴系樹脂係市售有大量之膜製品,故而亦可將該市售膜直接供於延伸處理。 樹脂膜(未延伸膜)之厚度可根據第1相位差層之所需之厚度、所需之光學特性、下述延伸條件等而設定為任意適當之值。較佳為50 μm~300 μm。 上述延伸可採用任意適當之延伸方法、延伸條件(例如延伸溫度、延伸倍率、延伸方向)。具體而言,可將自由端延伸、固定端延伸、自由端收縮、固定端收縮等各種延伸方法單獨使用,亦可同時或逐次使用。關於延伸方向,亦可於長度方向、寬度方向、厚度方向、傾斜方向等各種方向或維度進行。延伸之溫度相對於樹脂膜之玻璃轉移溫度(Tg)較佳為Tg-30℃~Tg+60℃,更佳為Tg-10℃~Tg+50℃。 藉由適當選擇上述延伸方法、延伸條件,可獲得具有上述所需之光學特性(例如折射率特性、面內相位差、Nz係數)之相位差膜。 於一實施形態中,相位差膜係藉由將樹脂膜進行單軸延伸或固定端單軸延伸而製作。作為固定端單軸延伸之具體例,可列舉一面使樹脂膜於長度方向上移動,一面於寬度方向(橫向)上將其延伸之方法。延伸倍率較佳為1.1倍~3.5倍。 於另一實施形態中,相位差膜可藉由將長條狀之樹脂膜於相對於長度方向成特定角度之方向上連續地傾斜延伸而製作。藉由採用傾斜延伸,可獲得具有相對於膜之長度方向成特定角度之配向角(於該角度之方向上具有遲相軸)的長條狀之延伸膜,例如與偏光元件積層時可實現輥對輥,從而可簡化製造步驟。再者,該角度可為光學積層體中偏光元件之吸收軸與第1相位差層之遲相軸所成之角度。如上所述,該角度較佳為10°~20°,更佳為13°~17°,進而較佳為約15°。 作為傾斜延伸中所使用之延伸機,例如可列舉可於橫向及/或縱向上施加速度左右不同之傳送力或拉伸力或牽引力之拉幅式延伸機。拉幅式延伸機中存在橫向單軸延伸機、同時雙軸延伸機等,只要可將長條狀之樹脂膜連續地傾斜延伸,則可使用任意適當之延伸機。 藉由在上述延伸機中分別適當地控制左右之速度,可獲得具有上述所需之面內相位差且於上述所需之方向上具有遲相軸之第1相位差層(實質上為長條狀之相位差膜)。 上述膜之延伸溫度可根據第1相位差層所需之面內相位差值及厚度、所使用之樹脂之種類、所使用之膜之厚度、延伸倍率等而變化。具體而言,延伸溫度較佳為Tg-30℃~Tg+30℃,進而較佳為Tg-15℃~Tg+15℃,最佳為Tg-10℃~Tg+10℃。藉由在此種溫度下進行延伸,於本發明中可獲得具有適當特性之第1相位差層。再者,Tg係膜之構成材料之玻璃轉移溫度。 C-3.包含液晶化合物之配向固化層之第1相位差層 第1相位差層20亦可為液晶化合物之配向固化層。藉由使用液晶化合物,可使所獲得之相位差層之nx與ny之差與非液晶材料相比顯著增大,故而可將用以獲得所需之面內相位差之第1相位差層之厚度顯著減小。其結果,可實現光學積層體之進一步之薄型化。於第1相位差層20包含液晶化合物之配向固化層之情形時,其厚度較佳為1 μm~7 μm,更佳為1.5 μm~2.5 μm。藉由使用液晶化合物,能以與樹脂膜相比顯著薄之厚度實現與樹脂膜同等之面內相位差。 於本說明書中,所謂「配向固化層」,係指液晶化合物於層內沿特定之方向配向且其配向狀態經固定之層。再者,「配向固化層」係包含如下所述般使液晶單體硬化而獲得之配向硬化層之概念。於本實施形態中,具代表性而言,棒狀之液晶化合物以沿第1相位差層之遲相軸方向排列之狀態配向(水平配向)。作為液晶化合物,例如可列舉液晶相為向列相之液晶化合物(向列液晶)。作為此種液晶化合物,例如可使用液晶聚合物或液晶單體。液晶化合物之液晶性之表現機制可為溶致性液晶與熱致性液晶之任一種。液晶聚合物及液晶單體可分別單獨使用,亦可組合。 於液晶化合物為液晶單體之情形時,該液晶單體較佳為聚合性單體及交聯性單體。其原因在於:藉由使液晶單體聚合或交聯(即硬化),可將液晶單體之配向狀態固定。於使液晶單體配向後,例如若使液晶單體彼此聚合或交聯,則藉此可將上述配向狀態固定。此處,藉由聚合而形成聚合物,藉由交聯而形成三維網狀結構,但該等為非液晶性。因此,所形成之第1相位差層不會發生例如液晶性化合物所特有之因溫度變化而引起之向液晶相、玻璃相、結晶相之轉移。其結果,第1相位差層成為不受溫度變化影響之穩定性極其優異之相位差層。 液晶單體顯示液晶性之溫度範圍根據其種類而不同。具體而言,該溫度範圍較佳為40℃~120℃,進而較佳為50℃~100℃,最佳為60℃~90℃。 作為上述液晶單體,可採用任意適當之液晶單體。例如可使用日本專利特表2002-533742(WO00/37585)、EP358208(US5211877)、EP66137(US4388453)、WO93/22397、EP0261712、DE19504224、DE4408171、及GB2280445等中所記載之聚合性液晶原基化合物等。作為此種聚合性液晶原基化合物之具體例,例如可列舉BASF公司之商品名LC242、Merck公司之商品名E7、Wacker-Chem公司之商品名LC-Sillicon-CC3767。作為液晶單體,例如較佳為向列性液晶單體。 液晶化合物之配向固化層可藉由如下方式形成:對特定之基材之表面實施配向處理,於該表面塗敷包含液晶化合物之塗敷液並使該液晶化合物沿與上述配向處理對應之方向配向,將該配向狀態固定。藉由使用此種配向處理,可使液晶化合物相對於長條狀基材之長條方向沿特定之方向配向,結果,可使遲相軸於所形成之相位差層之特定方向上顯現。例如,可於長條狀之基材上形成於相對於長條方向成15°之方向上具有遲相軸之相位差層。此種相位差層即便於需要於傾斜方向上具有遲相軸之情形時,亦可使用輥對輥進行積層,故而光學積層體之生產性可顯著提高。於一實施形態中,基材為任意適當之樹脂膜,形成於該基材上之配向固化層可轉印至偏光板10之表面。於另一實施形態中,基材可為第2保護層13。於該情形時,可省略轉印步驟,於形成配向固化層(第1相位差層)後連續地藉由輥對輥進行積層,故而生產性進一步提高。 作為上述配向處理,可採用任意適當之配向處理。具體而言,可列舉機械性之配向處理、物理性之配向處理、化學性之配向處理。作為機械性之配向處理之具體例,可列舉摩擦處理、延伸處理。作為物理性之配向處理之具體例,可列舉磁場配向處理、電場配向處理。作為化學性之配向處理之具體例,可列舉斜向蒸鍍法、光配向處理。關於各種配向處理之處理條件,可根據目的採用任意適當之條件。 液晶化合物之配向係藉由根據液晶化合物之種類於顯示液晶相之溫度下進行處理而進行。藉由進行此種溫度處理,液晶化合物成為液晶狀態,該液晶化合物對應於基材表面之配向處理方向而配向。 於一實施形態中,配向狀態之固定係藉由將如上所述般經配向之液晶化合物冷卻而進行。於液晶化合物為聚合性單體或交聯性單體之情形時,配向狀態之固定係藉由對如上所述般經配向之液晶化合物實施聚合處理或交聯處理而進行。 液晶化合物之具體例及配向固化層之形成方法之詳細內容係記載於日本專利特開2006-163343號公報中。該公報之記載係以參考之形式引用至本說明書中。 D.第2相位差層 D-1.第2相位差層之特性 第2相位差層30可根據目的而具有任意適當之光學特性及/或機械特性。第2相位差層30具代表性而言具有遲相軸。於一實施形態中,第2相位差層30之遲相軸與偏光元件11之吸收軸所成之角度較佳為65°~85°,更佳為72°~78°,進而較佳為約75°。第2相位差層30之遲相軸與第1相位差層20之遲相軸所成之角度較佳為52°~68°,更佳為57°~63°,進而較佳為約60°。若第2相位差層30之遲相軸與偏光元件11之吸收軸所成之角度為此種範圍,則藉由如上所述般將第1相位差層之面內相位差設定為特定之範圍,並相對於偏光元件之吸收軸以特定之角度配置第1相位差層之遲相軸,且如下所述般將第2相位差層之面內相位差設定為特定之範圍,可獲得於寬頻帶中具有非常優異之圓偏光特性(結果為非常優異之抗反射特性)之光學積層體。 第2相位差層較佳為折射率特性顯示nx>ny≧nz之關係。第2相位差層之面內相位差Re(550)較佳為80 nm~200 nm,更佳為100 nm~180 nm,進而較佳為110 nm~170 nm。 第2相位差層之其他特性係如上述C-1項中關於第1相位差層所作之說明。 D-2.包含樹脂膜之第2相位差層 於第2相位差層包含樹脂膜之情形時,其厚度較佳為40 μm以下,較佳為25 μm~35 μm。若第2相位差層之厚度為此種範圍,則可獲得所需之面內相位差。於第2相位差層包含樹脂膜之情形時,其材料、特性、製造方法等係如上述C-2項中關於第1相位差層所作之說明。 D-3.包含液晶化合物之配向固化層之第2相位差層 第2相位差層30亦可與第1相位差層同樣地為液晶化合物之配向固化層。於第2相位差層30包含液晶化合物之配向固化層之情形時,其厚度較佳為0.5 μm~2 μm,更佳為1 μm~1.5 μm。於第2相位差層包含液晶化合物之配向固化層之情形時,其材料、特性、製造方法等係如上述C-3項中關於第1相位差層所作之說明。 D-4.第1相位差層與第2相位差層之組合 第1相位差層及第2相位差層能以任意適當之組合之形式使用。具體而言,可為第1相位差層包含樹脂膜,第2相位差層包含液晶化合物之配向固化層;亦可為第1相位差層包含液晶化合物之配向固化層,第2相位差層包含樹脂膜;亦可為第1相位差層及第2相位差層均包含樹脂膜;亦可為第1相位差層及第2相位差層均包含液晶化合物之配向固化層。較佳為於第1相位差層包含樹脂膜之情形時,第2相位差層亦包含樹脂膜;於第1相位差層包含液晶化合物之配向固化層之情形時,第2相位差層亦包含液晶化合物之配向固化層。再者,於第1相位差層及第2相位差層均包含樹脂膜之情形時,第1相位差層及第2相位差層可相同,亦可使詳細之構成不同。第1相位差層及第2相位差層均包含液晶化合物之配向固化層之情形時亦同樣。 於第1相位差層及第2相位差層均包含樹脂膜之情形時,第2相位差層之尺寸變化率較佳為1%以下,更佳為0.95%以下。第2相位差層之尺寸變化率越小越佳。第2相位差層之尺寸變化率之下限例如為0.01%。若第2相位差層之尺寸變化率為此種範圍,則可顯著地抑制高溫高濕下之導電層產生龜裂。 於第1相位差層及第2相位差層均包含液晶化合物之配向固化層之情形時,偏光板、第1相位差層及第2相位差層之積層體之尺寸變化率較佳為1%以下,更佳為0.95%以下。該積層體之尺寸變化率越小越佳。該積層體之尺寸變化率之下限例如為0.01%。若該積層體之尺寸變化率為此種範圍,則可顯著地抑制高溫高濕下之導電層產生龜裂。 E.黏著劑層 黏著劑層只要滿足上述A項中所記載之構成及特性,則可包含任意適當之黏著劑。換言之,黏著劑只要滿足上述A項中所記載之構成及特性,則可含有任意適當之黏著性聚合物。作為黏著性聚合物,就容易取得黏著性能之平衡之觀點而言,較佳為Tg為0℃以下(通常-100℃以上)之聚合物。此種聚合物中,可較佳地使用聚酯系聚合物、(甲基)丙烯酸系聚合物。 作為聚酯系聚合物,具代表性而言可使用多元醇與多元羧酸之飽和聚酯或共聚酯。作為多元醇,例如可列舉:乙二醇、丙二醇、六亞甲二醇、新戊二醇、1,2-環己烷二甲醇、1,4-環己烷二甲醇、十亞甲二醇、1,3-丙二醇、1,4-丁二醇、1,5-戊二醇、1,6-己二醇、2,2-雙(4-羥基苯基)丙烷、雙(4-羥基苯基)碸等二醇。作為多元羧酸,例如可列舉:對苯二甲酸、間苯二甲酸、鄰苯二甲酸、2,5-萘二甲酸、2,6-萘二甲酸、1,4-萘二甲酸、1,5-萘二甲酸、二苯基羧酸、二苯氧基乙烷二羧酸、二苯基碸羧酸、蒽二甲酸等芳香族二羧酸;1,3-環戊烷二羧酸、1,3-環己烷二羧酸、1,4-環己烷二羧酸、六氫對苯二甲酸、六氫間苯二甲酸等脂環族二羧酸;丙二酸、二甲基丙二酸、丁二酸、3,3-二乙基丁二酸、戊二酸、2,2-二甲基戊二酸、己二酸、2-甲基己二酸、三甲基己二酸、庚二酸、壬二酸、二聚酸、癸二酸、辛二酸、十二烷二羧酸等脂肪族二羧酸。作為多元羧酸,大多情況下併用2種以上之多元羧酸,例如芳香族二羧酸與脂肪族二羧酸。 作為構成聚酯系聚合物之單體中之酸成分,例如可列舉3元以上之多羧酸。作為具體例,可列舉:1,2,4-苯三甲酸(偏苯三甲酸)、2,5,7-萘三甲酸等三羧酸;均苯四甲酸等四羧酸。 如上述A項中所記載,構成聚酯系聚合物之所有單體成分中之酸成分之量未達4重量%,較佳為0~3重量%,更佳為0~2重量%,進而較佳為0~1重量%,尤佳為實質上為零。若酸成分之量為此種範圍,則酸成分對導電層之不良影響減小至可忽視之程度,結果為可於高溫高濕下顯著地抑制導電層產生龜裂。 (甲基)丙烯酸系聚合物通常作為單體單元而含有(甲基)丙烯酸烷基酯作為主成分。作為構成(甲基)丙烯酸系聚合物之主骨架之(甲基)丙烯酸烷基酯,可例示直鏈狀或分支鏈狀之烷基之碳數1~18者。該等可單獨或組合而使用。該等烷基之平均碳數較佳為3~9。又,可使用(甲基)丙烯酸苯氧基乙酯、(甲基)丙烯酸苄酯般之含有芳香族環之(甲基)丙烯酸烷基酯。含有芳香族環之(甲基)丙烯酸烷基酯可將使其聚合而成之聚合物混合至上述例示之(甲基)丙烯酸系聚合物中而使用,亦可與上述(甲基)丙烯酸烷基酯進行共聚而使用。就透明性之觀點而言,較佳為共聚。 上述(甲基)丙烯酸系聚合物中,為了改善接著性或耐熱性,亦可藉由共聚而導入具有聚合性官能基(例如(甲基)丙烯醯基或乙烯基等不飽和雙鍵)之1種以上之共聚單體。 作為構成(甲基)丙烯酸系聚合物之單體中之酸成分,可列舉為上述共聚單體且具有酸基之單體。作為具體例,可列舉:丙烯酸、(甲基)丙烯酸、(甲基)丙烯酸羧基乙酯、(甲基)丙烯酸羧基戊酯、亞甲基丁二酸、順丁烯二酸、反丁烯二酸、丁烯酸等含羧基單體;順丁烯二酸酐、亞甲基丁二酸酐等含酸酐基單體;丙烯酸之己內酯加成物;苯乙烯磺酸或烯丙基磺酸、2-(甲基)丙烯醯胺-2-甲基丙磺酸、(甲基)丙烯醯胺丙磺酸、(甲基)丙烯酸磺丙酯、(甲基)丙烯醯氧基萘磺酸等含磺酸基單體;丙烯醯基磷酸2-羥基乙酯等含磷酸基單體。作為酸成分,就酸之不良影響較少之觀點而言,較佳為作為弱酸之含羧基單體。 亦可藉由共聚而於上述(甲基)丙烯酸系聚合物中導入上述共聚單體以外之任意適當之共聚單體。此種共聚單體之種類、數量、共聚比等可根據目的而適當設定。 (甲基)丙烯酸系聚合物可為無規共聚物、嵌段共聚物、接枝共聚物之任一者。 如上述A項中所記載,構成(甲基)丙烯酸系聚合物之所有單體成分中之酸成分之量未達4重量%,較佳為0~3重量%,更佳為0~2重量%,進而較佳為0~1重量%,尤佳為實質上為零。若酸成分之量為此種範圍,則酸成分對導電層之不良影響減小至可忽視之程度,結果為可於高溫高濕下顯著地抑制導電層產生龜裂。 黏著劑中可含有交聯劑。作為交聯劑,可使用有機系交聯劑或多官能性金屬螯合物。作為有機系交聯劑,可列舉異氰酸酯系交聯劑、過氧化物系交聯劑、環氧系交聯劑、亞胺系交聯劑等。多官能性金屬螯合物係多價金屬與有機化合物進行共價鍵結或配位鍵結而成者。作為多價金屬原子,可列舉Al、Cr、Zr、Co、Cu、Fe、Ni、V、Zn、In、Ca、Mg、Mn、Y、Ce、Sr、Ba、Mo、La、Sn、Ti等。作為進行共價鍵結或配位鍵結之有機化合物中之原子,可列舉氧原子等,作為有機化合物,可列舉烷基酯、醇化合物、羧酸化合物、醚化合物、酮化合物等。作為交聯劑,較佳為異氰酸酯系交聯劑及過氧化物系交聯劑。 作為異氰酸酯系交聯劑,例如可列舉:甲苯二異氰酸酯、氯苯二異氰酸酯、四亞甲基二異氰酸酯、苯二甲基二異氰酸酯、二苯基甲烷二異氰酸酯、經氫化之二苯基甲烷二異氰酸酯等異氰酸酯單體及將該等異氰酸酯單體與三羥甲基丙烷等進行加成而成之異氰酸酯化合物或異氰尿酸酯化物,縮二脲型化合物,以及與聚醚多元醇或聚酯多元醇、丙烯酸多元醇、聚丁二烯多元醇、聚異戊二烯多元醇等進行加成反應而成之胺基甲酸酯預聚物型異氰酸酯。 作為過氧化物系交聯劑,只要為藉由加熱或光照射而產生自由基活性種而使黏著劑之基質聚合物進行交聯者,則可使用任意適當者。若考慮作業性及穩定性,則過氧化物系交聯劑之1分鐘半衰期溫度較佳為80℃~160℃,更佳為90℃~140℃。作為可用作交聯劑之過氧化物之具體例,可列舉:過氧化二碳酸二(2-乙基己基)酯(1分鐘半衰期溫度:90.6℃)、過氧化二碳酸二(4-第三丁基環己基)酯(1分鐘半衰期溫度:92.1℃)、過氧化二碳酸二第二丁酯(1分鐘半衰期溫度:92.4℃)、過氧化新癸酸第三丁酯(1分鐘半衰期溫度:103.5℃)、過氧化特戊酸第三己酯(1分鐘半衰期溫度:109.1℃)、過氧化特戊酸第三丁酯(1分鐘半衰期溫度:110.3℃)、過氧化二月桂醯(1分鐘半衰期溫度:116.4℃)、過氧化二正辛醯(1分鐘半衰期溫度:117.4℃)、過氧化2-乙基己酸1,1,3,3-四甲基丁酯(1分鐘半衰期溫度:124.3℃)、過氧化二(4-甲基苯甲醯)(1分鐘半衰期溫度:128.2℃)、過氧化二苯甲醯(1分鐘半衰期溫度:130.0℃)、過氧化異丁酸第三丁酯(1分鐘半衰期溫度:136.1℃)、1,1-二(過氧化第三己基)環己烷(1分鐘半衰期溫度:149.2℃)。 黏著劑中可調配矽烷偶合劑作為添加劑。作為矽烷偶合劑,例如可列舉:3-縮水甘油氧基丙基三甲氧基矽烷、3-縮水甘油氧基丙基甲基二甲氧基矽烷、2-(3,4-環氧環己基)乙基三甲氧基矽烷等具有環氧結構之矽化合物;3-胺基丙基三甲氧基矽烷、N-(2-胺基乙基)3-胺基丙基三甲氧基矽烷、N-(2-胺基乙基)3-胺基丙基甲基二甲氧基矽烷等含胺基矽化合物;3-氯丙基三甲氧基矽烷;含乙醯乙醯基之三甲氧基矽烷、3-丙烯醯氧基丙基三甲氧基矽烷、3-甲基丙烯醯氧基丙基三乙氧基矽烷等含(甲基)丙烯酸基之矽烷偶合劑;3-異氰酸酯基丙基三乙氧基矽烷等含異氰酸酯基之矽烷偶合劑。 關於黏著劑之詳細內容,例如係記載於日本專利特開2012-247517號公報之[0023]~[0080]。該公報之記載係以參考之形式引用至本說明書中。 藉由調整構成黏著性聚合物之單體成分之種類、數量、共聚比、交聯劑之種類、添加劑之種類、數量、調配量等(尤其是單體成分中之酸成分之量),可獲得具有所需之特性(尤其是高溫高濕下之導電層之抗龜裂特性)之黏著劑。 黏著劑層40之厚度較佳為5 μm~30 μm,更佳為5 μm~20 μm。 F.導電層或附有基材之導電層 導電層可藉由任意適當之成膜方法(例如真空蒸鍍法、濺鍍法、CVD(Chemical Vapor Deposition,化學氣相沈積)法、離子鍍覆法、噴霧法等)於任意適當之基材上形成金屬氧化物膜而形成。成膜後視需要亦可進行加熱處理(例如100℃~200℃)。藉由進行加熱處理,非晶質膜可結晶化。作為金屬氧化物,例如可列舉氧化銦、氧化錫、氧化鋅、銦-錫複合氧化物、錫-銻複合氧化物、鋅-鋁複合氧化物、銦-鋅複合氧化物。銦氧化物中亦可摻雜有2價金屬離子或4價金屬離子。較佳為銦系複合氧化物,更佳為銦-錫複合氧化物(ITO)。銦系複合氧化物具有於可見光區域(380 nm~780 nm)中具有較高之透過率(例如80%以上)且每單位面積之表面電阻值較低之特徵。 於導電層包含金屬氧化物之情形時,該導電層之厚度較佳為50 nm以下,更佳為35 nm以下。導電層之厚度之下限較佳為10 nm。 導電層之表面電阻值較佳為300 Ω/□以下,更佳為150 Ω/□以下,進而較佳為100 Ω/□以下。 導電層可自上述基材轉印至第2相位差層上而以單獨之導電層之形式成為光學積層體之構成層,亦可以與基材之積層體(附有基材之導電層)之形式積層於第2相位差層上。 作為構成基材之材料,可列舉任意適當之樹脂。較佳為透明性優異之樹脂。作為具體例,可列舉環狀烯烴系樹脂、聚碳酸酯系樹脂、纖維素系樹脂、聚酯系樹脂、丙烯酸系樹脂。 較佳為上述基材為光學各向同性,因此導電層能以附有各向同性基材之導電層之形式用於光學積層體中。作為構成光學各向同性之基材(各向同性基材)之材料,例如可列舉:以降烯系樹脂或烯烴系樹脂等不具有共軛系之樹脂作為主骨架之材料、於丙烯酸系樹脂之主鏈中具有內酯環或戊二醯亞胺環等環狀結構之材料等。若使用此種材料,則於形成各向同性基材時,可將伴隨分子鏈之配向的相位差之表現抑制為較小。 基材之厚度較佳為10 μm~200 μm,更佳為20 μm~60 μm。 基材之透濕度為5 mg/m2
・24 h~10 mg/m2
・24 h,較佳為6 mg/m2
・24 h~9 mg/m2
・24 h,更佳為7 mg/m2
・24 h~8 mg/m2
・24 h。基材之尺寸變化率為0.3%以下,較佳為0.1%以下,更佳為0.05%以下。進而,基材之線膨脹係數為6(×10-6
/℃)~9(×10-6
/℃),較佳為7(×10-6
/℃)~8(×10-6
/℃)。若基材之上述特性為此種範圍,則可顯著地抑制高溫高濕下之導電層產生龜裂。再者,透濕度可依據JIS Z0208之透濕度試驗(杯式法)而確定。線膨脹係數可藉由依據JIS K 7197之TMA(thermomechanical analysis,熱機械分析)測定而確定。 上述導電層及/或上述附有導電層之各向同性基材之導電層視需要可圖案化。藉由圖案化,可形成導通部及絕緣部。作為圖案化方法,可採用任意適當之方法。作為圖案化方法之具體例,可列舉濕式蝕刻法、網版印刷法。 視需要亦可於導電層51與基材52之間設置硬塗層(未圖示)。作為硬塗層,可使用任意之具有適當構成之硬塗層。硬塗層之厚度例如為0.5 μm~2 μm。只要霧度為容許範圍,則亦可於硬塗層中添加用以減少牛頓環之微粒子。進而,視需要亦可於導電層51與基材52(於存在之情形時為硬塗層)之間設置用以提高導電層之密接性之增黏塗層、及/或用以調整反射率之折射率調整層。作為增黏塗層及折射率調整層,可採用任意適當之構成。增黏塗層及折射率調整層可為數奈米~數十奈米之薄層。 視需要亦可於基材52之與導電層相反之側(光學積層體之最外側)設置另一硬塗層。具代表性而言,該硬塗層包含黏合劑樹脂層及球狀粒子,球狀粒子自黏合劑樹脂層突出而形成凸部。此種硬塗層之詳細內容係記載於日本專利特開2013-145547號公報中,該公報之記載係以參考之形式引用至本說明書中。 G.其他 本發明之實施形態之光學積層體亦可進而包含其他相位差層。其他相位差層之光學特性(例如折射率特性、面內相位差、Nz係數量、光彈性係數)、厚度、配置位置等可根據目的而適當設定。 就實用而言,於導電層50(於存在之情形時為導電層之基材52)之表面設置有用以貼合於顯示單元之黏著劑層(未圖示)。較佳為於該黏著劑層之表面貼合有剝離膜直至將光學積層體供於使用。 H.圖像顯示裝置 上述A項~G項所記載之光學積層體可應用於圖像顯示裝置。因此,本發明包含使用此種光學積層體之圖像顯示裝置。作為圖像顯示裝置之代表例,可列舉液晶顯示裝置、有機EL顯示裝置。本發明之實施形態之圖像顯示裝置於其視認側具備上述A項~G項所記載之光學積層體。光學積層體係以導電層成為顯示單元(例如液晶單元、有機EL單元)側之方式(偏光元件成為視認側之方式)積層。即,本發明之實施形態之圖像顯示裝置可為於顯示單元(例如液晶單元、有機EL單元)與偏光板之間組入有觸控感測器之所謂之內觸控面板型輸入顯示裝置。於該情形時,觸控感測器可配置於導電層(或附有基材之導電層)與顯示單元之間。關於觸控感測器之構成,可採用業界周知之構成,故而省略詳細之說明。 [實施例] 以下,藉由實施例對本發明具體地進行說明,但本發明不受該等實施例之限定。再者,各特性之測定方法如下所述。 (1)厚度 對於塗佈形成之相位差層(液晶化合物之配向固化層),使用大塚電子製造之MCPD2000藉由干涉膜厚測定法進行測定。對於其他膜,使用數位式測微計(Anritsu公司製造之KC-351C)進行測定。 (2)相位差層之相位差值 利用自動雙折射測定裝置(王子計測機器股份有限公司製造,自動雙折射計KOBRA-WPR)測量實施例及比較例中所使用之相位差層之折射率nx、ny及nz。面內相位差Re之測定波長為450 nm及550 nm,厚度方向相位差Rth之測定波長為550 nm,測定溫度為23℃。 (3)儲存彈性模數 使用Rheometric公司製造之動態黏彈性測定裝置「ARES」根據JIS K 7244對實施例及比較例中所使用之黏著劑層測定85℃下之儲存彈性模數。 (4)相位差層或光學積層體之尺寸變化率 將實施例及比較例中所使用之相位差層或實施例及比較例中所獲得之光學積層體以100 mm×100 mm切出而作為測定試樣。測定將該測定試樣於溫度85℃及相對濕度85%之烘箱中保管240小時後之尺寸,將與卷之長條方向正交之方向上的與投入烘箱前之尺寸相比的變化率作為尺寸變化率。 (5)光學積層體之耐久性 將實施例及比較例中所獲得之光學積層體以100 mm×50 mm切出,貼合於無鹼玻璃而作為測定試樣。將該測定試樣於溫度85℃及相對濕度85%之烘箱中保管120小時。其後,將測定試樣自烘箱中取出,利用雷射顯微鏡觀察導電層之狀態,以如下基準進行評價。 良好:未確認到龜裂 不良:明顯確認到龜裂 [參考例1:偏光板之製作] 對於厚度30 μm之聚乙烯醇(PVA)系樹脂膜(Kuraray製造,製品名「PE3000」)之長條卷,一面利用輥延伸機以於長條方向上成為5.9倍之方式於長條方向上進行單軸延伸,一面同時實施膨潤、染色、交聯、洗淨處理,最後實施乾燥處理,藉此製作厚度12 μm之偏光元件1。 具體而言,膨潤處理係一面於20℃之純水中進行處理一面延伸至2.2倍。繼而,染色處理係一面於以所獲得之偏光元件之單體透過率成為45.0%之方式調整了碘濃度的碘與碘化鉀之重量比為1:7之30℃之水溶液中進行處理一面延伸至1.4倍。進而,交聯處理係採用2階段之交聯處理,第一階段之交聯處理係一面於40℃之溶解有硼酸與碘化鉀之水溶液中進行處理一面延伸至1.2倍。第一階段之交聯處理之水溶液之硼酸含量為5.0重量%,碘化鉀含量係設為3.0重量%。第二階段之交聯處理係一面於65℃之溶解有硼酸與碘化鉀之水溶液中進行處理一面延伸至1.6倍。第二階段之交聯處理之水溶液之硼酸含量為4.3重量%,碘化鉀含量係設為5.0重量%。又,洗淨處理係於20℃之碘化鉀水溶液中進行處理。洗淨處理之水溶液之碘化鉀含量係設為2.6重量%。最後,乾燥處理係於70℃下乾燥5分鐘而獲得偏光元件1。 於所獲得之偏光元件1之兩面,經由聚乙烯醇系接著劑分別貼合Konica Minolta股份有限公司製造之TAC膜(製品名:KC2UA,厚度:25 μm,對應於第2保護層)及於該TAC膜之單面具有藉由硬塗處理而形成之硬塗(HC)層之HC-TAC膜(厚度:32 μm,對應於第1保護層),獲得具有第1保護層/偏光元件1/第2保護層之構成之偏光板1。 [參考例2:構成第1相位差層之液晶配向固化層之製作] 將顯示向列液晶相之聚合性液晶(BASF公司製造:商品名「Paliocolor LC242」,由下述式表示)10 g與針對該聚合性液晶化合物之光聚合起始劑(BASF公司製造:商品名「Irgacure907」)3 g溶解於甲苯40 g中,製備液晶組合物(塗敷液)。 [化1]使用摩擦布將聚對苯二甲酸乙二酯(PET)膜(厚度38 μm)表面摩擦而實施配向處理。關於配向處理之條件,摩擦次數(摩擦輥個數)為1,摩擦輥半徑r為76.89 mm,摩擦輥轉數nr為1500 rpm,膜搬送速度v為83 mm/sec,關於摩擦強度RS及壓入量M,於如表1所示之5種條件(a)~(e)下進行。 [表1]
10‧‧‧偏光板10‧‧‧ polarizing plate
11‧‧‧偏光元件11‧‧‧ polarizing element
12‧‧‧第1保護層12‧‧‧1st protective layer
13‧‧‧第2保護層13‧‧‧ 2nd protective layer
20‧‧‧第1相位差層20‧‧‧ the first phase difference layer
30‧‧‧第2相位差層30‧‧‧ 2nd phase difference layer
40‧‧‧黏著劑層40‧‧‧Adhesive layer
50‧‧‧導電層50‧‧‧ conductive layer
51‧‧‧導電層51‧‧‧ conductive layer
52‧‧‧基材52‧‧‧ Substrate
100‧‧‧光學積層體100‧‧‧ Optical Laminate
圖1係本發明之一實施形態之光學積層體之概略剖視圖。FIG. 1 is a schematic cross-sectional view of an optical multilayer body according to an embodiment of the present invention.
Claims (7)
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