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TW200817181A - Manufacturing method of multilayer laminated film - Google Patents

Manufacturing method of multilayer laminated film Download PDF

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Publication number
TW200817181A
TW200817181A TW96121454A TW96121454A TW200817181A TW 200817181 A TW200817181 A TW 200817181A TW 96121454 A TW96121454 A TW 96121454A TW 96121454 A TW96121454 A TW 96121454A TW 200817181 A TW200817181 A TW 200817181A
Authority
TW
Taiwan
Prior art keywords
film
layer
elastic
roller
resin
Prior art date
Application number
TW96121454A
Other languages
English (en)
Other versions
TWI441733B (zh
Inventor
Yutaka Fujita
Kazuki Tsuchimoto
Morimasa Wada
Tomoyuki Senoo
Takafumi Ooura
Kentarou Ikeshima
Tomoaki Masuda
Original Assignee
Nitto Denko Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Publication of TW200817181A publication Critical patent/TW200817181A/zh
Application granted granted Critical
Publication of TWI441733B publication Critical patent/TWI441733B/zh

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45Joining of substantially the whole surface of the articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4825Pressure sensitive adhesives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/342Preventing air-inclusions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7332General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being coloured
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • B29C66/73366General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light both parts to be joined being transparent or translucent to visible light
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7338General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being polarising
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/83General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
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    • Y10T156/00Adhesive bonding and miscellaneous chemical manufacture
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    • Y10T156/1702For plural parts or plural areas of single part
    • Y10T156/1712Indefinite or running length work
    • Y10T156/1741Progressive continuous bonding press [e.g., roll couples]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)

Description

200817181 九、發明說明: 【發明所屬之技術領域】 本發明係關於一種於水分率為10〜6〇重量%之樹脂薄膜 之兩面’經由接著層或黏著層而貼合水分率為0.5〜5重量% 之第一及第二透明薄膜之多層層疊膜之製造方法。 本發明之製造方法可應用於各種多層層疊膜之製造,例 如可於使用偏光膜作為樹脂薄膜、使用偏光膜用之透明保 護薄膜作為透明薄膜來製造偏光板之方法中使用。此外 亦可用於製造食品、醫療儀器等之包裝中所使用 声 疊膜。 曰 【先前技術】 自,前以來,於樹脂薄膜之兩面貼合透明薄膜而製造多 層層璺膜時,通常使用水系接荖 矛接者^或黏者劑。作為於樹脂 面貼合透明薄膜之方法’例如可採用於一對輕間 輸送樹脂薄膜,並且向其 ^ ^ ± β 、币面上輪达並同時貼合透明薄膜 °時層豐法;於—對輕間輸送透明薄膜’並且向立一面 上輸送並貼合透明薄膜後,接著於樹脂薄膜之另一面上貼 合透明薄膜之逐次層疊法。 、 /然而,利用上述層疊法’於貼合樹脂薄膜與透明薄膜 日可,所獲得之多層声晶臌士 ^ 、 吝p、/ 層層宜膜中之樹脂薄膜與透明薄膜之間會 广’ °另外’會產生皺褶或生成條紋狀之凹凸不均。 針對上㈣褶之產生等相關課題,提出有以特定 壓而貼合樹脂薄膜(含水率為 寺 m 〜2()4量%之聚乙稀醇系薄 膑)與透明薄膜(纖維素系 、)之方法(專利文獻1)。然 121806.doc 200817181 即使利用έ亥方法,亦無法充分地抑制於多廣層疊膜中 之樹脂薄膜與透明薄膜之間所產生之氣泡。 專利文獻1:日本專利特開平ι〇_166519號公報 【發明内容】 [發明所欲解決之問題]
本ι明之目的在於提供一種多層層疊膜之製造方法,其 係於樹脂薄膜上貼合透明薄膜之多層層疊膜之製造方法, 其可抑制於樹脂薄膜與透明薄膜之間所產生之氣泡,並且 可抑制皺褶或條紋狀凹凸不均之產生。 [解決問題之技術手段] 本發明人等為了解決上述課題而進行積極研究,結果發 現利用以下所示之多層層疊膜之製造方法可實現上述目 的,以至完成本發明。 本發明係關於一種多層層疊膜之製造方法,其係於水分 率為!0〜60重量%之樹脂薄膜之兩面,經由接著層或黏著 層而貼合水分率為0.5〜5重量%之第—透明薄膜及第二透明 薄膜之多層層疊膜之製造方法,其特徵在於, 2照第-透明薄膜位於第-金屬輥側之方式使樹脂薄旗 於第-透明薄膜通過第一金屬輥與第一彈性輥該一對賴 間,藉此壓接而形成層疊膜之後, 並不捲取該層疊膜,按照第二透明篷 逍明潯Μ位於第二金屬朝 側之方式使該層疊膜與第二透明薄膜 一 碍胰通過弟二金屬輥盥驾 二彈性輥該-對概間’藉此壓接而形成多層層叠膜/、 上述多層層疊膜之製造方法中,較
予乂对的疋弟一金屬輥I 121806.doc 200817181 第:金屬親之至少任一者為鐵轉或 上述多層層疊膜之製造方 ^ 第二彈性輕均為於金屬製芯部二交:的是第-彈性輳及 得之彈性親。上述第-彈性較及^佈橡膠層或樹脂層而獲 層或樹脂層之硬度為70以上1〇()以下—蜂性輕較好的是橡谬 上述多層層疊膜之製造方法中 變形凹部端點虛夕切始杈好的疋弟一弹性輥之 I鈿2處之切線與樹脂薄 (eia)、和 媒之輸运線所成之角度 =:生輥之變形凹部端點處之切線與第 輸达線所成之角度(01b), 寻m之 相對於第一彈性鈕掛 向。 〜形凹部端點處之切線為相反方. 其中,第-彈性輥之變形凹部端點 觸擠壓第一彈性輥而產生之第_彈、由弟1屬輥接 η斗 彈生秦之變形凹部處的箆· -舞性輕與第一金屬輕之最開始接觸點。 w的弟 樹脂薄膜之輸送線係指樹 接觸點處之切線。 …、弟—無性輥之最開始 第-透明薄膜之輪送線係指第一透 之最開始接觸點處之切線。 〃弟至屬輥 上述多層層疊膜之製造方法中可且 於將樹脂薄膜θ^ g ’、 °機構,該機構 之前’改變第-彈性親之變形凹部端點處::輸, 膜之輸送線所成之角度(…)。 、、Ό月曰薄 上述多層層疊膜之製造方法中,較好的是第二彈性幸昆之變 12I806.doc 200817181 形凹部端點處之切線與層疊狀輸送線所叙肖度⑽&)、和 第二彈性輕之變形凹部端點處之切線與第二透 輸送線所成之角度(e2b), 、 相對於第二彈性輕之變形凹部端點處之切線為相反方 向0 其中’第二彈性輥之變形凹部端點係指由第 觸擠壓第二彈性輥而產生之第二 ^ - Hy , > 布坪注祝之蜒形凹部處的第 一弹性輥_第二金屬輥之最開始接觸點。 層疊膜之輸送線制層疊膜與第二彈性輥 點處之切線。 取開始接觸 第二透明薄膜之輸送線係指第二透明薄膜與第二金屬輕 之最開始接觸點處之切線。 上述多層層疊膜之製造方法中具有 將声晶膜6楚入s 有女下枝構,該機構於 :u膑向弟二金屬報與第二彈性轉該一對輥間輸送之 則,改變弟二彈性輕之變形凹部端點處之切線與層 輸送線所成之角度(θ2α)者。 I、 上述多層層疊膜之製造方法中,較好的是第一金屬輕盘 弟一彈性_之層㈣力及第二金屬輥與第:彈性輕門: 層豐遷力之至少任-者為2 MPa以上5 Mpa以下。 [發明之效果] 上述本發明之多層層疊膜之製造方法採用逐次声 並於貼合各薄膜時使用組合彈性親與金屬幸昆該-㈣Γ。並 且’於貼合樹脂薄膜與透明薄膜時’或者將貼 膜與透明薄膜之層疊膜中之榭i 丨月曰潯 膜中之树月曰賴側與透明薄膜進行貼 121806.doc 200817181 。% ’均以透明薄膜位於金屬輥側之方式使之通過。利用 純之組金㈣不會接觸含水之樹脂薄膜,並且利用 彈性輕之彈性力使樹脂薄膜與透明薄難合
於樹脂薄膜與透明薄膜夕4产 pfJ 处乃溥Μ之間所產生之氣泡,且可製造多層 層疊膜。另外,亦可抑制產生皺㈣生成條紋狀之凹凸; 均0 於上述本發明之多層層疊膜之製造方法中,對所輸送之
各薄膜之角度進行控制,使樹脂薄膜之輸送角度與第 山透明薄膜之輸送角度(嶋)相對於第—彈性輥之變形凹部 处之切線成為相反方向,另外使層疊膜之輸送角度 與第:透明薄膜之輸送角度_)相對於第二彈性二 、义^/凹邛端點處之切線成為相反方向,藉此可將樹脂薄 ' 了第=透月薄膜之最開始接觸時期或層疊膜與第二透明 薄膜之最開始接觸時期、各薄膜由輥進行壓接之時期的時 間控制成較短,可進一步抑制於樹脂薄膜與透明薄膜之間 所產生之氣泡。 —上述夕層層豐膜之製造方法適用於使用偏光膜作為樹脂 溥膜、使用偏光膜用之透明保護薄膜作為透明薄膜來製造 偏光板之方法中。可獲得各薄膜間不會產生氣泡,另外不 會產生皺稽或條紋狀凹&不均之外觀良好之偏光板。該偏 光板之面内均勻性優良,析像度高,並且可實現高對比度 之液晶顯示裝置(LCD)、電致發光顯示裝置(eld)等圖像= 示裝置。 【實施方式】 12I806.doc 10 200817181 以下參照圖式,說明本發明之多層層疊膜之製造方法。 圖1為表示本發明之多層層疊膜之製造方法之二例之圖, 百先,使樹脂薄膜Α與第一透明薄膜B1通過第—彈性輥以 與第一金屬輥bl該-對輕間,藉此壓接而形成層疊膜^。 於上述-對較中,樹脂薄膜A位於第—彈性輥U側,另 外^第―透明薄細位於第一金屬輥…則。接著,不捲取 層豎膜’而使層4心(樹脂薄膜A側)與第二透明薄膜扣 通過第二金屬_與第二彈性親a2該一對親間,藉此壓接 而形成多層層疊膜L2。多層層疊膜L2於樹脂薄膜A之兩面 具有第-透明薄膜m及第二透明薄膜於。於上述一對輥 中’層疊膜u位於第二彈性輥心側,另一方面,第二透明 薄膜B2位於第二金屬輥匕側。 =卜’於圖1中,於向第-彈性_第-金屬輥Μ該 輥間輸送樹脂薄膜Α之前,設置有樹脂薄膜 :變:構Ml。另外,於向第二彈性㈣與第二金屬㈣2 ::::Γ輸送層疊膜L1之前,設置有層疊心之角度改 交機構M2。利用角度改變機播 構1可控制進入第一彈性輥 :弟-金屬輕Μ之間之樹脂薄膜八之角度。另 角度改變機構Μ2可控制進入第二彈性㈣與第二金屬輥 之間之樹脂薄膜Lg . 中 、、又。角度改變機構Ml、M2於圖1 中…員不為一對輥,於圖1中 述進入角度。 "使/、左右移動而控制上 於第一彈性輕al與第—金屬輥μ該一對輕間,經 或黏著劑(未圖示)而貼合樹脂薄膜A與第一透明 I21806.doc 200817181 透、。上述接著層或黏著層可設置於樹月旨薄膜歧第一 透明薄膜m之至少任一者一側,另外,亦可㈣ 臈A與第-透明薄細臨前,與已調節漢“曰著 劑(溶液)或黏著劑(溶液卜起,通過第 d接者 入碎+ 坪性親al盘第一 i屬輥一對輥間’藉此壓接。同樣 : 與第二金屬輥b2該一對輥間,經由接 比心 不)而貼合層疊膜L1與第二透明薄㈣。: 著層既可設置於第二透明薄膜B2 曰或4 疊膜U與第二透明薄靡2臨前,盘己二二可於貼合層 屬秦b b2该一對輥間,藉此壓接。 適材貝、輕直控、貼合時之輸送速度等進行 =二外’亦可適當調節接著層或黏著層之厚度。 使用:八㈣al、第二彈性心,例如可較好地 作^ 芯部塗佈有橡膠層或樹脂層之彈性轉。 更好車乂好的是使用70以上者, 外,進而較好的是使用85以上者。另 好的止薄膜表面受到損傷,較好的是⑽以下,更 二=以下。作為此時之硬度,例如可利請 以253(1997)中所揭示之方 測定。再者,就表面壓力分布之均;;售方之面硬度計㈣)來 或樹月旨層之厚度較好的是卜15 方面而言,橡勝層 3, _左右。第一彈性轉 工右,進而較好的是 可不同。 弟二彈性輥a2既可相同亦 】21806.doc 200817181 作為上述第一金屬輥bl、第二金屬輥b2 列|料 心衬科,例如可 、线、不銹鋼、鈦、銘等。作為今屬 果為孟屬輥,就相對費用效 金屬!J疋鐵龟或不銹鋼輥。第一 屬糕bl、弟二金屬輥b2既可相同亦可不同。 為上述各親之直徑,由於直徑越小,樹脂薄膜 故而=明薄膜B1或第二透„咖接觸之面積越小, 一 ^溥膑面施加之壓力相對變高。因此,作 徑,較好的是使用25〇 mm以者,的… ^ ^ 4琨而更好的是使用200 。其中’若該直徑過小,則輥之耐久性會變 =而=法施加充分之力,故而較好的是使用5G軸以上 之龟,更好的是使用〗〇〇 mm以上之輥。 另外,對貼合時之輸送速度並無特別限制,通常較好的 是於2 m/分鐘〜5〇m/分鐘左右調節。 另外’對貼合時之㈣之層㈣力並無特別限制,可適 f設定。就調節之容易度或多層層疊膜之生產率方面而 $ ’層疊塵力較好的是2MPa以上5奶以下左右,更好的 是3 MPa以上4 MPa以下。若層疊塵力小於2奶,則無法 充分地擠壓’故而會於薄膜間產生氣泡。另外,若層羼壓 力大於5 MPa,則對輥或裝置施加之負荷會過大,=為 破損之原因。層疊塵力之測定係使用富士朦片公司製造之 感屢紙「Prescale」,藉由計算機圖像處理使該感塵紙之顏 色變化二值化,而對於其顯色面積及濃度,根據所製作之 壓力標準線之近似式進行求得。 如圖2A所示,於上述多層層疊膜之製造方法中,較好的 121806.doc 200817181 =樹脂薄膜A之輸送角度㈣與第—透明薄 角度(eib)控制成,相對於第— ▲ 季比a 1之變形凹部端零占X ] 處之切線yl為相反方向。即,較 鳊•,占X1 A山 好的疋弟一彈性輥al之變 Γ找點X1處之切_與樹脂薄膜A之輸送線所成之角 =和切線yl與第一透明薄_之輸送線所 (eib),相對於切線yl為相反 角又 Λ . 猎此’可以將樹脂薄膜 A與弟一透明薄膜扪之最開始 、 2〇〇 ^ ^ , 牧綱日f期和該等薄膜由第一 :進:一金編接之時期的時間控制為較短,藉 產二:與第—透明薄膜B1之間所 產生的就泡。上述角度(eia)之控制可利 機構Ml進行。 ㈤ 角度控制 圖2 A中’第一彈性輥a 1之 輥U由第-金屬輥Μ接觸擠 ㈣係指弟一彈性 凹㈣處的第一彈性親_第_產八生;^一彈性報之變形 (旋轉方向之最開始之接觸外屬Μ之最開始接觸點 線係指樹脂薄膜八與第一二^ 绩“…… 輥al之最開始接觸點處之切 線(所輸达之樹腊薄膜A之延長線上 刀 輸送線係指第一透明 一 ^㈣膜 私拉細机a 7、乐 金屬輥b 1之最開 始接觸點處之切線(所輸 之線)。 (厅翰迗之弟一透明薄膜m之延長線上 圖2A中,關於角声μ
φ 角又()、角度(eib),若以切線ylAA 「_」之角声目, 疋表不為「-」,則角度(eia)若為 产特別限制。角度_若為「+」之角 度則亚無特別限制0 12l806.doc -14- 200817181 ;V中關於圖2A ’提及有樹脂薄膜A之輸送角度 透明溥膜之輸送角度(Θ11>),同樣,如圖2B 所不亦可對層疊膜L1之輸送角度(02a)與第二透明薄膜 B2之輸送角度(e2b)加以控制,藉此進一步抑制層疊膜u 中之樹脂薄膜A與第二透明薄膜幻之間所產生之氣泡。上 述角度(θ2α)之控制可利用圖1之角度控制機構M2進行。 :a中一關於角度_)、角度(0213),若以切線72為基 厂表7^為+」、左旋表示為「-」’則角度(02a)若為 、+」,則並無特別限制。角度(02b)若為「」之角度,則 並無特別限制。 & 、 八=明之多層層疊膜之製造方法中所使用之樹脂薄膜水 10〜60重量%。本發明中較好的是所應用之樹脂薄 膜之水/刀率為15〜50重量%,更好的是20〜40重量%。另一 2,第-及第二透明薄膜之水分率為05〜5重量%。本發 :乂好的是所應用之上述透明薄膜之水分率為!〜3重量 =再者帛&第—透明薄膜之材料既可相同亦可;f :二=:率既可相同亦可不同。再者,於多層層疊 Γ:=Γ,形成接著層或黏著層之材料可根據所使 用之树月曰薄膜、透明薄膜而適當確定。 明=二使用偏光膜作為樹脂薄膜,使用偏光膜用之透 4、作為相㈣,經 合,從而製造偏光板之情況加以說明。 /、貼 聚偏::’通常使用對聚乙稀醇(PVA)系薄膜等 承合物薄膜以碘或二色性 才 巴! 生木枓4二色性物質進行染色 121806.doc 15 200817181 軸拉伸之薄膜。對此種偏光膜之厚度並無特別限制,通常 使用5〜80 μπι左右、較好的是為4〇 μπι以下者。
作為偏光膜之特性,用偏光膜單體測定時之單體透過率 較好的是40%以上,更好的是處於42〜45%之範圍。另外, 準備兩張上述偏光膜,以兩張偏光膜之吸收軸相互呈9〇。 之方式進行重疊所測定之正交透過率較好的是更小,實際 使用時較好的是請%以上〇,㈣%以了,更好的是G 〇3〇: 以下。作為偏光度’實際使用時較好的是99 9㈣以上 100❶/。以下’特別好的是99.93%以上100%以下。作為偏光 板進行測定時,亦較好的是獲得與其大致相同之光學 性。 作為形成偏光膜之聚合物薄膜’並無特別限制,可使用 各種薄膜。例如 '可列舉對聚乙烯醇(PVA)系薄膜、聚對 苯二甲酸乙二醇醋㈣)系薄膜、乙浠·乙酸乙職共聚物 t薄膜或該等之部分息化薄膜、纖維素系薄膜等親水性高 /刀子薄膜進行PVA之脫水處理物或聚氯乙浠之脫鹽酸處理 物等多稀系配向薄膜等。其+,就利用破等二色性物質所 物之染色性優良方面而言,較好的是使用隱系薄膜。 作為上述聚合物簿艘:> 4 ⑽ ㈣之材料的聚合物之聚合度通常為 铋好的疋1000〜6000之範 1400〜4000之範圍。進而, 的疋 . 、皂化薄膜之情形時,例如就 對水之溶解性方面而言,复 皂化度較好的是75莫耳%以 上,更好的是98莫耳%以上, 莫耳%之範圍。 好的是處於98,3〜99.8 121806.doc • 16 · 200817181 於使用隱系薄膜作為上述聚合物_ PVA系薄膜之f芒方、本 ^ ^ 丨月形時,作為 迈方法,可適當使用將溶 劑中之原液進行流延成膜之流延法 、良或有機溶 意方法成膜之镇瞪„ 去、擠出法等任 成膜之格。較好的是使用此 ⑽〜100 _之薄臈。 位差值為5 較好的是PVA"膜“獲付面内均勾之偏光膜, 疋1八糸/專膜面内之相位差不均盡
系薄膜之面内相位罢 b小者,PVA 差不均於檢測波為10〇〇 nm 10⑽以下,更好的是5nm以下。 f車乂好的疋 為貼合偏光膜與透明保護薄膜時之偏光 右水矢率為10〜60重量%, 刀率, 製成偏光板時容易產生心、、’'”、、別限定’若過低,則 若過玄,ί,Γ 狀之凹凸不均或氣泡,相反, 门則而要長時間之乾燥時間,要长逬1 備。因眇,从& 要衣過大之乾燥設 作為於偏光膜上貼合透明伴 之水分率,較Μ〜 4料之偏光膜 ㈣ 50重量❶更好的是20〜40重量 /〇。此種偏光膜之水分 里 乾燥卢偏光膜製造步驟中之 ^ 條件進行調節,亦可根據兩# # & ^1* 理步驟,實施向水”之、、,、、c要另外设置調濕處 乾燥或減麗乾燥。㈣或水紅謂或者再次加熱 ::=膜之製造方法’並非限定於此,通常可 為乾式拉伸法與濕式拉伸法。 之偏光膜之R牛驟π j用濕式拉伸法所進行 、^驟’可根據其條件,使用適當之方法, 、吊為稭由例如包括膨潤、 乾焊声押此 ]木色、父聯、拉伸、水洗以及 、去 /驟之一系列製造步驟而製造上述偏光臈之方 除了乾燥處理步驟以外,於該等各處理步驟中,一邊 121806.doc 200817181 久=於包含各種溶液之浴中’ 一邊進行處理。對此時之 理^理步驟中之膨潤、染色、交聯、水洗以及乾燥之各處 順序、次數以及實施之有無並無特別限定,既可於一 二處理步驟中同時進行幾個處理’亦可不進行幾個處遂。 !色°广,處理既可於染色處理之後進行,亦可與膨潤或 二:理同時進行,或者亦可於拉伸處理之後進行染色處 理之方t ’亦較好以使用於拉伸處理之前後進行交聯處 適另::’作為拉伸處理’並無特別限定,可使用 餘伸之情料,可❹㈣輥間之 、:二速度差進行拉伸之方法。進而,於各處理中亦可 之顯、硼砂料化料添 膜中,根攄STI介可八士 於偏九 #據而要亦可含有侧酸、硫酸辞、氯化辞或块化卸 二進二’於該等幾個處理中既可適當向縱向或寬度方向 亦可於各處理中進行水洗處理。 作為膨潤處理步驟,例士 注滿之處理浴(膨潤浴)::=, 洗聚合物薄膜表面之污垢或^2洗4合物薄膜,可清 聚人物笼瞄_ 4抗站連劑,並且可期待藉由使 :;=τ而防止染色不均等不均勻性之效果。於該 好的是甘、由L可番適當添加甘油或硬化卸等,添加之濃度較 、、谷之… 以下、碘化鉀為10重量%以下。膨湖 左右,於膨潤浴中之浸潰時— 之拉伸㈣為’亦可於該膨潤浴中拉伸聚合物薄膜,此時 之拉伸倍率為丨.1〜3.5倍左右。 作為染色處理步。驟,彳f 1 〇可列舉藉由將上述聚合物薄膜 121806.doc 200817181 /叉/貝於含有碟等二色性物質之處理浴(染色浴)中而進行染 色方法作為上述二色性物質,可使用先前眾所周知之 貝例如可列舉碘或有機染料等。作為有機染料,例如 可使用紅BR、紅LR、紅R '粉LB、玉紅bl、棗紅GS、天 藍LG、檸檬黃、藍色BR、藍色2r、藏青ry、綠色^、紫 色LB、紫色B、黑色H、黑色β、黑色Gsp、黃色犯、黃色 浐色LR板色3R、猩紅GL、猩紅、剛果紅、亮紫 时、蘇普拉藍G、蘇普拉藍见、蘇普拉檀gl、直接天 直接永固S、决151垔楚 ms 人 …、等。该等二色性物質既可使用 可併用兩種以上。其中,於本發明中,就偏光度 ^子’性優良、容易獲得本發明之條紋狀凹凸不均之降 低效果方面而言,較好的是使用碘。 劑浴:溶液’可使用將上述二色性物質溶解於溶 二中::液。作為溶劑’通常使用純水等水, ::與水有相溶性之有機溶劑。作為二色性物質之濃度, 、:·_〜H)重量%左右。對聚合物薄膜於 潰時間並盔特別. 卞巴♦ f之汉 —;、Γ:: 0分鐘左右, 面之處理:驟?:浴中亦可拉伸聚合物薄膜,與前 倍左右4中之拉伸倍率累計之累積拉伸倍率紅 另外使用碘作為上述二 色效率方面而t,較好的…二沈可進一步提高染 物。作為該诚化物,_ L 中進一步添加碟化 ,、化物,例如可列舉碘化 納、碘化鋅、碘化鋁π 、 峨化 /、化錯、碘化鋼、碘化鎖、蛾化 U1806.doc -19- 200817181 錫、硬化鐵等。該等蛾化物之添 色冷中為〇._〜10重量%左右即可 ^ 蛐化鈿Λ, 丨J其中,較好的是添加 :圍,〜、碟化鉀之比例(重量比)較好的是於1:5七00 圍。進而’以提高薄膜面内之均勾性 ▲添加硼化合物等交聯劑。 方了適 之=以Γ染色處理’除了浸潰於如上所述之染色浴中 佈或嘖•上例如既可使用將含有二色性物質之水溶液塗 =1務於上述聚合物薄膜上之方法,亦可使 &物薄膜製膜時預先混合二色性物質之方法。 作為2處理於含有交聯狀處 使用先前眾所周知之物質。二作聯劑,可 合物或乙4、列舉職、卿等蝴化 種以上。併用兩為一種,亦可併用兩 人 m如較好的Μ酸與蝴砂之組 比例(莫耳%比)為4:6〜9:1左右。作為交 之有機::::ί常使用純水等水’亦可含有與水有相溶性 ή。父聯浴中之交聯劑濃度為卜 t偏先膜之面内均勻特性方面而言, 交聯劑中添加碘化物。作 、上述 鉀、班化# 作為该碘化物,例如可列舉碘化 銅、…、-化舞、丄 化錯、峨化 〇〇5 15#θ〇 、 碘化錫、碘化鐵,其含量為 是於Hi 135且° ’蝴酸與蛾化鉀之比例(重量比)較好的 1:3.5之範圍,更好的是社g.5〜1:2.5之範圍。 121806.doc •20- 200817181 溫度通常為20〜抓,浸潰時間通常為1秒〜15分 二二進二交聯處理與染色處理同樣,既可使用塗佈 伸處理::時:Γ之方法,亦可與交聯處理同時實施拉 、 夺之累積拉伸倍率為U〜3·5倍左右。 處1=1 處理步驟’於濕式拉伸法之情形時,於浸潰於 拉伸洛)中之狀態下,拉伸^ h & 倍左右。作AM 租㈣累積拉伸倍率為2〜7 作為拉伸浴之溶液,較好的是使用 各種有機溶劑等溶劑中 、乙知或 化合物之溶、“1 屬鹽、礙1或鋅之 ……其中’較好的是使用分別以2〜18重量%左 右添加棚西參;^ /斗、& μ k ^ ^ 或/、化卸之溶液。於同時 化鉀之情形時,A f使用相S夂與埃 七八3有比例(重s比)較好的是1:0.^.4左 右。该拉伸浴之溫度較好的是4〇〜π左右。 .左 聚先處理步驟,:如藉由於處理浴(水洗浴)中浸潰 之产疒物、了冼去於別面之處理中附著之硼酸等不需要 之夂存物。於上述水溶 是J AW碘化物,例如較好的 =硬化納或靖。水洗浴之溫度為 是適,r= 定,可實施複數次,較好的 疋:田调即各水洗浴中之添加物之種類或濃度。 者’自各處理浴中提出聚合 滴落之發生,既可使用先前眾所周知之文夺::防止液體 亦可藉去火㈣4除液親, .% ± 之方法除去多餘之水分。 作為乾燥處理步驟,可使用自 乾燥等先前眾所周知之木运風乾魅、加熱 加熱溫度為20〜8。。。左右二例如’於加熱乾 左右“時間為H〇分鐘左右。另 Ϊ 21806.doc 200817181 外、隹於該Μ處理步驟中’亦可適當進行拉伸。 、而,猎由上述處理步驟而獲得之 率(總拉伸倍率)較好的是3 一拉伸倍率^^ 難以獲得高偏光度 未滿‘時, 裂。 元膜右起過7倍’則薄膜容易破 偏光膜之製造方法並不限定於上述製造方 滿足水分率為} 〇〜6〇重 使用其它製造方法製 ; 例# ’亦可為乾式拉伸法,或於聚對苯二甲酸 乙一醇酯(PET)等聚合物薄膜中撈 · ㈣膜中祝入-色性物質後進行製 仆 可列舉將於單軸方向配向之液晶作為主 〇叫、於其中將二色性物f作為f (guest)之類之〇 (美國專利W3號,日本專利特表平3伽奶虎公 報)’使用二色性溶致液晶等之E型方法(美 6,049,428 號公報)。 作為上述透明保護薄膜,以保護偏光膜為目的,故而較 好的?透明性、機械強度、熱穩定性、各向同性等方面優 良之薄膜。透明保護薄膜之厚度通常較好的是i〜则陶左 右’更好的是5〜!()〇_左右。另外,就提高偏光特性或耐 久性以及接著特性等方面而t ’亦可藉由電暈處理、電漿 處理、火焰處理、臭氧處理、底塗處理、輝光處理、皂化 處理對透明保護薄膜表面進行表面改性處理。該等表面改 性處理中,較好的是用鹼等進行皂化處理。若按照溫度 4〇°C、相對濕度90%下之JIS z〇2〇8(杯式法)測定此種透明 保護薄膜之透濕率,則為〇 5〜5000 g/m2.24 h左右。 121806.doc -22- 200817181 作為形成透明保護薄 酸乙二醇醋、聚萘二〒酸 2,例如可列舉聚對苯二甲 醯纖維素或三乙醒纖維素等纖維素日系聚合物,二乙 酸甲酯等丙烯酸系聚合物 ……物,聚尹基兩烯 聚物陶賴睛-苯乙歸共 外,作.為形成上述保護薄膜之 反“曰糸聚合物。另 烯、聚丙烯、且有環“咚 之例,亦可舉例聚乙 /、句%糸或降冰片榼 丙烯共聚物之類之聚稀煙系聚、、'口構之聚婦煙、乙烯-龍或芳香族聚醯胺等酿胺系产 T乙埽系聚合物,尼 系聚合物,聚醚砜李聚入物勿’醯亞胺系聚合物,颯 鳴合物,乙烯基醇系聚合物,偏氣:::二聚苯疏 烯丁 I系聚合物,芳自旨系聚 甲物,乙 佥取人,, 切 \ ψ龄糸聚合物 系“物’或者上述聚合物之摻合物 4 亦可含有1種以上任意之適當添加劑。作為夭=薄膜中 灣紫外線吸收劑、抗氧化劑、潤滑 ;: ϋ月保㈣膜中之上述熱塑性樹脂 一重量%,更好的一重量%,進而較 6〇’重量%,特別好的是7〇〜97重量%。透明保護薄膜; 之上述熱塑性樹脂之含量為50重量%以下之情形時,可处 無法充分地表現出㉟塑性樹脂本來具有之高透明性等I月" 另外,作為透明保護薄膜,可列舉如曰本專利特門 2〇〇 1 -343529號公報(W0 01/37〇〇7)中揭示之上述聚合物: 膜,例如可列舉包含(A)側鏈上具有取代及/或未取代醯亞 121806.doc -23 - 200817181 胺基之熱塑性樹脂、以及(B)側鏈上具有取代及/或未取代 苯基及腈基之熱塑性樹脂的樹脂組合物。作為具體例,可 列舉含有包含異丁烤與N-甲基順丁烯二醯亞⑯之交替共聚 物及丙烯腈-苯乙烯共聚物的樹脂組合物之薄臈。薄膜可 使用由樹脂組合物之混合擠塵製品等構成之薄膜。該等薄 膜之相位差較小,且光彈性模量較小,故而能夠消除偏光 板之應變所造成之不均等不良情況,另外因其透濕度較 小,故加濕耐久性優良。 將該保護薄膜貼合於偏光膜之兩面時,亦可於其每一面 上使用具有彼此不同之特性之保護薄膜。作為其特性,例 如可列舉厚度、材質、透光率、拉伸彈性模量或光學功能 層之有無等。 匕作為本發明之透明保護薄膜,較好的是使用自纖維素樹 月曰(聚合物)、聚碳酸酯樹脂(聚合物)、環狀聚烯烴樹脂(且 有環系或降冰片稀結構之聚烯烴)及(甲基)丙婦酸樹脂中選 1之至少一種。使用包含三乙醯纖維素之保護薄膜之情形 時,本發明之效果特別顯著。 =素樹脂為纖維素與脂肪酸之醋。作為此種纖維素能 二“日之具體例’可列舉三乙醯纖維素、二乙醢纖維素、 二丙醯纖維素、二丙 ㈣維去 内西"義維素專。其中,特別好的是三乙 =素。三乙醯纖維素有很多製品出售,於 可列兴舍工聊 乍為二乙酏纖維素之市售品之例, 牛田乡片公司製造之商品名「UV-50」、「UV, I80」、「瓜_」、「觀AC」、「UZ-TAC」或 121806.doc -24- 200817181 KONICA公司製造之「KC系列」等。通常該等三乙醯纖維 素’面内相位差(Re)大致為〇,厚度方向相位差(Rth)具有 約60 nm左右。
再者,厚度方向相位差較小之纖維素樹脂,例如可藉由 處理上述纖維素樹脂而獲得。例如可列舉將塗佈有環戊 酉同、甲基乙基酮等溶劑之聚對苯二甲酸乙二醇酯、聚丙 烯、苯乙烯等基材薄膜貼合於通常之纖維素系薄膜上,加 熱乾燥(例如於80〜150。(:加熱3〜10分鐘左右)後,剝離基材 薄膜之方法;將於環戊酮、曱基乙基酮等溶劑中溶解有降 冰片燦系樹脂、(曱基)丙烯酸系樹脂等之溶液塗佈於通常 之纖維素樹脂薄膜上,加熱乾燥(例如於8〇〜15(rc加熱 3〜10分鐘左右)後,剝離塗佈薄膜之方法等。 另外,作為厚度方向相位差較小之纖維素樹脂,可使用 控制了脂肪取代度之脂肪酸纖維素系樹脂薄膜。於通常使 用之三乙醯纖維素中,通過乙酸取代度為28左右,較好 :是控制為!.8〜2.7’藉此可以減小Rth。藉由於上述脂肪 =取代纖維素系樹脂中添加鄰苯:甲酸二丁自旨、對甲苯# 酿笨胺、檸檬酸乙醯三乙酯等 八 曰寻刁塑劑,可以控制Rth為較 :、值:相對於100重量份脂肪酸纖維素系樹月旨,可塑劑之 添加里較好的是40重量份以下,更 又野的疋1〜20重量份,進 而較好的是1〜15重量份。 月匕=狀聚稀㈣"旨之具體例,較好的是降冰片稀系樹 之曰朽月烯烴系㈣係將環狀㈣作為聚合單元而聚合 …總稱,例如,可列舉曰本專利特開平】德!7號 】21806.doc -25· 200817181 公報、曰本專利特開平3_14882號公報、 7號公報等所揭示之樹脂專::千3- 烯炉之關谖^ w 、體例,可列舉環狀 r^ <加來物、環狀蝉烴與 乙焯、丙烯專烯烴之共聚物(代表性# & & ^ ^ ^ K观1 n表11的為無規共聚物)及 用不飽#耗或其衍生物使 ^ ^ ^ ^ ,又接技共聚物、以及 该專之虱化物等。作為環狀烯烴之具體 烯系單體。 夕J牛ρ牛冰片
作為環狀聚烯煙樹脂,有多種製品出售。作為具體例, :列舉曰本zeon股份有限公司製造之商品名 ZEONEX」、「ZE〇N〇R」、微股份有限公司製造之商品 名「ART⑽」、TIC〇NA公司製造之商品名「T〇pAs」、三 井化學股份有限公司製造之商品名「ApEL」。 作為(甲基)丙烯酸系樹脂,Tg(玻璃轉移溫度)較好的是 5 C以上,更好的是120 C以上,進而較好的是125。〇以 上,特別好的是13(TC以上。藉由使巧為115。(:以上,可使 偏光板之耐久性優良。對上述(甲基)丙烤酸系樹脂之Tg之 上限值並無特別限定,就成形性之觀點而言,較好的是 170°C以下。由(曱基)丙烯酸系樹脂,可獲得面内相位差 (Re)、厚度方向相位差(Rth)大致為〇之薄膜。 作為(甲基)丙細酸系樹脂,於不損及本發明之效果之範 圍内,可採用任意適當之(甲基)丙烯酸系樹脂。例如可列 舉♦甲基丙稀酸甲酯等聚(甲基)丙浠酸酯、甲基丙浠酸甲 酯_(甲基)丙稀酸共聚物、甲基丙烯酸甲酯_(甲基)丙烯酸酯 共聚物、甲基丙燁酸甲酯-丙烯酸酯_(曱基)丙烯酸共聚 121806.doc -26- 200817181 物、(甲基)丙烯酸甲酯-苯乙烯共聚物(MS樹脂等)、具有月匕 環族烴基之聚合物(例如甲基丙烯酸曱酯-甲基丙稀於产已 醋共聚物、甲基丙烯酸甲酯曱基)丙烯酸降冰片稀醋共聚 物等)。較好的是列舉聚(曱基)丙烯酸曱g旨等聚(甲基)丙稀 酸C1〜6烷基酯。更好的是列舉以曱基丙烯酸甲酯為主要成 分(50〜100重量% ’較好的是7〇〜1〇〇重量%)之曱基丙烯酸 甲酯系樹脂。
作為(甲基)丙烯酸系樹脂之具體例,例如可列舉三菱
rayon股份有限公司製造之Acrypet VH或VRL 2〇A、日本專利特開2〇〇4_7〇296號公報中揭*之分子内且 有環結構之(甲基)丙烯酸系樹脂、利用分子内交聯或分; 内環化反應而獲得之高Tg(甲基)丙《樹月曰、系。 作為(甲基)丙烯酸系樹月旨,亦可使用具有内醋環結構之 (甲基)丙埽酸系樹脂。其原因在於,具有高耐熱性、高透 明性、利用雙軸拉伸之高機械強度。 作為具有内S旨環結構( W # \ rr w .^ 稱之(甲基)丙蝉酸系樹脂,可列舉曰 =利特開尊230016號公報、日本專利特開则- 專幻牲Μ公報、日本專利特開咖2-120326號公報、日本 專利特開2002-254544號公報、n 士击 日本專利特開2005-146084 脂。 /、内§曰衣結構之(f基)丙烯酸系樹 之(甲基)丙烯酸系樹脂 示之環結構。 較好的是具有 具有内酯環結構 以下述通式(化1)表 [化1] 121806.doc *27- 200817181
式中,R、R及R分別獨立,表示氫原子或碳原子數為 1〜20之有機殘基。再者,有機殘基亦可包括氧原子。 具有内酯環結構之(甲基)丙烯酸系樹脂之結構中,以通 式(化1)表示之内醋環結構之含有比例較好的是5〜90重量 %,更好的是10〜70重量%,進而較好的是1〇〜6〇重量%, 特別好的是10〜50重量%。具有内醋環結構之(甲基)丙稀酸 系樹脂之結構中’以通式(化υ表示之内醋環結構之含有比 例若小於5重量%,則耐熱性、耐溶劑性、表面硬度可能 會變得不充分。具有㈣環結構之(甲基)丙烯酸系樹脂之 結構中,以通式(化1)表示之㈣環結構之含有比例若多於 9〇重量%,則可能會變得缺乏成形加工性。 具有内酯環結構之(甲基)丙烯酸系樹脂之質量平均分子 量(有時亦稱為重量平均分子量)較好的&〇〇〇.〇〇〇〇〇, 更好的是5000〜丨〇〇〇〇〇〇,進而較好的是1〇〇〇〇〜5〇〇〇〇〇,特 別好的是50000〜500000。若皙吾正认\ 右貝里千均分子量超出上述範 圍’則就成型加工性方面而言,並非較好。 具有内酯環結構之(曱基)丙烯酸系樹脂,以較好的是 115°CJ^,更好的是120°c以上’進而較好的⑽C以 上’特別好的是130。(:以上。由於Tg41150c以上,故而例 如作為透明保護薄膜組人至於偏光板之情形時,則成為耐 久性優良之偏光板。對上述具有㈣環結構之(甲基)丙歸 I2I806.doc •28- 200817181 酸系樹脂之Tg之上限值並無特別限定,就成形性等觀點而 言,較好的是170°C以下。 具有内酯環結構之(甲基)丙烯酸系樹脂藉由射出成形而 獲得之成形品,利用基於ASTM-D-1003之方法所測定之總 光線透過率越高越好,較好的是85%以上,更好的是88〇/〇 以上,進而較好的是9〇%以上。總光線透過率為透明性之 基準’若總光線透過率未滿85%,則透明性可能會降低。
上述透明保護薄膜通常使用正面相位差未滿4〇 且厚 度方向相位差未滿80随者。正面相位差RewRp(nx_ ny>d表示。厚度方向相位差Rth以Rth气nx_nz)xd表示。另 外,Nz係數以Nz=(nx_nz)/(nx_ny)表示。[其中,薄膜之滞 相軸方向、進向軸方向以及厚度方向之折射率分別為⑽、 y Z d (nm)為薄膜之厚度;滯相軸方向為薄膜面内之 折射率最大之方向]。#者,彡明保€薄膜較好的是盡可 能不著色。可較好地使用厚度方向之相位差值為_9〇 麵〜+75 nm之保護薄膜。藉由使用該厚度方向之相位差值 (趟)為-90 nm〜+75 nm之保護薄膜,可基本消除透明保護 薄膜引起之偏光板之著色(光學性著色)。厚度方向相位差 值(Rth)進而較好的是_8〇請〜+6〇聰 nm〜+45 nm。 特別好的是-70 另-方面’作為上述透明保護薄膜,可使用具有正面相 位差為40 nm以上及/或厘声士 & k μ 飞与度方向相位差為80 nmW上的相 位差之相位差板。正面相位差通常控制於4〇〜· _之範 圍,厚度方向相位差通常控制於8〇〜300 nm之範圍。使用 121806.doc •29· 200817181 相位差板作為透明保護薄膜之情形時,該相位差板亦起到 透明保護薄膜之功能,故而可實現薄型化。 作為相位差板’可列舉對高分子素材實施單軸或雙轴拉 伸處理而成之雙折射性薄膜、液晶聚合物之配向薄膜、以 薄財持液晶聚合物之配向層之相位差㈣。對㈣❹ 之厚度並無特別限制,一般為204 左右。 作為高分子材料,例如可列舉聚乙稀醇、聚乙烯醇縮丁 路、聚甲基乙_、聚丙烯酸經乙醋、經乙基纖維素、声 丙_素、甲基纖維素、聚碳酸醋、聚芳_、㈣、聚 :本二甲酸乙二醇醋、聚萘二甲酸乙二醇醋、聚醚砜、聚 爾、_、聚烯丙基硬、聚醯胺、聚醯亞胺、聚稀 ^聚乳乙烯、纖維素樹脂、環狀聚烯烴樹脂(降冰片烯 系樹脂)或該等之二亓糸、二_ 糸二70糸各種共聚物、接枝乒 ^摻合物等。”高分子材料可藉由拉料而成為配 物(拉伸薄膜)。 /為液晶聚合物’例如可列舉於聚合物之主鏈或側鏈中 *入有Η予液晶配向性之共輛性直線狀原子團(液晶原基) 2鏈型或侧鏈型各種液晶聚合物等。作為主鏈型液晶聚 、、曰之具虹例’可列舉具有以賦予彎曲性之間隔部而結合 ,曰曰原基之構造之聚合物’例如向列配向性之聚醋系液晶 性聚合物、圓盤狀液晶聚合物或膽固醇型液晶聚合物等。 作為側鏈型液晶聚合物之具體例,可列舉如下化合物等, ::將聚矽氧烷、聚丙烯酸酯、聚甲基丙烯酸酯或聚丙二 酉夂酉曰作為主鏈骨架,作為侧鏈利用由共輛性原子團構成之 121806.doc -30· 200817181 間隔部而具有由賦予向列配向性之對位取代環狀化合物單 元構成之液晶原基部之聚合物等。該等液晶聚合物例如通 過以下方法進行處理,即,於對形成於玻璃板上之聚醯亞 胺或聚乙烯醇等薄膜之表面進行摩擦處理者、斜向蒸鍍有 氧化石夕者等之配向處理面上,鋪展液晶性聚合物之溶液並 進行熱處理。 相位差板例如既可為各種波長板或以補償液晶層之雙折 射所造成之著色或視角等為目的者等具有對應於使用目的 適當相位差者,亦可為層疊2種以上之相位差板而控制相 位差等光學特性者。 相位差板可根據各種用途而選擇使用滿足nx=ny>nz、 nx>ny>nz 、 ny>ny=nz 、 nx>nz>ny 、 nz=nx>ny 、 nz>nx>ny 、 nz>nx=ny之關係者。再者,ny=nz不僅包括ny與nz完全相 同之情況,亦包括ny與nz實質上相同之情況。, 例如,滿足nx>ny>nz之相位差板,較好的是使用滿足正 面相位差滿足40〜100 nm、厚度方向相位差滿足100〜320 nm、Nz係數滿足1.8〜4.5者。例如,滿足nx>ny=nz之相位 差板(正性A板),較好的是使用正面相位差滿足100〜200 nm者。例如滿足nz=nx>ny之相位差板(負性A板),較好的 是使用正面相位差滿足100〜200 nm者。例如,滿足 nx>nz>ny之相位差板,較好的是使用正面相位差滿足 1 5 0〜300 nm、Nz係數滿足0〜0·7者。另外,如上所述,例 如可使用滿足nx=ny>nz、nz>nx>ny或nz>nx=ny之相位差 板0 121806.doc •31 - 200817181 透明保護薄膜可根據所應用之液晶顯示裝置進行適當選 擇。例如為VA(垂直排列)(Vertical Alignment,包括 MVA、PVA)之情形時,期望偏光板之至少一者(單元侧)之 透月保濩薄膜具有相位差。作為具體之相位差,期望於 Re=0〜240 nm、Rth=〇〜5〇〇 nm之範圍。至於三維折射率, ’月王 nx>ny-nz、nx>ny>nz、單軸、 雙軸、Z化、負性c板)之情況。於液晶單元之上下使用偏 光板捋’既可為液晶單元之上下均具有相位差,或者亦可 為上下任一之透明保護薄膜具有相位差。 如為IPS(In-Piane Switing(板内轉換),包括阳)之情
形時’於偏光板之一方之透明保護薄膜具有相位差之J 況、不具有之情況,均可使用。例如,於不具有相位差: 情:時,期望於液晶單元之上下(單元側)均不具有相位差 之情況。力具有相位差之情料,期望於液晶單元之上下 ^具有相位差之情況、上下任—者具有相位差之情況(例 如上側Z化、下側無相位差之情況’或上侧心板、下側正 性c-板之情況)。具有相位差之情形時,期望於¥ -500〜500 nm、Rth = _5〇〇〜5〇〇細之範圍。至於三維 :,斯望船mnz>ny、nz>_ny、nz>nx>ny(單 軸、Z化、正性C板、正性A板)。 再者,上述具有相位差之薄膜,可於不具有相位差之透 明保護薄膜上另外貼合,從而賦予上述功能。 透 貼合上述偏光膜與透明保護薄膜時所使用之接著 著層若光學上透明,則並無特別限制,可使用水系:溶劑 I21806.doc -32- 200817181 系、熱熔系、自由基硬化型之各種形態者,較好的是水系 接著劑或自由基硬化型接著劑。 作為形成接著層之水系接著劑,並無特別限制,例如可 例示乙烯基聚合物系、明膠系、乙烯系乳膠系、聚胺酿 系、異氰酸酯系、聚酯系、環氧系等。包含此種水系心 劑之接著層可作為水溶液之塗佈乾燥層等而形成,於製備 該水溶液時,根據需要,亦可調配交聯劑或其他添加劑、 酉欠專催化劑。作為上述水系接著劑,較好的是使用含有乙 烯基聚合物之接著劑等,作為乙烯基聚合物,較好的是聚 乙烯醇系樹脂。另外,亦可於聚乙烯醇系樹脂中含有硼酸 或删9戊一醛或二聚氰胺、草酸等水溶性交聯劑。特別 是於使用聚乙烯醇系之聚合物薄膜作為偏光膜之情形時, 就接著性方面而言,較好的是使用含有聚乙烯醇系樹脂之 接著A j進而,就提咼耐久性方面而言,更好的是含有具 有乙酿乙酸基之聚乙烯醇樹脂之接著劑。 對上述聚乙烯醇系樹脂並無特別限定,就接著性方面而 較好的疋平均聚合度為1〇〇〜3000左右、平均息化度為 85〜1〇〇莫耳%左右。另外,作為接著劑水溶液之濃度,可 根據目標接著層之厚度而適當確定,故而並無特別限定, 車:好的是G.1〜15重量%,更好的是05〜1()重量%。若該溶液 濃度過高,則黏度過於上升,故而容易產生條紋狀之凹凸 不均,若溶液濃度過低,則塗佈性變差,容易成為不均。 聚乙烯醇系樹脂可列舉使聚乙酸乙烯酯皂化而獲得之聚 乙烯i子,其衍生物;進而可列舉乙酸乙烯酯與具有共聚合 121806.doc -33- 200817181 =早體之共聚物之皂化物’·使聚乙烯醇縮酸化、胺基甲 敲知化、醚化、接枝化、磷酸酯化等獲得之改性聚乙烯 酉予作為上述單體,可列舉順丁烯二酸(酐)、反丁烯二 :丁烯酸、衣康酸、(甲基)丙烯酸等不飽和羧酸及其酯 類;乙稀、丙烯等α-烯烴,(甲基)烯丙基磺酸(鈉)、磺酸 鈉(順丁烯二酸單烷基酯)、烷基順丁烯二酸二磺酸鈉、ν_ 羥甲基丙烯醯胺、丙烯醯胺烷基磺酸鹼鹽、Ν_乙烯基吡咯 烧嗣、Ν-乙稀基^比略烧s同衍生物等。該等聚乙烯醇系樹脂 可單獨使用一種,或併用兩種以上。 各有乙醯乙醯基之聚乙烯醇系樹脂,係利用眾所周知之 方法使聚乙烯醇系樹脂與二乙烯酮發生反應獲得。例如, 可列舉使聚乙烯醇系樹脂分散於乙酸等溶劑中後,向其中 /4、加一乙烯酮之方法;預先使聚乙烯醇系樹脂溶解於二甲 基甲胺或二噁烷等溶劑後,向其中添加二乙烯酮之方法 等。另外,亦可列舉使二乙烯酮氣體或液狀二乙烯g同直接 接觸聚乙稀醇之方法。 3有乙醯乙醯基之聚乙烯醇系樹脂之乙醯乙醯基改性度 右為0·1莫耳%以上,則並無特別限定。當未滿〇1莫耳% 時,接著層之耐水性不充分,故而不適合。乙醯乙醯基改 性度較好的是0.^40莫耳%左右,進而較好的是卜2〇莫耳 %,特別好的是2〜7莫耳%。乙醯乙醯基改性度若超過仂莫 耳/〇則與父如劑之反應點變少,对水性之提高效果較 小。此種乙醯乙醯基改性度可利用核磁共振裝置 (NMR:NuClear Magnetic Resonance)測定。 121806.doc -34 - 200817181 乍為乂聯劑’可並無特別限制地使用通常於接著劑中使 ’例如使用如上所述之聚乙烯醇系樹脂之接著劑之情 二可較好地使用至少具有2個與聚乙稀醇系樹脂具有 反應性之官能團之化合物。例如,可列舉乙二胺、三伸乙 二胺?二胺等具有伸烷基與兩個胺基之烷基二胺類;甲 二:II敲酯、虱化甲苯二異氰酸酯、三羥甲基丙烷甲苯 二、fl S“日加合物、三苯基甲燒三異氰酸醋、亞甲基雙(心 本基甲烷三異氰酸酯)、異佛爾酮二異氰酸酯以及該等之 酮肟敗奴物或苯酚嵌段物等異氰酸酯類;乙二醇二縮水甘 '聚乙-醇-縮水甘油醚、甘油二或三縮水甘油醚、 M-己二醇二縮水甘油醚、三羥甲基丙烷三縮水甘油醚' t縮水甘油基苯胺、二縮水甘油基胺等環氧類;甲駿、乙 .、丙駿、丁駿等單駿類;乙二駿、丙二盤、丁二駿、戊 :酸、順丁稀二駿、鄰苯二甲駿等二駿類;經甲基尿素、 搜甲基三聚氰胺、燒基化經甲基尿素、烧基化輕甲基三聚
味 乙胍井、笨代二聚氰胺與甲駿之縮合物等胺其I ㈣脂1而可列舉納、鉀、鎮、舞、〜甲 ^ 銘、鐵、鎳等二價 生屬或三價金屬之鹽及其氧化m較好的是胺基_ 甲酸樹脂’特別好的是具有f基之經甲基化合物。 ^聯劑之調配量相對於!⑽重量份樹脂,通常為 重量份左右’較好的是使用10〜25重量份者,於強調接著 劑之耐久性之情形時,與從製備接著劑到成為接著層之時 間(使用時^變短相反,調配30重量份以上46重^份以 下更好的疋32重置份以上40重量份以下之交聯劑亦較為 121806.doc -35- 200817181 作為自由基硬化型接著劑,可例示電子射線硬化型、紫 外線硬化型等活化能量線硬化型,熱硬化型等各種接著 J ’#又好的是短時間内可硬化之活化能量線硬化型。特別 好的是電子射線硬化型。
作為硬化性成分,可列舉具有(甲基)丙烯醯基之化合 物具有乙烯基之化合物。該等硬化性成分可使用單官能 或一 g能以上之任意一種。另外,該等硬化性成分可單獨 使用一種或組合使用兩種以上。作為該等硬化性成分,例 士較好的疋具有(甲基)丙烯醯基之化合物,例如可列舉各 種裒氧(甲基)丙烯酸酯、(甲基)丙烯酸胺基甲酸酯、聚酿 (甲基)丙烯酸酯或各種(甲基)丙烯酸酯系單體等。 於上述硬化性成分中,較好的是環氧(甲基)丙烯酸酯、 制好的是具有芳香環及羥基之單官能之(甲基)丙烯酸 酉曰。(甲基)丙烯酸醋表示丙烯酸醋及/或甲基丙烯酸醋。於 本發明中(甲基)丙烯酸酯為該含義。 、 具有芳香環及經基之單官能之(甲基)丙婦酸醋可使用且 有芳香環及經基之各種單官能之(甲基)㈣酸醋1基亦 可=為方香環之取代基而存在’於本發明中較好的是作為 使芳香環與(子基)丙烯酸醋鍵結之有機基團(鍵結於經基、 尤其是伸烷基者)而存在。 馬上述具有芳香環及 舻 p , 一一 τ ((γ暴)丙烯酸 酉日’例如可列舉具有芳香環 之展氧化合物與(甲 基)丙烯酸之間之反應物。作為 f馬具有方香環之單官能之環 I21806.doc -36- 200817181 氧化合物,例如可列舉贫
牛本基鈿水甘油醚、第三丁 A 水甘油醚、苯基聚乙k # 了基本基縮 一 % %水甘油醚等。作為| 及羥基之單官能之(甲x /、有方香裱 基烯酸酯之具體例,例如可列舉 (甲基)丙烯酸2-羥基_3_筅, 』牛 3-第:丁m 本乳基丙醋、(甲基)丙烯酸2-經基- . 二㈣M。 (甲基)丙烯酸㈣基·3_苯基聚乙 ^卜^乍為具有(甲基)丙烯醯基之化合物,可較好地使 • 3鼠早體及/或缓基單體。該等單體於接著性方面較 好0 作為含氮單體,例如可列舉Ν·㈣醯嗎琳、Ν·丙稀醯旅 ^ 丙烯醯吼略咬等具有嗎琳環、 旅定%、口比嘻°定J哀、旅嗪等雜環之含雜環丙稀酸單體。另 外,作為含氮單體,例如可列舉順丁婦二酿亞胺、n-環己 基順丁烯二醯亞胺、N•苯基順丁烯二酸亞胺;(甲基)丙婦 鹼胺、N,N-二甲基(甲基)丙烯醯胺、N,N_二乙基(曱基)丙 馨烯酏胺、N_己基(甲基)丙烯醯胺、N-甲基(甲基)丙烯酞 , 胺、1丁基(曱基)丙烯醯胺、N-丁基(甲基)丙烯醯胺或N_ 經甲基(甲基)丙烯醯胺、N-羥甲基丙烷(甲基)丙烯醯胺、 队異丙基丙烯醯胺、N-羥甲基(甲基)丙烯醯胺、N•羥基乙 基(甲基)丙烯醯胺、N-羥甲基丙烷(曱基)丙烯醯胺等 (N-取代)醯胺系單體;(甲基)丙烯酸胺基乙酯、(甲基)丙烯 ^胺基丙酯、(曱基)丙烯酸N,n-二甲基胺基乙酯、(甲基) 丙烯酸第三丁基胺基乙酯、(甲基)丙烯酸3_(3_pyrinidy][)丙 酉曰專(甲基)丙浠酸烧基胺基烧基酯系單體;N_(甲基)丙烯 121806.doc •37- 200817181 酿氧基亞甲基丁二醯亞胺或叫甲基)丙烯醯基冬氧基六亞 甲基丁二醯亞⑯、N_(甲基)丙婦酿基_8•氧基八亞甲基丁二 酿亞胺等丁二醯亞胺系單體等。含氮單體例如較好的是含 雜環丙烯酸單體’特別好的是N-丙烯醯嗎啉。 作為叛基單體,例如可列舉(甲基)丙烯酸、(甲基)丙歸 酸叛基乙醋、(甲基)丙烯酸緩基戊醋等。其中,較好的是 丙稀酸。
除此以外,作為具有(甲基)丙烯醯基之化合物,亦可列 舉(甲基)丙烯酸甲_、(甲基)丙烯酸乙_、(甲基)丙稀酸正 丁酯、(甲基)丙烯酸2-乙基已酯、(曱基)丙烯酸異辛酯、 (甲基)丙烯酸異壬酯、(甲基)丙烯酸月桂酯等碳數為〗〜^ 之(曱基)丙烯酸烷基酯;(甲基)丙烯酸甲氧基乙酯、(甲基) 丙烯酸乙氧基乙酯等(曱基)丙烯酸烷氧基烷基酯系單體; (甲基)丙烯酸2-羥乙酯、(甲基)丙烯酸2_羥丙酯、(甲基)丙 烯酸4-羥丁酯、(甲墓)丙烯酸羥己酯、(曱基)丙烯酸8-羥 辛酯、(曱基)丙烯酸10-經癸酯、(甲基)丙烯酸12_經月桂酯 或(4-羥甲基環已基)_甲基丙烯酸酯等含羥基單體;順丁烯 二酸酐、衣康酸酐等含酸酐基單體;丙烯酸之已内酯加成 物;苯乙烯磺酸或烯丙基磺酸、2-(甲基)丙烯醯胺曱基 丙烧磺酸、(甲基)丙烯醯胺丙烷磺酸、磺基丙基(甲基)丙 烯自曰、(甲基)丙烯醯氧基萘磧酸等含磧酸基單體;罗呈 乙基丙烯醯基磷酸酯等含磷酸基單體等。 作為上述硬化性成分,可較好地使用具有芳香環及經基 之單官能之(曱基)丙烯酸酯、含氮單體、羧基單體。就可 121806.doc -38 - 200817181 以獲得相對於偏光膜及透明保護薄膜接著性良好 之偏光板方面而言,較好的是含有5〇重量%以上之: 分作為硬化性成分。進而,就塗佈性、加工性等方面 2較好。上述硬化性成分之比例較好的是含有 5 作為上述硬化性成分, 分。作為_ J便用一吕靶以上之硬化性成 之(甲^Γ 之硬化性成分,較好的是二官能以上 甲基)丙細酸醋、特別好的是二官能以上 丙烯酸酯。-令处丨、,, T虱(甲基) _ —此以上之環氧(甲基)丙烯酸酯可藉由單官 月b裱氧化合物與(甲基)丙烯酸 之環氧化入札久應而獲侍。多官能 化合種環氧化合物。作為多官能之環氧 脂肪族環氧樹脂。 〇切氧樹脂、 ::::::環氧樹脂’例如可列舉雙紛A之二縮水甘油 雙紛型譬氧^缩水甘油喊、雙齡8之二縮水甘油喊之類之 環氧樹月旨苯酶㈣清漆環氧樹脂、甲㈣酸清漆 清漆型環氧=本甲駿苯基㈣清漆環氧樹脂之類之紛酸 二苯甲剩=:,吨基苯基甲烧之縮水甘㈣、四經基 能型環氧樹::甘油驗、環氧化聚乙烯基苯紛之類之多官 化為::::環氧樹脂,可列舉上述芳香族環氧樹腊之氫 系、三-二以、環6基甲基㈣、環已基甲㈣、螺 又六燒糸等環氧樹脂。 121806.doc -39- 200817181 作為脂肪族環I搞8t A 9,可列舉脂肪族多元醇或其環氧烷 M_之_ ::。作為該等之例,可列舉藉由使 _、甘4 _ 甘油己二醇之二縮水甘油 醚、取乙,7縮水甘油醚、三羥甲基丙烷之三縮水甘油 _ 一 a水甘油醚、丙二醇之二縮水甘油醚、 上丙二醇、甘油之類之脂肪族多元醇加成1或2種以 取妒氧乙烧或環氧丙烧)而獲得之聚驗多元醇之 來鈿水甘油醚等。 上述環氧樹脂之環氧當量通常於30〜3000 g/當量之範 圍,較好的是於50〜15〇〇g/當量之範圍。
上述二官你d L b 2 J辰氧(甲基)丙烯酸酉旨較好的是脂肪族 哀,樹脂之環氧(甲基)丙婦酸_。特別好的是二官能之脂 肪私裱氧樹脂之環氧(甲基)丙烯酸酯。 於:述硬化性成分中,具有(曱基)丙烯 &&基之化合物、 ㈣是具有芳香環及經基之單官能之(甲基)丙烯酸_、含 亂(曱基)丙烯酸醋、含羧基(甲基)丙烯酸醋適合作為電子 射線坚接著劑’藉由使用該接著劑,可獲得相對於偏光膜 2明保護薄膜具有良好之接著性之偏光板。例如使用低 F刀率之偏光膜之情形時,以及使用透濕度低之材料作為 透明保€薄膜之情形時,本發明之接著劑對該等顯示出良 子之接著丨生,其結果可獲得寸法穩定性良好之偏光板。 硬化型接著劑含有硬化性成分,除了上述成分以外,根 據硬化之類型而添加自由基起始劑。卩電子射線硬化型使 用上述接著劑之情形時,並非必須於上述接著劑中含義自 121806.doc -40 - 200817181 由基起始劑,以紫外線硬化型、熱硬化型使用之情形時使 用自由基起始劑。自由基起始劑之使用量,每剛重量份 硬化性成分,通常為(M〜10重量份左右,較好的是〇. 量份。 另外,上述接著劑中亦可含有金屬化合物填充劑。利用 金屬化合物填充劑,可控制接著層之流動性,可獲得使膜 厚穩定化、具有良好之外觀、面内均句且無接著性不均之 偏光板。 可使用各種金屬化合物填充劑。作為金屬化合物,例如 可列舉氧化銘、氧化石夕、氧化錯、氧化鐵、石夕酸銘、碳酸 •巧;^酉文鎂等金屬氧化物;碳酸鋅、碳酸鎖、碗酸轉等金 屬鹽,氣鎂石、滑石、黏土、高嶺土等石廣物。另外,該等 金屬化合物填充劑可使用已進行表面改性之金屬化合物填 充劑。 二金屬化合物填充劑之平均粒徑通常為卜…⑼左右, 争乂好的疋1〜500 nm,進而較好的是1〇〜2〇〇議,進而更好 、疋 θϋ nm。金屬化合物填充劑之平均粒徑若於上述 乾圍内’則可於接著層中大致均勻地分散金屬化合物,可 確保接著性且獲得外觀良好之、面内均勾之接著性。 至屬化〇物填充劑之調配量,相對於〗〇〇重量份接著劑 成分,較好的是以100重量份以下之比例調配。另外,藉 由使金屬化合物填充劑之調g己比例於上述範圍内,能夠確 保偏光膜與透明保護薄膜之接著性,且同時可獲得外觀良 内句勻之接著性。金屬化合物填充劑之調配比例較 121806.doc -41 - 200817181 重量份’進而較好的是2〜5〇重量份,進而更 广。重量份。金屬化合物填充劑之調 於100重量份接著劑成分,若 相對 之接著劑成分之比例變H ±里伤’則接著劑中 再者,對金屬化合物填充劑: = 並非較好。 Μ之调配比例並無特別限制,. 性確保接著性且同時獲得外觀良好之、㈣均勻之接著 而使其為上述範圍之下限值。 另外’接著層或黏著;夕泌# 溶劑或低溶劑狀態下進二二=使用能•無 ❹先别眾所周知之乾式層堡用接著劑及貼合方 :二可:除了本發明以外,亦可使用該方法。藉此,具 —步減少條紋狀凹凸不均等之效果。 作為上述乾式層壓用接著劑,可列舉二液硬化型接著 :化;1=丨型接著劑、一液無溶劑型接著劑。作為二液 i接者劑,可使用丙稀酸系樹脂,作為二液溶 ::,可使用聚I系、芳香族聚㈣、脂肪族聚醋系、聚 :…旨系、聚醚/聚胺醋系樹脂,作為一液 者劑(濕硬化型類型),可使用聚醚/聚胺醋系等樹脂。 ^接著層或黏著劑,必要時亦可含有適當之添加劑。 =為添力:劑之例’可列舉以幾基化合物等為代表之利用電 、、、提q硬化速度或靈敏度之增感齊】、石夕燒偶合劑、鈦 二 偶合劑’以環氧乙烧為代表之助黏劑,提高與透 、':專臈之潤濕性之添加劑,以丙烯醯氧基化合物或烴 '、天然、合成樹脂)等為代表、提高機械強度或加工性等 121806.doc -42- 200817181 紫外線吸收劑’抗老化劑,, 子捕木蜊,抗氧化劑,增黏劑,填 ::填充劑以外”可塑劑,均化劑,發泡抑 '’耐熱穩定劑,耐水解穩定齊J等穩定劑#。 月“
藉士於上述偏光膜之兩面經由接著層或黏著層 保4溥膜’可獲得偏光板,亦可於接著層或黏著声 保護薄膜或偏光膜之間設置底塗層或易接著處理^等。日 利用上述製造方法而形成之接著層由水系接著劑 之:形時’上述接著層之厚度較好的是3〇〜3〇〇⑽。上、水
接著層之厚度進而較好的是6〇〜25〇 。 一 ;L " 乃面,接莫 層由硬化型接著劑形成之情形時,上述接著層之厚❹ 的是〇·1〜200 μιη。更好的是〇·5〜二乂 μ 進而較好的是 〜1 ϋ μπι 〇 上述偏光板進而可製成至少層疊有】層各種光學功能層 之光學薄膜而使用。作為該光學功能層,例如可列舉硬= 處理層或抗反射處理層、防黏處理層、或者擴散層或防眩 處理層等表面處理層、或者以視角補償或光學補償為目的 之配向液晶層。進而亦可列舉層疊有〗或2層以上偏光轉換 7L件、反射板或半透過板、相位差板(包括1/2或1/4等波長 板(λ板))、視角補償薄膜、亮度提昇薄膜等於圖像顯示裝 置等之形成中所使用之光學薄膜的光學功能層。特別好的 是使用於上述偏光板上層疊反射板或半透過反射板而成之 反射型偏光板或半透過型偏光板;於偏光板上層疊相位 差板而成之橢圓偏光板或圓偏光板;於偏光.板上層疊視角 I21806.doc 200817181 補償層或視角補償薄膜而成之寬視角偏光板;或者於偏光 板上層疊亮度提昇薄膜而成之偏光板。 層璺上述光學功能層之情形時,通常上述表面處理層或 配向液晶層直接層疊於偏光板等薄膜上即可,由各種薄膜 構f之光學功能層較好的是使用經由上述接著層或黏著層 “且之方法。作為此時之接著層或黏著層,特別好的是使 用包含黏著劑之黏著層。 /作為包含黏著劑之黏著層’例如可利用丙烯酸系、矽酮 :酿系、聚胺醋系、聚醚系、橡膠系等基於先前之適 田^者則而形成0作為該黏著劑,自防止因吸濕所造成之 i包現象或剝離現象、防止因熱膨脹差等所引起之光學特 = 或液晶単元翹曲、並且品質高且耐久性優良之液晶 、置之形成性等觀點而言,較好的是吸濕率低且耐熱 良:黏著層,進而’就防止偏光板等之光學特性變化 方,而言,較好的是於硬化或乾燥時不需要高溫之製程之 黏者層’不需要長時間之硬化處理或乾燥處理之黏著層。 就此種觀點而言, 傲 烯酸系黏著劑。另外= 上較好的是使用丙 ^ , Β 另外,亦可於上述黏著劑中添加微粒子, ι成顯示光擴散性之黏著層等。 =著層或黏著層根據需要設置於必要之面上即可,例 :二及如本發明之包含偏光臈與保護薄膜之偏光板,則 根據需要於偏光板之_ 只』 厂兩面、即若為保護薄膜則於與 偏先μ貼合之相反側之面 用於如此層疊光學功能声=或黏者層即可。作為 匕層之清形時的包含黏著劑之接著層 I2I806.doc -44- 200817181 =層=燥後之厚度,並無特別限定,通常一 μπι左右,杈好的是5〜2〇〇 μιη,更好 使接著層或黏著層之厚度於該範圍内,:緩由 學功能層之尺寸變動所伴隨之應力。 於包含黏著劑之黏著層露^表面之情形時,較好的是 於供於使用前以防止該黏著層受到 隔離件進行臨時㈣覆苗。作紅触為㈣,而利用 η占貼後盍。作為隔離件,較
護薄膜等之薄膜上,根據需要設置利用㈣系 ^或硫化㈣適宜之剝離劑所實施之剝 離塗層者。 實施硬塗處理之目的在於防止偏光板表面之損傷等,例 如可藉由如下方式形成,即,於保護薄膜之表面上附加由 丙烯酸系、㈣系等適當之紫外線硬化型樹脂所形成之硬 度、滑移特性等良好之硬化被膜。實施抗反射處理之目的 在於防止外光偏光板表面之反射,可藉由形成基於先前之 抗反射膜等來實現。再者,實施防黏處理之目的在於防止 與鄰接層密接。 實施防眩處理之目的在於防止外光於偏光板表面反射而 干擾偏光板透射光之辨識等,例如,可藉由利用噴砂方式 或壓花加工方式所進行之粗面化方式或調配透明微粒子之 方式專適Ϊ之方式’對保護薄膜表面賦予微細凹凸結構, 藉此形成。作為用以形成上述表面微細凹凸結構而含有之 微粒,例如,可使用平均粒徑為〇·5〜5〇 之包含二氧化 矽、氧化鋁、氧化鈦、氧化鍅、氧化錫、氧化銦、氧化 121806.doc -45 » 200817181 鑛、氧化錄等之有時具有導電性之無機系微粒子、包含交 聯或者末交聯之聚合物等之有機系微粒子等透明微粒子二 當形成表面微細凹凸結構時,微粒子之使用量相對於1〇〇 重篁份形成表面微細凹凸結構之透明樹脂,通常為2〜7〇重 . 4份左右。防眩層亦可兼作用以使偏光板透射光擴散而擴 大視角等之擴散層(視角擴大功能等)。 ' 再者,上述抗反射層、防黏層、擴散層或防眩層等光學 • 1 力能層除了可直接設置於偏光板上以外,亦可作為其他: 光學薄膜與偏光板分開設置。 反射型偏光板係於偏光板上設置反射層者,其用以形成 反射來自辨識側(顯示側)之入射光而進行顯示之類型的液 晶顯示裝置等,並且可省略背光燈等光源,具有易於使液 日日顯不瓜置薄型化等優點。形成反射型偏光板時,可利用 根據需要經由保護薄膜等於偏光板之一面上附設由金屬等 構成之反射層的方式等適當之方式進行。 • 再者,半透過型偏光板可藉由製成於上述中以反射層反 射光之同時使光透過的半透半反鏡等半透過型反射層而獲 付。半透過型偏光板通常設置於液晶單元之内側,可形成 . 如下類型之液晶顯示裝置等,即,於比較明亮之環境中使 用液晶顯示裝置等之情形時,反射來自辨識側(顯示侧)之 入射光而顯示圖像’於比較暗之環境中,使用内置於半透 過型偏光板之背面之背光燈等内置光源來顯示圖像。 。對偏光板上進一步層疊相位差板而構成之橢圓偏光板或 圓偏光板進行說明。於將直線偏光改變為橢圓偏光或圓偏 121806.doc -46· 200817181 光,或將橢圓偏光或圓偏光改變為直線偏光,或者改變直 線偏光之偏振方向之情形時,可使用相位差板等。特別 是,作為將直線偏光改變為圓偏光或將圓偏光改變為直線 偏光之相位差板,可使用所謂之1/4波長板(亦稱為人/4 板)。1/2波長板(亦稱為λ/2板)通常用於改變直線偏光之偏 振方向之情形。 橢圓偏光板可有效地用於以下情形等,即補償(防止)超
扭曲向列(STN)型液晶顯示裝置因液晶層之雙折射而產生 之著色(藍或黃),從而進行無上述著色之白黑顯示。另 外,控制三維折射率之偏光板亦可補償(防止)自斜向觀察 '曰^示裝置之晝面時產生之|色’故而較好。圓偏光板 〇 用於例如對以彩色顯示圖像之反射型液晶顯示裝 置之圖像之色調進行調整之情形等,而且亦具有防止反射 之功能。 作為相位差板’可列舉對聚合物薄膜進行單轴或雙轴拉 伸處心形成之雙折射性薄膜,使液晶單體發生配向之後 :^又聯I 口而成之配向薄膜,液晶聚合物之配向薄 膜支持液晶聚合物之配向層者等眾所周知之薄 相位差板既可為例如久 ώ ^各種波長板或以補償由液晶層之雙 折射所造成之著色^^顏 „ ^ ^ 巴次視角專為目的者等具有對應於使用目 的之適當相位差者,亦 為層疊2種以上之相位差板而控 制相位差等光學特性者等。 視角補償薄膜係於自 不ΐ直於晝面而稍微傾斜之方向觀 121806.doc »47- 200817181 察液晶顯示裝置之書面昧介^ 直之旦面日守亦使圖像看起來比較鮮明之、用 於擴大視角之薄膜。可#帛1 J便用具有如下目的之適當者,即, 防止基於由液晶單顧造成之相位差而形成的辨識角之變 =所帶來之著色等或擴大辨識度良好之視角等。另外,就 貫現辨識度良好之寬禎自太而榮 見視角方面寺^,可較好地使用以三 乙i截、准素薄膜支持包含液晶聚合物之配向層、特別是圓 盤狀液晶聚合物之傾斜配向層的光學各向異性層之光學補
償相位差板。 作為偏光轉換元件,例如可列舉各向異性反射型偏光元 件或各向異性散射型偏光元件等。例如可列舉日東電工製 造之PCFU或3财31製造之麵Ff、料。另外,作為 各向異性反射型偏光元件,亦可較好地使用反射型拇式偏 光子。作為該例,可列製造之Micr〇Wires等。另 一方面,作為各向異性散射型偏光元件,例如可列舉 公司製造之DRPF等。 貼合有偏光板與亮度提昇薄膜之偏光板通常設置於液晶 單元之内側而加以使用。亮度提昇薄膜係顯示如下特性之 薄膜,即,當因液晶顯示裝置等之背光燈或來自内側之反 射等而自然光入射時,會反射特定偏光軸之直線偏光或特 疋方向之圓偏光,而使其他光透過,因此將亮度提昇薄膜 與偏光板層疊而成之偏光板可使來自背光燈等光源之光入 射,而獲得特定偏光狀態之透過光,並且上述特定偏光狀 態以外之光無法透過而被反射。進而經由設置於其後侧之 反射層等使於該亮度提昇薄膜面上反射之光反轉,再次入 121806.doc -48- 200817181 ,至亮度提昇薄膜上’使其—部分或全部作為特定偏光狀 態之光透過,從而增加透過亮度提昇薄膜之光,同時提供 偏光薄膜難以吸收之偏光’從而增大可用於液晶顯示圖像 之顯示等之光量,藉此可提高亮度。
另外,本發明之偏光板如同上述偏光分離型偏光板,可 由層叠有偏光板與2或3層以上之光學功能層者構成。因 此’亦可為組合上述反射型偏光板或半透過型偏光板盘相 位差板而成之反射型橢圓偏光板或半透過型橢圓偏光板 於偏光板上層疊有上述光學功能層之光學薄膜,亦可利 用於液晶顯示裝置等之製造過程中依次獨立層疊之方式而 形成,但預先經層疊而製成光學薄膜者具有品質之稃定性 或組裝作業等優良、可改善液晶顯示裝置等之製_的 優點。於層疊中可使用接著層等適當之接著手段。於接著 上述偏光板與其他光學功能層時’彼等之光學軸可根據目 標之相位差特性等而設為適當之配置角度。 再者,上述偏*板、光學功能層或接著劑、霉占著層等各 層亦可為例如藉由如下適當方式而使之具有紫外線財能 力者i該方式為利用水楊酸醋系化合物或二^_系化& 物、本幷三唾系化合物或氰基丙烯酸_系化合物、錄錯鹽
系化合物等紫外線吸收劑進行處理之方式等。 I 本發明之偏光板可較好地用於液晶顯示裝置(lcd)、電 致發光顯示裝置(ELD)等圖像顯示裝置之形成。 偏光板可較好地用於液晶顯示裝置之形成等,例如Μ 121806.doc -49- 200817181 在於液晶單元之一側或兩側配置偏光板而成之反射型或半 透過型或者透過·反射兩用型等之液晶顯示裝置。液晶單 元基板可為塑膠基板、玻璃基板之任一種。形成液晶顯示 衣置之液晶單元可為任意類型,例如可使用以薄膜晶體管 1為代表之主動矩陣驅動型液晶單元、以扭曲向列型或超 扭曲向列型為代表之單純矩陣驅動型之液晶單元等適當類 ‘型之液晶單元。 φ 另外,當於液晶單元之兩側設置偏光板或光學薄膜時, 彼等既可相同亦可不同。進而,於形成液晶顯示裝置時, 可於適田位置上配置1或2層以上之例如稜鏡陣列板、透鏡 陣列板、光擴散板、背光燈等適當之部件。 [實施例] 以下利用實施例及比較例對本發明進一步具體說明,但 本發明不受該等實施例及比較例限定。 (偏光膜之水分率測定方法) • 自所獲得之偏光膜切下180 mmx500 mm之樣品,測定其 初始重量(w(g))。將該樣品於120<t之乾燥機内放置2小 , s夺,然後測定乾燥後重量(D(g))。根據下述式,自該等測 疋值求得水分率。 水分率 OhUW-DVWplOO (偏光膜之製作) 使用厚度為75叫1之聚乙烯醇薄膜((株)KUraray製:VF_ Ρ^7500’寬1〇〇〇麵),將其於3(rc之純水中浸潰秒同 時拉伸至拉伸倍率為2·5 ’於邮之埃水溶液(重量比:純 12I806.doc -50- 200817181 水/碘(I)/碘化鉀(Kpyoo/oo^)中染色45秒,於4重量%之 硼I水〉谷液中拉伸至拉伸倍率為5.8倍,於純水中浸潰1〇 移後’於保持薄膜之張力之狀態下於4(TC乾燥3分鐘,獲 得偏光膜。該偏光膜之厚度為25 μιη,水分率為30重量 %。 (附有接著層之透明保護薄膜之製作) 於376〇重$份純水中溶解100重量份PVA樹脂(日本合成
化予工業(株)製:Gosen〇1)及35重量份交聯劑(大曰本油墨 =子工業(株)製:Waters〇1),製備接著劑。以槽模將該接 者劑塗佈於厚度為8〇 μπι之三乙醯纖維素(tac)薄膜(富士 膠片么司製· UZ-80T,水分率為14重量%)之一面側後, 於85 C乾燥1分鐘,獲得具有厚度為〇·1 μιη之接著層之附 有接著層之TAC薄膜。 實施例1 (偏光板之製作) 利用圖1所示之方法,製作偏光板。樹脂薄膜Α使用上述 偏光膜,第一透明薄,B1及第二透日月薄膜B2使用上述附 :接著層之TAC薄膜。以TAC薄膜侧成為第一金屬輥bi、 第至屬I b2側之方式輸送附有接著層之薄膜。使用 直徑200 mm之鐵輥作為第一金屬_、第二金屬㈣。使 用於鐵芯之周圍具有橡膠層(硬度9〇度,厚度3叫之杜構 之直請麵之輥作為第一彈性輥以、第二彈性輥仏 向第一彈性輥與第—金屬輥之_,輸送偏光膜與附有 接著層之⑽薄膜,對該等進行壓接,使TAC薄膜貼合於 121806.doc -51 · 200817181 偏光膜之一面,獲得層 一 日 --------7 u于,第 弹性輥與第一金屬輥之層疊壓力為3·5 Mpa,第一彈性 輕因與第一金屬輕之擠壓而發生凹變形。確認如圖2a所示 之凹部端點⑴)。以第一彈性親之變形凹部端點處之切線 (川與偏光膜之輸送線所成之角度(eia)成m ι。之方式 輸送偏光膜。另-方面’以凹部端點㈣與第一透明薄: 之輸达線所成之角度(eib)成為+94。之方式輸送第—透明薄 =再者’上述角度係以切線(yl)為基準,右旋為「小 左旋為「-」之角度。 =,不捲取層疊膜,而向第二彈性輥與第二金屬輕之 送層疊膜與附有接著層之TAC薄膜,對 於偏光膜之兩面貼合有TAC薄膜之偏光板(相當於 層3_L2)。此時,第二彈性1 昆與第二金屬輥之 曰且力為3.5 MPa,第二彈性輥因與第二金屬輥 Γ=ΓΓ:。確認如圖2B所示之凹部卿二 線所成之角 =文形凹部端點處之切線(y2)與層疊膜之輸送 面 =(e2a)成為+11.1。之方式輸送層疊膜。另一方 以凹部端點(X2)與第:透明薄 (叫成為膏之方式輸送第二透明薄膜輸^所成之角度 係以切線⑽為基準,右旋為「+」,左旋者’上述角度 斧上述中’各薄膜之輪送速度為3G W分鐘之。角^, 上述中所獲得之偏光板,貼合後於:於 實施例2〜18 知2分知。 於實施例1中,將各薄膜 、别运線相對於切線(yl)所成 121806.doc -52· 200817181 之角度(Θ la) (01b)、各4膜之輪送線相對於切線(丫2)所成 之角度(G2a)、(02b)或層疊壓力如μ所示加以改變,除此 以外,以與實施例1同樣之方式獲得偏光板。 實施例19 • 於貝訑例16中’將第一及第二彈性輥之橡膠層之硬度改 义為65度,除此以外,以與實施例〗6同樣之方式獲得偏光 . 板。 $ 實施例20 於貫施例16中,將第一及第二彈性輥之橡膠層之硬度改 變為75度,除此以外,以與實施例16同樣之方式獲得偏光 板。 比較例1〜9 於貝知例1中’如表1所示,替代圖1之方法,採用圖3〜6 中揭示之方法,改變各輥與各薄膜之間之關係,將各薄膜 之輸送線相對於切線(yi)所成之角度(ela)、(eib)、各薄膜 馨 之輸送線相對於切線(y2)所成之角度(02a)、(02b)或層疊壓 力如表1所示加以改變,除此以外,以與實施例1同樣之方 式獲得偏光板。 對貫施例及比較例中製作之偏光板進行下述評價。結果 示於表1。 (氣泡之確認) 自所獲得之偏光板切下500 mmx300 mm之樣品,確認偏 光膜與TAC薄膜之間之氣泡數目。 121806.doc -53 · 200817181 [表1]
表中* 1表不氣泡被帶入、輸送到偏光膜與第一金屬 輥之間,形成帶有氣泡之凹凸痕跡之偏光板,*2表示無 法製備正確之線壓,而形成帶有Μ之偏光板。 由上述表1之結果可知,益 ^ 猎由本發明之實施例,可抑制 树月日薄獏(偏光膜)與透 — / 、(透月保護薄膜)之間所產生 121806.doc -54- 200817181 之氣泡,製造多層層疊膜。另外, 1C 卜由貫施例1〜7盥實施例 8〜15之比較可知,藉由控制各薄腠 ,、““1 ( 、之輪运線相對於切線 (y”所成之角度㈣、_)、各薄 Γν2)所成夕痒/ao、 , 線相對於切線 ⑽所成之角度㈣、_),可以進 【圖式簡單說明】 卩制耽泡。 圖1為表示本發明之多層層疊膜之製造方法之示意圖。 入=為表示於本發明之多層層臺媒之製造方法中薄膜進 入卷b間之角度的關係之示意圖。 圖2B為表示於本發明之多層犀 χ „ 夕日層宜膜之製造方法中薄膜進 入秦b間之角度的關係之示意圖。 二:表不比較例之多層層疊膜之製造方法之示意圖。 =表示比較例之多層層疊犋之製造方法之示意圖。
圆為表示比較例之多層声A ^ 夕層層宜暝之製造方法之示意圖。 圖6為表示比較例之多層層疊 r± ^ "續且嫉之製造方法之示意圖。 L主要元件符號說明】
A 樹脂薄膜 B1 B2 al a2 bl b2 Ml M2 第一透明薄膜 第二透明薄膜 第一彈性輥. 第二彈性輥 第一金屬輥 第二金屬輥 角度改變機構 121806.doc •55-

Claims (1)

  1. 200817181 申請專利範圍: 1. 一種多層層疊膜之製造 乃/5: ’其係於水分率泛 量%之樹脂薄膜之兩 半為10〜60重 分率為〇.5〜5重量%之證 *者廣次黏者層而貼合水 製造方法之特徵在於, #透明屬膑,該 以第—透明薄膜位於第一 膜與第-透明薄膜通J :屬I側之方式,使樹脂薄 對輕間,藉《接㈣X:r屬輥與第—彈性親此等一 、 安向I成層疊膜之後, 並::取該層疊膜,以第二透明 側之方式,使該層疊膜盥 弟一孟屬輥 ^ , 、/、苐一透明薄膜通過第二金屬铲 膜。 對氬間,错此壓接而形成多層層疊 2·如請求項1之多層 夕增層之製造方法,苴 及第二金屬輥之至少包一永& 、、八中弟一金屬輥 .4 &卡 者為鐵輥或不銹鋼輥。 3.如明求項1之多層晶 夕層層宜膜之製造方法,直 及第二彈性鲈b ,、中第彈性輥 輻均為於金屬製造之芯 脂層之彈性輥。 1土饰有橡I層或樹 4 ·如請求項3之容@思田 、之夕層層豐膜之製造方法,並 及第二彈性崖曰夕祕柳 /、宁弟一弹性輥 下。. 橡膠層或樹脂層之硬度為70以上1〇〇以 5. ^求項1之多層層疊膜之製造方法,J:中第 之變形凹部端點声夕+ 6 /、中弟—弹性輥 ^ 2處之切線與樹脂 度(Θ 1 a)、和 守騰之铷达線所成之角 弟彈性輥之變形凹部遮K ^ ώ 卩^點處之切線與第一透明薄膜 121806.doc 200817181 之輪送線所成之角度(eib), 方向㈣輕之變形凹部端點處之切線係為相反 其中,第-彈性輥之變形凹部端點係指:由第 輥接觸擠壓第-彈性親而產生之第孟屬 處的、第一遛η ± t 奏b之¥形凹部 士弟㈣幸昆與第一金屬幸昆之最開始接觸㉝, 树脂薄膜之輸送線係指樹脂薄臈與" 始接觸點處之切線, 輻之最開 —透月4膜之輸送線係指第—透 輥之最開始接觸點處之切線。 物與弟-金屬 6·如印求項1之多層層疊膜之製造方法,並 構:於將樹脂薄膜向第一金屬輥與性;有如下機 間輸送之前,改變第一彈性輥…咐该-對輥 ”树心4膜之輸送線所成之角度(0ia)h 刀線 7·如請求項】之多層層疊膜之製造方法, 之變形凹部端點處之切線與層:弟—彈性輕 ⑽a)、和 且膜之輪达線所成之角度 弟一彈性輥之變形凹部端點虛夕j a 之輸送線所成之角度_)處之切線與第二透明薄膜 相對於第二彈性輥之變形凹 方向, 處之切線係為相反 其中,第—彈性輥之變形凹部端點係扑— 輥接觸擠壓第二彈性輥而產生 。。日.由弟二金屬 處的、第二彈性輥與第二金屬::性輕之變形凹部 蜀钿之最開始接觸點, 121806.doc 200817181 層疊膜之輸送線係指層 觸點處之切線, 且、/、第二彈性輥之最開始接 第二透明薄膜之輪送線 輥之最開始接觸點處之切線。弟-透明相與第二金屬 8·如請求項】之多層層 «續$膜之製造方法, 構··於將層疊膜向繁一八/、具有如下機 —金屬輥與第二彈性輥此等-對輥 間輪运之W ’改變第二彈性輥之變形凹部端點處之切線 9· 與層豐膜之輸送線所成之角度(e2a)者。 月東員1 8中任一項之多層層疊膜之製造方法,其中 第一金屬輕與第一彈性輥間之層疊壓力及第二金屬輥與 第二彈性輥間之層疊壓力之至少任一者為2 MPa以上5 MPa以下。
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TWI594872B (zh) * 2012-10-26 2017-08-11 Nitto Denko Corp Polarizing plate manufacturing method
TWI740820B (zh) * 2015-03-03 2021-10-01 日商住友化學股份有限公司 附有保護薄膜之偏光薄膜的製造方法

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US20100206478A1 (en) 2010-08-19
KR20080006501A (ko) 2008-01-16
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KR101293001B1 (ko) 2013-08-02
US7767047B2 (en) 2010-08-03

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