TW202108269A - Polarizing plate - Google Patents

Polarizing plate Download PDF

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Publication number
TW202108269A
TW202108269A TW109124276A TW109124276A TW202108269A TW 202108269 A TW202108269 A TW 202108269A TW 109124276 A TW109124276 A TW 109124276A TW 109124276 A TW109124276 A TW 109124276A TW 202108269 A TW202108269 A TW 202108269A
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Taiwan
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polarizing plate
polarizer
optical films
film
pair
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TW109124276A
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Chinese (zh)
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矢野央人
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日商住友化學股份有限公司
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • G02B5/3025Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • 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
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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
    • 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
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/325Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
    • 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
    • B32B3/00Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • 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
    • B32B7/00Layered 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
    • B32B7/02Physical, chemical or physicochemical properties
    • B32B7/023Optical properties
    • 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
    • B32B7/00Layered 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
    • B32B7/03Layered 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 with respect to the orientation of features
    • B32B7/035Layered 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 with respect to the orientation of features using arrangements of stretched films, e.g. of mono-axially stretched films arranged alternately
    • 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
    • B32B7/00Layered 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
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • 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
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/42Polarizing, birefringent, filtering

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

This invention provides a polarizing plate capable of suppressing cracks in recesses or through holes even having a protective film made of cycloolefin resin.
A polarizing plate 1 according to this invention is formed by sandwiching a film-shaped polarizer 7 with a pair of optical films 5, 9, and at least one optical film is a protective film made of cycloolefin resin. The polarizing plate 1 is provided with a recess 2 on an outer periphery in a plan view, and in the side view, an end portion 7e of the polarizer 7 is located 15 μm to 56 μm inside the end portion of any of the pair of optical films 5 and 9 in the recess 2, and the end portion 7e of the polarizer 7 is exposed so as to come into contact with the outside air.

Description

偏光板 Polarizing plate

本發明係關於一種偏光板,亦關於一種偏光板之製造方法。 The present invention relates to a polarizing plate, and also to a manufacturing method of the polarizing plate.

偏光板係使用於液晶電視、有機EL電視、智慧型手機、智慧型手錶、或汽車或機車之里程表面板等圖像顯示裝置。偏光板係具備膜狀之偏光片、及重疊於偏光片之光學膜(例如保護膜)。從圖像顯示裝置之設計上的理由,有時在偏光板之外周形成凹部。 Polarizers are used in image display devices such as LCD TVs, organic EL TVs, smart phones, smart watches, or mileage panels of automobiles or locomotives. The polarizing plate is provided with a film-shaped polarizer and an optical film (such as a protective film) superimposed on the polarizer. Due to the design of the image display device, a concave portion may be formed on the outer periphery of the polarizing plate.

例如,在下述專利文獻1中,係記載將凹部(缺口部)形成於偏光板之外周作為液晶之注入口。 For example, in Patent Document 1 below, it is described that a concave portion (notch portion) is formed on the outer periphery of a polarizing plate as an injection port for liquid crystal.

[先前技術文獻] [Prior Technical Literature]

[專利文獻] [Patent Literature]

[專利文獻1]日本特開2000-155325號公報 [Patent Document 1] JP 2000-155325 A

偏光板係伴隨濕度或溫度之變化而膨脹或收縮。伴隨偏光板之膨脹或收縮的應力容易集中於凹部,在凹部中有時會在偏光片產生破裂(龜裂)。 The polarizing plate expands or contracts with changes in humidity or temperature. The stress accompanying the expansion or contraction of the polarizing plate tends to concentrate on the concave portion, and cracks (cracks) may occur in the polarizer in the concave portion.

又,使用環烯烴系樹脂作為保護膜時,若在該偏光板之上隔著接著劑而積層無機玻璃板,有時會受到在接著劑中所含有之含有比較長鏈的烷基之化合物的影響而在保護膜產生破裂。 In addition, when a cycloolefin resin is used as a protective film, if an inorganic glass plate is laminated on the polarizing plate via an adhesive, it may be affected by the compound containing a relatively long-chain alkyl group contained in the adhesive. Affected and cracked in the protective film.

該現象係不僅在形成凹部的情形可看到,在形成有貫通孔的情形亦可看到。 This phenomenon can be seen not only when the recess is formed, but also when the through hole is formed.

本發明係有鑑於上述事情而成者,目的在於提供一種偏光板及該偏光板之製造方法,該偏光板係即使為具備由環烯烴系樹脂所構成的保護膜,亦可抑制凹部或貫通孔中之破裂。 The present invention has been made in view of the foregoing, and its object is to provide a polarizing plate and a method for manufacturing the polarizing plate, which can suppress recesses or through holes even if the polarizing plate is provided with a protective film made of cycloolefin resin In the rupture.

本發明係提供一種偏光板,其係具備膜狀之偏光片、及包含樹脂之至少一對的光學膜,其中,偏光片係位於一對之光學膜之間,且與一對之光學膜重疊,一對之光學膜之中,至少一方之光學膜為保護偏光片之保護膜,保護膜為由環烯烴系樹脂所構成,在俯視中,在外周設有凹部,或在面內設有貫通孔,在側視中,凹部內、或貫通孔內係偏光片之端部係比一對之光學膜之任一者的端部更靠內側15μm至56μm,且偏光片之端部以接觸外部空氣之方式露出。 The present invention provides a polarizing plate, which is provided with a film-like polarizer and at least a pair of optical films containing resin, wherein the polarizer is located between the pair of optical films and overlaps the pair of optical films , Among the pair of optical films, at least one of the optical films is a protective film to protect the polarizer. The protective film is made of cycloolefin resin. In a plan view, there is a concave portion on the outer periphery or a through hole in the surface. The hole, in a side view, the end of the polarizer in the recess or the through hole is 15 μm to 56 μm more inside than the end of any one of the pair of optical films, and the end of the polarizer The part is exposed by contact with outside air.

在該偏光板中,在凹部內或貫通孔內,偏光片之端部係比光學膜之端部更靠內側15μm以上,故在熱衝擊試驗後在偏光片不會產生破裂,或即使產生亦成為破裂之長度短者。又,在該偏光板中,在凹部內或貫通孔內,偏光片之端部比光學膜之端部更凹陷的位置之距離為56μm以下,故將偏光板貼附於顯示單元時所使用之接著劑接觸於由環烯烴系樹脂所構成的保護膜之面積小,故在保護膜難以產生破裂。 In this polarizing plate, the end of the polarizer is 15 μm or more inside the end of the optical film in the recess or the through hole, so after the thermal shock test, the polarizer will not crack or even The generation also becomes the one with the shorter length of rupture. Moreover, in this polarizing plate, the distance between the position where the end of the polarizer is more recessed than the end of the optical film in the recess or the through hole is 56 μm or less. The adhesive used has a small contact area with the protective film made of cycloolefin resin, so it is difficult to cause cracks in the protective film.

在該偏光板中,偏光片可為在經延伸之聚乙烯醇系樹脂膜吸附定向有二色性色素而成者。 In the polarizing plate, the polarizing plate may be formed by adsorbing and oriented dichroic dye on the stretched polyvinyl alcohol-based resin film.

在該偏光板中,可在與具備保護膜之側為相反側之面更具備黏著劑(pressure-sensitive adhesive,又稱感壓型接著劑或壓敏接著劑)層。 In this polarizing plate, an adhesive (pressure-sensitive adhesive, also known as pressure-sensitive adhesive or pressure-sensitive adhesive) layer may be further provided on the side opposite to the side with the protective film.

在該偏光板中,一對之光學膜係任一者皆可為保護膜。 In the polarizing plate, any one of the pair of optical film systems can be a protective film.

在該偏光板中,在側視中,凹部內、或貫通孔內,一對之光學膜的端部彼此間之位置的差可為20μm以內。 In this polarizing plate, in a side view, the difference in the positions of the ends of the pair of optical films in the recesses or in the through holes may be within 20 μm.

又,本發明係提供一種包含上述偏光板之圖像顯示裝置。 In addition, the present invention provides an image display device including the above-mentioned polarizing plate.

又,本發明係提供一種製造上述偏光板之方法。亦即,本發明係提供一種偏光板之製造方法,其係具有切削步驟,該切削步驟係一面使旋轉切削工具接觸使膜狀之偏光片與至少一對之光學膜重疊而形成的積層體之側面,一面使旋轉切削工具沿著積層體之側面而移動;在俯視中,積層體係在外周設有凹部,或在面內設有貫通孔,一對之光學膜之中,至少一方之光學膜為保護偏光片之保護膜,保護膜係由環烯烴系樹脂所構成,在切削步驟中,在凹部內、或貫通孔內進行切削時,將旋轉切削工具之旋轉速度設為20000至35000rpm,將進給速度設為0.42至0.60m/分鐘,且將旋轉切削工具之旋轉的方向與進給之方向之關係設為上銑(up-cut,又稱逆銑),同時使旋轉切削工具從相對於偏光片之吸收軸方向呈垂直之方向進入而朝成為平行之方向移動。 In addition, the present invention provides a method of manufacturing the above-mentioned polarizing plate. In other words, the present invention provides a method of manufacturing a polarizing plate, which has a cutting step of contacting a rotating cutting tool to make a film-like polarizer overlap at least a pair of optical films to form a laminated body On the side surface, one side allows the rotary cutting tool to move along the side surface of the laminated body; in the top view, the laminated system is provided with a recess on the outer periphery or a through hole in the surface. Among a pair of optical films, at least one of the optical films In order to protect the protective film of the polarizer, the protective film is made of cycloolefin resin. In the cutting step, when cutting in the recess or in the through hole, the rotation speed of the rotary cutting tool is set to 20,000 to 35,000 rpm. The feed rate is set to 0.42 to 0.60m/min, and the relationship between the direction of rotation of the rotary cutting tool and the direction of feed is set to up-cut (also known as up-cut), and the rotary cutting tool It enters in a direction perpendicular to the absorption axis of the polarizer and moves in a parallel direction.

在該製造方法中,可將旋轉切削工具之旋轉速度設為25000至32000rpm,將進給速度設為0.45至0.50m/分鐘。 In this manufacturing method, the rotation speed of the rotary cutting tool can be set to 25000 to 32000 rpm, and the feed rate can be set to 0.45 to 0.50 m/min.

若依據本發明,可提供一種偏光板、及、該偏光板之製造方法,該偏光板係即使為具備由環烯烴系樹脂所構成的保護膜,亦可抑制凹部或貫通孔中之破裂。 According to the present invention, it is possible to provide a polarizing plate and a method for manufacturing the polarizing plate, which can suppress cracks in recesses or through holes even if the polarizing plate includes a protective film made of cycloolefin resin.

1:偏光板 1: Polarizing plate

1A:偏光板 1A: Polarizing plate

1p:偏光板之外周、外周 1p: Polarizing plate outer circumference, outer circumference

2:凹部 2: recess

2c:凹部之角落、角落 2c: corners and corners of recesses

2A:貫通孔 2A: Through hole

3:偏光片之吸收軸、吸收軸 3: The absorption axis and absorption axis of the polarizer

4:凹陷區域 4: Recessed area

4w:凹陷區域之寬度、寬度、距離 4w: width, width and distance of recessed area

5:第一光學膜、保護膜、光學膜 5: The first optical film, protective film, optical film

7:偏光片 7: Polarizer

7e:偏光片之端部、端部 7e: The end and the end of the polarizer

9:第二光學膜、光學膜 9: The second optical film, optical film

10,10’:第一積層體 10,10’: The first layered body

50:端銑刀 50: end mill

50a:端銑刀之旋轉軸線、旋轉軸線 50a: Rotation axis and rotation axis of end mill

50e:端銑刀之刀刃、刀刃 50e: blade and blade of end mill

100:第二積層體 100: The second layered body

d1:在端銑刀之側面刀刃延伸之方向、方向 d1: The direction and direction of the extension of the side edge of the end mill

d2:垂直於端銑刀之旋轉軸線的方向、方向 d2: The direction and direction perpendicular to the axis of rotation of the end mill

α:端銑刀之扭轉角、扭轉角 α: Torsion angle and torsion angle of end mill

β:切削角度 β: cutting angle

圖1係表示本發明之一實施型態的偏光板之表面(受光面)的示意圖。 FIG. 1 is a schematic diagram showing the surface (light-receiving surface) of a polarizing plate according to an embodiment of the present invention.

圖2係圖1之偏光板的II-II剖面圖。 Fig. 2 is a cross-sectional view of the polarizing plate of Fig. 1 taken along II-II.

圖3係在本發明之一實施型態的偏光板之製造方法中所形成的積層體之分解立體圖。 Fig. 3 is an exploded perspective view of a laminate formed in a method of manufacturing a polarizing plate according to an embodiment of the present invention.

圖4係在本發明之一實施型態的偏光板之製造方法中使用的端銑刀,以及以端銑刀切削之積層體的示意圖。 Fig. 4 is a schematic diagram of an end mill used in a method of manufacturing a polarizing plate according to an embodiment of the present invention, and a laminated body cut by the end mill.

圖5係表示在本發明之一實施型態的偏光板之製造方法中端銑刀進行移動之路徑的圖。 Fig. 5 is a diagram showing the moving path of the end mill in the method of manufacturing a polarizing plate according to an embodiment of the present invention.

圖6係表示本發明之另一實施型態的偏光板之表面(受光面)的示意圖。 6 is a schematic diagram showing the surface (light-receiving surface) of a polarizing plate according to another embodiment of the present invention.

以下,一邊參照圖面,一邊說明有關本發明之適當的實施型態。在圖面中,在同等之構成要素係賦予同等之符號。本發明係不受下述實施型態限定者。表示於各圖之X、Y及Z係意指互相正交之3個座標軸。各圖中之XYZ座標軸分別表示之方向係在各圖為共通。 Hereinafter, while referring to the drawings, suitable embodiments of the present invention will be described. In the drawings, equivalent components are given equivalent symbols. The present invention is not limited by the following embodiments. X, Y, and Z shown in each figure mean 3 coordinate axes orthogonal to each other. The directions indicated by the XYZ coordinate axes in each figure are the same in each figure.

(偏光板) (Polarizer)

圖1係表示本實施型態之偏光板1的表面(受光面)。於圖2所示之偏光板1的剖面係垂直於偏光板1之表面(受光面),且與位於凹部2之內側的偏光板1之外周1p正交。 Fig. 1 shows the surface (light-receiving surface) of the polarizing plate 1 of this embodiment. The cross section of the polarizing plate 1 shown in FIG. 2 is perpendicular to the surface (light-receiving surface) of the polarizing plate 1 and perpendicular to the outer circumference 1p of the polarizing plate 1 located inside the recess 2.

如圖1及圖2所示,本實施型態之偏光板1係構成略矩形,且具備至少一對之光學膜(5,9)及位於一對之光學膜(5,9)之間的膜狀之偏光片7。在下文中,為了說明上之方便,主要說明由偏光片7與一對之光學膜(5,9)所構成之偏光板1。 As shown in Figures 1 and 2, the polarizing plate 1 of this embodiment has a rectangular shape and is equipped with at least one pair of optical films (5, 9) and a pair of optical films (5, 9). Film-shaped polarizer 7. In the following, for the convenience of description, the polarizer 1 composed of a polarizer 7 and a pair of optical films (5, 9) will be mainly described.

所謂「光學膜」係意指構成偏光板1之膜狀的構件(偏光片7本身除外。)。例如,光學膜係意指包含保護膜及離型膜。各別之光學膜亦可不單獨具有特定之光學功能。「膜」(光學膜)係亦可改稱為「層」(光學層)。一對之光學膜(5,9)係分別包含樹脂。但光學膜(5,9)各者之組成並無限定。 The term "optical film" means a film-like member constituting the polarizing plate 1 (except for the polarizing plate 7 itself). For example, the optical film system means to include a protective film and a release film. The individual optical films may not have specific optical functions individually. "Film" (optical film) can also be renamed "layer" (optical layer). The pair of optical films (5, 9) each contain resin. However, the composition of each of the optical films (5, 9) is not limited.

偏光片7係與光學膜(5,9)分別直接或間接地重疊。例如,在偏光片7與光學膜(5,9)之間可具有別的光學膜。偏光片7亦可隔著接著層而與光學膜(5,9)分別重疊。 The polarizer 7 and the optical films (5, 9) overlap directly or indirectly, respectively. For example, there may be another optical film between the polarizer 7 and the optical film (5, 9). The polarizer 7 may be overlapped with the optical films (5, 9) via the adhesive layer.

如圖1所示,在偏光板1之外周1p形成凹部2。凹部2係亦可改稱為窪陷、缺口(cutout)或凹口(notch)。凹部2可在垂直於偏光板1之表面(受光面)的方向(Z軸方向)貫通偏光板1。所謂偏光板1之外周1p係亦可改稱為從與垂直於偏光板1之受光面的方向觀看之偏光板1(受光面)的外緣或輪廓。 As shown in FIG. 1, a concave portion 2 is formed on the outer circumference 1p of the polarizing plate 1. The recess 2 can also be renamed as a depression, a cutout or a notch. The recess 2 can penetrate the polarizing plate 1 in a direction (Z-axis direction) perpendicular to the surface (light-receiving surface) of the polarizing plate 1. The so-called outer periphery 1p of the polarizing plate 1 can also be changed to the outer edge or contour of the polarizing plate 1 (light-receiving surface) viewed from a direction perpendicular to the light-receiving surface of the polarizing plate 1.

凹部2較佳係設置在構成偏光板1之略矩形的邊之中,朝相對於偏光片之吸收軸3的方向略垂直的方向延伸之邊。就圖1而言,相對於朝圖示上下方向延伸之吸收軸,於圖示左右方向延伸之上邊中形成有凹部2。 The recessed portion 2 is preferably provided in the substantially rectangular side constituting the polarizer 1 and the side extending in a direction slightly perpendicular to the direction of the absorption axis 3 of the polarizer. With respect to FIG. 1, with respect to the absorption axis extending in the vertical direction in the figure, a recess 2 is formed in the upper side extending in the left-right direction in the figure.

沿著凹部2之偏光片7的端部7e之一部分或整體係比偏光板1之外周1p更靠內側。亦即,偏光板1係在其外緣部分具有:偏光片7之端部7e比一對之光學膜(5,9)之端部更朝內側凹陷之凹陷區域4。藉此,偏光板1之外周1p係存在二種,此二種外周1p係分別藉由一對之光學膜(5,9)之端部所形成。亦即,在偏光板1之表面(受光面)與其背面分別存在外周1p。圖1及圖2係表示一對之光學膜(5,9)的端部之位置在側視一致的情形。此時,偏光板1之外周1p與一對之光學膜(5,9)各者的端部係實質上為同意義。 A part or the whole of the end portion 7e of the polarizer 7 along the recess 2 is located inside the outer periphery 1p of the polarizer 1. That is, the polarizing plate 1 has at its outer edge a recessed area 4 in which the end 7e of the polarizer 7 is recessed more inwardly than the end of the pair of optical films (5, 9). Thus, there are two types of outer circumference 1p of the polarizing plate 1, and the two types of outer circumference 1p are respectively formed by the ends of a pair of optical films (5, 9). That is, the outer periphery 1p exists on the surface (light-receiving surface) of the polarizing plate 1 and the back surface, respectively. Figures 1 and 2 show a situation where the positions of the ends of a pair of optical films (5, 9) are the same in side view. At this time, the outer periphery 1p of the polarizing plate 1 and the end of each of the pair of optical films (5, 9) have substantially the same meaning.

偏光片7之端部7e朝向偏光板1之中央部分而後退的距離4w,亦即凹陷區域4之寬度4w係15μm至56μm。該距離4w可為25μm至55μm,亦可為30μm至50μm,亦可為35μm至45μm。又,上述範圍係可涵蓋偏光板1之整個外周1p被滿足,亦可僅在凹部2內被滿足。 The distance 4w that the end 7e of the polarizer 7 retreats toward the central part of the polarizer 1, that is, the width 4w of the recessed area 4 is 15 μm to 56 μm . The distance 4w may be 25 μm to 55 μm , may be 30 μm to 50 μm , or 35 μm to 45 μm . In addition, the above-mentioned range may be satisfied to cover the entire outer periphery 1p of the polarizing plate 1, or may be satisfied only in the recessed portion 2.

在凹陷區域4中,偏光片7之端部7e係以接觸外部空氣之方式露出。較宜為在凹陷區域4中,一對之光學膜(5,9)彼此間互相不接觸,至少並非成為在偏光板1之整個外周中一對之光學膜(5,9)彼此間接觸而封入偏光片7之狀態,而確保偏光片7之端部7e接觸外部空氣之通路。 In the recessed area 4, the end 7e of the polarizer 7 is exposed so as to contact the outside air. Preferably, in the recessed area 4, the pair of optical films (5, 9) are not in contact with each other, at least not so that the pair of optical films (5, 9) are in contact with each other in the entire outer periphery of the polarizing plate 1. The state where the polarizer 7 is enclosed, and the passage for the end 7e of the polarizer 7 to contact the outside air is ensured.

偏光板中,一般而言,偏光片7及光學膜(5,9)各者伴隨濕度或溫度之變化的收縮率或膨脹率相異。因此,伴隨濕度或溫度之變化,應力容易集中於偏光片7及光學膜(5,9)各者的端部所露出之凹部2,在凹部2容易產生起因於應力之破裂(龜裂)。再者,偏光片7包含由聚乙烯醇與碘所構成的錯合物時,露出於凹部2之偏光片7係容易因曝露於濕氣、熱或光(紫外線)而劣化,在露出於凹部2之偏光片7中容易產生破裂。由於應力集中於凹部2,在偏光片7與光學膜(5,9)之邊界附近容易產生破裂。又,濕氣會經由偏光片7與光學膜(5,9)之邊 界,從凹部2入侵至偏光板1內,因此,偏光片7及光學膜(5,6)各者容易劣化,並容易引起偏光片7及光學膜(5,6)之剝離,在偏光板1之凹部2容易產生破裂。 In the polarizing plate, in general, the polarizer 7 and the optical films (5, 9) have different shrinkage rates or expansion rates due to changes in humidity or temperature. Therefore, with changes in humidity or temperature, stress tends to be concentrated in the recesses 2 exposed at the ends of each of the polarizer 7 and the optical films (5, 9), and cracks (cracks) due to stress are likely to occur in the recesses 2. Furthermore, when the polarizer 7 contains a complex composed of polyvinyl alcohol and iodine, the polarizer 7 exposed in the concave portion 2 is easily degraded by exposure to moisture, heat, or light (ultraviolet rays), and is exposed to the concave portion. The polarizer 7 of 2 is prone to cracks. Since the stress is concentrated in the concave portion 2, cracks are likely to occur near the boundary between the polarizer 7 and the optical film (5, 9). In addition, moisture will pass through the side of the polarizer 7 and the optical film (5, 9) The boundary invades from the recess 2 into the polarizing plate 1. Therefore, the polarizing film 7 and the optical film (5, 6) are each easily degraded, and the polarizing film 7 and the optical film (5, 6) are likely to be peeled off. The recess 2 of 1 is prone to cracks.

然而,在本實施型態之偏光板1中,因偏光片7之端部7e朝向偏光板1之中央部分而後退的距離4w為15μm以上,故在偏光片7不易產生破裂。又,假設即使產生破裂,容易變成其長度為1200μm以下之輕微者。再者,雖然偏光片7之端部7e露出於外部空氣,但因存在凹陷區域4,故在偏光板之端部結露時,水不易接觸偏光片7之端部7e。又,因距離4w為56μm以下,故將偏光板1貼附於顯示單元時所使用之透明硬化性接著劑接觸一對之光學膜(5,9)(其中,特別是由後述之環烯烴系樹脂所構成的保護膜)之內側面的面積變小,因此,在保護膜不易產生破裂。又,若距離4w超過56μm,一對之光學膜(5,9)之端部彼此間變得容易接觸。 However, in the polarizing plate 1 of this embodiment, since the end 7e of the polarizing plate 7 retreats toward the center of the polarizing plate 1 by a distance 4w of 15 μm or more, the polarizing plate 7 is unlikely to be cracked. Furthermore, even if cracks occur, the length is likely to be as slight as 1200 μm or less. Furthermore, although the end 7e of the polarizer 7 is exposed to the outside air, since there is a recessed area 4, it is difficult for water to contact the end 7e of the polarizer 7 when dew is formed at the end of the polarizer. In addition, since the distance 4w is 56 μm or less, the transparent curable adhesive used when attaching the polarizing plate 1 to the display unit contacts the pair of optical films (5, 9) (in particular, the ring is described later). The area of the inner side surface of the protective film made of olefin-based resin is reduced, and therefore, the protective film is less likely to be cracked. In addition, if the distance 4w exceeds 56 μm , the ends of the pair of optical films (5, 9) become easy to contact each other.

在偏光板1中,凹部2之內側之角落2c可為曲面。亦即,位於凹部2的內側之角落2c的偏光板1之端面可為曲面。亦即,凹部之內側之角落2c可被倒角(chamfer)。由於凹部2之內側之角落2c為曲面,故容易控制凹部2之內側的角落2c中之破裂。如圖1所示,位於凹部2之兩端的角部、及位於偏光板1之四角落的角部分別可被倒角。 In the polarizing plate 1, the inner corner 2c of the recess 2 may be a curved surface. That is, the end surface of the polarizing plate 1 located at the corner 2c inside the recess 2 may be a curved surface. That is, the inner corner 2c of the recess can be chamfered. Since the inner corner 2c of the concave portion 2 is a curved surface, it is easy to control cracks in the inner corner 2c of the concave portion 2. As shown in FIG. 1, the corners at both ends of the recess 2 and the corners at the four corners of the polarizing plate 1 can be chamfered, respectively.

凹部2之寬度(在X軸方向之凹部2的寬度)並無特別限定,但,例如,可為3mm以上160mm以下。凹部2之深度(在Y軸方向之凹部2之寬度)並無特別限定,但,例如,可為0.5mm以上160mm以下。形成凹部2之偏光板1的邊(短邊)之長度並無特別限定,但,例如,可為30mm以上90mm以下。不形成凹部2之偏光板1的邊(長邊)之長度並無特別限定,但,例如,可為30mm 以上170mm以下。偏光板1整體之厚度並無特別限定,但,例如,可為30μm以上300μm以下。 The width of the recess 2 (the width of the recess 2 in the X-axis direction) is not particularly limited, but, for example, it may be 3 mm or more and 160 mm or less. The depth of the recess 2 (the width of the recess 2 in the Y-axis direction) is not particularly limited, but, for example, it may be 0.5 mm or more and 160 mm or less. The length of the side (short side) of the polarizing plate 1 forming the recess 2 is not particularly limited, but, for example, it may be 30 mm or more and 90 mm or less. The length of the side (long side) of the polarizing plate 1 where the recess 2 is not formed is not particularly limited, but, for example, it may be 30 mm or more and 170 mm or less. The thickness of the entire polarizing plate 1 is not particularly limited, but, for example, it may be 30 μm or more and 300 μm or less.

圖1所示之凹部2為四角形狀(長方形狀)。但,凹部2之形狀不受限定。例如,凹部2可為正方形狀。凹部2可為四角形及三角形以外之其他之多角形。又,凹部2之形狀可為半圓。凹部2可由直線與曲線所構成。圖1所示之偏光板1之形狀任一者皆具有對稱性,但偏光板1之形狀可為非對稱性。複數個凹部2可形成於偏光板1之外周1p。複數個凹部2可形成於構成偏光板1之外周1p的一個邊。亦可藉由將四角形狀之偏光板1的四個角部之中的至少一個角部予以切除,而形成凹部2。 The recess 2 shown in FIG. 1 has a quadrangular shape (rectangular shape). However, the shape of the recess 2 is not limited. For example, the recess 2 may have a square shape. The recess 2 may be a polygonal shape other than a quadrangle or a triangle. In addition, the shape of the recess 2 may be a semicircle. The recess 2 can be composed of straight lines and curved lines. Any shape of the polarizing plate 1 shown in FIG. 1 has symmetry, but the shape of the polarizing plate 1 may be asymmetric. A plurality of recesses 2 may be formed on the outer circumference 1p of the polarizing plate 1. A plurality of recesses 2 may be formed on one side constituting the outer circumference 1p of the polarizing plate 1. It is also possible to form the recess 2 by cutting at least one of the four corners of the quadrangular polarizing plate 1.

凹部2除外之偏光板1的整體形狀為約略四角形(長方形)。但,偏光板1之形狀不受限定。例如,偏光板1之形狀可為正方形。偏光板1之形狀係可為四角形以外之多角形、圓形、或橢圓形。偏光片7及光學膜(5,9)各者之整體形狀可為與偏光板1之形狀略相同。圖1所示之長方形狀之偏光板1的情形,凹部2係形成於偏光板1之短邊,但凹部2係亦可形成於偏光板1之長邊。 The overall shape of the polarizing plate 1 except for the concave portion 2 is approximately quadrangular (rectangular). However, the shape of the polarizing plate 1 is not limited. For example, the shape of the polarizing plate 1 may be a square. The shape of the polarizing plate 1 can be a polygonal shape other than a quadrangular shape, a circular shape, or an elliptical shape. The overall shape of each of the polarizer 7 and the optical films (5, 9) may be slightly the same as the shape of the polarizer 1. In the case of the rectangular polarizing plate 1 shown in FIG. 1, the concave portion 2 is formed on the short side of the polarizing plate 1, but the concave portion 2 may be formed on the long side of the polarizing plate 1.

偏光片7係可為藉由延伸、染色及交聯等步驟所製作的膜狀聚乙烯醇系樹脂(PVA膜)。尤其,較佳係吸附定向有二色性色素者,如此之偏光片7的作成方法之詳細內容如下所述。 The polarizer 7 may be a film-like polyvinyl alcohol resin (PVA film) produced through steps such as stretching, dyeing, and crosslinking. In particular, it is preferable to adsorb and oriented dichroic dyes. The details of the method for preparing such a polarizer 7 are as follows.

例如,首先,將PVA膜朝單軸方向或二軸方向進行延伸。朝單軸方向延伸之偏光片7的二色比較容易變高。延伸後,繼而使用染色液,將PVA膜藉由碘、二色性色素(聚碘)或有機染料進行染色。染色液係可含有硼酸、硫酸鋅、或氯化鋅。在染色前,可水洗PVA膜。藉由水洗,從PVA膜之表面去除汙垢及抗結塊劑。又,因為水洗而讓PVA膜膨潤之結果,容易抑制染色之斑紋(不 均勻的染色)。為了交聯,將染色後之PVA膜以交聯劑之溶液(例如,硼酸之水溶液)處理。以交聯劑進行處理後,水洗PVA膜,繼而進行乾燥。經過以上之順序可獲得偏光片7。聚乙烯醇(PVA)系樹脂係可藉由使聚乙酸乙烯酯系樹脂進行皂化而得。聚乙酸乙烯酯系樹脂例如可為屬於乙酸乙烯酯之均聚物的聚乙酸乙烯酯、或乙酸乙烯酯與其他之單體的共聚物(例如,乙烯-乙酸乙烯酯共聚物)。與乙酸乙烯酯進行共聚合之其他的單體係除了乙烯之外,可為不飽和羧酸類、烯烴類、乙烯醚類、不飽和磺酸類、或具有銨基之丙烯醯胺類。聚乙烯醇系樹脂係可以醛類改質。經改質之聚乙烯醇系樹脂例如可為部分甲醛化聚乙烯醇、聚乙烯乙縮醛、或聚乙烯丁縮醛。聚乙烯醇系樹脂係可為聚乙烯醇之去水處理物、或聚氯乙烯之去鹽酸處理物等之聚烯系定向膜。亦可在延伸前進行染色,亦可在染色液中進行延伸。經延伸之偏光片7之長度例如可為延伸前之長度的3至7倍。 For example, first, the PVA film is stretched in a uniaxial direction or a biaxial direction. The two colors of the polarizer 7 extending in the uniaxial direction are relatively easy to increase. After the extension, the dyeing solution is then used to dye the PVA film with iodine, dichroic dye (polyiodine) or organic dye. The dyeing solution may contain boric acid, zinc sulfate, or zinc chloride. Before dyeing, the PVA film can be washed with water. By washing with water, dirt and anti-caking agent are removed from the surface of the PVA film. In addition, as a result of the swelling of the PVA film due to washing with water, it is easy to suppress staining spots (not Uniform dyeing). For cross-linking, the dyed PVA film is treated with a solution of a cross-linking agent (for example, an aqueous solution of boric acid). After treatment with a crosslinking agent, the PVA film is washed with water and then dried. After the above sequence, the polarizer 7 can be obtained. The polyvinyl alcohol (PVA)-based resin system can be obtained by saponifying a polyvinyl acetate-based resin. The polyvinyl acetate resin may be, for example, polyvinyl acetate which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and other monomers (for example, ethylene-vinyl acetate copolymer). In addition to ethylene, the other single systems for copolymerization with vinyl acetate may be unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, or acrylamides with ammonium groups. Polyvinyl alcohol-based resins can be modified with aldehydes. The modified polyvinyl alcohol-based resin may be, for example, partially formalized polyvinyl alcohol, polyvinyl acetal, or polyvinyl butyral. The polyvinyl alcohol-based resin system may be a polyolefin-based oriented film such as a dewatering treatment product of polyvinyl alcohol, or a polyvinyl chloride treatment product of polyvinyl chloride. It can also be dyed before extension, or it can be extended in a dye solution. The length of the stretched polarizer 7 can be, for example, 3 to 7 times the length before the stretch.

偏光片7之厚度例如可為1μm以上50μm以下、或3μm以上15μm以下。偏光片7愈薄,愈可抑制伴隨溫度變化之偏光片7本身之收縮或膨脹,並抑制偏光片7本身之尺寸的變化。其結果,應力難以作用於偏光片7,並容易抑制在偏光片7之破裂。 The thickness of the polarizer 7 may be, for example, 1 μm or more and 50 μm or less, or 3 μm or more and 15 μm or less. The thinner the polarizer 7 is, the more the shrinkage or expansion of the polarizer 7 itself associated with temperature changes can be suppressed, and the size change of the polarizer 7 itself can be suppressed. As a result, it is difficult for stress to act on the polarizer 7 and it is easy to suppress cracking in the polarizer 7.

本實施型態係一對之光學膜(5,9)之中,一者係由環烯烴系樹脂(以下亦稱為「環狀烯烴聚合物系樹脂」。)所構成的保護膜。 The present embodiment is a pair of optical films (5, 9), one of which is a protective film composed of cycloolefin resin (hereinafter also referred to as "cyclic olefin polymer resin").

在下文中,為了說明上的方便,將一對之光學膜(5,9)之中之一者標記為保護膜5,將另一者標記為光學膜9。 Hereinafter, for the convenience of description, one of the pair of optical films (5, 9) is labeled as the protective film 5, and the other is labeled as the optical film 9.

光學膜9可為具有透光性之熱塑性樹脂。光學膜9可為光學上透明的熱塑性樹脂。構成光學膜9之樹脂例如可為鏈狀聚烯烴系樹脂、環狀烯烴聚合物系樹脂(COP系樹脂)、纖維素酯系樹脂、聚酯系樹脂、聚碳酸酯系樹脂、(甲 基)丙烯酸系樹脂、聚苯乙烯系樹脂、或此等之混合物或共聚物。光學膜9可包含環狀烯烴聚合物系樹脂(COP系樹脂)。光學膜9分別包含環狀烯烴聚合物系樹脂(COP系樹脂)時,容易獲得本發明之效果。保護膜5及光學膜9各者之玻璃轉移溫度較佳係100℃以上200℃以下,或120℃以上150℃以下。 The optical film 9 may be a thermoplastic resin having translucency. The optical film 9 may be an optically transparent thermoplastic resin. The resin constituting the optical film 9 may be, for example, a chain polyolefin resin, a cyclic olefin polymer resin (COP resin), a cellulose ester resin, a polyester resin, a polycarbonate resin, (former Base) Acrylic resin, polystyrene resin, or mixtures or copolymers of these. The optical film 9 may contain a cyclic olefin polymer-based resin (COP-based resin). When each of the optical films 9 contains a cyclic olefin polymer resin (COP-based resin), the effects of the present invention are easily obtained. The glass transition temperature of each of the protective film 5 and the optical film 9 is preferably 100°C or more and 200°C or less, or 120°C or more and 150°C or less.

鏈狀聚烯烴系樹脂例如可為如聚乙烯樹脂或聚丙烯樹脂之鏈狀烯烴的均聚物。鏈狀聚烯烴系樹脂係可為由二種以上之鏈狀烯烴所構成的共聚物。 The chain polyolefin resin may be, for example, a homopolymer of chain olefin such as polyethylene resin or polypropylene resin. The chain polyolefin resin system may be a copolymer composed of two or more chain olefins.

環狀烯烴聚合物系樹脂(環狀聚烯烴系樹脂)例如可為環狀烯烴之開環(共)聚合物、或環狀烯烴之加成聚合物。環狀烯烴聚合物系樹脂例如可為環狀烯烴與鏈狀烯烴之共聚物(例如,隨機共聚物)。構成共聚物之鏈狀烯烴例如可為乙烯或丙烯。環狀烯烴聚合物系樹脂係可為使上述之聚合物以不飽和羧酸或其衍生物經改質之接枝聚合物、或其等之氫化物。環狀烯烴聚合物系樹脂例如可為降莰烯或多環降莰烯系單體等之使用降莰烯系單體的降莰烯系樹脂。又,上述之環狀烯烴聚合物系樹脂亦可使用來作為構成保護膜5之材料。 The cyclic olefin polymer resin (cyclic polyolefin resin) may be, for example, a ring-opening (co)polymer of cyclic olefin or an addition polymer of cyclic olefin. The cyclic olefin polymer resin may be, for example, a copolymer of a cyclic olefin and a chain olefin (for example, a random copolymer). The chain olefin constituting the copolymer may be, for example, ethylene or propylene. The cyclic olefin polymer resin system may be a graft polymer obtained by modifying the above-mentioned polymer with an unsaturated carboxylic acid or a derivative thereof, or a hydrogenated product thereof. The cyclic olefin polymer-based resin may be, for example, a norbornene-based resin using a norbornene-based monomer, such as a norbornene or a polycyclic norbornene-based monomer. In addition, the above-mentioned cyclic olefin polymer resin can also be used as a material constituting the protective film 5.

纖維素酯系樹脂例如可為纖維素三乙酸酯(三乙酸纖維素(TAC))、纖維素二乙酸酯、纖維素三丙酸酯或纖維素二丙酸酯。亦可為此等之共聚物。亦可使用羥基之一部分以其他之取代基修飾過之纖維素酯系樹脂。 The cellulose ester resin may be, for example, cellulose triacetate (cellulose triacetate (TAC)), cellulose diacetate, cellulose tripropionate, or cellulose dipropionate. It can also be such copolymers. It is also possible to use a cellulose ester resin in which a part of the hydroxyl group is modified with other substituents.

可使用纖維素酯系樹脂以外之聚酯系樹脂。聚酯系樹脂例如可為多價羧酸或其衍生物與多元醇之聚縮合物。多價羧酸或其衍生物係可為二羧酸或其衍生物。多價羧酸或其衍生物例如可為對苯二甲酸、鄰苯二甲酸、對苯二甲酸二甲酯、或萘二羧酸二甲酯。多元醇例如可為二元醇。多元醇係例如可為乙二醇、丙二醇、丁二醇、新戊二醇、或環己烷二甲醇。 Polyester resins other than cellulose ester resins can be used. The polyester resin may be, for example, a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol. The polyvalent carboxylic acid or its derivative may be a dicarboxylic acid or its derivative. The polyvalent carboxylic acid or its derivative may be, for example, terephthalic acid, phthalic acid, dimethyl terephthalate, or dimethyl naphthalene dicarboxylate. The polyol may be, for example, a dihydric alcohol. The polyol system may be, for example, ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, or cyclohexane dimethanol.

聚酯系樹脂例如可為聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯、聚萘二甲酸丁二酯、聚對苯二甲酸三亞甲酯、聚萘二甲酸三亞甲酯、聚對苯二甲酸環己烷二甲酯、或聚萘二甲酸環己烷二甲酯。 The polyester resin may be, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, Polytrimethylene naphthalate, polycyclohexane dimethyl terephthalate, or polycyclohexane dimethyl naphthalate.

聚碳酸酯系樹脂係隔著碳酸酯基而鍵結聚合單元(單體)而成之聚合物。聚碳酸酯系樹脂係可為具有經修飾之聚合物骨架的改質聚碳酸酯,亦可為共聚合聚碳酸酯。 The polycarbonate resin is a polymer in which a polymerized unit (monomer) is bonded via a carbonate group. The polycarbonate resin system may be a modified polycarbonate with a modified polymer skeleton, or a copolymerized polycarbonate.

(甲基)丙烯酸系樹脂例如可為聚(甲基)丙烯酸酯(例如,聚甲基丙烯酸甲酯(PMMA));甲基丙烯酸甲酯-(甲基)丙烯酸共聚物;甲基丙烯酸甲酯-(甲基)丙烯酸酯共聚物;甲基丙烯酸甲酯-丙烯酸酯-(甲基)丙烯酸共聚物;(甲基)丙烯酸甲酯-苯乙烯共聚物(例如,MS樹脂);甲基丙烯酸甲酯與具有脂環族烴基之化合物的共聚物(例如,甲基丙烯酸甲酯-甲基丙烯酸環己酯共聚物、甲基丙烯酸甲酯-(甲基)丙烯酸降莰酯共聚物等)。 The (meth)acrylic resin may be, for example, poly(meth)acrylate (for example, polymethyl methacrylate (PMMA)); methyl methacrylate-(meth)acrylic acid copolymer; methyl methacrylate -(Meth)acrylate copolymer; methyl methacrylate-acrylate-(meth)acrylic acid copolymer; methyl (meth)acrylate-styrene copolymer (for example, MS resin); methyl methacrylate A copolymer of an ester and a compound having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate-norbornyl (meth)acrylate copolymer, etc.).

保護膜5或光學膜9分別可含有選自由滑劑、塑化劑、分散劑、熱安定劑、紫外線吸收劑、紅外線吸收劑、抗靜電劑、及抗氧化劑所成之群中的至少一種之添加劑。 The protective film 5 or the optical film 9 may respectively contain at least one selected from the group consisting of slip agents, plasticizers, dispersants, heat stabilizers, ultraviolet absorbers, infrared absorbers, antistatic agents, and antioxidants. additive.

保護膜5之厚度例如可為5μm以上90μm以下、或10μm以上60μm以下。光學膜9之厚度亦可為例如5μm以上90μm以下、或10μm以上60μm以下。 The thickness of the protective film 5 may be, for example, 5 μm or more and 90 μm or less, or 10 μm or more and 60 μm or less. The thickness of the optical film 9 may be, for example, 5 μm or more and 90 μm or less, or 10 μm or more and 60 μm or less.

保護膜5及光學膜9之中至少一者可為具有光學功能之膜。具有光學功能之膜係例如可為相位差膜或增亮膜。例如,藉由將由上述熱塑性樹脂所構成的膜進行延伸,或在該膜上形成液晶層等,可獲得賦予任意之相位差值的相位差膜。 At least one of the protective film 5 and the optical film 9 may be a film with optical functions. The film system having an optical function may be, for example, a retardation film or a brightness enhancement film. For example, by stretching a film made of the above-mentioned thermoplastic resin, or forming a liquid crystal layer on the film, a retardation film with an arbitrary retardation value can be obtained.

保護膜5係可隔著接著層而重疊於偏光片7。光學膜9亦可隔著接著層而重疊於偏光片7。接著層係可包含聚乙烯醇等之水系接著劑。接著層係可包含後述之活性能量線硬化性樹脂。 The protective film 5 can be superimposed on the polarizer 7 via an adhesive layer. The optical film 9 may be superimposed on the polarizer 7 via an adhesive layer. The adhering layer may include an aqueous adhesive such as polyvinyl alcohol. The subsequent layer system may include the active energy ray curable resin described later.

活性能量線硬化性樹脂係藉由照射活性能量線,進行硬化之樹脂。活性能量線係例如可為紫外線、可見光、電子線、或X線。例如,活性能量線硬化性樹脂係可為紫外線硬化性樹脂。 Active energy ray curable resin is a resin that is cured by irradiating active energy rays. The active energy ray system may be, for example, ultraviolet rays, visible light, electron rays, or X rays. For example, the active energy ray curable resin system may be an ultraviolet curable resin.

活性能量線硬化性樹脂係可為一種之樹脂,亦可為複數種之樹脂。例如,活性能量線硬化性樹脂係可包含陽離子聚合性之硬化性化合物、或自由基聚合性之硬化性化合物。活性能量線硬化性樹脂係可包含用以使上述硬化性化合物之硬化反應起始的陽離子聚合開始劑或自由基聚合起始劑。 The active energy ray-curable resin can be one type of resin or multiple types of resins. For example, the active energy ray curable resin may contain a cation polymerizable curable compound or a radical polymerizable curable compound. The active energy ray curable resin system may contain a cationic polymerization initiator or a radical polymerization initiator for initiating the curing reaction of the above-mentioned curable compound.

陽離子聚合性之硬化性化合物例如可為環氧系化合物(在分子內具有至少一個環氧基之化合物)、或氧環丁烷系化合物(在分子內至少具有一個氧環丁烷環之化合物)。自由基聚合性之硬化性化合物例如可為(甲基)丙烯酸系化合物(在分子內至少具有一個之(甲基)丙烯醯氧基之化合物)。自由基聚合性之硬化性化合物係可為具有自由基聚合性之雙鍵的乙烯基系化合物。 The cationically polymerizable curable compound can be, for example, an epoxy-based compound (a compound having at least one epoxy group in the molecule) or an oxetane-based compound (a compound having at least one oxetane ring in the molecule) . The radically polymerizable curable compound may be, for example, a (meth)acrylic compound (a compound having at least one (meth)acryloxy group in the molecule). The radically polymerizable curable compound may be a vinyl compound having a radically polymerizable double bond.

活性能量線硬化性樹脂係依需要而可包含陽離子聚合促進劑、離子捕捉劑、抗氧化劑、鏈移動劑、增黏劑、熱塑性樹脂、填充劑、流動調整劑、塑化劑、消泡劑、抗靜電劑、流平劑、或溶劑等。 Active energy ray curable resins may contain cationic polymerization accelerators, ion scavengers, antioxidants, chain transfer agents, tackifiers, thermoplastic resins, fillers, flow regulators, plasticizers, defoamers, Antistatic agent, leveling agent, or solvent, etc.

(圖像顯示裝置) (Image display device)

有關本實施型態之圖像顯示裝置係包含上述之偏光板1。圖像顯示裝置例如可為液晶顯示裝置或有機EL顯示裝置等。例如,液晶顯示裝置具有之液晶面板可具備液晶單元、及重疊於液晶單元之一表面之上述偏光板1。或是,液晶顯示 裝置具有之液晶面板亦可具備一對之上述偏光板1、及配置於一對之上述偏光板1之間、且與各偏光板1重疊的液晶單元。偏光板1係亦可於與具備保護膜5之側為相反側之面具備黏著劑層,亦可隔著該黏著劑層而重疊於液晶單元。 The image display device of this embodiment includes the above-mentioned polarizing plate 1. The image display device may be, for example, a liquid crystal display device, an organic EL display device, or the like. For example, a liquid crystal panel included in a liquid crystal display device may include a liquid crystal cell and the above-mentioned polarizing plate 1 overlapped on one surface of the liquid crystal cell. Or, LCD display The liquid crystal panel included in the device may include a pair of the above-mentioned polarizing plates 1 and a liquid crystal cell arranged between the pair of the above-mentioned polarizing plates 1 and overlapping with each of the polarizing plates 1. The polarizing plate 1 may be provided with an adhesive layer on the side opposite to the side provided with the protective film 5, and may be overlapped on the liquid crystal cell via the adhesive layer.

(偏光板之製造方法) (Method of manufacturing polarizing plate)

有關本實施型態之偏光板1的製造方法係具備:積層步驟,其係將膜狀之偏光片與至少一對之光學膜重疊,形成積層體;及,切削步驟,其係使端銑刀接觸於積層體之外周,而使端銑刀沿著積層體之外周而移動。 The manufacturing method of the polarizing plate 1 related to this embodiment includes: a layering step of overlapping a film-like polarizer with at least a pair of optical films to form a layered body; and a cutting step of using an end mill The end mill is brought into contact with the outer circumference of the laminated body, and the end mill is moved along the outer circumference of the laminated body.

在積層步驟係藉由將長條的帶狀偏光片膜與至少一對之長條的帶狀光學膜重疊而互相貼合,製作積層體(第一積層體)。所謂長條的帶狀偏光片膜,係指加工/成形前之偏光片7。所謂長條的帶狀複數之光學膜係加工/成形前之光學膜(5,9)。在積層步驟係以偏光片膜配置於一對之光學膜之間之方式,將偏光片膜及一對之光學膜重疊,並形成偏光板(圖3)。又,該積層體可為在光學膜上隔著感壓型接著劑層而更具備分離膜而成者。分離膜係在其後可從感壓型接著劑層剝離。 In the lamination step, the long strip-shaped polarizer film and at least one pair of long strip-shaped optical films are overlapped and bonded to each other to produce a layered body (first layered body). The so-called long strip polarizer film refers to the polarizer 7 before processing/forming. The so-called long strip-shaped plural optical films are optical films before processing/forming (5, 9). In the layering step, the polarizer film is arranged between the pair of optical films, and the polarizer film and the pair of optical films are overlapped to form a polarizing plate (Figure 3). In addition, the laminated body may further include a separation film via a pressure-sensitive adhesive layer on the optical film. The separation film can be peeled from the pressure-sensitive adhesive layer thereafter.

繼而,在切削步驟之前,藉由沖孔加工、或裁切加工,在第一積層體之外周形成凹部。裁切加工之手段係可使用刀刃或雷射。惟,僅沖孔加工或裁切加工係難以形成上述之凹陷區域。將經沖孔之第一積層體10稱為「第一積層體10’」。 Then, prior to the cutting step, a recessed portion is formed on the outer periphery of the first laminate by punching processing or cutting processing. The cutting method can be a knife or laser. However, it is difficult to form the above-mentioned recessed area only by punching or cutting. The punched first laminated body 10 is referred to as "first laminated body 10'".

如圖4及圖5所示,在切削步驟所使用之端銑刀(旋轉切削工具)50係在略平行於其旋轉軸線50a之側面具有突出之刀刃(edge)50e。在切削步驟係使端銑刀50之側面接觸第一積層體10’之外周(端面),使進行旋轉之端銑刀50沿著形成有凹部之第一積層體10’之外周而移動。 As shown in FIGS. 4 and 5, the end mill (rotary cutting tool) 50 used in the cutting step has a protruding edge 50e on the side surface slightly parallel to the rotation axis 50a. In the cutting step, the side surface of the end mill 50 is brought into contact with the outer periphery (end surface) of the first laminated body 10', and the rotating end mill 50 is moved along the outer periphery of the first laminated body 10' in which the recesses are formed.

例如,可使進行旋轉之端銑刀50沿著圖5中之外周的箭號所示之路徑而移動。其結果,形成有凹部之第一積層體10’之外周(端面)係被刀刃50e所切削或研磨,第一積層體10’之外周(端面)變得平滑,且形成凹部2,凹部2之內側之角落被倒角。如圖4所示,可使複數個第一積層體10’重疊而形成第二積層體100之後,使端銑刀50之側面接觸於第二積層體100之外周(端面),使進行旋轉之端銑刀50沿著第二積層體100之外周而移動。亦即,在切削步驟係可將構成第二積層體100之複數個第一積層體10’之外周以端銑刀50一次全部予以切削或研磨。在切削步驟中,位於凹部2之兩端的角部、及位於第一積層體10之四個角落的角部可分別被倒角。 For example, the rotating end mill 50 can be moved along the path shown by the arrow on the outer circumference in FIG. 5. As a result, the outer periphery (end surface) of the first laminated body 10' in which the recessed portion is formed is cut or polished by the blade 50e, the outer periphery (end surface) of the first laminated body 10' becomes smooth, and the recessed portion 2 is formed. The inner corners are chamfered. As shown in FIG. 4, after a plurality of first laminated bodies 10' can be overlapped to form a second laminated body 100, the side surface of the end mill 50 is brought into contact with the outer periphery (end surface) of the second laminated body 100 to rotate The end mill 50 moves along the outer circumference of the second laminated body 100. That is, in the cutting step, the outer periphery of the plurality of first laminated bodies 10' constituting the second laminated body 100 can be cut or polished all at once with the end mill 50. In the cutting step, the corners located at both ends of the recessed portion 2 and the corners located at the four corners of the first laminated body 10 can be respectively chamfered.

在切削步驟中之端銑刀的進給速度係設為0.42至0.60m/分鐘,該速度可為0.45至0.60m/分鐘,亦可為0.50至0.55m/分鐘。 The feed speed of the end mill in the cutting step is set at 0.42 to 0.60 m/min, and the speed can be 0.45 to 0.60 m/min, or 0.50 to 0.55 m/min.

若端銑刀之進給速度在上述之範圍內,則形成偏光片7之端部e比保護膜之端部更朝內側凹陷之形狀。 If the feed speed of the end mill is within the above-mentioned range, the end e of the polarizer 7 is formed into a shape that is recessed toward the inner side than the end of the protective film.

從使偏光片7之端部7e凹陷之觀點而言,在切削步驟中之端銑刀之旋轉速度係例如可為20000至35000rpm,較佳係25000至32000rpm。又,從同樣之觀點,在切削步驟中之切削角度例如可為30°以上70°以下,較佳係45°以上65°以下。端銑刀50之扭轉角為α之時,切削角度β係定義為90°-α,如圖4所示,端銑刀50之扭轉角α係在端銑刀50之側面中由刀刃50e延伸之方向d1與端銑刀50之旋轉軸線50a所構成的角度。切削角度β係亦可改稱為由刀刃50e延伸之方向d1與垂直於旋轉軸線50a之方向d2所構成的角度。使用於切削步驟之端銑刀50之直徑

Figure 109124276-A0202-12-0014-9
(粗細)例如可為3.0mm以上6.0mm以下。 From the viewpoint of recessing the end 7e of the polarizer 7, the rotation speed of the end mill in the cutting step may be, for example, 20,000 to 35,000 rpm, preferably 25,000 to 32,000 rpm. Also, from the same point of view, the cutting angle in the cutting step may be, for example, 30° or more and 70° or less, preferably 45° or more and 65° or less. When the torsion angle of the end mill 50 is α, the cutting angle β is defined as 90°-α. As shown in Fig. 4, the torsion angle α of the end mill 50 extends from the edge 50e in the side of the end mill 50 The angle formed by the direction d1 of the end mill 50 and the rotation axis 50a of the end mill 50. The cutting angle β can also be renamed as the angle formed by the direction d1 in which the cutting edge 50e extends and the direction d2 perpendicular to the rotation axis 50a. The diameter of the end mill 50 used in the cutting step
Figure 109124276-A0202-12-0014-9
(Thickness) can be 3.0 mm or more and 6.0 mm or less, for example.

切削步驟中之端銑刀50的進給速度係可表示為V[m/分]或V/60[m/秒]。在切削步驟中之端銑刀50的旋轉速度係可表示為R[rpm]或R/60[rps]。在切削步驟中之端銑刀50的抵接次數係定義為R/V[次/m]。抵接次數係意指端銑刀50接觸於第一積層體10之外周的單位長度(1m)之次數。在切削步驟中之端銑刀50的抵接次數R/V較佳係30,000次/m以上90,000次/m以下、40,000次/m以上80,000次/m以下、或45,000次/m以上75,000次/m以下。 The feed speed of the end mill 50 in the cutting step can be expressed as V [m/min] or V/60 [m/sec]. The rotation speed of the end mill 50 in the cutting step can be expressed as R [rpm] or R/60 [rps]. The number of contact times of the end mill 50 in the cutting step is defined as R/V [times/m]. The number of contact times means the number of times the end mill 50 contacts the outer circumference of the first laminated body 10 per unit length (1 m). The number of contact R/V of the end mill 50 in the cutting step is preferably 30,000 times/m or more and 90,000 times/m or less, 40,000 times/m or more and 80,000 times/m or less, or 45,000 times/m or more and 75,000 times/m or more. m or less.

在切削步驟中,切削凹部2內時,係將端銑刀50之旋轉的方向與進給之方向之關係設為上銑。在此所謂上銑係在端銑刀50與第一積層體10’互相接觸之部分中,端銑刀50之旋轉方向(參照圖5中之符號50之部材內所描繪之箭號)與進給之方向(參照沿著圖5中之外周所描繪的箭號)為一致之關係性(又,將端銑刀50之旋轉方向與進給之方向為互相朝向相反之關係性稱為下銑(down-cut))。 In the cutting step, when cutting the inside of the recessed portion 2, the relationship between the direction of rotation of the end mill 50 and the direction of feed is set as up milling. The so-called up-milling refers to the part where the end mill 50 and the first laminated body 10' are in contact with each other, the direction of rotation of the end mill 50 (refer to the arrow depicted in the symbol 50 in FIG. 5) and the advance The given direction (refer to the arrow drawn along the outer circumference in Fig. 5) is a consistent relationship (also, the relationship that the rotation direction of the end mill 50 and the feed direction are opposite to each other is called down milling (down-cut)).

又,在切削步驟中切削凹部2內之角落2c時,使端銑刀50從相對於偏光片7之吸收軸方向呈垂直之方向進入而朝成為平行的方向移動。 In addition, when cutting the corner 2c in the recess 2 in the cutting step, the end mill 50 is moved in a direction perpendicular to the absorption axis direction of the polarizer 7 and moved in a parallel direction.

如圖5所示,吸收軸3為相對於朝向圖示上下方向之偏光片7,在凹部2內係以凹部2內作為端銑刀50之出發點,沿著第一積層體10’之外周而移動。如此一來,朝圖示左右方向進行移動時,朝向相對於偏光片7之吸收軸呈垂直之方向進行移動,而在角落2c中端銑刀50之行進彎曲而朝圖示上下方向進行移動時,朝向相對於偏光片7之吸收軸呈平行的方向進行移動。 As shown in FIG. 5, the absorption axis 3 is relative to the polarizer 7 facing the vertical direction as shown in the figure. In the concave portion 2, the inside of the concave portion 2 is used as the starting point of the end mill 50, and is formed along the outer circumference of the first laminate 10'. mobile. In this way, when moving in the left-right direction in the figure, it moves in a direction perpendicular to the absorption axis of the polarizer 7, and when the end mill 50 is bent in the corner 2c and moves in the vertical direction as shown in the figure. , Move in a direction parallel to the absorption axis of the polarizer 7.

藉由採用如此之切削方法,形成偏光片7之端部7e比保護膜5及光學膜9之各端部更朝內側凹陷之形狀。藉由調整端銑刀之旋轉速度(R)、進給速度(V)、及抵接次數(R/V),可調整偏光片7之端部7e的凹陷之程度。 By using such a cutting method, the end portion 7e of the polarizer 7 is formed into a shape that is more recessed toward the inner side than the end portions of the protective film 5 and the optical film 9. By adjusting the rotation speed (R), the feed speed (V), and the number of abutments (R/V) of the end mill, the degree of depression of the end 7e of the polarizer 7 can be adjusted.

藉由以上之方法,可獲得有關本實施型態之偏光板1。 By the above method, the polarizing plate 1 related to this embodiment can be obtained.

以上,說明有關本發明之適當的實施型態,但本發明並非受上述實施型態任何限定者。例如,在上述實施型態係表示一對之光學膜(5,9)之中之單側為由環烯烴系樹脂所構成的保護膜的態樣,但一對之光學膜(5,9)之兩者亦可為由環烯烴系樹脂所構成的保護膜。 Above, the appropriate embodiments of the present invention have been described, but the present invention is not limited by the above-mentioned embodiments in any way. For example, in the above embodiment, one side of a pair of optical films (5, 9) is a protective film made of cycloolefin resin, but a pair of optical films (5, 9) Both of them may be protective films composed of cycloolefin-based resins.

又,在上述實施型態係表示一對之光學膜(5,9)的端部之位置在側視於面內方向一致之態樣,但該端部彼此間係其位置在面內方向可在20μm以內偏移。如此,為一對之光學膜(5,9)之端部的位置在側視不一致之態樣時,各光學膜(5,9)之端部與偏光片7的端部7e之距離4w之中,長者之距離以15μm至56μm為較佳。 In addition, in the above-mentioned embodiment, the position of the ends of a pair of optical films (5, 9) is the same in the in-plane direction in side view, but the positions of the ends in the in-plane direction can be Offset within 20 μm. In this way, when the positions of the ends of a pair of optical films (5, 9) are inconsistent in side view, the distance between the end of each optical film (5, 9) and the end 7e of the polarizer 7 is 4w Among them, the distance for the elderly is preferably 15 μm to 56 μm .

又,在上述實施型態係表示在偏光板之俯視中在外周形成凹部之態樣,但如圖6所示,偏光板1A係可為在面內設有貫通孔2A之態樣取代凹部2。或者,可為設有凹部2與貫通孔2A之兩者的態樣,此時,對於構成貫通孔2A之側面,偏光片7之端部7e亦相對於一對之光學膜(5,9)而凹陷15μm至56μm。 In addition, in the above-mentioned embodiment, a concave portion is formed on the outer periphery of the polarizing plate in a plan view. However, as shown in FIG. 6, the polarizing plate 1A may be provided with a through hole 2A in the plane instead of the concave portion 2. . Alternatively, it may be a state in which both the concave portion 2 and the through hole 2A are provided. In this case, for the side surface constituting the through hole 2A, the end 7e of the polarizer 7 is also opposite to the pair of optical films (5, 9) The depression is 15 μm to 56 μm .

[實施例] [Example]

以下,舉出參考例、實施例、及比較例而更具體地說明本發明之內容。又,本發明係不受下述實施例所限定。 Hereinafter, reference examples, examples, and comparative examples are given to more specifically explain the content of the present invention. In addition, the present invention is not limited by the following examples.

<保護膜之破裂的研究> <Research on the rupture of protective film>

(參考例1) (Reference example 1)

將由環烯烴系樹脂所構成的長條狀的一對之保護膜隔著接著層而貼合於長條狀偏光片,並進一步藉由在保護膜上隔著感壓型接著劑層積層分離膜,形成第 一積層體。在第一積層體中,偏光片係配置於一對之保護膜之間。偏光片係經延伸、且經染色之膜狀聚乙烯醇。 A pair of long protective films made of cycloolefin resin are bonded to a long polarizer through an adhesive layer, and the separation film is further laminated by laminating a pressure-sensitive adhesive on the protective film , Forming the first A layered body. In the first laminate, the polarizer is arranged between the pair of protective films. The polarizer is stretched and dyed film-like polyvinyl alcohol.

貼合於偏光片之一表面的保護膜之厚度約為50μm。貼合於偏光片之另一表面的保護膜之厚度約為20μm。偏光片之厚度為8μm。偏光板整體之厚度約為100μm。中介於厚度約為50μm之保護膜與偏光片之間的接著層係聚乙烯醇系樹脂(水糊)。中介於厚度約為20μm之保護膜與偏光片之間的接著層係UV硬化性環氧樹脂。 The thickness of the protective film attached to one surface of the polarizer is about 50 μm . The thickness of the protective film attached to the other surface of the polarizer is about 20 μm . The thickness of the polarizer is 8 μm . The overall thickness of the polarizer is about 100 μm . The adhesive layer between the protective film and the polarizer with a thickness of about 50 μm is a polyvinyl alcohol-based resin (water paste). The adhesive layer between the protective film and the polarizer with a thickness of about 20 μm is UV curable epoxy resin.

接著,在約20μm之保護膜側表面,以感壓型接著劑層成為保護膜側之方式貼合感壓型接著劑層與分離膜之積層膜。在該積層膜中,分離膜係可剝離地貼附於感壓型接著劑層。 Next, on the protective film side surface of about 20 μm , the laminated film of the pressure sensitive adhesive layer and the separation film is bonded so that the pressure sensitive adhesive layer becomes the protective film side. In this laminated film, the separation film is releasably attached to the pressure-sensitive adhesive layer.

藉由47片之第一積層體各者的沖孔加工,在各第一積層體之短邊形成凹部。藉由使形成有凹部之47片第一積層體疊合,製作第二積層體。在此,如圖3所示,以偏光片之吸收軸朝向偏光板之長方向之方式沖孔。 By punching each of the 47 first laminates, recesses were formed on the short sides of each first laminate. The 47 first laminates in which the recesses were formed were stacked to produce the second laminate. Here, as shown in FIG. 3, the holes are punched so that the absorption axis of the polarizer faces the long direction of the polarizer.

於沖孔加工後,實施下述之切削步驟。將第二積層體以夾具固定,並在使端銑刀之側面接觸於第二積層體之外周(端面)之狀態下,將第二積層體之凹部內作為起始點,以上銑之方式使進行旋轉之端銑刀沿著外周移動。亦即,將47片之第一積層體各者的外周整體一次全部地以端銑刀切削。使用於各切削步驟之端銑刀係日進工具股份有限公司製之DXL-4。切削角度β為65度。端銑刀之直徑

Figure 109124276-A0202-12-0017-10
為4mm。 After punching, perform the following cutting steps. Fix the second laminated body with a jig, and with the side surface of the end mill in contact with the outer periphery (end surface) of the second laminated body, use the concave portion of the second laminated body as the starting point, and use the upper milling method. The rotating end mill moves along the outer circumference. That is, the entire outer periphery of each of the 47 first laminates was cut with an end mill all at once. The end mill used in each cutting step is DXL-4 manufactured by Nissin Tool Co., Ltd. The cutting angle β is 65 degrees. Diameter of end mill
Figure 109124276-A0202-12-0017-10
It is 4mm.

在切削步驟中之端銑刀的旋轉速度(R)、進給速度(V)、及、抵接次數(R/V)係下述表1所示之值。 The rotation speed (R), feed speed (V), and the number of abutments (R/V) of the end mill in the cutting step are the values shown in Table 1 below.

藉由以上之方法,製作47片之參考例的偏光板。各偏光板之形狀、尺寸及積層構造為相同。各偏光板之整體形狀為長方形。如圖1所示,四角形狀之凹部2形成於偏光板1之短邊。偏光板1之短邊的長度為70mm。偏光板1之長邊的長度為140mm。凹部2之寬度為30mm。凹部2之深度為5mm。 By the above method, 47 polarizing plates of the reference example were produced. The shape, size and layer structure of each polarizer are the same. The overall shape of each polarizer is rectangular. As shown in FIG. 1, a rectangular recess 2 is formed on the short side of the polarizing plate 1. The length of the short side of the polarizer 1 is 70 mm. The length of the long side of the polarizing plate 1 is 140 mm. The width of the recess 2 is 30 mm. The depth of the recess 2 is 5 mm.

在垂直於偏光板1之表面(受光面),且正交於凹部2之內側之方向,裁切偏光板1。以掃描型電子顯微鏡(SEM)觀察該偏光板1之剖面。使用SEM之觀察的結果,確認出沿著凹部2之偏光片7的端部7e係位置與一對之保護膜之端部一致(亦即,凹陷區域之寬度4w為0μm。) The polarizing plate 1 is cut in a direction perpendicular to the surface (light-receiving surface) of the polarizing plate 1 and perpendicular to the inner side of the recess 2. The cross section of the polarizing plate 1 was observed with a scanning electron microscope (SEM). As a result of observation using SEM, it was confirmed that the position of the end 7e of the polarizer 7 along the recessed portion 2 coincides with the end of the pair of protective films (that is, the width 4w of the recessed area is 0 μm .)

從各別之偏光板剝離分離膜,將經露出之感壓型接著劑層之面貼合於無鹼玻璃(取自CORNING公司之商品名“Eagle-XG”),在溫度50℃、壓力0.5MPa進行20分鐘之高壓鍋處理,使偏光板充分密著於無鹼玻璃。 The separation film was peeled off from the respective polarizing plates, and the exposed pressure-sensitive adhesive layer was pasted on an alkali-free glass (trade name "Eagle-XG" from CORNING) at a temperature of 50°C and a pressure of 0.5 MPa for 20 minutes of pressure cooker treatment, so that the polarizing plate is fully adhered to the alkali-free glass.

在經玻璃貼合之偏光板之凹部滴入油酸[取自和光純藥工業股份有限公司之1級試藥]。被覆覆蓋玻璃以免其油酸(溶劑)蒸發,以其狀態,直接放置3小時之後,卸下覆蓋玻璃而擦拭溶劑。 Drop oleic acid [taken from Wako Pure Chemical Industry Co., Ltd. grade 1 reagent] into the concave part of the polarizing plate laminated with glass. Cover the cover glass to prevent the oleic acid (solvent) from evaporating, and after leaving it in its state for 3 hours, remove the cover glass and wipe the solvent.

以下,進行熱循環試驗。在熱循環試驗係將由下述之步驟1,以及接續在步驟1之步驟2所構成的循環重複50次。 Hereinafter, a thermal cycle test is performed. In the thermal cycle test system, the cycle consisting of step 1 and step 2 following step 1 is repeated 50 times.

步驟1:將上述之偏光板於第一氛圍中保持30分鐘之步驟。 Step 1: The step of keeping the above-mentioned polarizing plate in the first atmosphere for 30 minutes.

步驟2:將上述之偏光板於第二氛圍中保持30分鐘之步驟。 Step 2: The step of keeping the above-mentioned polarizing plate in the second atmosphere for 30 minutes.

第一氛圍之溫度為-40℃,第一氛圍之相對濕度為11%。 The temperature of the first atmosphere is -40°C, and the relative humidity of the first atmosphere is 11%.

第二氛圍之溫度為85℃,第二氛圍之相對濕度為7%。 The temperature of the second atmosphere is 85°C, and the relative humidity of the second atmosphere is 7%.

熱循環試驗後,藉由沿著偏光板之凹部而以光學顯微鏡觀察偏光板之表面,計測在保護膜產生之破裂的數量與最大長度。破裂之數量、最大長度係表示於下述表1。 After the thermal cycle test, the surface of the polarizing plate was observed with an optical microscope along the concave portion of the polarizing plate, and the number and maximum length of the cracks generated in the protective film were measured. The number of ruptures and the maximum length are shown in Table 1 below.

(實施例1) (Example 1)

除了將端銑刀之旋轉速度(R)、進給速度(V)、及抵接次數(R/V)變更成如表1所示以外,其餘係與上述參考例同樣方式而製作偏光板。使用SEM之剖面觀察之結果,確認出沿著凹部之偏光片的端部位於偏光板之外周之內側。又,確認出一對之保護膜係互相不接觸,而偏光片之端部接觸外部空氣之狀態。凹陷區域之寬度為23μm。與上述參考例同樣方式而進行熱循環試驗。結果係表示於下述表1中。 Except that the rotation speed (R), the feed speed (V), and the number of contacts (R/V) of the end mill are changed as shown in Table 1, the polarizing plate was produced in the same manner as in the above reference example. As a result of cross-sectional observation using SEM, it was confirmed that the end of the polarizer along the recess was located inside the outer periphery of the polarizer. In addition, it was confirmed that the protective films of a pair were not in contact with each other, but the end of the polarizer was in contact with the outside air. The width of the recessed area is 23 μm . The thermal cycle test was performed in the same manner as in the reference example described above. The results are shown in Table 1 below.

(實施例2) (Example 2)

除了將端銑刀之旋轉速度(R)、進給速度(V)、及抵接次數(R/V)變更成如表1所示以外,其餘係與上述參考例同樣方式而製作偏光板。使用SEM之剖面觀察之結果,確認出沿著凹部之偏光片的端部位於偏光板之外周之內側。又,確認出一對之保護膜係互相不接觸,而偏光片之端部接觸外部空氣之狀態。凹陷區域之寬度為45μm。與上述參考例同樣方式而進行熱循環試驗。結果係表示於下述表1中。 Except that the rotation speed (R), the feed speed (V), and the number of contacts (R/V) of the end mill are changed as shown in Table 1, the polarizing plate was produced in the same manner as in the above reference example. As a result of cross-sectional observation using SEM, it was confirmed that the end of the polarizer along the recess was located inside the outer periphery of the polarizer. In addition, it was confirmed that the protective films of a pair were not in contact with each other, but the end of the polarizer was in contact with the outside air. The width of the recessed area is 45 μm . The thermal cycle test was performed in the same manner as in the reference example described above. The results are shown in Table 1 below.

(比較例1) (Comparative example 1)

除了將端銑刀之旋轉速度(R)、進給速度(V)、及抵接次數(R/V)變更成如表1所示以外,其餘係與上述參考例同樣方式而製作偏光板。使用SEM之剖面觀察之結果,確認出沿著凹部之偏光片的端部位於偏光板之外周之內側。又,確認出一對之保護膜係互相不接觸,而偏光片之端部接觸外部空氣之狀態。凹陷區域之 寬度為67μm。與上述參考例同樣方式而進行熱循環試驗。結果係表示於下述表1中。 Except that the rotation speed (R), the feed speed (V), and the number of contacts (R/V) of the end mill are changed as shown in Table 1, the polarizing plate was produced in the same manner as in the above reference example. As a result of cross-sectional observation using SEM, it was confirmed that the end of the polarizer along the recess was located inside the outer periphery of the polarizer. In addition, it was confirmed that the protective films of a pair were not in contact with each other, but the end of the polarizer was in contact with the outside air. The width of the recessed area is 67 μm . The thermal cycle test was performed in the same manner as in the reference example described above. The results are shown in Table 1 below.

[表1]

Figure 109124276-A0202-12-0020-1
[Table 1]
Figure 109124276-A0202-12-0020-1

凹陷區域之寬度為56μm以下之參考例1、實施例1、實施例2係在保護膜不產生破裂。凹陷區域之寬度超過56μm之比較例1係在保護膜產生破裂,其最大長度係超過1200μm之大者。 In Reference Example 1, Example 1, and Example 2 in which the width of the recessed area was 56 μm or less, the protective film did not crack. In Comparative Example 1 where the width of the recessed area exceeds 56 μm , the protective film is cracked, and the maximum length thereof exceeds 1200 μm .

<偏光片之破裂之研究> <Research on the rupture of polarizer>

(實施例3) (Example 3)

將與上述參考例同樣方式製作出之第二積層體以表2所示的條件切削。接著,在垂直於偏光板1之表面(受光面),且正交於凹部2之內側之方向,裁切偏光板1。以掃描型電子顯微鏡(SEM)觀察該偏光板1之剖面。 The second laminate produced in the same manner as in the above reference example was cut under the conditions shown in Table 2. Next, the polarizing plate 1 is cut in a direction perpendicular to the surface (light-receiving surface) of the polarizing plate 1 and perpendicular to the inner side of the recess 2. The cross section of the polarizing plate 1 was observed with a scanning electron microscope (SEM).

使用SEM觀察之結果,確認出沿著凹部2之偏光片7的端部7e位於偏光板1之外周1p之內側。又,確認出一對之保護膜係互相不接觸,而偏光片7之端部7e接觸外部空氣之狀態。凹陷區域之寬度為28μm。 As a result of observation using SEM, it was confirmed that the end 7e of the polarizer 7 along the concave portion 2 was located inside the outer periphery 1p of the polarizer 1. In addition, it was confirmed that the pair of protective films were not in contact with each other, but the end 7e of the polarizer 7 was in contact with the outside air. The width of the recessed area is 28 μm .

以下,進行結露熱循環試驗。在結露熱循環試驗係將由下述之步驟1、步驟1繼而之步驟2、及步驟2繼而之步驟3所構成的循環重複10次。 Hereinafter, a condensation heat cycle test is performed. In the condensation heat cycle test, the cycle consisting of the following step 1, step 1, then step 2, and step 2, then step 3, was repeated 10 times.

步驟1:將上述之偏光板於第一氛圍中保持30分鐘之步驟。 Step 1: The step of keeping the above-mentioned polarizing plate in the first atmosphere for 30 minutes.

步驟2:將上述之偏光板於第二氛圍中保持5分鐘之步驟。 Step 2: The step of keeping the above-mentioned polarizing plate in the second atmosphere for 5 minutes.

步驟3:將上述之偏光板於第三氛圍中保持30分鐘之步驟。 Step 3: The step of keeping the above-mentioned polarizing plate in the third atmosphere for 30 minutes.

第一氛圍之溫度為-40℃,第一氛圍之相對濕度為11%。 The temperature of the first atmosphere is -40°C, and the relative humidity of the first atmosphere is 11%.

第二氛圍之溫度為23℃,第二氛圍之相對濕度係為9%。 The temperature of the second atmosphere is 23°C, and the relative humidity of the second atmosphere is 9%.

第三氛圍之溫度為85℃,第三氛圍之相對濕度為7%。 The temperature of the third atmosphere is 85°C, and the relative humidity of the third atmosphere is 7%.

結露熱循環試驗後,藉由沿著偏光板之凹部而以光學顯微鏡觀察偏光板之表面,計測在偏光片產生之破裂之數與最大長度。破裂之數、最大長度係表示於下述表2。 After the condensation heat cycle test, observe the surface of the polarizer with an optical microscope along the concave portion of the polarizer, and measure the number of cracks and the maximum length of the polarizer. The number of ruptures and the maximum length are shown in Table 2 below.

(比較例2) (Comparative example 2)

除了將端銑刀之進給速度(V)、及抵接次數(R/V)變更成如表2所示以外,其餘係與上述實施例3同樣方式而製作偏光板。使用SEM之剖面觀察之結果,確認出沿著凹部之偏光片的端部位於偏光板之外周之內側。又,確認出一對之保護膜係互相不接觸,而偏光片之端部接觸外部空氣之狀態。凹陷區域之寬度為5μm。與上述參考例同樣方式而進行熱循環試驗。結果係表示於下述表2中。 Except that the feed speed (V) of the end mill and the number of contacts (R/V) were changed as shown in Table 2, the rest was the same as in the above-mentioned Example 3, and the polarizing plate was produced. As a result of cross-sectional observation using SEM, it was confirmed that the end of the polarizer along the recess was located inside the outer periphery of the polarizer. In addition, it was confirmed that the protective films of a pair were not in contact with each other, but the end of the polarizer was in contact with the outside air. The width of the recessed area is 5 μm . The thermal cycle test was performed in the same manner as in the reference example described above. The results are shown in Table 2 below.

(比較例3) (Comparative example 3)

除了將端銑刀之進給速度(V)、及抵接次數(R/V)變更成如表2所示以外,其餘係與上述實施例3同樣方式而製作偏光板。使用SEM之剖面觀察之結果,確認出沿著凹部之偏光片的端部位於偏光板之外周之內側。又,確認出一對之保護 膜係互相不接觸,而偏光片之端部接觸外部空氣之狀態。凹陷區域之寬度約略為0μm。與上述參考例同樣方式而進行熱循環試驗。結果係表示於下述表2中。 Except that the feed speed (V) of the end mill and the number of contacts (R/V) were changed as shown in Table 2, the rest was the same as in the above-mentioned Example 3, and the polarizing plate was produced. As a result of cross-sectional observation using SEM, it was confirmed that the end of the polarizer along the recess was located inside the outer periphery of the polarizer. In addition, it was confirmed that the protective films of a pair were not in contact with each other, but the end of the polarizer was in contact with the outside air. The width of the recessed area is approximately 0 μm . The thermal cycle test was performed in the same manner as in the reference example described above. The results are shown in Table 2 below.

[表2]

Figure 109124276-A0202-12-0022-2
[Table 2]
Figure 109124276-A0202-12-0022-2

如表2所示,凹陷區域之寬度為15μm以上時,產生之破裂的條數少,且其最大長度為1200μm以下之輕微者。凹陷區域之寬度為未達15μm時,產生之破裂之條數多,且其最大長度為超過1200μm之大者。 As shown in Table 2, when the width of the recessed area is 15 μm or more, the number of cracks generated is small, and the maximum length is slightly less than 1200 μm. When the width of the recessed area is less than 15 μm , the number of cracks generated is large, and the maximum length is greater than 1200 μm .

[產業上之利用可能性] [Industrial Utilization Possibility]

有關本發明之偏光板係例如,應用於液晶顯示器或有機EL顯示器等之圖像顯示裝置。 The polarizing plate related to the present invention is, for example, applied to image display devices such as liquid crystal displays or organic EL displays.

1:偏光板 1: Polarizing plate

1p:偏光板之外周 1p: The outer circumference of the polarizing plate

2:凹部 2: recess

2c:凹部之角落 2c: The corner of the recess

3:偏光片之吸收軸 3: The absorption axis of the polarizer

4:凹陷區域 4: Recessed area

4w:凹陷區域之寬度 4w: the width of the recessed area

5:第一光學膜 5: The first optical film

7:偏光片 7: Polarizer

7e:偏光片之端部 7e: The end of the polarizer

Claims (8)

一種偏光板,係具備膜狀之偏光片、及包含樹脂之至少一對之光學膜,其中, A polarizing plate is provided with a film-like polarizer and at least a pair of optical films containing resin, wherein: 前述偏光片係位於前述一對之光學膜之間,且與前述一對之光學膜重疊, The aforementioned polarizer is located between the aforementioned pair of optical films and overlaps with the aforementioned pair of optical films, 前述一對之光學膜之中,至少一方之光學膜為保護前述偏光片之保護膜, Among the aforementioned pair of optical films, at least one of the optical films is a protective film for protecting the aforementioned polarizer, 前述保護膜為由環烯烴系樹脂所構成, The aforementioned protective film is made of cycloolefin resin, 在俯視中,在外周設有凹部,或在面內設有貫通孔, In a plan view, a recess is provided on the outer circumference, or a through hole is provided in the surface, 在側視中,前述凹部內、或前述貫通孔內,前述偏光片之端部係比前述一對之光學膜之任一者的端部更靠內側15μm至56μm,且前述偏光片之端部係以接觸外部空氣之方式露出。 In a side view, in the recess or in the through hole, the end of the polarizer is 15 μm to 56 μm more inside than the end of any one of the pair of optical films, and the polarized light The end of the sheet is exposed by contacting the outside air. 如請求項1所述之偏光板,其中,前述偏光片係在經延伸之聚乙烯醇系樹脂膜吸附定向有二色性色素者。 The polarizing plate according to claim 1, wherein the polarizer is one having a dichroic dye adsorbed and oriented on the stretched polyvinyl alcohol-based resin film. 如請求項1或2所述之偏光板,前述偏光板在與具備前述保護膜之側為相反側之面更具備黏著劑層。 The polarizing plate according to claim 1 or 2, wherein the polarizing plate is further provided with an adhesive layer on the side opposite to the side provided with the protective film. 如請求項1至3中任一項所述之偏光板,其中,前述一對之光學膜係任一者皆為前述保護膜。 The polarizing plate according to any one of claims 1 to 3, wherein any one of the aforementioned pair of optical film systems is the aforementioned protective film. 如請求項1至4中任一項所述之偏光板,其中,在側視中,前述凹部內、或前述貫通孔內,前述一對之光學膜的端部彼此間之位置的差為20μm以內。 The polarizing plate according to any one of claims 1 to 4, wherein, in a side view, in the concave portion or in the through hole, the position difference between the ends of the pair of optical films is 20 Within μ m. 一種圖像顯示裝置,係包含請求項1至5中任一項所述之偏光板。 An image display device comprising the polarizing plate according to any one of claims 1 to 5. 一種偏光板之製造方法,係製造請求項1至5中任一項所述之偏光板,該製造方法具有切削步驟,該切削步驟係一面使旋轉切削工具接觸使膜狀之偏光片與至少一對之光學膜重疊而形成的積層體之側面,一面使前述旋轉切削工具沿著前述積層體之側面移動, A method for manufacturing a polarizing plate is to manufacture the polarizing plate according to any one of claims 1 to 5. The manufacturing method has a cutting step, and the cutting step involves contacting a rotary cutting tool with at least one side of the film-shaped polarizer. On the side surface of the laminated body formed by overlapping the optical films, the rotary cutting tool is moved along the side surface of the laminated body, 在俯視中,前述積層體係在外周設有凹部,或在面內設有貫通孔, In a plan view, the aforementioned laminated system is provided with recesses on the outer periphery, or with through holes in the surface, 前述一對之光學膜之中,至少一方之光學膜為保護前述偏光片之保護膜, Among the aforementioned pair of optical films, at least one of the optical films is a protective film for protecting the aforementioned polarizer, 前述保護膜係由環烯烴系樹脂所構成, The aforementioned protective film is composed of cycloolefin resin, 在前述切削步驟中,在前述凹部內、或前述貫通孔內進行切削時,將前述旋轉切削工具之旋轉速度設為20000至35000rpm,將進給速度設為0.42至0.60m/分鐘,且將前述旋轉切削工具之旋轉的方向與進給之方向之關係設為上銑,同時使前述旋轉切削工具從相對於前述偏光片之吸收軸方向呈垂直之方向進入而朝成為平行之方向移動。 In the foregoing cutting step, when cutting in the recess or the through hole, the rotation speed of the rotary cutting tool is set to 20000 to 35000 rpm, the feed rate is set to 0.42 to 0.60 m/min, and the foregoing The relationship between the direction of rotation of the rotary cutting tool and the direction of feed is set as up milling, and the rotary cutting tool is moved in a direction perpendicular to the direction of the absorption axis of the polarizer and moved in a parallel direction. 如請求項7所述之偏光板之製造方法,其中,將前述旋轉切削工具之旋轉速度設為25000至32000rpm,將進給速度設為0.45至0.50m/分鐘。 The method for manufacturing a polarizing plate according to claim 7, wherein the rotation speed of the rotary cutting tool is set to 25000 to 32000 rpm, and the feed rate is set to 0.45 to 0.50 m/min.
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