TWI666475B - Method for manufacturing sheet-like polarizing plate - Google Patents
Method for manufacturing sheet-like polarizing plate Download PDFInfo
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- TWI666475B TWI666475B TW104136293A TW104136293A TWI666475B TW I666475 B TWI666475 B TW I666475B TW 104136293 A TW104136293 A TW 104136293A TW 104136293 A TW104136293 A TW 104136293A TW I666475 B TWI666475 B TW I666475B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, 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
- G02B5/3041—Polarisers, 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
- G02B5/305—Polarisers, 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 including organic materials, e.g. polymeric layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, 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
- G02B5/3041—Polarisers, 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
- B32B2038/045—Slitting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
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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)
- Liquid Crystal (AREA)
Abstract
本發明提供一種偏光板片狀體的製造方法，係包含下述步驟：準備第1偏光板片狀體之步驟，該第1偏光板片狀體含有偏光片及積層在其至少一面上之保護薄膜且為具有長邊與短邊的方形形狀之偏光板片狀體，且在至少任意1個長邊中具有1個以上之波形缺陷；以及將第1偏光板片狀體中之包含具有波形缺陷之長邊的端部予以切開去除而得到第2偏光板片狀體之步驟。 The invention provides a method for manufacturing a polarizing plate sheet, which comprises the steps of preparing a first polarizing plate sheet, the first polarizing plate sheet including a polarizer and a protective layer on at least one side of the laminated sheet. The film is a rectangular polarizing plate sheet body having long sides and short sides, and has at least one waveform defect in at least any one of the long sides; and including the first polarizing plate sheet body with a waveform A step of cutting out and removing an end portion of the long side of the defect to obtain a second polarizing plate sheet body.
Description
本發明係有關一種適合在液晶顯示裝置等的影像顯示裝置中使用的波形缺陷減少的偏光板片狀體之製造方法。 The present invention relates to a method for manufacturing a polarizing plate sheet-like body with reduced waveform defects suitable for use in an image display device such as a liquid crystal display device.
液晶顯示裝置等的影像顯示裝置中使用的偏光板，一般是具有在偏光片的單面或兩面隔著接著劑層貼合保護薄膜之積層結構，使用長條狀的偏光片及長條狀的保護薄膜，藉由卷對卷的方式作成長條物(偏光板卷)而製造[例如日本特開2009-134190號公報(專利文獻1)]。得到的長條狀的偏光板，係對應影像顯示裝置的畫面尺寸而裁切成預定尺寸的片狀體，使用黏著劑層等而貼合積層在液晶單元(liquid crystal cell)等之影像顯示元件上，並在影像顯示裝置中組合。 A polarizing plate used in an image display device such as a liquid crystal display device generally has a laminated structure in which a protective film is laminated on one or both sides of a polarizer with an adhesive layer interposed therebetween, and a long polarizer and a long polarizer are used. The protective film is produced by forming a long strip (polarizing plate roll) by a roll-to-roll method [for example, Japanese Patent Application Laid-Open No. 2009-134190 (Patent Document 1)]. The obtained long polarizing plate is a sheet-shaped body cut into a predetermined size according to the screen size of an image display device, and an image display element such as a liquid crystal cell is laminated with an adhesive layer and the like And combine them in the image display device.
在專利文獻1中記載，作為用以抑制在偏光板中產生的所謂逆捲曲及波形捲曲之問題的方法者，係將長條狀的偏光片與長條狀之保護薄膜隔著接著劑重疊而得到積層體，然後，沿著此積層體的長邊方向在形成之圓弧 狀的凸曲面上一面密接該積層體，一面使接著劑聚合硬化。 Patent Document 1 describes that as a method for suppressing the problems of so-called reverse curl and wave curl generated in a polarizing plate, a long polarizer and a long protective film are overlapped with an adhesive therebetween. Obtain a laminated body, and then form an arc along the long side of the laminated body The laminated body is in close contact with the laminated body while the adhesive is polymerized and hardened.
(專利文獻) (Patent Literature)
[專利文獻1]日本特開2009-134190號公報 [Patent Document 1] Japanese Patent Laid-Open No. 2009-134190
根據專利文獻1中記載之方法，在剛製造至少長條狀的偏光板之後或是剛將此等裁切成片狀體之後，有可能抑制上述問題的發生。然而，經裁切成片狀體的偏光板(偏光板片狀體)，在初期即使沒有上述問題，但經由其保管環境，會有隨著吸濕而在保管中產生波形缺陷之情形。「波形缺陷」是指在偏光板片狀體的至少1邊及含有此等之端部區域起伏成波狀之變形缺陷。在偏光板片狀體中產生波形缺陷時，例如以液晶顯示裝置中適用的情形為例時，在隔著黏著劑層將偏光板片狀體與液晶單元貼合時，黏著劑層與液晶單元的貼合界面，特別是在貼合界面的端部區域及其附近容易混入氣泡。此氣泡如在液晶面板的影像顯示區域內產生時，在點亮時變成亮點而會降低液晶顯示裝置的能見度。 According to the method described in Patent Document 1, it is possible to suppress the occurrence of the above-mentioned problems immediately after manufacturing at least an elongated polarizing plate or immediately after cutting these into a sheet-like body. However, even if the polarizing plate (polarizing plate sheet) cut into a sheet-like body does not have the above-mentioned problems in the initial stage, the storage environment may cause waveform defects during storage due to moisture absorption. "Wave defect" means a deformation defect undulating in at least one side of a polarizing plate sheet body and an end region including the same. When a waveform defect occurs in a polarizing plate sheet, for example, in a case where it is applied to a liquid crystal display device, when the polarizing plate sheet is bonded to a liquid crystal cell via an adhesive layer, the adhesive layer and the liquid crystal cell are bonded together. It is easy to mix air bubbles in the bonding interface, especially in the end region of the bonding interface and its vicinity. When the bubbles are generated in the image display area of the liquid crystal panel, they become bright spots when they are turned on, which reduces the visibility of the liquid crystal display device.
在此本發明之目的係提供一種降低波形缺陷的個數或高度之偏光板片狀體的製造方法。 An object of the present invention is to provide a method for manufacturing a polarizing plate sheet-like body that reduces the number or height of wave defects.
本發明是提供以下所示之偏光板片狀體的製 造方法。 The present invention provides a manufacturing method of a polarizing plate sheet as shown below. 造 方法。 Manufacturing method.
[1]一種偏光板片狀體的製造方法，係包含下述步驟：準備第1偏光板片狀體之步驟，該第1偏光板片狀體係包含偏光片及積層在其至少一面上之保護薄膜且為具有長邊與短邊的方形形狀之偏光板片狀體，且在至少任意1個長邊中具有1個以上之波形缺陷；將上述第1偏光板片狀體中之包含具有上述波形缺陷之長邊的端部予以切開去除而得到第2偏光板片狀體之步驟。 [1] A method for manufacturing a polarizing plate sheet body, comprising the steps of preparing a first polarizing plate sheet body, the first polarizing plate sheet system including a polarizer and a laminate to protect at least one side thereof The film is a rectangular polarizing plate sheet body having long sides and short sides, and has more than one waveform defect in at least any one of the long sides; including the first polarizing plate sheet body having the above The end of the long side of the wave defect is cut and removed to obtain a second polarizing plate sheet.
[2]如[1]記載的製造方法，其中，在準備上述第1偏光板片狀體之步驟中，上述至少任意1個長邊中具有的波形缺陷為4個以上。 [2] The manufacturing method according to [1], wherein in the step of preparing the first polarizing plate sheet-like body, there are four or more wave defects in at least one of the long sides.
[3]如[1]或[2]記載的製造方法，其中，在準備上述第1偏光板片狀體的步驟中，上述至少任意1個的長邊具有的波形缺陷之高度是超過2mm。 [3] The manufacturing method according to [1] or [2], wherein in the step of preparing the first polarizing plate sheet-like body, a height of a wave defect having at least one of the long sides is more than 2 mm.
[4]如[1]至[3]中任一項記載的製造方法，其中，於得到上述第2偏光板片狀體之步驟中，將上述第1偏光板片狀體中包含具有上述波形缺陷之長邊端部以65mm以上的寬度予以切開去除。 [4] The manufacturing method according to any one of [1] to [3], wherein in the step of obtaining the second polarizing plate sheet body, the first polarizing plate sheet body includes the above-mentioned waveform The long-side end of the defect is cut and removed with a width of 65 mm or more.
[5]如[1]至[4]中任一項記載的製造方法，其中，上述 第1偏光板片狀體係包含：上述偏光片，隔著第1接著劑層積層在其一面上之第1保護薄膜，以及隔著第2接著劑層積層在另一面上之第2保護薄膜。 [5] The manufacturing method according to any one of [1] to [4], wherein The first polarizing plate sheet system includes the above-mentioned polarizer, a first protective film laminated on one side via a first adhesive layer, and a second protective film laminated on the other side via a second adhesive layer.
[6]如[5]記載的製造方法，其中，上述第1保護薄膜與上述第2保護薄膜，在溫度40℃、相對濕度90%的透濕度相差30g/(m2‧24hr)以上。 [6] The manufacturing method according to [5], wherein the first protective film and the second protective film have a difference of 30 g / (m 2 ‧ 24hr) or more in moisture permeability at a temperature of 40 ° C and a relative humidity of 90%.
[7]如[5]或[6]記載的製造方法，其中，上述第1接著劑層及上述第2接著劑層的至少任意一方，係由活性能量線硬化性接著劑的硬化物所構成。 [7] The manufacturing method according to [5] or [6], wherein at least one of the first adhesive layer and the second adhesive layer is composed of a cured product of an active energy ray-curable adhesive. .
[8]如[1]至[7]中任一項記載的製造方法，其中，上述第1偏光板片狀體更包含下述(a)及(b)：(a)積層在上述保護薄膜上之保護膜，(b)積層在上述偏光片上或上述保護薄膜上之黏著劑層，與積層在其外表面的分離薄膜。 [8] The manufacturing method according to any one of [1] to [7], wherein the first polarizing plate sheet further includes the following (a) and (b): (a) a laminated layer on the protective film The protective film is (b) an adhesive layer laminated on the polarizer or the protective film, and a separation film laminated on the outer surface thereof.
依據本發明，即可提供一種降低波形缺陷的個數或高度之偏光板片狀體。特別是，本發明可提供一種偏光板片狀體之製造方法，即使對進而產生波形缺陷而具有4個以上或其高度超過2mm之波形缺陷的偏光板片狀體，亦可使波形缺陷降低到充分足夠之程度。 According to the present invention, it is possible to provide a polarizing plate sheet-like body that reduces the number or height of wave defects. In particular, the present invention can provide a method for manufacturing a polarizing plate sheet body, which can reduce the waveform defect to a polarizing plate sheet body which further has wave defects and has 4 or more wave defects with a height exceeding 2 mm. Sufficient enough.
1‧‧‧第1偏光板片狀體 1‧‧‧ 1st polarizer sheet
10‧‧‧偏光片 10‧‧‧ Polaroid
20‧‧‧第1保護薄膜 20‧‧‧The first protective film
30‧‧‧第2保護薄膜 30‧‧‧Second protective film
40‧‧‧黏著劑層 40‧‧‧Adhesive layer
50‧‧‧分離薄膜 50‧‧‧ separation membrane
60‧‧‧保護膜 60‧‧‧ protective film
第1圖係表示第1偏光板片狀體的層構成之一例的概略剖面圖。 FIG. 1 is a schematic cross-sectional view showing an example of a layer configuration of a sheet body of a first polarizing plate.
本發明的偏光板片狀體之製造方法，係包含下述步驟：(1)準備第1偏光板片狀體之步驟，該第1偏光板片狀體為包含偏光片及積層在其至少一面上之保護薄膜且具有長邊與短邊之方形形狀的偏光板片狀體，且在至少任意1個長邊中有1個以上之波形缺陷，並且(2)將包含第1偏光板片狀體中具有上述波形缺陷之長邊的端部予以切開去除而得到第2偏光板片狀體之步驟。 The method for manufacturing a polarizing plate sheet according to the present invention includes the following steps: (1) preparing a first polarizing plate sheet, the first polarizing plate sheet includes a polarizer and a laminate on at least one side thereof; A polarizing plate sheet body with a protective film on it and having a rectangular shape with long sides and short sides, and having at least one waveform defect in at least any one of the long sides, and (2) including the first polarizing plate sheet A step of obtaining a second polarizing plate sheet body by cutting and removing an end portion of the long side having the wave defect in the body.
以下，對各步驟進行說明。 Each step will be described below.
(1)準備第1偏光板片狀體之步驟 (1) Steps for preparing sheet body of first polarizing plate
第1偏光板片狀體係波形缺陷之正在發生而容易伴隨著如上述般之氣泡的混入及隨此而有的能見度降低的問題之偏光板片狀體，具體而言，係在至少任意1個長邊中具有1個以上的波形缺陷之偏光板片狀體。第1偏光板片狀體進一步產生波形缺陷的結果，可為在至少任意1個的長邊中具有高度超過2mm之波形缺陷，或在至少任意1個的長邊中具有4個以上的波形缺陷之偏光板片狀體，第1偏光板片狀體在至少任意1個的長邊中具有4個以上之波形缺陷，並且，此等波形缺陷的任意1個以上為高度超過2mm 之波形缺陷。 The first polarizing plate sheet-like system is a polarizing plate-like body where wave defects are occurring and are easily accompanied by the inclusion of bubbles as described above and the problem of reduced visibility caused by them, specifically, at least one of them A polarizer sheet-like body having one or more wave defects on its long side. As a result of the first polarizing plate sheet body having further waveform defects, it may have a waveform defect having a height of more than 2 mm on at least one of the long sides, or four or more waveform defects on at least any one of the long sides. Polarizing plate sheet body, the first polarizing plate sheet body has 4 or more wave defects in at least any one long side, and any one or more of these wave defects has a height exceeding 2 mm Waveform defects.
波形缺陷的高度是指，將第1偏光板片狀體放置在平面台時，由平面台到波形缺陷頂部的高度，此時，第1偏光板片狀體，係將貼合在影像顯示元件(例如液晶單元(liquid crystal cell))側之面朝上而放置在平面台上。波形缺陷的高度是在第1偏光板片狀體的邊(端部)中測定。又，波形缺陷的個數，實質上是確認為波形缺陷之個數，具體而言，係將第1偏光板片狀體放置於平面台時，上述高度為自平面台算起有0.5mm以上之波形缺陷的個數。波形缺陷的個數亦是在第1偏光板片狀體的邊緣(端部)中測定。 The height of the waveform defect refers to the height from the flat surface to the top of the waveform defect when the first polarizing plate sheet is placed on a flat surface. At this time, the first polarizing plate sheet is attached to the image display element. (For example, a liquid crystal cell) is placed on a flat surface with the side facing up. The height of the wave defect is measured on the side (end portion) of the first polarizing plate sheet. In addition, the number of waveform defects is essentially the number of waveform defects confirmed. Specifically, when the first polarizing plate sheet is placed on a flat surface, the height is 0.5 mm or more from the flat surface. The number of waveform defects. The number of wave defects was also measured at the edge (end portion) of the first polarizing plate sheet.
第1偏光板片狀體是具有有長邊與短邊之方形形狀，為典型的長方形。長邊及短邊的長度雖無特別限制，但通常，第1偏光板片狀體的長邊是在700mm以上，短邊是在400mm以上。波形缺陷是第1偏光板片狀體的尺寸愈大，波形的高度或產生的個數則愈容易變得顯著。尺寸(長邊及/或短邊)過小時，波形缺陷的問題本身就不易產生。第1偏光板片狀體，係將製造成長條物的偏光板經裁切之後，在任意的條件下保管、運輸等的過程中，可以產生如上述般的波形缺陷之偏光板。 The first polarizing plate sheet has a rectangular shape having long sides and short sides, and is a typical rectangle. Although the length of the long side and the short side is not particularly limited, generally, the long side of the first polarizing plate sheet is 700 mm or more, and the short side is 400 mm or more. The waveform defect is that the larger the size of the first polarizing plate sheet body, the more easily the height of the waveform or the number of generated waveforms becomes noticeable. If the size (long side and / or short side) is too small, the problem of waveform defects itself is not easy to occur. The first polarizing plate sheet body is a polarizing plate that can produce waveform defects as described above after the polarizing plate for manufacturing a long strip is cut and stored or transported under any conditions.
一般，在任意1個長邊具有高度超過2mm的波形缺陷或4個以上的波形缺陷之第1偏光板片狀體，在該長邊對向的長邊亦有相同程度的波形缺陷者居多。又，在任意1個長邊具有高度超過2mm的波形缺陷或4個以上的波形缺陷之第1偏光板片狀體，在2個短邊亦有波形缺 陷者居多。但是，在2個短邊產生的波形缺陷，於此高度及/或個數中，相較於長邊產生的波形缺陷有較小的傾向，又，在短邊中的波形缺陷，相較於長邊的波形缺陷則有不易產生氣泡混入的問題之傾向。於是，為了抑制氣泡混入及隨此之能見度降低的問題，不得不特別降低在長邊產生的波形缺陷。 Generally, the first polarizing plate sheet body having a waveform defect having a height exceeding 2 mm on any one long side or four or more waveform defects has the same degree of waveform defect on the long side opposite to the long side. In addition, the first polarizing plate sheet body having a waveform defect having a height exceeding 2 mm on any one long side or a waveform defect having four or more waveform defects also had a waveform defect on two short sides. Most are trapped. However, the waveform defects generated on the two short sides have a smaller tendency than the waveform defects generated on the long side in this height and / or the number of waveform defects. The long-side wave defect tends to be less prone to air bubbles. Therefore, in order to suppress the problems of air bubble mixing and the decrease in visibility caused by this, it is necessary to particularly reduce the waveform defect generated on the long side.
第1偏光板片狀體的層構成，只要包含偏光片與在此至少一面上所積層貼合之保護薄膜者，則無特別限制，可在偏光片的兩面積層貼合保護薄膜。保護薄膜通常是在偏光片上隔著接著劑層而積層貼合。 The layer structure of the first polarizer sheet-like body is not particularly limited as long as it includes a polarizer and a protective film laminated on at least one side thereof, and a protective film may be laminated on both areas of the polarizer. The protective film is usually laminated and bonded on a polarizer via an adhesive layer.
第1偏光板片狀體，亦可具有偏光片及保護薄膜之外的層(或薄膜)。例如，一般，製造成長條物的偏光板及將此裁切而成的偏光板片狀體係將用以貼合在影像顯示元件(例如液晶單元)的黏著劑層，作成預先積層在偏光板外表面之附有黏著劑層的偏光板，雖很多也在市場上流通，但可包含第1偏光板片狀體，或如此之黏著劑層。含有黏著劑層時，通常是以用以保護其表面(外表面)的分離薄膜(分離片)積層在黏著劑層之外表面。 The first polarizer sheet-like body may have a layer (or film) other than the polarizer and the protective film. For example, in general, a polarizing plate that is made of long strips and a sheet-like system made of the cut polarizing plate will be used to adhere to an adhesive layer of an image display element (such as a liquid crystal cell) to be laminated in advance on the polarizing plate. Although many polarizing plates with an adhesive layer on the surface are also circulated on the market, they may include a first polarizing plate sheet or such an adhesive layer. When the adhesive layer is contained, a separation film (separation sheet) for protecting the surface (outer surface) is usually laminated on the outer surface of the adhesive layer.
又，製造成長條物的偏光板，通常是將其捲繞作為偏光板卷而保管或流通，惟在捲繞時，為了保護外側的保護薄膜表面，一般是在該保護薄膜上預先設置有保護膜(表面保護薄膜)，此情形，該偏光板裁切成偏光板片狀體一般亦同時具有保護膜。如此情形般，第1偏光板片狀體可為包含保護薄膜上積層有保護膜者。 In addition, a polarizing plate for manufacturing a long strip is usually wound and stored as a polarizing plate roll, but during the winding, in order to protect the outer surface of the protective film, a protective film is generally provided in advance on the protective film. Film (surface protection film). In this case, the polarizing plate is cut into a polarizing plate sheet and generally has a protective film at the same time. In this case, the first polarizing plate sheet may include a protective film laminated on the protective film.
進一步，第1偏光板片狀體所具有的保護薄膜，可為在其外表面(與偏光片為相反側的面)具備如硬塗層、防眩層、抗反射層、抗靜電層、防污層的表面處理層(塗布層)者。又，第1偏光板片狀體可包含偏光片之外的其它具有光學機能之層或薄膜。此之一例是相位差薄膜。 Furthermore, the protective film of the first polarizing plate sheet body may be provided with, for example, a hard coat layer, an anti-glare layer, an anti-reflection layer, an anti-static layer, an anti- Surface treatment layer (coating layer) of the stain layer. In addition, the first polarizing plate sheet body may include a layer or film having optical functions other than the polarizing plate. An example of this is a retardation film.
第1偏光板片狀體的層構成之一例呈示於第1圖。第1圖所示之第1偏光板片狀體1係包含：偏光片10；貼合在偏光片10的一面之第1保護薄膜20；貼合在偏光片10的另一面之第2保護薄膜30；積層在第2保護薄膜30的外表面之黏著劑層40；積層在黏著劑層40的外表面之分離薄膜50；積層在第1保護薄膜20的外表面之保護膜60。除了偏光片10及保護薄膜(第1保護薄膜20、第2保護薄膜30)之外，具有黏著劑層40與分離薄膜50之層構成、具有保護膜60之層構成，或是具有黏著劑層40、分離薄膜50及保護膜60之層構成，係第1偏光板片狀體的較佳層構成之例。黏著劑層40，如後述般，係將第1保護薄膜20及第2保護薄膜30的任一方省略，而可在偏光片10之上直接積層。 An example of the layer configuration of the first polarizing plate sheet is shown in FIG. 1. The first polarizing plate sheet 1 shown in FIG. 1 includes: a polarizer 10; a first protective film 20 attached to one side of the polarizer 10; and a second protective film attached to the other side of the polarizer 10 30; an adhesive layer 40 laminated on the outer surface of the second protective film 30; a separation film 50 laminated on the outer surface of the adhesive layer 40; a protective film 60 laminated on the outer surface of the first protective film 20. In addition to the polarizer 10 and the protective film (the first protective film 20 and the second protective film 30), it has a layer structure of an adhesive layer 40 and a separation film 50, a layer structure of a protection film 60, or an adhesive layer 40. The layer structure of the separation film 50 and the protective film 60 is an example of a preferable layer structure of the first polarizing plate sheet. As described later, the adhesive layer 40 can omit either of the first protective film 20 and the second protective film 30 and can be directly laminated on the polarizer 10.
偏光片10，係具有吸收持有與光學軸平行之振動面的直線偏光，透過持有與光學軸正交之振動面的直線偏光性質之光學薄膜，例如，可以是單軸延伸、二色性色素經吸附定向的聚乙烯醇系樹脂薄膜。作為二色性色素者，係使用碘或二色性有機染料。構成偏光片10之聚乙烯醇系樹脂，除了聚醋酸乙烯的皂化物之聚乙烯醇之外，可 為可與醋酸乙烯酯與其共聚合的其它單體(例如乙烯或不飽和羧酸等)之共聚合物的皂化物之乙烯醇系共聚合物。偏光片10的厚度，通常是5至40μm左右。 The polarizing film 10 is an optical film having linearly polarized light that absorbs and holds a vibration plane parallel to the optical axis and transmits linearly polarized light that has a vibration plane that is orthogonal to the optical axis. For example, it may be uniaxially stretched or dichroic. A polyvinyl alcohol-based resin film in which a pigment is oriented by adsorption. As the dichroic pigment, iodine or a dichroic organic dye is used. The polyvinyl alcohol-based resin constituting the polarizer 10 may be other than polyvinyl alcohol, which is a saponified product of polyvinyl acetate. A vinyl alcohol-based copolymer which is a saponified product of a copolymer of vinyl acetate and other monomers (e.g., ethylene or unsaturated carboxylic acid). The thickness of the polarizer 10 is usually about 5 to 40 μm.
偏光片10，可藉由包含下述步驟之方法進行。該等步驟係：將聚乙烯醇系樹脂薄膜進行單軸延伸之步驟、將聚乙烯醇系樹脂薄膜以二色性色素染色而吸附該二色性色素之步驟、將經吸附有二色性色素的聚乙烯醇系樹脂薄膜以硼酸水溶液進行處理之步驟，及藉由硼酸水溶液處理後進行水洗步驟的方法。二色性色素的染色係可藉由在含有二色性色素之水溶液中浸漬薄膜，藉由硼酸水溶液之處理係可藉由在硼酸水溶液中浸漬薄膜而進行。 The polarizer 10 can be performed by a method including the following steps. These steps are: a step of uniaxially stretching the polyvinyl alcohol resin film, a step of dyeing the polyvinyl alcohol resin film with a dichroic pigment to adsorb the dichroic pigment, and adsorbing the dichroic pigment A step of treating a polyvinyl alcohol-based resin film with a boric acid aqueous solution, and a method of performing a water washing step after treatment with a boric acid aqueous solution. Dyeing of a dichroic dye can be performed by immersing a film in an aqueous solution containing a dichroic dye, and treatment with an aqueous solution of boric acid can be performed by immersing the film in an aqueous solution of boric acid.
聚乙烯醇系樹脂薄膜的單軸延伸，可在二色性色素的染色前、與染色之同時，或是在染色之後進行。單軸延伸在染色之後進行時，此單軸延伸可在硼酸處理之前或是硼酸處理中進行。又，亦可在此等的複數階段中進行單軸延伸。 The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after dyeing the dichroic pigment. When the uniaxial extension is performed after dyeing, the uniaxial extension may be performed before or during the boric acid treatment. It is also possible to perform uniaxial stretching in these plural stages.
第1及第2保護薄膜20、30，可為具有透光性的(理想的是光學透明之)熱塑性樹脂薄膜。熱塑性樹脂的具體例，含有：如鏈狀聚烯烴系樹脂(聚丙烯系樹脂等)、環狀聚烯烴系樹脂(降莰烯系樹脂等)的聚烯烴系樹脂；聚酯系樹脂(聚對苯二甲酸乙二酯系樹脂等)；(甲基)丙烯酸系樹脂(甲基丙烯酸甲酯系樹脂等)；纖維素系樹脂(如三乙醯纖維素[TAC]、二乙醯纖維素的醋酸纖維素系樹脂等)；聚碳酸酯系樹脂；聚乙烯醇系樹脂；聚醋酸乙烯酯系樹脂； 聚芳酯系樹脂；聚苯乙烯系樹脂；聚醚碸系樹脂；聚碸系樹脂；聚醯胺系樹脂；聚亞醯胺系樹脂；及此等的混合物、共聚合物。第1及第2保護薄膜20、30的厚度，例如是5至200μm左右，以10至150μm為佳，以15至100μm更佳。在本說明書中之「(甲基)丙烯酸」是指選自丙烯酸及甲基丙烯酸中至少一者的意思。 The first and second protective films 20 and 30 may be transparent (preferably optically transparent) thermoplastic resin films. Specific examples of the thermoplastic resin include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.); polyester resins (polyesters) (Ethylene phthalate resins, etc.); (meth) acrylic resins (methyl methacrylate resins, etc.); cellulose resins (such as triethyl cellulose [TAC], Cellulose acetate resin, etc.); polycarbonate resin; polyvinyl alcohol resin; polyvinyl acetate resin; Polyarylate resin; polystyrene resin; polyether fluorene resin; polyfluorene resin; polyamine resin; polyimide resin; and mixtures and copolymers thereof. The thickness of the first and second protective films 20 and 30 is, for example, about 5 to 200 μm, preferably 10 to 150 μm, and more preferably 15 to 100 μm. In the present specification, "(meth) acrylic acid" means the meaning of at least one selected from acrylic acid and methacrylic acid.
如第1圖中所示的第1偏光板片狀體1，在偏光片10的一面上具備第1保護薄膜20，在另一面上具備第2保護薄膜30時，第1保護薄膜20與第2保護薄膜30，可以相同種類的熱塑性樹脂構成，亦可用不同種類的熱塑性樹脂構成，但以不同種類的熱塑性樹脂構成時等，貼合在兩面之保護薄膜的透濕度互為不同時，因吸濕性的不同而特別容易發生波形缺陷，故在如此的情形下本發明是特別有利。根據本發明，即使貼合在兩面的保護薄膜之透濕度差是在30g/(m2‧24hr)以上，進一步為50g/(m2‧24hr)以上，甚至為100g/(m2‧24hr)以上，特別是在300g/(m2‧24hr)以上時，亦可得到波形缺陷降低，難以發生氣泡混入及伴隨此之能見度降低的問題之偏光板片狀體。通常，貼合在兩面貼合之保護薄膜的透濕度差是在900g/(m2‧24hr)以下。 When the first polarizing plate sheet-like body 1 shown in FIG. 1 is provided with a first protective film 20 on one side of the polarizer 10 and a second protective film 30 on the other side, the first protective film 20 and the first 2 The protective film 30 may be made of the same type of thermoplastic resin or different types of thermoplastic resin, but when it is made of different types of thermoplastic resin, etc., when the moisture permeability of the protective film attached to both sides is different from each other, The difference in wetness is particularly prone to waveform defects, so the present invention is particularly advantageous in such cases. According to the present invention, even if the moisture permeability difference of the protective film laminated on both sides is 30 g / (m 2 ‧24hr) or more, further 50 g / (m 2 ‧24hr) or more, or even 100 g / (m 2 ‧24hr) Above, especially at 300 g / (m 2 ‧24hr) or more, a polarizing plate-like body with reduced waveform defects and difficulty in mixing air bubbles and accompanying problems of reduced visibility can also be obtained. Generally, the moisture permeability difference of the protective film laminated on both sides is less than 900g / (m 2 ‧24hr).
上述透濕度係在溫度40℃、相對濕度90%的透濕度，係依JIS Z 0208所規定的藉由杯法來測定。作為在溫度40℃、相對濕度90%的透濕度差為30g/(m2‧24hr)以上之保護薄膜的組合者，可列舉例如：纖維素系樹脂薄膜 (TAC薄膜等)與環狀聚烯烴系樹脂的組合、纖維素系樹脂薄膜(TAC薄膜等)與(甲基)丙烯酸系樹脂薄膜的組合、環狀聚烯烴系樹脂與(甲基)丙烯酸系樹脂薄膜的組合等。又，即使構成貼合在兩面的保護薄膜之熱塑性樹脂為相同種類者，但由於在此之上所積層的表面處理層之有無或種類的不同，而會產生透濕度差。 The moisture permeability is a moisture permeability at a temperature of 40 ° C and a relative humidity of 90%, and is measured by a cup method in accordance with JIS Z 0208. Examples of a combination of protective films having a moisture permeability difference of 30 g / (m 2 ‧24hr) or higher at a temperature of 40 ° C and a relative humidity of 90% include, for example, cellulose resin films (TAC films) and cyclic polyolefins. A combination of resins, a combination of cellulose resin films (TAC films, etc.) and (meth) acrylic resin films, a combination of cyclic polyolefin resins and (meth) acrylic resin films, and the like. In addition, even if the thermoplastic resin constituting the protective film bonded on both sides is the same type, there is a difference in moisture permeability due to the presence or absence or type of the surface treatment layer laminated thereon.
偏光片10，與第1保護薄膜20及第2保護薄膜30，係可隔著接著劑層而貼合。作為形成接著劑層的接著劑者，係可使用水系接著劑，亦即，可使用接著劑成分溶解在水中者，或在水中分散者，或是活性能量線硬化性接著劑。 The polarizer 10 and the first protective film 20 and the second protective film 30 can be bonded together via an adhesive layer. As the adhesive for forming the adhesive layer, an aqueous adhesive can be used, that is, an adhesive whose components are dissolved in water or dispersed in water, or an active energy ray-curable adhesive can be used.
水系接著劑的接著劑成分，例如可為聚乙烯醇系樹脂或胺甲酸乙酯樹脂。活性能量線硬化性接著劑，例如，可為包含環氧系化合物或(甲基)丙烯酸系化合物等的活性能量線硬化性化合物，與聚合起始劑之硬化性組成物。活性能量線硬化性接著劑可為是無溶劑型的接著劑，惟亦可包含有機溶劑。若使用無溶劑型的接著劑，即無須用以去除溶劑的乾燥處理。使用活性能量線硬化性接著劑時，隔著接著劑層而貼合保護薄膜之後，照射可見光、紫外光、X射線、電子束等的活性能量線，理想的是照射紫外光而使接著劑層硬化。於是，此情形，在第1偏光板片狀體的接著劑層係包含活性能量線硬化性接著劑的硬化物。 The adhesive component of the water-based adhesive may be, for example, a polyvinyl alcohol resin or a urethane resin. The active energy ray-curable adhesive may be, for example, a curable composition containing an active energy ray-curable compound such as an epoxy-based compound or a (meth) acrylic compound and a polymerization initiator. The active energy ray-curable adhesive may be a solventless adhesive, but may also include an organic solvent. If a solventless adhesive is used, a drying process for removing the solvent is not necessary. When using an active energy ray-curable adhesive, after bonding the protective film through the adhesive layer, it is irradiated with active energy rays such as visible light, ultraviolet light, X-rays, and electron beams. Ideally, the adhesive layer is irradiated with ultraviolet light. hardening. In this case, the adhesive layer of the first polarizing plate sheet includes a cured product of an active energy ray-curable adhesive.
如第1圖所示之第1偏光板片狀體1，在偏 光片10的一面上具備第1保護薄膜20，在另一面上具備第2保護薄膜30時，貼合第1保護薄膜20之第1接著劑層與貼合第2保護薄膜30之第2接著劑層，可由相同種類的接著劑而形成，亦可由不同種類的接著劑而形成，但從製造效率的觀點而言，理想的是由相同種類的接著劑而形成。 The first polarizing plate sheet 1 shown in FIG. When the first protective film 20 is provided on one side of the light sheet 10 and the second protective film 30 is provided on the other side, the first adhesive layer of the first protective film 20 is bonded to the second adhesive layer of the second protective film 30 The adhesive layer may be formed of the same type of adhesive, or may be formed of different types of adhesives. However, from the viewpoint of manufacturing efficiency, it is desirable to form the adhesive layer of the same type.
在第1接著劑層及第2接著劑層的至少任一方(理想的是雙方)包含活性能量線硬化性接著劑的硬化物時，由於特別容易發生因吸濕所致的波形缺陷，故在如此之情形中本發明是特別有利。 When at least one (preferably both) of the first adhesive layer and the second adhesive layer contains a cured product of the active energy ray-curable adhesive, the waveform defects due to moisture absorption are particularly prone to occur. The invention is particularly advantageous in such cases.
作為構成用以貼合影像顯示元件(例如液晶單元)之黏著劑層40之黏著劑者，例如，可列舉：(甲基)丙烯酸系黏著劑、胺甲酸乙酯系黏著劑、矽氧系黏著劑、聚酯系黏著劑、聚醯胺系黏著劑、聚醚系黏著劑、含氟系黏著劑、橡膠系黏著劑等。其中，從透明性、黏著力、可信度、再加工性等的觀點而言，以使用(甲基)丙烯酸系黏著劑為理想。黏著劑層40的厚度，通常是2至40μm。 Examples of the adhesive constituting the adhesive layer 40 for adhering an image display element (such as a liquid crystal cell) include, for example, a (meth) acrylic adhesive, a urethane adhesive, and a silicone adhesive. Agents, polyester-based adhesives, polyamide-based adhesives, polyether-based adhesives, fluorine-based adhesives, rubber-based adhesives, and the like. Among these, it is preferable to use a (meth) acrylic-type adhesive from a viewpoint of transparency, adhesive force, reliability, reworkability, etc. The thickness of the adhesive layer 40 is usually 2 to 40 μm.
分離薄膜50及保護膜60，分別是在將偏光板進行保管/運搬，或是檢査之時，用以暫時保護黏著劑層40、第1保護薄膜20之目的而設置者。保護黏著劑層40之分離薄膜50，實際上是供後述之第2偏光板片狀體使用(例如，在如液晶單元的影像顯示元件中貼合)後立即被剝離去除。又，保護膜60，通常是供第2偏光板片狀體使用(例如，在如液晶單元的影像顯示元件中貼合)之後，依其 黏著劑層而被剝離去除。 The separation film 50 and the protective film 60 are respectively provided for the purpose of temporarily protecting the adhesive layer 40 and the first protective film 20 during storage, transportation, or inspection of the polarizing plate. The separation film 50 that protects the adhesive layer 40 is actually used for a second polarizing plate sheet described later (for example, bonding to an image display element such as a liquid crystal cell) and immediately removed. In addition, the protective film 60 is usually used for the second polarizing plate sheet (for example, bonded to an image display element such as a liquid crystal cell), and then The adhesive layer was peeled and removed.
分離薄膜50，通常是以單面經實施脫模處理之熱塑性樹脂薄膜所構成，而該脫模處理面是貼合在黏著劑層40上。又，保護膜60，通常是在熱塑性樹脂薄膜的單面設置黏著劑層而構成。構成分離薄膜50及保護膜60之熱塑性樹脂，例如可為如聚乙烯的聚乙烯系樹脂、如聚丙烯的聚丙烯系樹脂、如聚對苯二甲酸乙二酯及聚萘二甲酸乙二酯的聚酯系樹脂等。關於保護膜60所含之黏著劑層，係引用上述黏著劑層40的相關記述。 The release film 50 is generally composed of a thermoplastic resin film subjected to a release treatment on one side, and the release treatment surface is bonded to the adhesive layer 40. The protective film 60 is generally formed by providing an adhesive layer on one side of a thermoplastic resin film. The thermoplastic resin constituting the separation film 50 and the protective film 60 may be, for example, a polyethylene-based resin such as polyethylene, a polypropylene-based resin such as polypropylene, such as polyethylene terephthalate, and polyethylene naphthalate. Polyester resin. Regarding the adhesive layer contained in the protective film 60, the relevant description of the above-mentioned adhesive layer 40 is cited.
第1偏光板片狀體的層構成並不限定第1圖中所示之例者，例如亦可為如下述的層構成。 The layer structure of the first polarizing plate sheet is not limited to the example shown in the first figure, and may be, for example, the following layer structure.
[a]省略黏著劑層40、分離薄膜50及保護膜60的任意1個以上之構成，[b]省略第1保護薄膜20及第2保護薄膜30的任意一方之構成，[c]使用作為第2保護薄膜30之如相位差薄膜的光學補償薄膜之構成，[d]除了第1保護薄膜20及第2保護薄膜30之外，具有如相位差薄膜的光學補償薄膜之構成。 [a] omitting any one or more of the adhesive layer 40, the separation film 50, and the protective film 60, [b] omitting either of the first protective film 20 and the second protective film 30, [c] used as [D] In addition to the first protective film 20 and the second protective film 30, the second protective film 30 has a configuration of an optical compensation film such as a retardation film.
上述[b]的一個例子是省略第2保護薄膜30之構成，期較佳具體例係在偏光片10中與第1保護薄膜20為相反側的面上直接積層黏著劑層40，作成保護膜60/第1保護薄膜20/偏光片10/黏著劑層40/分離薄膜 50的層構成者。 An example of the above [b] is to omit the structure of the second protective film 30. A preferred specific example is to directly laminate the adhesive layer 40 on the surface of the polarizer 10 opposite to the first protective film 20 to form a protective film. 60 / first protective film 20 / polarizer 10 / adhesive layer 40 / separation film 50-story constructor.
上述[c]的較佳具體例，係作成保護膜60/第1保護薄膜20/偏光片10/相位差薄膜(第2保護薄膜30)/黏著劑層40/分離薄膜50的層構成者。上述[d]的較佳具體例，係作成保護膜60/第1保護薄膜20/偏光片10/第2保護薄膜30/相位差薄膜/黏著劑層40/分離薄膜50的層構成者。此情形，第2保護薄膜30與相位差薄膜例如可隔著黏著劑層而貼合。 The preferred specific examples of the above [c] are those in which the protective film 60 / the first protective film 20 / the polarizer 10 / the retardation film (the second protective film 30) / the adhesive layer 40 / the separation film 50 are formed. The preferred specific examples of the above [d] are those in which the protective film 60 / the first protective film 20 / the polarizer 10 / the second protective film 30 / the retardation film / the adhesive layer 40 / the separation film 50 are formed. In this case, the second protective film 30 and the retardation film can be bonded together, for example, via an adhesive layer.
相位差薄膜係具有單軸或二軸等的光學各向異性的光學薄膜，例如可為熱塑性樹脂的延伸薄膜。熱塑性樹脂，除了可為有關第1及第2保護薄膜20、30的上述所例示者之外，亦可使用聚偏二氟乙烯/聚甲基丙烯酸甲酯共聚合體、液晶聚酯、乙醯纖維素、乙烯-醋酸乙烯酯共聚合體的皂化物、聚氯乙烯等。延伸倍率通常是1.01至6倍左右。 The retardation film is an optical film having optical anisotropy such as uniaxial or biaxial, and may be, for example, a stretched film of a thermoplastic resin. In addition to the thermoplastic resins described above with respect to the first and second protective films 20 and 30, polyvinylidene fluoride / polymethyl methacrylate copolymers, liquid crystal polyester, and ethyl acetate fibers can also be used. Element, saponified product of ethylene-vinyl acetate copolymer, polyvinyl chloride and the like. The stretching ratio is usually about 1.01 to 6 times.
(2)得到第2偏光板片狀體之步驟 (2) Step of obtaining second polarizing plate sheet
本步驟，係將在至少任意1個的長邊中有1個以上的波形缺陷之第1偏光板片狀體之長邊端部(包含具有該波形缺陷之長邊的端部)予以切開去除，而得到該波形缺陷經降低之第2偏光板片狀體之步驟。在切開時，係可以使用剪切刀(shear cutter)等之以往周知的裁切(切斷)手段。 In this step, the long-side end (including the end with the long side having the wave defect) of the first polarizing plate sheet body having at least one wave defect in at least one of the long sides is cut and removed. , And a step of obtaining the second polarizing plate sheet body with reduced waveform defects. For cutting, a conventionally known cutting (cutting) means such as a shear cutter can be used.
第1偏光板片狀體含有積層在保護薄膜上之保護膜60，及/或在偏光片10或保護薄膜上所積層之黏 著劑層40與在其外表面積層之分離薄膜50時，在端部(特別是上述長邊端部)產生波形缺陷的第1偏光板片狀體中，該端部的色調變黑而伴隨著有外觀不良之現象。此外觀不良應該是因發生波形缺陷時的應力而在構成保護膜60之熱塑性樹脂薄膜與黏著劑層的界面，或是分離薄膜50與黏著劑層40的界面中發生位移而使黏著劑層表面粗糙的原因所致。尤其是在黏著劑層40的表面產生粗糙時，如液晶單元的影像顯示元件中貼合之後，恐怕也會殘留不良的外觀。 The first polarizing plate sheet body includes a protective film 60 laminated on the protective film, and / or an adhesive layer laminated on the polarizer 10 or the protective film. When the adhesive layer 40 and the separation film 50 on the outer surface area layer of the first polarizing plate sheet body having wave defects at an end portion (especially the long-side end portion), the color tone of the end portion is accompanied by blackening. There is a phenomenon of poor appearance. In addition, the poor appearance should be caused by the displacement of the thermoplastic resin film and the adhesive layer constituting the protective film 60 or the interface between the separation film 50 and the adhesive layer 40 due to the stress at the time of the waveform defect. Rough cause. In particular, when the surface of the adhesive layer 40 is rough, for example, after bonding to an image display element of a liquid crystal cell, a poor appearance may remain.
藉由本步驟，若試圖去除上述外觀不良部分而進行切開去除的話，也可以得到在色調的面上有良好品質的外觀之偏光板片狀體。 With this step, if an attempt is made to remove the above-mentioned defective appearance and cut and removed, a polarizing plate-like body having a good-quality appearance on the surface of the hue can also be obtained.
切開去除，係在具有上述波形缺陷之長邊端部進行。特別是，在任意1個長邊中具有高度超過2mm之波形缺陷或是4個以上的波形缺陷的第1偏光板片狀體中，很多是在該長邊對面之長邊中也有相同程度的波形缺陷，典型上，係針對兩方的長邊端部進行切開去除。 Incision and removal are performed at the long-side end portion having the above-mentioned waveform defect. In particular, in any one of the first polarizing plate sheets having a waveform defect having a height of more than 2 mm in any one of the long sides or four or more waveform defects, many of them have the same degree in the long side opposite to the long side. Wave defects are typically cut and removed at the two long side ends.
關於經切開去除的長邊端部之寬W1，在至少任意1個的長邊中具有高度超過2mm之波形缺陷或是4個以上的波形缺陷之偏光板片狀體的情形，從降低波形缺陷效果的觀點而言，每個單個端部是以65mm以上為佳。值得注意的是，只要第1偏光板片狀體是上述之一般尺寸(長邊700mm以上，且短邊400mm以上)，則不管其大小尺寸，藉由以較佳為65mm以上的切開寬W1來去除長邊端部， 係可以得到良好的降低波形缺陷效果。從波形缺陷更有效果地降低之觀點而言，每單個端部之切開寬W1較佳為70mm以上，更佳為80mm以上，又更佳為100mm以上，特佳為140mm以上。 Regarding the width W1 of the end of the long side that has been removed by cutting, in the case of a polarizing plate sheet having a waveform defect with a height of more than 2 mm or at least one of the long sides, the waveform defect is reduced. From the standpoint of effect, each individual end portion is preferably 65 mm or more. It is worth noting that, as long as the first polarizing plate sheet is of the above-mentioned general size (700 mm or more on the long side and 400 mm or more on the short side), regardless of its size, the cut width W1 is preferably 65 mm or more. Remove the long side ends, System can get good effect of reducing waveform defects. From the viewpoint of reducing the wave defect more effectively, the cut width W1 of each single end is preferably 70 mm or more, more preferably 80 mm or more, still more preferably 100 mm or more, and particularly preferably 140 mm or more.
如上述，會在2個短邊中產生的波形缺陷，其高度及/或個數中，相較於長邊產生的波形缺陷係有較小的傾向，又，由於短邊中之波形缺陷，相較於長邊的波形缺陷係有不易產生氣泡混入的問題之傾向，故雖不必要將短邊端部切開去除，但在短邊中為了降低波形缺陷，除了在產生波形缺陷的長邊端部之外，也可以將產生波形缺陷之短邊端部(單個端部或是兩端部)予以切開去除。每單個端部之短邊端部的切開寬W2，例如可為35mm以上，以40mm以上為佳，以45mm以上更佳。 As described above, the waveform defects that occur on the two short sides have a smaller tendency than the waveform defects that occur on the long side in terms of height and / or number, and because of the waveform defects on the short side, Compared with the long-side waveform defect, the problem of air bubble mixing is difficult to occur. Therefore, although it is not necessary to cut and remove the short-side end, in order to reduce the waveform defect on the short side, except for the long-side end of the waveform defect. In addition to the portion, the short-side end portion (single end portion or both end portions) where the waveform defect is generated may be cut and removed. The cut width W2 of the short side end portion of each single end portion may be, for example, 35 mm or more, preferably 40 mm or more, and more preferably 45 mm or more.
又，不管短邊端部是否產生波形缺陷，將短邊端部的一方或是兩方切開去除，可以由第1偏光板片狀體得到尺寸減少之第2偏光板片狀體。作為尺寸減少的具体例者，可以列舉：將46吋大小(長邊1031mm×短邊585mm)的第1偏光板片狀體的長邊端部及短邊端部切開去除，得到39吋大小(長邊860mm×短邊490mm)的第2偏光板片狀體之情形，或將39吋大小(長邊860mm×短邊490mm)的第1偏光板片狀體的長邊端部及短邊端部切開去除，得到32吋大小(長邊700mm×短邊400mm)的第2偏光板片狀體之情形等。 In addition, regardless of whether a short-side end portion has a waveform defect, one or both sides of the short-side end portion are cut and removed to obtain a second polarizing plate sheet body having a reduced size from the first polarizing plate sheet body. As a specific example of the reduction in size, the long-side end and the short-side end of the first polarizing plate sheet having a size of 46 inches (long side 1031 mm × short side 585 mm) may be cut and removed to obtain a size of 39 inches ( In the case of the second polarizing plate sheet body with a long side of 860 mm × the short side 490 mm), or the long side end and the short side end of the first polarizing plate sheet body with a size of 39 inches (long side 860 mm × the short side 490 mm) Partially cut and removed to obtain a second polarizing plate sheet having a size of 32 inches (long side 700 mm × short side 400 mm) and the like.
為了減少尺寸的切開去除中，在有高度超過 2mm的波形缺陷或是具有4個以上的波形缺陷之偏光板片狀體的情形，只要將長邊端部以每單個端部為65mm以上的切開寬W1予以去除，則可僅切開去除2個長邊端部的其中一方，也可以將雙方的長邊端部切開去除。同樣地，也可僅將2個短邊端部的其中一方切開去除，亦可將雙方的短邊端部切開去除。 In order to reduce the size of the incision and removal, In the case of a 2mm wave defect or a polarizing plate sheet body with 4 or more wave defects, as long as the long-side end is removed with a cut width W1 of 65mm or more per single end, only 2 can be cut and removed One of the long-side ends may be cut and removed from both sides. Similarly, only one of the two short-side ends may be cut and removed, and the short-side ends of both may be cut and removed.
以下，例示實施例以更具體地說明本發明，但本發明並不被此等例所侷限。在以下的例子中，波形缺陷的個數及高度，係根據下述的測定方法。 In the following, the examples are illustrated to explain the present invention more specifically, but the present invention is not limited to these examples. In the following examples, the number and height of waveform defects are based on the following measurement methods.
(波形缺陷的個數及高度) (Number and height of waveform defects)
將分離薄膜50側朝上，在平面台上放置偏光板片狀體，分別測定偏光板片狀體的2個長邊中波形缺陷之個數(如上述，限定高度是自平面台算起有0.5mm以上之波形缺陷。)，及自波形缺陷的平面台算起之高度。於表1中，記載2個長邊之中，有較多波形缺陷之長邊中的波形缺陷個數及高度。於表1中記載的波形缺陷之高度，有複數個波形缺陷的情形，係指最高波形缺陷的高度。 With the side of the separation film 50 facing up, place the polarizer sheet on a flat surface, and measure the number of waveform defects in the two long sides of the polarizer sheet (as described above, the limited height is calculated from the flat surface) Waveform defects above 0.5mm.), And the height from the flat surface of the waveform defect. In Table 1, the number and height of waveform defects in the long side with a large number of waveform defects among the two long sides are described. The height of the waveform defects listed in Table 1 may be the height of the highest waveform defect if there are multiple waveform defects.
<實驗例1> <Experimental Example 1>
[1]第1偏光板片狀體的製作 [1] Fabrication of first polarizer sheet
準備有第1圖所示層構成之長條狀偏光板。此偏光板的層構成，係厚度53μm的保護膜60(包含(甲基)丙烯酸系 黏著劑層與聚對苯二甲酸乙二酯薄膜而成)/厚度60μm的第1保護薄膜20(TAC薄膜)/厚度25μm的偏光片10(吸附定向碘之單軸延伸聚乙烯醇薄膜)/厚度52μm的第2保護薄膜30(包含環狀聚烯烴系樹脂的相位差薄膜)/厚度20μm的黏著劑層40((甲基)丙烯酸系黏著劑層)/厚度38μm的分離薄膜50(在單面經實施脫模處理之聚對苯二甲酸乙二酯薄膜)。第1保護薄膜20及第2保護薄膜30，都是隔著包含活性能量線硬化性接著劑(含有陽離子聚合性環氧系化合物的硬化性化合物與光陽離子聚合起始劑之紫外線硬化性接著劑之ADEKA(股)公司製的「KR-70T」)的硬化物之接著劑層貼合在偏光片10上。又，第1保護薄膜20及第2保護薄膜30，在40℃、相對濕度90%中之透濕度分別是560g/(m2‧24hr)、5g/(m2‧24hr)。 A long polarizing plate having a layer structure as shown in Fig. 1 was prepared. The layer structure of this polarizing plate is a protective film 60 (including a (meth) acrylic adhesive layer and a polyethylene terephthalate film) with a thickness of 53 μm / a first protective film 20 (TAC film with a thickness of 60 μm) ) / Polarizer 10 with a thickness of 25 μm (uniaxially stretched polyvinyl alcohol film that absorbs directional iodine) / Second protective film 30 with a thickness of 52 μm (a retardation film containing a cyclic polyolefin resin) 40 ((meth) acrylic-type adhesive layer) / separation film 50 (thickness polyethylene terephthalate film subjected to release treatment on one side) with a thickness of 38 μm. The first protective film 20 and the second protective film 30 are both ultraviolet curable adhesives containing an active energy ray-curable adhesive (a curable compound containing a cationically polymerizable epoxy-based compound and a photocationic polymerization initiator). An adhesive layer of a cured product of "KR-70T" manufactured by ADEKA Co., Ltd. is bonded to the polarizer 10. The moisture permeability of the first protective film 20 and the second protective film 30 at 40 ° C and a relative humidity of 90% is 560 g / (m 2 ‧24hr) and 5 g / (m 2 ‧24hr), respectively.
由上述長條狀的偏光板，切取46吋大小(長邊1031mm×短邊585mm)的長方形偏光板片狀體之後，於30℃相對濕度80%的環境下保管3天，依據上述測定方法，得到具有波形高度3.5mm，波形缺陷個數為5個之長邊的第1偏光板片狀體。 From the above-mentioned long polarizing plate, a rectangular polarizing plate sheet having a size of 46 inches (long side 1031 mm × short side 585 mm) was cut out, and then stored in an environment with a relative humidity of 80% at 30 ° C for 3 days. According to the above measurement method, A first polarizing plate sheet body having a waveform height of 3.5 mm and a long side with a number of waveform defects of 5 was obtained.
[2]第2偏光板片狀體的製作(長邊端部的切開去除) [2] Fabrication of the second polarizer sheet (cut and remove the long side end)
將在上述中得到的第1偏光板片狀體之波形高度為3.5mm，波形缺陷的個數為5個的長邊端部，使用剪切刀以10mm的寬切開去除，測定縫隙後的第2偏光板片狀體的長邊之波形缺陷的高度及個數。將此操作重覆直到全部 的切開寬(切開寬W1)成為170mm為止，調查有關切開寬W1與波形缺陷降低效果的關係。將結果在表1中表示。 The waveform height of the first polarizing plate sheet body obtained in the above was 3.5 mm, and the number of waveform defects at the long-side end of the long side was removed by a 10 mm wide cut using a shearing knife. 2 The height and number of wave defects on the long side of the polarizer sheet. Repeat this operation until all Until the incision width (incision width W1) becomes 170 mm, the relationship between the incision width W1 and the effect of reducing wave defects is investigated. The results are shown in Table 1.
<實驗例2> <Experimental Example 2>
與上述實驗例1同樣操作，得到具有波形高度3.5mm，波形缺陷個數為4個的長邊之46吋大小(長邊1031mm×短邊585mm)的第1偏光板片狀體中，將2個長邊端部，使用剪切刀，在每一單個端部分別切開去除85.5mm的同時，藉由將2個短邊端部，於每一單個端部分別切開去除47.5mm，得到尺寸減少到39吋大小(長邊860mm×短邊490mm)之第2偏光板片狀體。對於此第2偏光板片狀體，測定相當於波形高度為3.5mm、波形缺陷的個數為4個的第1偏光板片狀體之長邊的長邊中之波形缺陷的高度及個數。將結果在表2中表示。 The same operation as in the above Experimental Example 1 was performed to obtain a first polarizing plate sheet body having a waveform height of 3.5 mm and a waveform length of 46 inches (long side 1031 mm × short side 585 mm) having 4 waveform defects. For each of the long-side ends, use a cutter to cut and remove 85.5mm at each single end, and cut and remove 47.5mm at each single end by cutting the two short-side ends to obtain a size reduction. 2nd polarizer sheet-like body up to 39 inches (860mm long x 490mm short). With respect to this second polarizing plate sheet body, the height and number of waveform defects in the long sides of the long sides of the first polarizing plate sheet body having a waveform height of 3.5 mm and a number of waveform defects were measured. . The results are shown in Table 2.
其次，將在上述得到的39吋大小的第2偏光板片狀體中之2個長邊端部，使用剪切刀，將每一單個端部分別切開去除80.0mm，並且將2個的短邊端部，在每一單個端部分別切開去除45.0mm，藉此而得到大小尺寸減少到32吋大小(長邊700mm×短邊400mm)之第2偏光板片狀體。對於此第2偏光板片狀體，測定相當於在上述波形缺陷高度及個數經測定的39吋大小之第2偏光板片狀體之長邊的長邊中之波形缺陷的高度及個數。將結果在表2中表示。 Next, the two long-side ends of the 39-inch-sized second polarizing plate sheet body obtained above were cut and removed 80.0 mm from each single end with a cutter, and two short ones were cut. The side end portion was cut and removed at each individual end portion by 45.0 mm, thereby obtaining a second polarizing plate sheet body having a size reduced to 32 inches (700 mm long x 400 mm short side). With respect to this second polarizing plate sheet body, the height and number of waveform defects corresponding to the long sides of the long side of the 39-inch second polarizing plate sheet body having the above-mentioned waveform defect height and number were measured. . The results are shown in Table 2.
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| JP2005326531A (en) * | 2004-05-13 | 2005-11-24 | Nitto Denko Corp | Polarizing plate equipped with protecting film, manufacturing method therefor, and image display device using polarizing plate |
| TW200841054A (en) * | 2007-01-23 | 2008-10-16 | Sumitomo Chemical Co | Manufacturing method of polarizing film |
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| KR20170082542A (en) | 2017-07-14 |
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