TWI556019B - A method of manufacturing a polarizing member, and a method of manufacturing the polarizing plate - Google Patents
A method of manufacturing a polarizing member, and a method of manufacturing the polarizing plate Download PDFInfo
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本發明係有關於一種偏光件的製造方法及偏光板的製造方法。依照本發明的製造方法所得到的偏光件，係能夠作為在其至少一面設置透明保護薄膜而成之偏光板而使用。該等偏光件、偏光板係能夠應用在液晶顯示裝置、有機EL顯示裝置、PDP等的影像顯示裝置。 The present invention relates to a method of manufacturing a polarizing member and a method of manufacturing a polarizing plate. The polarizing material obtained by the production method of the present invention can be used as a polarizing plate in which a transparent protective film is provided on at least one surface thereof. The polarizer or the polarizing plate can be applied to a video display device such as a liquid crystal display device, an organic EL display device, or a PDP.
液晶顯示裝置係被使用在個人電腦、電視、監視器、行動電話、PDA等。先前，作為在液晶顯示裝置等所使用之偏光件，係因為必須兼具高透射率及高偏光度，所以使用經染色處理之聚乙烯醇系薄膜。該偏光件係能夠藉由對聚乙烯醇系薄膜，在浴中例如施行膨潤、染色、交聯、延伸等的各處理之後，施行洗淨處理之後，進行乾燥來製造。又，前述偏光件係通常被使用作為在其一面或兩面使用接著劑貼合三乙酸纖維素等的透明保護薄膜而成之偏光板。 The liquid crystal display device is used in a personal computer, a television, a monitor, a mobile phone, a PDA, or the like. Conventionally, as a polarizing material used in a liquid crystal display device or the like, since it is necessary to have both high transmittance and high degree of polarization, a dyed polyvinyl alcohol-based film is used. The polarizer can be produced by subjecting a polyvinyl alcohol-based film to a bath, for example, after performing various treatments such as swelling, dyeing, crosslinking, and stretching, followed by a washing treatment. Moreover, the polarizer is generally used as a polarizing plate in which a transparent protective film such as cellulose triacetate is bonded to one surface or both surfaces thereof using an adhesive.
近年來，液晶顯示裝置係進行高性能化，為了得到高視認性，液晶面板係被要求不可以有顏色不均之情形。但是，由於偏光件係在其面積全體範圍之光學特性有偏差，因而存在於許多情況係產生顏色不均。特別是因為該顏色不均的確認，不是偏光件貼合透明保護薄膜而成之 偏光板的狀態時，確認係困難的，所以在偏光件所產生的顏色不均會使材料的產率大幅度地低落。 In recent years, liquid crystal display devices have been improved in performance, and in order to obtain high visibility, liquid crystal panels are required to have no color unevenness. However, since the optical characteristics of the polarizer are varied over the entire range of the area, color unevenness occurs in many cases. In particular, because of the color unevenness, it is not the polarizing member that is bonded to the transparent protective film. In the state of the polarizing plate, it is confirmed that it is difficult, so that the color unevenness generated in the polarizing member causes the yield of the material to be greatly lowered.
作為前述減少顏色不均的方法，例如有提案揭示變更施行膨潤處理之膨潤浴的長度而控制膨潤處理時間(專利文獻1)。但是，伴隨著近年來液晶顯示裝置的大型化而逐漸被要求能夠大量也製造大面積的偏光件。又，偏光件的面積變大時，被要求在面積全體的光學特性(偏光度、單體透射率)的均勻性。而且，偏光件與修正補視野角之相位差薄膜等其他薄膜組合而使用之情形係逐漸增多，而且以短時間製造的要求亦逐漸提高。 As a method of reducing the color unevenness, for example, it is proposed to change the length of the swelling bath subjected to the swelling treatment to control the swelling treatment time (Patent Document 1). However, with the increase in size of liquid crystal display devices in recent years, it has been demanded to be able to manufacture a large-area polarizer in a large amount. Further, when the area of the polarizer is increased, uniformity of optical characteristics (polarization degree, single transmittance) of the entire area is required. Further, the use of the polarizer in combination with other films such as the phase difference film for correcting the viewing angle is gradually increased, and the demand for manufacturing in a short period of time is gradually increasing.
另一方面，為了因應以短時間製造之要求，若提高目前製造步驟全體的處理速度時，有容易產生顏色不均且產率大幅度降低之問題。依照上述專利文獻1所記載的方法，雖然能夠使如前述的顏色不均減少，但是為了因應製造大面積的偏光件，由於必須降低偏光件搬運速度、或是必須使膨潤浴的長度增長，造成必須將膨潤處理時間增長很多，而有無法因應以短時間製造偏光件的要求之問題。 On the other hand, in order to increase the processing speed of the entire manufacturing process in response to the demand for short-time manufacturing, there is a problem that color unevenness is likely to occur and the yield is greatly lowered. According to the method described in Patent Document 1, although the color unevenness as described above can be reduced, in order to manufacture a large-area polarizer, it is necessary to reduce the transport speed of the polarizer or to increase the length of the swelling bath. The swelling treatment time must be increased a lot, and there is a problem that it is impossible to cope with the requirement of manufacturing a polarizing member in a short time.
為了解決如此的問題，有揭示一種技術在膨潤步驟，設置2個以上的膨潤浴，同時控制各處理槽的溫度(專利文獻2、3)。依照此種設置有膨潤步驟之偏光件的製造方法，顏色不均係減少且能夠在短時間製造高品質的偏光件。但是專利文獻2、3的方法，有聚乙烯醇系薄膜係容易在膨潤浴中產生折疊之問題。又，有提案揭示一種方法，其係藉由除了膨潤步驟以外，並且設置進行延伸倍率1倍以 上且1.05倍以下的處理之水浸漬步驟，能夠製造光學特性、特別是色相的均勻性高的偏光件(專利文獻4)，但是因為在該方法，聚乙烯醇系薄膜亦容易在膨潤浴中產生折疊，而有無法穩定生產之問題。 In order to solve such a problem, it is disclosed that in the swelling step, two or more swelling baths are provided, and the temperature of each treatment tank is controlled (Patent Documents 2 and 3). According to such a method of manufacturing a polarizing member having a swelling step, color unevenness is reduced and a high-quality polarizer can be manufactured in a short time. However, in the methods of Patent Documents 2 and 3, there is a problem that the polyvinyl alcohol-based film is likely to be folded in the swelling bath. Moreover, there is a proposal to disclose a method by which the stretching ratio is set to 1 times in addition to the swelling step. In the water immersion step of 1.05 times or less, it is possible to produce a polarizer having high optical characteristics, particularly uniformity of hue (Patent Document 4), but in this method, the polyvinyl alcohol film is also easily used in the swelling bath. Folding occurs, and there is a problem that production cannot be stabilized.
專利文獻1：日本特開2004-78208號公報 Patent Document 1: Japanese Laid-Open Patent Publication No. 2004-78208
專利文獻2：日本特開2006-65309號公報 Patent Document 2: Japanese Laid-Open Patent Publication No. 2006-65309
專利文獻3：日本特開2006-267153號公報 Patent Document 3: Japanese Laid-Open Patent Publication No. 2006-267153
專利文獻4：日本特開2008-249766號公報 Patent Document 4: Japanese Laid-Open Patent Publication No. 2008-249766
本發明之目的，係提供一種具有高光學特性且即便高速生產具有高光學特性且經抑制顏色不均之偏光件，亦能夠穩定地製造之偏光件的製造方法。又，本發明之目的，係提供一種藉由前述製造方法製造偏光件之後，使用所得到的偏光件之偏光板的製造方法 An object of the present invention is to provide a method for producing a polarizing member which has high optical characteristics and can be stably manufactured even if a polarizing member having high optical characteristics and suppressing color unevenness is produced at a high speed. Moreover, an object of the present invention is to provide a method of manufacturing a polarizing plate using the obtained polarizing member after manufacturing the polarizing member by the above-described manufacturing method.
本發明者等為了解決前述課題而重複專心研討的結果，發現藉由以下所表示之偏光件的製造方法等，能夠達成前述目的，而完成了本發明。 In order to solve the above problems, the inventors of the present invention have succeeded in the study of the above-described problems, and have found that the above object can be attained by the method for producing a polarizer as described below, and the present invention has been completed.
亦即，本發明係有關於一種偏光件的製造方法，其係對聚乙烯醇系薄膜至少施行膨潤步驟、染色步驟及延 伸步驟；其中前述膨潤步驟係具有至少2階段之下述步驟，該步驟係藉由配置於處理液中之至少1支導輥將聚乙烯醇系薄膜浸漬於各處理液；第1階段的步驟，係在聚乙烯醇系薄膜浸漬於處理液的長度之移動方向的70%以後之位置上，設置曲率半徑為2000~50000mm之擴寬輥作為導輥，而且，第1階段的步驟，係以處理液溫度為33~50℃、縱向的延伸倍率為1.2~2.5倍之方式進行延伸；第2階段以後的步驟，係以縱向的延伸倍率為1.06~1.2倍之方式進行延伸。 That is, the present invention relates to a method for producing a polarizing member, which comprises performing at least a swelling step, a dyeing step, and a stretching on a polyvinyl alcohol-based film. a step of stretching; wherein the swelling step has at least two steps of immersing the polyvinyl alcohol-based film in each of the treatment liquids by at least one of the guide rolls disposed in the treatment liquid; In the case where the polyvinyl alcohol-based film is immersed at 70% of the moving direction of the length of the treatment liquid, a widened roll having a radius of curvature of 2,000 to 50,000 mm is provided as a guide roll, and the step of the first stage is The temperature of the treatment liquid is 33 to 50 ° C, and the stretching ratio in the longitudinal direction is 1.2 to 2.5 times. The steps after the second stage are extended in the longitudinal stretching ratio of 1.06 to 1.2 times.
在前述偏光件的製造方法中，前述膨潤步驟之第1階段的步驟中縱向的延伸倍率係以1.2~2.2倍為佳。 In the method for producing a polarizer, the longitudinal stretching ratio in the first step of the swelling step is preferably 1.2 to 2.2 times.
在前述偏光件的製造方法中，前述膨潤步驟之縱向中總延伸倍率係以1.3~2.4倍為佳。 In the method for producing a polarizing member, the total stretching ratio in the longitudinal direction of the swelling step is preferably 1.3 to 2.4 times.
在前述偏光件的製造方法中，第2階段以後的步驟中處理液溫度係以比第1處理液溫度低3℃以上為佳。 In the method for producing a polarizer, the temperature of the treatment liquid in the second and subsequent steps is preferably 3 ° C or more lower than the temperature of the first treatment liquid.
又，本發明係有關於一種偏光板的製造方法，其特徵在於係於藉由前述製造方法製造偏光件之後，在所得到之偏光件的至少一面貼合透明保護薄膜。 Moreover, the present invention relates to a method for producing a polarizing plate, characterized in that after a polarizing member is manufactured by the above-described manufacturing method, a transparent protective film is bonded to at least one surface of the obtained polarizing member.
在上述本發明之偏光件的製造方法，係對聚乙烯醇系薄膜以至少2階段進行膨潤步驟。而且第1階段的步驟係在處理液中以預定位置的方式設置具有預定曲率半徑之 擴寬輥，來使聚乙烯醇系薄膜擴寬。而且，第1階段的步驟，係進行將處理液控制為預定溫度且對聚乙烯醇系薄膜以預定延伸倍率的方式邊控制、邊延伸。 In the above method for producing a polarizing member of the present invention, the polyvinyl alcohol-based film is subjected to a swelling step in at least two stages. And the step of the first stage is set in the treatment liquid at a predetermined position to have a predetermined radius of curvature The roll was widened to widen the polyvinyl alcohol film. Further, in the first step, the treatment liquid is controlled to a predetermined temperature, and the polyvinyl alcohol-based film is controlled and extended while being at a predetermined stretching ratio.
本發明係藉由膨潤步驟，除了能夠將聚乙烯醇系薄膜表面的污染和抗黏結劑洗淨以外，藉由在設定於高溫度的膨潤浴將聚乙烯醇系薄膜進行膨潤，能夠防止染色不均(顏色不均)等的不均勻，又，藉由在膨潤浴邊較低地控制縱向的延伸倍率、邊使聚乙烯醇系薄膜膨潤，能夠製造具高光學特性(偏光度、單體透射率)之偏光件。又，藉由在膨潤浴的後半設置擴寬輥，即便高速生產時，在聚乙烯醇系薄膜亦不產生折疊而能夠穩定地製造。 In the present invention, in addition to being able to clean the surface of the polyvinyl alcohol-based film and the anti-adhesive agent by the swelling step, the polyvinyl alcohol-based film can be swollen in a swelling bath set at a high temperature, thereby preventing dyeing. Inhomogeneity (color unevenness) and the like, and high optical properties (polarization, single transmission) can be produced by controlling the longitudinal stretching ratio at the lower side of the swelling bath and swelling the polyvinyl alcohol film. Rate) polarizer. Further, by providing the widening roller in the latter half of the swelling bath, even in the case of high-speed production, the polyvinyl alcohol-based film can be stably produced without folding.
L‧‧‧聚乙烯醇系薄膜的長度(虛線) Length of L‧‧‧ polyvinyl alcohol film (dashed line)
R‧‧‧導輥 R‧‧·guide roller
R11~R14‧‧‧導輥 R11~R14‧‧·guide roller
R21~R24‧‧‧導輥 R21~R24‧‧·guide roller
p1‧‧‧薄膜的浸漬開始位置 P1‧‧‧ film impregnation start position
p2‧‧‧薄膜的浸漬結束位置 P2‧‧‧ film immersion end position
X(X1、X2)‧‧‧處理液 X (X1, X2) ‧ ‧ treatment solution
Y(Y1、Y2)‧‧‧處理浴 Y (Y1, Y2) ‧ ‧ treatment bath
S1‧‧‧第1階段 S1‧‧‧ Phase 1
S2‧‧‧第2階段 S2‧‧‧ Phase 2
W‧‧‧聚乙烯醇系薄膜 W‧‧‧ polyvinyl alcohol film
圖1係顯示在本發明偏光件的製造方法中膨潤步驟的一個例子之概念圖。 Fig. 1 is a conceptual diagram showing an example of a swelling step in the method of manufacturing a polarizing member of the present invention.
作為應用在本發明之偏光件的製造方法之聚乙烯醇系薄膜，係沒有特別限制而能夠使用在可見光區域具有透光性且將碘或二色性染料等的二色性物質分散吸附者。通常，聚乙烯醇系薄膜係能夠使用厚度為10~300μm左右者，較佳是20~100μm。 The polyvinyl alcohol-based film to be used in the method for producing a polarizing material of the present invention is not particularly limited, and a dichroic material such as iodine or a dichroic dye can be dispersed and adsorbed in the visible light region. Usually, the polyvinyl alcohol-based film can be used in a thickness of about 10 to 300 μm, preferably 20 to 100 μm.
作為聚乙烯醇系薄膜，例如適合使用先前被使用作為偏光件之聚乙烯醇系薄膜。作為聚乙烯醇系薄膜的材料，可舉出聚乙烯醇或其衍生物。作為聚乙烯醇的衍生物， 可舉出聚乙烯基甲縮醛、聚乙烯基縮醛等、以及使用乙烯、丙烯等的烯烴、丙烯酸、甲基丙烯酸、巴豆酸等的不飽和羧酸及其烷酯、丙烯醯胺等改性而成者。聚乙烯醇的聚合度係以100~10000左右為佳，以1000~10000為較佳。皂化度係通常使用80~100莫耳%左右者。 As the polyvinyl alcohol-based film, for example, a polyvinyl alcohol-based film which has been previously used as a polarizing material is suitably used. The material of the polyvinyl alcohol-based film may, for example, be polyvinyl alcohol or a derivative thereof. As a derivative of polyvinyl alcohol, Examples thereof include polyvinyl acetal, polyvinyl acetal, and the like, and an olefin such as ethylene or propylene, an unsaturated carboxylic acid such as acrylic acid, methacrylic acid or crotonic acid, an alkyl ester thereof, or a acrylamide. Sexuality. The degree of polymerization of the polyvinyl alcohol is preferably from about 100 to 10,000, more preferably from 1,000 to 10,000. The degree of saponification is usually about 80 to 100 mol%.
上述以外，作為聚乙烯醇系薄膜，可舉出乙烯-乙酸乙烯酯共聚合物系部分皂化薄膜等的親水性高分子薄膜、聚乙烯醇的脫水處理物、聚氯乙烯的脫鹽酸處理物等多烯系配向薄膜等。 In addition, as the polyvinyl alcohol-based film, a hydrophilic polymer film such as an ethylene-vinyl acetate copolymer-based partially saponified film, a dehydrated product of polyvinyl alcohol, a dehydrochlorinated product of polyvinyl chloride, or the like may be mentioned. A polyene alignment film or the like.
前述聚乙烯醇系薄膜中，亦能夠含有可塑劑、界面活性劑等的添加劑。作為可塑劑，可舉出多二醇及其縮合物等，例如可舉出甘油、雙甘油、參甘油、乙二醇、丙二醇、聚乙二醇等。可塑劑等的使用量係沒有特別限制，以聚乙烯醇系薄膜中20重量%以下為適合。 The polyvinyl alcohol-based film may contain an additive such as a plasticizer or a surfactant. Examples of the plasticizer include a polydiol and a condensate thereof, and examples thereof include glycerin, diglycerin, glycerin, ethylene glycol, propylene glycol, and polyethylene glycol. The amount of the plasticizer or the like to be used is not particularly limited, and is preferably 20% by weight or less based on the polyvinyl alcohol-based film.
本發明之偏光件的製造方法，係對聚乙烯醇系薄膜施行膨潤步驟、染色步驟、及延伸步驟。首先，對聚乙烯醇系薄膜係首先施行膨潤步驟。將前述膨潤步驟施行2階段以上。各膨潤步驟係藉由經過在處理液中所配置的導輥而浸漬於各處理液來進行。 In the method for producing a polarizing member of the present invention, the polyvinyl alcohol-based film is subjected to a swelling step, a dyeing step, and an extending step. First, the polyvinyl alcohol-based film system is first subjected to a swelling step. The aforementioned swelling step is carried out in two or more stages. Each swelling step is performed by immersing in each treatment liquid through a guide roller disposed in the treatment liquid.
第1階段的膨潤步驟係能夠使用擴寬輥作為導輥。該擴寬輥係設置在聚乙烯醇系薄膜浸漬於處理液的長度之移動方向(縱向：MD方向)的70%以後之位置。前述擴寬輥的設置位置之聚乙烯醇系薄膜的長度，係將聚乙烯醇系薄膜開始浸漬於處理液之位置設作0%，且將處理液的浸 漬結束之位置設作100%。前述擴寬輥的設置位置之值係以前述薄膜的長度100%作為基準而算出。擴寬輥的設置位置係將聚乙烯醇系薄膜接觸擴寬輥之最初的位置作為基準。前述擴寬輥的設置位置之值係70%以前時，在薄膜會產生折疊。從抑制薄膜折疊之觀點，前述擴寬輥的設置位置之值以75%以後為佳，以80%以後為較佳，以85%以後為更佳。藉由將擴寬輥設置在膨潤浴的後半，即便使膨潤浴的處理液的溫度為較高溫時，亦能夠抑制薄膜折疊。 The swelling step of the first stage can use a widening roll as a guide roll. This widened roll is provided in a position where the polyvinyl alcohol-based film is immersed in 70% of the moving direction (longitudinal direction: MD direction) of the length of the treatment liquid. The length of the polyvinyl alcohol-based film at the position where the widening roller is disposed is set to 0% at the position where the polyvinyl alcohol-based film is immersed in the treatment liquid, and the treatment liquid is immersed. The position where the stain ends is set to 100%. The value of the installation position of the widened roller was calculated based on 100% of the length of the film. The position where the widening roller is disposed is based on the initial position at which the polyvinyl alcohol-based film contacts the widening roller. When the value of the position where the above-mentioned widening roller is set is 70% or more, folding occurs in the film. From the viewpoint of suppressing the folding of the film, the value of the position where the widening roller is disposed is preferably 75% or later, preferably 80% or later, and more preferably 85% or later. By providing the widening roll in the latter half of the swelling bath, even when the temperature of the treatment liquid of the swelling bath is made higher, the film folding can be suppressed.
擴寬輥係指具有曲線具有局部性的彎曲而能夠使所搬運的薄膜擴寬的功能之輥。作為擴寬輥，例如可舉出擴展輥(expander roll)、凸面輥(crown roll)等。本發明係以使用擴展輥作為擴寬輥為佳。 The widening roller refers to a roller having a function of bending a local curve and widening the film to be conveyed. Examples of the widening roller include an expander roll, a crown roll, and the like. The present invention preferably uses a spreading roll as the widening roll.
又，作為前述擴寬輥，係使用曲率半徑為2000~50000mm者。前述曲率半徑係以4000~40000mm為佳。曲率半徑係使擴寬輥之曲線的局部性彎曲情況近似圓時之其圓的半徑。擴寬輥的曲率半徑小於2000mm時，因為膨潤係變為不均勻致使產生顏色不均。另一方面，擴寬輥的曲率半徑大於50000時，在薄膜產生折疊。 Further, as the widening roller, a radius of curvature of 2,000 to 50,000 mm is used. The aforementioned radius of curvature is preferably 4,000 to 40,000 mm. The radius of curvature is such that the local bending of the curve of the widening roller approximates the radius of its circle when it is round. When the radius of curvature of the widening roller is less than 2000 mm, color unevenness is caused because the swelling becomes uneven. On the other hand, when the radius of curvature of the widening roller is more than 50,000, folding occurs in the film.
以下，邊參照圖式、邊說明本發明的膨潤步驟。圖1係顯示在膨潤步驟之聚乙烯醇系薄膜W、導輥R及處理液X的關係之概念圖。在圖1，膨潤步驟係具有2階段的情況，各自係第1階段的步驟為設作S1，第2階段的步驟為設作S2來表示。膨潤步驟S1、S2係在各處理槽Y(Y1、Y2)內具有處理液X(X1、X2)。各處理液X之中係具有至少1支導 輥R。在處理液X之中配置至少1支導輥R即可，亦可以在處理液X之中配置複數支導輥R。 Hereinafter, the swelling step of the present invention will be described with reference to the drawings. Fig. 1 is a conceptual diagram showing the relationship between the polyvinyl alcohol-based film W, the guide roller R, and the treatment liquid X in the swelling step. In Fig. 1, the swelling step has two stages, and the steps of the first stage are set to S1, and the steps of the second stage are set to S2. The swelling steps S1 and S2 have the treatment liquid X (X1, X2) in each of the treatment tanks Y (Y1, Y2). Each treatment liquid X has at least 1 branch Roller R. At least one guide roller R may be disposed in the treatment liquid X, and a plurality of support rollers R may be disposed in the treatment liquid X.
S1係有關於第1階段的膨潤步驟，處理槽Y1係具有處理液X1，經過在該處理液X1的內外所配置之導輥R11至R14，依照該等導輥的順序將聚乙烯醇系薄膜W邊在處理液X1浸漬處理、邊搬運。藉由使前述聚乙烯醇系薄膜W通過處理液X1內而被處理液X1處理。在圖1，導輥R11及R14係位於處理液X1的外部，導輥R12及R13係被配置在處理液X1內之情況。 S1 is a swelling step in the first stage, and the treatment tank Y1 has a treatment liquid X1, and passes through the guide rolls R11 to R14 disposed inside and outside the treatment liquid X1, and the polyvinyl alcohol film is formed in the order of the guide rolls. W is immersed in the treatment liquid X1 and conveyed while being processed. The polyvinyl alcohol-based film W is treated by the treatment liquid X1 by passing it through the treatment liquid X1. In Fig. 1, the guide rolls R11 and R14 are located outside the process liquid X1, and the guide rolls R12 and R13 are disposed in the process liquid X1.
又，在第1階段的膨潤步驟，係使用擴寬輥作為導輥。在圖1，係使用擴寬輥作為導輥R13。前述擴寬輥的設置位置係如前述，係將聚乙烯醇系薄膜W開始浸漬於處理液X1之位置設作0%，且將處理液X1的浸漬結束p2之位置設作100%，以該等p1與p2之間之聚乙烯醇系薄膜W的長度L(虛線)作為基準，且以接觸導輥R13(擴寬輥)之最初的位置為70%以後的方式設置。又，在圖1，導輥R12及R13係被配置在處理液X1內，但是在處理液X1內係不配置導輥R12，而只配置導輥R13(擴寬輥)之情況，導輥R13(擴寬輥)係以能夠滿足前述設置位置為70%以後的方式設置。又，在第1階段的膨潤步驟，作為除了擴寬輥以外的導輥，係以使用平滑輥(flat roll)為佳。 Moreover, in the swelling step of the first stage, a widening roll was used as the guide roll. In Fig. 1, a widening roller is used as the guide roller R13. The position where the widening roller is disposed is set to 0% at the position where the polyvinyl alcohol-based film W starts to be immersed in the treatment liquid X1, and the position at which the immersion completion p2 of the treatment liquid X1 is set to 100%. The length L (broken line) of the polyvinyl alcohol-based film W between p1 and p2 is set as a reference, and the initial position of the contact roller R13 (widening roller) is 70% or later. In addition, in FIG. 1, the guide rolls R12 and R13 are arrange|positioned in the process liquid X1, but the guide roll R12 is not arrange|positioned, and only the guide roll R13 (widening roll) is arrange|positioned in the process liquid X1, and the guide roll R13. The (widening roller) is provided so as to satisfy the above-described installation position of 70% or later. Moreover, in the swelling step of the first stage, it is preferable to use a flat roll as a guide roll other than the widening roll.
S2係有關於第2階段的膨潤步驟，處理槽Y2係具有處理液X2，經過在該處理液X2的內外所配置的導輥R21至R24，將聚乙烯醇系薄膜W依照該等導輥的順序，邊在處 理液X2浸漬處理、邊搬運。藉由前述聚乙烯醇系薄膜W係通過處理液X2內而被處理液X2處理。在圖1，導輥R21及R24係位於處理液X2的外部，且導輥R22及R23係被配置在處理液X1內之情況。又，在第2階段的膨潤步驟，只要在處理液X2之中導輥R係配置至少1支，其配置等係沒有特別限制，亦可以在處理液X2內配置複數支導輥R。 S2 is a swelling step in the second stage, and the treatment tank Y2 has the treatment liquid X2, and the polyvinyl alcohol-based film W is placed in accordance with the guide rolls through the guide rolls R21 to R24 disposed inside and outside the treatment liquid X2. Order, side is everywhere The chemical solution X2 is immersed and transported. The polyvinyl alcohol-based film W is treated in the treatment liquid X2 by the treatment liquid X2. In Fig. 1, the guide rolls R21 and R24 are located outside the process liquid X2, and the guide rolls R22 and R23 are disposed in the process liquid X1. In addition, in the swelling step of the second stage, at least one of the guide rolls R is disposed in the treatment liquid X2, and the arrangement thereof is not particularly limited, and a plurality of branch rolls R may be disposed in the treatment liquid X2.
又，針對第3階段以後的膨潤步驟，亦是與第2階段的膨潤步驟同樣地，導輥的配置係沒有特別限制。 Further, in the swelling step after the third stage, similarly to the swelling step of the second stage, the arrangement of the guide rolls is not particularly limited.
作為在前述膨潤步驟所使用之處理液，通常係使用水、蒸餾水、純水。該處理液係主成分為水時，亦可以少量添加下述所表示之碘化化合物、界面活性劑等的添加物、醇等。又，使該處理液含有碘化化合物時，碘化化合物濃度係0.1~10重量%左右，以使用0.2~5重量%為更佳。又，在膨潤步驟的各階段所使用之處理液(濃度、添加物等)係可以相同，亦可以不同。 As the treatment liquid used in the swelling step, water, distilled water, and pure water are usually used. When the main component of the treatment liquid is water, an additive such as an iodinated compound or a surfactant described below, an alcohol, or the like may be added in a small amount. Further, when the treatment liquid contains an iodinated compound, the concentration of the iodinated compound is about 0.1 to 10% by weight, and more preferably 0.2 to 5% by weight. Further, the treatment liquid (concentration, additive, etc.) used in each stage of the swelling step may be the same or different.
在膨潤步驟之處理液的溫度係在各階段進行控制。第1階段的膨潤步驟，處理液的溫度係33~50℃，較佳是35~48℃，更佳是37~45℃。第1階段的步驟之處理液的溫度為小於33℃時，在所得到的偏光件產生顏色不均。另一方面，大於50℃時，聚乙烯醇系薄膜係溶出。第2階段以後的膨潤步驟之處理液的溫度，係通常以調整為20~45℃左右為佳。以25~40℃為更佳。特別是第2階段以後之處理液的溫度，就抑制在第2階段以後的步驟之薄膜折疊而言，係以比第1階段的處理液溫度低3℃以上的方式設定為佳。第2階 段以後之處理液的溫度係以設定為低5℃以上為更佳。又，在膨潤步驟的浸漬時間係在各階段的任一者均是通常為10~300秒鐘左右，較佳是20~240秒鐘的範圍。 The temperature of the treatment liquid in the swelling step is controlled at each stage. In the first stage of the swelling step, the temperature of the treatment liquid is 33 to 50 ° C, preferably 35 to 48 ° C, more preferably 37 to 45 ° C. When the temperature of the treatment liquid in the first step is less than 33 ° C, color unevenness occurs in the obtained polarizer. On the other hand, when it is more than 50 ° C, the polyvinyl alcohol-based film is eluted. The temperature of the treatment liquid in the swelling step after the second stage is usually adjusted to about 20 to 45 ° C. It is preferably 25 to 40 ° C. In particular, the temperature of the treatment liquid after the second stage is preferably set so as to suppress the film folding in the step after the second stage by 3 ° C or more lower than the temperature of the treatment liquid in the first stage. Second order The temperature of the treatment liquid after the stage is preferably set to be 5 ° C or lower. Further, the immersion time in the swelling step is usually in the range of about 10 to 300 seconds, preferably 20 to 240 seconds, in each stage.
又，膨潤步驟係在縱向進行延伸。藉由在膨潤步驟施行延伸，能夠將在膨潤步驟後所施行的延伸步驟之延伸控制為較小且能夠以薄膜不產生延伸斷裂的方式控制。另一方面，在膨潤步驟的延伸倍率變大時，在延伸步驟的延伸倍率變小，特別是在交聯步驟之後施行延伸步驟的情況，就光學特性而言，乃是不佳。在第1階段的膨潤步驟，相對於聚乙烯醇系薄膜的原來長度，係以縱向的延伸倍率為1.2~2.5倍的方式進行延伸。從抑制薄膜折疊之觀點，前述延伸倍率係以1.3倍以上為佳，以1.4倍以上更佳。另一方面，從光學特性之觀點，前述延伸倍率係以2.3倍以下為佳，以2.2倍以下為更佳，以2.1倍以下為又更佳。而且，前述延伸倍率係以1.2~2.3倍為佳，以1.2~2.2倍為更佳，以1.4~2.1倍為又更佳。前述延伸倍率小於1.2倍時，在薄膜產生折疊。另一方面，前述延伸倍率大於2.5倍時，就所得到之偏光件的光學特性而言，乃是不佳。 Also, the swelling step is extended in the longitudinal direction. By performing the stretching in the swelling step, the extension of the stretching step performed after the swelling step can be controlled to be small and can be controlled in such a manner that the film does not cause elongation fracture. On the other hand, when the stretching ratio in the swelling step becomes large, the stretching ratio in the stretching step becomes small, and particularly in the case where the stretching step is performed after the crosslinking step, it is not preferable in terms of optical characteristics. In the swelling step of the first stage, the stretching is performed so that the longitudinal stretching ratio is 1.2 to 2.5 times with respect to the original length of the polyvinyl alcohol-based film. From the viewpoint of suppressing film folding, the aforementioned stretching ratio is preferably 1.3 times or more, more preferably 1.4 times or more. On the other hand, from the viewpoint of optical characteristics, the stretching ratio is preferably 2.3 times or less, more preferably 2.2 times or less, and still more preferably 2.1 times or less. Further, the stretching ratio is preferably 1.2 to 2.3 times, more preferably 1.2 to 2.2 times, and even more preferably 1.4 to 2.1 times. When the aforementioned stretching ratio is less than 1.2 times, folding occurs in the film. On the other hand, when the stretching ratio is more than 2.5 times, the optical characteristics of the obtained polarizing member are not preferable.
又，在第2階段以後的膨潤步驟，相對於聚乙烯醇系薄膜(第1階段延伸後的薄膜)的原來長度，係以縱向的延伸倍率為1.06~1.2倍的方式進行延伸。從抑制薄膜折疊而言，前述延伸倍率係以設為1.06倍以上為佳。另一方面，就使所得到的偏光件滿足光學特性而言，前述延伸倍率係以設為1.2倍以下為佳。 In addition, in the swelling step after the second stage, the original length of the polyvinyl alcohol-based film (the film after the first-stage stretching) is extended so that the stretching ratio in the longitudinal direction is 1.06 to 1.2 times. From the viewpoint of suppressing film folding, the stretching ratio is preferably 1.06 times or more. On the other hand, in order to satisfy the optical characteristics of the obtained polarizer, the above-described stretching ratio is preferably 1.2 times or less.
在前述膨潤步驟之縱向的總延伸倍率(包含第1階段及第2階段以後之總延伸倍率)，係相對於聚乙烯醇系薄膜的原來長度，以1.3~2.4倍的方式延伸為佳。從抑制薄膜折疊而言，總延伸倍率係以設為1.3倍以上為佳。另一方面，就使所得到的偏光件滿足光學特性而言，總延伸倍率係以設為2.4倍以下為佳。 The total stretching ratio in the longitudinal direction of the swelling step (including the total stretching ratio after the first stage and the second stage) is preferably from 1.3 to 2.4 times the original length of the polyvinyl alcohol-based film. From the viewpoint of suppressing film folding, the total stretching ratio is preferably set to 1.3 times or more. On the other hand, in order to satisfy the optical characteristics of the obtained polarizer, the total stretch ratio is preferably 2.4 times or less.
施行前述膨潤步驟之後，係至少施行染色步驟、延伸步驟。 After performing the aforementioned swelling step, at least a dyeing step and an extending step are performed.
染色步驟係藉由使上述聚乙烯醇系薄膜將碘或二色性染料吸附、配向來進行。染色步驟係亦能夠與延伸步驟同時進行。一般而言，染色係通常藉由將上述薄膜浸漬於染色溶液來進行。作為染色溶液，係通常為碘溶液。作為碘溶液所使用的碘水溶液，能夠使用藉由碘及溶解助劑之碘化化合物使其含有碘離子之水溶液等。碘化化合物，例如能夠使用碘化鉀、碘化鋰、碘化鈉、碘化鋅、碘化鋁、碘化鉛、碘化銅、碘化鋇、碘化鈣、碘化錫、碘化鈦等。作為碘化化合物，係以碘化鉀為佳。在本發明所使用之碘化化合物，針對在其他步驟使用時，亦與上述同樣。 The dyeing step is carried out by adsorbing and aligning the iodine or the dichroic dye with the polyvinyl alcohol-based film. The dyeing step can also be carried out simultaneously with the stretching step. In general, the dyeing system is usually carried out by immersing the above film in a dyeing solution. As the dyeing solution, it is usually an iodine solution. As the aqueous iodine solution used for the iodine solution, an aqueous solution containing an iodide ion by an iodinated compound of iodine or a dissolution aid can be used. As the iodinated compound, for example, potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, cesium iodide, calcium iodide, tin iodide, titanium iodide or the like can be used. As the iodinated compound, potassium iodide is preferred. The iodinated compound used in the present invention is also the same as described above when used in other steps.
碘溶液中的碘濃度係0.01~1重量%左右，較佳是0.02~0.5重量%。碘化化合物濃度係0.1~10重量%左右，以使用0.2~8重量%為更佳。在碘染色時，碘溶液的溫度係通常為20~50℃左右，較佳是25~40℃。浸漬時間係通常為10~300秒鐘左右，較佳是20~240秒鐘的範圍。 The iodine concentration in the iodine solution is about 0.01 to 1% by weight, preferably 0.02 to 0.5% by weight. The concentration of the iodinated compound is about 0.1 to 10% by weight, more preferably 0.2 to 8% by weight. In the case of iodine dyeing, the temperature of the iodine solution is usually about 20 to 50 ° C, preferably 25 to 40 ° C. The immersion time is usually about 10 to 300 seconds, preferably 20 to 240 seconds.
延伸步驟係通常藉由施行單軸延伸來進行。該延 伸方法係能夠與染色步驟、後述的交聯步驟同時施行。延伸方法係能夠採用濕潤式延伸方法和乾式延伸方法的任一種，在本發明，係以使用濕潤式延伸方法為佳。作為濕潤式延伸方法，一般而言係例如施行染色步驟之後，進行延伸。又，亦能夠與交聯步驟同時進行延伸。另一方面，乾式延伸時，作為延伸手段，係例如可舉出輥間延伸方法、加熱輥延伸方法、壓縮延伸方法等。在前述延伸手段，未延伸薄膜係通常設為加熱狀態。延伸步驟亦能夠以多段進行。 The extension step is typically performed by performing a uniaxial extension. The delay The stretching method can be carried out simultaneously with the dyeing step and the crosslinking step described later. The stretching method can employ either a wet stretching method or a dry stretching method, and in the present invention, a wet stretching method is preferably used. As a wet stretching method, it is generally carried out, for example, after performing a dyeing step. Moreover, it is also possible to carry out the extension simultaneously with the crosslinking step. On the other hand, in the case of dry stretching, examples of the stretching means include a method of extending between rolls, a method of stretching a heating roll, a method of compressing and stretching, and the like. In the above extension means, the unstretched film system is usually in a heated state. The extension step can also be carried out in multiple stages.
能夠使在濕潤式延伸方法所使用的處理液含有碘化化合物。使該處理液含有碘化化合物時，碘化化合物濃度係0.1~10重量%左右，以使用0.2~5重量%為更佳。在濕潤式延伸方法之處理溫度係通常為25℃以上，較佳是30~85℃，更佳是30~60℃的範圍。浸漬時間係通常為10~800秒鐘，較佳是30~500秒鐘左右。 The treatment liquid used in the wet extension method can contain an iodinated compound. When the treatment liquid contains an iodinated compound, the concentration of the iodinated compound is about 0.1 to 10% by weight, and more preferably 0.2 to 5% by weight. The treatment temperature in the wet stretching method is usually 25 ° C or higher, preferably 30 to 85 ° C, more preferably 30 to 60 ° C. The immersion time is usually from 10 to 800 seconds, preferably from about 30 to 500 seconds.
在延伸步驟，總延伸倍率係相對於聚乙烯醇系薄膜的原來長度，以總延伸倍率為3~17倍的範圍之方式進行。較佳是4~10倍，更佳是4~8倍。亦即，前述總延伸倍率係指累積延伸倍率，包含膨脹濕潤步驟，而且伴隨著其他的步驟之延伸時亦包含在其等步驟之延伸。總延伸倍率係考慮在膨潤步驟等之延伸倍率而適當地決定。總延伸倍率低時，配向不足而難以得到高光學特性(偏光度)的偏光件。另一方面，總延伸倍率太高時，容易產生延伸斷掉，又，偏光件變為太薄，在接續步驟的加工性有低落之可能性。 In the stretching step, the total stretching ratio is carried out in a range of 3 to 17 times the total stretching ratio with respect to the original length of the polyvinyl alcohol-based film. It is preferably 4 to 10 times, more preferably 4 to 8 times. That is, the aforementioned total stretch ratio refers to the cumulative stretch ratio, including the expansion and wetting step, and is also included in the extension of the steps along with the extension of the other steps. The total stretching ratio is appropriately determined in consideration of the stretching ratio at the swelling step or the like. When the total stretching ratio is low, the polarizing member is insufficient in alignment and it is difficult to obtain high optical characteristics (polarity). On the other hand, when the total stretching ratio is too high, elongation is likely to occur, and the polarizing member becomes too thin, and the workability in the subsequent step is likely to be low.
本發明之偏光件的製造方法，係如上述施行膨潤步驟，而且至少施行染色步驟、延伸步驟，此外，能夠施行交聯步驟。交聯步驟係通常使用硼化合物作交聯劑而進行。交聯步驟的順序係沒有特別限制。交聯步驟係能夠與延伸步驟同時進行。交聯步驟係能夠進行複數次。作為硼化合物，可舉出硼酸、硼砂等。一般而言，硼化合物係能夠以水溶液或水-有機溶劑混合溶液的形態使用。通常係使用硼酸水溶液。硼酸水溶液的硼酸濃度係2~15重量%左右，較佳是3~13重量%。藉由交聯度來賦予耐熱性，係以前述硼酸濃度為佳。在硼酸水溶液等，係能夠使其碘化鉀等的碘化化合物。使硼酸水溶液含有碘化化合物時，碘化化合物濃度係0.1~10重量%左右，以使用0.2~5重量%為更佳。 In the method for producing a polarizing member of the present invention, the swelling step is carried out as described above, and at least the dyeing step and the stretching step are carried out, and further, the crosslinking step can be carried out. The crosslinking step is usually carried out using a boron compound as a crosslinking agent. The order of the crosslinking step is not particularly limited. The crosslinking step can be carried out simultaneously with the stretching step. The crosslinking step can be performed multiple times. Examples of the boron compound include boric acid, borax, and the like. In general, the boron compound can be used in the form of an aqueous solution or a water-organic solvent mixed solution. An aqueous boric acid solution is usually used. The boric acid concentration of the aqueous boric acid solution is about 2 to 15% by weight, preferably 3 to 13% by weight. The heat resistance is imparted by the degree of crosslinking, and the concentration of the above boric acid is preferred. An aqueous solution of boric acid or the like is an iodinated compound such as potassium iodide. When the boric acid aqueous solution contains the iodinated compound, the concentration of the iodinated compound is about 0.1 to 10% by weight, and more preferably 0.2 to 5% by weight.
交聯步驟係能夠藉由將前述聚乙烯醇系薄膜浸漬於硼酸水溶液等來進行。此外，亦能夠對前述聚乙烯醇系薄膜，將硼化合物等應用塗布法、噴霧法等來進行。在交聯步驟之處理溫度係通常為25℃以上，較佳是30~85℃，更佳是30~60℃的範圍。處理時間係通常為5~800秒鐘，較佳是8~500秒鐘左右。 The crosslinking step can be carried out by immersing the polyvinyl alcohol-based film in an aqueous solution of boric acid or the like. In addition, a boron compound or the like can be applied to the polyvinyl alcohol-based film by a coating method, a spray method, or the like. The treatment temperature in the crosslinking step is usually 25 ° C or higher, preferably 30 to 85 ° C, more preferably 30 to 60 ° C. The processing time is usually 5 to 800 seconds, preferably 8 to 500 seconds.
本發明之偏光件的製造方法，係如上述施行膨潤步驟，進而施行染色步驟及延伸步驟、而且施行交聯步驟之後，能夠施行洗淨步驟。在洗淨步驟之前，除了上述步驟以外，亦能夠施行金屬離子處理。金屬離子處理係藉由將聚乙烯醇系薄膜浸漬於含有金屬鹽的水溶液來進行。藉 由金屬離子處理，使聚乙烯醇系薄膜中含有各種金屬離子。 In the method for producing a polarizer according to the present invention, the swelling step can be carried out as described above, and the dyeing step and the stretching step can be carried out, and after the crosslinking step, the washing step can be performed. In addition to the above steps, metal ion treatment can also be performed before the washing step. The metal ion treatment is carried out by immersing the polyvinyl alcohol-based film in an aqueous solution containing a metal salt. borrow The polyvinyl alcohol-based film contains various metal ions by treatment with metal ions.
作為金屬離子，特別是從色調調整和賦予耐久性賦予而言，能夠適合使用鈷、鎳、鋅、鉻、鋁、銅、錳、鐵等過渡金屬的金屬離子。該等金屬離子之中，從色調調整和賦予耐熱性賦予等而言，以鋅離子為佳。作為鋅鹽，可舉出氯化鋅、碘化鋅等的鹵化鋅、硫酸鋅、酢酸鋅等。 As the metal ion, in particular, from the color tone adjustment and the durability imparting, a metal ion of a transition metal such as cobalt, nickel, zinc, chromium, aluminum, copper, manganese or iron can be suitably used. Among these metal ions, zinc ions are preferred from the viewpoint of color tone adjustment and heat resistance imparting. Examples of the zinc salt include zinc halide such as zinc chloride or zinc iodide, zinc sulfate, and zinc antimonate.
金屬離子處理係使用金屬鹽溶液。以下，金屬離子處理之中，針對鋅含浸處理進行說明，作為使用鋅鹽水溶液時的代表例。 The metal ion treatment uses a metal salt solution. In the following, in the metal ion treatment, the zinc impregnation treatment will be described as a representative example when a zinc salt aqueous solution is used.
鋅鹽水溶液中之鋅離子的濃度係0.1~10重量%左右，較佳是0.3~7重量%的範圍。又，因為容易使其含有鋅離子，鋅鹽溶液係以使用藉由碘化鉀等使其含有鉀離子及碘離子之水溶液為佳。鋅鹽溶液中的碘化鉀濃度係0.1~10重量%左右，以0.2~5重量%為更佳。 The concentration of zinc ions in the aqueous zinc salt solution is about 0.1 to 10% by weight, preferably 0.3 to 7% by weight. Further, since it is easy to contain zinc ions, it is preferred to use an aqueous solution containing potassium ions and iodide ions by potassium iodide or the like in the zinc salt solution. The concentration of potassium iodide in the zinc salt solution is about 0.1 to 10% by weight, more preferably 0.2 to 5% by weight.
在鋅含浸處理時，鋅鹽溶液的溫度係通常為15~85℃左右，較佳是25~70℃。浸漬時間係通常為1~120秒左右，較佳是3~90秒鐘的範圍。在鋅含浸處理時，藉由調整鋅鹽溶液的濃度、聚乙烯醇系薄膜在鋅鹽溶液的浸漬溫度、浸漬時間等的條件而將在聚乙烯醇系薄膜之鋅含量調整為前述範圍。鋅含浸處理的階段係沒有特別限制。又，亦可以在染色浴、交聯浴中使鋅鹽共存而與染色步驟、交聯步驟同時進行。 In the zinc impregnation treatment, the temperature of the zinc salt solution is usually about 15 to 85 ° C, preferably 25 to 70 ° C. The immersion time is usually about 1 to 120 seconds, preferably 3 to 90 seconds. In the zinc impregnation treatment, the zinc content of the polyvinyl alcohol-based film is adjusted to the above range by adjusting the concentration of the zinc salt solution, the immersion temperature of the polyvinyl alcohol-based film in the zinc salt solution, and the immersion time. The stage of the zinc impregnation treatment is not particularly limited. Further, the zinc salt may be allowed to coexist in the dyeing bath or the crosslinking bath, and may be carried out simultaneously with the dyeing step and the crosslinking step.
洗淨步驟係能夠使用水或含有碘化物的水溶液(處理液)來進行。作為在前述含有碘化物的水溶液之碘化 物，係能夠使用前述者，其中，例如以碘化鉀、碘化鈉等為佳。藉由洗淨步驟，能夠將在前述交聯步所使用之殘留的硼酸從聚乙烯醇系薄膜沖洗。前述水溶液係碘化鉀水溶液的情況，其濃度係例如以0.5~20重量%的範圍內為佳，以1~15重量%的範圍內為較佳，以1.5~7重量%的範圍內更佳。 The washing step can be carried out using water or an aqueous solution (treatment liquid) containing an iodide. Iodination as an aqueous solution containing the above iodide The above may be used, and for example, potassium iodide, sodium iodide or the like is preferred. The residual boric acid used in the crosslinking step described above can be washed from the polyvinyl alcohol-based film by the washing step. In the case where the aqueous solution is a potassium iodide aqueous solution, the concentration thereof is preferably in the range of 0.5 to 20% by weight, preferably in the range of 1 to 15% by weight, more preferably in the range of 1.5 to 7% by weight.
前述含有碘化物的水溶液的溫度係沒有特別限定，通常係以15~40℃的範圍內為佳，以20~35℃的範圍內為較佳。又，與聚乙烯醇系薄膜的接觸時間係沒有特別限定，通常係以2~30秒的範圍內為佳，以3~20秒的範圍內為較佳。 The temperature of the aqueous solution containing the iodide is not particularly limited, but is preferably in the range of 15 to 40 ° C, and preferably in the range of 20 to 35 ° C. Further, the contact time with the polyvinyl alcohol-based film is not particularly limited, but is preferably in the range of 2 to 30 seconds, and preferably in the range of 3 to 20 seconds.
施行前述各步驟之後，係在最後施行乾燥步驟而製造偏光件。作為前述乾燥步驟，能夠使用自然乾燥、風乾、加熱乾燥等適當的方法，通常，能夠適合使用加熱乾燥。進行加熱乾燥時，加熱溫度係沒有特別限定，通常係以25~80℃的範圍內為佳，以30~70℃的範圍內為較佳，以30~60℃的範圍內為更佳。又，乾燥時間係以1~10分鐘左右為佳。 After performing the foregoing steps, the polarizing member is manufactured by performing a drying step at the end. As the drying step, an appropriate method such as natural drying, air drying, or heat drying can be used, and usually, heat drying can be suitably employed. The heating temperature is not particularly limited, and is usually in the range of 25 to 80 ° C, preferably in the range of 30 to 70 ° C, and more preferably in the range of 30 to 60 ° C. Moreover, the drying time is preferably about 1 to 10 minutes.
施行洗淨步驟(施行乾燥步驟後，偏光件的硼酸含量亦沒有變化)之後，從光學耐久性的觀點，聚乙烯醇系薄膜(偏光件)中的硼酸含量係以15~30重量%為佳，以18重量%以上為更佳，以20重量%以上為又更佳。另一方面，前述硼酸含量太多時，因為在加熱環境下之尺寸變化係變大，有引起面板產生翹曲之可能性，前述硼酸含量係以30 重量%以下為佳，以27重量%以下為更佳。 After the washing step (the boric acid content of the polarizing member is not changed after the drying step), the boric acid content in the polyvinyl alcohol-based film (polarizing member) is preferably 15 to 30% by weight from the viewpoint of optical durability. More preferably, it is 18% by weight or more, and more preferably 20% by weight or more. On the other hand, when the boric acid content is too large, since the dimensional change in the heating environment is large, there is a possibility that the panel is warped, and the boric acid content is 30. The weight% or less is preferably at most, and it is preferably 27% by weight or less.
所得到的偏光件，係能夠依照常用的方法而作為在其至少一面設置透明保護薄膜而成之偏光板。作為構成透明保護薄膜之材料，例如能夠使用透明性、機械強度、熱安定性、水分隔離性、各向同性等優良的熱可塑性樹脂。作為此種熱可塑性樹脂的具體例，可舉出三乙酸纖維素等的纖維素樹脂、聚酯樹脂、聚醚碸樹脂、聚碸樹脂、聚碳酸酯樹脂、聚醯胺樹脂、聚醯亞胺樹脂、聚烯烴樹脂、(甲基)丙烯酸樹脂、環狀聚烯烴樹脂(降莰烯系樹脂)、聚芳香酯樹脂、聚苯乙烯樹脂、聚乙烯醇樹脂、及該等的混合物。又，在偏光件的一側，係使用接著劑層貼合透明保護薄膜，在另外一側係能夠使用(甲基)丙烯酸系、胺甲酸酯系、丙烯酸胺甲酸酯系、環氧系、矽酮系等的熱硬化性樹脂或紫外線硬化型樹脂作為透明保護薄膜。 The obtained polarizing member can be a polarizing plate in which a transparent protective film is provided on at least one surface thereof in accordance with a usual method. As the material constituting the transparent protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, and the like can be used. Specific examples of such a thermoplastic resin include cellulose resins such as cellulose triacetate, polyester resins, polyether oxime resins, polyfluorene resins, polycarbonate resins, polyamide resins, and polyimine. A resin, a polyolefin resin, a (meth)acrylic resin, a cyclic polyolefin resin (northene-based resin), a polyarylate resin, a polystyrene resin, a polyvinyl alcohol resin, and a mixture thereof. Further, on one side of the polarizer, a transparent protective film is bonded using an adhesive layer, and on the other side, a (meth)acrylic, urethane-based, urethane-based or epoxy-based system can be used. A thermosetting resin such as an anthrone or an ultraviolet curable resin is used as a transparent protective film.
透明保護薄膜的厚度係能夠適當地決定，從強度和操作性等的作業性、薄層性等而言，通常係1~500μm左右。特別是以1~300μm為佳，以5~200μm為較佳。透明保護薄膜係以5~150μm時為特佳。 The thickness of the transparent protective film can be appropriately determined, and it is usually about 1 to 500 μm from the viewpoints of workability and thinness such as strength and workability. In particular, it is preferably 1 to 300 μm, more preferably 5 to 200 μm. The transparent protective film is particularly excellent at 5 to 150 μm.
又，在偏光件的兩側設置透明保護薄膜時，可以在其表背使用由相同聚合物材料所構成之保護薄膜，亦可以使用由不同聚合物材料等所構成之保護薄膜。 Further, when a transparent protective film is provided on both sides of the polarizer, a protective film made of the same polymer material may be used on the front and back sides, and a protective film made of a different polymer material or the like may be used.
前述透明保護薄膜亦可以在塗布接著劑之前，進行表面改質處理。具體的處理係可舉出電暈處理、電漿處理、底漆處理、皂化處理等。 The transparent protective film may also be subjected to surface modification treatment before the application of the adhesive. Specific treatments include corona treatment, plasma treatment, primer treatment, saponification treatment and the like.
在前述透明保護薄膜之未接著偏光件的面，亦可以是經施行以硬塗處理、防止反射處理、以防止黏附、擴散或抗眩作為目的之處理者。 The surface of the transparent protective film which is not attached to the polarizing member may be a processor which is subjected to a hard coating treatment, a reflection preventing treatment, and a purpose of preventing adhesion, diffusion, or anti-glare.
前述偏光件與透明保護薄膜的接著處理，係能夠使用接著劑。作為接著劑，能夠例示異氰酸酯系接著劑、聚乙烯醇系接著劑、明膠系接著劑、乙烯系乳液系、水系聚酯等。前述接著劑係通常以由水溶液所構成的接著劑之方式被使用，通常含有0.5~60重量%的固形分而成。上述以外，作為偏光件與透明保護薄膜的接著劑，可舉出紫外硬化型接著劑、電子線硬化型接著劑等。電子線硬化型偏光板用接著劑係對上述各種的透明保護薄膜顯示適合的接著性。特別是對於難以滿足接著性之丙烯酸樹脂亦顯示良好的接著性。又，在本發明所使用之接著劑係能夠使其含有金屬化合物填料。 The adhesive treatment of the polarizer and the transparent protective film can be carried out using an adhesive. Examples of the adhesive agent include an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, an ethylene-based emulsion, and an aqueous polyester. The above-mentioned adhesive is usually used in the form of an adhesive composed of an aqueous solution, and usually contains 0.5 to 60% by weight of a solid component. In addition to the above, examples of the adhesive of the polarizer and the transparent protective film include an ultraviolet curable adhesive, an electron beam curable adhesive, and the like. The adhesive for an electron beam curing type polarizing plate exhibits suitable adhesion to the above various transparent protective films. In particular, an acrylic resin which is difficult to satisfy the adhesion property also exhibits good adhesion. Further, the adhesive used in the present invention can contain a metal compound filler.
本發明的偏光板係藉由使用前述接著劑將前述透明保護薄膜與偏光件貼合來製造。接著劑的塗布係可以在透明保護薄膜、偏光件的任一者進行，亦可以在兩者進行。貼合後係施行乾燥步驟而形成由塗布乾燥層所構成之接著層。偏光件與透明保護薄膜的貼合係能夠藉由輥貼合機等來進行。接著層的厚度係沒有特別限制，通常為30~1000nm左右。 The polarizing plate of the present invention is produced by laminating the transparent protective film and a polarizing member using the above-mentioned adhesive. The coating of the subsequent agent may be carried out in either the transparent protective film or the polarizing member, or both. After lamination, a drying step is performed to form an adhesive layer composed of a coated dry layer. The bonding of the polarizer and the transparent protective film can be performed by a roll bonding machine or the like. The thickness of the layer is not particularly limited and is usually about 30 to 1000 nm.
本發明的偏光板係在實際使用時，能夠以與其他光學層積層而成的光學薄膜之方式使用。針對其光學層係沒有特別限定，例如能夠使用1層或2層以上之形成反射 板、平透射板、相位差板(包含1/2和1/4等的波長板)、視角補償薄膜等的液晶顯示裝置等所使用之光學層。特別是以在本發明的偏光板進一步積層反射板或半透射反射板而成之反射型偏光板或半透射型偏光板；在偏光板進一步積層相位差板而成之橢圓偏光板或圓偏光板；在偏光板進一步積層視角補償薄膜而成之廣視野角偏光板；或是在偏光板進一步積層亮度提升薄膜而成之偏光板為佳。 The polarizing plate of the present invention can be used as an optical film formed by laminating other optical layers in actual use. The optical layer system is not particularly limited, and for example, one or two or more layers can be used to form a reflection. An optical layer used for a liquid crystal display device such as a plate, a flat transmission plate, a phase difference plate (including a wavelength plate such as 1/2 and 1/4), or a viewing angle compensation film. In particular, a reflective polarizing plate or a semi-transmissive polarizing plate in which a reflecting plate or a semi-transmissive reflecting plate is further laminated on the polarizing plate of the present invention; and an elliptically polarizing plate or a circular polarizing plate in which a phase difference plate is further laminated on the polarizing plate A wide viewing angle polarizing plate which is formed by further accumulating a viewing angle compensation film on a polarizing plate, or a polarizing plate which is further formed by laminating a brightness enhancement film on a polarizing plate.
在偏光板積層有前述光學層之光學薄膜，係能夠在液晶顯示裝置等的製造過程依照順序各別地積層之方式形成，但是預先積層而成為光學薄膜者係具有以下的優點：品質穩定性、組裝作業等優良而能夠提升液晶顯示裝置等的製造步驟。積層係能夠使用黏著層等適當的接著手段。在接著前述的偏光板和其他光學薄膜時，其等的光學軸係能夠按照目標相位差特性等而設為適當的配置角度。 The optical film in which the optical layer is laminated on the polarizing plate can be formed in a layered manner in the manufacturing process of a liquid crystal display device or the like. However, the optical film is laminated in advance and has the following advantages: quality stability, The assembly process and the like are excellent, and the manufacturing steps of the liquid crystal display device or the like can be improved. The laminate system can use an appropriate bonding means such as an adhesive layer. When the polarizing plate and other optical films described above are followed, the optical axis of the optical plate can be set to an appropriate arrangement angle in accordance with the target phase difference characteristics or the like.
前述的偏光板、積層至少1層偏光板之光學薄膜亦能夠設置用以與液晶胞等的其他構件接著之黏著層。形成黏著層之黏著劑係沒有特別限制，例如能夠適當選擇以丙烯酸系聚合物、矽酮系聚合物、聚酯、聚胺甲酸酯、聚醯胺、聚醚、氟系、橡膠系等的聚合物作為基質聚合物者而使用。特別是能夠適合使用如丙烯酸系黏著劑之光學透明性優良且顯示適當的濕潤性、凝集性及接著性之黏著特性且耐候性、耐熱性等優良者。 The polarizing plate and the optical film in which at least one polarizing plate is laminated may be provided with an adhesive layer for adhering to other members such as liquid crystal cells. The adhesive to form the adhesive layer is not particularly limited, and for example, an acrylic polymer, an anthrone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine, a rubber, or the like can be appropriately selected. The polymer is used as a matrix polymer. In particular, it is possible to suitably use, for example, an acrylic pressure-sensitive adhesive which is excellent in optical transparency and exhibits appropriate wettability, cohesiveness, and adhesion properties, and is excellent in weather resistance and heat resistance.
在偏光板、光學薄膜的一面或兩面附設黏著層，係能夠以適當的方式進行。作為其例子，例如可舉出調製 使基質聚合物或其組成物溶解或分散在由甲苯、乙酸乙酯等的適當溶劑的單獨物或混合物所構成的溶劑而成之10~40重量%左右的黏著劑溶液，將其以流涎方式、塗布方式等適當的展開方式直接附設於偏光板上或光學薄膜上之方式；或是按照前述在分離件上形成黏著層且將其移轉至偏光板上或光學薄膜上之方式等。 The adhesive layer may be attached to one surface or both surfaces of the polarizing plate or the optical film in an appropriate manner. As an example thereof, for example, modulation can be cited. An adhesive solution obtained by dissolving or dispersing a matrix polymer or a composition thereof in a solvent composed of a single substance or a mixture of a suitable solvent such as toluene or ethyl acetate to form a binder solution of about 10 to 40% by weight. And a suitable manner of unfolding, such as a coating method, directly attached to the polarizing plate or the optical film; or a method of forming an adhesive layer on the separating member and transferring it to the polarizing plate or the optical film as described above.
黏著層係亦能夠以不同組成或種類等的重疊層的方式設置在偏光板、光學薄膜的一面或兩面。又，設置在兩面時，係亦能夠以不同組成或種類等的重疊層的方式設置在偏光板、光學薄膜的表背。黏著層的厚度係能夠按照使用目的、接著力等而適當地決定，通常係1~500μm，以5~200μm為佳，以10~100μm為特佳。 The adhesive layer can also be provided on one or both sides of the polarizing plate or the optical film in a manner of overlapping layers of different compositions or types. Further, when it is provided on both sides, it can be provided on the front and back of the polarizing plate or the optical film so as to have overlapping layers of different compositions or types. The thickness of the adhesive layer can be appropriately determined depending on the purpose of use, the adhesion, and the like, and is usually 1 to 500 μm, preferably 5 to 200 μm, and particularly preferably 10 to 100 μm.
對於黏著層的露出面，係在至提供實際使用之期間，為了防止其汚染等之目的而暫時黏附且覆蓋分離件。藉此，能夠防止在通例的操作狀態接觸黏著層。作為分離件，係除了上途的上述厚度條件以外，例如能夠使用將塑膠薄膜、橡膠薄片、紙、布、不織布、網狀物、發泡薄片、金屬箔、其等的積層體等適當的薄片物，按照必要使用矽酮系、長鏈烷基系、氟系、硫化鉬等適當的剝離劑塗布處理而成者等依照先前之適當的分離件。 The exposed surface of the adhesive layer is temporarily adhered to and covered with the separator for the purpose of preventing contamination or the like during the period of providing actual use. Thereby, it is possible to prevent the adhesive layer from coming into contact with the operation state of the general example. As the separator, in addition to the above thickness conditions in the past, for example, a suitable sheet such as a plastic film, a rubber sheet, a paper, a cloth, a nonwoven fabric, a mesh, a foamed sheet, a metal foil, or the like can be used. The material is subjected to a suitable release agent such as an anthrone-based, a long-chain alkyl group, a fluorine-based or a molybdenum sulfide, as necessary, and the like.
又，在本發明，在形成上述的偏光板之偏光件、透明保護薄膜、光學薄膜等、以及在黏著層等的各層，亦可以藉由使用例如柳酸酯系化合物、二苯基酮系化合物、苯并***系化合物、氰基丙烯酸酯系化合物、鎳錯鹽系化 合物等的紫外線吸收劑進行處理之方式等的方式使其成為具有紫外線吸收能力者等。 Further, in the present invention, in the polarizing plate, the transparent protective film, the optical film, and the like which form the above-mentioned polarizing plate, and the respective layers such as the adhesive layer, for example, a salicylate-based compound or a diphenylketone-based compound may be used. , benzotriazole-based compound, cyanoacrylate-based compound, nickel-salted salt system A method in which the ultraviolet absorber such as a compound is treated, or the like, is used as a person having ultraviolet absorbing ability.
本發明的偏光板或光學薄膜係能夠適合使用於形成液晶顯示裝置等的各種裝置等。形成液晶顯示裝置係能夠按照先前而進行。亦即液晶顯示裝置係通常藉由將液晶胞及偏光板或光學薄膜、及按照必要之照明系統等的構成零件適當地組裝且組入驅動回路等等來形成，在本發明，係除了使用本發明之偏光板或光學薄膜這點以外，沒有特別是限定，能夠依照先前。例如作為前述的液晶胞係沒有特別限制，例如能夠應用TN型、STN型、π型、VA型、IPS型等的任意型者。 The polarizing plate or the optical film of the present invention can be suitably used for various devices and the like for forming a liquid crystal display device or the like. The formation of the liquid crystal display device can be performed as before. In other words, the liquid crystal display device is usually formed by appropriately assembling a liquid crystal cell, a polarizing plate or an optical film, and constituent components such as a necessary illumination system, and assembling the driving circuit, etc., in addition to the use of the present invention. The polarizing plate or the optical film of the invention is not particularly limited, and can be used in accordance with the prior art. For example, the liquid crystal cell system is not particularly limited, and for example, any type such as TN type, STN type, π type, VA type, or IPS type can be applied.
能夠形成在液晶胞的一側或兩側配置有偏光板或光學薄膜之液晶顯示裝置、或是在照明系統使用背光板或反射板者等適當的液晶顯示裝置。此時，本發明之偏光板或光學薄膜係能夠設置在液晶胞的一側或兩側。將偏光板或光學薄膜設置在兩側時，其等係可以相同，亦可以不同。而且，在形成液晶顯示裝置時，例如能夠在適當的位置配置1層或2層以上之擴散板、抗眩層、防止反射膜、保護板、稜鏡陣列、透鏡陣列、光擴散板、背光板等適當的零件。 A liquid crystal display device in which a polarizing plate or an optical film is disposed on one side or both sides of a liquid crystal cell, or a liquid crystal display device in which a backlight or a reflector is used in an illumination system can be formed. At this time, the polarizing plate or the optical film of the present invention can be disposed on one side or both sides of the liquid crystal cell. When the polarizing plate or the optical film is disposed on both sides, the lines may be the same or different. Further, when forming a liquid crystal display device, for example, one or two or more diffusion plates, an anti-glare layer, an anti-reflection film, a protective plate, a tantalum array, a lens array, a light diffusing plate, and a backlight can be disposed at appropriate positions. Wait for the appropriate parts.
以下，舉出實施例及比較例而具體地說明本發明。 Hereinafter, the present invention will be specifically described by way of examples and comparative examples.
作為坯膜，係使用厚度為60μm的聚乙烯醇薄膜(平均聚合度2400，KURARAY(股)製VF-PE-A #6000)。對該聚乙烯醇薄膜，依照下述的順序施行下述各步驟。 As the green film, a polyvinyl alcohol film having a thickness of 60 μm (average polymerization degree 2400, VF-PE-A #6000 manufactured by KURARAY Co., Ltd.) was used. The following steps were carried out on the polyvinyl alcohol film in the following order.
(膨潤步驟) (swelling step)
藉由如圖1所表示的態樣之2個膨潤浴而施行膨潤步驟。作為各膨潤浴的處理液，係使用純水。作為在圖1之第1階段的膨潤浴所配置之導輥R13，係使用曲率半徑為20000mm的擴展輥。該擴展輥係配置於聚乙烯醇薄膜浸漬於處理液的長度(在圖1之p1與p2的虛線長度)的80%之位置。又，其他導輥係使用平滑輥。 The swelling step is carried out by means of two swelling baths as shown in Fig. 1. As the treatment liquid of each swelling bath, pure water is used. As the guide roller R13 disposed in the swell bath of the first stage of Fig. 1, an expansion roll having a radius of curvature of 20,000 mm was used. The expanded roll was placed at a position where the polyvinyl alcohol film was immersed in the length of the treatment liquid (the length of the dotted line of p1 and p2 in Fig. 1) at 80%. Moreover, the other guide rolls used a smooth roll.
<第1階段> <Phase 1>
將上述聚乙烯醇薄膜搬運至第1階段的膨潤浴，於經調整為40℃的純水中浸漬60秒鐘且邊使其膨潤、邊單軸延伸至延伸倍率1.80倍。 The polyvinyl alcohol film was transferred to a first-stage swelling bath, and immersed in pure water adjusted to 40° C. for 60 seconds, and swelled to a stretching ratio of 1.80 times.
<第2階段> <Phase 2>
接著，將經施行上述第1階段的膨潤步驟之聚乙烯醇薄膜，搬運至第2階段的膨潤浴，於經調整為30℃之純水中浸漬60秒且邊使其膨潤、邊單軸延伸至延伸倍率1.10(總延伸倍率1.98)。 Next, the polyvinyl alcohol film subjected to the swelling step of the first stage described above was transferred to the second stage swell bath, and immersed in pure water adjusted to 30 ° C for 60 seconds while being swelled and uniaxially stretched. To the stretching ratio of 1.10 (total stretching ratio of 1.98).
(染色步驟) (staining step)
作為染色浴的處理液，係使用碘：碘化鉀(重量比=0.5：8)之濃度0.3重量%的碘染色溶液。將經上述膨潤處理之聚乙烯醇薄膜搬運至染色浴，於經調整為30℃之前述碘染色溶液邊浸漬60秒鐘、邊單軸延伸至相對於原來長度，總延 伸倍率為3倍、邊進行染色。 As the treatment liquid of the dyeing bath, an iodine dyeing solution having a concentration of 0.3% by weight of iodine:potassium iodide (weight ratio = 0.5:8) was used. The swelled polyvinyl alcohol film is transferred to a dyeing bath, and immersed for 60 seconds in the iodine dyeing solution adjusted to 30 ° C, and uniaxially stretched to the original length, and the total length is extended. The magnification was 3 times and the dyeing was performed.
(交聯步驟) (cross-linking step)
作為交聯浴的處理液，係使用含有3重量%硼酸、3重量%碘化鉀之硼酸水溶液。將經上述處理之聚乙烯醇薄膜搬運至交聯俗，於經調整為30℃之前述硼酸水溶液，邊浸漬19秒鐘、邊單軸延伸至相對於原來長度之總延伸倍率4倍。 As the treatment liquid of the crosslinking bath, an aqueous boric acid solution containing 3% by weight of boric acid and 3% by weight of potassium iodide was used. The polyvinyl alcohol film subjected to the above treatment was transferred to a cross-linking, and the boring was carried out for 19 seconds while being immersed for 19 seconds while being immersed for 19 seconds, and the total stretching ratio was 4 times with respect to the original length.
(延伸步驟) (extension step)
作為延伸浴處理液，係使用含有4重量%硼酸、5重量%碘化鉀之硼酸水溶液。將經上述處理之聚乙烯醇薄膜搬運至延伸俗，且在經調整為60℃之硼酸水溶液，邊浸漬13秒鐘、邊單軸延伸至相對於原來長度為總延伸倍率6倍。 As the stretching bath treatment liquid, an aqueous boric acid solution containing 4% by weight of boric acid and 5% by weight of potassium iodide was used. The polyvinyl alcohol film subjected to the above treatment was transferred to a stretch, and immersed for 13 seconds while being immersed in an aqueous boric acid solution adjusted to 60 ° C for uniaxial stretching to a total stretching ratio of 6 times with respect to the original length.
(洗淨步驟) (washing step)
作為洗淨浴的處理液，係使用含有3重量%碘化鉀之水溶液。將經上述處理之聚乙烯醇薄膜搬運至洗淨浴，在經調整為30℃之該水溶液浸漬10秒鐘。 As the treatment liquid for the washing bath, an aqueous solution containing 3% by weight of potassium iodide was used. The polyvinyl alcohol film subjected to the above treatment was transferred to a washing bath, and immersed in the aqueous solution adjusted to 30 ° C for 10 seconds.
(乾燥步驟) (drying step)
其次，將經上述處理之聚乙烯醇系薄膜，在60℃的烘箱乾燥4分鐘而得到偏光件。 Next, the polyvinyl alcohol-based film treated as described above was dried in an oven at 60 ° C for 4 minutes to obtain a polarizing member.
(製造偏光板) (Manufacture of polarizing plates)
在上述所得到之偏光件的兩面，透過由5重量%的完全皂型聚乙烯醇水溶液所構成的接著劑而積層積層經施行厚度80μm的皂化處理之三乙酸纖維素薄膜，藉由壓延輥使其密著之後，於70℃使其乾燥4分鐘而製造偏光板。 On both sides of the polarizing member obtained above, a saponified cellulose triacetate film having a thickness of 80 μm was laminated through an adhesive composed of a 5% by weight aqueous solution of a completely soap-type polyvinyl alcohol, and was passed through a calender roll. After the adhesion, it was dried at 70 ° C for 4 minutes to prepare a polarizing plate.
實施例2~14、比較例1~12 Examples 2 to 14 and Comparative Examples 1 to 12
在實施例1，除了在膨潤步驟之條件係如表1所表示變化以外，係使用與實施例1相同條件製造偏光件。又，使用所得到的偏光件且與實施例1同樣地進行而製造偏光板。又，比較例8係因為在膨潤步驟，薄膜溶出而進行接續膨潤步驟之步驟。比較例9係未設定在圖1之第1階段的膨潤浴所設置的導輥R13之情況。比較例10係未設置第2階段的膨潤浴之情況。 In Example 1, a polarizing member was produced under the same conditions as in Example 1 except that the conditions of the swelling step were changed as shown in Table 1. Further, a polarizing plate was produced in the same manner as in Example 1 using the obtained polarizer. Further, Comparative Example 8 is a step of performing a subsequent swelling step because the film is eluted in the swelling step. Comparative Example 9 is a case where the guide roller R13 provided in the swelling bath of the first stage of Fig. 1 was not provided. In Comparative Example 10, the second stage swelling bath was not provided.
<評價> <evaluation>
針對所得到的偏光件及偏光板，進行下述評價。將結果顯示在表1。 The following evaluation was performed about the obtained polarizer and polarizing plate. The results are shown in Table 1.
(顏色不均) (uneven color)
從垂線方向離開50mm的狀態下，目視觀察偏光板之顏色不均的狀態且使用下述的基準進行評價。 The state of the color unevenness of the polarizing plate was visually observed in a state of being separated from the vertical direction by 50 mm, and evaluated using the following criteria.
○：能夠看到不均。 ○: Unevenness can be seen.
×：無法看到不均。 ×: Unevenness cannot be seen.
(折疊) (fold)
在膨潤步驟，使用下述的基準進行評價薄膜搬運時的狀態。 In the swelling step, the state at the time of film transportation was evaluated using the following criteria.
○：不折疊。 ○: Do not fold.
×：折疊。 ×: Folded.
(單體透射率、偏光度) (single transmittance, polarization)
偏光板的單體透射率(Ts)、偏光度(P)係使用附有積分球的分光光度計(日本分光股份公司製的V-7100)進行測定。 The single transmittance (Ts) and the degree of polarization (P) of the polarizing plate were measured using a spectrophotometer (V-7100, manufactured by JASCO Corporation) equipped with an integrating sphere.
又，偏光度係藉由將2片相同偏光件以兩者的透射軸為平行的方式疊合時的透射率(平行透射率：Tp)、及兩者的透射軸為正交的方式疊合時的透射率(正交透射率：Tc)，應用以下的式求取者。 Further, the degree of polarization is superimposed on the two layers of the same polarizer in such a manner that the transmission axes (parallel transmittance: Tp) when the transmission axes of the two are superposed in parallel, and the transmission axes of the two are orthogonal to each other. The transmittance at the time (orthogonal transmittance: Tc) is obtained by applying the following formula.
偏光度P(%)={(Tp-Tc)/(Tp+Tc)}1/2×100 Polarization P(%)={(Tp-Tc)/(Tp+Tc)} 1/2 ×100
各透射率係將通過格藍-泰勒稜鏡(Glan-Tayler Prism)偏光件而得到的完全偏光設作100%，且以藉由JIS Z8701的2度視野(C光源)進行視感度修正後的Y值表示者。測定波長係波長550nm。 Each of the transmittances is 100% of the total polarized light obtained by the Glan-Tayler Prism polarizer, and the opacity is corrected by the 2 degree field of view (C light source) of JIS Z8701. The Y value is represented. The wavelength of the measurement system was 550 nm.
將偏光板的單體透射率為43.0%且偏光度為99.995%以上時評價為「○」，將此外的情況評價為「×」。 When the single transmittance of the polarizing plate was 43.0% and the degree of polarization was 99.995% or more, it was evaluated as "○", and the other case was evaluated as "x".
L‧‧‧聚乙烯醇系薄膜的長度(虛線) Length of L‧‧‧ polyvinyl alcohol film (dashed line)
R11~R14‧‧‧導輥 R11~R14‧‧·guide roller
R21~R24‧‧‧導輥 R21~R24‧‧·guide roller
p1‧‧‧薄膜的浸漬開始位置 P1‧‧‧ film impregnation start position
p2‧‧‧薄膜的浸漬結束位置 P2‧‧‧ film immersion end position
X(X1、X2)‧‧‧處理液 X (X1, X2) ‧ ‧ treatment solution
Y(Y1、Y2)‧‧‧處理浴 Y (Y1, Y2) ‧ ‧ treatment bath
S1‧‧‧第1階段 S1‧‧‧ Phase 1
S2‧‧‧第2階段 S2‧‧‧ Phase 2
W‧‧‧聚乙烯醇系薄膜 W‧‧‧ polyvinyl alcohol film
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| JP2012182453A JP5991883B2 (en) | 2011-12-06 | 2012-08-21 | Method for producing polarizer and method for producing polarizing plate |
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| JP6666063B2 (en) * | 2014-07-15 | 2020-03-13 | 住友化学株式会社 | Manufacturing method of polarizing film |
| JP6067158B1 (en) * | 2015-07-27 | 2017-01-25 | 住友化学株式会社 | Manufacturing method of polarizing film |
| CN108603974B (en) * | 2016-02-09 | 2024-01-16 | 株式会社可乐丽 | Polarizing film and method for producing same |
| JP6235677B2 (en) * | 2016-03-28 | 2017-11-22 | 住友化学株式会社 | Manufacturing method of polarizing film |
| JP6359048B2 (en) * | 2016-03-31 | 2018-07-18 | 住友化学株式会社 | Manufacturing method of polarizing film |
| WO2018164176A1 (en) | 2017-03-08 | 2018-09-13 | 株式会社クラレ | Polarizing film, polarizing plate, and method for manufacturing same |
| JP7199343B2 (en) | 2017-03-08 | 2023-01-05 | 株式会社クラレ | Polarizing film, polarizing plate, and manufacturing method thereof |
| JPWO2021044916A1 (en) * | 2019-09-05 | 2021-03-11 |
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| JP4198559B2 (en) * | 2002-08-02 | 2008-12-17 | 日東電工株式会社 | Method for producing polarizing film, and polarizing film and optical film using the same |
| JP5350368B2 (en) * | 2008-12-18 | 2013-11-27 | 株式会社クラレ | Manufacturing method of polarizing film |
| JP2011203641A (en) * | 2010-03-26 | 2011-10-13 | Sumitomo Chemical Co Ltd | Polarizing plate |
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| TW200403488A (en) * | 2002-08-08 | 2004-03-01 | Nitto Denko Corp | Method for manufacturing polarizer, polarizer, polarizing plate, and image display |
| TW200528779A (en) * | 2004-02-16 | 2005-09-01 | Sumitomo Chemical Co | A method for producing a polarizing film, a polarizer and an optical laminate |
| JP2006065309A (en) * | 2004-07-28 | 2006-03-09 | Nitto Denko Corp | Method for manufacturing polarizing film, polarizing film, polarizing plate, optical film and image display device |
| JP2007226035A (en) * | 2006-02-24 | 2007-09-06 | Nitto Denko Corp | Method for manufacturing polarizer, polarizer, polarizing plate, optical film, image display device and cleaning device |
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| JP2009104062A (en) * | 2007-10-25 | 2009-05-14 | Sumitomo Chemical Co Ltd | Polarizing film, its manufacturing method and polarizing plate |
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| JP5991883B2 (en) | 2016-09-14 |
| TW201329538A (en) | 2013-07-16 |
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