TWI541569B - Apparatus and method for manufacturing polarizing plate - Google Patents
Apparatus and method for manufacturing polarizing plate Download PDFInfo
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Description
本發明係關於液晶顯示裝置或影像顯示裝置等所使用之偏光板的製造裝置及製造方法、與藉由該製造方法所得之偏光板及光學積層體。The present invention relates to a manufacturing apparatus and a manufacturing method of a polarizing plate used in a liquid crystal display device, an image display device, and the like, and a polarizing plate and an optical layered body obtained by the manufacturing method.
一般而言，偏光板係將保護膜貼合在偏光膜的一面或雙面而形成。以保護膜而言，可使用具有相位差膜、亮度提升膜、視角改善膜及半穿透反射膜中任一種功能的膜。In general, a polarizing plate is formed by bonding a protective film to one side or both sides of a polarizing film. As the protective film, a film having any one of a retardation film, a brightness enhancement film, a viewing angle improvement film, and a semi-transmissive reflection film can be used.
可是，液晶顯示裝置等中的光學膜之光軸方向(亦即，偏光膜的吸收軸方向與相位差膜的遲相軸方向)係對所欲形成之液晶顯示裝置等的顯示功能有很大影響。因此，係以光軸方向成為適合所欲形成之液晶顯示裝置等的方式切出光學膜。而且，所切出的片狀膜係以光軸成為預定角度的方式貼合於連續膜。例如在專利文獻1中係揭示有：在捲筒狀的聚乙烯醇系偏光膜之單面使用水性接著劑貼合保護膜或相位差膜的偏光板製造方法。However, the optical axis direction of the optical film in the liquid crystal display device or the like (that is, the absorption axis direction of the polarizing film and the slow axis direction of the retardation film) is large for the display function of the liquid crystal display device or the like to be formed. influences. Therefore, the optical film is cut out so that the optical axis direction becomes suitable for the liquid crystal display device or the like to be formed. Further, the cut sheet film is bonded to the continuous film so that the optical axis becomes a predetermined angle. For example, Patent Document 1 discloses a method of producing a polarizing plate in which a protective film or a retardation film is bonded to one surface of a roll-shaped polyvinyl alcohol-based polarizing film using an aqueous adhesive.
專利文獻1：日本特開2007-193333號公報Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-193333
然而，在以專利文獻1揭示的方法所獲得的偏光板中係有：當反覆進行加熱與冷卻之耐熱促進試驗(所謂之熱循環(heat cycle)試驗)、或長時間高溫環境下之耐熱試驗時，端部會突起、膜的貼合面會產生氣泡、或在貼合面會產生捲曲的情形。更且，在專利文獻1記載的偏光板之製造方法中，需要用以使水性接著劑乾燥的乾燥機，因此有裝置大型化、且成本增加之問題。However, in the polarizing plate obtained by the method disclosed in Patent Document 1, there is a heat resistance promoting test (so-called heat cycle test) in which heating and cooling are repeatedly performed, or a heat resistance test in a long-time high temperature environment. At the time, the end portion may protrude, and the bonding surface of the film may generate air bubbles or may be curled on the bonding surface. Further, in the method for producing a polarizing plate described in Patent Document 1, a dryer for drying an aqueous adhesive is required, and therefore, the device is increased in size and cost is increased.
本發明之主要目的係在於提供一種偏光板之製造裝置以及使用其製造偏光板的方法，該裝置不會大型化，且可提升生產效率。再者，本發明之另一目的係在於提供一種可抑制薄膜的貼合面端部突起與氣泡的產生、且外觀良好之偏光板。The main object of the present invention is to provide a device for manufacturing a polarizing plate and a method for manufacturing the same using the polarizing plate, which is not large in size and can improve production efficiency. Further, another object of the present invention is to provide a polarizing plate which can suppress the occurrence of protrusions of the bonding surface of the film and the generation of bubbles, and has a good appearance.
本發明人等為了解決上述問題不斷專心致力於研討，結果發現：在連續的捲筒狀膜塗佈紫外線硬化接著劑，再將切割成預定大小的片狀膜以光軸成為預定角度的方式加以貼合後，對貼合面照射紫外線而使紫外線硬化接著劑硬化，藉此(1)由於不需要乾燥機，故裝置不會大型化、且可連續性地有效率製造偏光板；(2)更且，可獲得能夠抑制耐熱促進試驗與耐熱試驗中之在膜之貼合面端部的突起、氣泡的產生、或在貼合面產生捲曲的偏光板，而完成本發明。The inventors of the present invention have been concentrating on the above-mentioned problems, and have found that the ultraviolet curable adhesive is applied to a continuous roll film, and then the sheet film cut into a predetermined size is set so that the optical axis becomes a predetermined angle. After bonding, the bonding surface is irradiated with ultraviolet rays to cure the ultraviolet curing adhesive, whereby (1) since the dryer is not required, the device is not enlarged, and the polarizing plate can be efficiently produced continuously; (2) Further, the present invention can be obtained by suppressing the occurrence of protrusions, bubbles, or curling on the bonding surface at the end of the bonding surface of the film in the heat resistance promoting test and the heat resistance test.
亦即，本發明係與以下之記載相關。That is, the present invention relates to the following description.
(1)一種偏光板的製造裝置，係將一方為捲繞成捲筒狀的連續膜、另一方屬於片狀膜之偏光膜與保護膜予以貼合，其中包含有：拉出捲繞成捲筒狀的連續膜之手段；將紫外線硬化型接著劑塗佈在被拉出的前述連續膜之單面的手段；將片狀膜重疊在前述連續膜的前述接著劑塗佈面之手段；以及用以使前述紫外線硬化型接著劑硬化之紫外線照射手段。(1) A manufacturing apparatus for a polarizing plate, wherein a polarizing film which is wound into a roll shape and a polarizing film which is a sheet-like film and a protective film are bonded together, and the film is formed by: pulling out and winding into a roll a means for applying a tubular continuous film; means for applying an ultraviolet curable adhesive to one side of the continuous film to be drawn; and means for superposing the sheet film on the adhesive coated surface of the continuous film; An ultraviolet irradiation means for curing the ultraviolet curable adhesive.
(2)如(1)項記載的製造裝置，其中，係具有在前述連續膜的前述接著劑塗佈面將片狀膜及覆蓋該等膜之表面保護膜依照此順序予以重疊，同時使前述紫外線硬化型接著劑硬化而接著連續膜與片狀膜後，使前述表面保護膜剝離而分離之手段。(2) The manufacturing apparatus according to the item (1), wherein the sheet-like film and the surface protective film covering the film are overlapped in the order of the adhesive application surface of the continuous film, and the aforementioned After the ultraviolet curable adhesive is cured and then the continuous film and the sheet film are formed, the surface protective film is peeled off and separated.
(3)如(1)或(2)項記載的製造裝置，其中，係構成為：前述片狀膜係被載置在從拉出滾筒朝向捲取滾筒移動的保護膜剝離用黏著帶上，並被搬送到與前述連續膜重疊的位置，且一面從前述片狀膜剝離保護膜，一面將片狀膜重疊在前述連續膜。(3) The manufacturing apparatus according to the item (1) or (2), wherein the sheet-like film is placed on the protective film peeling adhesive tape that moves from the drawing drum toward the winding drum, The film is transferred to the position overlapping the continuous film, and the sheet film is superposed on the continuous film while peeling off the protective film from the sheet film.
(4)一種偏光板的製造方法，係將一方為捲繞成捲筒狀的膜、另一方屬於片狀膜之偏光膜與保護膜予以貼合，其中包含有：一面連續性拉出捲繞成捲筒狀的連續膜一面在該連續膜的單面塗佈紫外線硬化型接著劑，接著將片狀膜重疊在前述連續膜的前述接著劑塗佈面後，照射紫外線以使前述紫外線硬化型接著劑硬化，而將片狀膜積層接著在前述連續膜。(4) A method for producing a polarizing plate, wherein one of the film wound in a roll shape and the other of the polarizing film belonging to the sheet film are bonded to the protective film, and the film is continuously drawn and wound. The continuous film in a roll shape is coated with an ultraviolet curable adhesive on one surface of the continuous film, and then the sheet film is superposed on the adhesive application surface of the continuous film, and then irradiated with ultraviolet rays to make the ultraviolet curing type. The agent is then hardened, and the sheet film is laminated to the continuous film described above.
(5)一種偏光板，係藉由上述(4)記載的製造方法所獲得之至少於單面貼合有保護膜而構成者。(5) A polarizing plate which is obtained by bonding a protective film to at least one side obtained by the production method described in the above (4).
(6)如(5)記載的偏光板，其中，前述保護膜係具有相位差膜、亮度提升膜、視角改善膜及半穿透反射膜中任一種功能者。(6) The polarizing plate according to (5), wherein the protective film has any one of a retardation film, a brightness enhancement film, a viewing angle improvement film, and a semi-transmissive reflection film.
(7)一種光學積層體，係為貼合上述(5)記載的偏光板、及選自相位差膜、亮度提升膜、視角改善膜及半穿透反射膜中至少任一種膜而成者。(7) An optical laminate comprising the polarizing plate according to (5) above, and at least one selected from the group consisting of a retardation film, a brightness enhancement film, a viewing angle improvement film, and a semi-transmissive reflection film.
依據本發明之偏光板的製造方法，可不用使用水或其他溶劑，而使用紫外線硬化型接著劑將連續的捲筒狀膜與片狀膜予以連續且有效率地貼合。更且，不需要使溶劑揮發用的乾燥裝置，因此，不會使整個裝置大型化，而能削減成本。According to the method for producing a polarizing plate of the present invention, the continuous roll film and the sheet film can be continuously and efficiently bonded together using an ultraviolet curable adhesive without using water or another solvent. Further, since there is no need for a drying device for volatilizing the solvent, the entire apparatus can be increased in size, and the cost can be reduced.
本發明之偏光板係可以降低在耐熱促進試驗等之膜貼合面的端部突起、氣泡的產生、及貼合面的產生捲曲。In the polarizing plate of the present invention, it is possible to reduce the occurrence of curling at the end portion of the film bonding surface such as the heat resistance promoting test, the generation of bubbles, and the bonding surface.
第1圖係示有本發明偏光板製造裝置的一實施形態。如該圖所示，該偏光板製造裝置1係具有將捲繞成捲筒狀的偏光膜2連續性拉出的一對拉取滾輪61,62。在偏光膜2的單面係事先貼合有偏光膜2的表面保護用之剝離膜3，於第1滾輪4將剝離膜3分離。而剝離膜3係捲繞成捲筒狀予以回收。Fig. 1 is a view showing an embodiment of a polarizing plate manufacturing apparatus of the present invention. As shown in the figure, the polarizing plate manufacturing apparatus 1 has a pair of drawing rollers 61 and 62 that continuously pull out the polarizing film 2 wound in a roll shape. The release film 3 for surface protection of the polarizing film 2 is bonded to the single surface of the polarizing film 2 in advance, and the release film 3 is separated by the first roller 4. The release film 3 is wound into a roll shape and recovered.
分離剝離膜3後的偏光膜2係被送到塗佈紫外線硬化型接著劑的接著劑塗佈裝置5，利用塗佈滾輪51於偏光膜單面塗佈預定量的紫外線硬化型接著劑，並送往一對的貼合滾輪71,72。The polarizing film 2 after separating the release film 3 is sent to the adhesive application device 5 to which the ultraviolet curable adhesive is applied, and a predetermined amount of the ultraviolet curable adhesive is applied to one surface of the polarizing film by the application roller 51, and A pair of bonding rollers 71, 72 are sent.
另一方面，在貼合滾輪71,72係被搬來切割成預定大小的片狀保護膜8(以下有稱為片狀保護膜8之情形)。在片狀保護膜8之與偏光膜2的貼合面係貼合有未圖示的保護膜。因此在片狀保護膜8與偏光膜2的貼合之前，需要剝離保護膜。所以從捲繞成捲筒狀的拉出滾輪91朝向捲取滾輪92使保護膜剝離用黏著帶9一面連續性地朝片狀保護膜8的搬運方向移動，一面將片狀保護膜8的保護膜面載置並貼合在該黏著帶9上。符號10係表示將一張張的片狀保護膜8予以吸引保持，並依序載置貼合在黏著帶9表面上用的吸盤式搬運裝置。On the other hand, the bonding rollers 71 and 72 are transported and cut into a sheet-like protective film 8 of a predetermined size (hereinafter referred to as a sheet-like protective film 8). A protective film (not shown) is bonded to the bonding surface of the sheet-like protective film 8 and the polarizing film 2. Therefore, it is necessary to peel off the protective film before the sheet-like protective film 8 and the polarizing film 2 are bonded together. Therefore, the protective film peeling adhesive tape 9 is continuously moved in the conveyance direction of the sheet-like protective film 8 from the take-up roller 91 wound in a roll shape toward the take-up roller 92, and the sheet-like protective film 8 is protected. The film surface is placed and attached to the adhesive tape 9. Reference numeral 10 denotes that a sheet-like protective film 8 is sucked and held one by one, and a suction-type conveying device for bonding to the surface of the adhesive tape 9 is placed in order.
貼合在保護膜剝離用黏著帶9的黏著面上之片狀保護膜8係被搬運到與偏光膜2重疊之位置，且一面從前述片狀保護膜8剝離保護膜，一面將片狀保護膜8與偏光膜2重疊。亦即，片狀保護膜8係透過一對貼合滾輪71,72而重疊在偏光膜2的接著劑塗佈面上。在該情形時，保護膜剝離用黏著帶9係在即將到達貼合滾輪71,72之前朝片狀保護膜8移動方向的反方向被折回，而於該折回部使保護膜從片狀保護膜8剝離，所以透過貼合滾輪71,72僅將片狀保護膜8重疊在偏光膜2的接著劑塗佈面上。以保護膜剝離用黏著帶9而言，可使用例如在塑膠膜基材表面設有黏著劑層者等。The sheet-like protective film 8 bonded to the adhesive surface of the protective film peeling adhesive tape 9 is conveyed to a position overlapping the polarizing film 2, and the protective film is peeled off from the sheet-shaped protective film 8, and the sheet-like protection is performed. The film 8 overlaps with the polarizing film 2. That is, the sheet-like protective film 8 is superposed on the adhesive-coated surface of the polarizing film 2 through the pair of bonding rollers 71 and 72. In this case, the protective film peeling adhesive tape 9 is folded back in the opposite direction to the moving direction of the sheet-like protective film 8 immediately before reaching the bonding rollers 71, 72, and the protective film is removed from the sheet-shaped protective film in the folded portion. Since the peeling is performed, the sheet-like protective film 8 is superposed on the adhesive-coated surface of the polarizing film 2 through the bonding rollers 71 and 72. For the protective film peeling adhesive tape 9, for example, an adhesive layer may be provided on the surface of the plastic film substrate.
在貼合滾輪71,72，於偏光膜2與片狀保護膜8上再重疊表面保護膜12。該表面保護膜12係捲繞成捲筒狀的膜，被連續性地拉出，且在貼合滾輪71,72被重疊在偏光板2及片狀保護膜8上。The surface protective film 12 is further laminated on the polarizing film 2 and the sheet-like protective film 8 by bonding the rollers 71, 72. The surface protection film 12 is wound into a roll-shaped film, and is continuously pulled out, and the bonding rollers 71 and 72 are superposed on the polarizing plate 2 and the sheet-like protective film 8.
表面保護膜12係用於防止紫外線硬化型接著劑從偏光膜2及片狀保護膜8溢出而污染到機器。以表面保護膜12而言，較佳為不會對後續的藉由紫外線照射所進行之紫外線硬化型接著劑之硬化造成影響者，例如可列舉透明或半透明之聚乙烯、聚酯類樹脂等塑膠膜。The surface protective film 12 is used to prevent the ultraviolet curable adhesive from overflowing from the polarizing film 2 and the sheet-like protective film 8 and contaminating the machine. The surface protective film 12 is preferably one which does not affect the subsequent curing of the ultraviolet curable adhesive by ultraviolet irradiation, and examples thereof include transparent or translucent polyethylene, polyester resin, and the like. Plastic film.
由貼合滾輪71,72所重疊的片狀保護膜8、偏光膜2及表面保護膜12係透過拉取滾輪61,62而朝向紫外線照射裝置11,11搬運。The sheet-like protective film 8, the polarizing film 2, and the surface protective film 12 which are superposed by the bonding rollers 71, 72 are conveyed toward the ultraviolet irradiation devices 11, 11 through the drawing rollers 61, 62.
紫外線照射裝置11,11係構成為設置在偏光膜2及片狀保護膜8的搬運路徑上下，而從上下照射紫外線。藉此即使偏光膜2及片狀保護膜8的任一者為不易穿透紫外線的材質時，亦能使紫外線硬化型接著劑確實地硬化，而可使偏光膜2及片狀保護膜8牢固地接著。The ultraviolet irradiation devices 11 and 11 are configured to be disposed above and below the conveyance path of the polarizing film 2 and the sheet-like protective film 8, and to irradiate ultraviolet rays from above and below. Therefore, even if any of the polarizing film 2 and the sheet-like protective film 8 is a material that does not easily penetrate ultraviolet rays, the ultraviolet curable adhesive can be surely cured, and the polarizing film 2 and the sheet-like protective film 8 can be made firm. Go on.
以片狀保護膜8而言，可列舉具有相位差膜功能、亮度提升膜功能、反射膜功能、半穿透反射膜功能、擴散膜功能、及光學補償膜功能等光學性功能之膜。在此情形時，除了可例如藉由在保護膜表面積層相位差膜、亮度提升膜、反射膜、半穿透反射膜、擴散膜及光學補償膜等光功能性膜，而使其具有上述功能之外，亦可對保護膜本身賦予上述功能。再者，亦可像擴散膜具有亮度提升膜功能等一樣，使保護膜本身具有複數種功能。The sheet-like protective film 8 is a film having an optical function such as a retardation film function, a brightness enhancement film function, a reflection film function, a transflective film function, a diffusion film function, and an optical compensation film function. In this case, in addition to the optical functional film such as a retardation film, a brightness enhancement film, a reflection film, a semi-transmissive reflection film, a diffusion film, and an optical compensation film on the surface area of the protective film, the above functions can be achieved. In addition, the above functions can be imparted to the protective film itself. Further, the protective film itself may have a plurality of functions as the diffusion film has the function of the brightness enhancement film.
例如，可在上述保護膜施以日本專利第2841377號公報、日本專利第3094113號公報等記載的延伸處理，或施以日本專利第3168850號公報等記載的處理，藉此可賦予相位差膜之功能。再者，藉由在上述保護膜以日本特開2002-169025號公報、日本特開2003-29030號公報所記載的方法形成微細孔、或重疊選擇反射的中心波長不同之兩層以上的膽固醇型液晶層，即可賦予作為亮度提升膜之功能。以蒸鍍或濺鍍等在上述保護膜形成金屬薄膜，藉此可賦予作為反射膜或半穿透反射膜之功能。藉由將含有微粒子的樹脂溶液被覆在上述保護膜可賦予作為擴散膜之功能。再者，透過將圓盤型液晶性化合物等液晶性化合物被覆在上述保護膜而使其配向，即可賦予作為光學補償膜之功能。又亦可使用適當的接著劑在偏光膜直接貼合商品名稱：DBEF(三M(股)製)等亮度提升膜、商品名稱：WV膜(富士寫真膠片(股)製)等視角改善膜、商品名稱：Sumikalight(註冊商標)(住友化學(股))等相位差膜等市售的光功能性膜。For example, the above-mentioned protective film can be subjected to the stretching treatment described in Japanese Patent No. 2841377, Japanese Patent No. 3094113, or the like, or the treatment described in Japanese Patent No. 3168850, etc., whereby the retardation film can be provided. Features. Further, in the method described in JP-A-2002-169025, JP-A-2003-29030, a micropore or a cholesteric type having two or more layers having different center wavelengths of different selective reflections is formed. The liquid crystal layer can impart a function as a brightness enhancement film. A metal thin film is formed on the protective film by vapor deposition, sputtering, or the like, whereby a function as a reflective film or a semi-transmissive reflective film can be imparted. It is possible to impart a function as a diffusion film by coating a resin solution containing fine particles on the above protective film. In addition, a liquid crystal compound such as a discotic liquid crystalline compound is coated on the protective film to be aligned, whereby a function as an optical compensation film can be imparted. In addition, it is also possible to use a suitable adhesive to directly bond a polarizing film such as a brightness enhancement film such as DBEF (manufactured by San M Co., Ltd.) and a product name: WV film (Fuji Photo Film Co., Ltd.) to improve the film. Product name: A commercially available optical functional film such as a retardation film such as Sumikalight (registered trademark) (Sumitomo Chemical Co., Ltd.).
接著後，表面保護膜12係被捲取成滾筒狀，而與偏光膜2及片狀保護膜8分離，被接著後的偏光膜2及片狀保護膜8係被切割成預定大小，而作為光學積層體加以利用。Then, the surface protective film 12 is wound into a roll shape, and separated from the polarizing film 2 and the sheet-like protective film 8, and the subsequent polarizing film 2 and sheet-like protective film 8 are cut into a predetermined size, and Optical laminates are utilized.
在本發明中，接著上述偏光膜2及保護膜8的紫外線硬化型接著劑係具有當照射紫外線時產生光聚合反應而硬化的特質。例如，當對紫外線硬化型接著劑照射波長350nm至380nm左右的紫外線時，於數十秒開始初期硬化，並在數分鐘後硬化成具有適度的彈性。該種紫外線硬化型接著劑係由預聚物、單體、光聚合開始劑(例如光陽離子聚合開始劑)等構成，對熱膨脹較小、於溫度循環下精密度穩定。更且，由於低收縮故可進行高精密度的接著，且由於低吸水率故即使在高濕高溫等環境下也能維持高品質。以紫外線硬化型接著劑而言，可列舉例如氫化環氧樹脂、脂環式環氧樹脂、脂肪族環氧樹脂等分子內不含芳香環的環氧樹脂接著劑等。In the present invention, the ultraviolet curable adhesive which follows the polarizing film 2 and the protective film 8 has a property of being cured by photopolymerization when irradiated with ultraviolet rays. For example, when the ultraviolet curable adhesive is irradiated with ultraviolet rays having a wavelength of about 350 nm to 380 nm, the initial hardening starts in several tens of seconds, and after several minutes, it hardens to have moderate elasticity. The ultraviolet curable adhesive is composed of a prepolymer, a monomer, a photopolymerization initiator (for example, a photocationic polymerization initiator), and has a small thermal expansion and a high precision under temperature cycle. Further, since the shrinkage is low, high-precision adhesion can be performed, and since the water absorption rate is low, high quality can be maintained even in an environment such as high humidity and high temperature. Examples of the ultraviolet curable adhesive include an epoxy resin adhesive which does not contain an aromatic ring in a molecule such as a hydrogenated epoxy resin, an alicyclic epoxy resin or an aliphatic epoxy resin.
上述之紫外線硬化型接著劑由於在其組成中實質上不含水與其他溶劑，故在偏光膜2與保護膜8之間不殘留溶劑，在耐熱促進試驗中，不會產生偏光板端部的突起、或在與玻璃面的貼合面產生氣泡，而能獲得外觀良好的偏光板及光學積層體。紫外線硬化型接著劑的塗佈量並無特別限定，例如為膜厚0.5μm至6μm、較佳為1μm至4μm。再者，紫外線硬化型接著劑的塗佈方式並未特別限定於第1圖所記載的方法及裝置者。Since the ultraviolet curable adhesive described above does not substantially contain water and other solvents in its composition, no solvent remains between the polarizing film 2 and the protective film 8, and in the heat resistance promoting test, protrusions at the ends of the polarizing plate are not generated. Or, bubbles are generated on the bonding surface with the glass surface, and a polarizing plate and an optical layered body having a good appearance can be obtained. The coating amount of the ultraviolet curable adhesive is not particularly limited, and is, for example, a film thickness of 0.5 μm to 6 μm, preferably 1 μm to 4 μm. Further, the method of applying the ultraviolet curable adhesive is not particularly limited to those of the method and apparatus described in FIG. 1 .
於利用紫外線照射進行硬化時，所用的光源為具有波長100nm至400nm之發光分佈者。紫外線的照射強度係依目的之組成物而各別決定，雖無特別限定，但較佳為對開始劑的活性化有效之波長帶域的照射強度為1至600mW/cm2 。若紫外線的照射強度未達1mW/cm2 ，則反應時間會變得過長，若超過600mW/cm2 ，則會因燈具所輻射的熱及組成物聚合時的發熱，而有產生偏光膜劣化之可能性。When hardening by ultraviolet irradiation, the light source used is a light-emitting distribution having a wavelength of 100 nm to 400 nm. The irradiation intensity of the ultraviolet ray is determined depending on the composition of the object, and is not particularly limited. However, it is preferably an irradiation intensity in a wavelength band effective for activation of the initiator to be 1 to 600 mW/cm 2 . When the irradiation intensity of ultraviolet rays is less than 1 mW/cm 2 , the reaction time becomes too long. If it exceeds 600 mW/cm 2 , the polarized film is deteriorated due to heat radiated from the lamp and heat generated during polymerization of the composition. The possibility.
紫外線的照射時間係依硬化之組成物的不同予以控制，雖還是沒有特別限定，但較佳為設定為由照射強度與照射時間的乘積所表示的累計光量設為10至1,000mJ/cm2 。若累計光量未達10mJ/cm2 ，則來自開始劑的活性種之產生將會不夠，而有硬化變成不足的可能性；另一方面若其累計光量超過1,000mJ/cm2 ，則照射時間會變得極長，不利於生產性。The irradiation time of the ultraviolet ray is controlled depending on the composition to be cured, and is not particularly limited. However, it is preferable to set the amount of integrated light represented by the product of the irradiation intensity and the irradiation time to 10 to 1,000 mJ/cm 2 . If the cumulative amount of light is less than 10 mJ/cm 2 , the generation of the active species from the starter will be insufficient, and there is a possibility that the hardening becomes insufficient; on the other hand, if the cumulative light amount exceeds 1,000 mJ/cm 2 , the irradiation time will be It becomes extremely long and is not conducive to productivity.
照射紫外線時偏光膜2與保護膜8的積層體之搬運速度雖並無特別限定，但較佳為以在搬運方向50至500N/m的張力、照射強度為1至600mW/cm2 、及照射時間為1至10秒的條件下，對積層體照射紫外線。The conveyance speed of the laminate of the polarizing film 2 and the protective film 8 when irradiated with ultraviolet rays is not particularly limited, but is preferably a tension of 50 to 500 N/m in the conveyance direction, an irradiation intensity of 1 to 600 mW/cm 2 , and irradiation. The laminated body is irradiated with ultraviolet rays at a time of 1 to 10 seconds.
再者，於本實施形態中，雖然偏光膜2是採用連續膜的方式、保護膜8是採用片狀膜方式，但亦可採用相反方式，連續膜是保護膜、片狀膜是偏光膜。Further, in the present embodiment, the polarizing film 2 is a continuous film, and the protective film 8 is a sheet film method. Alternatively, the continuous film may be a protective film or the sheet film may be a polarizing film.
此外，藉由將以上述方式所獲得的偏光板、與選自相位差膜、亮度提升膜、視野角改善膜及半穿透反射板中至少一種膜予以貼合，即可製造光學積層體。Further, an optical laminate can be produced by laminating at least one of a polarizing plate obtained as described above and at least one selected from the group consisting of a retardation film, a brightness enhancement film, a viewing angle improvement film, and a transflective reflector.
以下舉實施例具體地說明本發明，惟本發明並不受以下實施例所限定。The invention is specifically described by the following examples, but the invention is not limited by the following examples.
使用第1圖所示裝置將紫外線硬化型接著劑((股)ADEKA製KRX492-25)利用塗佈裝置塗佈在厚度123μm、寬度400mm的聚乙烯醇系偏光膜的單面，然後在其上重疊片狀相位差膜(300mm×400mm、厚度88μm、積水化學(股)製)，接著利用紫外線照射裝置以300mJ/cm2 的累計光量照射5秒鐘的紫外線，而使紫外線硬化型接著劑硬化以獲得偏光板(照射紫外線波長：365nm、接著劑膜厚：3μm、搬運時張力：100N/m)。An ultraviolet curable adhesive (KRX492-25 manufactured by ADEKA Co., Ltd.) was applied to one side of a polyvinyl alcohol-based polarizing film having a thickness of 123 μm and a width of 400 mm by using a coating apparatus as shown in Fig. 1, and then thereon. The sheet-like retardation film (300 mm × 400 mm, thickness: 88 μm, manufactured by Sekisui Chemicals Co., Ltd.) was superimposed, and then ultraviolet rays were irradiated for 5 seconds with an integrated light amount of 300 mJ/cm 2 by an ultraviolet irradiation device to harden the ultraviolet curable adhesive. A polarizing plate (irradiation ultraviolet wavelength: 365 nm, adhesive film thickness: 3 μm, and conveyance tension: 100 N/m) was obtained.
除了使用NS300MP(LINTEC(股)製)作為黏著劑，在偏光膜的單面貼合片狀相位差膜之外，以和實施例1相同之方式製作偏光板，並進行耐熱促進試驗。A polarizing plate was produced in the same manner as in Example 1 except that NS300MP (manufactured by LINTEC Co., Ltd.) was used as the adhesive, and a sheet-like retardation film was bonded to one surface of the polarizing film, and a heat resistance promoting test was performed.
將以實施例1及比較例1所獲得的偏光板在恒溫槽內以85℃與-40℃的溫度條件以30分鐘間隔交互反覆進行加熱與冷卻，於進行此交互動作350次循環後，觀察有無氣泡的產生。結果，發現在比較例1的全周產生氣泡，但在實施例1的偏光板幾乎看不到氣泡。The polarizing plates obtained in Example 1 and Comparative Example 1 were alternately heated and cooled in a thermostatic chamber at a temperature of 85 ° C and -40 ° C at intervals of 30 minutes, and 350 cycles of this interaction were observed. Whether or not there is bubble generation. As a result, it was found that bubbles were generated throughout the entire circumference of Comparative Example 1, but bubbles were hardly observed in the polarizing plate of Example 1.
將由實施例1所獲得的偏光板在85℃的環境下保持250個小時後，以共焦點干涉顯微鏡(SENSOFAR公司製PL-μ2300)觀察膜端部的突起。結果，在從端部到500μm以內的範圍中突起的高度在1μm以內。相對於此，在比較例1的偏光板中，突起高度為3至4μm。The polarizing plate obtained in Example 1 was kept in an environment of 85 ° C for 250 hours, and then the projections at the end portions of the film were observed by a confocal interference microscope (PL-μ2300 manufactured by SENSOFAR Co., Ltd.). As a result, the height of the protrusions in the range from the end to within 500 μm was within 1 μm. On the other hand, in the polarizing plate of Comparative Example 1, the protrusion height was 3 to 4 μm.
以上，就本發明偏光板的製造裝置及製造方法、與藉由該製造方法所得之偏光板及光學積層體詳加說明，但本發明並不受該等說明所限制，在不損及本發明之宗旨的範圍內得以進行適當的變更或改善。The apparatus and method for manufacturing a polarizing plate of the present invention, and the polarizing plate and the optical layered body obtained by the method of the present invention are described in detail above, but the present invention is not limited by the description, and the present invention is not impaired. Appropriate changes or improvements can be made within the scope of the purpose.
1．．．偏光板製造裝置1. . . Polarizing plate manufacturing device
2．．．偏光膜2. . . Polarizing film
3．．．剝離膜3. . . Release film
4．．．第1滾輪4. . . First wheel
5．．．接著劑塗佈裝置5. . . Adhesive coating device
8．．．保護膜8. . . Protective film
9．．．黏著帶9. . . Adhesive tape
10．．．搬運裝置10. . . Handling device
11．．．紫外線照射裝置11. . . Ultraviolet irradiation device
12．．．表面保護膜12. . . Surface protection film
51．．．塗佈滾輪51. . . Coating roller
61,62．．．拉取滾輪61,62. . . Pull roller
71,72．．．貼合滾輪71,72. . . Fitting roller
91．．．拉出滾輪91. . . Pull out the wheel
92．．．捲取滾輪92. . . Take-up roller
第1圖係表示本發明偏光板製造裝置的一實施形態之概略說明圖。Fig. 1 is a schematic explanatory view showing an embodiment of a polarizing plate manufacturing apparatus of the present invention.
1．．．偏光板製造裝置1. . . Polarizing plate manufacturing device
2．．．偏光膜2. . . Polarizing film
3．．．剝離膜3. . . Release film
4．．．第1滾輪4. . . First wheel
5．．．接著劑塗佈裝置5. . . Adhesive coating device
8．．．保護膜8. . . Protective film
9．．．黏著帶9. . . Adhesive tape
10．．．搬運裝置10. . . Handling device
11．．．紫外線照射裝置11. . . Ultraviolet irradiation device
12．．．表面保護膜12. . . Surface protection film
51．．．塗佈滾輪51. . . Coating roller
61,62．．．拉取滾輪61,62. . . Pull roller
71,72．．．貼合滾輪71,72. . . Fitting roller
91．．．拉出滾輪91. . . Pull out the wheel
92．．．捲取滾輪92. . . Take-up roller
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| JP4887013B2 (en) * | 2005-03-18 | 2012-02-29 | 富士フイルム株式会社 | Antireflection film and display device using the same |
| KR20070076318A (en) * | 2006-01-18 | 2007-07-24 | 주식회사 엘지화학 | Fabrication method for polarizer plate, polarizer plate fabricated therefrom, and display device employing thereof |
| JP2007219022A (en) * | 2006-02-14 | 2007-08-30 | Toagosei Co Ltd | Roll-shaped retardation film and elliptically polarizing plate, and method for manufacturing them |
-
2009
- 2009-03-24 TW TW098109454A patent/TWI541569B/en active
- 2009-03-31 CN CN2009101330173A patent/CN101551485B/en active Active
- 2009-03-31 JP JP2009084109A patent/JP5255502B2/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI727208B (en) * | 2018-02-05 | 2021-05-11 | 日商日東電工股份有限公司 | A conveying device for conveying long optical films with slits, and a continuous manufacturing system for optical display panels |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5255502B2 (en) | 2013-08-07 |
| CN101551485A (en) | 2009-10-07 |
| TW200947053A (en) | 2009-11-16 |
| JP2009265646A (en) | 2009-11-12 |
| CN101551485B (en) | 2012-09-05 |
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