TW202028318A - Polarizer and method of manufacturing the same - Google Patents
Polarizer and method of manufacturing the same Download PDFInfo
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- TW202028318A TW202028318A TW108137060A TW108137060A TW202028318A TW 202028318 A TW202028318 A TW 202028318A TW 108137060 A TW108137060 A TW 108137060A TW 108137060 A TW108137060 A TW 108137060A TW 202028318 A TW202028318 A TW 202028318A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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Abstract
Description
本發明係有關可用作偏光板的構成構件之偏光片及其製造方法。 The present invention relates to a polarizer that can be used as a constituent member of a polarizing plate and its manufacturing method.
作為偏光片,已知有已吸附並配向如碘或二色性染料的二色性色素之聚乙烯醇系樹脂膜。專利文獻1至3係提出含鋅者作為該種聚乙烯醇系樹脂膜。 As the polarizer, a polyvinyl alcohol-based resin film in which a dichroic dye such as iodine or a dichroic dye has been adsorbed and aligned is known. Patent Documents 1 to 3 propose zinc-containing resin films as such polyvinyl alcohol-based resin films.
[先前技術文獻] [Prior Technical Literature]
[專利文獻] [Patent Literature]
[專利文獻1]日本特開2003-29042號公報 [Patent Document 1] JP 2003-29042 A
[專利文獻2]日本特開2004-61565號公報 [Patent Document 2] JP 2004-61565 A
[專利文獻3]日本特開2014-102353號公報 [Patent Document 3] JP 2014-102353 A
偏光片在高溫下長時間用作為偏光板的構成構件時,有時會產生變色。因此要求提高偏光片的耐熱性。 When a polarizer is used as a component of a polarizer at a high temperature for a long time, it may be discolored. Therefore, it is required to improve the heat resistance of the polarizer.
本發明的課題係提供具有良好的耐熱性之偏光片。 The subject of the present invention is to provide a polarizer with good heat resistance.
本發明係提供以下的偏光片、偏光板及偏光片的製造方法者。 The present invention provides the following polarizers, polarizers, and methods for manufacturing polarizers.
〔1〕一種偏光片,其厚度為15μm以下且鋅元素之含量為0.3質量%以上0.8質量%以下。 [1] A polarizer having a thickness of 15 μm or less and a zinc element content of 0.3% by mass to 0.8% by mass.
〔2〕一種偏光板,係具備〔1〕所述之偏光片、設在該偏光片的一面之第1熱塑性樹脂膜、及設在另一面之第2熱塑性樹脂膜。 [2] A polarizing plate comprising the polarizer described in [1], a first thermoplastic resin film provided on one side of the polarizer, and a second thermoplastic resin film provided on the other side.
〔3〕如〔2〕所述之偏光板,其中,前述第2熱塑性樹脂膜為相位差膜。 [3] The polarizing plate according to [2], wherein the second thermoplastic resin film is a retardation film.
〔4〕如〔2〕或〔3〕所述之偏光板,其在105℃及1000小時的耐久性試驗前後之發光因數(luminosity factor)校正單體穿透率Ty之差的絶對值△Ty為4%以下。 [4] The polarizing plate as described in [2] or [3], the absolute value △Ty of the luminosity factor corrected for the difference in monomer transmittance Ty before and after the durability test at 105°C and 1000 hours Below 4%.
〔5〕如〔2〕至〔4〕中任一項所述之偏光板,其在105℃及1000小時的耐久性試驗前後之於波長500nm以上600nm以下的TD穿透率之極大值之差的絶對值△TD為0.014以下。 [5] The polarizing plate described in any one of [2] to [4], the difference between the maximum value of the TD transmittance at a wavelength of 500nm to 600nm before and after the durability test at 105°C and 1000 hours The absolute value of ΔTD is 0.014 or less.
〔6〕如〔2〕至〔5〕中任一項所述之偏光板,其在105℃及1000小時的耐久性試驗前後之正交色相a值的差之絶對值△a為2.5以下。 [6] The polarizing plate according to any one of [2] to [5], wherein the absolute value Δa of the difference in the orthogonal hue a value before and after the durability test at 105° C. and 1000 hours is 2.5 or less.
〔7〕一種車載用顯示裝置,係依序具備〔2〕至〔6〕中任一項所述之偏光板、貼合在前述偏光板的靠第1熱塑性樹脂膜側之表面的透光性構件及貼合在前述偏光板的靠第2熱塑性樹脂膜側之表面的顯示裝置。 [7] An in-vehicle display device comprising the polarizing plate described in any one of [2] to [6], and the light transmittance of the polarizing plate attached to the surface of the polarizing plate on the side of the first thermoplastic resin film The member and the display device bonded to the surface of the polarizing plate on the second thermoplastic resin film side.
〔8〕一種偏光片的製造方法,係製造〔1〕所述之偏光片的製造方法,其中, [8] A method for manufacturing a polarizer, which is the method for manufacturing the polarizer described in [1], wherein:
前述偏光片含有聚乙烯醇系樹脂, The aforementioned polarizer contains polyvinyl alcohol resin,
對聚乙烯醇系樹脂膜施加處理的處理液之至少一個含有鋅鹽。 At least one of the treatment liquids for treating the polyvinyl alcohol-based resin film contains a zinc salt.
藉由本發明,可提供具有良好的耐熱性之偏光片。 With the present invention, a polarizer with good heat resistance can be provided.
100:偏光板 100: Polarizing plate
101:偏光片 101: Polarizer
102:第1熱塑性樹脂膜 102: The first thermoplastic resin film
103:第2熱塑性樹脂膜 103: The second thermoplastic resin film
第1圖係顯示本發明的一形態之偏光片的製造方法之流程圖。 Fig. 1 is a flowchart showing a method of manufacturing a polarizer according to one aspect of the present invention.
第2圖係顯示本發明的一形態之偏光板的示意剖面圖。 Fig. 2 is a schematic cross-sectional view showing a polarizing plate according to an aspect of the present invention.
<偏光片> <Polarizer>
本發明的一形態之偏光片,其厚度為15μm以下且鋅元素的含量為0.3質量%以上0.8質量%以下。偏光片濕吸收型的偏光片,該吸收型的偏光片具備將具有與其吸收軸平行的振動面之直線偏光吸收,且使具有與吸收軸垂直(與透過軸平行)的振動面之直線偏光穿透的性質。偏光片可以例如使經單軸延伸的聚乙烯醇系樹脂膜吸附二色性色素並配向而成之偏 光片,該種偏光片可依照後述的製造方法製造。於偏光片的表面藉由接著劑或黏著劑等與保護膜等貼合,可作為偏光板使用。以下如無特別的說明,偏光板係指在偏光片的至少一面具備熱塑性樹脂膜之偏光板。 The polarizer of one aspect of the present invention has a thickness of 15 μm or less and a zinc element content of 0.3% by mass to 0.8% by mass. Polarizer Wet absorption type polarizer, the absorption type polarizer is equipped to absorb linearly polarized light having a vibration surface parallel to its absorption axis, and pass linearly polarized light having a vibration surface perpendicular to the absorption axis (parallel to the transmission axis) Transparent nature. The polarizer may be, for example, a polarizer formed by aligning a dichroic dye on a polyvinyl alcohol-based resin film stretched uniaxially, and such a polarizer can be manufactured in accordance with the manufacturing method described later. It can be used as a polarizing plate by bonding with a protective film or the like on the surface of the polarizer with an adhesive or adhesive. Unless otherwise specified below, the polarizing plate refers to a polarizing plate provided with a thermoplastic resin film on at least one side of the polarizer.
本發明的一形態之偏光片可發揮優異的耐熱性。本發明的一形態之偏光片,較佳係在使用偏光片作為偏光板的構成構件而進行耐久性試驗時,均可防止泛黃、白化及泛紅。本發明中的耐久性試驗係指依照後述的實施例欄中說明的方法進行之耐久性試驗。泛黃、白化及泛紅係如後述的段落中說明。 The polarizer of one aspect of the present invention can exhibit excellent heat resistance. It is preferable that the polarizer of one aspect of the present invention can prevent yellowing, whitening, and redness when a durability test is performed using a polarizer as a component of the polarizing plate. The durability test in the present invention refers to a durability test performed in accordance with the method described in the Examples column described later. The yellowing, whitening, and redness are as explained in the paragraphs mentioned later.
車載用顯示裝置的偏光板係例如藉由黏著劑或接著劑貼合在圖像顯示單元,且在与貼合於前述圖像顯示單元上之面為相反側之面藉由黏著劑或接著劑与玻璃板、觸控面板等透光性構件貼合。車載用顯示裝置的偏光板有在較高溫下長時間使用的情形,此時會有容易發生變色的傾向。本發明人進行有關變色的研究結果發現,在較高溫下長時間使用的偏光板會發生之變色可大致區分為泛黃、白化及泛紅3種。以下有時將泛黃、白化及泛紅統稱為變色。 The polarizing plate of the vehicle-mounted display device is attached to the image display unit by, for example, an adhesive or adhesive, and the adhesive or adhesive is applied to the surface opposite to the surface attached to the image display unit. Laminate with translucent members such as glass plates and touch panels. The polarizing plate of the vehicle-mounted display device may be used for a long time at a relatively high temperature, and discoloration tends to occur in this case. The inventors of the present invention conducted research on discoloration and found that the discoloration of polarizers that have been used for a long time at a higher temperature can be roughly classified into three types: yellowing, whitening, and reddening. Hereinafter, yellowing, whitening, and redness are sometimes collectively referred to as discoloration.
泛黃係在偏光板的耐久性試驗前後中透過光學顯微鏡透光觀察時可見到的顏色之變化。依本發明人研究泛黃的結果可知,在使用偏光片的偏光板之耐久性試驗前後之發光因數校正單體穿透率(Ty)之差的絶對值△Ty(以下,簡稱為「△Ty」)較小時,泛黃也同樣有較少的傾向。雖然推測泛黃的產生係因為將偏光板加熱至超過90℃時,配向吸附在聚乙烯醇系樹脂膜中的聚碘錯合物I3 -及I5 -之一部分受到熱分解而成為I2,藉由I2產生的脫水反應而使聚乙烯醇系樹脂膜中的羥基脫離而生 成雙鍵之緣故,但本發明並非侷限於此推測者。發光因數校正單體穿透率(Ty)係依照後述的實施例欄中說明的測定方法測定。 Yellowing is the change in color that is visible when observed through an optical microscope before and after the durability test of the polarizing plate. According to the results of the inventor’s research on yellowing, it can be seen that the absolute value △Ty (hereinafter referred to as "△Ty) of the difference between the luminous factor correction monomer transmittance (Ty) before and after the durability test of the polarizing plate using the polarizer ") When it is smaller, the yellowing also tends to be less. Although it is presumed that the yellowing is caused by heating the polarizing plate to over 90°C, part of the polyiodide complexes I 3 - and I 5 - oriented and adsorbed in the polyvinyl alcohol-based resin film are thermally decomposed and become I 2 Because the dehydration reaction generated by I 2 detaches the hydroxyl group in the polyvinyl alcohol-based resin film to form a double bond, the present invention is not limited to this guess. The luminescence factor corrected monomer transmittance (Ty) is measured in accordance with the measurement method described in the column of Examples described later.
白化係指在偏光板的耐久性試驗前後中透過光學顯微鏡透光而觀察其他偏光板時,使偏光板旋轉而在最黑暗的視野狀態觀察到漏光之情形等。由本發明人對白化的研究結果可知,在耐久性試驗前後之於波長500nm以上600nm以下的TD穿透率之極大值(TDmax)之差的絶對值△TD(以下簡稱「△TD」)較小時,白化也同樣有較少的傾向。雖然推測白化的產生係因為配向吸附在偏光片中的聚乙烯醇系樹脂膜中之聚碘錯合物I3 -及I5 -於耐久性試驗中受到熱分解,而使偏光片中的聚碘錯合物I3 -及I5 -之含量變少的緣故,但本發明並非侷限於此推測者。於波長500nm以上600nm以下的TD穿透率之極大值(TDmax)係依照後述的實施例欄中說明的測定方法測定。 Whitening refers to a situation in which light leakage is observed in the darkest visual field by rotating the polarizing plate when observing other polarizing plates through an optical microscope before and after the durability test of the polarizing plate. According to the results of the inventor’s research on whitening, the absolute value △TD (hereinafter referred to as "△TD") of the difference between the maximum value (TDmax) of the TD transmittance at a wavelength of 500nm to 600nm before and after the durability test is small At times, bleaching also has less tendency. Although it is presumed that whitening occurs because the polyiodide complexes I 3 - and I 5 - in the polyvinyl alcohol-based resin film aligned and adsorbed in the polarizer are thermally decomposed in the durability test, and the polymerization in the polarizer The content of iodine complexes I 3 - and I 5 - is reduced, but the present invention is not limited to this speculation. The maximum value (TDmax) of the TD transmittance at a wavelength of 500 nm or more and 600 nm or less is measured in accordance with the measurement method described in the Examples column described later.
泛紅係指在偏光板的耐久性試驗前後中透過光學顯微鏡透光而觀察時可見到的顏色之變化。由本發明人對泛紅的研究結果可知,在使用偏光片的偏光板之耐久性試驗前後之正交色相a之差的絶對值△a(以下簡稱「△a」)較小時,泛紅也同樣有變少的傾向。雖然推測泛紅的產生係因為使配向吸附在偏光片中的聚乙烯醇系樹脂膜中之在可見光的波長較長側具有極大吸收的聚碘錯合物I5 -於耐久性試驗中受到熱分解,而使I5 -之含量變少的緣故,但本發明並非侷限於此推測者。正交色相a係依照後述的實施例欄中說明的測定方法測定。 Redness refers to the change in color that is visible when observed through an optical microscope before and after the durability test of the polarizing plate. From the results of the inventor’s research on redness, it can be seen that when the absolute value Δa (hereinafter referred to as "Δa") of the difference between the orthogonal hue a before and after the durability test of the polarizer using the polarizer is small, the redness is also There is also a tendency to decrease. While the presumed cause redness generating system because the alignment of the adsorbed iodine complexes with polyethylene of maximum absorption of visible light in the longer wavelength side of the polyvinyl alcohol-based resin film in a polarizing sheet I 5 - subjected to heat in the durability test It is decomposed to reduce the content of I 5 - , but the present invention is not limited to this guess. The orthogonal hue a is measured in accordance with the measurement method described in the column of Examples described later.
偏光片的厚度通常係15μm以下,以14μm以下為佳,以13μm以下為更佳,而以12μm以下為又更佳。偏光片的厚度為 15μm以下時,有容易防止白化的傾向。此外,將偏光片的厚度變薄有利於偏光板的薄膜化。偏光片的厚度通常係2μm以上,例如可以為5μm以上。 The thickness of the polarizer is usually 15 μm or less, preferably 14 μm or less, more preferably 13 μm or less, and more preferably 12 μm or less. When the thickness of the polarizer is 15 μm or less, whitening tends to be easily prevented. In addition, making the thickness of the polarizer thinner is beneficial to thinning the polarizer. The thickness of the polarizer is usually 2 μm or more, for example, it may be 5 μm or more.
偏光片的厚度例如可藉由聚乙烯醇系樹脂膜之選定、延伸倍率的調整等而設為上述範圍的厚度。 The thickness of the polarizer can be set to the thickness of the above-mentioned range by, for example, selection of a polyvinyl alcohol-based resin film, adjustment of a stretching ratio, and the like.
以偏光片的質量為基準,偏光片的鋅元素之含量係0.3質量%以上0.8質量%以下。鋅元素的含量為0.3質量%以上時,有容易防止泛黃及泛紅的傾向。此外,鋅元素的含量為0.8質量%以下時,有容易防止白化的傾向。就防止泛黃及泛紅而言,鋅元素的含量係以0.305質量%以上為佳,以0.31質量%以上為更佳。另一方面,就防止白化而言,鋅元素的含量係以0.75質量%以下為佳,以0.7質量%以下為更佳,以0.65質量%以下為又更佳,以0.5質量%以下為又更佳。鋅元素的含量可依照後述的實施例欄中說明的測定方法測定。 Based on the quality of the polarizer, the content of zinc in the polarizer is 0.3% by mass to 0.8% by mass. When the content of the zinc element is 0.3% by mass or more, it tends to be easy to prevent yellowing and redness. In addition, when the content of zinc element is 0.8% by mass or less, it tends to be easy to prevent whitening. In terms of preventing yellowing and redness, the content of zinc element is preferably 0.305% by mass or more, and more preferably 0.31% by mass or more. On the other hand, in terms of preventing whitening, the content of zinc element is preferably 0.75 mass% or less, more preferably 0.7 mass% or less, more preferably 0.65 mass% or less, and more preferably 0.5 mass% or less good. The content of zinc element can be measured in accordance with the measurement method described in the column of Examples described later.
鋅元素的含量例如可藉由調整對聚乙烯醇系樹脂膜施加處理的處理液中之鋅鹽濃度、聚乙烯醇系樹脂膜浸漬在含鋅鹽的處理液中之時間、處理液的溫度等而設為上述範圍的鋅元素之含量。 The content of the zinc element can be adjusted, for example, by adjusting the zinc salt concentration in the treatment solution for treating the polyvinyl alcohol resin film, the time the polyvinyl alcohol resin film is immersed in the treatment solution containing the zinc salt, the temperature of the treatment solution, etc. And set it as the content of zinc element in the said range.
據推測,藉由使偏光片為上述範圍的厚度,可使受偏光片中因熱分解導致之聚碘錯合物I3 -及I5 -的減少量變少,因而減少受到白化之影響,同時藉由使偏光片含有上述範圍的含量的鋅元素,可防止偏光片中的聚碘錯合物I3 -及I5 -之熱分解以及I2的生成,有難以產生泛黃或泛紅等變色的傾向,但本發明並非侷限於此推測者。 It is presumed that by setting the thickness of the polarizer in the above range, the reduction of polyiodide complexes I 3 - and I 5 - caused by thermal decomposition in the polarizer can be reduced, thereby reducing the effect of whitening. By making the polarizer contain the zinc element in the above range, the thermal decomposition of the polyiodide complexes I 3 - and I 5 - and the formation of I 2 in the polarizer can be prevented, and it is difficult to produce yellowing or redness. The tendency to discolor, but the present invention is not limited to this guesser.
偏光片在耐久性試驗前之發光因數校正單體穿透率(Ty)例如可超過40.5%,發光因數校正單體穿透率(Ty)的下限值係以41.0%以上為佳,其上限值通常係50%以下,並以47%以下為佳。 The luminescence factor correction monomer transmittance (Ty) of the polarizer before the durability test can exceed 40.5%, for example, and the lower limit of the luminescence factor correction monomer transmittance (Ty) is preferably 41.0% or more. The limit is usually below 50%, and preferably below 47%.
偏光片的△Ty例如可以為4%以下,並以3.5%以下為更佳。 The ΔTy of the polarizer may be 4% or less, and more preferably 3.5% or less.
偏光片的耐久性試驗前之發光因數校正單體穿透率(Ty)為41.5%時,發光因數校正偏光度(Py)例如可超過99.980,發光因數校正單體穿透率(Ty)為41.5%時,發光因數校正偏光度(Py)的下限值係以99.985以上為佳。 When the luminescence factor correction monomer transmittance (Ty) before the durability test of the polarizer is 41.5%, the luminescence factor correction polarization degree (Py) can exceed 99.980, for example, and the luminescence factor correction monomer transmittance (Ty) is 41.5 %, the lower limit of the luminous factor correction polarization (Py) is preferably 99.985 or more.
偏光片在耐久性試驗前之於波長500nm以上600nm以下的TD穿透率之極大值(TDmax)例如可為0.01以下,並以0.008以下為佳。 The maximum value (TDmax) of the TD transmittance of the polarizer at a wavelength of 500 nm or more and 600 nm or less before the durability test may be 0.01 or less, and preferably 0.008 or less.
偏光片的△TD例如可為0.014以下,並以0.01以下為佳。 The ΔTD of the polarizer can be, for example, 0.014 or less, and preferably 0.01 or less.
偏光片在耐久性試驗前之正交色相a例如可為2.6以下,並以1以下為佳。 The orthogonal hue a of the polarizer before the durability test can be, for example, 2.6 or less, and preferably 1 or less.
偏光片的△a例如可為2.5以下,並以2.45以下為佳。 The Δa of the polarizer can be, for example, 2.5 or less, and preferably 2.45 or less.
偏光片的發光因數校正單體穿透率(Ty)、△Ty、△TD、發光因數校正偏光度(Py)、正交色相a及△a,可依照後述的實施例欄中說明的方法以與測定偏光板時相同的操作進行測定。 The luminescence factor correction monomer transmittance (Ty), △Ty, △TD, luminescence factor correction polarization degree (Py), orthogonal hue a and △a of the polarizer can be used according to the method described in the following example column The measurement is performed in the same way as when measuring the polarizing plate.
<偏光片的製造方法> <Method of manufacturing polarizer>
參照圖式來說明本發明的另一形態之偏光片的製造方法。 The manufacturing method of another aspect of the polarizer of the present invention will be described with reference to the drawings.
第1圖顯示的製造方法係含有聚乙烯醇系樹脂膜的偏光片之製造方法,其可包含下列步驟: The manufacturing method shown in Figure 1 is a manufacturing method of a polarizer containing a polyvinyl alcohol resin film, which may include the following steps:
將聚乙烯醇系樹脂膜浸漬在收容含二色性色素的處理液之染色槽中而進行染色的染色步驟S20;以及 Dyeing step S20 in which the polyvinyl alcohol-based resin film is immersed in a dyeing tank containing a treatment solution containing a dichroic dye to perform dyeing; and
將染色步驟後之膜浸漬在收容含交聯劑的處理液之交聯槽中而進行交聯處理之交聯步驟S30。 The film after the dyeing step is immersed in a cross-linking tank containing a treatment liquid containing a cross-linking agent to perform a cross-linking step S30 of cross-linking treatment.
製造方法可進一步包含上述以外的其他步驟,其具體例如第1圖所示,係有在染色步驟S20前將聚乙烯醇系樹脂膜浸漬在收容含水的處理液之膨潤槽中之膨潤步驟S10、將交聯步驟S30後之膜浸漬在清洗槽中之清洗步驟S40、及清洗步驟S40後的乾燥步驟S50。此外,聚乙烯醇系樹脂膜係在偏光片製造步驟的任意一個以上之階段中進行單軸延伸處理,更具體言之,係在從膨潤步驟S10之前至交聯步驟S30為止的任意一個以上的階段中進行單軸延伸處理(延伸步驟)。 The manufacturing method may further include other steps than the above. The specific example shown in Figure 1 is a swelling step S10 in which a polyvinyl alcohol resin film is immersed in a swelling tank containing a water-containing treatment solution before the dyeing step S20. The washing step S40 in which the film after the crosslinking step S30 is immersed in a washing tank, and the drying step S50 after the washing step S40. In addition, the polyvinyl alcohol-based resin film is uniaxially stretched in any one or more stages of the polarizer manufacturing step, more specifically, in any one or more stages from before the swelling step S10 to the crosslinking step S30 During the uniaxial stretching process (stretching step).
製造方法中,對聚乙烯醇系樹脂膜施加處理的至少一個處理液係含有鋅鹽。收容處理液的處理槽可列舉:例如膨潤槽、染色槽、交聯槽、清洗槽、後述的補色槽等。收容含鋅的處理液之處理槽係以位於染色槽後至清洗槽前的處理槽為佳,以選自交聯槽及補色槽中的至少1個為更佳,並以在有2個以上的交聯槽時選自最後的交聯槽及補色槽中之至少1個為又更佳。藉由將聚乙烯醇系樹脂膜浸漬在含鋅鹽的處理液中,可使所得的偏光片含有鋅元素。偏光片中的鋅元素之含量可藉由調整處理液中的鋅濃度、聚乙烯醇系樹脂膜浸漬在含鋅鹽的處理液中之時間、處理液的溫度等而設為上述範圍的鋅元素之含量。 In the manufacturing method, at least one treatment liquid system for treating the polyvinyl alcohol-based resin film contains a zinc salt. Examples of the processing tank that contains the processing liquid include a swelling tank, a dyeing tank, a cross-linking tank, a washing tank, and the color correction tank described later. The treatment tank containing the treatment solution containing zinc is preferably the treatment tank located after the dyeing tank and before the cleaning tank, preferably at least one selected from the cross-linking tank and the complementary color tank, and more than two When the cross-linking tank is selected from at least one of the last cross-linking tank and complementary color tank, it is more preferable. By immersing the polyvinyl alcohol-based resin film in a treatment solution containing zinc salt, the obtained polarizer can contain zinc element. The content of the zinc element in the polarizer can be adjusted to the zinc element in the above range by adjusting the zinc concentration in the treatment liquid, the time for immersing the polyvinyl alcohol resin film in the treatment liquid containing the zinc salt, the temperature of the treatment liquid, etc. The content.
處理液中含有的鋅鹽可列舉:例如氯化鋅、碘化鋅等鹵化鋅、或硫酸鋅、乙酸鋅、硝酸鋅等。其中就張力的變化小而言,係以硝酸鋅為佳。鋅鹽可添加在處理液中作為鋅溶液。 Examples of the zinc salt contained in the treatment liquid include zinc halides such as zinc chloride and zinc iodide, or zinc sulfate, zinc acetate, and zinc nitrate. Among them, in terms of small changes in tension, zinc nitrate is preferred. Zinc salt can be added to the treatment solution as a zinc solution.
處理液中的鋅鹽之濃度可於各個處理槽中為不同,但相對於收容在處理槽的處理液100質量份,其例如可為2質量份以上4質量份以下。 The concentration of the zinc salt in the treatment liquid may be different in each treatment tank, but it may be, for example, 2 parts by mass or more and 4 parts by mass or less with respect to 100 parts by mass of the treatment liquid contained in the treatment tank.
在處理液中的聚乙烯醇系樹脂膜之浸漬時間及處理液的溫度可在各個處理槽中為不同。具體的浸漬時間及處理液的溫度係如後述段落中的各個步驟說明。 The immersion time of the polyvinyl alcohol resin film in the treatment liquid and the temperature of the treatment liquid may be different in each treatment tank. The specific immersion time and the temperature of the treatment liquid are as described in the respective steps in the later paragraphs.
本發明的製造方法中包含的各種處理步驟可藉由下述方式而連續地施行:沿著偏光片製造裝置的膜運送路徑來連續地運送作為原料膜之聚乙烯醇系樹脂膜。膜運送路徑係依該等實施順序而具備用以施行上述各種處理步驟之設備(處理槽或爐等)。 The various processing steps included in the manufacturing method of the present invention can be continuously performed by continuously conveying the polyvinyl alcohol-based resin film as the raw film along the film conveying path of the polarizer manufacturing apparatus. The film transport path is equipped with equipment (processing tank, furnace, etc.) for performing the above-mentioned various processing steps according to the implementation sequence.
除了上述設備以外,亦可藉由在適當的位置配置導輥或軋輥而建構膜運送路徑。例如,導輥可配置在各處理槽的前後或處理槽中,藉此可將膜導入、浸漬在處理槽中,並從處理槽中拉出。更具體而言,藉由在各處理槽中設置2個以上的導輥,並沿著此等導輥運送膜,可使膜浸漬在各處理槽中。 In addition to the above-mentioned equipment, it is also possible to construct a film transport path by arranging guide rolls or nip rolls at appropriate positions. For example, guide rollers can be arranged before and after each treatment tank or in the treatment tank, whereby the film can be introduced, immersed in the treatment tank, and drawn out of the treatment tank. More specifically, by arranging two or more guide rollers in each treatment tank and transporting the film along these guide rollers, the film can be immersed in each treatment tank.
構成作為原料膜的聚乙烯醇系樹脂膜之聚乙烯醇系樹脂,可使用經皂化的聚乙酸乙烯酯系樹脂。除了屬於乙酸乙烯酯的均聚物之以外,聚乙酸乙烯酯系樹脂可例示乙酸乙烯酯與可和該乙酸乙烯酯共聚合的其他單體之共聚合物。可與乙酸乙烯酯共聚合的其他單體可列舉:例如不 飽和羧酸類、烯烴類、乙烯醚類、不飽和磺酸類、具銨基的(甲基)丙烯醯胺類等。聚乙烯醇系樹脂的皂化度通常係約85莫耳%以上,以約90莫耳%以上為佳,並以約99莫耳%以上為更佳。本說明書中的「(甲基)丙烯酸」係指選自丙烯酸基及甲基丙烯酸基中的至少一種。於「(甲基)丙烯醯基」亦同理。 As the polyvinyl alcohol-based resin constituting the polyvinyl alcohol-based resin film as the raw material film, a saponified polyvinyl acetate-based resin can be used. In addition to the homopolymers of vinyl acetate, polyvinyl acetate-based resins can be exemplified by copolymers of vinyl acetate and other monomers copolymerizable with the vinyl acetate. Other monomers that can be copolymerized with vinyl acetate include: Saturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, (meth)acrylamides with ammonium groups, etc. The degree of saponification of the polyvinyl alcohol-based resin is usually about 85 mol% or more, preferably about 90 mol% or more, and more preferably about 99 mol% or more. The "(meth)acrylic acid" in this specification means at least one selected from an acrylic group and a methacrylic group. The same applies to "(meth)acrylic acid base".
聚乙烯醇系樹脂可以經改質,例如可使用經醛類改質之聚乙烯甲醛、聚乙烯縮醛、聚乙烯醇縮丁醛等。 The polyvinyl alcohol-based resin may be modified. For example, polyvinyl formaldehyde, polyvinyl acetal, polyvinyl butyral, etc. modified by aldehydes can be used.
聚乙烯醇系樹脂的平均聚合度係以100以上10,000以下為佳,以1,500以上8,000以下為更佳,並以2,000以上5,000以下為又更佳。聚乙烯醇系樹脂的平均聚合度係根據JIS K 6726(1994)求得。平均聚合度如未達100時難以獲得良好的偏光性能,超過10,000時膜之加工性會變差。 The average degree of polymerization of the polyvinyl alcohol resin is preferably 100 or more and 10,000 or less, more preferably 1,500 or more and 8,000 or less, and more preferably 2,000 or more and 5,000 or less. The average degree of polymerization of the polyvinyl alcohol-based resin is determined based on JIS K 6726 (1994). If the average degree of polymerization is less than 100, it is difficult to obtain good polarization performance, and when it exceeds 10,000, the processability of the film will deteriorate.
聚乙烯醇系樹脂膜的厚度係例如大約10μm以上50μm以下,就將偏光片的厚度設為15μm以下而言,係以40μm以下為佳,並以30μm以下為更佳。 The thickness of the polyvinyl alcohol resin film is, for example, about 10 μm or more and 50 μm or less. When the thickness of the polarizer is 15 μm or less, it is preferably 40 μm or less, and 30 μm or less For better.
作為原料膜的聚乙烯醇系樹脂膜,可準備作為長條狀的未延伸或延伸之聚乙烯醇系樹脂的膜捲(捲繞品)。此時,偏光片也可作為長條物而得到。以下詳細說明各步驟。 The polyvinyl alcohol-based resin film as the raw material film can be prepared as a long unstretched or stretched polyvinyl alcohol-based resin film roll (winding product). In this case, the polarizer can also be obtained as a long object. The steps are described in detail below.
(1)膨潤步驟S10 (1) Swelling step S10
本步驟中的膨潤處理係基於作為原料膜的聚乙烯醇系樹脂膜之去除異物、去除塑化劑、賦予易染色性、膜之塑化等目的而視需要實施的處理,具體上可以採用將聚乙烯醇系樹脂膜浸漬在收容含水之處理液的膨潤槽中 之處理。該膜可浸漬在1個膨潤槽中,也可依序浸漬在2個以上的膨潤槽中。在膨潤處理前、膨潤處理時、或膨潤處理前及膨潤處理時,可對膜進行單軸延伸處理。 The swelling treatment in this step is based on the polyvinyl alcohol resin film as the raw material film to remove foreign matter, remove plasticizers, impart easy dyeability, and plasticize the film as needed. Specifically, it can be The polyvinyl alcohol resin film is immersed in a swelling tank containing a treatment liquid containing water 的处理。 Treatment. The film can be immersed in one swelling tank or in two or more swelling tanks in sequence. Before swelling treatment, during swelling treatment, or before swelling treatment and during swelling treatment, the film can be subjected to uniaxial stretching treatment.
膨潤槽中收容的處理液除了水(例如純水)以外,也可以是已添加如醇類的水溶性有機溶劑之水溶液。如上述,膨潤槽中收容的處理液可含有鋅鹽。 In addition to water (for example, pure water), the treatment liquid contained in the swelling tank may also be an aqueous solution to which a water-soluble organic solvent such as alcohol has been added. As mentioned above, the treatment liquid contained in the swelling tank may contain zinc salt.
浸漬膜時的膨潤槽中收容之處理液的溫度通常係10至70℃左右,以15至50℃左右為佳,膜的浸漬時間通常係10至600秒左右,以20至300秒左右為佳。 The temperature of the treatment liquid contained in the swelling tank when the film is immersed is usually about 10 to 70°C, preferably about 15 to 50°C, and the immersion time of the film is usually about 10 to 600 seconds, preferably about 20 to 300 seconds .
(2)染色步驟S20 (2) Dyeing step S20
本步驟中的染色處理係基於使聚乙烯醇系樹脂膜吸附二色性色素並配向之目的而進行的處理,具體上可採用將聚乙烯醇系樹脂膜浸漬在收容含有二色性色素的處理液之染色槽中之處理。該膜可浸漬在1個染色槽中,也可依序浸漬在2個以上的染色槽中。為提高二色性色素的染色性,用於染色步驟之膜也可施加至少某種程度的單軸延伸處理。亦可在染色處理時進行單軸延伸處理,以取代染色處理前的單軸延伸處理,或與染色處理前的單軸延伸處理一起進行。 The dyeing treatment in this step is based on the purpose of making the polyvinyl alcohol resin film adsorb and align the dichroic pigment. Specifically, the polyvinyl alcohol resin film can be immersed in the container containing the dichroic pigment. Treatment in the dyeing tank of liquid. The film can be immersed in one dyeing tank or in two or more dyeing tanks in sequence. In order to improve the dyeability of the dichroic pigment, the film used in the dyeing step may also be subjected to at least some degree of uniaxial stretching treatment. It is also possible to perform the uniaxial stretching treatment during the dyeing treatment to replace the uniaxial stretching treatment before the dyeing treatment, or perform it together with the uniaxial stretching treatment before the dyeing treatment.
二色性色素可以是碘或二色性有機染料。二色性有機染料之具體例係包含Red BR、Red LR、Red R、Pink LB、Rubin BL、Bordeaux GS、Sky Blue LG、Lemon Yellow、Blue BR、Blue 2R、Navy RY、Green LG、Violet LB、Violet B、Black H、Black B、Black GSP、Yellow 3G、Yellow R、Orange LR、Orange 3R、Scarlet GL、 Scarlet KGL、Congo Red、Brilliant Violet BK、Supra Blue G、Supra Blue GL、Supra Orange GL、Direct Sky Blue、Direct Fast Orange S、Fast Black。二色性色素可僅單獨使用1種,也可同時使用2種以上。 The dichroic dye may be iodine or a dichroic organic dye. Specific examples of dichroic organic dyes include Red BR, Red LR, Red R, Pink LB, Rubin BL, Bordeaux GS, Sky Blue LG, Lemon Yellow, Blue BR, Blue 2R, Navy RY, Green LG, Violet LB, Violet B, Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Scarlet GL, Scarlet KGL, Congo Red, Brilliant Violet BK, Supra Blue G, Supra Blue GL, Supra Orange GL, Direct Sky Blue, Direct Fast Orange S, Fast Black. The dichroic dye may be used alone or in combination of two or more.
使用碘作為二色性色素時,可於染色槽中收容的處理液中使用含有碘及碘化鉀的水溶液。可使用碘化鋅等其他的碘化物取代碘化鉀,也可同時使用碘化鉀與其他的碘化物。此外,也可使例如硼酸、氯化鋅、氯化鈷等碘化物以外的化合物共存。添加硼酸時,係依碘的含有而與後述之交聯處理做區別。上述水溶液中的碘之含量通常係每在100質量份的水中占0.01質量份以上1質量份以下。此外,碘化鉀等碘化物之含量通常係在每100質量份的水中占0.5質量份以上20質量份以下。如上述,染色槽中收容的處理液可含有鋅鹽。 When iodine is used as a dichroic dye, an aqueous solution containing iodine and potassium iodide can be used in the treatment liquid contained in the dyeing tank. Other iodides such as zinc iodide can be used instead of potassium iodide, or potassium iodide and other iodides can be used together. In addition, compounds other than iodides such as boric acid, zinc chloride, and cobalt chloride may coexist. When boric acid is added, it is distinguished from the cross-linking treatment described later according to the content of iodine. The content of iodine in the above-mentioned aqueous solution is usually 0.01 part by mass to 1 part by mass per 100 parts by mass of water. In addition, the content of iodides such as potassium iodide is usually 0.5 to 20 parts by mass per 100 parts by mass of water. As mentioned above, the treatment liquid contained in the dyeing tank may contain zinc salt.
浸漬膜時的在染色槽中所收容的處理液之溫度通常係10℃以上45℃以下,以10℃以上40℃以下為佳,並以20℃以上35℃以下為更佳,膜之浸漬時間通常係30秒以上600秒以下,並以60秒以上300秒以下為佳。 The temperature of the treatment solution contained in the dyeing tank when immersing the film is usually 10°C or more and 45°C or less, preferably 10°C or more and 40°C or less, and more preferably 20°C or more and 35°C or less. The immersion time of the film Generally, it is 30 seconds or more and 600 seconds or less, and preferably 60 seconds or more and 300 seconds or less.
使用二色性有機染料作為二色性色素時,染色槽中收容的處理液可使用含有二色性有機染料之水溶液。該水溶液中的二色性有機染料之含量通常係在每100質量份的水中占1×10-4質量份以上10質量份以下,以1×10-3質量份以上1質量份以下為佳。染色槽中也可共存染色助劑等,例如含有硫酸鈉等無機鹽或界面活性劑等。二色性有機染料可僅單獨使用1種,也可同時使用2種以上。浸漬膜時的染色槽中收容之處理液 的溫度係例如20℃以上80℃以下,以30℃以上70℃以下為佳,膜之浸漬時間通常係30秒以上600秒以下,以60秒以上300秒以下為佳。 When a dichroic organic dye is used as the dichroic dye, the treatment liquid contained in the dyeing tank can be an aqueous solution containing the dichroic organic dye. The content of the dichroic organic dye in the aqueous solution is usually 1×10 -4 parts by mass to 10 parts by mass per 100 parts by mass of water, preferably 1×10 -3 parts by mass to 1 part by mass. Dyeing auxiliaries and the like may also coexist in the dyeing tank, for example, containing inorganic salts such as sodium sulfate or surfactants. The dichroic organic dye may be used alone or in combination of two or more. The temperature of the treatment solution contained in the dyeing tank when the film is dipped is, for example, 20°C or more and 80°C or less, preferably 30°C or more and 70°C or less. The immersion time of the film is usually 30 seconds or more and 600 seconds or less, and 60 seconds or more and 300 The second is better.
(3)交聯步驟S30 (3) Cross-linking step S30
以交聯劑處理染色步驟後的聚乙醇系樹脂膜之交聯處理,係基於藉由交聯進行耐水化或調整色相等目的而進行之處理,具體上可採用使染色步驟後之膜浸漬在含有交聯劑且收容於交聯槽中的處理液中之處理。該膜可浸漬在1個交聯槽中,也可依序浸漬在2個以上的交聯槽中。交聯處理時可進行單軸延伸處理。 The cross-linking treatment of the polyethanol resin film after the dyeing step with a cross-linking agent is based on the purpose of water resistance or color adjustment by cross-linking. Specifically, the film after the dyeing step can be immersed in It contains cross-linking agent and is contained in the treatment liquid in the cross-linking tank. The film can be immersed in one cross-linking tank or in two or more cross-linking tanks in sequence. Uniaxial stretching can be performed during cross-linking treatment.
交聯劑可列舉硼酸、乙二醛、戊二醛等,較佳可使用使用硼酸。亦可同時使用2種以上的交聯劑。交聯槽中收容的處理液中之硼酸的含量通常係在每100質量份之中占的0.1質量份以上15質量份以下,以1質量份以上10質量份以下為佳。二色性色素為碘時,交聯槽中收容的處理液較佳係除了含有硼酸以外,尚含有碘化物。交聯槽中收容的處理液中之碘化物的含量通常係在每100質量份之水中占0.1質量份以上15質量份以下,以5質量份以上12質量份以下為佳。碘化物可列舉碘化鉀、碘化鋅等。此外,也可使氯化鋅、氯化鈷、氯化鋯、硫代硫酸鈉、亞硫酸鉀、硫酸鈉等碘化物以外的化合物共存於交聯槽中。如上述,交聯槽中收容的處理液可含有鋅鹽。有2個以上的交聯槽時,係以收容在最後的交聯槽中之處理液含有鋅鹽為佳。 Examples of the crosslinking agent include boric acid, glyoxal, and glutaraldehyde, and boric acid can be preferably used. Two or more crosslinking agents can also be used at the same time. The content of boric acid in the treatment liquid contained in the cross-linking tank is usually 0.1 to 15 parts by mass per 100 parts by mass, preferably 1 part by mass to 10 parts by mass. When the dichroic dye is iodine, the treatment liquid contained in the crosslinking tank preferably contains iodide in addition to boric acid. The content of iodide in the treatment liquid contained in the cross-linking tank is usually 0.1 to 15 parts by mass per 100 parts by mass of water, preferably 5 parts by mass to 12 parts by mass. Examples of the iodide include potassium iodide and zinc iodide. In addition, compounds other than iodides, such as zinc chloride, cobalt chloride, zirconium chloride, sodium thiosulfate, potassium sulfite, and sodium sulfate, may coexist in the crosslinking tank. As described above, the treatment liquid contained in the crosslinking tank may contain zinc salt. When there are more than two cross-linking tanks, it is better that the treatment solution contained in the last cross-linking tank contains zinc salt.
浸漬膜時的交聯槽中收容的處理液之溫度通常係50℃以上85℃以下,以50℃以上70℃以下為佳,膜之浸漬時間通常係10秒以上600秒以下,以20秒以上300秒以下為佳。 The temperature of the treatment liquid contained in the cross-linking tank when the film is immersed is usually 50°C or more and 85°C or less, preferably 50°C or more and 70°C or less. The film immersion time is usually 10 seconds or more and 600 seconds or less, and 20 seconds or more. 300 seconds or less is better.
在交聯步驟S30中,交聯槽可以為2槽以上。此時,各交聯槽中收容的處理液之組成及溫度可以是相同,也可不同。交聯槽中收容的處理液可具有因應浸漬聚乙烯醇系樹脂膜的目的之交聯劑及碘化物等的濃度或溫度。用以藉由交聯所進行之耐水化之交聯處理及用以調整色相(補色)之交聯處理可各別在多個步驟(例如數個槽)中進行。 In the crosslinking step S30, the number of crosslinking tanks may be two or more. At this time, the composition and temperature of the treatment liquid contained in each crosslinking tank may be the same or different. The treatment liquid contained in the cross-linking tank may have a concentration or temperature of a cross-linking agent, iodide, etc. according to the purpose of impregnating the polyvinyl alcohol-based resin film. The cross-linking treatment for water resistance by cross-linking and the cross-linking treatment for adjusting hue (complementary color) can be performed in multiple steps (for example, several tanks) separately.
在實施用以藉由交聯而耐水化之交聯處理及用以調整色相(補色)之交聯處理兩者時,通常係將實施用以調整色相(補色)之交聯處理的槽配置在後段。補色槽中收容的處理液之溫度係例如10℃以上55℃以下,並以20℃以上50℃以下為佳。補色槽中收容的處理液中之交聯劑的含量,係在每100質量份的水中占例如1質量份以上5質量份以下。補色槽中收容的處理液中之碘化物的含量,係在每100質量份的水中占例如3質量份以上30質量份以下。如上述,補色槽中收容的處理液可含有鋅鹽。 When performing both the cross-linking treatment for water resistance by cross-linking and the cross-linking treatment for adjusting the hue (complementary color), the tank for the cross-linking treatment for adjusting the hue (complementary color) is usually arranged in After the paragraph. The temperature of the treatment liquid contained in the color correction tank is, for example, 10°C or more and 55°C or less, and preferably 20°C or more and 50°C or less. The content of the crosslinking agent in the treatment liquid contained in the color correction tank is, for example, 1 part by mass to 5 parts by mass per 100 parts by mass of water. The content of iodide in the treatment liquid contained in the color correction tank is, for example, 3 parts by mass or more and 30 parts by mass or less per 100 parts by mass of water. As mentioned above, the treatment liquid contained in the complementary color tank may contain zinc salt.
如上述,製造偏光片時,從膨潤步驟S10之前至交聯步驟S30為止的任何1個或2個以上的階段中對聚乙烯醇系樹脂膜進行單軸延伸處理(延伸步驟,第1圖)。從提高二色性色素的染色性之觀點,染色步驟中使用的膜係以至少施加某種程度的單軸延伸處理之膜為佳,或者,在染色處理時進行單軸延伸處理,以取代染色處理前的單軸延伸處理,或與染色處理前的單軸延伸處理一起進行。 As described above, when manufacturing a polarizer, the polyvinyl alcohol-based resin film is uniaxially stretched in any one or two or more stages from before the swelling step S10 to the crosslinking step S30 (stretching step, Fig. 1). From the viewpoint of improving the dyeability of dichroic pigments, the film used in the dyeing step is preferably a film with at least a certain degree of uniaxial stretching treatment, or uniaxial stretching treatment during dyeing treatment instead of dyeing The uniaxial stretching treatment before the treatment or together with the uniaxial stretching treatment before the dyeing treatment.
單軸延伸處理可以是在空中進行延伸的乾式延伸、在槽中進行延伸的濕式延伸之任一種,也可進行此二種延伸。單軸延伸處理雖然可以係在2個軋輥間以周速差進行縱向單軸延伸的輥間延伸、熱輥延伸、拉幅延伸等,但以包括輥間延伸為佳。以原料膜作成基準的延伸倍率(在 2個以上的階段中進行延伸處理時為該等的累計延伸倍率)係約3倍以上8倍以下。為賦予良好的偏光特性,延伸倍率係以4倍以上為佳,並以5倍以上為更佳。 The uniaxial stretching treatment may be either dry stretching in the air or wet stretching in the groove, or both types of stretching may be performed. The uniaxial stretching treatment may be inter-roll stretching, hot roll stretching, and tenter stretching in which longitudinal uniaxial stretching is performed between two rolls at a circumferential speed difference, but it is preferable to include inter-roll stretching. Stretching magnification based on the raw film made (in When stretching is performed in two or more stages, the cumulative stretching magnification) is about 3 times or more and 8 times or less. In order to impart good polarization characteristics, the extension ratio is preferably 4 times or more, and more preferably 5 times or more.
(4)清洗步驟S40 (4) Cleaning step S40
本步驟中的清洗處理係基於去除附著在聚乙烯醇系樹脂膜之多餘交聯劑或二色性色素等藥劑之目的而視需要實施之處理,該處理係使用含水的清洗液來清洗交聯步驟後之聚乙烯醇系樹脂膜。具體上可採用使交聯步驟後的聚乙烯醇系樹脂膜浸漬在清洗槽中收容的處理液(清洗液)中之處理。該膜可浸漬在1個清洗槽中,也可依序浸漬在2個以上的槽中。或者,清洗處理可以是對交聯步驟後的聚乙醇系樹脂膜噴霧以沖淋的方式噴霧清洗液,也可組合上述的浸漬與噴霧。 The cleaning treatment in this step is based on the purpose of removing the excess crosslinking agent or dichroic pigment attached to the polyvinyl alcohol resin film, and is performed as needed. This treatment uses a water-containing cleaning solution to clean the crosslinking The polyvinyl alcohol resin film after the step. Specifically, a process of immersing the polyvinyl alcohol-based resin film after the cross-linking step in a treatment liquid (cleaning liquid) contained in a cleaning tank can be adopted. The film can be immersed in one cleaning tank or in two or more tanks in sequence. Alternatively, the cleaning treatment may be to spray a cleaning solution by showering on the polyethanol-based resin film after the crosslinking step, or a combination of the above-mentioned dipping and spraying.
清洗液可以是水(例如純水),另外也可以是已添加如醇類的水溶性有機溶劑之水溶液。清洗液的溫度可以係例如紑5℃以上40℃以下。 The cleaning liquid may be water (for example, pure water), or may be an aqueous solution to which a water-soluble organic solvent such as alcohol has been added. The temperature of the cleaning solution can be, for example, 5°C or more and 40°C or less.
清洗步驟S40為可選擇的步驟,也可省略,也可如後述的在乾燥步驟S50中進行清洗處理。宜對清洗步驟S40之後的膜進行乾燥步驟S50。 The cleaning step S40 is an optional step and may be omitted, and the cleaning process may be performed in the drying step S50 as described later. It is advisable to perform a drying step S50 on the film after the cleaning step S40.
(5)乾燥步驟S50 (5) Drying step S50
乾燥步驟S50係用以使清洗步驟S40後之聚乙烯醇系樹脂膜乾燥的區帶。在連續運送清洗步驟S40後之聚乙烯醇系樹脂膜的同時,將該膜導入乾燥步驟S50中而施加乾燥處理,藉此獲得偏光片。 The drying step S50 is a zone for drying the polyvinyl alcohol resin film after the washing step S40. While continuously conveying the polyvinyl alcohol-based resin film after the cleaning step S40, the film is introduced into the drying step S50 to be dried, thereby obtaining a polarizer.
乾燥處理可利用膜之乾燥方式(加熱方式)進行。乾燥手段的一合適例為乾燥爐。乾燥爐宜為可控制爐內溫度者。乾燥爐係例如可藉由供應熱風等而提高爐內溫度之熱風爐。此外,藉由乾燥手段所進行的乾燥處理可以是使清洗步驟S40後之聚乙烯醇系樹脂膜密合在具有凸面的1個或2個以上之加熱體之處理,或利用加熱器將該膜加熱的處理。 The drying process can be performed by the drying method (heating method) of the film. A suitable example of the drying means is a drying furnace. The drying furnace should be capable of controlling the temperature in the furnace. The drying furnace is, for example, a hot air furnace that can increase the temperature in the furnace by supplying hot air or the like. In addition, the drying treatment performed by the drying means may be a treatment in which the polyvinyl alcohol resin film after the cleaning step S40 is adhered to one or more heating bodies having a convex surface, or the film may be heated by a heater. Heat treatment.
上述加熱體可列舉內部具備熱源(例如溫水等熱媒或紅外線加熱器)且可提高表面溫度的輥(例如兼作為熱輥的導輥)。上述加熱器可列舉紅外線加熱器、鹵素加熱器、平板加熱器等。 Examples of the heating body include a roller (for example, a guide roller that also serves as a heat roller) that includes a heat source (for example, a heat medium such as warm water or an infrared heater) and can increase the surface temperature. Examples of the above-mentioned heater include infrared heaters, halogen heaters, plate heaters, and the like.
乾燥處理的溫度(例如乾燥爐的爐內溫度、熱輥的表面溫度等)通常係30℃以上100℃以下,並以50℃以上90℃以下為佳。乾燥時間並無特別的限制,係例如30秒以上600秒以下。 The temperature of the drying treatment (for example, the furnace temperature of the drying furnace, the surface temperature of the hot roll, etc.) is usually 30°C or more and 100°C or less, and preferably 50°C or more and 90°C or less. The drying time is not particularly limited, and is, for example, 30 seconds or more and 600 seconds or less.
經過以上的步驟,可獲得於經單軸延伸之聚乙烯醇系樹脂膜吸附配向有二色性色素之偏光片。 After the above steps, a polarizer with dichroic pigments adsorbed and aligned on a uniaxially stretched polyvinyl alcohol resin film can be obtained.
所得的偏光片可例如直接運送至下一個偏光板製作步驟(將熱塑性樹脂膜貼合在偏光片的一面或兩面之步驟)。 The obtained polarizer can be directly transported, for example, to the next polarizing plate manufacturing step (a step of attaching a thermoplastic resin film to one or both sides of the polarizer).
<偏光板> <Polarizer>
本發明的另一形態之偏光板係具備上述的偏光片、設在該偏光的一面之第1熱塑性樹脂膜及設在另一面之第2熱塑性樹脂膜。以下參照圖式同時說明偏光板。第2圖顯示的偏光板100係在偏光片101的一面具備第1熱塑性樹脂膜102,於另一面具備第2熱塑性樹脂膜103。以下將第1熱塑性樹脂膜與第2熱塑性樹脂膜統稱為熱塑性樹脂膜。
A polarizing plate according to another aspect of the present invention includes the above-mentioned polarizer, a first thermoplastic resin film provided on one side of the polarized light, and a second thermoplastic resin film provided on the other side. The polarizing plate will be described with reference to the drawings. The
熱塑性樹脂膜可以是包含下述者之透明樹脂膜:熱塑性樹脂例如鏈狀聚烯烴系樹脂(聚丙烯系樹脂等)、環狀聚烯烴系樹脂(降冰片烯系樹脂等)之聚烯烴系樹脂;如三乙酸纖維素或二乙酸纖維素的纖維素酯系樹脂;如聚對苯二甲酸乙二酯、聚萘二甲酸乙二酯、聚對苯二甲酸丁二酯的聚酯系樹脂;聚碳酸酯系樹脂;如聚甲基丙烯酸甲酯系樹脂的(甲基)丙烯酸系樹脂;或此等的混合物、共聚合物等。 The thermoplastic resin film may be a transparent resin film containing the following: a thermoplastic resin such as a polyolefin resin such as a chain polyolefin resin (polypropylene resin, etc.), a cyclic polyolefin resin (norbornene resin, etc.) ; Cellulose ester resins such as cellulose triacetate or cellulose diacetate; polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate resin; (meth)acrylic resin such as polymethyl methacrylate resin; or these mixtures, copolymers, etc.
第1熱塑性樹脂膜與第2熱塑性樹脂膜之任一者或兩者,可以是兼具如相位差膜、增亮膜的光學功能之保護膜。例如,可藉由將包含上述材料之透明樹脂膜延伸(單軸延伸或二軸延伸等)或在該膜上形成液晶層等,而作成賦予任意相位差值的相位差膜。 Either or both of the first thermoplastic resin film and the second thermoplastic resin film may be a protective film having optical functions such as a retardation film and a brightness enhancement film. For example, by stretching a transparent resin film containing the above-mentioned materials (uniaxial stretching, biaxial stretching, etc.) or forming a liquid crystal layer on the film, a retardation film that gives an arbitrary retardation value can be produced.
在熱塑性樹脂膜之與偏光片101為相反側之表面可形成如硬塗層、防眩層、抗反射層、抗靜電層、防污層的表面處理層(塗布層)。 A surface treatment layer (coating layer) such as a hard coat layer, an anti-glare layer, an anti-reflection layer, an anti-static layer, and an anti-fouling layer can be formed on the surface of the thermoplastic resin film opposite to the polarizer 101.
就薄化偏光板100而言,雖然熱塑性樹脂膜之厚度係以較薄為佳,但太薄時會降低強度而趨使加工性變差,故以5至150μm為佳,以5至100μm為更佳,並以10至50μm為又更佳。
Regarding the thinned
偏光板100可藉由將熱塑性樹脂膜透過接著劑而分別貼合(積層)在偏光片101的兩面而得到。偏光片101與熱可性樹脂膜間的貼合時使用的接著劑,可列舉紫外線硬化性接著劑等活性能量線硬化性接著劑、聚乙烯醇系樹脂的水溶液或已在其中調配交聯劑的水溶液、氨酯系乳液接著劑等水性接著劑。將熱塑性樹脂膜貼合在偏光片101的兩面時,形成2層接著劑層的接著劑可以係相同種類,也可不同種類。例如在兩面貼
合熱塑性樹脂膜時,可在一面使用水性接著劑貼合,在另一面使用活性能量線硬化性接著劑貼合。紫外線硬化型接著劑可以係自由基聚合性的(甲基)丙烯酸系化合物與光自由基聚合起始劑的混合物,或陽離子聚合性的環氧化合物與光陽離子聚合起始劑之混合物等。此外,可合併使用陽離子聚合性的環氧化合物與自由基聚合性的(甲基)丙烯酸系化合物,也可合併使用光陽離子聚合起始劑與光自由基聚合起始劑作為起始劑。
The
使用活性能量線硬化性接著劑時,係藉由在貼合後照射活性能量線而使接著劑硬化。活性能量線之光源並無特別的限制,但以於波長400nm以下具有發光分布之活性能量線(紫外線)為佳,具體上較佳可使用低壓水銀燈、中壓水銀燈、高壓水銀燈、超高壓水銀燈、化學燈、黑光燈、微波激發水銀燈、鹵化金屬燈等。 When an active energy ray-curable adhesive is used, the adhesive is cured by irradiating the active energy ray after bonding. The light source of the active energy line is not particularly limited, but the active energy line (ultraviolet) with a luminous distribution below the wavelength of 400nm is preferred. Specifically, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, Chemical lamp, black light lamp, microwave excited mercury lamp, metal halide lamp, etc.
為提升偏光片101與熱塑性樹脂膜的接著性,可在偏光片101與熱塑性樹脂膜的貼合前,於偏光片101及/或熱塑性樹脂膜的貼合面施加電暈處理、火焰處理、電漿處理、紫外線照射處理、底漆塗布處理、皂化處理等表面處理。 In order to improve the adhesion between the polarizer 101 and the thermoplastic resin film, before the polarizer 101 and the thermoplastic resin film are bonded, corona treatment, flame treatment, and electrical treatment can be applied to the bonding surface of the polarizer 101 and/or the thermoplastic resin film. Surface treatment such as slurry treatment, ultraviolet irradiation treatment, primer coating treatment, saponification treatment, etc.
雖然可如上述般,藉由在屬於單層膜之偏光片101貼合熱塑性樹脂膜而製作本發明的偏光板100,但並不侷限於此方法。亦可如日本特開2009-98653號公報所述般,藉由利用基材膜的方法製作。後者的方法係有利於獲得具有薄膜的偏光片(偏光片層)的偏光板者,其包括例如下列的步驟。
Although it is possible to manufacture the
樹脂層形成步驟,係在基材膜的至少一面塗布含有聚乙烯醇系樹脂的塗布液之後使其乾燥,藉此形成聚乙烯醇系樹脂層而得到積層膜、 The resin layer forming step is to apply a coating liquid containing a polyvinyl alcohol-based resin to at least one side of the base film and then dry it to form a polyvinyl alcohol-based resin layer to obtain a laminated film,
延伸步驟,係將積層膜延伸而得到延伸膜、 The stretching step is to stretch the laminated film to obtain a stretched film,
染色步驟,係藉由用二色性色素將延伸膜之聚乙烯醇系樹脂層染色而形成偏光片層(相當於偏光片),藉此得到偏光性積層膜、 In the dyeing step, a polarizer layer (equivalent to a polarizer) is formed by dyeing the polyvinyl alcohol-based resin layer of the stretched film with a dichroic dye to obtain a polarizing laminated film,
第1貼合步驟,係使用接著劑將熱塑性樹脂膜貼合在偏光性積層膜的偏光片層而得到貼合膜、 In the first bonding step, the thermoplastic resin film is bonded to the polarizer layer of the polarizing laminated film using an adhesive to obtain a bonded film,
剝離步驟,係從貼合膜將基材膜剝離去除而得到一面附有熱塑性樹脂膜之偏光板。 The peeling step is to peel and remove the base film from the laminated film to obtain a polarizing plate with a thermoplastic resin film on one side.
其中,在上述染色步驟中,藉由使含有二色性色素的處理液含有鋅鹽,可使偏光片含有鋅元素。 Among them, in the above-mentioned dyeing step, by making the treatment liquid containing the dichroic dye contain zinc salt, the polarizer can be made to contain zinc element.
將熱塑性樹脂膜積層在偏光片101層(偏光片)的兩面時,更包含第2貼合步驟,該第2貼合步驟係使用接著劑將第2熱塑性樹脂膜貼合在一面附第1熱塑性樹脂膜的偏光板之偏光片表面。 When the thermoplastic resin film is laminated on both sides of the 101 polarizer (polarizer), a second bonding step is included. The second bonding step uses an adhesive to bond the second thermoplastic resin film on one side with the first thermoplastic The surface of the polarizer of the polarizer of the resin film.
利用基材膜的上述方法中,獲得偏光性積層膜之染色步驟(例如,獲得偏光性積層膜的染色步驟中之交聯步驟後或清洗步驟後)中可包含乾燥步驟。上述偏光性積層膜、一面附熱塑性樹脂膜之偏光板、及經第2貼合步驟而得的兩面附熱塑性樹脂膜之偏光板中所含的偏光片或從此等中分離之偏光片,均屬於本發明的偏光片。 In the above method using the base film, the dyeing step for obtaining the polarizing laminated film (for example, after the crosslinking step in the dyeing step for obtaining the polarizing laminated film or after the washing step) may include a drying step. The polarizers contained in the above-mentioned polarizing laminated film, the polarizer with a thermoplastic resin film on one side, and the polarizer with the thermoplastic resin film on both sides obtained through the second bonding step, or the polarizers separated from them, belong to The polarizer of the present invention.
偏光板在耐久性試驗前之發光因數校正單體穿透率(Ty)例如可超過40.5%,發光因數校正單體穿透率(Ty)之下限值係以41.0%以上為佳,上限值通常係50%以下,並以47%以下為佳。 The luminous factor correction monomer transmittance (Ty) of the polarizer before the durability test can exceed 40.5%, for example, the lower limit of the luminous factor correction monomer transmittance (Ty) is preferably 41.0% or more, the upper limit The value is usually below 50%, and preferably below 47%.
偏光板的△Ty例如可以為4%以下,以3.5%以下為佳。 The ΔTy of the polarizing plate may be 4% or less, and preferably 3.5% or less.
偏光板在耐久性試驗前之發光因數校正單體穿透率(Ty)為41.5%時,發光因數校正偏光度(Py)例如可超過99.980,發光因數校正單體穿透率(Ty)為41.5%時的發光因數校正偏光度(Py)之下限值,係以99.985以上為佳。發光因數校正偏光度(Py)可依照後述的實施例欄中說明的方法測定。 When the luminescence factor correction monomer transmittance (Ty) of the polarizer before the durability test is 41.5%, the luminescence factor correction polarization degree (Py) can exceed 99.980, for example, and the luminescence factor correction monomer transmittance (Ty) is 41.5 The lower limit of the luminous factor correction polarization (Py) at% is preferably above 99.985. The luminous factor correction polarization (Py) can be measured according to the method described in the column of Examples described later.
偏光板在耐久性試驗前之於波長500nm以上600nm以下的TD穿透率之極大值(TDmax)例如可為0.01以下,以0.008以下為佳。 The maximum value (TDmax) of the TD transmittance at a wavelength of 500 nm or more and 600 nm or less of the polarizing plate before the durability test may be, for example, 0.01 or less, preferably 0.008 or less.
偏光板的△TD例如可為0.014以下,以0.01以下為佳。 The ΔTD of the polarizing plate may be 0.014 or less, and preferably 0.01 or less.
偏光板在耐久性試驗前之正交色相a例如可為2.6以下,以1以下為佳。 The cross hue a of the polarizing plate before the durability test may be, for example, 2.6 or less, preferably 1 or less.
偏光板的△a例如可為2.5以下,以2.45以下為佳。 The Δa of the polarizing plate may be 2.5 or less, preferably 2.45 or less.
偏光板可使用於顯示裝置。顯示裝置可以係液晶顯示裝置、有機EL顯示裝置等的任何一種,但以液晶顯示裝置為佳。液晶顯示裝置具備作為圖像顯示元件的液晶單元之液晶面板及背光。建構液晶顯示裝置時,偏光板可用作為配置在觀看側的偏光板,也可用作為配置在背光側上的偏光板,亦可用作為觀看側及背光側兩者的偏光板。 The polarizing plate can be used in a display device. The display device may be any of a liquid crystal display device, an organic EL display device, etc., but a liquid crystal display device is preferred. The liquid crystal display device includes a liquid crystal panel and a backlight as a liquid crystal cell as an image display element. When constructing a liquid crystal display device, the polarizing plate can be used as a polarizing plate arranged on the viewing side, as a polarizing plate arranged on the backlight side, or as a polarizing plate on both the viewing side and the backlight side.
偏光板適合於依序具備偏光板、貼合在偏光板的靠第1熱塑性樹脂膜側的表面之透光性構件及貼合在偏光板的靠第2熱塑性樹脂膜側的表面之顯示裝置的車載用顯示裝置。透光性構件可以是玻璃板或具有透光性的樹脂膜等。 The polarizing plate is suitable for display devices that are sequentially provided with a polarizing plate, a translucent member attached to the surface of the polarizing plate on the side of the first thermoplastic resin film, and a display device attached to the surface of the polarizing plate on the side of the second thermoplastic resin film. In-vehicle display device. The light-transmitting member may be a glass plate, a resin film having light-transmitting properties, or the like.
以下顯示實施例以更具體地說明本發明,但本發明並非侷限於此等例者。 Examples are shown below to explain the present invention more specifically, but the present invention is not limited to these examples.
(實施例) (Example)
〔耐久性試驗〕 〔Durability test〕
從製造的偏光板中切出40mm×40mm的測試片,使用厚度25μm的丙烯酸系黏著劑將40mm×40mm的無鹼玻璃貼合在切出的偏光板之兩面。將所得的兩面貼合玻璃之偏光板作為試樣以進行於波長500nm以上600nm以下的TD穿透率之極大值(TDmax)、發光因數校正單體穿透率(Ty)、發光因數校正校正偏光度(Py)及正交色相a之測定。接著,在105℃的烘箱中將經測定的試樣片加熱1000小時。對自烘箱中取出之試樣進行於波長500nm以上600nm以下的TD穿透率之極大值(TDmax)、發光因數校正單體穿透率(Ty)及正交色相a之光學特性的測定。將在耐久性試驗後與耐久性試驗前之發光因數校正單體穿透率(Ty)、發光因數校正偏光度(Py)及正交色相a之測定值的差之絶對值記載於表1中。 A test piece of 40 mm×40 mm was cut out from the manufactured polarizing plate, and an alkali-free glass of 40 mm×40 mm was bonded to both sides of the cut out polarizing plate using an acrylic adhesive with a thickness of 25 μm . The obtained polarizing plate with laminated glass on both sides was used as a sample to carry out the maximum value of TD transmittance (TDmax), luminescence factor correction monomer transmittance (Ty), luminescence factor correction and polarization correction at a wavelength of 500nm or more and 600nm or less Determination of degree (Py) and orthogonal hue a. Next, the measured sample piece was heated in an oven at 105°C for 1000 hours. The samples taken out of the oven were measured for the maximum value of TD transmittance (TDmax), the transmittance of luminous factor correction monomer (Ty), and the optical properties of orthogonal hue a at a wavelength of 500nm above and below 600nm. The absolute values of the difference between the luminous factor corrected monomer transmittance (Ty), luminous factor corrected polarization (Py), and the measured values of orthogonal hue a after the durability test and before the durability test are recorded in Table 1. .
〔鋅含量的測定〕 [Determination of zinc content]
偏光片中的鋅含量之測定係依下述方式進行。 The measurement of the zinc content in the polarizer was carried out in the following manner.
在經精確量秤的偏光片中加入硝酸,將經Milestone General製造的微波試料前處理裝置(ETHOS D)酸分解而得之溶液作為測定液。鋅濃度係藉由安捷倫科技製ICP發光分光分析計(5110 ICP-OES)定量測定液之鋅濃度,計算出相對於偏光片的質量之鋅的質量。 Nitric acid was added to the accurately weighed polarizer, and the solution obtained by acid decomposition with the microwave sample pretreatment device (ETHOS D) manufactured by Milestone General was used as the measurement liquid. The zinc concentration is determined by the ICP spectrophotometer (5110 ICP-OES) manufactured by Agilent Technologies to quantitatively measure the zinc concentration of the solution, and calculate the mass of zinc relative to the mass of the polarizer.
〔於波長500nm以上600nm以下的TD穿透率之極大值(TDmax)〕 〔Maximum value of TD transmittance (TDmax) at wavelength of 500nm above 600nm below
利用附積分球分光光度計〔日本分光(股)製的「V7100」〕對偏光板測定於波長380至780nm的範圍之TD穿透率,求得於波長500nm以上600nm以下中為最大之TD穿透率。 Using a spectrophotometer with an integrating sphere ("V7100" manufactured by JASCO Corporation), measure the TD transmittance of the polarizer in the wavelength range of 380 to 780nm, and obtain the maximum TD transmittance in the wavelength range of 500nm to 600nm. Transmittance.
〔發光因數校正單體穿透率(Ty)及發光因數校正偏光度(Py)〕 [Luminescence factor correction monomer transmittance (Ty) and luminescence factor correction polarization degree (Py)]
利用附積分球分光光度計〔日本分光(股)製的「V7100」〕對偏光板測定於波長380至780nm之範圍的MD穿透率及TD穿透率, Using a spectrophotometer with an integrating sphere ("V7100" manufactured by JASCO Corporation) on a polarizing plate, measure the MD transmittance and TD transmittance in the wavelength range of 380 to 780 nm,
並依據下述式計算出於各波長的單體穿透率及偏光度: And calculate the monomer transmittance and polarization degree of each wavelength according to the following formula:
單體穿透率(%)=(MD+TD)/2 Single penetration rate (%)=(MD+TD)/2
偏光度(%)={(MD-TD)/(MD+TD)}×100 Polarization (%)=((MD-TD)/(MD+TD))×100
「MD穿透率」係指從格蘭湯普森稜鏡(Glan-Thompson prism)發出的偏光方向與偏光板的穿透軸為平行時之穿透率,在上述式中以「MD」表示。此外,「TD穿透率」係指從格蘭湯普森稜鏡發出的偏光方向與偏光板的穿透軸為垂直時之穿透率,在上述式中以「TD」表示。 "MD transmittance" refers to the transmittance when the direction of polarized light emitted from Glan-Thompson prism is parallel to the transmission axis of the polarizer, and is represented by "MD" in the above formula. In addition, "TD transmittance" refers to the transmittance when the direction of polarized light emitted from Glan Thompson's beam is perpendicular to the transmission axis of the polarizer, and is represented by "TD" in the above formula.
藉由JIS Z 8701:1999「顏色的表示方法-XYZ表色體系及X10Y10Z10表色體系」之2度視角(C光源)對所得的單體穿透率及偏光度進行發光因數校正,求得發光因數校正單體穿透率(Ty)及發光因數校正偏光度(Py)。 According to JIS Z 8701: 1999 "Method of Representing Color-XYZ Color System and X10Y10Z10 Color System", the 2 degree viewing angle (C light source) is used to correct the luminous factor of the obtained monomer transmittance and polarization to obtain the luminescence Factor correction monomer transmittance (Ty) and luminescence factor correction polarization (Py).
〔正交色相a〕 [Orthogonal Hue a]
正交色相a係Lab表色體系中的a值,係利用附積分球分光光度計〔日本分光(股)製的「V7100」〕測定標準光。如JIS K 5981:2006「合成樹脂粉體塗膜」之「5.5促進耐候性試驗」中所述,Lab表色體系係以Hunter的明度指數L和色相a及b表示者,明度指數L與色相a及b之值係從JIS Z 8722:2009「顏色之測定方法-反射及穿透物體色」中規定的三刺激值X、Y及Z,並依下述式計算。 Orthogonal hue a is the value of a in the Lab color system. Standard light is measured using a spectrophotometer with integrating sphere ("V7100" manufactured by JASCO Corporation). As stated in JIS K 5981: 2006 "Synthetic resin powder coating film", "5.5 Accelerated weather resistance test", the Lab color system is represented by Hunter's lightness index L and hue a and b. Lightness index L and hue The values of a and b are based on the tristimulus values X, Y, and Z specified in JIS Z 8722:2009 "Methods of Color Measurement-Reflected and Penetrated Object Color", and are calculated according to the following formula.
L=10Y1/2 L=10Y 1/2
a=17.5(10.2X-Y)/Y1/2 a=17.5(10.2XY)/Y 1/2
b=7.0(Y-0.847Z)/Y1/2。 b=7.0(Y-0.847Z)/Y 1/2 .
Lab表色體系中,色相a值及b值可表示對應於彩度的位置,色相a值增加則色相變成紅色系,色相b值增加則色相變成黃色系。此外,越接近0時表示兩者越接近於無色。 In the Lab color system, the hue a value and b value can indicate the position corresponding to the saturation. When the hue a value increases, the hue becomes red, and the hue b value increases, and the hue becomes yellow. In addition, the closer to 0, the closer the two are to colorless.
<實施例1> <Example 1>
將厚度30μm的長條聚乙烯醇(PVA)胚膜〔Kuraray(股)製之商品名「Kuraray Poval Film VF-PE # 3000、平均聚合度2400、皂化度99.9莫耳%以上〕一邊從膜捲中抽出一邊連續地運送,使其以浸漬時間80秒浸漬在收容有20℃的純水之膨潤槽中(膨潤步驟)。然後,將從膨潤槽中拉出之膜以浸漬時間130秒浸漬在收容有碘化鉀/硼酸/水為1.3/0.3/100(質量比)之含碘的30℃處理液之染色槽中(染色步驟)。接著,將從染色槽中拉出之膜以浸漬時間50秒浸漬在收容有碘化鉀/硼酸/水為13.9/3.0/100(質量比)的56℃處理液的交聯槽中(交聯步驟)。繼續將從交聯槽中拉出之膜以浸漬時間10秒浸漬在收容有碘化鉀 /硼酸/硝酸鋅六水合物/水為9.0/3.0/2.0/100(質量比)的46℃處理液的補色槽中(補色步驟)。 A long strip of polyvinyl alcohol (PVA) embryo film with a thickness of 30 μm (trade name "Kuraray Poval Film VF-PE # 3000, average degree of polymerization 2400, saponification degree of 99.9 mol% or more) manufactured by Kuraray) The film roll is drawn out and transported continuously, and immersed in a swelling tank containing pure water at 20°C for an immersion time of 80 seconds (swelling step). Then, the film drawn from the swelling tank is immersed for 130 seconds Immerse in a dyeing tank (dyeing step) containing an iodine-containing treatment solution containing potassium iodide/boric acid/water of 1.3/0.3/100 (mass ratio) (dyeing step). Next, the film drawn from the dyeing tank is immersed for time Soak for 50 seconds in a cross-linking tank containing a 56°C treatment solution with a potassium iodide/boric acid/water ratio of 13.9/3.0/100 (mass ratio) (cross-linking step). Continue to immerse the film drawn from the cross-linking tank for immersion It was immersed in a color correction tank containing a 46°C treatment solution of potassium iodide/boric acid/zinc nitrate hexahydrate/water (mass ratio) of 9.0/3.0/2.0/100 (mass ratio) for 10 seconds (color correction step).
接著,將從交聯槽中拉出之膜以浸漬時間10秒浸漬在收容有70℃的純水之清洗槽中(清洗步驟)之後,接著藉由導入於80℃的加熱爐中,以浸漬時間150秒進行乾燥處理(乾燥步驟)而獲得厚度12μm的偏光片。在膨潤步驟、染色步驟、交聯步驟、補色步驟及清洗步驟中,藉由在槽中的輥間延伸,依表1所示之倍率進行縱向單軸延伸。以胚膜作為基準的總延伸倍率為6.0倍。對所得的偏光片進行鋅含量的測定。將結果顯示於表1中。 Next, the film drawn from the cross-linking tank was immersed in a washing tank containing pure water at 70°C for an immersion time of 10 seconds (washing step), and then introduced into a heating furnace at 80°C to immerse The drying process (drying step) was performed for 150 seconds to obtain a polarizer with a thickness of 12 μm . In the swelling step, the dyeing step, the cross-linking step, the color correction step, and the cleaning step, the longitudinal uniaxial extension is performed at the magnification shown in Table 1 by extending between the rollers in the tank. The total extension magnification based on embryonic membrane is 6.0 times. The zinc content of the obtained polarizer was measured. The results are shown in Table 1.
<實施例2> <Example 2>
除了將補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/硝酸鋅六水合物/水之質量比變更為9.0/3.0/3.0/100以外,其餘以和實施例1同樣的操作製成厚度12μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/zinc nitrate hexahydrate/water in the treatment solution contained in the color complementary tank in the color complementary step was changed to 9.0/3.0/3.0/100, the rest was prepared by the same operation as in Example 1. Polarizer with a thickness of 12 μm .
<實施例3> <Example 3>
除了將偏光片補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/硝酸鋅六水合物/水之質量比變更為9.0/3.0/4.0/100以外,其餘以和實施例1同樣的操作製成厚度12μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/zinc nitrate hexahydrate/water in the treatment solution contained in the color correction tank in the color correction step of the polarizer is changed to 9.0/3.0/4.0/100, the rest is the same as in Example 1. A polarizer with a thickness of 12 μm is manufactured by operation.
<比較例1> <Comparative Example 1>
除了將補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/水之質量比變更為9.0/3.0/100以外,其餘以和實施例1同樣的操作製成厚度12μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/water in the treatment solution contained in the color compensation tank in the color compensation step was changed to 9.0/3.0/100, the remaining operations were the same as in Example 1 to produce a polarizer with a thickness of 12 μm .
<比較例2> <Comparative Example 2>
除了將補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/硝酸鋅六水合物/水之質量比變更為9.0/3.0/1.0/100以外,其餘以和實施例1同樣的操作製成厚度12μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/zinc nitrate hexahydrate/water in the treatment solution contained in the color compensation tank in the color compensation step was changed to 9.0/3.0/1.0/100, the rest was prepared by the same operation as in Example 1. Polarizer with a thickness of 12 μm .
<比較例3> <Comparative Example 3>
除了將偏光片補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/硝酸鋅六水合物/水之質量比變更為9.0/3.0/5.0/100以外,其餘以和實施例1同樣的操作製成厚度12μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/zinc nitrate hexahydrate/water in the treatment solution contained in the color correction tank in the color correction step of the polarizer is changed to 9.0/3.0/5.0/100, the rest is the same as in Example 1. A polarizer with a thickness of 12 μm is manufactured by operation.
<比較例4> <Comparative Example 4>
將厚度75μm的長條聚乙烯醇(PVA)胚膜〔Kuraray(股)製之商品名「Kuraray Poval Film VF-PS # 7500、平均聚合度2400、皂化度99.9莫耳%以上〕一邊從膜捲中抽出一邊連續地運送,以浸漬時間150秒使其浸漬在收容有25℃的純水之處理液中(膨潤步驟)。然後,將從膨潤槽中拉出之膜以浸漬時間170秒浸漬在收容有碘化鉀/硼酸/水為2.0/0.6/100(質量比)的含碘之30℃處理液之染色槽中(染色步驟)。接著,將從染色槽中拉出之膜以浸漬時間80秒浸漬在收容有碘化鉀/硼酸/水為15.4/4.0/100(質量比)的56℃處理液的交聯槽中(交聯步驟)。繼續將從交聯槽中拉出之膜以浸漬時間10秒浸漬在收容有碘化鉀/硼酸/水為15.4/4.0/100(質量比)的40℃處理液的補色槽中(補色步驟)。 A strip of polyvinyl alcohol (PVA) embryo film with a thickness of 75 μm (trade name "Kuraray Poval Film VF-PS # 7500, average degree of polymerization 2400, saponification degree of 99.9 mol% or more) manufactured by Kuraray] The film roll is drawn out and transported continuously, and immersed in a treatment solution containing pure water at 25°C for an immersion time of 150 seconds (swelling step). Then, the film drawn from the swelling tank is immersed for 170 seconds Immerse in a dyeing tank (dyeing step) containing a 30°C treatment solution containing potassium iodide/boric acid/water at a ratio of 2.0/0.6/100 (mass ratio) of potassium iodide/boric acid/water (dyeing step). Next, the film drawn from the dyeing tank is immersed for time Soak for 80 seconds in a cross-linking tank containing a 56°C treatment solution of potassium iodide/boric acid/water (mass ratio) of 15.4/4.0/100 (mass ratio) (cross-linking step). Continue to immerse the film drawn from the cross-linking tank It was immersed in a color correction tank containing a 40°C treatment solution with potassium iodide/boric acid/water ratio of 15.4/4.0/100 (mass ratio) for 10 seconds (color correction step).
接著,將從交聯槽中拉出之膜以浸漬時間10秒浸漬在收容有含8℃純水之清洗槽中(清洗步驟)之後,接著導入於80℃的加熱爐中,藉此以浸漬時間300秒進行乾燥處理(乾燥步驟)而獲得厚度28μm 的偏光片。在膨潤步驟、染色步驟、交聯步驟、補色步驟及清洗步驟中,藉由在槽中的輥間延伸,依表1顯示之倍率進行縱向單軸延伸。以胚膜作為基準的總延伸倍率為6.0倍。 Next, the film drawn from the cross-linking tank was immersed in a washing tank containing pure water at 8°C for an immersion time of 10 seconds (washing step), and then introduced into a heating furnace at 80°C for immersion The drying process (drying step) was performed for 300 seconds to obtain a polarizer having a thickness of 28 μm . In the swelling step, the dyeing step, the cross-linking step, the color correction step, and the cleaning step, the longitudinal uniaxial extension is performed according to the magnification shown in Table 1 by extending between the rollers in the tank. The total extension magnification based on embryonic membrane is 6.0 times.
<比較例5> <Comparative Example 5>
除了將補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/硝酸鋅六水合物/水之質量比變更為9.0/3.0/5.0/100以外,其餘以和比較例4同樣的操作製成厚度28μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/zinc nitrate hexahydrate/water in the treatment solution contained in the color compensation tank in the color compensation step was changed to 9.0/3.0/5.0/100, the rest was prepared by the same operation as in Comparative Example 4. A polarizer with a thickness of 28 μm .
<比較例6> <Comparative Example 6>
除了將補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/硝酸鋅六水合物/水之質量比變更為9.0/3.0/7.0/100以外,其餘以和比較例4同樣的操作製成厚度28μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/zinc nitrate hexahydrate/water in the treatment solution contained in the color compensation tank in the color compensation step was changed to 9.0/3.0/7.0/100, the rest was prepared by the same operation as in Comparative Example 4. A polarizer with a thickness of 28 μm .
<比較例7> <Comparative Example 7>
將厚度60μm的長條聚乙烯醇(PVA)胚膜〔Kuraray(股)製之商品名「Kuraray Poval Film VF-PS # 6000、平均聚合度2400、皂化度99.9莫耳%以上〕一邊從膜捲中抽出一邊連續地運送,以浸漬時間150秒使其浸漬在收容有25℃純水之膨潤槽中收容之處理液中(膨潤步驟)。然後,將從膨潤槽中拉出之膜以浸漬時間170秒浸漬在收容有碘化鉀/硼酸/水為1.3/0.6/100(質量比)的含碘之30℃處理液之染色槽中(染色步驟)。接著,將從染色槽中拉出之膜以浸漬時間80秒浸漬在收容有碘化鉀/硼酸/水為13.9/4.0/100(質量比)的56℃處理液的交聯槽中(交聯步驟)。繼續將從交聯槽中拉出之膜以浸漬時間10秒浸 漬在收容有碘化鉀/硼酸/水為15.4/5.0/100(質量比)的40℃處理液的補色槽中(補色步驟)。 A long strip of polyvinyl alcohol (PVA) embryo film with a thickness of 60 μm (trade name "Kuraray Poval Film VF-PS # 6000, an average degree of polymerization of 2400, and a degree of saponification of more than 99.9 mol%) manufactured by Kuraray] The film roll is continuously transported while being drawn out, and immersed in a treatment solution contained in a swelling tank containing pure water at 25°C for an immersion time of 150 seconds (swelling step). Then, the film drawn from the swelling tank is The immersion time is 170 seconds, and it is immersed in a dyeing tank (dyeing step) containing potassium iodide/boric acid/water of 1.3/0.6/100 (mass ratio) containing iodine-containing treatment solution at 30°C. Next, it will be pulled out of the dyeing tank The membrane was immersed in a cross-linking tank containing a treatment solution of potassium iodide/boric acid/water at a ratio of 13.9/4.0/100 (mass ratio) at 56°C (cross-linking step) for an immersion time of 80 seconds. Continue to pull out from the cross-linking tank The film was immersed in a color correction tank containing a 40°C treatment solution with a potassium iodide/boric acid/water ratio of 15.4/5.0/100 (mass ratio) for an immersion time of 10 seconds (color correction step).
接著,將從交聯槽中拉出之膜以浸漬10秒的時間浸漬在收容有8℃純水之清洗槽中(清洗步驟),隨後導入於80℃的加熱爐中,藉此以300秒的乾燥時間進行乾燥處理(乾燥步驟)而獲得厚度22μm的偏光片。在膨潤步驟、染色步驟、交聯步驟、補色步驟及清洗步驟中,藉由在槽中的輥間延伸,依表1顯示之倍率進行縱向單軸延伸。以原料膜為基準的總延伸倍率係6.0倍。 Next, the film drawn from the cross-linking tank was immersed in a washing tank containing pure water at 8°C for 10 seconds (washing step), and then introduced into a heating furnace at 80°C to perform a 300 second Drying process (drying step) was performed for the drying time of, to obtain a polarizer with a thickness of 22 μm . In the swelling step, the dyeing step, the cross-linking step, the color correction step, and the cleaning step, the longitudinal uniaxial extension is performed according to the magnification shown in Table 1 by extending between the rollers in the tank. The total stretching ratio based on the raw film is 6.0 times.
<比較例8> <Comparative Example 8>
除了將補色步驟中在補色槽中收容之處理液中的碘化鉀/硼酸/硝酸鋅六水合物/水之質量比變更為9.0/3.0/5.0/100以外,其餘以和比較例7同樣的操作製成厚度22μm之偏光片。 Except that the mass ratio of potassium iodide/boric acid/zinc nitrate hexahydrate/water in the treatment solution contained in the color compensation tank in the color compensation step was changed to 9.0/3.0/5.0/100, the rest was prepared by the same operation as in Comparative Example 7. A polarizer with a thickness of 22 μm .
<實施例4> <Example 4>
準備於水100質量份中含有聚乙烯醇3質量份的水性接著劑。 An aqueous adhesive containing 3 parts by mass of polyvinyl alcohol in 100 parts by mass of water is prepared.
在厚度40μm的三乙酸纖維素(TAC)膜的一面施加皂化處理之後,利用棒式塗機將前述水性接著劑塗布在皂化處理面,同時在厚度40μm的低相位差TAC膜之一面施加皂化處理之後,利用棒塗機將前述水性接著劑塗布在該皂化處理面上。以使接著劑層朝實施例1之偏光片側的方式在偏光片的一面積層TAC膜,於另一面積層低相位差TAC膜,獲得具有TAC膜/接著劑層/偏光片/接著劑層/低相位差TAC膜之層構成的積層體。藉由用熱風乾燥機對所得的積層體進行80℃、140秒之加熱處理,製成具有TAC膜/接著劑層/偏光片/接著劑層/低相位差TAC 膜之層構成的偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 After the saponification treatment was applied to one side of the cellulose triacetate (TAC) film with a thickness of 40 μm , the aforementioned aqueous adhesive was coated on the saponification treatment surface with a bar coater, and at the same time, the low phase difference TAC film with a thickness of 40 μm was applied . After the saponification treatment is applied to one side, the aforementioned aqueous adhesive is coated on the saponification treatment surface using a bar coater. Layer a TAC film on one area of the polarizer with the adhesive layer facing the polarizer side of Example 1, and layer a low retardation TAC film on the other area to obtain a TAC film/adhesive layer/polarizer/adhesive layer/low A laminate composed of layers of retardation TAC film. The resulting laminate was heated with a hot air dryer at 80°C for 140 seconds to prepare a polarizing plate having a layer of TAC film/adhesive layer/polarizer/adhesive layer/low retardation TAC film. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<實施例5> <Example 5>
除了採用實施例2中製作的偏光片作為偏光片以外,其餘以和實施例4同樣的操作製成偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer made in Example 2 was used as the polarizer, the remaining operations were the same as in Example 4 to make a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<實施例6> <Example 6>
除了採用實施例3中製作的偏光片作為偏光片以外,其餘以和實施例4同樣的操作製成偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer made in Example 3 was used as the polarizer, the other operations were the same as in Example 4 to make a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例9> <Comparative Example 9>
除了採用比較例1中製作的偏光片作為偏光片以外,其餘以和實施例4同樣的操作製成偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer produced in Comparative Example 1 was used as the polarizer, the same operation as in Example 4 was used to produce a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例10> <Comparative Example 10>
除了採用比較例2中製作的偏光片作為偏光片以外,其餘以和實施例4同樣的操作製成偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer prepared in Comparative Example 2 was used as the polarizer, the same operation as in Example 4 was used to prepare a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例11> <Comparative Example 11>
除了採用比較例3中製作的偏光片作為偏光片以外,其餘以和實施例4同樣的操作製成偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer produced in Comparative Example 3 was used as the polarizer, the same operation as in Example 4 was used to produce a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例12> <Comparative Example 12>
除了採用比較例4中製作的偏光片作為偏光片,並將低相位差TAC膜變更成厚度40μm的TAC膜以外,其餘以和實施例4同樣的操作獲得具有TAC膜/接著劑層/偏光片/接著劑層/TAC膜的層構成之積層體。藉由用熱風乾燥機對所得的積層體進行80℃、300秒的加熱處理,製成具有TAC膜/接著劑層/偏光片/接著劑層/低相位差TAC膜之層構成的偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer produced in Comparative Example 4 was used as the polarizer and the low retardation TAC film was changed to a TAC film with a thickness of 40 μm , the remaining operations were the same as in Example 4 to obtain a TAC film/adhesive layer/ A laminate composed of polarizer/adhesive layer/TAC film. The resulting laminate was heated at 80°C for 300 seconds with a hot air dryer to prepare a polarizing plate having a layer of TAC film/adhesive layer/polarizer/adhesive layer/low retardation TAC film. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例13> <Comparative Example 13>
除了採用比較例5中製作的偏光片作為偏光片以外,其餘以和比較例12同樣的操作獲得偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer produced in Comparative Example 5 was used as the polarizer, the same operation as in Comparative Example 12 was performed to obtain a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例14> <Comparative Example 14>
除了採用比較例6中製作的偏光片作為偏光片以外,其餘以和比較例12同樣的操作獲得偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer produced in Comparative Example 6 was used as the polarizer, the same operation as in Comparative Example 12 was performed to obtain a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例15> <Comparative Example 15>
除了採用比較例7中製作的偏光片作為偏光片以外,其餘以和比較例12同樣的操作獲得偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer produced in Comparative Example 7 was used as the polarizer, the same operation as in Comparative Example 12 was used to obtain a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
<比較例16> <Comparative Example 16>
除了採用比較例8中製作的偏光片作為偏光片以外,其餘以和比較例12同樣的操作獲得偏光板。對所得的偏光板進行耐久性試驗。將結果顯示於表1中。 Except that the polarizer produced in Comparative Example 8 was used as the polarizer, the same operation as in Comparative Example 12 was used to obtain a polarizer. The durability test was performed on the obtained polarizing plate. The results are shown in Table 1.
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KR20210089632A (en) * | 2018-11-12 | 2021-07-16 | 닛토덴코 가부시키가이샤 | Polarizing film, polarizing film, laminated polarizing film, image display panel, and image display device |
CN112840241B (en) * | 2018-11-12 | 2023-05-12 | 日东电工株式会社 | Polarizing film, laminated polarizing film, image display panel, and image display device |
CN115657192A (en) * | 2018-11-12 | 2023-01-31 | 日东电工株式会社 | Polarizing film, laminated polarizing film, image display panel, and image display device |
JP2021173936A (en) * | 2020-04-28 | 2021-11-01 | 住友化学株式会社 | Polarizing plate and manufacturing method therefor |
JP2021179604A (en) * | 2020-05-08 | 2021-11-18 | 日東電工株式会社 | Image display device |
WO2022102645A1 (en) * | 2020-11-16 | 2022-05-19 | 日東電工株式会社 | Image display panel |
JP2022150490A (en) * | 2021-03-26 | 2022-10-07 | 住友化学株式会社 | Polarizing film and manufacturing method of polarizing plate |
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JP2000035512A (en) * | 1998-07-17 | 2000-02-02 | Sumitomo Chem Co Ltd | Polarizing film |
JP2003029042A (en) * | 2001-07-19 | 2003-01-29 | Nitto Denko Corp | Polarizer, polarizing plate and liquid crystal display device |
JP4043263B2 (en) * | 2002-03-18 | 2008-02-06 | 日東電工株式会社 | Manufacturing method of polarizer, polarizer, polarizing plate, and image display device |
JP2004061565A (en) | 2002-07-24 | 2004-02-26 | Nitto Denko Corp | Polarizer, polarizing plate, optical member and display device using the same |
CN100445780C (en) * | 2004-06-29 | 2008-12-24 | 日东电工株式会社 | Polarizer and method of producing the same, polarizing plate, optical film, and image display |
JP2009042457A (en) * | 2007-08-08 | 2009-02-26 | Nitto Denko Corp | Polarizing plate, method for producing the same, optical film, and image display apparatus |
JP5524501B2 (en) * | 2008-06-30 | 2014-06-18 | 日東電工株式会社 | Polarizer, production method thereof, polarizing plate, optical film, and image display device |
WO2010087653A2 (en) * | 2009-01-30 | 2010-08-05 | 주식회사 엘지화학 | Outstandingly durable and heat-resistant polarising element, polarising plate and image-display device, and polarising-element production method |
JP6071459B2 (en) | 2012-11-19 | 2017-02-01 | 日東電工株式会社 | Polarizing plate, image display device, and manufacturing method thereof |
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