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Polarizer, polarizing plate, and image display apparatus
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A technology for image display devices and polarizers, which is applied to polarizing elements, optics, optical elements, etc., and can solve problems such as cracks in polarizers
Pending Publication Date: 2017-06-27
NITTO DENKO CORP
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[0004] The non-polarizing portion is typically formed by subjecting the polarizing plate to a drilling process, but there are problems such as cracks in the polarizing plate during processing
Method used
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Embodiment 1
[0080] (manufacture of laminated body)
[0081] An amorphous isophthalic acid-copolymerized polyethylene terephthalate (IPA-copolymerized PET) film (thickness: 100 μm) having a long shape with a water absorption of 0.75% and a Tg of 75° C. was used as the resin base material.
[0082] One surface of the resin substrate was subjected to corona treatment. Polyvinyl alcohol (polymerization degree: 4,200, saponification degree: 99.2mol%) and acetoacetyl-modified PVA (polymerization degree: 1,200, acetoacetyl modification degree: 4.6%, saponification degree : 99.0 mol% or more, manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., trade name: "GOHSEFIMER Z-200"), was applied to the corona-treated surface at 25°C and dried to form a PVA-based resin layer. Thus, a laminated body was manufactured.
[0083] (manufacture of polarizing plate)
[0084] The obtained laminate was subjected to free-end uniaxial stretching (assisted stretching in air) at a stretch ratio of 2....
Embodiment 2
[0094] A polarizing plate having a transparent portion was obtained in the same manner as in Example 1 except that immersion in 0.1N hydrochloric acid for 30 seconds (acid treatment) was performed after the alkali treatment.
Embodiment 3
[0096] (manufacture of polarizing plate)
[0097] A PVA film (manufactured by Kuraray Co., Ltd., VF-PE #6000) having a thickness of 75 μm was stretched at a draw ratio of 2.0 times while being immersed in an aqueous solution at 30° C. for 30 seconds (swelling treatment).
[0098] Next, the PVA film was stretched at a stretching ratio of up to 3.0 times while being immersed in a dyeing bath having a liquid temperature of 30° C. (dyeing treatment). In the dyeing treatment, the iodine concentration and immersion time were adjusted so that the obtained polarizing plate had a prescribed transmittance. In this example, the film was dyed by dipping for 60 seconds in an aqueous solution of iodine obtained by compounding 100 parts by weight of water with 0.05 parts by weight of iodine and 0.3 parts by weight of potassium iodide.
[0099]Next, the PVA film was immersed in a crosslinking bath (an aqueous solution of boric acid obtained by mixing 100 parts by weight of water with 3 parts...
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Abstract
There is provided a polarizer that can realize multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus. A polarizer according to an embodiment of the present invention includes a resin film containing iodine, wherein the polarizer has formed therein a transparent portion having a transmittance higher than that of another portion, and the transparent portion has a single hue (a2+b2)1 / 2 of less than 1.0, where the a represents an a value of an Lab colorimetric system and the b represents a b value of the Lab colorimetric system.
Description
[0001] This application claims priority under 35 U.S.C. Section 119 from Japanese Patent Application No. 2015-190081 filed September 28, 2015, which is incorporated herein by reference. technical field [0002] The present invention relates to a polarizer, a polarizer and an image display device. Background technique [0003] Some image display devices such as cellular phones and notebook personal computers (PCs) have mounted internal electronic parts such as cameras and the like. Various studies have been conducted for the purpose of improving camera performance of, for example, any such image display device (for example, Japanese Patent Application Laid-Open No. 2011-81315, Japanese Patent Application Laid-Open No. 2007-241314, US 2004 / 0212555 , Japanese Patent Application Laid-Open No. 2012-137738 and WO 2015 / 046969A). However, in association with the rapid widespread use of smartphones and touch panel-type information processing devices, additional improvements in camer...
Claims
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