Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Polarizing plate and image display apparatus

A technology for polarizers and polarizers, applied in the field of image display devices, can solve problems such as damage to polarizers and non-uniformity, and achieve the effects of excellent optical properties and excellent appearance

Inactive Publication Date: 2008-06-25
NITTO DENKO CORP +1
View PDF14 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, if impurities are placed between the polarizer and the protective film of the polarizer or between the protective film of the polarizer and the lamination roll, the impurities damage the polarizer due to the nip pressure of the lamination roll during the lamination process, and as a result defects that produce inhomogeneity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polarizing plate and image display apparatus
  • Polarizing plate and image display apparatus
  • Polarizing plate and image display apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] (Production Example 1: Production of Polarizer)

[0115] A polyvinyl alcohol film having a thickness of 80 μm was dyed in a 5% by weight iodine aqueous solution (weight ratio: iodine / potassium iodide=1 / 10). Then, the obtained polyvinyl alcohol film was immersed in an aqueous solution containing 3% by weight of boric acid and 2% by weight of potassium iodide. In addition, the polyvinyl alcohol film was stretched 6 times in an aqueous solution containing 4% by weight of boric acid and 3% by weight of potassium iodide, and then immersed in an aqueous solution of 5% by weight of potassium iodide. After that, the obtained polyvinyl alcohol film was dried in an oven at 40° C. for 3 minutes, whereby a polarizer having a thickness of 30 μm was obtained.

Embodiment 2

[0116] (Production Example 2: Production of an acrylic resin film containing a lactone ring having a lactone cyclization rate of 20%)

[0117] 8,000 g of methyl methacrylate (MMA), 2,000 g of 2-(hydroxymethyl)methyl acrylate (MHMA), 10,000 g of 4-methyl-2-pentanone (methyl isobutyl ketone, MIBK) and 5 g of n-dodecanemercaptan were charged into a 30 L reaction vessel equipped with a stirrer, a temperature sensor, a cooling pipe, and a nitrogen introduction pipe, and the temperature of the thus obtained mixture was raised to 105° C. , while passing nitrogen through the vessel, whereby the mixture was refluxed. At this time, 5.0 g of tert-butyl peroxyisopropyl carbonate (Kayacarbon Bic-75 (trade name), produced by Kayaku Akzo Corporation) was added as an initiator, and 10.0 g of tert-butyl peroxyisopropyl carbonate was added dropwise within 4 hours. Simultaneously with a solution of peroxyisopropyl carbonate and 230 g of MIBK, solution polymerization was carried out at reflux (abo...

Embodiment 3

[0122] (Production Example 3: Production of an acrylic resin film containing a lactone ring having a lactone cyclization rate of 25%)

[0123] Optical film (2) was obtained in the same manner as in Production Example 2 (lactone cyclization rate: 25%) except that 7,500 g of methyl methacrylate (MMA) and 2,500 g of 2-( Hydroxymethyl) acrylate (MHMA) was substituted for 8,000 g methyl methacrylate (MMA) and 2,000 g 2-(hydroxymethyl) acrylate (MHMA).

[0124] The pencil hardness of the optical film (2) was B.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
Login to View More

Abstract

The present invention provides a polarizing plate free from unevenness defects and excellent in optical characteristics and appearance, and a high-quality image display device using the polarizing plate. The polarizing plate of the present invention comprises a polarizer and a protective layer (A) disposed on at least one surface of the polarizer, wherein the protective layer (A) has a thickness of 1 to 50 μm and a surface hardness according to pencil hardness equal to or a (meth)acrylic resin layer larger than B, and an adhesive layer having a thickness of 50 to 150 nm is disposed between the polarizer and the protective layer (A).

Description

[0001] This application claims priority under 35 U.S.C. Section 119 to Japanese Patent Application No. 2006-345821 filed December 22, 2006, which is incorporated herein by reference. technical field [0002] The present invention relates to a polarizing plate and an image display device, such as a liquid crystal display device, an organic EL display device or a PDP, comprising at least one of the above polarizing plates. Background technique [0003] A liquid crystal display device must have polarizing plates arranged on both sides of a glass substrate constituting a liquid crystal plane due to its imaging system. An example of such a polarizer used is generally manufactured by attaching a protective film of a polarizer made of a polyvinyl alcohol-based film to each side of a polarizer by using a polyvinyl alcohol-based adhesive. and dichroic substances such as iodine (for example, see JP 2006-220732 A). [0004] To prepare a polarizing plate, a lamination roll is generally...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/10G09F9/00
CPCG02B5/305G02B5/30
Inventor 杉野洋一郎塘口直树羽仁勉中原健治中田美惠
Owner NITTO DENKO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com