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Polarizing plate and method for producing same

a technology of polarizing plates and plates, applied in the field of polarizing plates, can solve problems such as prone to durability problems, and achieve the effect of excellent durability

Inactive Publication Date: 2020-04-02
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The polarizing plate exhibits significantly improved durability by reducing stress concentrations and preventing crack formation, particularly at the edges and through-holes, while maintaining external appearance and bonding integrity.

Problems solved by technology

However, when any such form is adopted, a problem in terms of durability is liable to occur.

Method used

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  • Polarizing plate and method for producing same
  • Polarizing plate and method for producing same
  • Polarizing plate and method for producing same

Examples

Experimental program
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Effect test

example 1

(Production of Polarizing Plate Sheet)

[0064]A film (thickness: 28 μm) obtained by incorporating iodine into an elongated PVA-based resin film and uniaxially stretching the film in its lengthwise direction (MD direction) was used as a polarizer.

[0065]A PVA-based adhesive was applied to one side of the polarizer so that its thickness after drying became 100 nm, and an elongated TAC film having a thickness of 40 μm was bonded to the polarizer so that their lengthwise directions were aligned with each other.

[0066]Subsequently, a PVA-based adhesive was applied to the other side of the polarizer so that its thickness after drying became 100 nm, and an elongated acrylic film having a thickness of 30 μm was bonded to the polarizer so that their lengthwise directions were aligned with each other.

[0067]Thus, a polarizing plate sheet having a construction “TAC film / polarizer / acrylic film” was obtained.

[0068]The resultant polarizing plate sheet was cut with a CO2 laser (wavelength: 9.35 μm, out...

example 2

[0070]A polarizing plate was obtained in the same manner as in Example 1 except that: the size of the cut piece was set to 94 mm by 94 mm; and the through-hole was formed in a site distant from the outer edge of the cut piece by 45 mm.

example 3

[0071]A polarizing plate was obtained in the same manner as in Example 1 except that: the size of the cut piece was set to 114 mm by 114 mm; and the through-hole was formed in a site distant from the outer edge of the cut piece by 55 mm.

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Abstract

A polarizing plate excellent in durability. A polarizing plate 100 according to one embodiment includes a polarizer 10; and a pair of protective films 21, 22 respectively arranged on both main surfaces of the polarizer 10, wherein the polarizing plate 100 has a polarizer void portion 30 formed by positioning of an end surface 10a of the polarizer 10 inward in a plane direction relative to each of end surfaces 21a, 22a of the protective films 21, 22.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. application Ser. No. 15 / 565,462, filed on Oct. 10, 2017, which is a 371 of International Application No. PCT / JP2016 / 057494, filed on Mar. 10, 2019, which is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2015-085106, filed on Apr. 17, 2015 and Japanese Patent Application No. 2015-227539, filed on Nov. 20, 2015, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a polarizing plate and a method of producing the polarizing plate.BACKGROUND ART[0003]A polarizing plate has been used in an image display apparatus (e.g., a liquid crystal display apparatus) of a cellular phone, a notebook personal computer, or the like. In recent years, the use of the polarizing plate in, for example, a meter display portion of an automobile or a smart watch has been desired, and hence the formation of the pol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133528G02B5/3033G02B5/3025G02F1/1335G02B1/14G02B1/10G02B5/30
Inventor TAKADA, KATSUNORINAKAI, KOTAHIGUCHI, NAOTAKAKIMURA, KEISUKEKITAMURA, YOSHITSUGUKURAMOTO, HIROKI
Owner NITTO DENKO CORP