Polarizing plate

Patent metadata

Field	Value
Publication number	US-10241236-B2
Application number	US-201615290775-A
Country	US
Kind code	B2
Filing date	Oct 11, 2016
Priority date	Nov 4, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A primary object of the present invention is to provide a polarizing plate excellent in durability. A polarizing plate (100) according to an embodiment of the present invention includes: a polarizer (10); and a protective film (21 and 22) arranged on at least one side of the polarizer (10). The polarizing plate (100) has a dimensional change ratio of −0.2% or more in a transmission axis direction thereof when the polarizing plate (100) cut into a size measuring 100 mm by 100 mm is bonded to a glass plate with a pressure-sensitive adhesive and the following operation is repeated 100 times: the polarizing plate (100) bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere at 85° C. for 30 minutes.

First claim

What is claimed is:

1. A polarizing plate, comprising:
a polarizer; and
a protective film arranged on at least one side of the polarizer,
wherein the polarizing plate has been subjected to heat treatment under conditions of a temperature in a range from 85° C. to 120° C. and a time period of 1 hour or more and 100 hours or less,
wherein the polarizing plate has a dimensional change ratio of −0.2% or more in a transmission axis direction thereof;
wherein the dimensional change ratio is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere for 85° C. for 30 minutes, is repeated 100 times.

2. The polarizing plate according to claim 1 , wherein the polarizing plate has the dimensional change ratio of 0.1% or less.

3. The polarizing plate according to claim 1 , wherein the polarizing plate has the dimensional change ratio of −0.1 to 0.1%.

4. The polarizing plate according to claim 1 , wherein the polarizing plate has a dimensional change ratio of −0.6 to 0% in an absorption axis direction,
wherein the dimensional change ratio in an absorption axis direction is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere at 85° C. for 30 minutes, is repeated 100 times.

5. The polarizing plate according to claim 1 , further comprising a second protective film,
wherein the second protective film is arranged on another side of the polarizer that is opposite to the protective film.

6. A polarizing plate, comprising:
a polarizer; and
a protective film arranged on at least one side of the polarizer,
wherein the polarizing plate has been subjected to a heat treatment under conditions of a temperature in a range of from 85° C. to 120° C. and a time period of 1 hour or more and 100 hours or less,
wherein the polarizing plate has a dimensional change ratio of −0.2% or more in a transmission axis direction thereof;
wherein the dimensional change ratio is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere at 85° C. for 30 minutes, is repeated 100 times, and
the polarizing plate has one selected from the group consisting of a through-hole formed therein, a site having an outer edge forming a substantially V-shape that is convex inward in a surface direction, and the combination of the through-hole and the site.

7. The polarizing plate according to claim 6 , wherein the polarizing plate has the dimensional change ratio of −0.1 to 0.1%.

8. The polarizing plate according to claim 6 , wherein the polarizing plate has a dimensional change ratio of −0.6 to 0% in an absorption axis direction,
wherein the dimensional change ratio in an absorption axis direction is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere at 85° C. for 30 minutes, is repeated 100 times.

9. The polarizing plate according to claim 6 , further comprising a second protective film,
wherein the second protective film is arranged on another side of the polarizer that is opposite to the protective film.

10. A polarizing plate, comprising:
a polarizer; and
a protective film arranged on at least one side of the polarizer,
wherein the polarizing plate has a thickness of 20 μm or less,
wherein the polarizing plate has been subjected to heat treatment under conditions of a temperature in a range from 85° C. to 120° C. and a time period of 1 hour or more and 100 hours or less,
wherein the polarizing plate has a dimensional change ratio of −0.2% or more in a transmission axis direction thereof;
wherein the dimensional change ratio is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere for 85° C. for 30 minutes, is repeated 100 times, and
the polarizing plate has one selected from the group consisting of a through-hole formed therein, a site having an outer edge forming a substantially V-shape that is convex inward in a surface direction, and a combination of the through-hole and the site.

11. The polarizing plate according to claim 10 , wherein the polarizing plate has the dimensional change ratio of −0.1 to 0.1%.

12. The polarizing plate according to claim 10 , wherein the polarizing plate has a dimensional change ratio of −0.6 to 0% in an absorption axis direction,
wherein the dimensional change ratio in an absorption axis direction is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere at 85° C. for 30 minutes, is repeated 100 times.

13. The polarizing plate according to claim 10 , further comprising a second protective film,
wherein the second protective film is arranged on another side of the polarizer that is opposite to the protective film.

Assignees

• Nitto Denko Corp

Inventors

• Takada Katsunori
• Higuchi Naotaka
• Nakai Kota
• Nagano Shinobu
• Suefusa Eiko
• Kitamura Yoshitsugu
• Kimura Keisuke

Classifications

• Y10T428/24777

  Edge feature · CPC title

• Y10T428/24322

  Composite web or sheet · CPC title

• Y10T428/24273

  including aperture · CPC title

• G02B5/30 Primary

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• G02B1/14 Primary

  Protective coatings, e.g. hard coatings · CPC title