Method for manufacturing one-sided thin polarizing plate

Patent metadata

Field	Value
Publication number	US-2016229170-A1
Application number	US-201415024561-A
Country	US
Kind code	A1
Filing date	Aug 29, 2014
Priority date	Sep 30, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

The present invention relates to a method for manufacturing a single-faced thin polarizing plate, including: supplying a process film to one surface of a polarizer having a thickness of 50 μm or less; supplying a protection film to the other surface of the polarizer; forming an adhesive layer by supplying an adhesive composition between the polarizer and the protection film; pressing a laminate of the process film/the polarizer/the protection film by disposing a pair of pressing units on a surface of each of the process film and the protection film; and stripping the process film, in which stripping force between the polarizer and the process film is 1.0 N or less.

First claim

1 . A method for manufacturing a single-faced thin polarizing plate, comprising:
supplying a process film to one surface of a polarizer having a thickness of 50 μm or less; supplying a protection film to the other surface of the polarizer; forming an adhesive layer by supplying an adhesive composition between the polarizer and the protection film; pressing a laminate of the process film/the polarizer/the protection film by disposing a pair of pressing units on each surface of each of the process film and the protection film; and stripping the process film, wherein stripping force between the polarizer and the process film is 1.0 N or less.

2 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , further comprising:
forming a protection layer on a surface from which the process film is stripped after the stripping of the process film.

3 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein the adhesive composition is formed by using a radical-curable composition or a cation-curable composition.

4 . The method for manufacturing a single-faced thin polarizing plate of claim 2 , wherein the protection layer is formed by using a radical-curable composition or a cation-curable composition.

5 . The method for manufacturing a single-faced thin polarizing plate of claim 2 , wherein a modulus of the protection layer is 500 MPa to 6000 MPa.

6 . The method for manufacturing a single-faced thin polarizing plate of claim 2 , wherein a thickness of the protection layer is 0.5 μm to 10 μm.

7 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein the pressing is performed under a pressure of 0.5 MPa to 6 MPa.

8 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein a thickness of the process film is 20 μm to 100 μm.

9 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein a width of the process film is larger than a width of the polarizer.

10 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein surface roughness (Ra) of the process film is 0.5 nm to 60 nm.

11 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein the process film includes one kind or more selected from the group consisting of a polyethylene terephthalate film, a polyethylene film, a polycarbonate film, a triacetylcellulose film, a cycloolefin polymer film, and an acryl film.

12 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein the protection film includes one kind or more selected from the group consisting of a polyethylene terephthalate film, a polyethylene film, a polycarbonate film, a triacetylcellulose film, a cycloolefin polymer film, and an acryl film.

13 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein the polarizer is subjected to wet stretching or dry stretching.

14 . The method for manufacturing a single-faced thin polarizing plate of claim 13 , wherein the wet stretching or the dry stretching is performed at a stretching magnification of 4 times or more.

15 . The method for manufacturing a single-faced thin polarizing plate of claim 1 , wherein a thickness of the single-faced thin polarizing plate is 30 μm to 140 μm.

Assignees

• Lg Chemical Ltd

Inventors

• Cho Hae-Sung
• Kim Sung-Hyun
• Son Hyun-Hee
• Ha Dong-Kyun
• Park Kwang-Seung
• Lee Nam-Jeong
• Park Jun-Wuk
• Hwang Tae-Jun

Classifications

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title

• B32B23/08

  of synthetic resin · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• B32B27/365

  comprising polycarbonates · CPC title

• B32B2310/085

  using X-ray · CPC title