Polarizing plate and method of producing polarizing plate

• US 9,354,373 B2
• Filed: 12/03/2013
• Issued: 05/31/2016
• Est. Priority Date: 03/19/2013
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Saitou, Takeshi, Goto, Shusaku, Shinagawa, Masashi, Nakano, Yuuki, Miyatake, Minoru
• Primary Examiner(s): Font, Frank
• Application Number:
  US14/095,517
• Publication Number:
  US 20140285887A1
• Time in Patent Office: 910 Days
• Field of Search: 359/487.02
• US Class Current: 1/1
• CPC Class Codes: B29C 55/026 of preformed plates or sheets coated with a solution, a dispersion or a melt of thermoplastic material
• CPC Class Codes: B29K 2029/04 PVOH, i.e. polyvinyl alcohol B29K2031/04 takes precedence
• CPC Class Codes: B32B 2037/1253 curable adhesive
• CPC Class Codes: B32B 2037/1276 water-based adhesive
• CPC Class Codes: B32B 2037/243 Coating
• CPC Class Codes: B32B 2038/0028 Stretching, elongating
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 2309/105 Thickness
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B32B 38/10 Removing layers, or parts of layers, mechanically or chemically
• CPC Class Codes: B32B 38/14 Printing or colouring
• CPC Class Codes: G02B 5/305 including organic materials, e.g. polymeric layers

Abstract

A method of producing a polarizing plate according to an embodiment of the present invention includes: stretching and dyeing a laminate including a resin substrate and a polyvinyl alcohol-based resin layer formed on one side of the resin substrate to produce a polarizing film on the resin substrate; laminating a first protective film on the polarizing film on an opposite side to the resin substrate; and peeling the resin substrate, followed by laminating a second protective film on the polarizing film on a side from which the resin substrate has been peeled. The laminating of at least one of the first protective film and the second protective film is performed through an adhesive having a moisture content of 10% or less.

Claims

1. A method of producing a polarizing plate, comprising:

stretching and dyeing a laminate including a resin substrate and a polyvinyl alcohol-based resin layer formed on one side of the resin substrate to produce a polarizing film on the resin substrate;

laminating a first protective film on the polarizing film on an opposite side to the resin substrate; and

peeling the resin substrate, followed by laminating a second protective film on the polarizing film on a side from which the resin substrate has been peeled,

the laminating of at least one of the first protective film and the second protective film being performed through an adhesive having a moisture content of 10% or less.

2. The production method according to claim 1, wherein the laminating of the first protective film is performed through an aqueous adhesive.

3. The production method according to claim 2, wherein the adhesive having a moisture content of 10% or less comprises an active energy ray-curable adhesive.

4. A polarizing plate, which is obtained by the production method according to claim 2.

5. The production method according to claim 1, wherein the adhesive having a moisture content of 10% or less comprises an active energy ray-curable adhesive.

6. A polarizing plate, which is obtained by the production method according to claim 1.

7. A method of producing a polarizing plate, comprising:

stretching and dyeing a laminate including a resin substrate and a polyvinyl alcohol-based resin layer formed on one side of the resin substrate to produce a polarizing film on the resin substrate; and

peeling the resin substrate, followed by laminating a protective film on the polarizing film on a side from which the resin substrate has been peeled,

the laminating of the protective film being performed through an adhesive having a moisture content of 10% or less.

8. The production method according to claim 7, wherein the adhesive having a moisture content of 10% or less comprises an active energy ray-curable adhesive.

9. A polarizing plate, which is obtained by the production method according to claim 7.