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Method for producing polarizer, prolarizer, polarization sheet and video display

A technology of visual display and polarizer, which is applied in the direction of polarizing components, instruments, electric solid devices, etc., and can solve the problems of protective film appearance defects, appearance defects, boric acid deposition, etc.

Inactive Publication Date: 2003-10-01
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, boric acid is deposited when drying the polarizing plate, causing a problem of appearance defects in the case of attaching a protective film
In addition, when processing is carried out at the final stage of stretching treatment, in the presence of zinc ions, the precipitation caused by zinc ions when drying the polarizing plate sometimes causes appearance defects in the attached protective film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] An 80 μm thick polyvinyl alcohol film (average degree of polymerization: 2400, degree of saponification: 99.9%) to be dried was immersed in an iodine aqueous solution having a potassium iodide concentration of 0.3% and an iodine concentration of 0.05% at 30° C. for 60 seconds. Then, the obtained film was stretched 5.5 times while being immersed in an aqueous iodic acid solution having a boric acid concentration of 4% at 50° C. for 60 seconds. Thereafter, it was immersed in an aqueous solution of zinc sulfate heptahydrate (zinc sulfate heptahydrate) at a concentration of 4% at 30° C. for 5 seconds. In the next step, the obtained film was immersed in an aqueous potassium iodide solution having a concentration of 4% at 30° C. for 5 seconds. The film was dried at 50°C for 4 minutes to obtain a polarizer. Using a poly vinylalcohol based adhesive, a saponified triacetyl cellulose film having a thickness of 80 μm was adhered to both sides of the obtained polarizer, followed b...

example 2

[0078] An 80 μm thick polyvinyl alcohol film (average degree of polymerization: 2400, degree of saponification: 99.9%) to be dried was immersed in an iodine aqueous solution having a potassium iodide concentration of 0.3% and an iodine concentration of 0.05% at 30° C. for 60 seconds. Then, the film was stretched 5.5 times in an iodine aqueous solution, and then immersed in an aqueous iodic acid solution having a boric acid concentration of 4% at 50° C. for 60 seconds. Thereafter, the obtained film was immersed in an aqueous solution of 4% zinc sulfate heptahydrate at 30°C for 5 seconds, and then immersed in an aqueous solution of potassium iodide at 4% at 30°C for 5 seconds. Then, the film was dried at 50° C. for 4 minutes to obtain a polarizer. Using a polyvinyl alcohol-based adhesive, a saponified triacetyl cellulose film having a thickness of 80 μm was adhered to both sides of the obtained polarizer, followed by drying at 60° C. for 4 minutes to obtain a polarizing plate. ...

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PUM

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Abstract

The present invention provides a method of producing a polarizer with good durability, dyeing the polarizer with iodine, and boric acid treatment, and making the polarizer without defects caused by boric acid or zinc deposits Contains Zinc. The production method comprises the steps of: dyeing the unstretched polyvinyl alcohol film with iodine; performing uniaxial stretching treatment and boric acid treatment; then performing zinc immersion treatment; and then performing iodide ion immersion treatment.

Description

technical field [0001] The invention relates to a method of producing polarizers, and polarizers obtained by the method. The present invention also relates to a polarizing plate using the polarizer. Also, there are visual displays using the polarizing plate, such as liquid crystal displays, organic EL (Electro Luminescence) displays, and PDP (Plasma Display Panels). Background technique [0002] Heretofore, polarizers used in liquid crystal displays and the like have used polyvinyl alcohol films dyed with iodine because of high transmittance and high degree of polarization. A polarizer is generally used as a polarizing plate, and a protective film, such as a protective film made of triacetyl cellulose, is laminated on one or both sides thereof. [0003] In recent years, the use of liquid crystal displays has become more and more widespread. With the widespread use of liquid crystal displays, liquid crystal displays are often used in high-temperature environments for a long...

Claims

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Application Information

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IPC IPC(8): C08J7/00G02B5/30G02F1/1335H01L51/50H05B33/02
CPCG02B5/3033G02B5/30
Inventor 楠本诚一三原尚史杉野洋一郎济木雄二近藤千里正田位守
Owner NITTO DENKO CORP
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