Polyvinyl alcohol film and method for producing the same

A polyvinyl alcohol film and polyvinyl alcohol-based technology, applied in the field of polyvinyl alcohol film and its manufacture, can solve the problems of reducing film retardation spots and inability to make films, so as to reduce striped dyeing spots and reduce wrinkles , Excellent optical properties

Active Publication Date: 2010-07-21
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the methods described in Patent Documents 8 and 9 are methods of reducing retardation spots of the film by controlling the orientation angle of the protective film, which is one of the constituent materials of the polarizer, and are not methods of controlling the characteristics of the polarizer.
In addition, the production methods described in Patent Documents 8 and 9 cannot produce films of polyvinyl alcohol (hereinafter referred to as "PVA")-based resins used as polarizers.

Method used

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  • Polyvinyl alcohol film and method for producing the same
  • Polyvinyl alcohol film and method for producing the same
  • Polyvinyl alcohol film and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] use figure 2 The barrel film making machine, makes the volatile component rate that is formed by the PVA of 100 mass parts saponification degree 99.9 mol%, average degree of polymerization 2400, 12 mass parts glycerol, 0.1 mass part lauric acid diethanolamide and water be 66 The film-forming stock solution 2 of mass % is discharged from the T die head 1 to the first drying roller 3 (the surface temperature is 94° C., and the peripheral speed is 14 m / min), and then peeled off with the second drying roller 4 a, and dried in the second drying roller. After rolling, drying is carried out at an average of 85°C. At this time, the drying roll having a volatile component rate of 16% by mass was the fifth drying roll, and the drying roll having a volatile component rate of 8% by mass was the tenth drying roll. Peripheral speed ratio S' / S of the drying rolls passing through this section (peripheral speed of the fifth drying roll: S, peripheral speed of the tenth drying roll: S'...

Embodiment 2

[0112] use figure 2 The barrel film making machine, makes the volatile component rate that is formed by the PVA of 100 mass parts saponification degree 99.9 mol%, average degree of polymerization 2400, 12 mass parts glycerol, 0.1 mass part lauric acid diethanolamide and water be 66 The film-forming stock solution 2 of mass % is spouted from the T die head 1 to the first drying roller 3 (the surface temperature is 93° C., and the peripheral speed is 14 m / min), and then peeled off with the second drying roller 4 a, and dried in the second drying roller. After rolling, drying is carried out at an average of 80°C. At this time, the drying roll having a volatile component rate of 16% by mass was the sixth drying roll, and the drying roll having a volatile component rate of 8% by mass was the eleventh drying roll. The peripheral speed ratio S' / S of the drying rolls passing through this section (peripheral speed of the sixth drying roll: S, peripheral speed of the 11th drying roll:...

Embodiment 3

[0114] use figure 2 The barrel film making machine, makes the volatile component rate that is formed by the PVA of 100 mass parts saponification degree 99.9 mol%, average degree of polymerization 2400, 12 mass parts glycerol, 0.1 mass part lauric acid diethanolamide and water be 66 The film-forming stock solution 2 of mass % is spouted from the T die head 1 to the first drying roller 3 (the surface temperature is 93° C., and the peripheral speed is 14 m / min), and then peeled off with the second drying roller 4 a, and dried in the second drying roller. After rolling, drying is carried out at an average of 80°C. At this time, the drying roll having a volatile component rate of 16% by mass was the sixth drying roll, and the drying roll having a volatile component rate of 8% by mass was the eleventh drying roll. Peripheral speed ratio S' / S of the drying rolls passing through this section (circumferential speed of the sixth drying roll: S, peripheral speed of the 11th drying roll...

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PUM

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Abstract

Disclosed is a polyvinyl alcohol film which is useful for producing a polarizing film having only a few wrinkles. The polyvinyl alcohol film is an optical film which uses a polyvinyl alcohol resin as a main raw material. The inclination of the optical axis in the film width direction is 45-135 DEG with respect to the film length direction over the entire width of the film. The polyvinyl alcohol film may have a limiting drawing ratio of more than 6.0 but not more than 8.0, and a swelling elongation ratio of about 100-124%.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2007-218544 for which it applied in Japan on August 24, 2007, The whole is incorporated by reference as a part of this invention. technical field [0002] The present invention relates to a polyvinyl alcohol film suitable for producing a high-performance polarizing film and a production method thereof. Background technique [0003] Polarizers with light transmission and shielding functions are the basic components of liquid crystals and liquid crystal display devices (LCDs) with light switching functions. This LCD is used in a wide range of applications from small devices such as calculators and watches in the early days to recent laptop computers, word processors, LCD color projectors, car navigation systems, and LCD TVs. Bright and vivid screens Therefore, it is required to have a polarizer with better polarizing performance than existing products. [0004] Generally speaking, the polarizer is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C41/26B29C55/06G02B5/30G02F1/1335B29K29/00B29L7/00B29L11/00
CPCB29C41/26B29K2029/04B29C55/06B29K2995/0034C08J5/18C08J2329/04G02B5/3025
Inventor 练苧乔士林哲史藤田聪
Owner KURARAY CO LTD
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