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Optical polyvinyl alcohol-based film, method for producing the same, and polarizing film using the optical polyvinyl alcohol-based film

A technology based on polyvinyl alcohol and a manufacturing method, which is applied in the field of polarizing films, can solve the problems of increasing display defects of polarizing films and lowering the quality of displays, and achieve the effects of efficient bubble defects, less display defects, and suppressing the reduction of light transmittance

Active Publication Date: 2022-01-11
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When manufacturing a polarizing film without display defects, the original polyvinyl alcohol-based film must also be defect-free. For example, if there are a lot of bubbles in the polyvinyl alcohol-based film, the display defects of the polarizing film will increase. degrades the quality of the display

Method used

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  • Optical polyvinyl alcohol-based film, method for producing the same, and polarizing film using the optical polyvinyl alcohol-based film
  • Optical polyvinyl alcohol-based film, method for producing the same, and polarizing film using the optical polyvinyl alcohol-based film
  • Optical polyvinyl alcohol-based film, method for producing the same, and polarizing film using the optical polyvinyl alcohol-based film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] (Manufacture of polyvinyl alcohol-based films for optics)

[0162] 1,000 kg of polyvinyl alcohol-based resin with a weight average molecular weight of 142,000 and a degree of saponification of 99.8 mol%, 2,500 kg of water, and 0.2 kg of sodium lauryl sulfate as an anionic surfactant (0.02% by weight relative to the resin) were added to the admixture. After stirring at 90° C. in a pressure dissolving tank, 0.2 kg of polyoxyethylene lauryl ether as a nonionic surfactant (0.02% by weight relative to the resin) and 100 kg of glycerin as a plasticizer were added, and the The temperature was raised in a pressurized state by blowing steam, and it was stirred at 140° C. for 8 hours to dissolve uniformly to obtain a polyvinyl alcohol-based resin aqueous solution (resin concentration: 25% by weight).

[0163] Then, the polyvinyl alcohol-based resin aqueous solution was stored in a storage tank at 140° C. for 18 hours, and then defoamed through a foaming step and a steam exhaust s...

Embodiment 2～5、 comparative example 1～4

[0175] Except having manufactured under the conditions shown in following Table 1 and Table 2, it carried out similarly to Example 1, and obtained the polyvinyl-alcohol-type film for optics, and a polarizing film. The properties of the obtained optical polyvinyl alcohol-based film and polarizing film are shown in Table 3 below.

[0176] [Table 1]

[0177]

[0178] [Table 2]

[0179]

[0180] [table 3]

[0181]

[0182] From the results, it can be known that the number of bubbles of the optical polyvinyl alcohol-based films of Examples 1 to 5 is within the specific range of the present invention, so the obtained polarizing film has few display defects. Since the number of cells of the polyvinyl alcohol-based film is outside the specific range of the present invention, the obtained polarizing film has many display defects.

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Abstract

The present invention is an optical polyvinyl alcohol-based film, which is a polyvinyl alcohol-based film with a width of more than 2m and a length of more than 4km. The number of bubbles with a diameter of 50 μm or more contained in ≥4km) is 0.01 / m 2 the following. Therefore, the polarizing film obtained using this optical polyvinyl alcohol-type film has few display defects and is high quality.

Description

technical field [0001] The present invention relates to an optical polyvinyl alcohol-based film, especially an optical polyvinyl alcohol-based film with few bubble defects and excellent transparency, and relates to an optical polyethylene for producing a high-quality polarizing film or polarizing plate without display defects Alcohol-based film, method for producing the same, and polarizing film using the polyvinyl alcohol-based film for optics. Background technique [0002] Conventionally, polyvinyl alcohol-based films have been produced by dissolving polyvinyl alcohol-based resins and additives such as surfactants in water to prepare an aqueous solution (film-making stock solution), and casting the aqueous solution by a solution casting method (casting method). A film is formed, and the obtained film is dried. The polyvinyl alcohol-based film thus obtained is used in many applications as a film excellent in transparency or dyeability, and one of its effective applications...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B29L7/00B29C41/26B29C41/36C08J5/18B29K29/00
CPCG02B5/30G02B1/04B01D19/02B29C39/02B29C39/003B29K2029/04B29L2007/008B29C41/26B29C41/36C08J5/18C08J2329/04
Inventor 枝泽敏行方山智广早川诚一郎御手洗宏志
Owner MITSUBISHI CHEM CORP
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