Polyvinyl alcohol film and method for producing the same

A technology of polyvinyl alcohol film and polyvinyl alcohol-based resin, which is applied in the field of polyvinyl alcohol film with excellent transferability and no light defects, can solve the problems of high labor cost, and achieve the effect of high sliding property and excellent film transferability

Active Publication Date: 2007-10-17
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the production of polyvinyl alcohol film and polarizing film, continuous production is usually performed on a roll-to-roll basis, so it takes a lot of labor to restore the entire line once production stops

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] (production of polyvinyl alcohol film)

[0129] Water (200 kg) at 18° C. was put into a 500 L tank and 40 kg of a polyvinyl alcohol-based resin having a weight average molecular weight of 142,000 and a degree of saponification of 99.8 mol% was added thereto, followed by stirring for 15 minutes. Then, after water was removed all at once, 200 kg of water was added and the whole was stirred for 15 minutes. The resulting slurry was dewatered, thereby obtaining a polyvinyl alcohol-based resin wet cake having a water content of 40 wt%.

[0130] Gained polyvinyl alcohol-based resin wet cake (67kg) is put into dissolving tank and adds glycerol, 28kg polyoxyethylene alkylamine (R in formula (5) wherein as plasticizer 4.2kg) 1 for C 12 h 25 And x and y are respectively 1) and 10kg water, then introduce water vapor from the bottom of the container. Stirring (rotational speed: 5 rpm) was started when the internal resin temperature reached 50°C and the internal system was pressu...

Embodiment 2-5

[0142] A polyvinyl alcohol film was obtained in the same manner as in Example 1 except that the conditions shown in Table 1 were used. Table 2 shows the kinetic friction coefficient and surface roughness of the obtained films.

[0143] In addition, a polarizing film was obtained by the same method as in Example 1, and was evaluated by the same method as in Example 1. The results are shown in Table 2.

Embodiment 6

[0145] A polyvinyl alcohol film was obtained in the same manner as in Example 1 except that a polyvinyl alcohol-based resin having a weight average molecular weight of 175,000 was used. The dynamic friction coefficient and surface roughness of the obtained film are shown in Table 2.

[0146] In addition, a polarizing film was obtained by the same method as in Example 1, and was evaluated by the same method as in Example 1. The results are shown in Table 2.

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Abstract

Disclosed is a polyvinyl alcohol film having a film thickness of 30-70 m and a kinetic friction coefficient against stainless-steel roll of not more than 0.03. Also disclosed is a method for producing such a polyvinyl alcohol film.

Description

technical field [0001] The present invention relates to polyvinyl alcohol films. More specifically, the present invention relates to a polyvinyl alcohol film excellent in transportability and free from light defects and a method for producing the same. Background technique [0002] Currently, a polyvinyl alcohol film is produced by dissolving a polyvinyl alcohol-based resin in a solvent such as water to prepare a raw material solution, forming a film by a solution-flow coating method (hereinafter referred to as a flow coating method) and drying with a metal heating roll or the like. The polyvinyl alcohol film thus obtained has been widely used due to its excellent dyeability and adsorption force, for example, a polarizing film is one of its applications. Polarizing films have been used as elemental components of liquid crystal displays, and in recent years their use has expanded to devices requiring high definition and high reliability. [0003] In this case, as the size o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08K5/16C08L29/04G02B5/30
CPCC08J5/18C08J2329/04C08K5/20G02B5/3033C08L29/04C08F16/06B29D7/01G02F1/1335B29L2007/002B29K2029/04C08L2203/16
Inventor 早川诚一郎胜间胜彦千神昭彦
Owner MITSUBISHI CHEM CORP
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