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Polyvinyl alcohol film and production method for polarization film using same

A technology of polyvinyl alcohol film and polyvinyl alcohol, which is applied in the direction of polarizing elements, applications, flat products, etc., can solve the problems of large number of active agent aggregates, poor polarization performance, and peeling problems, and achieve excellent process passability , Polarization performance is good, the effect of a small amount

Active Publication Date: 2021-08-06
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a polyvinyl alcohol-based film using an alkylsulfonate-based surfactant alone may have a problem in peelability during film production.
In addition, in order to improve peelability, when a nonionic surfactant is further used in an alkylsulfonate-based surfactant, the number of active agent aggregates may be large, the haze value may be high, and the processing may be polarized. The polarization performance of the film is poor, and it is expected to improve

Method used

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  • Polyvinyl alcohol film and production method for polarization film using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] As PVA (A), a small piece of PVA (a saponified product of a homopolymer of vinyl acetate) having a degree of polymerization of 2400 and a degree of saponification of 99.9 mol % was used. After immersing 100 parts by mass of the small pieces of PVA in 2500 parts by mass of distilled water at 35° C., centrifugal dehydration was performed to obtain water-containing PVA small pieces with a volatile content of 60 mass %.

[0094] After mixing 250 parts by mass of the PVA water-containing small pieces (100 parts by mass of dry PVA), 25 parts by mass of distilled water, 12 parts by mass of glycerin, 0.08 parts by mass of anionic surfactant (B), and 0.08 parts by mass of electrolyte (C), The obtained mixture was heated and melted with a twin-screw extruder (the maximum temperature was 130° C.) to prepare a film-forming stock solution. The anionic surfactant (B) used at this time is sodium alkylsulfonate (the number of carbon atoms in the alkyl group is 15). In addition, the el...

Embodiment 2～7、 comparative example 1～4

[0097]Except having changed the kind and usage-amount of anionic surfactant (B) and electrolyte (C) as shown in Table 1, it carried out similarly to Example 1, and produced the PVA film, and evaluated it. In addition, the anionic surfactant (B) used in Examples 2-4, 7 and Comparative Examples 1-3 is the same surfactant as the sulfonic acid type used in Example 1. The anionic surfactant (B) used in Example 5 and Comparative Example 4 is sulfate-type polyoxyethylene alkyl ether sodium sulfate (the number of polyoxyethylene chains is 3, and the number of carbon atoms in the alkyl chain is 12) , the anionic surfactant (B) used in Example 6 is a phosphate-type polyoxyethylene alkyl phosphate potassium sulfate (the number of polyoxyethylene chains is 6, and the number of carbon atoms in the alkyl chain is 13). In addition, in Comparative Example 4, instead of using the electrolyte (C), 0.07 parts by mass of lauric acid diethanolamide which is a tertiary amide type nonionic surfactan...

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Abstract

This polyvinyl alcohol film contains a polyvinyl alcohol (A), an anionic surfactant (B) having 9-30 carbon atoms, and an electrolyte (C) having 0-8 carbon atoms, and is characterized in that the contained amount of the anionic surfactant (B) is 0.04-0.40 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol (A), and the contained amount of the electrolyte (C) is 0.04-0.40 parts by mass with respect to 100 parts by mass of polyvinyl alcohol (A). As a result, provided are: a PVA film having less optical defects and activating agent aggregations, a low haze value, and good release properties, and having excellent polarization performance when processed into a polarization film; and a method for producing a polarization film using the PVA film.

Description

technical field [0001] The present invention relates to a polyvinyl alcohol film having a small number of optical defects and active agent aggregates, a low haze value, and good peelability, and a method for producing a polarizing film using the same. Background technique [0002] Polyvinyl alcohol (hereinafter sometimes abbreviated as PVA) film can be used in various applications by utilizing its unique properties regarding transparency, optical properties, mechanical strength, water solubility, and the like. In particular, using its excellent optical properties, PVA film is used as a basic component of a liquid crystal display (LCD), that is, as a raw material (raw material film) for manufacturing a polarizing film constituting a polarizing plate, and its use is expanding. High optical performance is required for a polarizing plate for LCD, and high optical performance is also required for a polarizing film which is a component thereof. [0003] In polarizing plates, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C55/02C08K3/30C08K3/32C08K5/098C08L29/04B29L7/00B29L11/00
CPCB29C55/02C08K3/30C08K3/32C08K5/098C08L29/04G02B5/30C08J5/18G02B5/3033C08J2329/04
Inventor 鹰取洋平浜岛功中井慎二
Owner KURARAY CO LTD