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Polyvinyl alcohol film, and method for producing polarizing film using same

A technology of polyvinyl alcohol film and polyvinyl alcohol, which is applied in the direction of polarizing elements, can solve the problems of haze deterioration, and achieve the effects of low haze value, excellent peelability, and good optical performance

Active Publication Date: 2022-01-18
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the PVA films obtained in Patent Documents 1 and 2 form aggregates of the active agent and deteriorate the haze, and improvement is sought.

Method used

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  • Polyvinyl alcohol film, and method for producing polarizing film using same
  • Polyvinyl alcohol film, and method for producing polarizing film using same
  • Polyvinyl alcohol film, and method for producing polarizing film using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] After immersing 100 parts by mass of PVA chips with a degree of polymerization of 2400 and a degree of saponification of 99.9 mol% in 2500 parts by mass of distilled water at 70°C for 24 hours, centrifugal dehydration was performed to obtain a PVA water-containing chip with a volatile fraction of 70 mass%. With respect to 333 parts by mass of the PVA water-containing chip (100 parts by mass of dry PVA), 10 parts by mass of glycerin, 0.27 parts by mass of lauric acid diethanolamide as a nonionic surfactant (B) and 0.27 parts by mass of lauric acid diethanolamide as a surfactant (C ) of polyoxyethylene alkyl ether potassium phosphate 0.08 parts by mass, the obtained mixture was heated and melted with a ventilated twin-screw extruder (the maximum temperature was 130°C) to prepare a film-forming stock solution. Regarding the surfactant (C) used at this time, R in the above formula (I) 1 The number of carbon atoms (alkyl chain length) is 13, and the number (n) of polyoxyethy...

Embodiment 2~6

[0123] Embodiment 2~6, comparative example 1~10

[0124] Production and evaluation of PVA films were performed in the same manner as in Example 1, except that the types and amounts of the nonionic surfactant (B) and surfactant (C) were changed as shown in Table 1. The results are shown in Table 1.

[0125] Here, the surfactant (B) used in Example 3 is R in the above formula (b1) 4 A secondary amide-type aliphatic alkanolamide having 12 carbon atoms (alkyl chain length) and 6 polyoxyethylene chains (n). The surfactant (B) used in Example 4 is R in the above formula (b3) 6 Alkyl ether type nonionic surfactant with 12 carbon atoms (alkyl chain length) and 5 polyoxyethylene chains (n). Surfactant (B) used in embodiment 5 is R in the above-mentioned formula (b4) 7 It is an alkylamine-type nonionic surfactant with 12 carbon atoms (alkyl chain length) and 20 polyoxyethylene chains (m+n). The surfactant (B) used in Example 6 is lauric acid diethanolamide, and the active agent (C)...

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Abstract

A PVA film containing PVA (A), a nonionic surfactant (B), and at least one surfactant (C) selected from formula (I) or (II), is characterized in that the content of the surfactant (B) is 0.04-0.4 mass parts per 100 mass parts of PVA (A) and the content of the surfactant (C) is 0.04-0.4 mass parts per 100 mass parts of PVA (A). The PVA film of the present invention has few activator aggregates and optical defects, a low haze value, and excellent peelability. [In formula (I), R1 is a C8-15 alkyl group, the polyoxyethylene chain number (n) is 3-8, and M is an alkali metal or an amine.] [In formula (II), R2 and R3 each independently are a C8-15 alkyl group, the polyoxyethylene chain number (n+m) is 3-8, and M is an alkali metal or an amine.].

Description

technical field [0001] The present invention relates to a method for producing a polyvinyl alcohol film containing polyvinyl alcohol (A), a nonionic surfactant (B), and a surfactant (C) represented by a specific formula, and a polarizing film using the same. Background technique [0002] Polyvinyl alcohol (hereinafter sometimes abbreviated as PVA) films are used in various applications utilizing unique properties related to transparency, optical properties, mechanical strength, water solubility, and the like. In particular, by taking advantage of its excellent optical properties, PVA films are being used as a raw material (raw material film) for the production of polarizing films, which are basic components of liquid crystal displays (LCDs), that is, polarizing plates, and their applications are expanding. High optical performance is required for polarizing plates for LCDs, and high optical performance is also required for polarizing films which are components thereof. [0...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K5/20C08K5/521C08J5/18C08L71/02G02B5/30
CPCC08J5/18G02B5/30C08J2329/04C08K5/20C08K5/521C08J2471/02C08K5/06C08L29/04B29C55/02
Inventor 鹰取洋平中井慎二
Owner KURARAY CO LTD