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Polyvinyl alcohol-based polymer film and method for producing the same

A polyvinyl alcohol-based, polymer film technology, applied in the field of optical films, can solve problems such as easy breakage, achieve high productivity, shorten drying time, and high yield

Active Publication Date: 2021-05-28
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is a problem that the thinner the PVA-based polymer film is, the easier it is to break when stretched at a high ratio. From this point of view, it is required to be able to manufacture even PVA-based polymer film that can be stretched at a high ratio without breaking even though it is thin, and thus has polarizing performance equal to or higher than conventional products

Method used

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  • Polyvinyl alcohol-based polymer film and method for producing the same
  • Polyvinyl alcohol-based polymer film and method for producing the same
  • Polyvinyl alcohol-based polymer film and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0173] (1) Manufacture of PVA-based polymer film:

[0174] (i) 100 parts by mass of PVA obtained by saponification of polyvinyl acetate (saponification degree: 99.9 mol%, polymerization degree: 2400), 12 parts by mass of glycerin, 0.1 part by mass of lauric acid diethanolamide, and water and volatile matter The film-forming stock solution with a ratio of 66% by mass was passed from the T mold to the first drying roll of a film-forming device equipped with a plurality of drying rolls whose rotation axes were parallel to each other (the surface temperature was 93°C, and the peripheral speed (S 1 ) is 16.0m / min) to form a film, and on the first drying roller, blow hot air at 90°C at a wind speed of 5m / second to the entire non-contact surface of the first drying roller, while drying to volatile The ratio reaches 21% by mass, then peeled from the first drying roll, further dried with the second drying roll and subsequent drying rolls, and then heat-treated with a drying roll (heat ...

Embodiment 2、3 and comparative example 1~3

[0178] (1) In Example 1, the film formation conditions at the time of producing a PVA-type polymer film were changed as shown in following Table 1, and it carried out similarly to Example 1 (1), and produced the PVA-type polymer film.

[0179] The Δn(MD) of each PVA-based polymer film thus obtained was measured by the method described above. Ave , Δn(TD) Ave , mass swelling degree, ultimate stretch ratio and shrinkage range, as shown in Table 1 below.

[0180]

[0181] As shown in Table 1 above, it can be seen that by setting the Δn(MD) of the PVA-based polymer films of Examples 1 to 3 Ave [The value obtained by averaging the birefringence in the mechanical flow direction of the PVA-based polymer film in the thickness direction of the film] and Δn(TD) Ave[The value obtained by averaging the birefringence in the width direction of the PVA-based polymer film in the thickness direction of the film] satisfies the formulas (I) and (II), although stretching to a higher tensile ...

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Abstract

The present invention is a PVA-based polymer film that satisfies the following formulas (I) and (II): Δn(MD) Ave ≤1.3×10 ‑3 (I) Δn(TD) Ave ≤1.3×10 ‑3 (II) [In the above formula, Δn(MD) Ave Indicates the value obtained by averaging the birefringence in the mechanical flow direction of the PVA-based polymer film in the film thickness direction, Δn(TD) Ave represents the value obtained by averaging the birefringence in the width direction of the PVA-based polymer film in the film thickness direction]. The PVA-based polymer film can be stretched at a high ratio without breaking even when the method of stretching to a high stretching ratio during dyeing is used, or when a high stretching temperature is used. This enables stretched films such as polarizing films to be produced with good workability, high yield, low cost, and good productivity.

Description

technical field [0001] The present invention relates to a polyvinyl alcohol-based polymer film (hereinafter, “polyvinyl alcohol” may be abbreviated as “PVA”), a method for producing the same, and an optical film such as a polarizing film produced from the PVA-based polymer film. Background technique [0002] Polarizing plates with light-transmitting and light-shielding functions are equivalent to liquid crystals with light-switching functions as important components of liquid crystal display devices (LCDs). The field of application of this liquid crystal display device has also expanded from small instruments such as calculators and wrist watches at the initial stage of development to notebook computers, liquid crystal monitors, liquid crystal color projectors, liquid crystal televisions, car navigation systems, mobile phones, indoor and outdoor In a wide range of measuring instruments, etc., especially large screens such as liquid crystal monitors and liquid crystal televis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18B29C41/24G02B5/30B29K29/00B29L7/00B29L11/00
CPCB29C41/24C08J5/18G02B5/30C08L29/04G02B5/3033
Inventor 森保二郎铃木悠希胜野良治森翔大朗
Owner KURARAY CO LTD
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