Ethylene-modified polyvinyl alcohol-based polymer film

A polyvinyl alcohol-based, polymer film technology, applied in the direction of instruments, polarizing elements, applications, etc., can solve the problems of film breakage, difficult stretching, etc., and achieve high yield, good productivity, and shorten the drying time.

Active Publication Date: 2017-05-03
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the prior art such as the above-mentioned Patent Documents 1 to 6, when the stretching speed is increased, problems such as film breakage are likely to occur during the stretching process, and it is difficult to stretch at a high speed.

Method used

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  • Ethylene-modified polyvinyl alcohol-based polymer film
  • Ethylene-modified polyvinyl alcohol-based polymer film
  • Ethylene-modified polyvinyl alcohol-based polymer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] (1) Manufacture of ethylene-modified PVA polymer film:

[0197] A volatilizer consisting of 100 parts by mass of ethylene-modified PVA-based polymer (content rate of ethylene unit: 2.0 mol%, degree of saponification 99.9 mol%, degree of polymerization 2400), 12 parts by mass of glycerin, 0.1 part by mass of lauric acid diethanolamide and water The film-forming stock solution with a composition ratio of 66% by mass was expelled from the T-die in the form of a film to the first drying roller (surface temperature 93°C, peripheral speed (S 1 ) 16.7m / min), the ethylene-modified PVA-based polymer is obtained by saponification of ethylene-modified polyvinyl acetate obtained by copolymerization of ethylene and vinyl acetate, while drying on the first drying roller The entire non-contact surface of the first drying roll is sprayed with hot air at 90°C at a wind speed of 5m / s, while drying until the moisture content reaches 18% by mass, and then peeled off from the first drying r...

Embodiment 2

[0207] (1) In Example 1, as described in the following Table 1, the film-forming conditions during the manufacture of the ethylene-modified PVA-based polymer film were changed, and the discharge amount when the film was discharged onto the first drying roll was changed. In the same manner as (1) of 1, an ethylene-modified PVA-based polymer film with a thickness of 25 μm was produced.

[0208] The Δn(MD) of the ethylene-modified PVA-based polymer film thus obtained was measured by the above-mentioned method Ave , Δn(TD) Ave , mass swelling degree and ultimate stretching ratio (set the temperature of the boric acid / potassium iodide aqueous solution stretched in the fourth step to 64°C, and the stretching speed to 48cm / min (960% / min)), the results are shown in Table 1 below Show.

[0209] (2) Using a test piece in the longitudinal direction (MD) × width direction (TD) = 10 cm × 5 cm collected from the central portion of the ethylene-modified PVA-based polymer film obtained in t...

Embodiment 3～5

[0211] (1) In Example 1, the film-forming conditions when producing an ethylene-modified PVA-based polymer film were changed as described in the following Table 1, and the same operation as in Example 1 (1) was performed to produce an ethylene-modified PVA-based polymer film with a thickness of 60 μm. polymer film.

[0212] The Δn(MD) of each ethylene-modified PVA-based polymer film thus obtained was measured by the method described above. Ave , Δn(TD) Ave , mass swelling degree and ultimate stretching ratio (set the temperature of the boric acid / potassium iodide aqueous solution stretched in the fourth step to 63°C, and the stretching speed to 48cm / min (960% / min)), the results are shown in Table 1 below Show.

[0213] (2) Use a test piece in the longitudinal direction (MD) × width direction (TD) = 10 cm × 5 cm collected from the central portion in the width direction (TD) of each ethylene-modified PVA-based polymer film obtained in the above (1). , carry out the same opera...

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Abstract

An ethylene-modified PVA-based polymer film comprising an ethylene-modified PVA-based polymer having good stretchability and productivity and having an ethylene unit content of 1 to 4 mol%, the film satisfying the following formulas (I) and (II) ). Δn(MD)Ave‑0.1×10‑3≤Δn(TD)Ave≤Δn(MD)Ave+0.25×10‑3 (I) Δn(TD)Ave≤2.5×10‑3 (II) [in the above formula , Δn(MD)Ave represents the value obtained by averaging the birefringence in the direction of mechanical flow of the ethylene-modified PVA-based polymer film in the thickness direction of the film, Δn(TD)Ave represents the value of the ethylene-modified PVA-based polymer The birefringence in the width direction of the film is averaged in the thickness direction of the film.

Description

technical field [0001] The present invention relates to a polyvinyl alcohol-based polymer film modified with ethylene (hereinafter, “polyvinyl alcohol” may be abbreviated as “PVA”) and a method for producing a polarizing film using the film. More specifically, the present invention relates to a film that is not easily broken even when stretched at high speed and at a high magnification, does not interrupt the stretching operation due to film breakage, and is capable of producing optical products such as polarization properties with high yield and good productivity. Disclosed is an ethylene-modified PVA-based polymer film which is a stretched film having excellent properties, and a method for producing a polarizing film using the same. Background technique [0002] Polarizing plates with light transmission and shielding functions and liquid crystals with light switching functions are important components of liquid crystal display devices (LCDs). The field of application of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18B29C55/04G02B5/30B29K29/00B29L7/00
CPCB29C55/04C08J5/18C08J2329/04G02B5/3083G02B1/04G02B5/30
Inventor 森保二郎中居寿夫真田恭太风藤修日笠慎太郎胜野良治
Owner KURARAY CO LTD
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