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Manufacturing method of one-sided protective polarizing film with transparent resin layer, manufacturing method of polarizing film with adhesive layer, and manufacturing method of image display device

A technology for a transparent resin layer and a manufacturing method, which can be applied in film/sheet adhesives, synthetic resin layered products, adhesives, etc. The effect of easy appearance unevenness, suppression of thickness unevenness, and durability improvement

Active Publication Date: 2020-12-29
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, the durability of a protective polarizing film on one side against thermal shock is insufficient, so polarizing films provided with a protective layer (transparent resin layer) on the polarizer side have been proposed (for example, refer to Patent Documents 1 and 2).

Method used

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  • Manufacturing method of one-sided protective polarizing film with transparent resin layer, manufacturing method of polarizing film with adhesive layer, and manufacturing method of image display device
  • Manufacturing method of one-sided protective polarizing film with transparent resin layer, manufacturing method of polarizing film with adhesive layer, and manufacturing method of image display device
  • Manufacturing method of one-sided protective polarizing film with transparent resin layer, manufacturing method of polarizing film with adhesive layer, and manufacturing method of image display device

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0183] Production example 1 (production of polarizer)

[0184] For substrates of amorphous isophthalic acid-copolyethylene terephthalate (IPA-co-PET) film (thickness: 100 μm) with a water absorption rate of 0.75% and a glass transition temperature (Tg) of 75°C Corona treatment was performed on one side, and the corona treatment surface was coated with polyvinyl alcohol (polymerization degree: 4200, saponification degree: 99.2 mol%) and acetoacetyl modified PVA ( Product name: Gohsefimer Z200, degree of polymerization: 1200, degree of acetoacetyl modification: 4.6%, degree of saponification: 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) and dried to form PVA with a thickness of 11 μm Resin layer, a laminated body was produced.

[0185] The obtained laminate was stretched 2.0 times in the longitudinal direction (longitudinal direction) in an oven at 120° C. between rollers having different circumferential speeds, and free-end uniaxially stretc...

manufacture example 2

[0192] Production example 2 (production of polarizer)

[0193] A polyvinyl alcohol film having an average degree of polymerization of 2400 and a degree of saponification of 99.9 mol % and a thickness of 30 μm was immersed in warm water at 30° C. for 60 seconds to swell. Next, the film was dyed while being immersed in an aqueous solution having a concentration of 0.3% of iodine / potassium iodide (weight ratio = 0.5 / 8), stretched to 3.5 times. Then, stretching was carried out so that the total stretching ratio became 6 times in a borate aqueous solution at 65°C. After stretching, it dried in 40 degreeC oven for 3 minutes, and obtained the PVA type polarizer. The obtained polarizer had a thickness of 12 μm.

manufacture example 3

[0194] Production example 3 (production of one-side protective polarizing film)

[0195] As a protective film, a polarizing film obtained by corona-treating the adhesion-facilitating surface of a (meth)acrylic resin film having a lactone ring structure having a thickness of 40 μm was used.

[0196] 40 parts by weight of N-hydroxyethylacrylamide (HEAA), 60 parts by weight of acryloylmorpholine (ACMO), and 3 parts by weight of a photoinitiator (trade name: IRGACURE 819, manufactured by BASF Corporation) were mixed to prepare a UV-curable glue. Use it as an adhesive for protective films.

[0197] On the surface of the polarizer of the optical film laminate obtained in Production Example 1, the above-mentioned ultraviolet curable adhesive was applied in such a manner that the thickness of the cured adhesive layer became 1 μm, and the above-mentioned protective film was attached at the same time, Then, the adhesive is cured by irradiating ultraviolet rays as active energy rays. ...

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Abstract

The present invention relates to a method for manufacturing a single-sided protective polarizing film with a transparent resin layer, the polarizing film has a single-sided protective polarizing film having a protective film on only one side of a polarizer, and a single-sided protective polarizing film provided on the above-mentioned single-sided protective polarizing film The transparent resin layer of the polarizer surface of the polarizer, the manufacturing method comprises the following steps in sequence: the step (1) of preparing a single-side protective polarizing film having a protective film only on one side of the polarizer; A step (2) of applying an aqueous coating solution containing a resin component to the surface of the polarizer; and a step (3) of drying the obtained coating film to form a transparent resin layer, wherein the polarizer contains a polyvinyl alcohol-based resin, and The thickness is 10 μm or less, and the variation of the water contact angle on the surface of the polarizer on which the transparent resin layer is formed is within the range of the average water contact angle ±20°. According to the present invention, even when the one-side protective polarizing film with a transparent resin layer using a thin polarizer is exposed to a humidified environment, occurrence of uneven appearance can be suppressed.

Description

technical field [0001] The invention relates to a method for manufacturing a single-sided protective polarizing film with a transparent resin layer. Moreover, this invention relates to the manufacturing method of the polarizing film with an adhesive layer which consists of the said one side protection polarizing film with a transparent resin layer, and an adhesive layer. In addition, the present invention relates to the manufacture of image display devices such as liquid crystal display devices (LCDs) and organic EL display devices using the one-side protective polarizing film with a transparent resin layer obtained by the above-mentioned production method, and the polarizing film with an adhesive layer. method. Background technique [0002] Liquid crystal display devices are rapidly expanding in market demand for clocks, mobile phones, PDAs, notebook personal computers, monitors for personal computers, DVD players, and TVs. A liquid crystal display device visualizes a pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B7/02B32B27/30C09J5/00C09J7/20
CPCB32B27/30C09J5/00G02B5/30C09J7/20G02B5/305B32B27/16B32B27/306B32B2307/42B32B2310/14B32B2457/20B32B7/023
Inventor 上野友德三田聪司岸敦史池岛健太郎茂手木佑辅
Owner NITTO DENKO CORP
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