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Rubber-based adhesive composition, rubber-based adhesive layer, optical film with rubber-based adhesive layer, optical member, image display device, and method for producing rubber-based adhesive layer

An adhesive layer and an adhesive technology applied in the field of image display devices, manufacture of rubber-based adhesive layers, and rubber-based adhesive layers can solve problems such as deterioration and polarizer deterioration, and achieve excellent durability , Suppression of defects, and excellent optical reliability

Active Publication Date: 2021-05-14
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a one-sided protective polarizing film can be thinned and reduced in weight, but since one side of the polarizer is not protected by the protective film, there is a problem that it is easy to deteriorate due to moisture, etc.
In addition, even if it is a double-sided protective polarizing film, when the protective film is thinned, the polarizer may also deteriorate due to moisture or the like.

Method used

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  • Rubber-based adhesive composition, rubber-based adhesive layer, optical film with rubber-based adhesive layer, optical member, image display device, and method for producing rubber-based adhesive layer
  • Rubber-based adhesive composition, rubber-based adhesive layer, optical film with rubber-based adhesive layer, optical member, image display device, and method for producing rubber-based adhesive layer
  • Rubber-based adhesive composition, rubber-based adhesive layer, optical film with rubber-based adhesive layer, optical member, image display device, and method for producing rubber-based adhesive layer

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0120] Production example 1 (manufacture of polarizing film (1))

[0121] In order to produce a thin polarizing film, first, a laminate having a 9 μm thick polyvinyl alcohol (PVA) layer formed on an amorphous polyethylene terephthalate (PET) substrate was passed through a stretching temperature of 130°C. Stretching is assisted in the air to produce a stretched laminate. Next, the colored laminate is produced by dyeing the stretched laminate, and stretched in an aqueous solution of boric acid at a stretching temperature of 65°C to stretch the colored laminate integrally with the amorphous PET substrate so that the total stretch The magnification reached 5.94 times, resulting in an optical film laminate comprising a 4 μm thick PVA layer. By such two-stage stretching, an optical film laminate comprising a PVA layer with a thickness of 5 μm constituting a highly functional polarizing film (polarizer) having the following orientation: PVA of a PVA layer formed on an amorphous PET ...

manufacture example 2

[0123] Production example 2 (manufacture of polarizing film (2))

[0124]A polyvinyl alcohol film having a thickness of 30 μm was stretched 3 times while being dyed in a 0.3% iodine solution at 30° C. for 1 minute between rollers having different speed ratios. Then, it was stretched to a total stretch ratio of 6 times while being immersed in an aqueous solution containing 4% boric acid and 10% potassium iodide at 60° C. for 0.5 minutes. Next, after immersing in an aqueous solution containing 1.5% potassium iodide at 30° C. for 10 seconds to wash, and then drying at 50° C. for 4 minutes, a polarizer with a thickness of 12 μm was obtained. Using a polyvinyl alcohol-based adhesive (thickness of the adhesive layer: 0.1 μm), a saponified triacetyl cellulose film with a thickness of 25 μm that was hard-coated on one side was attached to one surface of the polarizer, and On the one hand, a double-sided protective polarizing film (polarizing film (2 )). The composition of the polar...

manufacture example 3

[0125] Production example 3 (manufacture of polarizing film (3))

[0126] In a separable flask equipped with a thermometer, a stirrer, a reflux condenser, and a nitrogen introduction tube, 99 parts by weight of butyl acrylate (BA) and 1 part by weight of 4-hydroxybutyl acrylate (4HBA) as monomer components were put into the flask. 0.2 parts by weight of azobisisobutyronitrile as an initiator and ethyl acetate as a polymerization solvent were used so that the solid content became 20%, nitrogen gas was flowed, and nitrogen replacement was performed for about 1 hour while stirring. Then, the flask was heated to 60 degreeC, it was made to react for 7 hours, and the acrylic polymer whose weight average molecular weight (Mw) was 1.1 million was obtained. In the acrylic polymer solution (100 parts by weight of solid content), 0.8 parts by weight of trimethylolpropane toluene diisocyanate (trade name: CORONATE L, manufactured by Nippon Polyurethane Industry Co., Ltd.) was added as an ...

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Abstract

The rubber-based adhesive composition of the present invention contains polyisobutylene and a hydrogen abstraction type photopolymerization initiator. According to the rubber-based adhesive composition of the present invention, it is possible to form a highly durable rubber-based adhesive layer that has low moisture permeability and suppresses occurrence of problems such as lifting and peeling even in a high-temperature environment.

Description

technical field [0001] The present invention relates to a rubber-based adhesive composition and a rubber-based adhesive layer formed from the rubber-based adhesive composition. Also, the present invention relates to an optical film with a rubber-based adhesive layer provided with the rubber-based adhesive layer on an optical film, and an optical member including the optical film with a rubber-based adhesive layer. Moreover, this invention relates to the image display apparatus containing the said optical film with an adhesive layer and / or an optical member. Furthermore, the present invention relates to a method for producing a rubber-based adhesive layer. Background technique [0002] In recent years, image display devices such as liquid crystal display devices have been strongly required to reduce the weight and thickness, and various optical members such as polarizing films used in image display devices are also desired to be thinner and lighter. [0003] For example, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J123/22C09J4/02C09J4/06C09J7/30C09J11/06G02B5/30
CPCC09J123/22C09J4/06C09J11/06C09J7/20G02B5/30C09J2301/416C09J2301/312
Inventor 泽崎良平保井淳伊崎章典松本真理宫本幸大
Owner NITTO DENKO CORP
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