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Adhesive sheet method for producing the same and method for producing image display apparatus

A manufacturing method and technology of adhesive sheets, which are applied in the directions of adhesive types, ester copolymer adhesives, polymer adhesive additives, etc., can solve the problems of air bubbles around the printing height difference, and achieve height difference absorption. Excellent properties, excellent adhesive reliability, and small shear storage modulus

Active Publication Date: 2019-08-06
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bubbles are likely to be formed around the printed height difference when the adhesive is pasted on the transparent member with the decorative printing layer

Method used

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  • Adhesive sheet method for producing the same and method for producing image display apparatus
  • Adhesive sheet method for producing the same and method for producing image display apparatus
  • Adhesive sheet method for producing the same and method for producing image display apparatus

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0109]

[0110] A polymer in which a cross-linked structure formed of a urethane-based segment is introduced into an acrylic polymer chain can be polymerized by various known methods. In the case of using urethane (meth)acrylate as the constituent component of the urethane-based segment, the monomer components for constituting the acrylic polymer chain are combined with the urethane (meth)acrylate can be co-polymerized.

[0111] The usage-amount of urethane (meth)acrylate is preferably 3 to 30 parts by weight, more preferably 4 to 25 parts by weight with respect to 100 parts by weight of the monomer component for constituting the acrylic polymer chain share. By adjusting the usage-amount of a urethane (meth)acrylate, the base polymer whose content of a urethane segment is in the said range can be prepared. When the content of the urethane-based segment is too small, there is a tendency that the adhesive retention force of the PSA sheet decreases due to the decrease in the ...

Embodiment 1

[0170] (polymerization of prepolymer)

[0171] 52.8 parts by weight of butyl acrylate (BA), 10.9 parts by weight of cyclohexyl acrylate (CHA), 9.7 parts by weight of N-vinyl-2-pyrrolidone (NVP), 4- 14.8 parts by weight of hydroxybutyl ester (4HBA), 11.8 parts by weight of isostearyl acrylate (ISTA), and photopolymerization initiators ("Irgacure 184" manufactured by BASF: 0.035 parts by weight and "Irgacure 651" manufactured by BASF: 0.035 parts by weight After compounding, ultraviolet ray was irradiated and polymerized so that the viscosity (BH viscometer No. 5 spindle, 10 rpm, measurement temperature 30° C.) became about 20 Pa·s to obtain a prepolymer composition (polymerization rate: about 9%).

[0172] (Preparation of Photocurable Adhesive Composition)

[0173] To the above prepolymer composition, urethane (meth)acrylate terminal acrylic-modified polyether urethane ("UV-3300B" manufactured by Nippon Synthetic Chemical Industry Co., Ltd.): 7 wt. Parts and terminal acrylic ...

Embodiment 2～7、 comparative example 1～10

[0177] Composition of the monomers used in the polymerization of the prepolymer, and the polyfunctional compound (urethane acrylate and / or polyfunctional acrylate), acrylic oligomer, and photopolymerization initiator added to the adhesive composition , and the type and addition amount of the chain transfer agent become as shown in Table 1-1 and Table 1-2. Except for this, a photocurable adhesive composition was prepared in the same manner as in Example 1, and coating on a base material and photocuring were performed to obtain an adhesive sheet. In Example 4, Comparative Example 4, and Comparative Example 5, the same adhesive composition as in Example 3 was used, and the irradiation time of ultraviolet rays was changed, thereby obtaining adhesives with polymerization rates shown in Table 1-1. piece.

[0178] [Evaluation]

[0179]

[0180] The weight average molecular weight (Mw) of an acrylic oligomer and a urethane (meth)acrylate was measured with the Tosoh make GPC (gel p...

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PUM

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Abstract

The invention relates to an adhesive sheet and a manufacturing method thereof, and a manufacturing method of an image display device. The pressure-sensitive adhesive sheet (5) is a photocurable pressure-sensitive adhesive sheet formed in a layered manner from a pressure-sensitive adhesive composition containing a base polymer and a photocurable compound. The adhesive sheet (5) has a haze of 1% orless, an adhesive force to glass of 1.5 N / 10 mm or less, and a shear storage modulus at 25 DEG C of 0.15 MPa or less. The pressure-sensitive adhesive sheet (5) has a glass transition temperature of -3DEG C or less when the polymerization rate is 99% by curing, and a shear storage modulus of 0.16 MPa or more at a temperature of 25 DEG C.

Description

technical field [0001] The present invention relates to a photocurable pressure-sensitive adhesive sheet and a method for producing the same. Moreover, this invention relates to the manufacturing method of the image display apparatus using this adhesive sheet. Background technique [0002] Liquid crystal display devices and organic electroluminescent (organic EL) display devices are widely used as various image display devices such as mobile phones, smartphones, car navigation devices, monitors for personal computers, and televisions. For the purpose of preventing the damage of the image display panel caused by the impact from the outer surface, sometimes a front surface transparent plate such as a transparent resin plate or a glass plate (also called a “cover window” etc.) is provided on the viewing side of the image display panel. ). In addition, in recent years, devices having a touch panel on the viewing side of an image display panel have become widespread. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J4/06C09J4/02C09J7/30C08F220/18C08F226/10C08F220/20
CPCC09J4/06C09J7/30C08F220/18C08F220/1804C08F226/10C08F220/20C08F220/1812C09J9/00C09J7/00C09J133/14C09J11/06C09J11/08
Inventor 宝田翔畑中逸大丹羽理仁下栗大器野中崇弘平野敬祐川竹郁佳池村美佳
Owner NITTO DENKO CORP
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