Double-sided pressure-sensitive adhesive sheet and pressure-sensitive adhesive type optical member

A pressure-sensitive adhesive sheet, optical element technology, applied in optics, adhesives, adhesive types, etc., can solve problems such as uneven optical properties, improve foaming/peeling resistance, excellent stress relaxation properties, Anti-lifting and peeling effect

Inactive Publication Date: 2010-08-18
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, local stress generated by printing thickness unevenness may be applied to the product, and thus there may sometimes be unevenness (irregularity) in optical properties

Method used

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  • Double-sided pressure-sensitive adhesive sheet and pressure-sensitive adhesive type optical member
  • Double-sided pressure-sensitive adhesive sheet and pressure-sensitive adhesive type optical member
  • Double-sided pressure-sensitive adhesive sheet and pressure-sensitive adhesive type optical member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] By adding 69 parts by weight of 2-ethylhexyl acrylate (2EHA), 30 parts by weight of 2-methoxyethyl acrylate (2MEA), 1 part by weight of 4-hydroxybutyl acrylate (4HBA) and 1 part by weight 0.05 parts by weight of a product name "IRGACURE 184" manufactured by Ciba Chemicals and 0.05 parts by weight of a product name "IRGACURE 651" manufactured by Ciba Chemicals were blended into a mixture obtained by mixing acrylic acid (AA). Thereafter, ultraviolet rays were irradiated until the viscosity (BH viscometer, spindle No. 5, 10 rpm, measurement temperature 30° C.) reached about 20 Pa·s to prepare a prepolymer composition in which a part of the above-mentioned monomer components were polymerized.

[0101] To 100 parts by weight of the prepolymer composition, 0.01 parts by weight of trimethylolpropane triacrylate (TMPTA) was added to prepare a composition for forming an acrylic pressure-sensitive adhesive layer.

[0102] The composition for forming an acrylic pressure-sensitive ...

Embodiment 2 and 3

[0105] Examples 2 and 3, Comparative Example 1

[0106] A composition for forming an acrylic pressure-sensitive adhesive layer was prepared in the same manner as in Example 1, except that in Example 2 the amount of TMPTA added was changed, and in Example 3 and Comparative Example 1 no TMPTA and an epoxy crosslinking agent ("TETRADC", manufactured by Mitsubishi Gas Chemical Co., Ltd.) were added, as shown in Table 1.

[0107] Also, using the composition for forming an acrylic pressure-sensitive adhesive layer, a double-sided pressure-sensitive adhesive sheet (substrate-less double-sided pressure-sensitive adhesive sheet) was obtained in the same manner as in Example 1.

Embodiment 4～7

[0109] A prepolymer composition was prepared in the same manner as in Example 1 except that the ratio of acrylic acid (AA) was changed as shown in Table 1.

[0110] TMPTA or Tetrad C was added to the prepolymer composition obtained above as shown in Table 1 to prepare a composition for forming an acrylic pressure-sensitive adhesive layer.

[0111] Also, using the composition for forming an acrylic pressure-sensitive adhesive layer, a double-sided pressure-sensitive adhesive sheet (substrate-less double-sided pressure-sensitive adhesive sheet) was obtained in the same manner as in Example 1.

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PUM

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Abstract

The present invention provides a double-sided pressure-sensitive adhesive sheet, including at least one pressure-sensitive adhesive layer which has a gel fraction of 10 to 70%, has a storage modulus at 23 DEG C. of 1105 Pa or less, and has a residual stress after 180 seconds of 3.5 N / cm2 or less, the storage modulus at 23 DEG C. being measured in accordance with a dynamic viscoelasticity measurement and the residual stress after 180 seconds being measured in accordance with a tensile stress relaxation test under conditions of a temperature of 23 DEG C. and a strain of 300%.

Description

technical field [0001] The present invention relates to double-sided pressure-sensitive adhesive sheets. In addition, the present invention also relates to a pressure-sensitive adhesive type optical element using the double-sided pressure-sensitive adhesive sheet. Background technique [0002] Recently, in many fields, a display device such as a liquid crystal display (LCD) and an input device such as a touch panel to be used in combination with the above display device have been widely used. In the production of these display devices and input devices, transparent pressure-sensitive adhesive sheets are used in the application of optical member adhesion. For example, transparent double-sided pressure-sensitive adhesive sheets are used for adhering touch panels and the like and liquid crystal displays (for example, see Patent Documents 1 to 3). [0003] Among optical elements, those containing elements having unevenness in thickness such as printing unevenness in thickness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J133/08G02F1/1333
CPCC09J2201/128C09J133/066G02F2202/28C09J2201/606Y10T428/2891Y10T428/28C09J2301/124C09J2301/302
Inventor 宝田翔岸冈宏昭马场纪秀野中崇弘
Owner NITTO DENKO CORP
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