Adhesive sheet, optical component with adhesive layer, and image display device.

Abstract

To provide an adhesive sheet that reduces noise, has sufficient adhesive strength, and is also resistant to drop impacts. [Solution] The adhesive sheet 1 has an adhesive layer 10. The adhesive layer 10 does not peel off in a drop impact resistance test, has a dielectric constant of 4 or less at a frequency of 100 kHz, and has a glass adhesive strength of 10 N / 20 mm or more under the conditions of a peeling angle of 180° on at least one side and a tensile speed of 300 mm / min. The adhesive sheet 1 is used in optical components.

Claims

1. Having an adhesive layer, The aforementioned adhesive layer did not peel off in the following drop impact resistance test. The dielectric constant at a frequency of 100 kHz is 4 or less. The glass adhesive strength is 10 N / 20 mm or more under the conditions of a peel angle of 180° on at least one side and a tensile speed of 300 mm / min. Adhesive sheets used in optical components. <Drop Impact Resistance Test> A first glass plate (100 mm long x 75 mm wide, 500 μm thick), the adhesive layer (75 mm long x 45 mm wide), a printed layer (30 μm thick) formed within a 15 mm radius around the edge of the second glass plate, and the second glass plate (100 mm long x 50 mm wide, 500 μm thick) are stacked in that order, and a bonded body is produced by heat treatment at 50°C, 0.5 MPa, and 30 minutes. The bonded body is placed on a support base so that only the protruding portions at both ends in the width direction of the first glass plate are supported by the support base, and the second glass plate is not in contact with the support base, with the first glass plate on the upper side of the bonded body. A metal ball with a mass of 15 g is dropped from a height of 300 mm toward the first glass plate, and it is checked whether or not the adhesive layer and the first glass plate or the printed layer peel off.

2. The adhesive sheet according to claim 1, which does not peel off in the drop impact resistance test after the joint is manufactured and stored at 80°C for one week.

3. The adhesive sheet according to claim 1 or 2, which does not peel off in the drop impact resistance test after the joint has been manufactured and stored at room temperature for 6 months.

4. The adhesive sheet according to claim 1 or 2, wherein the ratio of the glass adhesive strength to the aforementioned glass adhesive strength is 1.0 to 2.0 when the adhesive sheet is bonded to a glass plate and stored at room temperature for 6 months, under the conditions of a peel angle of 180° and a tensile speed of 300 mm / min of the adhesive layer.

5. An optical member with an adhesive layer, wherein the adhesive sheet described in claim 1 or 2 is attached to at least one side of the optical member.

6. An image display device having an optical member with an adhesive layer as described in claim 5.

7. The image display device according to claim 6, wherein it is a touch panel.

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