TRANSPARENT DOUBLE-SIDED SELF-ADHESIVE SHEET
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Abstract
A transparent double-sided self-adhesive sheet is provided which, when bonding to an adherend, not only excels in the ability to conform to steps or surface irregularities caused by a printing site, but also excels in workability such as cutting processability. A transparent double-sided self-adhesive sheet is proposed, having an intermediate resin layer (A) and pressure-sensitive adhesive layers (B) as front and reverse side layers, each of the layers being a layer having one or more species of (meth)acrylic acid ester series (co)polymer as the base resin, in which transparent double-sided self-adhesive sheet, the shear storage elastic modulus (G′(A)) at a frequency of 1 Hz of the intermediate resin layer (A) is higher than the pressure-sensitive adhesive layers (B) in a temperature range of 0° C. to 100° C., and, the indentation hardness (ASKER C2 hardness) of the entire sheet is 10 to 80.
3 Citations
31 Claims
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1-13. -13. (canceled)
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14. An image display device structural member, comprising:
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a transparent double-sided self-adhesive sheet adhered into a single body between two members, wherein at least one of the two members is a protective panel having a step on a surface contacted with the transparent double-sided self-adhesive sheet, wherein the transparent double-sided self-adhesive sheet consists of three layers, wherein the three layers consist of an intermediate layer (A) and two pressure-sensitive adhesive surface layers (B) as front and reverse side layers, wherein each of the three layers is formed from a composition comprising a (meth)acrylic acid ester copolymer as a base resin, and wherein the transparent double-sided self-adhesive sheet has; an indentation hardness, ASKER C2 hardness, of from 10 to 80, and a creep value measured by the following method comprising (a) to (d) is from 1 mm to 15 mm; a) adhering one side of the sheet to a vertically standing SUS plate wherein an adhesion surface area is 15 mm×
20 mm,b) curing the sheet under an atmosphere of 60°
C. for 15 minutes,c) applying a weight of 4.9 N to the sheet in the vertical direction, and then d) measuring the creep value of an adhesion position at the end of 60 minutes. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification