To provide a pressure-sensitive adhesive sheet capable of preventing breakage of a foam layer of synthetic paper and occurrence of delamination between a pressure-sensitive adhesive layer and the synthetic paper, etc., when the sheet is released for the purpose of being again attached immediately after once attached, capable of preventing occurrence of peeling, floating, etc., after an elapse of a long time since the sheet is attached, and desirable from an environmental viewpoint, because of being given without using an organic solvent, etc.
This pressure-sensitive adhesive sheet has the propylene-based synthetic paper 1 and the pressure-sensitive adhesive layer 2, wherein the pressure-sensitive adhesive layer is formed on one of surfaces of the propylene-based synthetic paper by using an acrylic emulsion-type pressure-sensitive adhesive containing an acrylic emulsion, the pressure-sensitive adhesive sheet has an adhesive strength of 0.5-8 N/25 mm, when the sheet is attached, then kept at 23°C and a relative humidity of 50% for 10 min, and measured as specified in JIS Z0237, and further the sheet has adhesive strengths of ≥6 N/25 mm, in both cases when the sheet is attached, then kept at 23°C and a relative humidity of 50% for 24 hr, and measured, and when the sheet is attached, then allowed to stand at 60°C for 7 days, and measured.
Toshiyasu Yagi
Ueda Kazuyuki