PRESSURE SENSITIVE ADHESIVE SHEET

• Main Authors: CHIBA MIZUHO, ITO KATSUNORI, TACHIKAWA YU
• Format: Patent
• Language: English; Japanese
• Published: 16.06.2022
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; DYES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; PERFORMING OPERATIONS; POLISHES; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

To provide a pressure sensitive adhesive sheet capable of temporarily adhering an adherend in a detachable manner, the pressure sensitive adhesive sheet capable of exhibiting detachability with a low-power laser beam and eliminating a process of cleaning an adherend after detachment, with a narrow range of a detachment appearance location.SOLUTION: A pressure sensitive adhesive sheet includes an adhesive layer and a transfer layer arranged on one side of the adhesive layer. The transfer layer is a layer configured to harden with active energy ray irradiation. An adhesive force I at 23°C is 2 N/20 mm or more when the adhesive layer of the pressure sensitive adhesive sheet is adhered onto glass. A ratio of the adhesive force I at 23°C when the adhesive layer of the pressure sensitive adhesive sheet is adhered onto glass is 5 or more with regard to an adhesive force B at 23°C after ultraviolet ray irradiation of 300 mJ/cm2 onto the transfer layer.SELECTED DRAWING: Figure 1 【課題】被着体を剥離可能に仮固定し得る粘着シートであって、低出力なレーザー光で剥離性が発現され、剥離後に被着体を洗浄する工程を不要とし得、かつ、剥離発現箇所が狭範囲である粘着シートを提供すること。【解決手段】本発明の粘着シートは、粘着剤層と、該粘着剤層の片側に配置された転写層とを備える粘着シートであって、該転写層が、活性エネルギー線の照射により、硬化する層であり、該粘着シートの該粘着剤層をガラスに貼着した際の２３℃における粘着力Ｉが、２Ｎ／２０ｍｍ以上であり、該粘着シートの該粘着剤層をガラスに貼着した際の２３℃における粘着力Ｉの、該転写層に３００ｍＪ／ｃｍ２の紫外線を照射した後の２３℃における粘着力Ｂに対する比が、５以上である。【選択図】図１