PRESSURE SENSITIVE ADHESIVE SHEET HAVING FUNCTION OF INDICATING PEELED-OFF AND MANUFACTURING PROCESS OF THE PRESSURE SENSITIVE ADHESIVE SHEET

摘要

PROBLEM TO BE SOLVED: To provide a pressure sensitive adhesive sheet having the function of indicating "peeled-off" with which the evidence that the sheet is peeled off is visually recognizable definitely and clearly and a manufacturing process of the sheet. SOLUTION: The pressure sensitive adhesive sheet having the function of indicating "peeled-off" has a structure in which a base material layer 1 has a base material supporting body 4 and a peel layer 5 formed on a part of the base material supporting body 4 and a colored layer 6 is laminated with the entire or a part of the surface of the base material supporting body 4 to cover the peel layer 5. A pressure sensitive adhesive layer 2 is laminated with the base material layer. The surfaces contacting the colored layer 6 of the base material supporting body 4 and the peel layer 5 have a surface modified layer 13 treated with an adhesion improving means. The relationships among (A) the adhesion strength between the base material supporting body 4 and the peel layer 5, (B) the adhesion strength between the surface modified layer 13 of the base material supporting body 4 and the colore layer 6, (C) the adhesion strength between the colored layer 6 and the pressure sensitive adhesive layer 2 and (D) the adhesion strength between the pressure sensitive adhesive layer 2 and a polyethylene board are (A)<(D)<(B) and (A)<(D)<(C). COPYRIGHT: (C)2005,JPO&NCIPI