Easy-to-stick adhesive sheet

摘要

The easily applicable adhesive sheet of the invention is characterized by having a base sheet, and an adhesive layer which is provided on the base sheet and which has, in a surface portion, a plurality of air passages having grooves opening on an end edge portion of the base sheet, wherein each air passage includes therein numerous island-like protrusions whose tops are flush with the surface of the adhesive layer, and the island-like protrusions are arranged such that any circle inscribed in the grooves defined by side walls of the air passage and those of the protrusions has a diameter of 5 to 90 μm at the level of the surface of the adhesive layer. The invention provides an easily applicable adhesive sheet which is smoothly applied to an adherend without formation of “blisters,” and which exhibits excellent appearance after application to the adherend.

主权项

1. An adhesive sheet comprising a base sheet and an adhesive layer provided on the base sheet, wherein said adhesive layer comprises in a surface portion thereof a plurality of air passages each having a width of 50 to 3,000 μm and arranged such that a distance between adjacent air passages is 500-600 μm, said air passages having grooves opening on an end edge portion of the base sheet, each air passage comprising therein a plurality of protrusions surrounded by grooves defined by side walls of the air passage and side walls of the protrusions, wherein the protrusions have tops which are flush with the surface of the adhesive layer and are arranged such that the smallest circle inscribed in the grooves defined by the side walls of the air passage and the side walls of the protrusions has a diameter of 10 to 60 μm at the level of the surface of the adhesive, the largest circle inscribed in the grooves defined by the side walls of the air passage and the side walls of the protrusions has a diameter of 14 to 85 μm at the level of the surface of the adhesive, and the length of the side walls of the protrusions is 80-180 μm.