| 摘要 |
To provide a pressure-sensitive adhesive sheet according to which air entrapment and blistering can be prevented or eliminated via through-holes, and yet the appearance compares favorably with that of a pressure-sensitive adhesive sheet having no through-holes therein, as a substrate 11 there is used one having a surface roughness (Ra) of not less than 0.03 mum, a lightness (L*) in the L*a*b* color system of not more than 60 in the case of having a chroma (C*) of not more than 60 and a lightness (L*) of not more than 85 in the case of having a chroma (C*) greater than 60, and a contrast ratio of not less than 90%, through-holes 2 passing through the substrate 11 and a pressure-sensitive adhesive layer 12 are made to have a diameter in the substrate 11 and the pressure-sensitive adhesive layer 12 of from 0.1 to 200 mum, a diameter at a surface of the substrate 11 of from 0.1 to 42 mum, and a hole density of from 30 to 50,000 per 100 cm<SUP>2</SUP>, in the case that melted portions formed by a laser are present around the through-holes 2 at the surface of the substrate 11 , the melted portions are made to have an outside diameter of not more than 50 mum, and in the case that thermally deformed portions are present around the through-holes 2 at the surface of the substrate 11 , the thermally deformed portions are made to have an outside diameter of not more than 180 mum.
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