| 摘要 |
PROBLEM TO BE SOLVED: To provide a double face adhesive sheet which possesses excellent releasability by comprising a adhesive layer and a release liner, formed of a polyolefin film, in contact with both sides of the adhesive layer, the surface roughness of the polyolefin film being within a specified numerical range in terms of the center line average height. SOLUTION: This double face adhesive sheet x comprises: a 30 to 250μm- thick polyolefin film 1; and a 5 to 150μm-thick adhesive layer 2 formed on the polyolefin film 1 by application of a adhesive. The surface roughness of the polyolefin film 1 on its main side release face 11 and the surface roughness of the polyolefin film 1 on its backside release face 12 are such that the surface roughness is in the range of 0.1 to 1.0μm in terms of the center line average height [Ra], and the release face in contact with the adhesive layer 2 has increased peel force by virtue of biting effect attained by the pressure-sensitive adhesive. The adhesive layer 2 is formed of a polymer having a polycarbonate structure, with a wt. average mol.wt. of not less than 10,000, comprising repeated units, represented by formula (wherein R represents a 2-20C hydrocarbon), synthesized from a diol, such as polyhexamethylene carbonate diol, and a dicarboxylic acid, such as succinic acid.
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