Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheets made therefrom, and sealants, reinforcing sheets and pressure-sensitive adhesive sheets for printing produced therefrom

A pressure-sensitive adhesive composition, comprising a polymer having a polycarbonate structure having a repeating unit represented by the following formula:

• wherein R represents a straight chain or branched hydrocarbon group having from 2 to 20 carbon atoms;
• wherein said polymer is a polyester having a weight average molecular weight of at least 10,000 synthesized from diol components indispensably containing polycarbonate diol and dicarboxylic acid components indispensably containing a dicarboxylic acid having an aliphatic hydrocarbon group of from 2 to 20 carbon atoms or an alicyclic hydrocarbon group in its molecular structure;
• and the storage elastic modulus (G′) at room temperature is at least 2×106 dyne/cm2 and at −30° C. is 3×107 dyne/cm2 or lower and the adhesive strength at room temperature is at least 1 kg/20 mm width.