| 摘要 |
<p>Provided is a radiation-cure removable type pressure-sensitive adhesive sheet that is produced using plant-derived raw materials and has stable adhesive properties and also has good removability after exposure to radiation. The radiation-cure removable type pressure-sensitive adhesive sheet includes: a pressure-sensitive adhesive layer made from a polyester-based pressure-sensitive adhesive composition containing a polyester including at least a lactic acid unit, a dibasic acid unit, and a glycol unit, a radiation-cure resin, a radiation reaction initiator, and a crosslinking agent, wherein the dibasic acid unit includes a dimer acid, the polyester has a glass transition temperature of -70 to -20°C, a weight average molecular weight of 20,000 to 200,000, and a hydroxyl value of 1 to 60 mgKOH/g, the composition contains 30 to 70 parts by weight of the radiation-cure resin based on 100 parts by weight of the polyester and contains 3 to 10% by weight of the radiation reaction initiator based on the amount of the radiation-cure resin, and the pressure-sensitive adhesive layer has a gel fraction of 20 to 80% by weight before exposure to radiation.</p> |
