Patent ID: 8889255
Filing Date: 2014-11-18
Classification: B32B,C08G,C08K,C08L,C09J,Y10T

Abstract:
1. A radiation-cure removable pressure-sensitive adhesive sheet, comprising: a pressure-sensitive adhesive layer made from a polyester-based pressure-sensitive adhesive composition comprising a polyester comprising 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 comprises a dimer acid, the polyester has a weight average molecular weight of 20,000 to 200,000 and a glass transition temperature of −70 to −20° C. as measured using a differential scanning calorimeter at a temperature rise rate of 20° C./minute, the polyester has a hydroxyl value of 1 to 60 mgKOH/g, the adhesive composition contains 30 to 70 parts by weight of the radiation-cure resin based on 100 parts by weight of the polyester, the adhesive composition contains 3 to 10% by weight of the radiation reaction initiator based on the amount of the radiation-cure resin, and wherein the pressure-sensitive adhesive layer has a gel fraction of 20 to 80% by weight before exposure to radiation, and a storage modulus before exposure to radiation of 1×10