Acrylic adhesive, acrylic adhesive composition, adhesive film, and flexible device

Provided are: an acrylic adhesive which is capable of exhibiting both excellent bendability with respect to bending operation and excellent restorability in a low-temperature environment; an acrylic adhesive composition which forms the acrylic adhesive; an adhesive film which has an adhesive layer comprising the acrylic adhesive; and a flexible device which is provided with the adhesive film. The acrylic adhesive according to an embodiment of the present invention has an adhesive force of 5.0 N/25 mm or more with respect to a polyimide film at 23 DEG C, a peel rate of 300 mm/min, and a peel angle of 180 DEG, and has a creep value of 70% or more at-20 DEG C and a recovery value of 70% or more at-20 DEG C. 提供在低温环境下能够兼顾表现对弯曲动作的优异的弯曲性和优异的恢复性的丙烯酸系粘合剂、形成该丙烯酸系粘合剂的丙烯酸系粘合剂组合物、具有由该丙烯酸系粘合剂构成的粘合剂层的粘合薄膜、及具备该粘合薄膜的柔性器件。本发明的实施方式的丙烯酸系粘合剂是在23℃下、剥离速度300mm/分钟、剥离角度180度下对聚酰亚胺薄膜的粘合力为5.0N/25mm以上的丙烯酸系粘合剂，在-20℃下的蠕变值为70％以上，在-20℃下的恢复值为70％以上。