PROTECTIVE FILM, FOLDABLE DEVICE, AND ROLLABLE DEVICE

Provided is a protective film, which: has excellent bending recovery; even when bonded to the rear side of a polyimide base comprising a barrier layer, does not damage the barrier layer; and has excellent transparency and foreign material inspection properties. Further provided are a foldable device and a rollable device comprising a protective film of this kind. The protective film according to one embodiment of the present invention, which is directly bonded to a polyimide base, has a base material layer and an adhesive layer, the base material layer substantially not containing particles, or agglomerates of particles, with a Feret diameter greater than or equal to 1 [mu]m. 提供一种弯曲恢复性优异、即便贴合在具备阻隔层的聚酰亚胺基板的背侧也不破坏该阻隔层、透明性优异、异物检查性优异的保护薄膜。提供具备这种保护薄膜的可折叠设备和可卷曲设备。本发明的实施方式所述的保护薄膜是直接贴合于聚酰亚胺基板的保护薄膜，其具有基材层和粘合剂层，基材层实质上不含费雷特直径为1μm以上的颗粒或颗粒的聚集物。