| abstract |
(57) Abstract: Through a laminated film (A) provided on both sides of a polyester film which does not substantially contain external particles, In a protective film having a surface-hardened layer (B) provided on one surface, the laminated film (A) contains a polyester resin and a melamine-based cross-linking agent as main constituents, and the polyester resin contains a carboxylic acid in a side chain. And / or a protective film having a salt thereof. [Effect] The protective film of the present invention is provided with a surface-hardened layer on one surface and a sticky surface on the other surface through a specific laminated film on both surfaces of a base polyester film containing substantially no external particles. When it is attached to the mating material via the agent layer, it has high surface hardness, excellent abrasion resistance, adhesion, and durability, and at the same time, has excellent transparency. |