Self-healing surface protective film with acrylate functional topcoat

摘要

The present invention relates to a composite film comprising at least one paint layer, a polymer film layer and an adhesive layer, in such a way that the polymer film layer is embedded between the paint layer and the adhesive layer, And the adhesive layer is bonded to the opposite major surface of the polymer film layer. Wherein the paint layer is an acrylate paint layer formed from a paint formulation comprising at least one compound having at least two (meth) acrylate functionalities, the paint layer has a surface hardness (HM) of 2.0 to 3.5 N / The polymer film layer has a surface hardness (HM 0.300i / 20.0 / 5.0) of 2.0 to 4.0 N / mm 2 at room temperature and a balancing speed of 300 nN / 20 s It has an elastic recovery of more than 75% after hardness measurement. The composite film synergistically activates the self-healing properties of the paint and the flexible nature of the film such that the protective film has resistance to wear that the paint or film alone can not attain. In a preferred embodiment, the paint formulation contains a urethane (meth) acrylate having a weight ratio of at least 36%.