Patent TW-202313327-A (TW)
Title: Electromagnetic wave shield film characterized in that a protective layer, a metal layer, and an adhesive layer are sequentially laminated
Inventor: TAJIMA HIROSHI
IPC: B32B15/088
Filed: 2022-07-29
Abstract: The present invention provides an electromagnetic wave shield film having sufficiently high bending resistance. The electromagnetic wave shield film according to the present invention is characterized in that a protective layer, a metal layer, and an adhesive layer are sequentially laminated. In addition, the ratio ([repulsive force Y])/[repulsive force X]) of the repulsive force Y of the adhesive layer in an adhesive layer repulsive force measurement test to the repulsive force X of a laminate, which is composed of the protection layer and the metal layer, in a laminate repulsive force measurement test is 0.77 or greater. The laminate repulsive force measurement test: making two slices of laminates composed of the protective layer and the metal layer; next, preparing a polyimide film with a thickness of 50 [mu]m; laminating a slice of the above-mentioned laminate on both sides of the above-mentioned polyimide film; at this time, the above-mentioned metal layer is connected to the above-mentioned polyimide film through an adhesive agent composed of epoxy resin with a thickness of 1 [mu]m; then, heating and pressurizing at 3 MPa, 170 DEG C for 3 minutes, then heating at 150 DEG C under atmospheric pressure for 1 hour, and cutting into long side: 60 mm, short side: 10 mm to make the test body of the laminate; letting one of the main surfaces of the test body of the above-mentioned laminate be the first main surface, and letting the other main surface be the second main surface; next, bending the test body of the above-mentioned laminate into a U shape using the longitudinal mid-point as the center in a way that the long side of the test body of the above-mentioned laminate is bent and the first main surface of the test body of the above-mentioned laminate is used as the inner side; then, setting the bent test body of the above-mentioned laminate in a pressure measuring device equipped with a lower jig and a pressing jig, and setting the distance between the above-mentioned lower jig and the above-mentioned pressing jig to 0.5 mm; defining the repulsive force of the test body of the above-mentioned laminate after being kept in this state for 3 seconds as the repulsive force X of the laminate. The adhesive layer repulsive force test: making two slices of the adhesive layer; laminating a slice of the above-mentioned adhesive layer on both sides of the above-mentioned polyimide film; then, heating and pressurizing at 3 MPa, 170 DEG C for 3 minutes, then heating at 150 DEG C under atmospheric pressure for 1 hour, and cutting into long side: 60 mm, short side: 10 mm to make the test body of the adhesive layer; letting one of the main surfaces of the test body of the above-mentioned adhesive layer be the third main surface, and letting the other main surface be the fourth main surface; next, bending the test body of the above-mentioned adhesive layer into a U shape using the longitudinal mid-point as the center in a way that the long side of the test body of the above-mentioned adhesive layer is bent and the third main surface of the test body of the above-mentioned adhesive layer is used as the inner side; then, setting the bent test body of the above-mentioned adhesive layer in a pressure measuring device equipped with a lower jig and a pressing jig, and setting the distance between the above-mentioned lower jig and the above-mentioned pressing jig to 0.5 mm; defining the repulsive force of the test body of the above-mentioned adhesive layer after being kept in this state for 3 seconds as the repulsive force Y of the adhesive layer.