| abstract |
The electrolytic copper foil provided by the present invention has a small thickness, high strength, and curling. The electrolytic copper foil provided by the present invention has a tensile strength under normal conditions and a tensile strength measured at room temperature after heating at 200 ° C for 3 hours, and is 350 MPa or more, and is characterized in that the thickness x of the electrolytic copper foil is 10 μm or less. The electrolytic copper foil is cut into 100 mm × 50 mm and placed on a water platform, and the side of 100 mm is used as an end portion, and when the ruler is pressed in parallel with the end portion of the electrolytic copper foil from the end portion to the end of 30 mm When the crimping amount (mm) of the electrolytic copper foil measured as the amount of warpage from the water platform to the other end is y, the formula of y□40/x is satisfied. |