Patent ID: 8221842

Claim:
A method for preparing a metallic laminate, the method comprising a step of: coating a polyimide precursor solution on a metal layer and drying and curing the polyimide precursor solution so as to form a polyimide resin layer having a modulus of elasticity of 70 Mpa or more at 400° C., wherein the step of forming the polyimide resin layer includes the steps of: coating a first polyimide precursor solution on the metal layer and drying and curing the first polyimide precursor solution so as to form a first polyimide resin layer having a coefficient of thermal expansion of 20 ppm/K or less; and coating a second polyimide precursor solution on the first polyimide resin layer and drying and curing the second polyimide precursor solution so as to form a second polyimide resin layer having a coefficient of thermal expansion of more than 20 ppm/K, and the polyimide resin layer including the first and second polyimide resin layers has a coefficient of thermal expansion of 20 ppm/K or less.