Patent ID: 8470450
Filing Date: 2013-06-25
Classification: H05K,Y10T

Abstract:
1. A method of producing a two-layered copper-clad laminate, comprising the steps of: sputter-depositing and plating a copper layer on a polyimide film to produce a two-layered copper-clad laminate with the copper layer having a surface roughness (Rz) of 0.1 to 0.9 μm; and subjecting the two-layered copper-clad laminate to heat treatment under vacuum at a temperature of 100 to 175° C. for 1 to 5 hours; wherein, after said subjecting step, the two-layered copper-clad laminate has a folding endurance of 150 times or more when measured with a folding endurance test based on JIS C6471.