Patent ID: 8419918

Claim:
A method of manufacturing a flexible copper clad laminate having a two-layered structure and having an adhesive strength of at least 0.67 kg/cm or more, said method comprising the steps of: modifying the surface of a polyimide film by first-treating with plasma to supply a hydrophilic group to the surface thereof, dipping into a solution containing an ethyleneimine-based silane coupling agent which is prepared by mixing a compound represented by Formula 1 and a compound represented by Formula 2 with a molar ratio of 1:0.25˜1, for surface treatment to induce a graft reaction, and then modifying the surface of the polyimide film by second-treating with plasma to affect molecular recombination on the film; washing and drying the surface modified polyimide film; copper-sputtering either or both surfaces of the dried polyimide film at 0.5˜30 mA and 50˜500 W for 1˜10 hours to form a copper sputtering layer; and electroplating the copper sputtering layer to form a copper electroplating layer, wherein Formula 1 is and Formula 2 is and wherein, R 1 and R 2 are each selected from the group consisting of hydrogen, a C 1 ˜C 10 alkyl group, and a vinyl group.