Patent ID: 8840967

Claim:
A method for manufacturing a printed circuit board comprising: forming a flame retardant insulation layer by coating a flame retardant resin composition on the surface of a substrate, the composition comprising: (a) a complex epoxy resin composed of 5 to 20 parts by weight of a bisphenol A epoxy resin with an average epoxy resin equivalent of 100 to 700, 30 to 60 parts by weight of a cresol novolac epoxy resin with an average epoxy resin equivalent of 100 to 600, 5 to 15 parts by weight a rubber-modified epoxy resin with an average epoxy resin equivalent of 100 to 500, and 15 to 30 parts by weight of a phosphorus-containing epoxy resin with an average epoxy resin equivalent of 400 to 800; (b) an amino triazine-containing curing agent; (c) a curing accelerator; and (d) an inorganic filler, precuring the substrate on which the flame retardant insulation layer is formed; treating the substrate on which the flame retardant insulation layer is formed with 2-(2-butoxyethoxy)ethanol and ethane-1,2-diol; etching the result with 55 g/L NaMnO4, 18 g/L Na2MnO4, 45 g/L NaOH water solution; neutralizing with 60% H 2 SO 4 ; and forming circuit patterns on the flame retardant insulation layer on which the roughness is formed.