Patent ID: 8141244

Claim:
A method of manufacturing a printed circuit board comprising a circuit pattern and a via, the method comprising: perforating at least one through-hole in a first insulator, the through-hole being in correspondence with the via; applying a surface treatment on the first insulator by irradiating an ion beam; forming a first seed layer over an inner wall of the through-hole and over one or either side of the first insulator; forming a first plating resist over one or either side of the first insulator having the first seed layer formed thereon; performing electroplating in correspondence with the circuit pattern and the via; removing the first plating resist; and removing a portion of the first seed layer by flash etching, wherein the insulator is formed by impregnating a base material with a liquid composition and curing the liquid composition, the liquid composition comprising 20 to 50 parts by weight of a PMDA-ODA mixture, the PMDA-ODA mixture including pyromellitic dianhydride (PMDA) and oxydianiline (ODA) mixed in a weight ratio of 40:60 to 60:40; 50 to 80 parts by weight of a triazine derivative; and 300 to 600 parts by weight of an organic solvent.