available from tohto kasei co ltd 1 weight part of coloring pigment fastogen blue nk and 1 weight part of curing catalyst curezol c11z available from shikoku chemicals corporation were added then the resultant was uniformly dry mixed and melt kneaded at 120 u00b0 c for 5 minutes using a kneader then the resulting mixture was milled after cooling but the milling was difficult thus a powder coating composition was not obtained epoxy resin in 60 weight parts epotote yd 904h epoxy equivalents of 1000 g eq available from tohto kasei co ltd 35 weight parts of phenolic curing agent epotote zx 798p phenolic hydroxy equivalents of 700 g eq available from tohto kasei co ltd 1 weight part of coloring pigment fastogen blue nk and 1 weight part of curing catalyst curezol c11z available from shikoku chemicals corporation were added then the resultant was uniformly dry mixed using a kneader and melt kneaded at 120 u00b0 c for 5 minutes then the resulting mixture was milled and classified after cooling to obtain a powder coating composition epoxy resin in 45 weight parts epicoat 1010 epoxy equivalents of 4500 g eq available from japan epoxy resin co ltd 15 weight parts of epoxy resin epotote yd 909 epoxy equivalents of 2200 g eq available from tohto kasei co ltd 10 weight parts of phenolic curing agent epotote zx 798p phenolic hydroxy equivalents of 700 g eq available from tohto kasei co ltd 1 weight part of coloring pigment fastogen blue nk and 1 weight part of curing catalyst curezol c11z available from shikoku chemicals corporation were added then the resultant was uniformly dry mixed using a kneader and melt kneaded at 120 u00b0 c for 5 minutes then the resulting mixture was milled.