| 摘要 |
PURPOSE:To obtain a marking compsn. generating a sharply developed color mark by the irradiation with laser beam. CONSTITUTION:A marking compsn. is composed of a thermoplastic resin containing 3-80wt.% of an epoxy resin with a softening point 80 deg.C or higher, 5-80wt.% of a filler such as alumina, silica, calcium carbonate, talc or clay and 1-10wt.% of a colorant discolored by heat. As such colorant, yellow iron oxide, lead sulfate, cobalt violet and bismuth oxalate are designated. |
