| 摘要 |
PURPOSE: To provide resin composition for laser marking useful in an industry and composition which can obtain a fresh colored mark with high sensitivity and high visibility particularly by irradiating a molded form of black or dark color of its ground color with a laser beam. CONSTITUTION: A resin composition for laser marking mixes (A) 100 pts.wt. of thermoplastic resin, (B) 0.001 to 20 pts.wt. of low order titanium oxide and/or carbon black and (C) 0.002 to 20 pts.wt. of colorant which is not decomposed by the laser When the composition is irradiated with the laser, the color of the colorant concealed in the ground color of black or dark color is actualized in the mark, thereby color developing the colors of the mark of arbitrary color such as red, blue, yellow, etc. |
