MARKING COMPOSITION, MOLDED PRODUCT, AND MARKING METHOD

PROBLEM TO BE SOLVED: To provide a marking composition which comprises such a coloring agent as is colorless in itself and which produces even in a slight addition amount a color from vivid blackish brown to black by means of a laser beam. SOLUTION: The marking polyolefin resin composition contains a silicon compound of from more than 0.005 % by weight to less than 0.5 % by weight relative to a polyolefin resin. The coloring agent, even in an extremely slight addition amount of less than 0.5 % by weight to the polyolefin resin, can produce a color from blackish brown to black on a part irradiated by a laser beam , so that the coloring agent can give a mark having a color from blackish brown to black on the surface of a molded product of the polyolefin resin, without influencing the color hue and color tone of the product to be subjected to a marking and also without influencing the physical properties such as a moldability and a polishability. COPYRIGHT: (C)2004,JPO