| 摘要 |
PROBLEM TO BE SOLVED: To provide polyacetal resin molded products capable of obtaining good markings by a laser marking technique which imparts markings such as clear letters, pictures, and signs on the surface of a polyacetal resin with the use of a laser beam. SOLUTION: Part of the surface of a polyacetal resin molded product of a composition comprising (A) 100 pts.wt. polyacetal resin, (B) 0.001-1.0 pt.wt. difatty acid alkaline earth metal salt produced by inclusion of two or more fatty acids, (C) 1×10-6-1×10-1 pt.wt. fatty acid, and (F) a substance having an absorption wavelength of 1.06μm (=1064 nm) is irradiated with a laser beam to mark it in a color tone different from the color tone of the molded product before the irradiation. The composition further comprising (D) a fatty acid diester compound, (E) a fatty acid monoester compound, and (G) a pigment is subjected to marking.
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