| 摘要 |
PROBLEM TO BE SOLVED: To provide an optically coherent crushed material which can develop an enough color, be mixed with ink and paint to be used for printing, application, coloring by being incorporated into plastics, etc., to create specific design, and be used for the prevention of forgery. SOLUTION: In the optically coherent crushed material, two resin layers having thicknesses of 0.05-0.3μm and different refractive indices are laminated alternately to form at least 11 layers, at least one resin layer is different in thickness between respective resin layers, and the value obtained by dividing the thickness of the thickest resin layer by the thickness of the thinnest resin layer is≥1.3. In at least one resin layer, a multi-layer laminated stretched film stretched in at least one direction in the laminated state is crushed. COPYRIGHT: (C)2005,JPO&NCIPI
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