| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a laser marking sheet for cards which carries clear marking of characters, codes, images and the like. <P>SOLUTION: This laser marking sheet for cards is a single layer sheet, including a resin composition which contains both a black substance which may disappear or discolor itself by receiving of laser beam and a white substance less likely to be affected by receiving of laser beam in its thermoplastic resin. The above black substance is at least one type selected from a group consisting of carbon black, titanium black and black iron oxide, while the white substance is at least one type selected from a group consisting of white dye and white pigment. This white substance is composed of the resin composition containing at least one type thermoplastic resin selected from a group consisting of acrylic resin, polycarbonate resin, styrene resin and noncrystalline aromatic polyester resin, and both of those above black/white substances, with thickness of 100-300 μm. <P>COPYRIGHT: (C)2013,JPO&INPIT |
