Patent ID: 6861388

Claim:
A recording paper comprising a paper support having a front surface and a rear surface opposite the front surface and a recording layer formed on the front surface of the paper support, the paper support having a ribbon-shaped security element embedded therein, the ribbon-shaped security element having a front surface facing the front surface of the paper support and a rear surface facing the rear surface of the paper support, and the recording paper being characterized in that: the distance from the front surface of the paper support to the front surface of the security element is 1 to 7 times the thickness of the security element; the distance from the rear surface of the paper support to the rear surface of the ribbon-shaped security element is 0.5 to 6 times the thickness of the security element; the thickness of the paper support is 4 times to 10 times the thickness of the ribbon-shaped security element; the thickness of the paper support is 40 to 250 μm; the ribbon-shaped security element has a width of 0.3 mm to 20 mm and a thickness of 10 μm to 40 μm; and the recording layer is a heat-sensitive recording layer comprising an electron-donating compound, an electron-accepting compound and a binder.