Mitsubishi Paper Mills Limited

Hidekazu Sano

Jun Maruyama

Kazuyuki Iida

Mitsuhiro Ikeda

Shigetoshi Hiraishi

Masahiro Higuchi

Shoji Hizatate

Yasuro Yokota

Koichi Torizuka

Yukiko Shibuya

The present invention is to provide a reversible two-color heat-sensitive recording material which uses an electron-donative dye precursor which is usually colorless or a pale color and an electron-accepting compound, and a reversible heat-sensitive color-forming composition which is capable of forming a color-formation state and decolorization state relatively due to difference in heating temperature and/or cooling rate after heating is formed on a support, wherein the reversible heat-sensitive color-forming composition comprises at least two kinds of compositions having different color tones to be formed and the compositions are each present separately and in an independent state, and crystallization rates of the electron-donative compounds at the time of changing from the color-formation state to the decolorization state are different from each other.

Reversible two-color heat-sensitive recording material and recording method

Disclosed is a reversible heat-sensitive recording material comprising a support and a reversible heat-sensitive recording layer containing a dye precursor which is usually colorless or a pale color and a reversible color developing agent capable of causing a reversible change in color density of the dye precursor due to the difference in cooling rate after heating, and the reversible color developing agent is a compound represented by the following formula (I):

Reversible heat-sensitive recording material

Reversible heat sensitive recording material

Disclosed is a reversible heat-sensitive recording material comprising a substrate and a recording layer formed thereon, said recording layer comprising a colorless or light-colored, electron-donating dye precursor and a specific electron-accepting compound capable of causing a reversible color tone change of the dye precursor on heating.

As a reversible heat-sensitive recording material which contains a normally colorless or palely colored electron donating dye precursor and an electron accepting compound capable of causing said dye precursor to change reversibly in color density due to the difference in cooling rate after heating, one in which images can be formed and erased with good contrast and images high in time stability can be maintained under environment of everyday life can be obtained by using a phenolic compound having at least one aliphatic hydrocarbon group of 6 or more carbon atoms as the said electron donating compound.

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Tokyo, Japan

Hidekazu Sano