Recording material
AssigneeKanzaki Paper Manufacturing Co., Ltd.
InventorsTetsuo Tsuchida, Tatsuya Meguro, Takaaki Kouro, Haruo Omura
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AssigneeKanzaki Paper Manufacturing Co., Ltd.
InventorsTetsuo Tsuchida, Tatsuya Meguro, Takaaki Kouro, Haruo Omura
Estimating the term…
The present invention provides a recording material utilizing a reaction between a colorless or light-colored dye precursor and a color developer capable of forming a color upon coming into contact with the dye precursor, the recording material being characterized in that the material comprises at least one compound serving as the dye precursor and represented by the formula (1), and an acidic substance serving as the color developer ##STR1## wherein R.sub.1 to R.sub.6, p and q are defined in the specification. At least one selected from the group consisting of phenolic compounds of the formulae (10), (11) and (12) and phenolic resin having a partial structure of the formula (13) can be used, as required, to further improve the color forming properties and change the color of recorded images from reddish purple or purple to blue or dark blue.
A recording material utilizing a reaction between a colorless or light-colored dye precursor and a color developer capable of forming a color upon coming into contact with the dye precursor, the recording material being characterized in that the material comprises at least one pyrazalone compound serving as the dye precursor and represented by the formula (1), and at least one compound selected from the group consisting of an aromatic carboxylic acid and a polyvalent metal salt thereof serving as the color developer ##STR9## wherein R.sub.1 is alkyl, alkoxyalkyl, aryl or aryl having a substituent, R.sub.2 and R.sub.3 are each alkyl, alkyl having a substituent, aryl or aryl having a substituent, R.sub.4 is alkyl, alkyl having a substituent, aryl, aryl having a substituent, amino or amino having a substituent, R.sub.5 and R.sub.6 are each alkyl, alkoxyl or a halogen atom, p is 0 or an integer of 1 to 5, and q is 0 or an integer of 1 to 4.
Dependencies are inferred from the claim text.