| 摘要 |
<p>A urea-urethane compound represented by the following formula; a process for producing the compound; a color developer comprising the urea-urethane compound; and a color former containing a colorless or light-colored leuco dye. (In the formula, R represents a residue of an aliphatic compound, etc.; and A1 and A2 each represents an optionally substituted residue of an aromatic compound, etc.)</p> |
