| 摘要 |
PURPOSE:To provide a heat-sensitive recording paper which forms a color with a black color tone when in contact with an acidic substance and provides a recorded image having excellent resistance to light and water, by providing a specified derivative of fluoran on a base as an electron-donative color former. CONSTITUTION:A derivative of fluoran of formulaI[where each of R<1> and R<2> is 1-8 C alkyl; R<3> is cycloalkyl, cyanoethyl, carbamidoethyl, carbalkoxyethyl, (tetrahydro)furfuryl or the like](e.g., a compound of formula II) is provided on the base as an electron-donative color former together with a film-forming agent or the like to obtain the objective recording paper. The compound of formulaIis obtained, for example, by bringing a compound of formula III and a derivative of phenol of formula IV (where R is H, 1-4 C alkyl) into reaction by using a dehydrating-condensing agent at a temperature of -5-90 deg.C, followed by pouring the reaction product into water and treating with an alkali to crystallize the objective compound. EFFECT:Storage stability and color-forming property are enhanced. |
