| 摘要 |
PURPOSE:To obtain the black picture of high density at a high speed, by a method wherein a specific phenol derivative is condensated by dehydration, then heated with a caustic alkali aqueous solution or ethylene glycol as occasion demands and thereafter, the color former refined with an organic solvent is used. CONSTITUTION:The pressure-sensitive or heat-sensitive recording paper manufac tured by combination of a fluoran derivative expressed by the formula and a developer is excellent in conservative stability, coloring properties, light resis tance and water resistance. Further, class 2 alkyl group of 3-13 in carbon number concerning carbon combined with nitrogen is expressed by R<1>, class 1 alkyl group of 1-4 in carbon number, alkenyl group of 3-4 in carbon number or alkoxy alkyl group of 3-4 in carbon number by R<2>, formly group, aliphatic acyl group of 2-5 in carbon number, benzoyl group capable of being substituted or carboalkoxy group of 2-5 in carbon number of R<3>, hydrogen or halogen by R<4> and methyl group, ethyl group, halogen group or hydrogen by R<5>. |
