| 摘要 |
PURPOSE:To increase the stable storage of a recorded image significantly without deterioration of the degree of whiteness or the fogging of a developed color by adding 4,4'-diaminodiphenyl sulfone to a recording layer. CONSTITUTION:4,4'-diaminodiphenylsulfone has a structure shown by the formula, and the blending ratio of a compound is adjusted within the range of 1 to 500 pts.wt. of 100 pts.wt. of coloring agent. in addition, the recommendable basic dyes which constitute a recording layer are 3-dibutylamino-6-methyl-7- phenyiaminofluoran and 3-dibutylamino-7-(o-chiorophenylamino)fluoran. The coloring agents combined for use are 4-tert-butylphenol, of alpha-naphthol and beta-naphthol. The coating liquid is prepared by dispersing dye, coloring agent, and 4,4'- diaminodiphenylsuifone with water as a dispersant. This prepared liquid is applied using a coating device and dried to form a recording layer. |
