| 摘要 |
PURPOSE:To provide a novel sulfonyl compound useful as a color-developing agent giving heat-sensitive recording materials, high in sensitivity, and excellent in storage stability. CONSTITUTION:A sulfonyl compound is expressed by formula I, namely alpha,alpha'- bis[4-(p-hydroxyphenylsulfonyl)phenoxy]-p-xylene of formula II, alpha,alpha'-bis[4-(p- hydroxyphenylsulfonyl)phenoxy]-m-xylene of formula III, or alpha,alpha'-bis[4-(p- hydroxyphenylsulfonyl)phenoxy]-o-xylene. The compound of formula I is obtained by reacting a compound of formula V (X is Cl, Br) with 4,4'- dihydroxydiphenylsulfone in the presence of a basic substance in water or in an organic solvent containing the water. A recording material obtained from the new compound of formula I is excellent in a color-generating property, water resistance and plasticizer resistance, and is little in the fogging of the colored texture with time. |
