FLUORAN COMPOUND, ITS CRYSTALLINE TOLUENE-ADDUCT, PRODUCTION THEREOF, AND RECORDING MATERIAL CONTAINING THE SAME

摘要

PURPOSE:To prepare the title compd. which quickly develops color at low temp., has a high solubility in a capsule oil, and is suitable as a pressure- sensitive recording material by reacting a specific benzoic acid deriv. with a specific diphenylamine deriv. CONSTITUTION:A benzoic acid deriv. of formula I (wherein R1 and R2 are each cyclohexyl or n-butyl provided that they are different from each other) is made to react with a diphenylamine deriv. of formula II (wherein R3 is lower alkyl) to give a fluoran compd. of formula III (wherein R1 and R2 are as described above) (e.g. a compd. of formula IV, V, or VI), which develops color quickly at low temp. when compared with a conventional fluoran compd. and has a high solubility in a capsule oil and properties sufficient as a pressure- sensitive recording material.