COLORING MATTER FORMING BODY MIXTURE AND PRESSURE SENSITIVE RECORDING MATERIAL

摘要

Mixtures of dye precursors which contain (a) the lactone of 2-carboxy-4,4'-bisdimethylaminobenzhydrol (I) and (b) crystal violet lactone and/or one or more fluoran lactones of the formula (II) where R1 is alkyl, R2 is alkyl, phenalkyl, unsubstituted or substituted phenyl or cycloalkyl, or is pyrrolidinyl, piperidinyl or morpholinyl, R3 is H or tert.-butyl, R4 is H or methyl, R5 is H, alkyl or phenalkyl and R6 is H, alkyl, phenalkyl, cycloalkyl or unsubstituted or substituted phenyl, or is pyrrolidinyl, piperidinyl or morpholinyl, possess improved lightfastness in pressure-sensitive recording systems.