Carbonless duplicating systems

Claim 1

A pressure-sensitive carbonless duplicating system or thermal marking system containing a color-forming substance comprising a compound having the formula ##STR16## wherein: Q 4 is hydrogen or halo; Q 5 is the same as Q 4 ; or di-lower-alkylamino, halo or COX when Q 4 , Q 6 and Q 7 are each hydrogen; Q 6 is the same as Q 4 ; or di-lower-alkylamino, halo or COX when Q 4 , Q 5 and Q 7 are each hydrogen; Q 7 is the same as Q 4 ; X is hydroxy, benzyloxy, alkoxy having from 1 to 18 carbon atoms or OM where M is an alkali metal cation, an ammonium cation or a mono-, di- or trialkylammonium cation having from 1 to 18 carbon atoms; Y 1 , Y 2 , Y 3 and Y 4 are the same or different and are selected from the group consisting of hydrogen, halo, hydroxyl, lower-alkoxy, alkyl having from 1 to 9 carbon atoms, phenyl-lower-alkyl, COOR 4 and NR 5 R 6 where R 4 and R 5 are hydrogen or lower-alkyl and R 6 is hydrogen, lower-alkyl, cycloalkyl having from 5 to 7 carbon atoms, lower alkanoyl, phenylsulfonyl or lower-alkyl-substituted phenylsulfonyl; Z is a radical having the formula ##STR17## in which: R 1 is selected from the group consisting of hydrogen, halo, lower-alkyl, lower-alkoxy and di-lower-alkylamino; R 2 is lower-alkyl; and R 3 is selected from the group consisting of lower-alkyl, benzyl, phenyl, and phenyl substituted with a lower-alkyl or lower-alkoxy group.