Marking systems containing 3-aryl-3-heterylphthalides and 3,3-bis(heteryl)phthalides

Claim 1

A pressure-sensitive carbonless duplicating system or thermal marking system containing as a color-forming substance a 3-X-3-Z-4-R°-5-R 1 -6-R 2 -7-R 3 -phthalide of the formula ##STR29## wherein: R°, R 1 , R 2 and R 3 each represent hydrogen or halo or when R°, R 3 and one of R 1 and R 2 are each hydrogen, the other of R 1 and R 2 represents ##STR30## in which B represents -OY or ##STR31## wherein Y is hydrogen, an alkali metal cation, an ammonium cation, a C 1 to C 18 mono-, di- or trialkylammonium cation, C 1 to C 18 alkyl, C 2 to C 18 alkenyl, benzyl or benzyl substituted in the benzene ring thereof by C 1 to C 12 alkyl, halo or C 1 to C 8 alkoxy; Y' is hydrogen or C 1 to C 18 alkyl; Y" is hydrogen, C 1 to C 18 alkyl or C 4 to C 12 N,N-dialkylaminoalkyl; X represents a monovalent moiety selected from the class having the formulas ##STR32## Z represents a monovalent moiety selected from the class having the formulas ##STR33## in which R represents non-tertiary C 1 to C 4 alkyl, benzyl or benzyl substituted in the benzene ring by one or two of halo or C 1 to C 3 alkyl, R 4 represents acetamido, dialkylamino in which alkyl is non-tertiary C 1 to C 4 alkyl, and when one of R 1 or R 2 represents said ##STR34## R 4 further represents hydrogen, C 1 to C 3 alkyl, C 1 to C 4 alkoxy or halo, R 5 and R 5' represent hydrogen, C 1 to C 3 alkyl or phenyl, R 6 and R 6' represent hydrogen, C 1 to C 18 alkyl, C 2 to C 4 alkenyl, benzyl or benzyl substituted in the benzene ring by one or two of halo or C 1 to C 3 alkyl, R 7 and R 8 represent hydrogen, C 1 to C 3 alkyl or phenyl, and Y 1 and Y 1' represent one or two of hydrogen, C 1 to C 3 alkyl, C 1 to C 3 alkoxy, halo or nitro with the provisos (i) that X and Z can both simultaneously represent monovalent indolyl moieties only when one of R 1 and R 2 represents said ##STR35## and (ii) X represents a pyrrolyl or a carbazolyl moiety only when Z represents a 2-R 4 -4-N(R) 2 -phenyl moiety.