Heat sensitive color developing material

Claim 1

A heat sensitive color developing material comprising: (A) an electron donating color forming organic compound; (B) a heat activating compound selected from the group consisting of compounds I, II, and III, ##STR34## wherein R 1 is selected from the group consisting of H, --R, --OR, a halogen atom, and a nitro group, X is selected from the group consisting of AsF 6 , SbF 6 , BF 4 , PF 6 , ClO 4 , FeCl 4 , CF 3 SO 3 , RSO 3 , and RCOO--, wherein R is selected from the group consisting of alkyl and cycloalkyl of 1 to 12 carbon atoms substituted by --OH, ##STR35## wherein R 2 is independently selected from the group consisting of --COR, --R 1 , --OH, a cyano radical, and an amino radical, R 3 is selected from the group consisting of H, --R, and a halogen atom, A is selected from the group consisting of ##STR36## wherein R 4 is independently selected from the group consisting of an alkyl, alkenyl of 1 to 12 carbon atoms substituted by a group selected from the group consisting of hydroxy, carboxy, nitro, alkoxy, alkanoyloxy of 1 to 4 carbon atoms, a phenyl group substituted by one or more of a halogen atom, nitro, cyano, amino, --R, and --OR, wherein R, R 1 and X are as defined above, ##STR37## wherein R 5 is selected from the group consisting of H, --R, alkenyl of 2 to 3 carbon atoms and R 8 , R 6 is selected from the group consisting of --R, alkenyl of 2 to 3 carbon atoms and R 8 , R 7 is selected from the group consisting of H, hydroxy, --R, --OR, and --R 8 , wherein --R 8 is selected from the group consisting of phenyl and phenyl substituted by a group selected from the group consisting of halogen atom, hydroxy, nitro, cyano, --NHR, --R, and --OR, m is an integer of 1 to 4 and R and X are as defined above, and (C) a color developer selected from the group consisting of compounds IV, V, and a resin compound containing a chain of a t-butoxyphenyl group: ##STR38## wherein Ar is selected from the group consisting of benzene, naphthalene, and napthalene substituted by a group selected from the group consisting of t-butyl oxide and R 9 , and R 9 is selected from the group consisting of H, --R, --OR, --OCOR, a halogen atom and a nitro group, and R is as defined above; ##STR39## wherein R is as defined above.