Abstract: An electrostatic image developing toner, characterized by containing at least a resin, a coloring agent and a compound of the formula (1), ##STR1## wherein R.sub.1 and R.sub.2 are respectively independently a C.sub.1 -C.sub.18 alkyl group or an aralkyl group which may have a substituent, and X is a halogen ion, an aromatic sulfonic acid ion which may have a substituent or an aromatic carboxylic acid ion which may have a substituent.

Abstract: A heat sensitive recording sheet having a heat sensitive color forming layer wherein a mixture of fluoran compounds of the following formulas I and II is used as a color former; ##STR1## wherein R.sub.1 is a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, a tetrahydrofurfuryl group, a substituted or unsubstituted phenyl group or a cycloalkyl group, R.sub.2 is a hydrogen atom, a chlorine atom, a fluorine atom, a lower alkyl group, a lower alkoxy group, a lower alkoxyalkyl group, a phenyl group or a benzyl group, and R.sub.3 is a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, a lower alkyl group or an acyl group; and ##STR2## wherein each of R.sub.4 and R.sub.5 is a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, a substituted or unsubstituted phenyl group or a cycloalkyl group, or R.sup.4 and R.sub.5 may, together with the adjacent nitrogen atom, form a ring of the formula ##STR3## each of R.sub.6 and R.sub.

Abstract: A fluoran compound represented by general formula (I): ##STR1## wherein R.sub.1 represents a straight or branched alkyl group having 1 to 8 carbon atoms, a cyclohexyl (C.sub.1 -C.sub.2) alkyl group, a cyclohexyl group, a phenyl group which may be substituted by chlorine, an alkoxyalkyl group, a benzyl group which may be substituted by chlorine, or a hydrogen atom;, R.sub.2 represents a hydrogen atom, a halogen atom, a lower alkyl group having 1 to 4 carbon atoms, a phenyl group which may be substituted by chlorine, a benzyl group which may be substituted by chlorine, a lower alkoxy group or a lower alkoxyalkyl group; R.sub.3 represents a hydrogen atom, a chlorine atom, a fluorine atom or a lower alkyl group having 1 to 4 carbon atoms; and n is 2.

Abstract: A fluoran compound having the formula: ##STR1## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom, a straight chain or branched alkyl group having from 1 to 8 carbon atoms, a cyclohexyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted benzyl group, Q is ##STR2## (wherein X is a hydrogen atom, a halogen atom, or a straight chain or branched alkyl group having from 1 to 8 carbon atoms), ##STR3## (wherein X is as defined above), or --(CH.sub.2).sub.n OR.sub.4 (wherein R.sub.4 is a straight chain or branched alkyl group having from 1 to 8 carbon atoms, a cycloalkyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted benzyl group, and n is an integer of from 1 to 8), and R.sub.3 is a hydrogen atom, a halogen atom, a lower fluoroalkyl group, an acyl group, an alkoxy group, an alkoxyalkyl group, or a straight chain or branched alkyl group having from 1 to 8 carbon atoms.

Abstract: A fluoran compound represented by general formula: ##STR1## where each of R.sub.1 and R.sub.2 is a C.sub.1 -C.sub.4 alkyl group, a cycloalkyl group or an aryl group, or R.sub.1 and R.sub.2 may form together with N a saturated ring, R.sub.3 is a benzyl or phenyl group which may be substituted, and R.sub.4 is a C.sub.1 -C.sub.4 alkyl group.

Abstract: A heat sensitive record material comprising at least one colorless or light-colored electron donative dyestuff and at least one color developing agent represented by the general formula: ##STR1## where each of R.sub.1 and R.sub.2 is hydrogen atom, an alkyl group having from 1 to 5 carbon atoms, an alkoxy group having from 1 to 5 carbon atoms or a halogen atom, X is an alkyl group having from 1 to 5 carbon atoms or a halogen atom, Y is a hydroxyl group, an alkyl group having from 1 to 5 carbon atoms or a halogen atom, n is an integer of 1 to 3, and m is an integer of 1 to 4.

Abstract: A heat sensitive record sheet which comprises a coated layer comprising 2-anilino-3-methyl-6-dibutylaminofluoran.

Abstract: A heat sensitive record material comprising a support sheet and a record layer formed on the support sheet, the record layer being composed essentially of a colorless or light-colored fluoran compound, an acidic substance which is thermally reactive with the fluoran compound to develop a color and a binder, characterized in that said record layer contains an effective amount of at least one benzenesulfonamide compound represented by the general formula: ##STR1## where R.sub.1 is a hydrogen atom, a C.sub.1 -C.sub.5 alkyl group, an acetylamino group or a halogen atom, R.sub.2 is a hydrogen atom, a C.sub.1 -C.sub.5 alkyl group, a cyclohexyl group or a phenyl group which may be substituted and R.sub.3 is a C.sub.1 -C.sub.5 alkyl group, a cyclohexyl group or a phenyl group which may be substituted, provided R.sub.2 and R.sub.3 may form together with N a saturated ring.

Abstract: A heat sensitive record sheet which comprises a coated layer comprising 2-anilino-3-methyl-6-dibutylaminofluoran.