Dye transfer type thermal printing sheets

Claim 1

A dye transfer type thermal printing sheet which comprises coloring material layers different in hue and arranged in sequence on a substrate, said coloring material layers containing respectively a binder and at least one sublimable cyan dye represented by the following formula (I), a binder and at least one sublimable magenta dye represented by the following formula (II) and a binder and at least one sublimable yellow dye selected from the dyes represented by the following formulas (III)-(VI): wherein R¹ represents a hydrogen atom, an alkyl group which may be substituted with fluorine atom, an alkoxy group, a formylamino group, an alkylcarbonylamino group which may be substituted with fluorine atom, an aryl­carbonylamino group or a halogen atom, R² represents a hydrogen atom, an alkyl group which may be substituted with fluorine atom, an alkoxy group or a halogen atom, R³ and R⁴ each represents a hydrogen atom, an alkyl group which may be substituted with fluorine atom, an alkoxy group or a halogen atom and R⁵ and R⁶ each represents a hydrogen atom, a substituted or unsub­stituted alkyl group of 1-8 carbon atoms or an aryl group; wherein R, R¹ and R² each represents an allyl group, an alkyl group of 1-8 carbon atoms, an alkoxyalkyl group of 3-8 carbon atoms, an aralkyl group or a hydroxyalkyl group, R³ represents a hydrogen atom, an alkoxy group of 1-4 carbon atoms, a methyl group or a halogen atom and R⁴ represents a methyl group, a methoxy group, a formyl­amino group, an alkylcarbonylamino group of 1-8 carbon atoms, an alkylsulfonylamino group of 1-8 carbon atoms or an alkoxycarbonylamino group of 1-8 carbon atoms; wherein R represents an allyl group, a methyl group, an ethyl group or a straight chain or branched chain propyl group or a straight chain or branched chain butyl group and A represents -CH₂-, -CH₂CH₂-, -CH₂CH₂O-, CH₂CH₂OCH₂- or -CH₂CH₂OCH₂CH₂-; wherein X represents a hydrogen atom or a halogen atom and R represents an alkyl group, an aralkyloxyalkyl group which may be substituted, an allyloxyalkyl group which may be substituted, an aryloxyalkyl group which may be substituted, a tetrahydrofurfuryl group, a furfuryl group, a cycloalkyl group, an allyl group, an aralkyl group or an alkoxyalkyl group; wherein X represents a hydrogen atom or a halogen atom and R¹ and R² each represents a hydrogen atom, an alkyl group, an alkoxyalkyl group, a cycloalkyl group, an allyl group, an aryl group which may have substituent, an aralkyl group, a furfuryl group, a tetrahydrofurfuryl group or a hydroxyalkyl group; wherein represents a phenyl group which may be substituted with an alkyl group of 1-13 carbon atoms, an alkoxy group of 1-12 carbon atoms, a halogen atom, a nitro group, a cyano group, an alkoxycarbonyl group of 2-13 carbon atoms or a benzyloxycarbonyl group and R represents a straight chain or branched chain alkyl group of 1-12 carbon atoms, a lower alkoxyalkyl group, an allyl group or a hydrogen atom.