Dye transfer type thermal printing sheets
AssigneesMatsushita Electric Industrial Co., Ltd., Mitsubishi Kasei Corporation
InventorsTetsuji Kawakami, Akihiro Imai, Nobuyoshi Taguchi, Yukichi Murata, Takao Hirota
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Abstract
A dye transfer thermal printing sheet which can give a color record image excellent in color reproducibility and weather resistance with middle shade including black and sufficiently saturated density. This printing sheet includes a substrate on which are arranged, in face-sequence, coloring material layers which are different in hue and contain at least one dye represented by the formula (I), at least one dye represented by the formula (II) and at least one dye represented by the formula (III).
Claims9
A dye transfer 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 formula (III):
- ##STR213## wherein R.sup.1 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 a fluorine atom, an arylcarbonylamino group or a halogen atom, R.sup.2 represents a hydrogen atom, an alkyl group which may be substituted with fluorine atom, an alkoxy group or a halogen atom, R.sup.3 and R.sup.4 each represents a hydrogen atom, an alkyl group which may be substituted with fluorine atom, an alkoxy group or a halogen atom and R, R.sup.5 and R.sup.6 each represents a hydrogen atom, a substituted or unsubstituted alkyl group of 1-8 carbon atoms or an aryl group;
- ##STR214## wherein R, R.sup.1 and R.sup.2 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, R.sup.3 represents a hydrogen atom, an alkoxy group of 1-4 carbon atoms, a methyl group or a halogen atom and R.sup.4 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;
- ##STR215## 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 --CH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 O--, CH.sub.2 CH.sub.2 OCH.sub.2 -- or CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 --.
Dependencies are inferred from the claim text.