US 4,544,936 AGranted

Heat-sensitive recording sheet

AssigneeFuji Xerox Co., Ltd.

InventorNaoki Yokoi

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Abstract

A heat-sensitive recording sheet is disclosed, comprising a base having thereon a heat-sensitive layer which contains, as main components, at least two kinds of fluoran dye color formers selected from different groups and a developer which causes coloration of the color former by heating. The color image of the heat-sensitive recording sheet fades less under influence of heat or humidity. Further the heat-sensitive recording sheet has high whiteness and less fogging of the background.

Claims21

Dependent claims

A heat-sensitive recording sheet comprising a base having thereon a heat-sensitive recording layer which contains, as main components, a color former and a developer which causes coloration of said color former by heating, said color former is a mixture selected from the group consisting of:

(1) at least one of compounds (i) and (ii) as Component (A), and compound (iii) or (iv) as Component (B);
and
(2) compound (ii) as Component (A) and compounds (iii) and (iv) as Component (B)
said compound (i) being represented by the formula (I) ##STR7## wherein R.sub.1 represents a hydrogen atom, a methyl group, an ethyl group, a halogenated methyl group, a halogenated ethyl group, an alkoxyalkyl group, an acyloxyalkyl group, an allyl group, a propargyl group, a cyclohexyl group, an acetoxy group, a benzyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, or a phenyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, and R.sub.3 represents a hydrogen atom, a lower alkyl group, an alkoxy group, an aryl group, a halogen atom, a halogenated lower alkyl group or an acetoxy group;
said compound (ii) being represented by the formula (II) ##STR8## wherein R.sub.3 represents the same meaning as defined above, R.sub.5 represents a pyrrolidino group or a piperidino group, and R.sub.6 represents a hydrogen atom, a lower alkyl group, an alkoxy group or a halogen atom;
said compound (iii) being represented by the formula (III) ##STR9## wherein R.sub.3 represents the same meaning as defined above, R.sub.2 represents a hydrogen atom, a lower alkyl group, a haloalkyl group, an alkoxyalkyl group, an acyloxyalkyl group, an alkoxy group, an allyl group, a propargyl group, a cyclohexyl group, a benzyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, or a phenyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, and R.sub.7 represents a lower alkyl group, an alkoxy group or a halogen atom;
and
said compound (iv) being represented by the formula (IV) ##STR10## wherein R.sub.3 represents the same meaning as defined above, and R.sub.8 represents an alkyl group having three or more carbon atoms or a halogenated alkyl group having three or more carbon atoms.

5 more elements

(1) compound (i) as Component (A), at least one of compounds (iii) and (iv) as Component (B), and compound (V) as Component (C);
and
(2) compound (ii) as Component (A), compound (iv) as Component (B), and compound (v) as Component (C)
said compound (i) being represented by the formula (I) ##STR12## wherein R.sub.1 represents a hydrogen atom, a methyl group, an ethyl group, a halogenated methyl group, a halogenated ethyl group, an alkoxyalkyl group, an acyloxyalkyl group, an allyl group, a propargyl group, a cyclohexyl group, an acetoxy group, a benzyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, or a phenyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, and R.sub.3 represents a hydrogen atom, a lower alkyl group, an alkoxy group, an aryl group, a halogen atom, a halogenated lower alkyl group or an acetoxy group;
said compound (ii) being represented by the formula (II) ##STR13## wherein R.sub.3 represents the same meaning as defined above, R.sub.5 represents a pyrrolidino group or a piperidino group, and R.sub.6 represents a hydrogen atom, a lower alkyl group, an alkoxy group or a halogen atom;
said compound (iii) being represented by the formula (III) ##STR14## wherein R.sub.3 represents the same meaning as defined above, R.sub.2 represents a hydrogen atom, a lower alkyl group, a haloalkyl group, an alkoxyalkyl group, an acyloxyalkyl group, an alkoxy group, an allyl group, a propargyl group, a cyclohexyl group, a benzyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, or a phenyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, and R.sub.7 represents a lower alkyl group, an alkoxy group or a halogen atom;
said compound (iv) being represented by the formula (IV) ##STR15## wherein R.sub.3 represents the same meaning as defined above, and R.sub.8 represents an alkyl group having three or more carbon atoms or a halogenated alkyl group having three or more carbon atoms;
and
said compounds (v) being represented by the formula (V) ##STR16## wherein R.sub.2 and R.sub.3 represent the same meanings as defined above, R.sub.4 represents a substituent selected from the group as described in R.sub.2, but is a substituent different than the R.sub.2 substituent.

6 more elements

Dependencies are inferred from the claim text.

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Abstract

(1) at least one of compounds (i) and (ii) as Component (A), and compound (iii) or (iv) as Component (B);
and
(2) compound (ii) as Component (A) and compounds (iii) and (iv) as Component (B)
said compound (i) being represented by the formula (I) ##STR7## wherein R.sub.1 represents a hydrogen atom, a methyl group, an ethyl group, a halogenated methyl group, a halogenated ethyl group, an alkoxyalkyl group, an acyloxyalkyl group, an allyl group, a propargyl group, a cyclohexyl group, an acetoxy group, a benzyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, or a phenyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, and R.sub.3 represents a hydrogen atom, a lower alkyl group, an alkoxy group, an aryl group, a halogen atom, a halogenated lower alkyl group or an acetoxy group;
said compound (ii) being represented by the formula (II) ##STR8## wherein R.sub.3 represents the same meaning as defined above, R.sub.5 represents a pyrrolidino group or a piperidino group, and R.sub.6 represents a hydrogen atom, a lower alkyl group, an alkoxy group or a halogen atom;
said compound (iii) being represented by the formula (III) ##STR9## wherein R.sub.3 represents the same meaning as defined above, R.sub.2 represents a hydrogen atom, a lower alkyl group, a haloalkyl group, an alkoxyalkyl group, an acyloxyalkyl group, an alkoxy group, an allyl group, a propargyl group, a cyclohexyl group, a benzyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, or a phenyl group which may be substituted by a lower alkyl group, a lower alkoxy group, a halogen atom or a nitro group, and R.sub.7 represents a lower alkyl group, an alkoxy group or a halogen atom;
and
said compound (iv) being represented by the formula (IV) ##STR10## wherein R.sub.3 represents the same meaning as defined above, and R.sub.8 represents an alkyl group having three or more carbon atoms or a halogenated alkyl group having three or more carbon atoms.

5 more elements