Diazo type thermosensitive recording material
AssigneeRicoh Company, Ltd.
InventorsMasanaka Nagamoto, Yoshihiro Koseki, Susumu Iwata
Life of this patent
Estimating the term…
Abstract
A diazo type thermosensitive recording material comprising a support material and a thermosensitive recording layer formed thereon, wherein the thermosensitive recording layer comprises a diazo compound, a coupler, a thermo-fusible or thermo-softening binder agent and a thermo-fusible material. The weight ratio of the diazo compound and the thermo-fusible material is in the range of 1:2 to 1:30, and both the diazo compound and the coupler exist as separate particles in the thermosensitive recording layer.
Claims18
A diazotype thermosensitive recording material, comprising:
- a support material and a thermosensitive recording layer formed thereon, said thermosensitive recording layer comprising (a) a diazonium compound selected from the group consisting of diazonium compounds having the formulas (IV) and (V):
- ##STR26## wherein R.sup.17, R.sup.18, R.sup.19, R.sup.21, R.sup.22 and R.sup.23 each is hydrogen, lower alkyl, lower alkoxy or halogen, R.sup.20 is hydrogen, lower alkyl or lower alkoxy;
- R.sup.4 is sulfur or oxygen;
- and Y.sup.1 and Y.sup.2 each represent a halogen ion, a fluorine-containing ion, or an acidic residue forming a double salt, in combination with a metallic salt, (b) a coupler consisting essentially of phloroglucinol, (c) a thermo-fusible or thermo-softening, film-forming binder and (d) a thermo-fusible material capable of promoting fusing said layer when heat is applied thereto to effect a speedy coloring reaction between said diazonium compound and said coupler, the weight ratio of said diazonium compound to said thermo-fusible material being in the range of 1:2 to 1:30, said thermosensitive recording layer has been formed by drying on said support, a dispersion comprising said diazonium compound, said coupler, said thermo-fusible or thermo-softening binder, said thermo-fusible material, and a solvent in which said diazo compound and said coupler are substantially insoluble, so that both said diazonium compound and said coupler exist as unconsecutive particles in said thermosensitive recording layer.
A diazotype thermosensitive recording material comprising a support material and a thermosensitive recording layer formed thereon, said thermosensitive recording layer comprising (a) a diazonium compound selected from the group consisting of diazonium compounds having the formula:
- ##STR29## wherein R.sup.21, R.sup.22 and R.sup.23 each is hydrogen, lower alkyl, lower alkoxy or halogen;
- R.sup.20 is hydrogen, lower alkyl or lower alkoxy and Y.sup.2 represents a halogen ion, a fluorine-containing ion, or an acidic residue forming a double salt, in combination with a metallic salt, (b) a coupler, (c) a thermo-fusible or thermo-softening, film-forming binder and (d) a thermo-fusible material capable of promoting fusing said layer when heat is applied thereto to effect a speedy coloring reaction between said diazonium compound and said coupler, the weight ratio of said diazonium compound to said thermo-fusible material being in the range of 1:2 to 1:30, said thermosensitive recording layer has been formed by drying on said support a dispersion comprising said diazonium compound, said coupler, said thermo-fusible or thermo-softening binder, said thermo-fusible material, and a solvent in which said diazo compound and said coupler are substantially insoluble, so that both said diazonium compound and said coupler exist as unconsecutive particles in said thermosensitive recording layer.
Dependencies are inferred from the claim text.