Thermal recording material
AssigneeMitsubishi Paper Mills Limited
InventorShoji Hizatate
Life of this patent
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Abstract
Provided is a thermal recording material that is excellent in thermal response and retainability of an image portion and which generates fewer residues adhering to the thermal head of a thermal printer. The thermal recording material having a thermal recording layer comprising a generally colorless or light-colored electron-donating dye precursor and an electron-accepting developer that reacts under heat to cause said dye precursor to form a color, said thermal recording layer containing a specific diphenylsulfone derivative, a specific amide derivative and a specific fluorane derivative, wherein the weight ratio of the specific diphenylsulfone derivative above and the specific amide derivative above is 2/1 to 1/2.
Claims7
A thermal recording material having a thermal recording layer comprising a generally colorless or light-colored electron-donating dye precursor and an electron-accepting developer that reacts under heat to cause said dye precursor to form a color, said thermal recording layer containing
- a diphenylsulfone derivative of the general formula (1),
- wherein each of R1 and R2 may be the same as, or different from, other and is a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an aralkyl group, an aryl group or an arylsulfonyl group, m is an integer of 1 to 3, and n is an integer of 0 to 2,
- an amide derivative of the general formula (2),
- wherein A is an alkyl group, an alkenyl group or an alkylamino group, each of R3 and R4 may be the same as, or different from, other and is a hydrogen atom, an alkyl group, an alkenyl group, an aralkyl group or an aryl group, and
- a fluorane derivative of the general formula (3),
- wherein each R5 and R6 may be the same as, or different from, other and is an alkyl group having 1 to 5 carbon atoms, a cyclohexyl group or an aryl group, R7 is a hydrogen atom, methyl, trifluoromethyl or a halogen atom and R8 is a hydrogen atom, methyl or a halogen atom,
- wherein the weight ratio of the diphenylsulfone derivative of the general formula (1) and the amide derivative of the general formula (2) (compound (1)/compound (2)) is 2/1 to 1/2.
Dependencies are inferred from the claim text.