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US 5,308,824 AGranted
Recording material
AssigneeMitsubishi Paper Mills Limited
InventorsToshihiko Matsushita, Sadao Morishita
Life of this patent
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Abstract
The invention provides a recording material inhibited from alteration which comprises a substrate, an undercoat layer containing a white or light colored inorganic fluorescent pigment having an emission maximum wavelength of 400-700 nm and provided on one side of the substrate, and a recording layer provided on said undercoat layer. The recording layer may be a heat-sensitive layer or a pressure-sensitive layer. A magnetic recording layer comprising ferromagnetic powders may be provided on another side of the substrate.
Claims6
A thermosensitive recording material comprising:
- a support;
- an undercoat layer formed on one side of said support, said undercoat layer comprising a binder, an absorbent, non-fluorescent pigment, and a white or light colored inorganic fluorescent pigment, said fluorescent pigment having an emission maximum in the 400-700 nm range when illuminated with ultra-violet light;
- and
- a thermosensitive recording layer formed on said undercoat layer, said recording layer comprising a heat-meltable compound, a dye precursor, and a color developer, wherein unrecorded portions of said recording layer are opaque with respect to said undercoat layer, and further wherein when heat is applied to said recording layer, a portion of said heat-meltable compound is absorbed by said undercoat layer and said dye precursor and said color developer react to produce a color.
1 more element
Dependencies are inferred from the claim text.