Thermosensitive recording material
AssigneeRicoh Company, Ltd.
InventorsKeiichi Maruta, Yukihiro Yuyama
Life of this patent
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Abstract
A thermosensitive recording material is disclosed suitable for use in thermosensitive-recording-type tickets, including magnetic tickets, and thermosensitive-recording-type labels, comprising a support material; a thermosensitive coloring layer formed on the front side of the support material, which thermosensitive coloring layer comprises a leuco dye and an acidic material capable of coloring the leuco dye when heat is applied thereto; and a protective layer formed on the thermosensitive coloring layer, which protective layer comprises a polyvinyl alcohol with a saponification ratio ranging from 70% to 85% and is capable of preventing intrusion of materials which may discolor the thermosensitive coloring layer.
Claims15
A thermosensitive recording material comprising, in successive layers:
- a support material;
- a thermosensitive coloring layer formed on the front side of said support material, said thermosensitive coloring layer comprising a leuco dye and an acidic material, said acidic material being capable of causing said leuco dye to become colored when heat is applied thereto;
- and
- a protective layer formed on the front side of said thermosensitive coloring layer, said protective layer comprising polyvinyl alcohol having a saponification ratio in the range of from 70% to 85%.
In a thermosensitive recording material comprising a support and a thermosensitive coloring layer formed on the front side of said support, said thermosensitive coloring layer containing a leuco dye and an acidic material capable of coloring said leuco dye when heat is applied thereto, the improvement which comprises:
- a protective layer formed on and covering the front side of said thermosensitive coloring layer for protecting said thermosensitive coloring layer against the action of plasticizers contained in plastic films that contact said recording material, said protective layer comprising polyvinyl alcohol resin having a saponification ratio in the range of from 70% to 85%, said protective layer being thin so that it does not hinder coloring of said thermosensitive coloring layer when heat is applied to said protective layer to effect coloring of said coloring layer.
Dependencies are inferred from the claim text.