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.
Claims19
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 having a thickness of from 0.5 to 15 .mu.m, said protective laye 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, said protective layer having a thickness of from 0.5 to 15 .mu.m, said protective layer comprising polyvinyl alcohol resin having a saponification ratio in the range of from 70% to 85%.
A thermosensitive recording material consisting essentially of, in successive layers:
- a support;
- a thermosensitive coloring layer formed on the front side of said support, said thermosensitive coloring layer comprising an acidic material, a leuco dye selected from the group consisting of triphenylmethane leuco dyes, fluoran leuco dyes, phenothiazine leuco dyes, Auramine leuco dyes and spiro-pyran leuco dyes, said acidic material being capable of coloring said leuco dye when heat is applied thereto, and a binder agent which comprises a water soluble organic polymer;
- and
- a protective layer having a thickness of from 0.5 to 15 .mu.m formed on and substantially completely covering the front of said thermosensitive coloring layer, said protective layer consisting essentially of a polyvinyl alcohol having a saponification ratio in the range of from 70% to 85%.
Dependencies are inferred from the claim text.