Reversible thermosensitive recording medium and image forming and erasing method using the recording medium
First Claim
Patent Images
1. A reversible thermosensitive recording medium comprising:
- a substrate; and
a reversible thermosensitive recording portion comprising;
a recording layer on the substrate, which comprises an electron donating coloring compound and an electron accepting compound, wherein the recording layer achieves a colored state when heated at a temperature not lower than an image forming temperature and then cooled at a first cooling speed, and the recording layer in the colored state achieves a non-colored state when heated at a temperature lower than the image forming temperature and not lower than an image erasing temperature or when heated at a temperature not lower than the image forming temperature and then cooled at a second cooling speed relatively slow compared to the first cooling speed; and
a crosslinked polymer layer comprising a crosslinked polymer having an ultraviolet absorbing structure.
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Abstract
A reversible thermosensitive recording medium including a substrate; a reversible thermosensitive recording layer on the substrate, which includes an electron donating coloring compound and an electron accepting compound, wherein the recording layer achieves a colored state when heated at a temperature not lower than an image forming temperature and then cooled at a first cooling speed, and the recording layer in the colored state achieves a non-colored state when heated at a temperature lower than the image forming temperature and not lower than an image erasing temperature or when heated at a temperature not lower than the image forming temperature and then cooled at a second cooling speed relatively slow compared to the first cooling speed; and a crosslinked polymer layer including a crosslinked polymer having an ultraviolet absorbing structure.
149 Citations
26 Claims
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1. A reversible thermosensitive recording medium comprising:
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a substrate; and
a reversible thermosensitive recording portion comprising;
a recording layer on the substrate, which comprises an electron donating coloring compound and an electron accepting compound, wherein the recording layer achieves a colored state when heated at a temperature not lower than an image forming temperature and then cooled at a first cooling speed, and the recording layer in the colored state achieves a non-colored state when heated at a temperature lower than the image forming temperature and not lower than an image erasing temperature or when heated at a temperature not lower than the image forming temperature and then cooled at a second cooling speed relatively slow compared to the first cooling speed; and
a crosslinked polymer layer comprising a crosslinked polymer having an ultraviolet absorbing structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A reversible thermal image recording method comprising:
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providing a reversible thermosensitive recording medium comprising a recording layer on the substrate, which comprises an electron donating coloring compound and an electron accepting compound, wherein the recording layer achieves a colored state when heated at a temperature not lower than an image forming temperature and then cooled at a first cooling speed, and the recording layer in the colored state achieves a non-colored state when heated at a temperature lower than the image forming temperature and not lower than an image erasing temperature or when heated at a temperature not lower than the image forming temperature and then cooled at a second cooling speed relatively slow compared to the first cooling speed; and
a crosslinked polymer layer comprising a crosslinked polymer having an ultraviolet absorbing structure on the recording layer; and
imagewise heating the recording layer at a temperature not lower than the image forming temperature and then cooling at the first cooling speed to form an image in the recording layer.
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26. A reversible thermal image erasing method comprising:
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providing a reversible thermosensitive recording medium comprising a recording layer on the substrate, which comprises an electron donating coloring compound and an electron accepting compound, wherein the recording layer achieves a colored state when heated at a temperature not lower than an image forming temperature and then cooled at a first cooling speed, and the recording layer in the colored state achieves a non-colored state when heated at a temperature lower than the image forming temperature and not lower than an image erasing temperature or when heated at a temperature not lower than the image forming temperature and then cooled at a second cooling speed relatively slow compared to the first cooling speed; and
a crosslinked polymer layer comprising a crosslinked polymer having an ultraviolet absorbing structure on the recording layer; and
heating the recording layer at a temperature not higher than the image forming temperature and not lower than the image erasing temperature such that the recording layer achieves the non-colored state.
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Specification
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Current AssigneeRicoh Company Limited
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Original AssigneeRicoh Company Limited
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InventorsArai, Satoshi, Shibuya, Takeshi, Tsutsui, Kyoji, Furuya, Hiromi, Tatewaki, Tadafumi
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Primary Examiner(s)Hess, B. Hamilton
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Application NumberUS09/972,860Publication NumberTime in Patent Office615 DaysField of Search503/201, 503/209US Class Current503/201CPC Class CodesB41M 5/305 with reversible electron-do...B41M 5/3372 Macromolecular compoundsB41M 5/41 Base layers supports or sub...B41M 5/443 Silicon-containing polymers...B41M 5/46 characterised by the light-...
