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AssigneeOki Electric Industry Co., Ltd.
InventorsYutaka Okabe, Yoichi Nishioka, Yukihisa Okada
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A thermoreversible recording material having its transparency changed in accordance with its thermal history, in particular the rate of cooling and the temperature to which it has been heated, comprises a matrix material and an organic compound of low molecular weight, wherein the matrix material comprises polyvinyl acetal, and the organic compound of low molecular weight comprises a saturated carboxylic acid or derivative thereof. The matrix material may further contains a material selected from a group consisting of epoxy resin, phenol resin, epoxy compound, aldehyde compound and isocyanate compound. A thermoreversible recording medium comprising the above thermoreversible recording material may be selectively heated by a thermal head or the like to record visual information. The visual information may be erased by heating the medium and cooling it slowly.
A thermoreversible recording material comprising a matrix material and an organic compound of low molecular weight, the transparency of which is changed in accordance with its thermal history, characterized in that the matrix material is polyvinyl acetal and the organic compound of low molecular weight is at least one selected from the group consisting of a saturated carboxylic acid, an amide-, an amine-, an anilide-, an alcohol-, an ester-, a ketone-, a metal salt-, and an imidazole of the saturated carboxylic acid.
A thermoreversible recording medium comprising:
A recording method comprising the steps of:
A recording method comprising the steps of:
Dependencies are inferred from the claim text.