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US 6,379,850 B1Granted
Rewritable thermosensible recording material, a production method thereof and a rewritable thermosensible recording medium
AssigneeMinolta Co., Ltd.
InventorsHideaki Ueda, Tsuyoshi Nozaki, Shoji Kotani
Life of this patent
Estimating the term…
Abstract
A rewritable thermosensible recording material shown by the following chemical formula. This recording material can be produced by condensing a derivative of dicarboxylic acid and cholesterol or by making halide dicarboxylic acid and cholesterol react to each other. By locating this material purely or as a mixture between a base layer and a transparent protective layer, a rewritable thermosensible recording medium can be obtained.
Claims13
A rewritable thermosensible recording medium comprising:
- a sheet-like base layer;
- and
- a recording layer which contains a chemical composition of at least two low molecular weight cholesteric liquid crystal compounds, the chemical composition exhibiting a cholesteric phase at a temperature higher than room temperature, the chemical composition reflecting light of a wavelength within a visible range depending on a threshold temperature, and the chemical composition being solidified while remaining in a reflective state thereof by being cooled rapidly from the threshold temperature, wherein the threshold temperature is not lower than 50° C.
Dependencies are inferred from the claim text.