Compositions – Light transmission modifying compositions – Modification caused by energy other than light
Patent
1998-04-20
1999-07-06
Tucker, Philip
Compositions
Light transmission modifying compositions
Modification caused by energy other than light
252962, 106 3123, G02F 100, C09D 1100
Patent
active
059194049
ABSTRACT:
A reversible thermochromic composition comprising as essential components (a) an electron-donating color-developing organic compound, (b) at least one electron-accepting compound selected from alkoxyphenol compounds represented by Formula I: ##STR1## wherein R represents an alkyl group; and (c) a compound serving as a reaction medium capable of reversibly causing electron-donating/accepting reaction attributable to the components (a) and (b). This composition has a reversible metachromatic function that it presents a color-developed state when heated in a color-extinguished state and presents the color-extinguished state when temperature-dropped or cooled in the color-developed state, or that it begins to develop a color in the course of temperature drop after heating, having been triggered by its temperature rise when heated in a color-extinguished state, and returns to the color-extinguished state after it has presented a color-developed state in a maximum developed-color density.
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Fujita Katsuyuki
Ono Yoshiaki
The Pilot Ink Co., Ltd.
Tucker Philip
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