Reversible thermochromic composition
First Claim
1. A reversible thermochromic composition which develops fluorescent colors, comprising a solubilized mixture of three components of (a) an electron-donating color-developing organic compound selected from the group consisting of, quinazoline, and bisquinazoline compounds, (b) an electron-accepting compound for the electron-donating color-developing organic compound, and (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range.
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Abstract
A reversible thermochromic composition develops fluorescent color of yellow, yellowish orange, orange, reddish orange, or red with a high color density and high color brightness, yet gives no residual color under non-color-developing conditions, and has remarkably improved light resistance. The reversible thermochromic composition, comprising a solubilized mixture of three components of (a) an electron-donating color-developing organic compound selected from pyridine types, quinazoline types, and bisquinazoline types of compound, (b) an electron-accepting compound for the electron-donating color-developing organic compound, and (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range.
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Citations
20 Claims
- 1. A reversible thermochromic composition which develops fluorescent colors, comprising a solubilized mixture of three components of (a) an electron-donating color-developing organic compound selected from the group consisting of, quinazoline, and bisquinazoline compounds, (b) an electron-accepting compound for the electron-donating color-developing organic compound, and (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range.
- 2. A thermochromic composition which develops fluorescent colors, comprising a solubilized mixture of four components of (a) an electron-donating color-developing organic compound selected from the group consisting of pyridine, quinazoline, and bisquinazoline compounds, (b) an electron-accepting compound for the electron-donating color-developing organic compound, (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range, and (d) one or more light stabilizer selected from UV absorbers, antioxidants, singlet oxygen quenchers, superoxide anion quenchers, ozone quenchers, and infrared absorbers.
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