| 摘要 |
PURPOSE:To obtain an electrochromic display element formed of a coloring membrane, which is excellent in coloring developing and discoloring characteristics and is in a colorless state when erased, by using a specific condensed tungstic acid contg. a peroxo or peroxide ion as a coloring material. CONSTITUTION:An electrochromic display element which uses a peroxo-contg. condensed tungstic acid of the chemical formula WO3.xCO2.yH2O2.XH2O (wherein 0<=x<=0.25; 0.05<=y<=1; 0.16<z<=3.5) or a condensed tungstic acid contg. a peroxo or a peroxide ion in which carbon constitutes a heteroatom. The condensed tungstic acid is easily soluble in a polar solvent such as water or alcohol unless it is heated at a temp. of 100 deg.C or above. When the soln. is applied onto a plate and dried at a temp. of 100 deg.C or above, a dehydration condensation reaction proceeds, which makes it difficult to dissolve in a polar solvent such as water, alcohol, propylene glycol, etc.
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