Transparent conductive piezoelectric film and touch panel
AssigneeKureha Corporation
InventorMakoto Imaji
Life of this patent
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Abstract
To suppress change in a surface resistance value under a high-temperature or high-humidity environment in a transparent conductive piezoelectric film including a transparent piezoelectric film made of a fluororesin. A transparent conductive piezoelectric film includes a transparent piezoelectric film made of a fluororesin, a transparent coating layer, and a transparent electrode stacked in this order. The total thickness of the coating layer is 0.6 to 4.5 μm. When the transparent conductive piezoelectric film is left to stand in a specific high-temperature environment, the ratio of a resistance value after being left in the environment to a ratio of a resistance value before being left in the environment is 1.30 or less.
Claims10
A transparent conductive piezoelectric film comprising, by sequentially stacking:
- a transparent piezoelectric film made of a fluororesin;
- a transparent coating layer;
- and
- a transparent electrode,
- wherein a thickness of the transparent piezoelectric film is from 20 μm to 200 μm,
- a total thickness of the transparent coating layer is 0.6 to 4.5 μm, and
- when the transparent conductive piezoelectric film is left in an environment of 85° C. for 250 hours, a ratio of a surface resistance value after being left in the environment to a surface resistance value before being left in the environment is 1.30 or less.
A method for manufacturing a transparent conductive piezoelectric film comprising:
- a step of forming a transparent coating layer having a total thickness of 0.6 to 4.5 μm on at least one surface of a transparent piezoelectric film made of a fluororesin;
- and
- a step of forming a transparent electrode,
- wherein, when the transparent conductive piezoelectric film is left in an environment of 85° C. for 250 hours, a ratio of a surface resistance value of the transparent electrode after being left in the environment to a surface resistance value of the transparent electrode before being left in the environment is 1.30 or less.
Dependencies are inferred from the claim text.