| 摘要 |
<p>Disclosed is a material for the measurement of a pressure, which comprises a plastic substrate, a color former layer comprising an electron-releasing colorless dye precursor and a color developer layer comprising an electron-accepting compound, and which can develop a color by utilizing the color-developing reaction between the electron-releasing colorless dye precursor and the electron-accepting compound, wherein the electron-releasing colorless dye precursor is enclosed in a microcapsule having an urethane bond, wherein at least one of the electron-accepting compounds is a metal salicylate having a substituent, and wherein the microcapsule meets the requirement represented by the following formula:δ/D = 1.0 x 10to 2.0 x 10[whereinδrepresents a number average wall thickness (μm) of the microcapsule; and D represents a volume median diameter (μm) of the microcapsule].</p> |
