| 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: d/D = 1.0 OE10-3 to 2.0 OE10-2 [wherein d represents a number average wall thickness (µm) of the microcapsule; and D represents a volume median diameter (µm) of the microcapsule ].</p> |
