Temperature-indicating label

Abstract

This temperature-indicating label is provided with: a base material; an adhesive layer to be affixed to the surface of a living body; and a temperature-indicating ink layer that is positioned between the base material and the adhesive layer, and that is configured so as to change color in accordance with the temperature of the temperature-indicating ink layer. The stress at 20% stretching is 0.2 N / mm2 to 10.0 N / mm2. The thickness of the temperature-indicating ink layer is 1-9 µm. In a state in which the adhesive layer is affixed to a white plate, the color difference ΔE* ab in the L*a*b* color space between a first state in which the temperature-indicating ink layer exhibits a first color and a second state in which the temperature-indicating ink layer exhibits a second color different from the first color is greater than 10. The color change between the first color and the second color is visible via the base material.

Claims

1. The material comprises a base material, an adhesive layer that is attached to a biological surface, and a thermochromic ink layer located between the base material and the adhesive layer, configured to change color according to the temperature of the thermochromic ink layer, wherein the stress at 20% elongation is 0.2 N / mm. ２ 10.0N / mm or more ２ The following conditions apply: the thickness of the thermochromic ink layer is 1 μm or more and 9 μm or less; and when the adhesive layer is attached to a white plate, the L between a first state in which the thermochromic ink layer exhibits a first color and a second state in which the thermochromic ink layer exhibits a second color different from the first color ＊ a ＊ b ＊ Chromatic difference ΔE in color space ＊ ａｂ However, the temperature-indicating seal is configured such that the color change between the first color and the second color is greater than 10 and can be visually observed through the substrate.

2. The temperature-indicating seal according to claim 1, wherein the base material is made of polyurethane resin and the maximum length of the base material is 10 mm or more.

3. The maximum length of the base material is 30 mm or more, the maximum length of the thermochromic ink layer is 30 mm or more, and the L ＊ a ＊ b ＊ In the color space, the L value in the first state is 76.3 or less, and the L ＊ value is 76.3 or less. The L ＊ a ＊ b ＊ In the color space, the L value in the second state is 91.8 or less. The thermochromic seal according to claim 2 ＊ value is 91.8 or less. The thermochromic seal according to claim 2 4. Said L ＊ a ＊ b ＊ In the color space, L in the first state ＊ The value is 48.3 or higher, and the L ＊ a ＊ b ＊ In the color space, L in the second state ＊ The temperature-indicating seal according to claim 3, wherein the value is 74.7 or higher.

5. Said L ＊ a ＊ b ＊ In the color space, a in the first state ＊ The value is 1.02 or greater, b ＊ The value is -24.98 or less, and the L ＊ a ＊ b ＊ In the color space, a in the second state ＊ The value is -0.59 or greater, b ＊ A temperature-indicating seal according to claim 3 or 4, wherein the value is -6.05 or less.

6. The thermochromic seal according to any one of claims 1 to 4, wherein the thickness of the adhesive layer is 5 μm or more and 30 μm or less, and the peel strength of the thermochromic seal is 0.5 N / 25 mm or more.

7. The thermochromic seal according to any one of claims 1 to 4, further comprising a printing layer located between the substrate and the thermochromic ink layer, configured so as not to cause a change in color in response to the temperature of the printing layer, wherein the color exhibited by the printing layer is configured to be visible through the substrate, the printing layer overlaps a part of the substrate when viewed from a viewpoint opposite to the plane on which the substrate extends, and the thermochromic ink layer exhibits the same color as the printing layer when the thermochromic ink layer exhibits one of the first and second colors, and exhibits a different color from the printing layer when the thermochromic ink layer exhibits the other of the first and second colors.

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