用于冷冻指示器的变色乳液

Color-changing emulsions for freeze indicators

Abstract

A color-changing emulsion for use in a freeze indicator can employ a dispersion medium, for example, an aqueous liquid, a first reactant phase and a second reactant phase, which two reactant phases can both be dispersed in the dispersion medium. The first reactant phase includes a hydrophobic liquid and a first reactant, for example, a color precursor such as a leuco dye. The second reactant phase can include a hydrophobic liquid, and includes, or can be, a second reactant, for example, a color developer such as a leuco dye developer. The first and second reactant phases can be essentially unmixed, and can be co-reactable to provide a color change. In response to a freezing temperature, the color-changing emulsion can coagulate and change color irreversibly. An intense color change can be obtained by using, for example, a suitable leuco dye precursor and developer.
本发明涉及一种用于冷冻指示器中的变色乳液,所述变色乳液可以使用诸如水性液体的分散介质、第一反应物相和第二反应物相,其中两个反应物相均可分散于所述分散介质中。所述第一反应物相包括疏水性液体和第一反应物,例如颜色前体诸如隐色染料。所述第二反应物相可包括疏水性液体,并且包括或可以是第二反应物,例如彩色显影剂如隐色染料显影剂。所述第一反应物相和第二反应物相本质上可以是未混合的,并且可以共同反应以提供颜色变化。响应于冻结温度,所述变色乳液可以凝结并不可逆地改变颜色。通过使用例如合适的隐色染料前体和显影剂,可以获得强烈的颜色变化。

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