| 摘要 |
<p>A novel thermometric element and a novel process for determining the temperature of a body are disclosed. The thermometric element constitutes a plurality of separate compositions which have identical color arrayed in layers on an inert base. Each separate composition is suitable for recording changes in temperature by a visual change in color. Each separate composition comprises a mixture containing a first cholesteric liquid crystal system that exhibits color in the cholesteric state at a first temperature and changes from that state to a second state exhibiting a different color at a second, fixed phase transition temperature. There are a plurality of such systems identical in separate compositions, and a second component which is a chemical inert substance, miscible with the first system is present. The same second component, but differing in percents by weight thereof, is utilized in each composition, wherein the liquid crystal systems are identical. The differing amounts of the second component in each composition, wherein the liquid crystal systems are identical, are in a predetermined weight range in which there is predictable variability in the relationship between said phase transition temperature and the percent by weight of the second component in the composition.</p> |
