초록 ▼

A composition having regulated occurrence of opacity and clarity at selected temperatures; method of making and using such a composition to create a temperature-indicating device by filling the composition in a suitable container of transparent material and having a background in the form of a color

A composition having regulated occurrence of opacity and clarity at selected temperatures; method of making and using such a composition to create a temperature-indicating device by filling the composition in a suitable container of transparent material and having a background in the form of a color, a letter or a number i.e., in order to be able to visually interpret the difference between opacity and clarity. A reversible indicating device is made which can show if the upper or lower limits of a pre-set temperature interval has been exceeded or fallen below.

대표청구항 ▼

A composition having opacity below a selected temperature interval and clarity above the temperature interval, wherein said composition consists essentially of (A) at least one component I having a melting point higher than the temperatures in the temperature interval; (B) at least one component II

A composition having opacity below a selected temperature interval and clarity above the temperature interval, wherein said composition consists essentially of (A) at least one component I having a melting point higher than the temperatures in the temperature interval; (B) at least one component II in which component I is soluble, said component II having a melting point lower than the temperatures in the temperature interval; and (C) at least one surface active agent; wherein component I is present in an amount sufficient for the composition to exhibit opacity on cooling and clarity on warming within a temperature range and the temperature range is greater than said temperature interval; and wherein said composition has opacity within the temperature range when said surface active agent is absent, and said surface active agent is present in said composition in an amount sufficient to narrow the temperature range within which said composition has opacity to said temperature interval. A method of determining the interval of temperatures at which a composition reversibly exhibits opacity and clarity, wherein said method comprises (A) providing at least one component II having a melting point lower than said temperature interval; (B) adding to component II a known amount of at least one component I, which is soluble in component II and which has a melting pont higher than said temperature interval; wherein component I is present in an amount sufficient for the composition to exhibit opacity on cooling and clarity on warming within the temperature interval; and (C) alternately heating and cooling the resulting composition over a range of temperatures and observing the interval of temperatures, corresponding to the known amount of component I, within which the composition reversibly exhibits opacity and clarity.