Patent ID: 8067483
Filing Date: 2011-11-29
Classification: C09D,Y10T

Abstract:
1. A thermally reactive indicator ink responsive to ambient temperatures providing a visual indication of a cumulative time-temperature exposure, the thermally reactive indicator ink comprising: a) about 40 to about 95 weight percent of a liquid vehicle, based on the weight of the thermally reactive indicator ink; b) about 1 to about 30 weight percent, based on the weight of the thermally reactive indicator ink, of a solid particulate diacetylenic indicator agent; wherein the solid particulate diacetylenic indicator agent is insoluble in the liquid vehicle, is polymerizable upon exposure to heat, and is a 5,7-dodecadiyn-1,12 diol bis(n-octadecyl urethane) or a co-crystallized mixture of two or more 2,4-hexadiyn-1,6-bis(alkylurea) compounds, wherein the alkyl substituents of the 2,4-hexadiyn-1,6-bis(alkylurea) compounds are linear alkyl substituents selected from the group consisting of ethyl, propyl, butyl, octyl, dodecyl, and octyldecyl; and c) a non-gaseous reactivity-enhancing adjuvant being effective to enhance the ambient temperature thermal reactivity of the indicator agent; wherein the non-gaseous reactivity-enhancing adjuvant comprises: