Temperature-Sensitive Indicator
AssigneeThermographic Measurements Ltd
InventorsBagavant Shikumar, Philippe Marrec
Life of this patent
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Abstract
A temperature-indicator product comprising a visual indicator comprising a thermochromic colour-memory composition and comprising an electron-donating colouring organic compound (A), an electron-accepting colouring organic compound (B) and reaction medium compound (C). The visual indicator comprises a first portion comprising a first thermochromic colour-change composition in its lower temperature state and a second portion comprising a second thermochromic colour-change composition in its higher temperature state. The product is useful as a tamper-evident indicator or as a freeze indicator.
Claims12
A temperature-indicator product comprising a visual indicator comprising a thermochromic colour-memory composition and comprising an electron-donating colouring organic compound (A), an electron-accepting colouring organic compound (B) and reaction medium compound (C).
A temperature indicator product according to any one of the preceding claims wherein the component C) comprises a compound of formula (I):
- wherein:
- R1, and R2 are independently selected from an optionally substituted linear or branched alkyl group, alkenyl group, alkoxy group, aryl group and an alkylene aryl group;
- having from 5 to 22 carbon atoms;
- X1 and X2 are independently selected from —OC(O)—, —CO2— and O;
- R3, R4 and R5 are independently selected from hydrogen and an optionally substituted linear or branched hydrocarbyl group;
- R6 is selected from hydrogen, halogen R3, —X1R1, optionally substituted aryl;
- Y1, Y2, Y3 and Y4 are independently selected from hydrogen, R3, —OR3 and halogen;
- a is 0 to 4;
- b is 0 or 1;
- x and y are independently 0 or 1.
A temperature indicator product according to any one of the preceding claims adapted for use as a tamper-evident indicator.
A temperature indicator product according to any one of the preceding claims adapted for use as low temperature or freeze indicator.
A label comprising a temperature indicator product according to any one of the preceding claims.
Dependencies are inferred from the claim text.