Freeze, thaw and refreeze indicators based on rapid reactions in the solid state

摘要

A freeze indicator, which is preferably a self-activating freeze indicator. The freeze indicator has a substrate with a freeze indicator composition coated thereon wherein the freeze indicator has a liquid diacetylene; and a catalyst or catalyst precursor and a protective cover.

主权项

1. A freeze indicator comprising:
a substrate; a freeze indicator composition on said substrate wherein said freeze indicator comprises: a liquid or solution of a diacetylene; a catalyst or catalyst precursor capable of polymerizing said diacetylene when it crystallizes from its solution or liquid state when cooled to a lower temperature; and a protective barrier.