Optical temperature indicator

摘要

The invention relates to an optical temperature indicator. The indicator comprises an optically active layer of a transparent polymeric material in which liquid-crystalline material is dispersed. The molecules of the liquid-crystalline material form part of a polymeric structure via covalent bonds, for example as side-chain groups. The polymeric structure is preferably based on a siloxane. Such an indicator exhibits a good mechanical stability, while the opacity is preserved for a long period of time.