Mesogenic menthol derivatives for thermochromic liquid crystalline media and inks

摘要

An ink comprises a thermochromic liquid crystalline media comprising at least one optically inactive nematic component and at least one optically active component, the improvement wherein is that the optically active component comprises at least one menthol derivative of formula I is 1,4-phenylene optionally substituted by up to 4 fluorine atoms or 1,4-cyclohexylene and MG is a mesogenic group, or forms a mesogeic group with The media may be used in electro-optic and temperature indicating devices and in surface thermography (eg for breast cancer detection). Compounds of formula I wherein the ring A DEG is 1,4-cyclohexylene are new.