USE OF ESTERS OF 1,3-DIOXOLANE-4-CARBOXYLLIC ACIDS OPTICALLY ACTIVE AS ADULTERATING MATERIALS IN LIQUID CRYSTAL MIXTURES, LIQUID CRYSTAL MIXTURES CONTAINING THEM, AND NEW 4-DIOXOLYLANIC ACID ESTERS.

摘要

Optically active and mesogenic 1,3-dioxolane-4-carboxylic esters are suitable for use as dopants in liquid crystal mixtures. They lead to liquid-crystalline ferroelectric phases having short response times and to electroclinic phases having large electroclinic coefficients. Their particular advantage is that they induce a helix of very large pitch, so that there is no need for any helix compensation by other dopants. Moreover, the 1,3-dioxolane-4-carboxylic esters exhibit high UV stability.