use of optically active 1.3 - dioxolan - 4 - carbonsaeureestern as kind of dopants are in fluessigkristallmischungen, those containing fluessigkristallmischungen and new optically active 1.3 - dioxolan - 4 - carbonsaeureester.

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.