Patent · US Expired

Use of optically active 1,3-dioxolane-4-carboxylates as dopes in liquid-crystal mixtures, liquid-crystal mixtures containing these compounds, and novel optically active 1,3-dioxolane-4-carboxylates

US5641428A · kind A · utility

0Cited by

2References

6Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Rainer Wingen · Hattersheim, DE
Hans-Rolf Dubal · Königstein, DE
Claus Escher · Mühltal, DE
Wolfgang Hemmerling · Pocking, DE
Ingrid Muller · Niedernhausen, DE
Dieter Ohlendorf · Liederbach, DE

Key dates

Filing date	Apr 30, 1992
Grant date	Jun 24, 1997
Priority date	—
Expiry date	Apr 30, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09K19/588
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Optically active, mesogenic 1,3-dioxolane-4-carboxylates are suitable as dopes in liquid-crystal mixtures. They result in liquid-crystalline ferroelectric phases having short switching times and in electroclinic phases having large electroclinic coefficients. Their particular advantage is that they induce a helix of very large pitch, meaning that helix compensation by further dopes is unnecessary. In addition, the 1,3-dioxolane-4-carboxylates exhibit high UV stability.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.