Hoechst Aktiengesellschaft

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Detlef Lotzsch

Gerd Heppke

Feodor Oestreicher

Christian Bahr

Rainer Wingen

Barbara Hornung

Dieter Ohlendorf

Claus Escher

Hans-Rolf Dubal

Gunter Scherowsky

Michael Morr

Arno Seeboth

The invention relates to a thermochromic polymer layer and also a method for production thereof. The method is based on addition of a thermochromic colorant and if necessary further additives at the beginning of the extrusion process and subsequent extrusion to form the thermochromic polymer layer. Furthermore, the invention relates to a multilayer composite system comprising at least one thermochromic polymer layer and also at least one further layer.

Thermochromic polymer layer and method for production thereof

Compounds of the formula (I) having side chains with multiple methyl branches

Compounds having side chains with multiple methyl branches and their use

The novel esters of a chiral alcohol and a mesogenic carboxylic acid are characterized by the general formula (I) ##STR1## in which the symbols have the following meanings: n denotes 0 or 1,

Chiral esters of mesogenic carboxylic acids in liquid crystal phases

Chiral esters of mesogenic carboxylic acids

Use of compounds or mixtures of compounds which have a chiral, orthogonal, more highly ordered smectic phase in the range of said phase as switching or indicating medium. Compounds which have a chiral, orthogonal, more highly ordered smectic phase, in particular an S.sub.B * or an S.sub.E * phase, can be used in the range of said phase or phases as indicating or switching medium in electro-optical indicating or switching components (devices) which are based on the exploitation of the electroclinic effect.

Use of compounds or mixtures of compounds which have a chiral,

The new esters derived from a chiral compound containing two OH groups and at least one mesogenic carboxylic acid which have the general formula (I) ##STR1## in which X.sup.1 =O--H or O--CO--(C.sub.1 to C.sub.12)alkyl and X.sup.2 =O--MC or X.sup.1 and X.sup.2 denote O-MC independently of each other, where MC is the molecular radical of a mesogenic monocarboxylic acid after splitting off an OH group. The esters or esters substituted in the aromatic part of the phenolic part preferably find application as an admixture intwistable liquid crystal phases in which they produce a temperature compensation and a high degree of twisting.

Chiral phenolic esters of mesogenic carboxylic acids and their use as

Growing community of inventors

Berlin, Germany

Detlef Lotzsch