Liquid crystalline thio-benzoic acid derivs. for dielectrics - esp. phenyl thio-benzoates, biphenyl thio-carboxylic acid esters and diphenylyl thio-benzoates

New thiobenzoates have formula (I):- (where R1 and R2 are 1-12C alkyl, alkoxy or alkyl mercapto, 2-12C alkanoyl, alkanoyloxy or alkoxycarbonyloxy, or one of these gps. is also -CN or -NO2. Nos. m and n are 1 or 2, provided n + m =3). (I) are either S-phenyl thiobenzoates, (Ia), biphenyl thiocarboxyl...

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Bibliographische Detailangaben
Hauptverfasser:	POHL,LUDWIG,.DR, KRAUSE,JOACHIM,.DR
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS ADHESIVES CHEMISTRY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DYES FREQUENCY-CHANGING MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS ORGANIC CHEMISTRY PAINTS PHYSICS POLISHES TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	New thiobenzoates have formula (I):- (where R1 and R2 are 1-12C alkyl, alkoxy or alkyl mercapto, 2-12C alkanoyl, alkanoyloxy or alkoxycarbonyloxy, or one of these gps. is also -CN or -NO2. Nos. m and n are 1 or 2, provided n + m =3). (I) are either S-phenyl thiobenzoates, (Ia), biphenyl thiocarboxylic acid esters (Ib) or S-biphenylyl thiobenzoates (Ic): (I) are used as mixing components of liquid crystalline dielectrics for electro-optical indicator elements, working in twisted nematic cells or by dynamic scattering or phase deformation. (I) form, either along or with other mesomorphs, liquid-crystalline phases having m.pts. up to room temp. and clarifying points at higher temps. than known comparable mixts. An example describes prepn. of 4-n-heptyl-thiobenzoic acid-S-4-n-pentyl-phenyl ester from 4-n-heptyl benzoyl chloride and 4-n-pentyl-thiophenol.