Melt processible thermotropic liquid crystalline terpolyesters and process for the preparation thereof

The invention relates to a process for the preparation of melt processable liquid crystalline terpolyesters of the general formula Iby the in situ acetylation of a monomer selected from (4-hydroxyphenyl) acetic acid/ 3(4-hydroxyphenyl)propionic acid and hydroquinone/4,4'-biphenol/2,6-naphthylen...

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Bibliographische Detailangaben
Hauptverfasser:	PILLAI CHENNAKKATTU KRISHNA SADASIVAN, RAVINDRANATHAN MARAYIL, PRASAD VADAKKETHONIPPURATHU SIVANKUTTY NAIR
Format:	Patent
Sprache:	eng
Schlagworte:	CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PRINTED CIRCUITS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	The invention relates to a process for the preparation of melt processable liquid crystalline terpolyesters of the general formula Iby the in situ acetylation of a monomer selected from (4-hydroxyphenyl) acetic acid/ 3(4-hydroxyphenyl)propionic acid and hydroquinone/4,4'-biphenol/2,6-naphthylene diol followed by acidolysis polycondensation with or without a solvent and a catalyst, under reduced pressure for the efficient removal of acetic acid to effect higher molecular weight formation. Post polymerisation is effected at higher temperatures below the decomposition temperature purification by soxhlet extraction using solvent mixtures selected from acetone-alcohol, acetone-methylethyl ketone.