Abstract: The invention relates to aromatic polyether sulfones having new structural features, to a process for their production and to their use.

Abstract: This invention relates to a new thermally stable polyphenylene oxide (PPO) and to its use as thermoplastic material.

Abstract: Certain fluoromethylphenols, such as 3,5-bis-trifluoromethylphenol, are suitable solvents for LC-polymers. Many LC-polymers which have hitherto been regarded as insoluble in organic solvents can be brought into solution by means of these compounds. The polymers thereby become more easily analyzable and can be processed from solution.

Abstract: The invention relates to a process for the production of high molecular weight, crystalline, aromatic polyether ketones showing high temperature stability, high resistance to the effect of chemicals and good mechanical properties.

Abstract: Thermotropic polyester imides having recurrent units corresponding to the following formulae: ##STR1## have excellent dimensional stability under heat and are suitable for the production of moulded articles, filaments, fibres and films.

Abstract: Thermotropic polyester imides having recurrent structural units corresponding to the following formulae: ##STR1##

Abstract: Moldings of mixtures of an aromatic polycarbonate and a thermotropic polymer show a reduced tendency towards delamination when they contain a fluorinated polyolefin and an elastomeric graft polymer.

Abstract: By processing fibres and filaments of thermotropic polymers from anisotropic melt, films and mouldings having predeterminable properties are formed.

Abstract: Thermotropic, fully aromatic polyesters based on p-hydroxybenzoic acid, 4,4'-dihydroxydiphenyl, terephthalic acid and isophthalic acid have exceptionally high dimensional stability under heat. The thermotropic aromatic polyesters are used for the production of moulded articles, filaments, fibres and films.

Abstract: Thermotropic polyesterimides based on N-(.omega.-carboxyalkylene)-trimellitic acid imides and diphenols are distinguished by superior mechanical properties while at the same time being easily processible.

Abstract: Thermotropic, fully aromatic polyesters based on p-hydroxybenzoic acid, aromatic dicarboxylic acid and diphenol in which the dicarboxylic acid groups consist at least in part of 3,3'-diphenyldicarboxylic acid groups have excellent mechanical properties, in particular excellent elongation at break.

Abstract: Thermotropic, fully-aromatic polyesters having a high content of 3,4'-benzophenonedicarboxylic acid radicals exhibit a combination, hitherto unknown, of good processability, high deflection temperature under load and very high strength and stiffness.

Abstract: Thermotropic aromatic polyesters which contain condensed radicals of bis-.alpha., .omega.-(4-hydroxyphenyl)-n-alkanes, have high dimensional stability under heat and at the same time high thermal stability. They can be processed thermoplastically at temperatures below 370.degree. C.

Abstract: The present invention relates to bis-quinoxalines of the formula I ##STR1## their preparation, their use as branching agents for the preparation of branched, thermoplastic polycarbonates and the branched thermoplastic polycarbonates.

Abstract: Thermotropic, fully aromatic polyesters of p-hydroxybenzoic acid, 3,4'-benzophenone-dicarboxylic acid and certain bisphenols have a previously unknown combination of very high rigidity and high toughness.

Abstract: The invention relates to new aromatic polyesters based on terephthalic acid and hydroquinones, processes for their preparation from hydroquinone and terephthalic acid derivatives, and their use for the preparation of molecularly reinforced polymers.

Abstract: The present invention relates to bis-quinoxalines of the formula I ##STR1## their preparation, their use as branching agents for the preparation of branched, thermoplastic polycarbonates and the branched thermoplastic polycarbonates.

Abstract: Bis-hydroxyphenyl-n-alkanes are prepared by contacting dicarboxylic acids or dicarboxylic acid derivatives with fluorine-containing organic sulphonic acids, where appropriate with the addition of a phenolic compound, and converting the alkanediones, which are thus obtainable, into bis-hydroxyphenyl-n-alkanes by hydrogenation and, where appropriate, an additional ether cleavage. The invention also relates to new bis-hydroxyphenyl-n-alkanes and to new alkanediones.

Abstract: Thermotropic aromatic polyesters which contain 3,3'-diphenyl-4,4'-dihydroxydiphenyl radicals as diphenol radicals can be processed by thermoplastic methods without decomposition, in spite of the high heat distortion resistance.

Abstract: The processing by shaping, in particular includes here the moulding, spinning, extrusion, compression and injection moulding of polymers. An electric field thereby influences the flowing polymer melt before and/or during and/or after shaping. The temperature of the melt is maintained at a value between the glass temperature and the isotropic point. Thermotropic liquid-crystalline polymers are used as starting product. Among these are, in principle, all polymers which have mesogenic groups in the main and/or side chain and which can be processed from the liquid-crystalline melt phase. The orientation distribution and thus also the mechanical properties of the end product can be purposefully regulated by the electric field.