Abstract: The new thermotropic polyesters containing recurring structural units corresponding to the following formulae ##STR1## show excellent mechanical properties and good processibility. They may be used in the usual way for the production of moldings, filaments, fibers and films.

Abstract: Dihydroxydiphenyl cycloalkanes corresponding to the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl and C.sub.7 -C.sub.12 aralkyl,m is an integer of from 4 to 7,R.sup.3 and R.sup.4, individually selectable for each X, independently of one another represent hydrogen or C.sub.1 -C.sub.6 alkylandX represents carbonwith the proviso that, at at least one atom X, both R.sup.3 and R.sup.4 are alkyl, a process for their production, their use for the production of high molecular weight polycarbonates, the polycarbonates made from dihydroxydiphenyl cycloalkane of formula (I) and films made from these polycarbonates.

Abstract: This invention relates to multilayer films composed of thermoplastic films, tough elastic polyurethane films and optionally a sealing layer and to the use of these multilayer films for the manufacture of crash pad films, i.e. as outer skin for automobile dash boards.

Abstract: The flameproofed, readily crystallizing polyethylene terephthalate molding compounds, which contain polyalkyl phosphonates and crystallization aids, may be used for the production of moldings, fibers or films.

Abstract: Polyether ketones based on diphenols corresponding to the following general formula (I): ##STR1## wherein R.sup.1 and R.sup.2, independently represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 or C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl or C.sub.7 -C.sub.12 aralkyl;m represents an integer of from 4 to 7;R.sup.3 and R.sup.4, may be selected individually for each X and independently represent hydrogen or C.sub.1 -C.sub.6 alkyl, andX represents carbon;with the proviso that, on at least one atom, X, R.sup.3 and R.sup.4 both represent alkyl;the production thereof and application as films or composite films with other plastic films as well as their utilization as permeation membranes.

Abstract: Reaction compositions of selected make-up result after curing in non-meltable polymers of high mechanical stability and low water uptake. Owing to the low birefringence of the cured products, these compositions are highly suitable for preparing carrier materials for optically and magnetically readable and/or writable data carriers.

Abstract: A pacified mass is hardened under controlled conditions to produce low tension moulded parts (4) of duroplasts, the shringkage being compensated for by the movement of a lower mould part (2) and/or an upper mould part (3) to follow the mass.

Abstract: The invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulfides from alkali sulfides and aromatic dihalogen compounds, in which the reaction is carried out in a polar solvent, such as an N-alkyl lactam, containing from 0.5 to 100 mole %, based on the moles of aromatic dihalogen compound, of a lactam.

Abstract: Flame-resistant, thermoplastic polyamide moulding materials which contain 0.01-4% by weight of polyphenylene oxides as flameproofing agent and which are prepared by mixing the components in the melt.

Abstract: This invention relates to carbon-containing moulded bodies based on thermoplastic polycarbonates and thermoplastic polyalkylene terephtalates with an addition of carbon black and graphite and to a process for the production of these moulded bodies.

Abstract: A method for manufacturing printed electrical circuits which comprise a substrate and copper foil applied thereto by hot embossing in a predetermined circuit pattern, said method comprising(a) providing a laminate which comprises the sequence of a printed circuit substrate, a heat activated adhesive layer, a copper foil and a carrier film which is electrically conductive,(b) passing an electrical current between two electrodes and through the carrier film wherein one electrode has sufficiently large film contact area whereby substantially no resistance heating results from the current density and the other electrode serves as an embossing tool and is of sufficiently small film contact area whereby sufficient resistance heating results from the current density to activate the adhesive layer to bond the copper foil to the substrate in the pattern of said other electrode, and(c) removing from the laminate the carrier film and such copper foil overlying areas where the adhesive was not heat activated thereby leav

Abstract: The invention relates to a process for the production of sulphonic acid ester group-containing polyhydroxyl compounds having an average hydroxyl functionality of from 1.5 to 4, comprising reacting(a) paraffin sulphochlorides which are obtained by sulphochlorination of paraffins containing from 10 to 18 carbon atoms or of industrial mixtures of these paraffins, with unreacted paraffins and/or with chloroparaffins, having saponifiable chlorine content, based on the total weight of component (a), of from 5 to 15% with(b) an alcohol which is at least trihydric and which contains primary and/or secondary hydroxyl groups within the molecular weight range of from 92 to 250 or with mixtures of polyhydric alcohols having a molecular weight in the range of from 62 to 250 with an average hydroxyl functionality of from 2.

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: Films from aromatic polyesters and from aromatic polyestercarbonates are excellently suitable as electrically insulating films, for example as dielectric for capacitors and as conductor track films.

Abstract: Extrusion of solutions of aromatic polyesters and aromatic polyphosphonates gives copolyphosphonates with improved notched impact strength.

Abstract: Thermoplastic polyphosphonatocarbonate prepared by polycondensing at least one aromatic dihydroxy compound with a diaryl carbonate and a phosphonic acid diaryl ester in the presence of a basic polycondensation catalyst at a temperature of from 80.degree. to 340.degree. C. and under a pressure of 600 to 0.1 mm Hg in an inert gaseous atmosphere, the molar ratio of diaryl carbonate to phosphonic diaryl ester being from 5:95 to 95:5 and the molar ratio of aromatic dihydroxy compound to the sum of diaryl carbonate and phosphonic acid diaryl ester being from 0.91:1 to 0.99:1, and following polycondensation, neutralizing said basic catalyst.

Abstract: Mixtures of aromatic polycarbonates and aromatic polyester-carbonates having a specific polycarbonate/polyester-carbonate ratio and a defined ester content in the polyester-carbonates, at least one of the polycondensates containing C.sub.8 -C.sub.9 -alkylated phenyl end groups, possess a reduced tendency to stress cracking.

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.