Abstract: Aromatic polycarbonates having weight average molecular weight M.sub.w of at least 10,000 which contain bifunctional carbonate structural units corresponding to general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 independently represent hydrogen, C.sub.1 -C.sub.12 hdyrocarbon or halogen radicals; andR.sup.5, R.sup.6, R.sup.7, R.sup.8 and R.sup.9 independently represent hydrogen or C.sub.1 -C.sub.12 hydrocarbon radicals, one or R.sup.5 and R.sup.9 representing hydrogen and the other C.sub.1 -C.sub.12 hydrocarbon radical;in amounts of from 100 to 1 mole % based on the total amount of difunctional carbonate structural units in the polycarbonate were found to be useful for thermoplast processing of compositions which are characterized by their improved toughness and high heat deflection temperature.

Abstract: Thermoplastic molding compositions of polycarbonate, polyalkylene terephthalate, special barium sulfate and, optionally, elastomers are distinguished from known molding compositions of polycarbonate, polyalkylene terephthalate and elastomers by improved heat resistance and toughness.

Abstract: Fire-retardant polycarbonates, polyester carbonates and polyesters based on dihydroxydiphenyl cycloalkanes ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, preferably chlorine or bromine, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl, preferably phenyl and C.sub.7 -C.sub.12 aralkyl, preferably phenyl-C.sub.1 -C.sub.4 -alkyl, more especially benzyl,m is an integer of 4 to 7, preferably 4 or 5, R.sup.3 and R.sup.4 may be individually selected for each X and, independently of one another, represent hydrogen or C.sub.1 -C.sub.6 alkyl andX is carbon,with the proviso that, at at least one atom X, R.sup.3 and R.sup.4 are both alkyl,the fire-retardant finish being provided by additives and/or comonomers.

Abstract: Thermoplastic aromatic polycarbonates having average molecular weights Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4 independently of one another represent hydrogen, a C.sub.1-12 hydrocarbon, halogen,Y.sup.1, Y.sup.2, Y.sup.3 independently of one another represent hydrogen,C.sub.1-5 alkyl, a C.sub.6-12 hydrocarbon radical,at least two of the substituents Y.sup.1, Y.sup.2 and Y.sup.3 not being hydrogen and at least one of the substituents Y.sup.1, Y.sup.2 and Y.sup.3 being C.sub.1-5 alkyl,in quantities of from 100 to 1 mol-%, based on the total quantity of difunctional carbonate structural units in the polycarbonate.

Abstract: The invention relates to a new process for the production of bifunctional polyphenylene oxides bearing OH groups as functional groups at both ends of the chain.

Abstract: Mixtures containing(a) 5 to 70% by weight polycarbonate based on 2-(4-hydroxphenyl)-2-(3-hydroxphenyl)-propane and(b) 95 to 30% by weight polycarbonate based on bis-2,2-(4-hydroxy-3,5-dimethylphenyl)propane, the sum of the percentages by weight of components (a)+(b) being 100% by weight.

Abstract: The invention relates to a process for the production of crystalline, aromatic polyether ketones in lactams as solvent. The polymers produced have a high molecular weight, high thermal stability, high resistance to the effect of chemicals and good mechanical properties.

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: Thermotropic polyesters containing recurring structural units corresponding to the following formulae ##STR1## can be processed at low temperatures and may be used for the production of moldings, filaments, fibers and films.

Abstract: The invention relates to the use of thermoplastic homopolycarbonates of 3,3'-dihydroxydiphenyl ether in quantities of 3% by weight to 30% by weight for modifying filsm of other thermoplastics than the thermoplastic homopolycarbonates of 3,3'-dihydroxydiphenyl ether, to a process for modifying films of these other thermoplastics, to the films obtainable by this process and to mixtures containing the homopolycarbonates mentioned and the other thermoplastics.

Abstract: Aromatic polyesters based on diphenols and iso- and/or terephthalic acid are produced by transesterification of esters of the diphenols with the aromatic dicarboxylic acids in the melt by first reacting the aromatic dicarboxylic acids with a stoichiometric excess of the diphenol esters to form oligomers and then condensing the resulting oligomers to the aromatic polyesters with elimination and removal by distillation of diphenol ester.

Abstract: The invention relates to a process for the production of solutions of polycarbonates in organic inert solvents which is characterized in that from 2.5 ppm to 100 ppm phosphorous acid, based on the weight of the diphenol used for polycarbonate production, are added to the emulsion of the two phases obtainable by the known two-phase interfacial process and the emulsion is worked up in known manner.

Abstract: The preparation of aromatic polyesters based on diphenols and iso- and terephthalic acid is carried out by solventfree transesterification of esters of the diphenols with the aromatic dicarboxylic acids, the esters of the diphenols being initially reacted with teriphthalic acid alone and subsequently reacted with isophthalic acid after at least 80% of the terephthalic acid has undergone reaction.

Abstract: The invention relates to thermoplastic molding compositions showing improved properties, more especially improved dimensional stability and notched impact strength, particularly at low temperatures, in the form of a mixture of at least 35% by weight of a copolyamide containing polydiorganosiloxane carbonamide units and/or of a mixture of partly crystalline polyamides and (co)polyamides containing polydiorganosiloxane carbonamide units and from 1 to 65% by weight of graft products of vinyl polymers on rubbers.The invention also relates to the dimensionally stable molding compositions tough at low temperatures characterized above which additionally contain amorphous siloxane-free polyamides added in quantities of up to 64% by weight.

Abstract: This invention relates to polyarylene sulphides (PPS) produced in known manner from optionally substituted halogen benzenes and aromatic polyhalogen compounds, optionally in combination with other polymers, fillers and/or reinforcing fibres, which contain certain N-containing organic bases for reducing the elimination levels of acidic, corrosion-producing volatile constituents and for improving the flow properties thereof.

Abstract: This invention relates to a new process for the preparation of optionally branched polyarylene sulphides from optionally substituted halogen benzenes in admixture with aromatic polyhalogen compounds and alkali metal sulphides in polar solvents in the presence of thio salts.

Abstract: This invention relates to a new process for the production of optionally branched polyarylene sulphides from optionally substituted halo-benzenes in admixture with polyhalogen aromatic compounds and alkali sulphides in polar solvents in the presence of disulphide compounds.

Abstract: The invention relates to a process for the preparation of branched, thermoplastic, high-molecular weight and soluble polycarbonates having improved properties, by incorporation of 3,3-bis-(4-hydroxyaryl)-oxindoles as a branching agent. The invention further relates to the polycarbonates obtained in accordance with this process.

Abstract: A copolymer containing 0.1 to 20 mol-% of recurring structural units of the formula ##STR1## is a valuable peptising agent for the precipitation of silver halide. Sensitivity, onset of development and silver coating power are advantageously influenced.

Abstract: The sensitivity of silver halide emulsions is increased if the silver halide is precipitated in the presence of a peptization agent which consists partially or wholly of a copolymer comprising 0.1 to 20 mol% of recurring structural units of the formula ##STR1## in which X is hydrogen or alkyl having 1 to 4 carbon atoms and Y is a 8-hydroxyquinoline group attached through its 5- or 7-position.