Abstract: Copolymers of blocks of polymers of cyclic aliphatic carbonates, cyclic aliphatic esters or cyclic aliphatic carbonates and cyclic aliphatic esters on the one hand and blocks of polymers of cyclic aromatic carbonates on the other hand and a process for their production by multistage polymerization, in which a block polymer is initially prepared from the aliphatic monomer and the aromatic polymer is produced in the presence of this block.

Abstract: Polydiorganosiloxane-polycarbonate block copolymers based on dihydrodiphenylcycloalkanes corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2 independently of one another represent hydrogen, halogen, preferably chlorine or bromine, C.sub.1-8 alkyl, C.sub.5-6 cycloalkyl, C.sub.6-10 aryl and C.sub.7-12 aralkyl, preferably phenyl-C.sub.1-4 -alkyl, more especially benzyl,n=2 or 3 andthe substituents R.sup.5 independently of one another are hydrogen or C.sub.1-12 alkyl, with the proviso that at least one of the substituents R.sup.5 is not hydrogen,having an average molecular weight M.sub.w (weight average) in the range from 10,000 to 300,000 (as measured by ultracentrifugation or scattered light measurement) and a content of carbonate containing dihydroxydiphenylcycloalkanes of formula I and, optionally, other diphenols in co-condensed form of from 75% by weight of 99.

Abstract: Polyesters and polyester-carbonates based on dihydroxydiphenylcycloalkanes corresponding to the following general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen, a C.sub.1 -C.sub.12 hydrocarbon radical or halogen; m represents an integer of from 4 to 7,R.sup.5, and R.sup.6, 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.5 and R.sup.6 simultaneously represent alkyl.

Abstract: Thermoplastic blends ofA) 1 to 99% by weight of at least one thermoplastic aromatic polycarbonate which contains difunctional carbonate structural units of the formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another are hydrogen, a C.sub.1 -C.sub.12 -hydrocarbon radical or halogen and R.sup.5, R.sup.6 and R.sup.7 independently of one another are H or a hydrocarbon radical, with the proviso that at least one of the radicals R.sup.5, R.sup.6 and R.sup.7 is a hydrocarbon radical, that when only one of the radicals R.sup.5, R.sup.6 or R.sup.7 is present as a hydrocarbon radical this is a C.sub.3 -C.sub.12 -hydrocarbon radical with the exception of C.sub.3 -C.sub.12 -n-alkyl, and that when two or three radicals R.sup.5, R.sup.6 and R.sup.7 are present as hydrocarbon radicals these are any C.sub.1 -C.sub.

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: Polyester-carbonate/polysiloxane block copolymers containing the following recurring structural units: ##STR1## wherein the structural units (1) comprise at least 75 wt.% of the sum of the structural units (1) and (2), exhibit better low temperature tough fracture properties than the known polyester-carbonate/polysiloxane block copolymers containing comparable recurring structural units on comparison of polyester-carbonate/polysiloxane block copolymers of the same heat resistance.

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: Thermoplastic aromatic polycarbonates having average molecular weights Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 hydrocarbon radical, halogen andR.sup.5, R.sup.6 and R.sup.7 represent hydrogen, iso-C.sub.3 -C.sub.5 -alkyl,one of the substituents R.sup.5, R.sup.6 or R.sup.7 not being hydrogen, in quantities of from 100 to 1 mol-%, based on the total quantity of difunctional carbonate structural units in the polycarbonate.

Abstract: Thermoplastic aromatic polycarbonates having average molecular weight Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 -hydrocarbon, halogen,m is 2 or 3 andX represents hydrogen or a C.sub.6 -C.sub.12 hydrocarbon, at least one substituent X being a C.sub.6 -C.sub.12 hydrocarbon radical,in quantities of from 100 to 1 mol-% based on the total quantity of difunctional carbonate structural units in the polycarbonate.

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: This invention relates to a process for the production of aromatic polycarbonates from cyclic aromatic carbonate oligomers in the presence of aprotic organic solvents at low temperatures.

Abstract: This invention relates to halogen-free binary mixtures of two fully aromatic polycarbonates each having a disperse solubility of from 18 to 35 (J/ccm).sup.1/2, in which both polycarbonates are of high molecular weight and each contains not more than 70 mol-% of bisphenol A. The invention further relates to the use of these mixtures for optical data stores and to moulded parts produced from the mixtures.

Abstract: Aromatic polyesters are prepared by the transesterification of aromatic dicarboxylic acid dialkyl esters with diester derivatives of divalent phenols at temperatures of about 260.degree. to 350.degree. C. with removal of the resulting monocarboxylic acid alkyl ester from the reaction mixture.

Abstract: The present invention relates to the use of polysiloxanes containing amino groups as additives for improving levelling and wetting of polyurethane-based coating compositions applied to plastic substrates. The present invention additionally relates to the coated plastic substrates.

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: 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: An electrophotographic recording material which comprises an electrically conductive support having thereon a double layer of a charge generating layer in contiguous relationship with a charge transporting layer comprising a positive charge transporting compound corresponding to the following general formula (I): ##STR1## wherein: R represents hydrogen or an aliphatic or cycloaliphatic group including these groups substituted by non-ionic substituents,each of R.sup.1 and R.sup.2 (same or different) represents a C.sub.1 -C.sub.6 alkyl group or an aryl group, andZ represents the atoms necessary to close an adjacent aromatic nucleus or aromatic ring system including such nucleus or ring system substituted with one or more substituents of non-ionic character.

Abstract: This invention relates to mixtures of thermoplastic aromatic poly(ester)carbonates with thermoplastic polyurethanes containing special graft polymers and, optionally, suitable additives, to a process for their production and to the use of the mixtures according to the invention for the production of moldings, particularly by injection molding or extrusion.