Abstract: A thermoplastic molding composition suitable for the preparation of foam is disclosed. The composition comprises a thermoplastic resinous component and a foaming agent which includes A) (i) 0.01 to 4.8% alumina hydrate (aluminum hydroxide) in combination with (ii) 0.01 to 4.8% of an acidic additive or B) 0.01 to 4.8% of the reaction product of said (i) and said (ii), the percentages being relative to the weight of the composition to be foamed. The invention is based on the finding that the foaming of the composition does not lead to any significant reduction in molecular weight of the resinous component or to troublesome discoloration of the foam, even during its re-extrusion.

Abstract: Thermoplastic molding compounds of polyalkylene terephthalate, special barium sulfate, particulate graft polymers and, optionally, reinforcing materials are distinguished from known, elastomer-modified polyalkylene terephthalates, particularly polyethylene terephthalates, by improved heat resistance and toughness.

Abstract: A transparent thermoplastic molding composition containing:A) 30 to 94% of a thermoplastic polycarbonates based on 2,2-bis-(4-hydroxyphenyl)-propane, andB) 6 to 70% of a resin-like vinyl polymer which contains structural units corresponding to formula (Ia) ##STR1## in which R.sup.1 is H or CH.sub.3,R.sup.2 is C.sub.1-4 alkylene andR.sup.3 is C.sub.1-4 alkyl,is disclosed. The composition is particularly suitable for the preparation of optical storage media.

Abstract: A thermoplastic molding composition is disclosed containing a polycarbonate resin and(i) 0.1 to 10.0 percent of a polyalkylene oxide corresponding to formula (I) ##STR1## in which R represents H, C.sub.1-6 alkyl, tetrahydropyranyl or a silyl radical,R' represents H or C.sub.1-6 alkyl andx is an integer of 1 to 100, and(ii) 0.1 to 10 percent of an aromatic compound which contains at least one sulfonic acid ester substituent, said percent being relative to the weight of said polycarbonate. The composition which is resistant to the effects of gamma radiation is suitable for the preparation of sterilizable medical instruments.

Abstract: A process for the continuous production of a thermoplastic aromatic polycarbonate is disclosed. Accordingly, in a reactor system which includes a tube reactor and a tank equipped with a stirrer, there are reacted a preheated dialkali diphenolate aqueous solution with gaseous phosgene in CH.sub.2 Cl.sub.2 and/or in chlorobenzene solution containing excess phosgene, in a mixer to form a mixed emulsion. The emulsion is then transported at least partly against the force of gravity into the tube reactor to facilitate a polycondensation reaction and in which after a residence time of at least 10 seconds and without dissipation of the heat of reaction there is added a chain terminator. The heat of reaction is dissipated in said tank and aqueous sodium hydroxide and catalyst are added to complete the reaction. The process according to the invention leads to high yields of phosgene.

Abstract: Graft polymers having graft shells of copolymers of styrenes, .alpha.-methyl styrenes, acrylonitrile, C.sub.1 -C.sub.4 vinyl carboxylic acids, C.sub.1 -C.sub.8 alkyl acrylates and/or alkyl methacrylates, maleic acid derivatives, vinyl(idene) chloride and mixtures thereof on the one hand and monomers corresponding to formula I ##STR1## in which R.sup.1 =H, CH.sub.3,R.sup.2 =C.sub.1 -C.sub.8 alkylene,R.sup.3 =C.sub.1 -C.sub.4 alkylon the other hand andgraft bases of particulate diene and/or acrylate rubbers having particle diameters (d.sub.50) of from 80 to 800 nm, and thermoplastic molding compounds containing these graft polymers.

Abstract: According to the invention, a special process for isolating polycarbonate from methylene chloride at temperatures of 30.degree. to 80.degree. C. in the form of a powder with residual solvent contents below 5% by weight is started up as a continuous process by starting up in a two-component nozzle, in which CO.sub.2 -containing fluid and the polymer solution are continuously combined, with a large excess of CO.sub.2 and then allowing the polycarbonate/methylene chloride/CO.sub.2 fluid system to pass through the gel-forming range of the polycarbonate/methylene chloride/CO.sub.2 phase diagram with continuous reduction of the CO.sub.2 throughput to a ratio of CO.sub.2 to organic solution of 4:1 to 2:1. The process started up in this way has a particularly long useful life.

Abstract: A process for isolating a poly(ester)carbonate resin from its methylene chloride solution is disclosed. The process entails combining a solution which contains 5 to 30% by weight resin with carbon dioxide fluid in a two-component nozzle under pressures of 90 to 180 bar and at temperatures of 50.degree. to 75.degree. C., while maintaining in said the two-component nozzle a back-pressure of 85 to 150 bar, and introducing the resin into a separation vessel with retention of dust particles. Importantly, the relative quantities of carbon dioxide fluid and polymer solution used in the two-component nozzle are between 10 and 3 parts carbon dioxide fluid per one part of polymer solution, and the carbon dioxide fluid contains 10 to 1000 ppm methylene chloride. The process avoids blockage of said nozzle.

Abstract: Thermoplastic molding composition based on polyalkylene terephthalate, aromatic polycarbonate and, optionally, rubber-elastic polymer, which are provided with special phosphorus stabilizers, show good paintability and paint adhesion and, even after painting, show favorable low-temperature toughness and heat resistance.

Abstract: A process for isolating polymers from their solvents by addition of fluids containing carbon dioxide at temperatures of 30.degree. to 280.degree. C. and under pressures of 1 to 1,000 bar is disclosed. The process is characterized in that the concentration of the polymers in their solvents is between 5% and 80% by weight and the fluid containing carbon dioxide consists of at least 50% by weight carbon dioxide.

Abstract: A continuous process for the isolation of polycarbonates from a solution of polycarbonate in methylene chloride at temperatures of 30.degree. to 80.degree. C. is disclosed. The process which yields polycarbonate in powder form having residual solvent content of less than 5% by weight, is characterized in that it entails the following steps:a) obtaining a solution of polycarbonate in methylene chloride containing 10 to 40 percent polycarbonate, said percent being relative to the total weight of the polycarbonate solution,b) mixing into said solution under pressures of 10 to 50 bar and at temperatures of 30.degree. to 50.degree. C. a fluid containing carbon dioxide resulting in a non-gelling polycarbonate/methylene/chloride/dioxide pressurized system, in which between 10 and 12% CO.sub.2 are dissolved,c) mixing said pressurized system in a two-component nozzle with additional fluid containing carbon dioxide under a pressure of 50 to 300 bar and at temperatures of 40.degree. to 150.degree. C.

Abstract: The new polyphosphonates, which are highly branched through polyfunctional phosphorus compounds, are suitable for use as moldings, fibers or films and as flameproofing agents and stabilizers in plastics. The new highly branched polyphosphonates show high resistance to thermal ageing and ensure good processability coupled with high migration resistance at elevated in-use temperatures.

Abstract: Polymer alloys containing resin-like polymers of monomers corresponding to formula (I) ##STR1## in which R.sup.1 =H, CH.sub.3,R.sup.2 =C.sub.1-8 alkylene,R.sup.3 =C.sub.1-4 alkyl,and, optionally, other typical vinyl monomers and thermoplastic polymers or graft polymers.

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: 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: Improved polyamide molding compositions are characterized in that(a) the polyamide essentially contains the polycondensation product of adipic acid, terephthalic acid and hexamethylenediamine,(b) the molding compositions are reinforced with glass fibers and(c) a mixture of copper-, halogen- and phosphorus-containing compounds is present as stabilizer.

Abstract: Organic polymers, for example thermoplastics, thermosetting resins, elastomers or lacquers with increased electrical conductivity, characterized by a content of sulphur-containing pyropolymers which have been obtained by pyrolysis of sulphur-containing condensation products of aromatic compounds, which optionally contain hereto-cyclic rings with O, S or N as hetero-atoms and, sulphur or sulphur releasing compounds.

Abstract: The present invention relates to moulding materials, containing halogenated copolycarbonates, graft polymers based on an acrylate rubber, thermoplastic copolymers, tetrafluoroethylene polymers, metal compounds of antimony or bismuth, TiO.sub.2 and also, if appropriate, low molecular weight, organic halo compounds, stabilizers, flow agents, antistatic agents and/or mould release agents, and also a process for the preparation of these moulding materials.