Abstract: A thermoplastic molding composition comprising (co)poly(ester)carbonate, and a cyclic oligoformal is disclosed. The composition that is characterized in its lowered water absorption and improved flowability is suitable for a variety of application including in particular optical data storage media.

Abstract: A laminate comprising a printed layer, a transparent thermoplastic polyurethane layer and a layer forming a substrate of a thermoplastic material is disclosed. The laminate that is characterized in that the printed layer is interposed between the layer forming a substrate and the polyurethane layer is suitable for the preparation of a variety of articles.

Abstract: A thermoplastic molding composition is disclosed. The composition that contains at least one member selected from the group consisting of aromatic polycarbonate and polyester carbonate, a rubber-modified vinyl (co)polymer, and calcium carbonate having average particle diameter of less than 100 nm is particularly suitable for making articles resistant to hydrolysis.

Abstract: A thermoplastic molding composition comprising polycarbonate and at least one (co)polyformal is disclosed. Characterized by its low water absorption the composition is particularly suitable for producing molded articles, especially optical data carriers, such as compact disks, video disks, digital versatile disks and optical data carriers that are writable and erasable once or repeatedly.

Abstract: A flame resistant thermoplastic molding composition having improved mechanical properties is disclosed. The composition contains polycarbonate, a graft polymer and a phosphorus compounds of formula (I): and a mixture of fluorinated polyolefins with polyalkyl (meth)acrylates.

Abstract: A gasket (1) having a reversibly compressible lower portion (17), and an upper portion (14) having at least one upwardly extending extension, is described. The upper portion (14) of the gasket (1) includes a first (34) and optionally a second (37) upwardly extending extension, each having an exterior surface (43, 55). The first and second extensions of the upper portion each have a vertical center line (49, 58) that resides over (or extends through) an underlying exterior longitudinal groove (73, 76) of the lower portion, such that when the gasket is compressed along its vertical center axis (23) a force (79, 82) is exerted laterally outward along (or through) the exterior surfaces of the upwardly extending extensions. The force exerted laterally outward along the exterior surface of an upwardly extending extension serves to maintain a seal (214, 217) formed by abutment of the exterior surface of the extension with a separate surface (e.g.

Abstract: A continuous process for the separation of phenol is disclosed. The process includes (a) feeding a stream of material, produced while preparing bisphenol A by reacting phenol with acetone, into a distillation column containing at least 5 theoretical separation stages, b) distilling-off the phenol as a top product and discharging from the column a bottom product containing secondary components, c) continuously introducing a portion of the bottom product into a dwell-time container operating at process parameters sufficient to cause, in the presence of an acidic catalyst, at least partial isomerization of the secondary components to form an isomerized product and d) introducing the isomerized product to the distillation column. The introducing of the bottom product is at a rate that is more than 30% of the rate of feeding of the stream at temperatures greater than 190° C. and hydrodynamic dwell time of at least 120 minutes.

Abstract: A method is described for the back-moulding of sheets (7) with thermoplastics, in particular of printed sheets to protect the decorated surface against scratching or detachment, in which a sheet (7) that is initially separated from the moulded-article wall is pressed against the moulded-article wall by the melt front (3).

Abstract: A continuous process for producing oligocarbonate is disclosed. The process entails in sequence the steps of a) reacting a dihydroxyaryl compound with a diaryl carbonate in the presence of a catalyst to obtain a melt and avoiding removal of released monohydroxyaryl compound and b) withdrawing the monohydroxyaryl compound by flash evaporation and c) heating the melt obtained under vacuum in an evaporator equipped with sump receiver and d) repeating at least once steps b) and then c) each at gradually increased temperatures and lowered pressures.

Abstract: An injection-molding machine is disclosed. The machine has an injection unit and nozzle and the injection unit includes a tubular cylinder and a screw that is capable of back and forth movements along the tubular cylinder. Means are provided to stop the movement of the screw at its end/stop position at a distance from the nozzle so as to form a gap between the screw head and nozzle. The gap has a volume of more than π 4 · D 3 and up to the volume of a shot wherein D is the dimension of a single screw stroke. The use of the machine yields molded articles that are virtually streak free.

Abstract: A polycarbonate molding having improved optical properties is disclosed. The molding features an angle of deflection &agr;&egr; (min) determined in a accordance with DIN 52305-A-AS of ≦2.0 and a refractive index D&egr; (min) determined in accordance with DIN 52305-A-AZ of ≦0.05. The molding is prepared from a molding composition that contains a branched polycarbonate having a weight average molecular weight of 25,000 to 40,000 and melt volume rate of 2 to 20 cm3/10 min (300° C.; 1.2 kg) determined in accordance with ISO 1133.

Abstract: A process for the production of aliphatic oligocarbonate diols is disclosed. The optionally catalyzed high yield process entails the multistage transesterification of aliphatic diols with dimethyl carbonate. In the process DMC-methanol mixtures that have been distilled off are recycled to the reaction solution with further conversion and depletion of the contained DMC in the same or in a following reaction batch.

Abstract: The present invention relates to polycarbonate blends containing phosphonate amine and inorganic nanoparticles, which have improved flame proofing and improved mechanical properties such as low-temperature impact strength, elongation at break, weld line strength and stress cracking resistance as well as an improved yellowness index.

Abstract: A thermoplastic molding composition characterized by its excellent flame retardance, chemical resistance and thermal stability is disclosed. The compostion that contains polycarbonate, an impact modifier and a flame retardant corresponding to in which R1, R2, R3 and R4 independently of one another denote C1-C8-alkyl, C6-C10-aryl or C7-C12-aralkyl, n is 0 or 1, q is 0, 1, 2, 3, or 4, N is 0.1 and 30, R5 and R6 independently denote C1-C4-alkyl, and Y denotes C1-C7-alkylidene, C1-C7-alkylene, C5-C12-cycloalkylene, C5-C12-cycloalkylidene, —O—, —S—, —SO—, SO2 or —CO—, is further characterized in that is contains ≦0.1% fluorine, in relation to its weight.

Abstract: A phenolic compound having a branched structure is disclosed. The compound conforms to HO—Ar1—X—Ar2—[Y—W]n  (1) wherein Ar1 and Ar2 independently denote an optionally substituted mononuclear or polynuclear aromatic moiety, X and Y independently denote a single bond or a divalent radical, W denotes an optionally substituted mononuclear or polynuclear aromatic moiety or an aliphatic or cycloaliphatic radical, and n is 1 to 5, is useful as a terminal group in polycarbonates, polyester carbonates and polyesters. Also disclosed is a process for producing such resins where the disclosed compound is a chain terminator.

Abstract: Polycarbonate substrates having low concentration of defects are disclosed. The substrates are suitable for producing molded articles characterized by low cloudiness.

Abstract: A low gloss thermoplastic composition suitable for making article having low gloss and a process for its preparation are disclosed. The composition contains (I) a resinous component that includes (a) a (co)polyalkyl (meth)acrylate rubber characterized that it contains no grafted phase, (b) a poly(vinyl aromatic-co-nitrile)-grafted (co)polyalkyl (meth)acrylate rubber, and (c) a poly(vinylaromatic-co-nitrile), and (II) a gloss-reducing agent that is the reaction product of (d) a compound having two or more maleic anhydride groups per molecule, and (e) a compound having two or more terminal primary amine groups per molecule, with the proviso that the total of the maleic anhydride groups per molecule and the terminal primary amine functional groups per molecule is greater than 4.

Abstract: A thermoplastic molding composition having improved impact strength at low temperatures is disclosed. The composition contains A) polycarbonate and/or polyester carbonate B) a graft polymer based on ethylene-&agr;-olefin rubber as graft base, C) wollastonite having carbon content greater than 0.1% relative to the weight of the wollastonite and D) at least one of triglyceride, aliphatic saturated hydrocarbon and aliphatic unsaturated hydrocarbon.

Abstract: A thermoplastic molding composition containing a (co)polymer of vinylcyclohexane and a stabilizer system is disclosed. The stabilizer system contains lactone, sterically hindered phenol and a phosphite compound. The composition that is characterized by its improved thermal stability is suitable for the preparation of molded articles, including optical data carriers.

Abstract: A process for preparing an emulsion is disclosed. The process entails mixing an aqueous mineral acid that contains phosphorous in an organic solvent, the mixing being continuous and with the degree of intensity sufficient to form a homogeneous emulsion. The emulsion prepared by the process is useful in the process of preparing polycarbonate by the interfacial process. Accordingly the washed organic polycarbonate that has been washed without the use of a phosphorous containing mineral acid solution is mixed with the novel emulsion. The resulting polycarbonate is characterized by its improved thermal stability.