Abstract: A method for producing a molding compound having improved surface properties is provided. The method relates to, in particular, a molding compound comprising a polycarbonate and at least one reinforcing filler, preferably selected from the group including titanium dioxide (TiO2), talc (Mg3Si4O10(OH)2), dolomite CaMg[CO3]2, kaolinite Al4[(OH)8|Si4O10] and wollastonite Ca3[Si3O9], preferably selected from the group including titanium dioxide (TiO2) and talc (Mg3Si4O10(OH)2). The total amount of reinforcing filler is 3 to 20 wt. %, preferably 4.5 to 15 wt. %, each relative to the total mass of the molding compound, the molding compound having improved properties being produced using at least one master batch produced according to the method.

Abstract: A method for producing a master batch having improved properties is provided. The method relates to, in particular, a master batch containing a polycarbonate and a reinforcing filler, preferably selected from one or more members of the group including the members titanium dioxide (TiO2), talc (Mg3Si4O10(OH)2), dolomite CaMg[CO3]2, kaolinite Al4[(OH)8|Si4O10] and wollastonite Ca3[Si3O9], preferably selected from one or more members of the group including the members titanium dioxide (TiO2) and talc (Mg3Si4O10(OH)2). The content of the reinforcing filler is 30 to 70 wt. %, preferably 35 to 65 wt. %, particularly 40 to 60 wt. %, relative to the total weight of the molding compound. A method for producing a molding compound having improved properties is also provided.

Abstract: A screw element which has an axially asymmetrical screw cross-sectional profile which has at least two construction points located within the screw cross-sectional profile is provided. The screw element is suitable for use in an extruder having two drive shafts which rotate in the same direction and at the same speed, in order to process or produce plastic masses as an extrudate. Also, an arrangement of two identical or different screw elements in an extruder having two drive shafts which rotate in the same direction and at the same speed is provided. An extruder which is equipped with two identical or different screw elements and has two drive shafts which rotate in the same direction and at the same speed is provided. Furthermore, the use of the screw element according to the invention for processing or producing plastic masses is provided.

Abstract: The invention relates to a method for producing a molding compound having improved properties. In particular, the invention relates to the production of a molding compound containing a polycarbonate and a reinforcing filler. According to the invention, said molding compound can be obtained by compounding a polycarbonate and the reinforcing filler by means of multi-shaft extruder having screw shafts arranged annularly with respect to one another. The reinforcing filler is preferably selected from one or more members of the group comprising the members titanium dioxide (TiO2), talc (Mg3Si4O10(OH)2), dolomite (CaMg[CO3]2). kaolinite (Al4[(OH)8|Si4O10]) and wollastonitc (Ca3[Si3O9]), preferably from one or more members of the group comprising the members titanium dioxide (TiO2) and talc (Mg3Si4O10(OH)2). According to the invention, tlie concentration of reinforcing filler is 3 to 50 wt % in relation to the total mass of tlie molding compound.

Abstract: The invention relates to a composition for production of a thermoplastic moulding compound, wherein the composition comprises or consists of the following constituents: A) 50-90% by weight of aromatic polycarbonate or polyestercarbonate having a relative solution viscosity of at least 1.285, measured in CH2Cl2 as solvent at 25° C. and a concentration of 0.5 g/100 ml, B) 1-10% by weight of rubber-modified graft polymer, C) 2.5-10% by weight of boron nitride, D) 4-20% by weight of talc, E) 2-20% by weight of phosphorus-containing flame retardant, F) 0-20% by weight of further additives, and to a process for producing the thermoplastic moulding compound, to the moulding compound itself, to the use of the moulding compound for production of mouldings and to the mouldings themselves.

Abstract: A process for extruding plastic compositions is provided. The process comprises providing a multi-screw extruder with screw elements and conveying, kneading, mixing, degassing or compounding the plastic compositions in the multi-screw extruder using the screw elements.

Abstract: A process for extruding plastic compositions is provided. The process comprises providing a multi-screw extruder with screw elements and conveying, kneading, mixing, degassing or compounding the plastic compositions in the multi-screw extruder using the screw elements.

Abstract: The present invention relates to polysiloxane-polycarbonate block cocondensates derived from a continuous melt transesterification process comprising polysiloxane blocks of the formula (1) and polycarbonate blocks having recurring units of the formula (2) having improved rheological properties and good mechanical properties as well as to mouldings and extrudates made from these polysiloxane-polycarbonate block cocondensates and wherein the polysiloxane-polycarbonate block cocondensate has a siloxane domain distribution (diameter of siloxane domains) from 200 nm to 1 ?m measured by atomic force microscopy and light microscopy which is in the range of 0.01%-2.5%, based on the total number of siloxane domains.

Abstract: The present invention relates to a process for preparing polysiloxane-polycarbonate block cocondensates proceeding from specific polycarbonates and hydroxyaryl-terminated polysiloxanes. More particularly, the present invention relates to the preparation of the said block cocondensates by means of a reactive extrusion.

Abstract: The invention relates to a process for extruding plastic compositions. The process in particular relates to the conveying, kneading and/or mixing of plastic compositions, in particular of polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends.

Abstract: The present invention relates to polysiloxane-polycarbonate block cocondensates comprising particular siloxane domains and having improved rheological properties and good mechanical properties as well as to mouldings and extrudates made from these polysiloxane-polycarbonate block cocondensates.

Abstract: The present invention relates to a process for preparing polysiloxane-polycarbonate block cocondensates proceeding from specific polycarbonates and hydroxyaryl-terminated polysiloxanes. More particularly, the present invention relates to the preparation of the said block cocondensates by means of a reactive extrusion.

Abstract: The present invention relates to a process for the production of carbon nanotubes, in particular those having a diameter of 3-150 nm and an aspect ratio of length:diameter (L:D)>100, by decomposition of hydrocarbons on a heterogeneous catalyst which comprises Mn, Co, preferably also molybdenum, and an inert support material, and the catalyst and the carbon nanotubes themselves and the use thereof.

Abstract: A masterbatch comprising pigment and demolding agent is provided. The demolding agent is selected from the group comprising low molecular weight polyolefin oils, low molecular weight polyolefin waxes, montan waxes and aliphatic or aromatic carboxylic acid esters of fatty acids and/or fatty alcohols, wherein the pigment content of the masterbatch is from 3 to 70 wt. %, based on the total weight of the masterbatch. The masterbatch is suitable for preparation of a polymer composition having improved pigment dispersion.

Abstract: The present invention relates to a process for the production of carbon nanotubes by decomposition of hydrocarbons on a heterogeneous catalyst in a fluidized bed reactor, wherein the reactor can be operated batchwise or continuously, and in the case of continuous operation discharge can take place with sifting or without sifting.

Abstract: Multi-layer bodies comprising: 1) a base layer comprising at least one thermoplastic; nanoscale carbon black in an amount of from 0.05 to 0.15 wt. %; a demoulding agent based on a fatty acid ester in a concentration of from 0.1 to 0.5 wt. %, 2) at least on one side of the base layer a scratch-resistant coating based on polysiloxane having a thickness of from 2 to 15 ?m, comprising at least one UV absorber, wherein the sum of the values of the above-mentioned components of the base layer is 100 wt. %.

Abstract: The invention relates to a composition containing at least one microgel, at least one carbon nanotube and at least one organic medium. Said organic medium can be cross-linked or non cross-linked.

Abstract: A novel carbon nanotube powder containing carbon nanotubes which have a roll-like structure, also novel carbon nanotubes having a roll-like structure, novel processes for the production of the carbon nanotube powders and of the carbon nanotubes, and their use as an additive or substrate for various applications are described.

Abstract: A masterbatch comprising pigment and demoulding agent is provided. The demoulding agent is selected from the group comprising low molecular weight polyolefin oils, low molecular weight polyolefin waxes, montan waxes and aliphatic or aromatic carboxylic acid esters of fatty acids and/or fatty alcohols, wherein the pigment content of the masterbatch is from 3 to 70 wt. %, based on the total weight of the masterbatch. The masterbatch is suitable for preparation of a polymer composition having improved pigment dispersion.

Abstract: A masterbatch comprising pigment and demolding agent is provided. The demolding agent is selected from the group comprising low molecular weight polyolefin oils, low molecular weight polyolefin waxes, montan waxes and aliphatic or aromatic carboxylic acid esters of fatty acids and/or fatty alcohols, wherein the pigment content of the masterbatch is from 3 to 70 wt. %, based on the total weight of the masterbatch. The masterbatch is suitable for preparation of a polymer composition having improved pigment dispersion.