Abstract: The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.

Abstract: The invention relates to a process for extruding plastic compositions, in particular 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 with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries.

Abstract: A stuffing screw (2) for use in an extruder system comprises a housing (7) and at least one conveying screw (5), which is mounted in a rotatable manner within the housing (7), wherein a conveying space is formed between an inner side of the housing (7) and the conveying screw (5). The stuffing screw (2) is characterized in that at least one portion of the inner side of the housing (7) is provided with one or more depressions, in particular in the form of a groove (13).

Abstract: The invention relates to novel screw elements for multi-screw extruders with screw profiles co-rotating in pairs and being fully self-wiping in pairs, to the use of the screw elements in multi-screw extruders and to a process for extruding plastic compositions.

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 polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.

Abstract: The present invention relates to screw elements with novel, tightly intermeshing, self-cleaning, co-rotating screw profiles for multishaft screw machines with pairs of co-rotating and fully abrading screw shafts, to the use of these screw elements in multishaft screw machines and to a method of generating these screw elements.

Abstract: The present invention relates to new screw elements for multi-screw extruders with pairs of co-rotating and fully wiping screws.

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 a process for devolatilising polymer-containing media such as, in particular, polymer melts, polymer solutions and dispersions and also devolatilisation apparatuses for carrying out the abovementioned process.

Abstract: The invention relates to mixing elements having an increased number of base geometry periods per longitudinal section and an improved dispersing effect for multi-shaft screw extruders comprising screw shafts that co-rotate in pairs. The mixing elements have clearances that are configured according to the method of spatial equidistants or according to the method of longitudinal equidistants. The invention further relates to the use of the mixing elements in multi-shaft screw extruders, a corresponding screw extruder comprising the mixing elements, and a method for extruding plastic masses.

Abstract: The present invention relates to a method of making a prosthetic valve that can take a first form wherein the valve is open and a second form wherein the valve is closed, the valve comprising a leaflet assembly having at least two leaflets attached to a supporting element, the leaflets having a free margin that can move between a first position wherein the valve takes the first form and a second position wherein the valve takes the second form, the method comprising providing a single piece of fabric, made by weaving warp and fill threads into a seamless tubular woven fabric having at least one stabilized edge, and forming the fabric into a leaflet assembly having an inner layer forming the leaflets with the stabilized edge forming the free margin, and an outer layer forming the supporting element. With this method a prosthetic valve can be made from a single piece of fabric made by tubular weaving techniques, and resulting in a valve with high reliability and durability.

Abstract: The present invention relates to new screw elements for multi-screw extruders with pairs of co-rotating and fully wiping screws.

Abstract: The invention relates to mixing elements that have a larger number of basic geometric periods per section and an improved dispersing effect for multi-shaft screw extruders comprising screw shafts that co-rotate in pairs. The invention further relates to the use of the mixing elements in multi-shaft screw extruders, a corresponding screw extruder comprising the mixing elements, and a method for extruding kneadable materials.

Abstract: Bio-alloy compositions, having improved mechanical, physical and thermal comprising at least one petroleum-based polymer and at least one biopolymer. Furthermore, the present disclosure relates generally to polymer compositions comprising a bio-alloy having improved characteristics, the bio-alloy including at least one hybrid biopolymer having same molecular structure as that of a petroleum based polymer and at least one biopolymer.

Abstract: The present invention provides a method of making a prosthetic valve that can take a first form wherein the valve is open and a second form wherein the valve is closed, the valve comprising a leaflet assembly having at least one leaflet attached to a supporting element, the leaflet having a free margin that can move between a first position wherein the valve takes the first form and a second position wherein the valve takes the second form, the method comprising providing a textile structure, and forming the leaflet assembly from the textile structure, such that a selvedge of the textile structure forms the free margin of the leaflet, wherein the textile structure is made by weaving warp and fill threads into a two-layer woven fabric having two stacked and interconnected layers, the two layers having selvedges at one longitudinal edge, and wherein forming the leaflet assembly comprises connecting two lateral edges of a single piece of the fabric to make a substantially tubular structure wherein the inner laye

Abstract: The present relates to a method of making a prosthetic valve that can take a first form wherein the valve is open and a second form wherein the valve is closed, the valve comprising a leaflet, a supporting element, and a stent to which the leaflet and supporting element are attached, the leaflet having a free margin that can move between a first position wherein the valve takes the first form and a second position wherein the valve takes the second form, the method comprising:—providing a woven textile structure,—forming the leaflet and the supporting element from this textile structure, such that a selvedge of the textile structure forms the free margin of the leaflet, and—forming the valve therewith, wherein the textile structure has a single layer thickness of between 40 to 150 ?m and comprises yarn comprising polymeric filaments, the yarn having a linear density of less than 120 dtex and an elongation at break of 10% or less, and wherein the leaflet is attached to the stent by making stitches through at l

Abstract: The invention relates to a prosthetic valve comprising a leaflet assembly having at least one leaflet (3) attached to a supporting element (2), which leaflet has a free margin that can move between a first position wherein the free margin is flexed away from a closure surface (700) to allow body fluid to flow through the valve, and a second position wherein the free margin abuts the closure surface to close the valve, and wherein the leaflet, without pulsatile load on the valve, can form a coaptation height H of more than 0.1 mm along the length of the free margin. Such prosthetic valve provides good performance during prolonged time, and can be made using various materials for the leaflets. The invention also relates to a leaflet assembly for use in a prosthetic valve, and to methods of making the prosthetic valve, including making the leaflet assembly.

Abstract: The present invention relates to a process for devolatilising polymer-containing media such as, in particular, polymer melts, polymer solutions and dispersions and also devolatilisation apparatuses for carrying out the abovementioned process.

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.