Abstract: The present invention relates to a polymer powder which comprises polyamide, and to the use of this powder for shaping processes, and also to moldings produced from this polymer powder. The shaping processes are layer-by-layer processes which use powders, where regions of the respective layer are selectively melted via introduction of electromagnetic energy. The selectivity may be achieved, with no intention of restricting the invention thereto, be achieved via masks, application of inhibitors, of absorbers, or of susceptors, or via focusing of the energy introduced. After cooling, the regions then solidified can be removed in the form of moldings from the powder bed.

Abstract: A polyamide molding composition is condensed up in the melt by means of a masterbatch containing a compound having at least two carbonate units and also a polyetheramide in which at least 50% of the end groups are present as amino end groups, whereupon the melt mixture is discharged and solidified to give a molding composition or a molding. The product obtained has an increased amino end group content and consequently an improved hydrolysis resistance.

Abstract: A process for producing moldings with condensing-up of a polyamide molding composition whose polyamide component contains, as a result of the method of preparation, at least 5 ppm of phosphorus in the form of an acidic compound by means of a compound having at least two carbonate units, wherein a) from 0.001 to 10% by weight, based on the polyamide, of a salt of a weak acid is added to the polyamide molding composition prior to compounding or during compounding, b) a mixture of the finished composition and the compound having at least two carbonate units is prepared, c) the mixture is, if appropriate, stored and/or transported and d) the mixture is subsequently processed to produce the molding, with the condensing-up occurring only in this step, effects a significant increase in the melt stiffness combined with moderate processing pressures, which considerably simplifies, in particular, the production of hollow bodies and hollow profiles having large diameters.

Abstract: A film whose outer layer is composed of a molding composition which is in essence composed of the following components: a) from 3 to 50% by weight of a polyamide, selected from the group of PA11 and PA12, and b) from 50 to 97% by weight of a polyamide, selected from the group of PA1012 and PA1212, where the percentages are based on the entirety of components a) and b), is suitable for decoration of moldings which retain their gloss during their service time.

Abstract: The invention provides a method to produce primary diamines by catalytic conversion of diols having a linear main chain of from 4 to 31 carbon atoms into the corresponding diamines. The reaction is conducted in a liquid or supercritical phase and is catalyzed by a homogeneous ruthenium-containing complex. The primary diamines obtained may be suitable for polyamide syntheses.

Abstract: A film whose outer layer is composed of a molding composition which is in essence composed of the following components: a) from 3 to 50% by weight of a polyamide, selected from the group of PA11 and PA12, and b) from 50 to 97% by weight of a polyamide, selected from the group of PA1012 and PA1212, where the percentages are based on the entirety of components a) and b), is suitable for decoration of moldings which retain their gloss during their service time.

Abstract: The invention provides a process for preparing linear alpha,omega-dicarboxylic diesters by reacting a triglyceride containing fatty acid residues having monounsaturated or polyunsaturated carbon chains with carbon monoxide, an acid and an OH-group donor in one reaction step in the presence of a catalyst.

Abstract: A task often encountered in very recent times is the rapid provision of prototypes. Particularly suitable processes are those based on pulverulent materials and in which the desired structures are produced layer-by-layer through selective melting and solidification. The invention provides the constitution, production and use of a copolyamide powder which was produced using the following monomer units: a) laurolactam or ?-aminoundecanoic acid, and also b) dodecanedioic acid, and either c) decanediamine or dodecanediamine, in shaping processes, and also to moldings produced through a layer-by-layer process which selectively melts regions of a powder layer, using this specific powder. Once the regions previously melted layer-by-layer have been cooled and solidified, the molding can be removed from the powder bed. The moldless layer-by-layer processes for the production of components using the copolyamide powder result in simplified and more reliable conduct of the process and better recyclability.

Abstract: A process for producing moldings with condensing-up of a polyamide molding composition by means of a compound having at least two carbonate units, wherein a) a polyamide molding composition is made available, b) a mixture of the polyamide molding composition and the compound having at least two carbonate units is prepared, c) the mixture is, if appropriate, stored and/or transported and d) the mixture is subsequently processed to produce the molding, with the condensing-up occurring only in this step, and the molding is a hollow body or hollow profile having an external diameter of at least 30 mm and a wall thickness of at least 1 mm, effects a significant increase in the melt stiffness combined with moderate processing presssures, which considerably simplifies the production of these moldings.

Abstract: In a method for the introduction of an inliner into a pipe or a pipeline, where the external diameter of the inliner is greater than the internal diameter of the pipe or of the pipeline, and where the action of an external force is used to reduce the cross section of the inliner prior to the introduction, the inliner is composed of a polyamide moulding composition which comprises at least 50% by weight of polyamide which is not PA11. The recovery behavior of said polyamides is similar to that of polyethylene usually used for this purpose.

Abstract: The present invention provides precipitated polymer powders based on a polyamide of the AABB type, obtained by the reprecipitation of the polyamides by at least partial dissolution followed by continuous cooling of the solution to below the precipitation temperature. The polyamides are prepared by polycondensation of diamines with dicarboxylic acids. The precipitated polyamides obtained are used in layer-by-layer shaping processes such as selective laser sintering.

Abstract: A polyamide molding composition which can be used for production of a printable or printed item contains a) at most 90 parts by weight of a polyamide obtained from a lactam or from an amino carboxylic acid having at least 10 carbon atoms; and b) from 10 to 100 parts by weight of PA1010, wherein a total of components a) and b) is 100 parts by weight.

Abstract: The invention relates to powder, comprising composite particles comprising core particles completely or partially coated with a precipitated first polymer, where the core particles comprise a second polymer which differs from the precipitated first polymer, and where the ratio of the d50 median diameter of the composite particles to the d50 median diameter of the core particles is 1.15 or greater. The invention further relates to processes of using the powders of the present invention to making mouldings.

Abstract: Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the d50 median diameter of the core particles is from 1 to 70 ?m and wherein the core particle is an inorganic material which does not include titanium dioxide are provided. A method to prepare the particles includes dissolution of a polymer in a solvent and precipitation of the polymer in the presence of a suspension of the core particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

Abstract: A process for producing hydrolysis-resistant mouldings with geometries having large dimensions by cumulative condensation of a polyamide moulding composition, is provided. The process includes mixing a polyamide moulding composition of a polyamide having at least 50% of amino end groups with 0.1 to 5% by weight, based on the polyamide moulding composition, of an oligo- or polycarbodiimide. The mixture is subsequently processed to give the moulding, wherein cumulative condensation is obtained during the processing of the moulding.

Abstract: A multi layer film which comprises the following layers: I. an upper layer composed of a polyamide molding composition which is transparent at the selected layer thickness, and II. a lower layer composed of a polyamide molding composition which comprises the following components: a) from 70 to 99% by weight of a polyamide selected from a group of polyamides and copolyamides, as described, b) from 1 to 30% by weight of a copolymer which contains units of the following monomers: ?) from 20 to 94.5% by weight of one or more ?-olefins having from 2 to 12 carbon atoms, ?) from 5 to 79.5% by weight of one or more acrylic compounds, ?) from 0 to 50% by weight of an olefinically unsaturated epoxide, carboxylic anhydride, carboximide, oxazoline, or oxazinone, and has good printability and adhesive-bondability and transparency, and can be used, for example, as an overcoating for skis.

Abstract: A molding, produced by a layer-by-layer process in which regions of respective polymer pulverulent layers are selectively melted via introduction of electromagnetic energy, where the process employs a powder which comprises at least one homopolyamide prepared via polycondensation of diamines and dicarboxylic acids, wherein the homopolyamide has an enthalpy of fusion of at least 125 J/g and a recrystallization temperature of at least 148° C.

Abstract: The invention relates to the use of a molding composition which comprises at least 50% by weight of a copolyamide, which is composed of the following monomer combination: a) from 65 to 99 mol % of a substantially equimolar mixture composed of an unbranched aliphatic diamine having from 6 to 18 carbon atoms and of an unbranched aliphatic dicarboxylic acid having from 6 to 18 carbon atoms, ?where the mixture composed of diamine and dicarboxylic acid comprises an average of from 8 to 12 carbon atoms, b) from 1 to 35 mol % of a substantially equimolar mixture composed of a cycloaliphatic diamine having from 8 to 20 carbon atoms and of a dicarboxylic acid having from 6 to 18 carbon atoms, for production of a printable or printed item, such as a ski topcoat.

Abstract: Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the d50 median diameter of the core particles is 1 ?m or greater and the ratio of the d50 median diameter of the composite particles to the d50 median diameter of the core particles is 1.15 or greater, are provided. A method to prepare the particles includes dissolution of a polymer in a solvent and reprecipitation of the polymer in the presence of a suspension of the core particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

Abstract: Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the d50 median diameter of the core particles is from 3 to 100 ?m and wherein the glass core particle material is at least one selected from the group consisting of a solid glass bead, a hollow glass bead, a porous glass bead, and a foamed glass particle. A method to prepare the particles includes dissolution of a polymer in a solvent and precipitation of the polymer in the presence of a suspension of the core glass particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.