Abstract: The use of at least one MXDZ polyamide, obtained from the polycondensation of meta-xylylenediamine (MXD), with a C6 to C18 aliphatic (Z) dicarboxylic acid, in particular C6 to C12, in a mixture including at least one aliphatic polyamide A obtained from the polycondensation of a unit selected from: a C6 to C12 lactam, a C6 to C12amino acid, and an XY unit obtained from the polycondensation of a C4 to C18, aliphatic diamine (X), especially C4 to C12, and a C6 to C18 aliphatic dicarboxylic acid (Y), especially C6 to C12, circular-section glass fibres and optionally at least one impact modifier and/or at least one additive, said at least one MXDZ polyamide and said mixture constituting a composition, and the MXDZ/A weight ratio being from 0.11 to 0.83, in particular from 0.11 to 0.66, to limit the warping of said composition during processing, in particular by injection or compression moulding.

Abstract: The use of circular-section glass fibres in a mixture including at least one MXDZ polyamide, obtained from polycondensation of meta-xylylenediamine (MXD), with a C6 to C18 aliphatic (Z) dicarboxylic acid, and at least one aliphatic polyamide A obtained from the polycondensation of a unit selected from: a C6 to C12 lactam, a C6 to C12 amino acid, and an XY unit obtained from the polycondensation of a C4 to C18 aliphatic diamine (X), and a C6 to C18 aliphatic dicarboxylic acid (Y), circular-section glass fibres and optionally at least one impact modifier and/or at least one additive, said circular-section glass fibres and said mixture constituting a composition, said circular-section glass fibres being present from 30 to 75% by weight and with respect to the total weight of the composition, to improve the mechanical properties of said composition, including elongation at break, after processing, in particular by injection or compression moulding.

Abstract: One subject of the present invention is a composition that combines at least one polyamide having at least one MXD entity, MXD denoting meta-xylylenediamine or a mixture of meta-xylylenediamine and of para-xylylenediamine, with a bioresourced reinforcement. The invention also relates to the conversion of these compositions, by injection molding or extrusion, into objects that have good mechanical properties, said objects corresponding to technical application specifications such as may be found, for example, in the automotive industry, construction, sport and in electrical or electronic fields.

Abstract: A composition based on poly(ether ether ketone) (PEEK) including poly(ether ketone ketone) (PEKK), wherein the poly(ether ketone ketone) (PEKK) includes a mixture of terephthalic and isophthalic units, the percentage by weight of terephthalic units, with respect to the sum of the terephthalic and isophthalic units, being between 55 and 85%, limits included, and preferably between 55 and 70%, the composition including between 1 and 40%, limits included, preferably between 5 and 40% and more preferably still between 10 and 30% by weight of PEKK, with respect to the total weight of the composition.

Abstract: A method for producing an object by melting a polymer powder in a powder sintering device. For example, a method for producing an object by melting a polymer powder in a powder sintering device under a laser beam, implementing a rheological analysis of the polymers, in order to determine the conditions for producing the object by melting polymer powders.

Abstract: Provided is a method for heating or cooling a liquid or a body by means of a vapor compression circuit containing a heat transfer fluid. The vapor compression circuit element includes at least one layer that includes copolyamide of formula X/10.T/Y, where the structural variables are described herein.

Abstract: Provided is a poly(aryl-ether-ketone) (PAEK) powder suitable for use in a method for building objects layer-by-layer by electromagnetic radiation-generated sintering, which is obtained from a thermal pretreatment at a temperature between 260° C. and 290° C. and which has a melting temperature which is stable, at the build temperature, and below or equal to 330° C.

Abstract: A powder composition of polyarylene ether ketone ketones allowing an excellent castability/coalescence balance suitable for laser sintering. A composition including between 99.6 and 99.99% by weight of at least one powder of at least one polyarylene ether ketone and 0.01 to 0.4% by weight of a hydrophilic flow agent. This hydrophilic flow agent is characterized by an increase in mass (quantity of water absorbed) of more than 0.5% after 5 days of conditioning at a relative humidity of 95%. This increase in mass of the flow agent is determined by means of a Karl Fischer measurement after desorption of the water by a 5-minute treatment at 170° C. This composition is suitable for laser sintering. In particular, it gives the powder an excellent castability/coalescence balance.

Abstract: A method of constructing a model of permeation to mixtures of solvents of a multilayer polymer structure with n monolayers and its associated computer program. For example, selecting several initial compositions of solvent mixture E1 to Ey, carrying out a sorption measurement and a measurement of diffusion, discretizing said multilayer structure in space and time, estimating partial fluxes of each of the compounds of said composition of solvent mixture between each elementary slice of said multilayer structure, estimating on the one hand a maximal sorption ceiling of said downstream monolayer B and on the other hand the composition of solvent mixture at inlet of said downstream monolayer B, performing a mass balance from slice to slice as a function of time, adjusting the profile of concentrations, storing the concentration profiles and the partial fluxes obtained.

Abstract: A tubular structure for transporting heat transfer fluid including at least: i) a layer (1) in contact with the fluid including at least one thermoplastic polymer P1 that is semicrystalline with Tm1 greater than or equal to 160° C., as determined according to the standard 1 1357-3 (2013) or amorphous with Tg1 greater than or equal to 100° C., as determined according to the standard 1 1357-2 (2013), said layer (1) containing no fibers, ii) a layer (2) including at least: (a) a thermoplastic polymer P2 that is semicrystalline, in particular a polyamide with Tm2 greater than or equal to 170° C. or amorphous with Tg2 greater than or equal to 100° C., or a polyolefin with Tm greater than 100° C.; (b) continuous fibers, the polymer P2 being identical to P1 or different from P1 in which case the polymers P1 and P2 adhere at least partially to one another.

Abstract: A composition based on poly(ether ether ketone) (PEEK) including poly(ether ketone ketone) (PEKK), characterized in that the poly(ether ketone ketone) (PEKK) includes a mixture of terephthalic and isophthalic units, the percentage by weight of terephthalic units, with respect to the sum of the terephthalic and isophthalic units, being between 55 and 85%, limits included, and preferably between 55 and 70%, the composition including between 1 and 40%, limits included, preferably between 5 and 40% and more preferably still between 10 and 30% by weight of PEKK, with respect to the total weight of the composition.

Abstract: The invention relates to a composition comprising at least one first polyamide, conforming to the formula MXD.10 or MXD.10/Z and having a melting temperature Tf1, and at least one second polyamide. Said at least second polyamide has a melting temperature Tf2 such that Tf1?40° C.?Tf2<Tf1+20° C. The invention likewise relates to an article obtained from such a composition, to a method of shaping such an article, and to the use of such a composition and of such an article.

Abstract: The application relates to a composition having improved dimensional stability and comprising an amorphous polyamide or a mixture of amorphous polyamides, and a semi-crystalline polyamide for which the average number of carbon atoms (C) relatively to the nitrogen atom (N) is greater than or equal to 8 or a mixture of semi-crystalline polyamides wherein the average number of carbon atoms (C) relatively to the nitrogen atom (N) of each of the semi-crystalline polyamides is greater than or equal to 8, to its preparation method and to its uses.

Abstract: The invention relates to a thermoplastic structure comprising at least one layer consisting of a composition comprising a copolyamide of formula X/10.T/Y, wherein: X represents either the residues of an aliphatic amino acid comprising between 8 and 18 carbon atoms, or a lactam, or the unit X1.X2 representing the residues resulting from the condensation of an aliphatic diamine comprising between 6 and 18 carbon atoms and a (cyclo)aliphatic diacid comprising between 6 and 18 carbon atoms; 10.T represents the residues resulting from the condensation of a decanediamine and terephthalic acid; and Y represents the residues resulting from the condensation of an aliphatic diamine comprising between 9 and 14 carbon atoms and an aromatic diacid, Y being different from the unit 10.T; the molar proportion of 10.T units in the copolyamide being higher than 0%; the molar proportion of Y units in relation to the group of 10.T and Y units being between 0 and 30%; and the proportion of X units being between 0.4 and 0.

Abstract: The invention relates to a process for the heat treatment of poly(arylene ether ketone ketone) powder suitable for laser sintering, and also to the powders resulting from this process.

Abstract: The present invention relates to a composition comprising at least one poly(arylene ether ketone) powder suitable for laser sintering and also to the process which makes it possible to obtain it, minimizing the amount by weight of remaining non-sintered powder after production of the part by sintering.

Abstract: The invention concerns a composition comprising a first polyamide, a second polyamide, different from the first polyamide, and 0.1 to 5% by weight of carbonaceous nanofillers, in which: a) the first polyamide comprises a unit derived from the condensation of meta-xylylene diamine or from a mixture of meta-xylylene diamine and para-xylylene diamine with sebacic acid, said first polyamide having a melting temperature Tf1; and b) the second polyamide has a melting temperature Tf2 higher than or equal to Tf1?40° C. The invention also relates to a method for producing said composition and the use thereof for producing various items.

Abstract: The invention relates to a composition comprising at least one first polyamide, conforming to the formula MXD.10 or MXD.10/Z and having a melting temperature Tf1, and at least one second polyamide. Said at least second polyamide has a melting temperature Tf2 such that Tf1?40° C.?Tf2<Tf1+20° C. The invention likewise relates to an article obtained from such a composition, to a method of shaping such an article, and to the use of such a composition and of such an article.

Abstract: A method for producing an object by melting a polymer powder in a powder sintering device. For example, a method for producing an object by melting a polymer powder in a powder sintering device under a laser beam, implementing a rheological analysis of the polymers, in order to determine the conditions for producing the object by melting polymer powders.

Abstract: A composition based on poly(ether ether ketone) (PEEK) including poly(ether ketone ketone) (PEKK), characterized in that the poly(ether ketone ketone) (PEKK) includes a mixture of terephthalic and isophthalic units, the percentage by weight of terephthalic units, with respect to the sum of the terephthalic and isophthalic units, being between 55 and 85%, limits included, and preferably between 55 and 70%, the composition including between 1 and 40%, limits included, preferably between 5 and 40% and more preferably still between 10 and 30% by weight of PEKK, with respect to the total weight of the composition.