Abstract: The present invention relates to a novel polyamide synthesized from biosourced monomers. The novel polyamide comprises the repeating unit of formula I below: in which A represents a covalent bond or a divalent hydrocarbon-based group chosen from saturated or unsaturated aliphatics, saturated or unsaturated cycloaliphatics, aromatics comprising at least 5 carbon atoms, arylaliphatics and alkylaromatics; X represents a divalent group of formula II or III below: The present invention also relates to the process for preparing the said polyamide, to its uses, and to articles and compositions comprising the said polyamide.

Abstract: The present invention relates to a novel polyamide synthesized from biobased monomers. The novel polyamide comprises the repeating unit of formula (I) below: Formula (I), in which R represents a covalent bond or a divalent hydrocarbon-based chosen from saturated or unsaturated aliphatics, saturated or unsaturated cycloaliphatics, aromatics, arylaliphatics and alkylaromatics. The present invention also relates to the process for preparing the said polyamide, to its uses, and to articles and compositions comprising the polyamide.

Abstract: A polyamide composition is described that is stabilized with respect to heat. The composition can have a polyhydric alcohol-based stabilization system that is excellent in maintaining mechanical properties after exposure to heat. Also described, is a process for producing these compositions, and the use of these compositions for making various articles.

Abstract: A polyamide composition for surface-mounted components is described. Also described are compositions for surface-mounted components (SMCs) including a semiaromatic polyamide modified by a hydroxyaromatic compound, reinforcing fillers, and a flame retardant. Further, the compositions have many advantages linked to the uses thereof in lead-free reflow soldering processes, in particular a good dimensional stability and a blistering resistance during the use of articles produced from these compositions.

Abstract: Supramolecular polymers having repeat units connected by hydrogen bonds, where the repeat units are monomers, macromers, oligomers or polymers where at least one on the monomers contains at least one 2,5-diketopiperazine group are described. Composition prepared from these supramolecular polymers and articles produced from these compositions are also described.

Abstract: The present invention relates to semiaromatic semicrystalline thermoplastic copolyimides obtained by polymerization of at least: (a) an aromatic compound comprising two anhydride functions and/or carboxylic acid and/or ester derivatives thereof; (b) a diamine of formula (I) NH2-R—NH2 in which R is a divalent aliphatic hydrocarbon-based radical optionally comprising heteroatoms, the two amine functions being separated by a number X of carbon atoms, X being between 4 and 12; and (c) a diamine of formula (II) NH2-R?—NH2 in which R? is a divalent aliphatic hydrocarbon-based radical optionally comprising heteroatoms, the two amine functions being separated by a number Y of carbon atoms, Y being between 10 and 20; it being understood that diamine (b) is different from diamine (c).

Abstract: A polyamide modified by a compound including a sulfonate group, as well as a method for preparing the polyamide and to articles obtained from said modified polyamide are described. A modified polyamide obtained from a mono-functional aromatic sulfonate compound is also described.

Abstract: The present invention relates to semiaromatic and semicrystalline thermoplastic polyimides obtained by polymerization of at least one aromatic compound comprising two anhydride functions and/or carboxylic acid and/or ester derivatives thereof and a diamine comprising between 13 and 22 carbon atoms. These polyimides may be converted into plastic articles by various methods, such as injection-molding.

Abstract: The invention relates to navel thermoplastic (co)polyimides and to the methods of synthesis thereof. The invention specifically relates to semi-aromatic thermoplastic (co)polyimides obtained by polymerisation of at least one aromatic compound comprising two anhydride functions and/or the derivatives thereof, especially carboxylic acid and/or ester, and at least one diamine of formula (I) NH2—R—NH2 wherein R is a saturated aliphatic hydrocarbonated divalent radical, the two amine functions thereof being separated by 4 to 6 carbon atoms, and 1 or 2 hydrogen atoms of the divalent radical being substituted by 1 or 2 methyl and/or ethyl groups. Said (co)polyimides can be transformed into plastic items by various methods such as extrusion, moulding or blowing.

Abstract: The invention relates to a polyamide that is stabilized toward heat, light and/or bad weather by using a compound comprising at least one amine function and at least two aliphatic hydroxyl functions. The stabilizing compound may also be added to the polyamide to form stabilized polyamide compositions.

Abstract: The present invention relates to thermoplastic polyimides and to the synthesis thereof. The invention relates in particular to a method for manufacturing semi-aromatic thermoplastic polyimides by means of the solid-state polymerization of a solid ammonium carboxylate salt formed from an aliphatic diamine and an aromatic tetracarboxylic acid, thereby enabling powders having controlled particle sizes to be produced.

Abstract: The present invention relates to the use of a polyhydric alcohol in a polyamide polymerization process for giving the modified polyamide obtained increased stability toward heat, light and/or bad weather. The invention also relates to a polyamide modified in this way, and also to polyamide compositions that may be used for the preparation of specific articles liable to be subjected to high temperatures.

Abstract: The present invention relates to a novel polyamide synthesized from biosourced monomers. The novel polyamide comprises the repeating unit of formula I below: in which A represents a covalent bond or a divalent hydrocarbon-based group chosen from saturated or unsaturated aliphatics, saturated or unsaturated cycloaliphatics, aromatics comprising at least 5 carbon atoms, arylaliphatics and alkylaromatics; X represents a divalent group of formula II or III below: The present invention also relates to the process for preparing the said polyamide, to its uses, and to articles and compositions comprising the said polyamide.

Abstract: A polyamide modified by a compound including at least one hydroxyl group, as well as a method for preparing said polyamide and articles obtained from the modified polyamide are described. A polyamide composition including reinforcing fillers, and a modified polyamide obtained by polymerization from, in particular, a monofunctional hydroxyaromatic acid or amino acid compound in the presence of diacid, diamine and/or amino acid or lactam compounds are also described.

Abstract: A polyamide-polyolefin block copolymer having a polyamide backbone and one or two polyolefin graft(s) on the backbone is described. Further described, is how the polyolefin graft(s) is (are) attached to the backbone via the residues of a function X-Y resulting from the reaction of a function X located at the polyolefin chain end and capable of reacting with an amine or carboxylic acid function Y of the polyamide.

Abstract: A polyamide composition is described that is stabilized with respect to heat. The composition can have a polyhydric alcohol-based stabilization system that is excellent in maintaining mechanical properties after exposure to heat. Also described, is a process for producing these compositions, and the use of these compositions for making various articles.

Abstract: A polyamide composition for surface-mounted components is described. Also described are compositions for surface-mounted components (SMCs) including a semiaromatic polyamide modified by a hydroxyaromatic compound, reinforcing fillers, and a flame retardant. Further, the compositions have many advantages linked to the uses thereof in lead-free reflow soldering processes, in particular a good dimensional stability and a blistering resistance during the use of articles produced from these compositions.

Abstract: The use of a polyamide modified by sulfonate functions which has improved barrier properties is described. Further described is the use of a sulfonate, aliphatic or aromatic compound for manufacturing a modified polyamide having improved fluid-barrier properties. The composition as described includes a modified polyamide, which is optionally a composition in the form of granules or powder used in manufacturing articles by an injection or extrusion blow-molding method.

Abstract: The use of a polyamide modified by hydroxyl aromatic compounds used to impregnate reinforcement materials assuming the form of industrial fabric cloth for manufacturing composite materials is described. Also described, is a composite material produced and a method by which the composite material is produced. Further, the method by which the composite material is produced can include: a) impregnating a reinforcing cloth with a polyamide composition in a molten state, the polyamide including hydroxy aromatic units which are chemically linked to the polyamide chain; the composition including a novolac resin; and b) cooling and then recovering the composite article.

Abstract: A method for manufacturing a composite article is described that includes a step of impregnating a reinforcing fabric with a semi-aromatic polyester composition in the molten state, having a melt viscosity ? of 20 Pa·s to 200 Pa·s. The reinforcing fabric can be maintained at a temperature of plus or minus 50° C. relative to the melting temperature of the polyester.