Abstract: The present invention relates to a polyamide and a process for the preparation thereof, and to compositions containing it. It relates more particularly to a polyamide obtained by polymerization of diacid and diamine monomers in the presence of multifunctional and monofunctional compounds capable of forming an amide function by reaction with either an aminated function or an acid function. This polyamide can in particular be used for the preparation of compositions intended, for example, to be moulded.

Abstract: Polyamide-based thermoplastic polymer compositions that exhibit a good balance among the properties thereof, in particular their mechanical properties, and a high fluidity in the molten state; such compositions contain at least one high-fluidity polyamide and a shock modification agent having functional groups that react with the polyimide.

Abstract: The invention relates to a thermoplastic polymer composition that contains polyamide and comprises an excellent compromise of properties, in particular mechanical properties, and a high fluidity at the molten state. The invention particularly relates to a composition containing at least a high-fluidity linear polyamide and optionally fillers such as glass fibers, and to a method for making such a composition.

Abstract: Polyamide-based thermoplastic polymer compositions that exhibit a good balance among the properties thereof, in particular their mechanical properties, and a high fluidity in the molten state; such compositions contain at least one high-fluidity polyamide and a shock modification agent having functional groups that react with the polyimide.

Abstract: The invention relates to a thermoplastic polymer composition that contains polyamide and comprises an excellent compromise of properties, in particular mechanical properties, and a high fluidity at the molten state. The invention particularly relates to a composition containing at least a high-fluidity linear polyamide and optionally fillers such as glass fibres, and to a method for making such a composition.

Abstract: A polyamide, a method for manufacturing the polyamide and compositions that include the polymer are described. A high-viscosity polyamide obtained by the polymerization of diacid and diamine monomers in the presence of multifunctional and, optionally, monofunctional compounds are also described. The polyamide can be used in particular for the production of compositions intended, for example, for being molded or blown.

Abstract: Polyamide-based thermoplastic polymer compositions that exhibit a good balance among the properties thereof, in particular their mechanical properties, and a high fluidity in the molten state; such compositions contain at least one high-fluidity polyamide and a shock modification agent having functional groups that react with the polyamide.

Abstract: Modified polyamides having enhanced flowability/mechanical properties are prepared by polymerization of diacid and diamine monomers in the presence of multifunctional and monofunctional compounds capable of forming an amide function by reaction with either an aminated functional group or an acid functional group and are formulated into useful molding compositions.

Abstract: The invention concerns a thermoplastic copolyamide and composition comprising as matrix said thermoplastic copolyamide, and a method of making such thermoplastic copolyamide. More particularly it concerns a copolyamide of the statistical tree type resulting from the reaction between a plurifunctional monomer comprising at least three reactive functions to form an amide function, said functions being two different types, and bifunctional monomer conventionally used in making linear polyamides. The resulting copolyamide has a very low softness index in molten state compared to the linear polyamide and improved shock-resistant properties. The invention also concerns with methods for making these copolyamides and composition for molding, extruding or injecting parts. Said compositions comprise fillers and additives and said copolyamide as a matrix.

Abstract: The invention relates to a polyamide, a method for its manufacture and compounds containing it. It involves, specifically, a polyamide obtained through polymerization of an aminoacid or lactam such as caprolactam in the presence of a compound having at least three functions capable of generating an amide function by reacting either with an amine function or with an acid fonction. The polyamide obtained in this way has at least part of these molecular chains in a star formation, the other part being in linear form. This polymer is useful, inter alia, in the manufacture of compounds that are to be molded, since it has minimal viscosity in a melted medium while still retaining the mechanical properties of a linear polymer.

Abstract: A thermoplastic composition with improved properties for making fuel containers, e.g. for fuel oil, petrol, diesel oil or alcohol, and specifically for making fuel lines for feeding fuel to a fuel tank or engine. The thermoplastic composition includes a thermoplastic polymer matrix and at least one compound that enhances the resilience of thermoplastic compositions. Said matrix consists of a mixture of: at least one first thermoplastic copolymer produced by copolymerising .epsilon.-caprolactam with at least one monomer selected from the group which includes an amino acid having at least nine carbon atoms, or the corresponding lactam, and a mixture of hexamethylediamine and a diacid having at least nine carbon atoms, the weight ratio of the .epsilon.-caprolactam to the total amount of hexamethylenediamine and diacid being 4-9; and at least one second thermoplastic polymer or copolymer produced by polymerising monomers having at least nine carbon atoms.

Abstract: This invention relates to a biodegradable polyamide. In particular, this invention relates to a polyamide containing keto carbonyl groups set out in monomeric units along the main chain of the polymer and having structure (I), wherein n and m are equal or different whole numbers ranging from 8 to 10, preferably 8. Said polyamides are high light-sensitive to the solar U.V. radiation, so that the exposure of the products obtained by means of such polyamides to the U.V. solar radiation causes the product to be transformed into a fragile or friable material, that is biodegradable.

Abstract: There is described a procedure for preparing unsaturated or saturated .al.,.omega.-dialdehydes, wherein the monoozonide of the corresponding olefine undergoes hydrogenation in a solution and in presence of a catalyst system comprising(A) a noble metal comprising palladium or platinum and carried on a carrier comprising alumina, coal or barium sulphate, and(B) at least one compound of a heavy metal, and wherein, when a saturated dialdehyde is to be prepared, the unsaturated dialdehyde prepared as above undergoes a further catalytic hydrogenation in an organic solvent after removal of component (B) of the said system by means of a treatment with an ion-exchange resin acidified with sulphuric acid, the resin being of such quantity that the acid equivalents of the resin are at least equal to the equivalents of the heavy metal in the component (B) of said catalytic system.