Abstract: Polyamides are made from the polycondensation of monomers including from 15 to 80 mol % of 2,5-furandicarboxylic acid (FDCA), from 20 to 85 mol % of at least one aromatic dicarboxylic acid and from 50 to 100 mol % of at least one aliphatic diamine selected from those including 6 and 7 carbon atoms. A process allowing the synthesis of high molecular weight polyamides made from the above mentioned monomers is also described. Finally, compositions and articles including the same polyamides are also disclosed.

Abstract: A furan-based polyamide is prepared by the following steps: (1) preparing a furan-based oligomer of formula (1) H2N—R—(NH—CO—F—CO—NH—R)n—NH2 (1) where R is a hydrocarbon moiety and F is a furan (cyclo-C4H2O) moiety and n represents the average degree of oligomerization, and where n is within the range of 1 to 10 by reacting 2,5-furandicarboxylic acid or its derivative with a diamine at a temperature of at most 100° C.; (2) contacting the oligomer of step (1) with a bifunctional linker selected from an acid or a derivative thereof where the acid is furandicarboxylic acid or a non-aromatic dicarboxylic acid; provided that if the hydrocarbon moiety R is aromatic, then the bifunctional linker is an aromatic dicarboxylic acid or a derivative thereof, at a mole ratio of the oligomer to the difunctional linker within the range of 0.8 to 1.5 at polycondensation conditions, and (3) isolating the resulting polyamide.

Abstract: Polyamides are made from the polycondensation of monomers including from 15 to 80 mol % of 2,5-furandicarboxylic acid (FDCA), from 20 to 85 mol % of at least one aromatic dicarboxylic acid and from 50 to 100 mol % of at least one aliphatic diamine selected from those including 6 and 7 carbon atoms. A process allowing the synthesis of high molecular weight polyamides made from the above mentioned monomers is also described. Finally, compositions and articles including the same polyamides are also disclosed.

Abstract: A furan-based polyamide is prepared by the following steps: (1) preparing a furan-based oligomer of formula (1) H2N—R—(NH—CO—F—CO—NH—R)n—NH2 (1) where R is a hydrocarbon moiety and F is a furan (cyclo-C4H2O) moiety and n represents the average degree of oligomerization, and where n is within the range of 1 to 10 by reacting 2,5-furandicarboxylic acid or its derivative with a diamine at a temperature of at most 100° C.; (2) contacting the oligomer of step (1) with a bifunctional linker selected from an acid or a derivative thereof where the acid is furandicarboxylic acid or a non-aromatic dicarboxylic acid; provided that if the hydrocarbon moiety R is aromatic, then the bifunctional linker is an aromatic dicarboxylic acid or a derivative thereof, at a mole ratio of the oligomer to the difunctional linker within the range of 0.8 to 1.5 at polycondensation conditions, and (3) isolating the resulting polyamide.

Abstract: The invention relates to a randomly branched polyamide comprising at least units derived from: 1. AB monomers, 2. at least one compound I, being a carboxylic acid (Av) having a functionality v≧2 or an amine (Bw) having a functionality w≧2, 3. at least one compound II, being a carboxylic acid (Av) having a functionality v≧3 or an amine (Bw) having a functionality w≧3, compound II being a carboxylic acid if compound I is an amine or compound II being an amine if compound I is a carboxylic acid and the amounts of all units derived from carboxylic acids and amines in the polyamide satisfying conditions as mentioned in claim 1. The composition of the randomly branched polyamide is such that it cannot form a crosslinked polyamide (and thus no gels, either), in particular during the prepolymerization, the polymerization, the post-condensation, the processing and the storage of the randomly branched polyamide, and this at a variety of ambient factors, for instance at elevated temperature and pressure.

Abstract: The invention relates to a randomly branched polyamide comprising at least units derived from:

Abstract: The invention relates to an acid-dyeable polyamide fiber which can be obtained very reproducibly and unsusceptibly to faults during the production process. The fiber is characterized in that the amino end group content is less than 10 meq/kg. A very reproducible affinity for dyestuffs is obtained by copolymerization of a compound containing an acidic end group and having a basic nature. Compounds derived from melamine are particularly suitable.

Abstract: The invention relates to a star-shaped branched polyamide that has a high thermal stability and can be produced in existing production facilities for the corresponding linear polyamide. This is achieved by allowing the polyamide branches, at least three, to be formed from a multifunctional core having functional groups chosen from the group comprising amine and carboxyl groups, the amine or carboxyl groups being bound to an acyclic compound in which branching occures, if it is branched, at a carbon atom, or via an acyclic chain to a heterocyclic compound showing point symmetry.The process for the preparation is carried out under the conditions of the preparation of the corresponding linear polyamide. It proves to be possible to obtain, after shorter polymerization times, a product with mechanical properties that are comparable with those of the linear polyamide after significantly longer polymerization times.