摘要:
The present invention relates to a process for preparing a polyamide, a polyamide material obtainable by the said process, a nylon salt to be used therein, and a process for making the nylon salt. The process for preparing the polyamide is a direct solid state polymerization process. The salt used herein is a granulate material, prepared by a process, comprising spraying an aqueous solution comprising a diamine and a dicarboxylic acid dissolved in an aqueous medium, or an aqueous slurry comprising a diammonium dicarboxylate salt dispersed in an aqueous medium directly obtained from such an aqueous solution, onto or in a fluidized bed of diammonium dicarboxylate salt particles, while evaporating the aqueous medium, thereby forming a granulate salt material.
摘要:
The invention relates to process for the production of a PA-MXDT/ZT polyamide comprising the following steps: (i) providing a solid MXDT/ZT salt, wherein MXD is meta-xylylenediamine, T is terephthalic acid, Z is a linear aliphatic diamine having from 2 to 12 carbon atoms and wherein the amount of Z is from 0to40 mole %with respect to the total of the amount of MXD and Z units in the polymer, (ii) solid state polymerizing the MXDT/ZT salt to obtain the polyamide, wherein the solid state polymerizationis carried out at least partly under a diamine atmosphere. The invention further relates to a PA-MXDT/ZT polyamide, wherein the polymer has a glass transition temperature fulfilling the following relation: Tg > 226 –475*Y, wherein Y is the weight ratio g/g of all CH 2 groups in the polymer with respect to the total weight of the polyamide.
摘要:
Polyamide terpolymer compositions, which contain biobased monomers and are suitable for making shaped articles, are disclosed. Comprised of three monomeric species polymerized randomly, including hexamethylene diamine, adipic acid and a bio-based monomer, the compositions are easier to process and have better dye uniformity than polyamides formed from melt-blended biobased components, and are comparable in dyeability, color fastnessand appearance retention performance to non-biobased polyamide copolymers.
摘要:
The invention relates to a polyamide modified by a compound containing at least one hydroxyl group, as well as to a method for preparing said polyamide and to articles obtained from the modified polyamide. The invention more particularly relates to a polyamide composition containing reinforcing fillers, and to a modified polyamide obtained by polymerisation from, in particular, a monofunctional hydroxyaromatic acid or amino acid compound in the presence of diacid, diamine and/or amino acid or lactam compounds.
摘要:
Die Erfindung bezieht sich auf ein Verfahren zur Kristallisation eines zumindest teilweise amorphen, thermoplastischen polymeren Materials, das durch Verfestigen aus einer Polymerschmelze gewonnen wurde, dadurch gekennzeichnet, dass das polymere Material vor dem Schritt der Kristallisation einem oder mehreren Konditionierungsschritten unterzogen wird, in denen ein kontrollierter Feuchtigkeitsgehalt und/oder ein kontrolliertes Feuchtigkeitsprofil in dem Material eingestellt wird bzw. indem das Verfestigen aus der Polymerschmelze derart erfolgt, dass das polymere Material vor dem Schritt der Kristallisation ein definiertes Anfangs-Feuchtigkeitsprofil aufweist.
摘要:
The invention relates to a process for obtaining a polyamide product from the smelt, the polyamide consisting essentially of units derived from an aliphatic dicarboxylic acid with 8-14 C-atoms and 1,4-butanediamine, as well as to polyamide products obtainable from the smelt, the polyamide consisting essentially of units derived from an aliphatic dicarboxylic acid with 8-14 C-atoms and 1,4-butanediamine. Such a process exhibits a high production rate, the polyamide crystallises rapidly and the polyamide has a higher melting point than the polyamides used in a process according to the state of the art. The polyamide objects have mechanical properties that are comparable with those of polyamide products with which the polyamide consists essentially of units derived from an aliphatic dicarboxylic acid with 8-14 C-atoms and 1,6-hexanediamine. Preferably 1,10-decanedioic acid or 1,12-dodecanedioic acid is chosen as the dicarboxylic acid. The invention also relates to a process for the preparation of a polyamide consisting essentially of units derived from an aliphatic dicarboxylic acid with 8-14 C-atoms and 1,4-butanediamine in which, successively, a first polymerisation of the diacarboxylic acid with 8-14 C-atoms and 1,4-butanediamine is effected in the fluid phase, resulting in a low-molecular polymer, followed by a post-polymerisation of the low-molecular polymer thus obtained in the solid phase, and to a polyamide consisting essentially of units derived from an aliphatic dicarboxylic acid with 8-14 C-atoms and 1,4-butanediamine, the number average molar mass being at least 15,000 g/m.