Patent ID: 6812323
Filing Date: 2004-11-02
Classification: C08G

Abstract:
A process for preparing a fiber-forming polyamide, which comprisesa) polymerizing starting monomers or starting oligomers in an aqueous reaction medium in the presence of at least one compound of the formula (I) R is a C1-C20 aliphatic saturated hydrocarbon R8 which bears 1-4 identical or different amide-forming groups R7, R1 is H, C1-C20-alkyl, cycloalkyl, benzyl or OR6, R6 is H, C1-C20-alkyl, cycloalkyl or benzyl, R7 is selected from the group consisting of â€”(NH)â€”, â€”(NHR9), carboxyl and carboxyl derivative groups, R9 is H, alkyl having from 1 to 8 carbon atoms, cycloalkyl having from 3 to 10 carbon atoms or alkylene having from 2 to 20 carbon atoms, R2, R3, R4 and R5 are independently C1-C10-alkyl, n is a natural number greater than 1, wherein the piperidine derivatives attached to R are identical or different with regard to the substituents R1, R2, R3, R4 and R5, and wherein the compound of the formula I is added to the starting monomers or to the polymerizing reaction mixture and becomes attached to the polyamide through reaction of at least one of the amide-forming groups R7, and allowing the polymerization to proceed until the polyamide exhibits a degree of polymerization which renders the polyamide capable of forming fibers; b) separating the polyamide from the reaction medium, and c) extracting the separated polyamide.