POLYAMIDE, POLYAMIDE COMPOSITION, AND MOLDED POLYAMIDE

摘要

A polyamide which is either a polyamide comprising, as the main structural units, units derived from an aliphatic dicarboxylic acid and an aromatic diamine or a polyamide comprising, as the main structural units, units derived from an aromatic dicarboxylic acid and an aliphatic diamine, characterized in that when the polyamide is dissolved in a solvent for <SUP>31</SUP>P-NMR spectroscopy and the resultant solution is subjected to structure analysis after trifluoroacetic acid is added thereto, then the content of phosphorus atoms (P1) derived from a phosphorus compound of a specific structure detected is 10 ppm or higher. Features of the polyamide reside in that the polyamide has satisfactory thermal stability during drying or molding, that the polyamide hence does not deteriorate in color tone and is less apt to generate gel particles or other undesirable substances, and that these properties do not particularly deteriorate even when a recovered article of the polymer is mixed and used. The polyamide has excellent productivity in molding. Also provided are a polyamide composition containing the polyamide and a molded polyamide obtained from the polyamide composition.