| 摘要 |
Salts of xylylenediamines and dicarboxylic acids (mole ratio 1:1) are produced by hydrogenation in presence of known hydrogenation catalysts of a solution or dispersion of a mixture of cyano-compound (1 mole) and dicarboxylic acid (0.9-1.1 mole) in a solvent for both reactants e.g. water or an aqueous alcohol solution. The cyano-compound is one or more of m- and p-cyanobenzylamines and iso- and tere-phthalonitriles. Acids used in examples are adipic, sebacic, succinic, and iso- and tere-phthalic but others are mentioned in the Specification. The salts may be converted into the corresponding monoamides by heating their aqueous solutions at above 200 DEG C.ALSO:Polyamides are produced by heating aqueous solutions of xylylene diamine/dicarboxylic acid salts (1:1 molar ratio) under autogenous pressure at above 200 DEG C. until converted to the corresponding monoamides and heating the resulting solution of the latter, optionally in presence of a copolymerizable compound, under a pressure not above atmospheric to evaporate the water and effect polymerization of the amide. Exemplified acids are adipic, sebacic, succinic, and iso-and tere-phthalic, but others are mentioned. The diamines are m-, p- or mixtures of the two; the copolymerizable compound may be caprolactam. |
