| 摘要 |
There are described transparent polyamides, and processes for producing them, which polyamides consist of recurring structural elements of the formula I <IMAGE> (I) <IMAGE> or of recurring structural elements of the formula II <IMAGE> (II) <IMAGE> [carbonyl groups in the structural elements (II) bound in the 1,3- and/or 1,4-position to the benzene nucleus, R1=C1-12-alkyl, R2=H, C1-12-alkyl, R3=C1-12-alkyl, C4-12-cycloalkyl, C7-8-aralkyl, unsubstituted or substituted aryl, R4=H, C1-12-alkyl, C4-12-cycloalkyl, C7-8-aralkyl, or unsubstituted or substituted aryl, or R3/R4 together=C3-11-alkylene, R5/R6 independently of one another=hydrogen or methyl, and R7/R8 together=C3-11-alkylene]. The polyamides according to the invention are suitable for producing transparent moulded articles of the widest variety, and are distinguished in particular by low water absorption, high stability to hydrolysis, and/or good dimensional stability under the action of moisture or humidity. |
