| 摘要 |
Transparent copolyamides are obtained by reacting a mixture (A) of isophoronediamine and isophthalic acid, terephthalic acid or a mixture of isophthalic acid and terephthalic acid with a mixture (B) of a diamine <IMAGE> (II) <IMAGE> and terephthalic acid or a mixture of terephthalic acid and isophthalic acid or with a mixture (C) of a diamine <IMAGE> (III) <IMAGE> and terephthalic acid or isophthalic acid or mixtures thereof, R', R'' and R1 to R6 being as defined in the patent claim. The reaction can also be carried out with an excess of diamine and with addition of H3PO2 or salts thereof or white phosphorus. The novel copolyamides are distinguished by good thermoplastic processability, low water absorption and good resistance to hydrolysis, and are useful for the production of transparent mouldings.
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