Aliphatic diamines make up Polyphthalamide. At 371 °C, PA6T homopolymer melts, making it unworkable. Lowering the melting point is necessary to create usable polymers, and this can be done in practise by copolymerizing 6I or using a longer diamine (with 9–12 carbon atoms). Three copolymers, PA 6T/66, PA 6T/"DT," and PA 6T/6I, have achieved commercial success (with Isophthalic acid). A copolymer is considered to be amorphous if IPA constitutes more than 55% of the acid portion of a PPA. PPAs produced using direct polycondensation methods have molar masses between 12,000 and 16,000 g/mol.
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