Patent ID: 9428612
Filing Date: 2016-08-30
CPC Classification: C08G,C08L

Claim Text:
1. A semi-crystalline semi-aromatic polyamide comprising units derived from diamines (A-A units) comprising aliphatic diamine and from dicarboxylic acids (B-B units) comprising terephthalic acid, wherein: (a) the dicarboxylic acids consist of a mixture of aromatic dicarboxylic acid and aliphatic dicarboxylic acid, wherein (b) the diamines consist of a mixture of long chain aliphatic diamine with 6-12 carbon atoms and short chain aliphatic diamine selected from the group consisting of 1,4 -butane diamine, 1,5 -pentanediamine and mixtures thereof, wherein the molar amount of the short chain aliphatic diamine is at least 10 mole %, relative to the total amount of diamines, and (c) the sum of the molar amount of the aromatic dicarboxylic acid and the long chain aliphatic diamine is 60-90 mole %, relative to the total molar amount of dicarboxylic acids and diamines.