Patent ID: 8501071

Claim:
A method for obtaining high-tenacity aramid yarn, wherein the yarn has a tenacity of at least 2750 mN/tex and is made of a copolymer obtained from a mixture of monomers comprising at least 12.5 mole% DAPBI, an aromatic para-diamine, and an aromatic para-diacid, and the yarn is heated in at least two process steps, the process steps comprising: a first step where the yarn is heated at a temperature of 200to 360° C. at a tension of at least 0.2cN/dtex, followed by a second step where the yarn is heated at a temperature of 370to 500° C. at a tension of less than 1 cN/dtex, wherein the tension in the first process step is higher than in the second process step.