Monsanto Company

Michael M McNamara

Wayne T Mowe

James E Bromley

Darwyn E Walker

Nylon 66 yarn having particular stress-strain properties, typically also having a soft, luxuriant hand in fabric form. As compared to conventional nylon 66 with comparable boiling water shrinkage, the novel yarn exhibits a higher modulus at break, a lower modulus at 10% elongation, a positive stress index, and excellent denier uniformity. The process involves subjecting the yarn, within 0.016 to 0.11 seconds after solidification of the filaments, to a tension of 0.2 and 1.5 grams per final denier and heating the yarn to a temperature between 50.degree. and 250.degree. C. long enough to reduce yarn retraction below 1%.

Process for nylon 66 yarn having a soft hand

Polyamide yarn is melt spun at high speed and drawn almost immediately (between 0.002 and 0.25 seconds) after solidification. Turbine driven feed roll replaces conventional feed and separator roll. Process displays unusually low drawing tension, exceptionally uniform yarn.

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Gaffney, SC, United States of America

Michael M McNamara