Monsanto Company

James H Saunders

Oscar A Pickett, Jr

Richard D Chapman

Donald A Holmer

Fiber-forming polymers are prepared from a mixture of the hexamethylene diamine salts of terephthalic acid, isophthalic acid, and a small amount of at least one aliphatic dibasic acid (e.g. adipic acid) having from 5 to 12 carbon atoms. The polymers can be prepared in a batch autoclave and extruded therefrom without cleaning the autoclave between successive runs.

Polyamides derived from hexamethylene diamine, terephthalic acid,

Dimensionally stable fibers are produced from copolymers prepared from substantially equimolar amounts of hexamethylene diamine and a 50:50 to 80:20 mixture of terephthalic and isophthalic acids by heating essentially amorphous fibers melt spun from the copolymers to a temperature between about 160.degree. C. and 300.degree. C. for a short period of time. The dimensionally stable fibers combine many of the best properties of nylon 66 and poly(ethylene terephthalate) and are particularly useful in tire and textile applications.

Dimensionally stable 6TA/6IA fibers

Copolymers made from hexamethylenediamine and a mixture of tere- and isophthalic acids in which the mixture contains between about 60 and 80 mole percent terephthalic acid are described as well as useful fibers prepared therefrom.

Growing community of inventors

Pensacola, FL, United States of America

James H Saunders