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US 3,941,755 AGranted
Fiber-forming 6TA/6IA copolymers
AssigneeMonsanto Company
InventorsRichard D. Chapman, Donald A. Holmer, Oscar A. Pickett, Jr., James H. Saunders
Life of this patent
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Abstract
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.
Claims4
A fiber-forming copolymer consisting essentially of recurring units of the formulas:
- ##SPC2##
- wherein the mole ratio of units A to B is between about 60:40 to about 80:20 and wherein said copolymer in fiber form has a boiling water shrinkage between 10 and 30%.
Dependencies are inferred from the claim text.