Oligomeric semicarbazide additives for spandex
AssigneeE. I. Du Pont de Nemours and Company
InventorAkitsugu Kawaguchi
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Abstract
A spandex fiber is provided with discoloration resistance by a synergistic combination of a hydroxyphenyl-1,3,5-triazine ultraviolet light absorber and N,N-dialkylsemicarbazide groups, the groups being attached to the ends of the spandex polymer or as a substituent of an additive.
Claims8
A polyether-based spandex fiber containing, for protection against discoloration by atmospheric fumes and light, a synergistic combination of N,N-dialkylsemicarbazide groups and a hydroxyphenyl-1,3,5-triazine light absorber, the semicarbazide groups being present as spandex polymer end groups or as substituents on an additive in a concentration range of 10 to 60 millequivalents per kilogram of spandex fiber and
- the light absorber being present in a concentration range of 0.2 to 2 percent based on the weight of the spandex fiber and being 2,4-di(2',4'-dimethylphenyl)-6-(2"-hydroxy-4"-alkoxyphenyl)-1,3,5-triazine , the alkoxy group having 1 to 12 carbon atoms.
Dependencies are inferred from the claim text.