Minimizing ozone fading in dyed polyamides by treating same with substituted piperidine thioureas
AssigneeAkzona Incorporated
InventorsDavid A. Johnson, Robert L. Lilly
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Abstract
There is disclosed a method for minimizing ozone fading in dyed polyamides by treating the dyed polyamide with a substituted piperidine thiourea of the formula ##STR1## where R is a lower alkyl radical having 1-5 carbon atoms or phenyl. The treated dyed polyamides, preferably in fiber form, display minimize ozone fade without a reduction in light stability.
Claims16
A method of minimizing ozone fading in a dyed polyamide without reducing the light stability of the dyed polyamide comprising:
- treating a dyed polyamide with an ozone fade minimizing effective amount of a substituted piperidine thiourea of the formula:
- ##STR7## wherein R is selected from the group consisting of lower alkyls having from 1 to 5 carbon atoms and phenyl.
A polyamide fiber having incorporated therein an ozone fade reducing quantity of a substituted piperidine thiourea of the formula:
- ##STR8## wherein R is selected from the group consisting of lower alkyls having from 1 to 5 carbon atoms and phenyl.
Dependencies are inferred from the claim text.