Sulfur dye protection systems and compositions and methods employing same
AssigneeBoard of Regents of the University of Nebraska
InventorJiping Wang
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Abstract
The present invention relates to sulfur dye protection systems and compositions and methods employing same, as well as processes for making sulfur dyes, especially bleach stable sulfur dyes, processes for dying textiles with sulfur dyes and textiles dyed by such processes. More particularly, the present invention relates to modifying existing dyes and/or making newly formed sulfur dyes. Even more particularly, the present invention relates to materials that can chemically or physically interact with sulfur dyes to protect the sulfur dyes from oxidation by oxidizing agents, such as bleaching agents.
Claims16
A method for reducing aging of a textile which is dyed with a sulfur dye, said aging being caused by acid tendering associated with the decomposition of said dye, comprising the step of contacting said textile with a solution comprising a Lanthanide metal ion during the wash cycle of a laundering operation.
A method according to 1 wherein said Lanthanide metal ion is a member selected from the group consisting of La(III), Ce(IV), Gd(III) and mixtures thereof.
A method for reducing aging of a textile which is dyed with a sulfur dye, said aging being caused by acid tendering associated with the decomposition of said dye, comprising the step of contacting said textile with a solution comprising a Lanthanide metal ion during the rinse step of a laundering operation.
Dependencies are inferred from the claim text.