Sulfur dye protection systems and compositions and methods employing same
AssigneeThe Procter & Gamble Company
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.
Claims43
A composition comprising a material that interacts with a sulfur dye such that oxidation of the sulfur dye by oxidizing agents is inhibited and/or reduced.
The method according to claim 13 wherein the sulfur dye-containing fabric in need of treatment is contacted with the composition prior to washing the sulfur dye-containing fabric.
The method according to claim 13 wherein the sulfur dye-containing fabric in need of treatment is contacted with the composition during the washing cycle of a conventional wash comprising the sulfur dye-containing fabric.
The method according to claim 13 wherein the sulfur dye-containing fabric in need of treatment is contacted with the composition during the rinsing cycle of a conventional wash comprising the sulfur dye-containing fabric.
A method for dyeing a fabric in need of treatment comprising contacting the fabric with a dyeing composition comprising a sulfur dye protection system and a sulfur dye.
A method for finishing a fabric in need of treatment comprising contacting the fabric with a finishing composition comprising a sulfur dye protection system and a finishing agent.
A process for making bleach stable sulfur dyes comprises-the step of:
- modifying a sulfur dye in need of modification such that the modified sulfur dye exhibits increased bleach stability as compared to the unmodified sulfur dye.
The process according to claim 21 wherein the step of modifying the sulfur dye in need of modification comprises reacting the sulfur dye with a source of one or more metal ions.
The process according to claim 22 wherein the one or more metal ions comprise an electron configuration such that the one or more metal ions are at their most stable oxidation state.
The process according to claim 22 wherein the one or more metal ions comprise a transition metal ion.
The process according to claim 24 wherein the transition metal ion is selected from the group consisting of:
- Ni(II), Co(II), Pd(II), Pt(II), Sn(IV), Pb(II), Hg(II) and mixtures thereof.
The process according to claim 26 wherein the lanthanide metal ion is selected from the group consisting of:
- La(III), Ce(IV), Gd(III) and mixtures thereof.
A dyed textile made by the process according to claim 28.
A process for making bleach stable sulfur dyes comprises the steps of:
- a. making a sulfur dye by reacting one or more organic compounds with a sulfur-containing compound to form the sulfur dye;
- and
- b. reacting the sulfur dye with a stabilizing agent such that the sulfur dye exhibits increased bleach stability as compared to the sulfur dye in the absence of such a stabilizing agent.
The process according to claim 30 wherein the one or more organic compounds comprises one or more organic aromatic compounds.
The process according to claim 31 wherein one or more organic aromatic compounds is selected from the group consisting of aromatic amines, phenols, or nitro compounds and mixtures thereof.
The process according to claim 31 wherein the one or more organic aromatic compound produce a color selected from the group consisting of:
- black, brown, yellow, orange, red, blue, green and shades thereof and mixtures thereof.
The process according to claim 35 wherein the sulfur-containing compound comprises a disulfide bond.
The process according to claim 37 wherein the one or more metal ions comprise an electron configuration such that the one or more metal ions are at their most stable oxidation state.
The process according to claim 37 wherein the one or more metal ions comprise a transition metal ion.
The process according to claim 39 wherein the transition metal ion is selected from the group consisting of:
- Ni(II), Co(II), Pd(II), Pt(II), Sn(IV), Pb(II), Hg(II) and mixtures thereof.
The process according to claim 41 wherein the lanthanide metal ion is selected from the group consisting of:
- La(III), Ce(IV), Gd(III) and mixtures thereof.
A dyed textile made by the process according to claim 43.
Dependencies are inferred from the claim text.