Process for stain removal
View Patent ↗Disclosed are processes whereby stains on a variety of substrates may be removed by treating a stained area of a substrate with a solution of a sulfonamide compound. The sulfonamide-containing solutions are particularly useful as stain removal agents for stains which originate with body fluids such as blood, urine, vomit, feces etc. The stain removal solutions may be buffered to a predetermined pH. The stain removal solutions may further incorporate small percentages of low molecular weight alcohols and wetting agents.
1. A process for removing a stain from a substrate which comprises treating the substrate with a solution containing an effective amount of a halo active aromatic sulfonamide compound having the formula:
wherein X is a halogen;
R 3 is hydrogen, methyl, or COOM;
R 1 , R 2 , R 4 , R 5 are hydrogen, COOH, an ester or alkylated amide, COOM, CN, NO 2 , SO 3 H, a halogen, a substituted or unsubstituted phenyl group, a sulfonamide, or a halosulfonamide;
R 1 , R 2 , R 4 and R 5 are other than all hydrogen;
M is an alkali or alkaline earth metal; and
n is the number of water molecules per molecule of the halo active aromatic sulfonamide compound.
2. The process of claim 1 , wherein the substrate is a member selected from the group consisting of clothing, bedding, and flooring.
3. The process of claim 1 , wherein the concentration of the sulfonamide compound is from about 0.2 to about 10 weight percent.
4. The process of claim 1 , wherein the solution further incorporates an effective amount of a wetting agent which essentially does not react with the sulfonamide compound.
5. The process of claim 4 , wherein the wetting agent is an anionic or nonionic wetting agent.
6. The process of claim 1 , wherein the solution is buffered to a pH of from about 7 to about 10.
7. The process of claim 1 , wherein the pH of the solution is buffered to a pH of from about 8 to about 9.5.
8. The process of claim 1 , wherein the pH of the solution is buffered to a pH of greater than 10.
9. The process of claim 1 , wherein the solution further incorporates an effective amount of a low molecular weight alcohol.
10. The process of claim 1 , wherein R 1 and R 5 are H;
and two of R 2 , R 3 , and R 4 are other than hydrogen.
11. A process for removing a stain from a substrate which comprises treating the substrate with a solution containing an effective amount of a halo active aromatic sulfonamide compound having the formula:
wherein X is a halogen;
R 1 , R 2 , R 4 , R 5 are hydrogen, COOH, an ester or alkylated amide, COOM, CN, NO 2 , SO 3 H, a halogen, a substituted or unsubstituted phenyl group, a sulfonamide, or a halosulfonamide;
R 3 is an ester or alkylated amide, CN, NO 2 , SO 3 H, a halogen, a substituted or unsubstituted phenyl group, a sulfonamide, a halosulfonamide;
R 1 , R 2 , R 4 and R 5 are other than all hydrogen;
M is an alkali or alkaline earth metal; and
n is the number of water molecules per molecule of the halo active aromatic sulfonamide compound.