Claims
- 1. A method to continuously treat dyed nylon carpet fabric to impart improved resistance to staining comprising:
- preheating said dyed carpet fabric with water at a temperature between about 140.degree. and 212.degree. F. (60.degree. and 100.degree. C.) to a wet pick-up of above about 75% by weight, and a carpet temperature of between about 130.degree. and 210.degree. F. (54.4.degree. and 99.degree. C.), then
- extracting said water from said; carpet fabric to a wet pick-up of between about 30 to 190% by weight, then
- applying an aqueous solution of an effective amount to improve resistance to staining of a sulfonated aromatic condensate to said carpet fabric at a pH of between about 1.5 to 5.5, at a concentration of between about 0.25 and 40 grams of solids of said condensate per liter of aqueous solution, at a wet pick-up of between 200 and 650% by weight, at an aqueous solution liquor temperature of between about 140.degree. and 212.degree. F. (60.degree. and 100.degree. C.), to achieve a carpet fabric temperature between about 130.degree. and 210.degree. F. (54.4.degree. and 99.degree. C.), then
- holding said carpet in said aqueous solution for between about 0.5 to 90 seconds at a temperature above 130.degree. F. (54.4.degree. C.) wherein said aqueous solution also contains an effective amount to reduce yellowing of sulfonated aromatic condensate treated carpet of a thiocyanate wherein the thiocyanate cation is ammonium, sodium, potassium or zinc.
- 2. The method of claim 1 wherein said aqueous solution also contains an effective amount of a dispersing agent to make a stable mixture.
- 3. The method of claim 1 wherein said aqueous solution also contains an effective amount to improve exhaustion of the sulfonated aromatic condensate of a water-soluble salt having a divalent cation.
- 4. The method of claim 1 wherein said aqueous solution also contains an effective amount of water-soluble salt having a divalent cation to improve exhaustion of the sulfonated aromatic condensate.
- 5. The method of claim 1 wherein said aqueous solution is buffered with an effective amount to reduce yellowing of the treated carpet of citric acid or any other acid with a sequestering agent, whereby yellowing of said carpet fabric is decreased.
- 6. The method of claim 1 wherein said sulfonated aromatic condensate has been condensed with formaldehyde.
- 7. The method of claim 1 wherein said extracting is by applying vacuum to said wet carpet fabric.
- 8. The method of claim 1 wherein said extracting is by squeezing said wet carpet fabric.
- 9. The method of claim 1 wherein said aqueous solution is applied by pressurized contact with said carpet fabric and said wet pick up maximum is 450%.
- 10. The method of claim 1 wherein said aqueous solution is applied by spray and said wet pick-up minimum is 400%.
- 11. The method of claim 1 wherein said carpet fabric is held in said aqueous solution for between about 2 and 30 seconds.
- 12. The method of claim 6 wherein the sulfonated aromatic formaldehyde condensate is formed by condensation of formaldehyde with one or more phenols.
- 13. The method of claim 7 wherein the sulfonated aromatic formaldehyde is formed by condensation of formaldehyde with one or more phenols, at least one of which has been sulfonated.
- 14. The method of claim 12 wherein the condensate is formaldehyde condensed with an alkali metal salt of para-phenol sulfonic acid and with 4,4'-diphenolsulfone said aromatic being phenol or naphthalene.
- 15. The method of claim 1 wherein the dyed carpet fabric also comprises an effective amount of a fluorocarbon compound intended to improve resistance to soiling of the carpet.
- 16. The method of claim 15 wherein the fluorocarbon is the reaction product of a perfluoroalkyl alcohol or amide with a suitable anhydride or isocyanate.
- 17. The method of claim 1 wherein the thiocyanate is ammonium thiocyanate.
- 18. The method of claim 15 wherein said aqueous solution also contains an effective amount of dispersing agent to make a stable mixture.
- 19. The method of claim 18 wherein said dispersing agent is a condensed naphthalenic salt, an alkyl sulfosuccinate or mixtures thereof.
- 20. The method of claim 3 wherein said water-soluble salt is a calcium, magnesium or ferrous chloride, sulfate or phosphate.
- 21. The method of claim 20 wherein said water-soluble salt is magnesium sulfate.
Parent Case Info
This application is a continuation of application Ser. No. 101,652 filed Sep. 28, 1987 abn.
US Referenced Citations (20)
Continuations (1)
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Number |
Date |
Country |
Parent |
101652 |
Sep 1987 |
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