US 12,234,429 B2
Sustainable laundry sour compositions with iron control
Sukhwan Soontravanich, Saint Paul, MN (US); Stephan Hubig, Saint Paul, MN (US); and Altony J. Miralles, Saint Paul, MN (US)
Assigned to ECOLAB USA INC., Saint Paul, MN (US)
Filed by ECOLAB USA INC., Saint Paul, MN (US)
Filed on May 19, 2022, as Appl. No. 17/664,094.
Application 17/664,094 is a continuation of application No. 17/248,959, filed on Feb. 15, 2021, granted, now 11,339,357.
Application 17/248,959 is a continuation of application No. 15/693,828, filed on Sep. 1, 2017, granted, now 10,927,328, issued on Feb. 23, 2021.
Application 15/693,828 is a continuation of application No. 14/790,133, filed on Jul. 2, 2015, granted, now 9,783,767, issued on Oct. 10, 2017.
Application 14/790,133 is a continuation of application No. 13/288,074, filed on Nov. 3, 2011, abandoned.
Prior Publication US 2022/0275311 A1, Sep. 1, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C11D 3/04 (2006.01); C11D 3/00 (2006.01); C11D 3/20 (2006.01); C11D 3/33 (2006.01); C11D 3/37 (2006.01); C11D 7/08 (2006.01); C11D 7/26 (2006.01); C11D 7/32 (2006.01); C11D 17/00 (2006.01); C11D 17/06 (2006.01); D06L 1/16 (2006.01); D06L 1/20 (2006.01)
CPC C11D 17/06 (2013.01) [C11D 3/0036 (2013.01); C11D 3/042 (2013.01); C11D 3/2075 (2013.01); C11D 3/2079 (2013.01); C11D 3/2086 (2013.01); C11D 3/33 (2013.01); C11D 3/3765 (2013.01); C11D 7/08 (2013.01); C11D 7/265 (2013.01); C11D 7/3245 (2013.01); C11D 17/0047 (2013.01); D06L 1/16 (2013.01); D06L 1/20 (2013.01); C11D 2111/12 (2024.01); C11D 2111/14 (2024.01)] 13 Claims
OG exemplary drawing
 
1. A method for treating linen, to reduce or eliminate iron deposition/redeposition comprising:
washing the linen with a detergent at an alkaline pH in a washing machine;
rinsing said linen;
obtaining a liquid linen treatment composition consisting of: about 15 wt. % to about 45 wt. % of a hydroxycarboxylic acid which is selected from one or more of: glycolic acid, malic acid, lactic acid, tartaric acid, citric acid, hydroxybutyric acid, glyceric acid, tartronic acid, salicylic acid, m-hydroxybenzoic acid, p-hydroxybenzoic acid, gallic acid, mandelic acid and gluconic acid; about 1 wt. 1% about 10 wt. % of a carboxylate polymer which is a polyacrylic acid salt, a polymaleic acid salt, or a combination thereof; water in the amount of between about 15 wt. % and about 45 wt. %; about 12 wt. % to about 21 wt. % of sulfuric acid form urea sulfate; and optionally one or more additives selected from a chelating agent, a dye, a perfume, an additional acid source, a surfactant and/or a defoamer;
applying the linen treatment composition or a use solution of said linen treatment composition to said linen; wherein the use solution of the linen treatment composition has a pH of between about 3 and about 10; and
reducing or eliminating iron deposition or redeposition on said linen,
wherein the linen treatment composition is free of a peroxycarboxylic acid and is applied prior to washing said linen, after washing said linen, during washing of said linen, or multiple times throughout the method.