US 12,187,985 B2
Alkaline cleaning compositions comprising a hydroxyphosphono carboxylic acid and methods of reducing metal corrosion
Jennifer Stokes, Saint Paul, MN (US); Carter M. Silvernail, Saint Paul, MN (US); Paul Frazer Schacht, Saint Paul, MN (US); Anthony W. Erickson, Saint Paul, MN (US); and Peter E. Reed, Naperville, IL (US)
Assigned to ECOLAB USA INC., Saint Paul, MN (US)
Filed by ECOLAB USA INC., Saint Paul, MN (US)
Filed on Aug. 31, 2020, as Appl. No. 17/008,169.
Application 17/008,169 is a division of application No. 15/904,849, filed on Feb. 26, 2018, granted, now 10,793,809.
Claims priority of provisional application 62/464,938, filed on Feb. 28, 2017.
Prior Publication US 2020/0392430 A1, Dec. 17, 2020
Int. Cl. C11D 3/00 (2006.01); C11D 1/02 (2006.01); C11D 1/38 (2006.01); C11D 1/66 (2006.01); C11D 1/88 (2006.01); C11D 3/04 (2006.01); C11D 3/20 (2006.01); C11D 3/36 (2006.01)
CPC C11D 3/2086 (2013.01) [C11D 1/02 (2013.01); C11D 1/38 (2013.01); C11D 1/66 (2013.01); C11D 1/88 (2013.01); C11D 3/0047 (2013.01); C11D 3/044 (2013.01); C11D 3/365 (2013.01); C11D 2111/14 (2024.01); C11D 2111/16 (2024.01); C11D 2111/44 (2024.01)] 14 Claims
OG exemplary drawing
 
1. A hard surface cleaning system comprising:
a multi-part cleaning system consisting essentially of:
a composition consisting essentially of an alkali metal hydroxide alkalinity source,
a composition consisting essentially of a hydroxyphosphono carboxylic acid and optionally a surfactant, and
a composition consisting essentially of a peroxycarboxylic acid oxidizer and optionally a peroxide oxidizer;
wherein the hydroxyphosphono carboxylic acid is in a separate composition from the alkali metal hydroxide alkalinity source until preparation of a use solution;
wherein the peroxycarboxylic acid oxidizer is in a separate composition from the hydroxyphosphono carboxylic acid and the alkali metal hydroxide alkalinity source until preparation of a use solution;
wherein the multi-part cleaning system is a concentrated multi-part cleaning system and the alkalinity source is at a concentration of between about 10 wt. % and about 50 wt. % (active);
wherein the cleaning system provides a pH of at least about 9 upon dilution; and
a hard surface, wherein the hard surface is a food processing stainless steel clean-in-place surface, clean-out-of-place surface, or heat processing surface.