Granted Patent B2

US 12,465,048 · App. 17/455,563 · Granted Nov 11, 2025

Inventors: Junzhong Li (Saint Paul, MN); Richard Staub (Saint Paul, MN); David D. McSherry (Saint Paul, MN)

Assignee: ECOLAB USA INC.

A01N37/16A01N59/00

Abstract

Claims (44)

1 . A low-foaming equilibrium peracid composition comprising:

a C 1 -C 22 peroxycarboxylic acid;

a C 1 -C 22 carboxylic acid;

hydrogen peroxide;

a mineral acid;

from about 0.01 wt-% to less than about 10 wt-% of an anionic surfactant; and

from about 0.4 wt-% to about 10 wt-% of a metal salt defoaming agent, wherein the metal salt defoaming agent is an aluminum salt, a magnesium salt, a calcium salt, a zinc salt and/or a salt of a rare earth metal; and

wherein said composition has a use solution pH below about 4; and

wherein the defoaming agent and anionic surfactant provide enhanced biocidal efficacy for the composition.

2 . The composition of claim 1 , wherein the C 1 -C 22 peroxycarboxylic acid comprises from about 1 wt-% to about 40 wt-%, the C 1 -C 22 carboxylic acid comprises from about 1 wt-% to about 80 wt-%, the hydrogen peroxide comprises from about 1 wt-% to about 80 wt-%, the mineral acid comprises from about 5 wt-% to about 50 wt-%, the surfactant comprises from about 0.01 wt-% to about 5 wt-%, and the defoaming agent comprises from about 0.4 wt-% to about 5 wt-%, each wt-% based on the total weight of the composition.

3 . The composition of claim 1 , further comprising at least one additional agent selected from the group consisting of a hydrotrope, a solvent, a stabilizing agent, a fluorescent active agent and combinations thereof.

4 . The composition of claim 1 , wherein the C 1 -C 22 peroxycarboxylic acid is a C 2 -C 20 peroxycarboxylic acid and wherein the C 1 -C 22 carboxylic acid is a C 2 -C 20 carboxylic acid.

5 . The composition of claim 4 , wherein the peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid and/or peroxysulfonated oleic acid, and wherein the carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid or a combination of the same.

6 . The composition of claim 1 , wherein the defoaming agent is aluminum sulfate.

7 . The composition of claim 1 , wherein the pH of the use solution is below about 3.

8 . The composition of claim 1 , wherein the defoaming agent is aluminum sulfate and the anionic surfactant is sodium octane sulfonate and sulfonated oleic acid.

9 . The composition of claim 1 , further comprising a peroxycarboxylic acid stabilizing agent, wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA):

wherein R 1 is OH or —NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof;

or a compound having the following Formula (IB):

wherein R 1 is OH or —NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof, wherein the stabilizing agent delays or prevents the peroxycarboxylic acid from exceeding its self-accelerating decomposition temperature (SADT).

10 . A low-foaming, stabilized equilibrium peracid composition comprising:

from about 1 wt-% to about 40 wt-% of a C 1 -C 22 peroxycarboxylic acid;

from about 1 wt-% to about 80 wt-% of a C 1 -C 22 carboxylic acid;

from about 1 wt-% to about 80 wt-% of hydrogen peroxide;

from about 1 wt-% to about 50 wt-% of a mineral acid;

from about 0.01 wt-% to less than about 10 wt-% of an anionic surfactant;

from about 0.4 wt-% to about 10 wt-% of a metal salt defoaming agent, wherein the metal salt defoaming agent is an aluminum salt, a magnesium salt, a calcium salt, a zinc salt and/or a salt of a rare earth metal; and

from about 0.01 wt-% to about 10 wt-% of a peroxycarboxylic acid stabilizing agent,

wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA):

wherein R 1 is OH or —NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof;

or a compound having the following Formula (IB):

wherein R 1 is OH or —NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof;

wherein said composition has a use solution pH below about 4; and

wherein the defoaming agent and anionic surfactant provide enhanced biocidal efficacy for the composition.

11 . The composition of claim 10 , wherein the C 1 -C 22 peroxycarboxylic acid comprises from about 1 wt-% to about 20 wt-%, the C 1 -C 22 carboxylic acid comprises from about 1 wt-% to about 50 wt-%, the hydrogen peroxide comprises from about 1 wt-% to about 50 wt-%, the mineral acid comprises from about 1 wt-% to about 20 wt-%, the surfactant comprises from about 0.1 wt-% to about 5 wt-%, the defoaming agent comprises from about 0.4 wt-% to about 5 wt-%, and the stabilizing agent comprises from about 0.01 wt-% to about 1 wt-%, each wt-% based on the total weight of the composition.

12 . The composition of claim 10 , further comprising a hydrotrope, a solvent or combinations thereof.

13 . The composition of claim 10 , wherein the C 1 -C 22 peroxycarboxylic acid is a C 2 -C 20 peroxycarboxylic acid and wherein the C 1 -C 22 carboxylic acid is a C 2 -C 20 carboxylic acid.

14 . The composition of claim 13 , wherein the peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid and/or peroxysulfonated oleic acid, and wherein the carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid or a combination of the same.

15 . The composition of claim 10 , wherein the defoaming agent is aluminum sulfate.

16 . A method for reducing a microbial population using a low-foaming equilibrium peroxycarboxylic acid composition comprising:

providing the peroxycarboxylic acid composition of claim 1 ; and

contacting a surface or substrate with a use solution of said composition for sufficient time to reduce a microbial population, wherein said use solution has a pH below about 4.

17 . The method of claim 16 , wherein the C 1 -C 22 peroxycarboxylic acid is a C 2 -C 20 peroxycarboxylic acid selected from the group consisting of peroxyacetic acid, peroxyoctanoic acid, peroxysulfonated oleic acid and combinations thereof, wherein the C 1 -C 22 carboxylic acid is a C 2 -C 20 carboxylic acid selected from the group consisting of acetic acid, octanoic acid, sulfonated oleic acid and combinations thereof, and wherein the defoaming agent is an aluminum salt, a magnesium salt, a calcium salt, a zinc salt and/or a salt of a rare earth metal.

18 . The method of claim 16 , wherein the contacting step lasts for at least 10 seconds, and wherein the surface or substrate is a food item, plant item, animal item, a container, an equipment, a system or a facility for growing, holding, processing, packaging, storing, transporting, preparing, cooking or serving the food item, plant item or the animal item, an instrument, a hard surface, equipment, a fabric surface, a fouled water or industrial processing liquid source, liquid system, or process water used in oil, gas and/or industrial processing operations.

Assignments (1)

Continuity (3)

References Cited (400)