	US 12,465,048 B2
	Defoamer useful in a peracid composition with anionic surfactants
Junzhong Li, Saint Paul, MN (US); Richard Staub, Saint Paul, MN (US); and David D. McSherry, Saint Paul, MN (US)
Assigned to ECOLAB USA INC., Saint Paul, MN (US)
Filed by ECOLAB USA INC., Saint Paul, MN (US)
Filed on Nov. 18, 2021, as Appl. No. 17/455,563.
Application 17/455,563 is a continuation of application No. 16/182,291, filed on Nov. 6, 2018, granted, now 11,206,826.
Application 16/182,291 is a continuation of application No. 13/785,047, filed on Mar. 5, 2013, granted, now 10,165,774, issued on Jan. 1, 2019.
Prior Publication US 2022/0071203 A1, Mar. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A01N 37/16 (2006.01); A01N 59/00 (2006.01)

CPC A01N 37/16 (2013.01) [A01N 59/00 (2013.01)]

18 Claims

1. A low-foaming equilibrium peracid composition comprising:

a C₁-C₂₂peroxycarboxylic acid;

a C₁-C₂₂carboxylic 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.