US 11,814,609 B2
Detergent composition and methods of preventing aluminum discoloration
John Mansergh, Saint Paul, MN (US); Lisa M. Sanders, Saint Paul, MN (US); and Carter M. Silvernail, Saint Paul, MN (US)
Assigned to ECOLAB USA INC., Saint Paul, MN (US)
Filed by Ecolab USA Inc., Saint Paul, MN (US)
Filed on Aug. 25, 2021, as Appl. No. 17/445,913.
Application 17/445,913 is a continuation of application No. 15/939,956, filed on Mar. 29, 2018, granted, now 11,130,928.
Claims priority of provisional application 62/478,127, filed on Mar. 29, 2017.
Prior Publication US 2021/0388291 A1, Dec. 16, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C11D 3/33 (2006.01); C11D 3/00 (2006.01); C11D 11/00 (2006.01); C11D 3/37 (2006.01); C11D 3/10 (2006.01); C11D 3/04 (2006.01); C11D 3/08 (2006.01); C11D 17/00 (2006.01); C11D 17/06 (2006.01); C11D 1/72 (2006.01); C11D 1/722 (2006.01)
CPC C11D 3/33 (2013.01) [C11D 1/72 (2013.01); C11D 1/722 (2013.01); C11D 3/0026 (2013.01); C11D 3/044 (2013.01); C11D 3/08 (2013.01); C11D 3/10 (2013.01); C11D 3/3761 (2013.01); C11D 11/0029 (2013.01); C11D 17/0047 (2013.01); C11D 17/0056 (2013.01); C11D 17/0073 (2013.01); C11D 17/06 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A solid, alkaline, non-staining detergent composition comprising:
from about 60 wt-% to about 70 wt-% of a sodium carbonate alkalinity source;
from 12 wt-% to about 15 wt-% (by actives) of an alkali metal silicate;
from 5 wt-% to about 10 wt-% (by actives) of an ethylenediaminetetraacetic acid (EDTA) or salts thereof,
from about 1 wt-% to about 10 wt-% (by actives) of a methylglycine-N,N-diacetic acid (MGDA) or salts thereof;
from 2.5 wt-% to about 5 wt-% (by actives) of at least one water conditioning polymer comprising polymaleic acid homopolymer, a polyacrylic acid homopolymer, or combinations thereof, and
from about 1 wt-% to about 5 wt-% of an alcohol alkoxylate nonionic surfactant defoaming agent;
wherein the weight ratio by actives of the ethylenediaminetetraacetic acid (EDTA) or salts thereof to methylglycine-N,N-diacetic acid (MGDA) or salts thereof is at least about 1:1;
wherein the composition is substantially free of nitrilotriacetic acid (NTA); and
wherein the solid composition provides no aluminum discoloration when diluted in a use solution to a concentration of at least about 1500 ppm.