US 12,252,666 B2
Rinse aid formulation for cleaning automotive parts
Alissa Ellingson, Saint Paul, MN (US); and Janel Marie Kieffer, Saint Paul, MN (US)
Assigned to ECOLAB USA INC., Saint Paul, MN (US)
Filed by ECOLAB USA INC., Saint Paul, MN (US)
Filed on Jul. 14, 2023, as Appl. No. 18/352,419.
Application 18/352,419 is a continuation of application No. 17/448,980, filed on Sep. 27, 2021, granted, now 11,746,306.
Application 17/448,980 is a continuation of application No. 16/521,810, filed on Jul. 25, 2019, granted, now 11,155,769, issued on Oct. 26, 2021.
Prior Publication US 2023/0357667 A1, Nov. 9, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C11D 1/72 (2006.01); B08B 3/04 (2006.01); C11D 1/722 (2006.01); C11D 1/825 (2006.01); C11D 1/83 (2006.01); C11D 3/04 (2006.01); C11D 3/20 (2006.01); C11D 3/34 (2006.01); C11D 3/37 (2006.01)
CPC C11D 1/8255 (2013.01) [C11D 3/042 (2013.01); C11D 3/2072 (2013.01); C11D 3/3418 (2013.01); C11D 1/72 (2013.01); C11D 1/722 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hard surface rinse aid composition comprising:
(A) from about 0.5 wt-% to about 3 wt-% of a nonionic alcohol alkoxylate surfactant according to the formula (I):
R1-O-(EO)x1(PO)y1-H  (I)
wherein R1 is a straight-chain C10-C16 alkyl, wherein x1 is from 4 to 8, and wherein y1 is from 2 to 5;
(B) from about 0.5 wt-% to about 3 wt-% of a nonionic alcohol alkoxylate surfactant according to the formula (II):
R2-O-(EO)x2-H  (II)
wherein R2 is C10-C14 alkyl with an average of at least 2 branches per residue, and
wherein x2 is from 5 to 10;
(C) a reverse block co-polymer surfactant according to the formula (III):

OG Complex Work Unit Chemistry
wherein x is from 15-25, y is from 10 to 25, and z is from 15 to 25;
(D) an acidic preservative composition comprising an anionic hydrotrope and an aluminum compatible preservative comprising diphosphonic acid or salt thereof; and
(E) water, wherein the weight percent ratio of the anionic hydrotrope to water is from about 0.1:1 to about 0.5:1, wherein a use solution of the composition has a pH between about 4 to about 7 and is free of a detergent alkalinity source.