| US 7,592,301 B2 | ||
| Cleaning composition for handling water hardness and methods for manufacturing and using | ||
| Kim R. Smith, Woodbury, Minn. (US); Mark D. Levitt, St. Paul, Minn. (US); Stephen Engel, Mounds View, Minn. (US); David J. Falbaum, Minneapolis, Minn. (US); and Jerry D. Hoyt, Hastings, Minn. (US) | ||
| Assigned to Ecolab Inc., Eagan, Minn. (US) | ||
| Filed on Nov. 25, 2003, as Appl. No. 10/723,455. | ||
| Claims priority of provisional application 60/458196, filed on Nov. 27, 2002. | ||
| Prior Publication US 2004/0154640 A1, Aug. 12, 2004 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C11D 17/00 (2006.01) | ||
| U.S. Cl. 510—180 [510/181; 510/182; 510/476; 510/479; 510/499] | 12 Claims |
| 1. A cleaning composition comprising:
(a) an anionic surfactant and an alkanolamine; and
(b) a water hardness anti-precipitant mixture comprising 0.5-1.5 wt % of maleic anhydride/olefin co-polymer and 0.001-10 wt
% of EO-PO co-polymer at a weight ratio of the maleic anhydride/olefin co-polymer to the EO-PO co-polymer of between about
1:75 and about 75:1, wherein the amount of the water hardness anti-precipitant mixture to the anionic surfactant and amine
is sufficient to prevent visible precipitation when the cleaning composition is diluted with dilution water having one grain
hardness at a weight ratio of 1:1;
(c) the EO-PO co-polymer having the formula:
(EO)x(PO)y(EO)x
(PO)y(EO)x(PO)y
(PO)y(EO)x(PO)y(EO)x(PO)y wherein EO is an ethylene oxide group, PO is a propylene oxide group, x is between about 10 to about 130 and y is between
about 15 to about 70.
|