US 12,281,283 B2
Method of laundering fabric
Laura Bueno Romo, Newcastle upon Tyne (GB); Carlos Amador Zamarreno, Newcastle upon Tyne (GB); Anju Deepali Massey Brooker, Newcastle upon Tyne (GB); Libbi Moon, Newcastle upon Tyne (GB); Philip Frank Souter, Northumberland (GB); and Eric San Jose Robles, Newcastle upon Tyne (GB)
Assigned to The Procter & Gamble Company, Cincinnati, OH (US)
Filed by The Procter & Gamble Company, Cincinnati, OH (US)
Filed on Oct. 2, 2020, as Appl. No. 17/061,585.
Claims priority of application No. 19202665 (EP), filed on Oct. 11, 2019.
Prior Publication US 2021/0108156 A1, Apr. 15, 2021
Int. Cl. C11D 3/04 (2006.01); C11D 1/22 (2006.01); C11D 3/20 (2006.01); C11D 3/36 (2006.01); C11D 3/386 (2006.01)
CPC C11D 3/046 (2013.01) [C11D 1/22 (2013.01); C11D 3/2086 (2013.01); C11D 3/361 (2013.01); C11D 3/364 (2013.01); C11D 3/38618 (2013.01); C11D 2111/12 (2024.01)] 12 Claims
 
1. A method of laundering fabrics, comprising the steps of:
(a) contacting a laundry detergent to water to form a wash liquor, wherein the laundry detergent comprises detersive surfactant, and wherein the wash liquor comprises detersive surfactant at a concentration in the range of from about 100 ppm to about 2500 ppm;
(b) contacting fabric to the wash liquor, and washing the fabric in the wash liquor;
(c) after a period of time of at least about 6 minutes from contacting the fabric to the wash liquor, introducing calcium cations into the wash liquor to form a calcium enriched wash liquor, wherein the calcium enriched wash liquor comprises calcium cations at a concentration in the range of from about 20 ppm to about 400 ppm;
(d) washing the fabric in the calcium-enriched wash liquor for a period of time of at least about 2 minutes; and
(e) removing the excess calcium-enriched wash liquor from the fabric and rinsing the fabric in water.