Methods and compositions for treating laundry items

• US 10,017,893 B2
• Filed: 01/22/2014
• Issued: 07/10/2018
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Fulmer, Gregory R., Ghosh, Kaustav, Leep, Nicholas, Pinkowski, Robert J., Schneemann, Jason M.
• Primary Examiner(s): Khan, Amina S
• Application Number:
  US14/160,777
• Publication Number:
  US 20140259444A1
• Time in Patent Office: 1,630 Days
• CPC Class Codes: C11D 1/62 Quaternary ammonium compounds
• CPC Class Codes: C11D 1/72 Ethers of polyoxyalkylene glycols
• CPC Class Codes: C11D 1/835 Mixtures of non-ionic with cationic compounds
• CPC Class Codes: C11D 2111/12 Soft surfaces, e.g. textile
• CPC Class Codes: C11D 3/0021 Dye-stain or dye-transfer inhibiting compositions
• CPC Class Codes: D06F 2101/04 Quantity, e.g. weight
• CPC Class Codes: D06F 2103/04 Quantity, e.g. weight or variation of weight
• CPC Class Codes: D06F 2105/42 Detergent or additive supply
• CPC Class Codes: D06F 33/37 of metering of detergents or additives
• CPC Class Codes: D06M 13/395 Isocyanates
• CPC Class Codes: D06M 13/402 Amides imides, sulfamic acids
• CPC Class Codes: G05B 15/02 electric

Abstract

A method of operating a laundry treating appliance having a rotating drum at least partially defining a treating chamber for the receipt of laundry for treatment according to an automatic cycle of operation includes a dye fixative removal phase that includes supplying heated water in the treating chamber and adjusting the pH of the heated water.

Claims

1. A method of operating a laundry treating appliance having a rotating drum at least partially defining a treating chamber for the receipt of laundry for treatment according to an automatic cycle of operation, the method comprising:

a wash phase where wash liquid containing detergent is introduced into the treating chamber and thereby applied to any laundry in the treating chamber;

after the wash phase, a rinse phase where fresh water is introduced into the treating chamber to rinse wash liquid from any laundry in the treating chamber;

a dye fixative addition phase during or before the wash phase where dye fixative is introduced into the treating chamber and the laundry is treated with the dye fixative at least during the wash phase; and

a dye fixative removal phase following the rinse phase comprising;

a dye fixative desorption phase comprising;

supplying heated water to the treating chamber, with the heated water having a temperature of at least 110°

F. when the heated water is within the treating chamber;

adjusting the pH of the supplied heated water to a pH greater than 9 to form an alkaline liquid by at least one of electrolying the heated water or mixing a basic agent with the heated water; and

moving the formed alkaline liquid through laundry in the treating chamber to decrease an adhesion force between the dye fixative and the laundry.

2. The method of claim 1 wherein the supplying of the heated water comprises heating the water within the treating chamber to a temperature of at least 110°

F. if the heated water in the treating chamber is less than 110°

F.

3. The method of claim 1 wherein the rinse phase comprises repeatedly supplying rinse liquid and draining of the supplied rinse liquid from the treating chamber.

4. The method of claim 1 wherein the supplying heated water comprises supplying water to the treating chamber and heating the water to above 110°

F. to form the heated water, if the supplied water is less than 110°

F.

5. The method of claim 1 wherein the basic agent comprises at least one of powdered alkaline build detergents, ammonium hydroxide, or buffered ingredients.

6. The method of claim 1 wherein moving at least one of the alkaline liquid or the wash liquid comprises recirculating the at least one of the alkaline liquid or wash liquid within the treating chamber.

7. The method of claim 1 further comprising supplying mechanical energy to the treating chamber during the dye fixative removal phase.

8. The method of claim 7 wherein supplying mechanical energy comprises at least one of moving a clothes mover within the treating chamber or rotating the drum.

9. The method of claim 1 further comprising executing the dye fixative removal phase only for laundry comprising white fabrics.

10. The method of claim 9 wherein the dye fixative removal phase is executed when the wash phase is a whites wash phase.

11. The method of claim 1 wherein the dye fixative removal phase is executed automatically based on sensor output indicative of a presence of a dye fixative or based on a user input via a user interface of the laundry treating appliance.