Method for increasing brightness retention of laundered fabrics

Details Method for increasing brightness retention of laundered fabrics Method for increasing brightness retention of laundered fabrics

D - Textiles, Paper

06

L

D06L 3/12 (2006.01) C11D 1/83 (2006.01) C11D 1/94 (2006.01) C11D 3/20 (2006.01) C11D 3/34 (2006.01) C11D 3/395 (2006.01) C11D 3/42 (2006.01) C11D 11/00 (2006.01) D06L 3/08 (2006.01) C11D 1/22 (2006.01) C11D 1/24 (2006.01) C11D 1/75 (2006.01) C11D 1/90 (2006.01)

Patent

CA 2280259

The invention provides a method for increasing the brightness retention of a laundered fabric after numerous washing cycles by adding to an aqueous wash liquor a quantity of a commercial laundry detergent which delivers at least 0.1 g of an optical brightener into said wash liquor; and prior to, concurrent with, or after the commercial laundry detergent, adding a bleaching composition in an amount of at least about 0.5g/L. The bleaching composition contains about 2.5-10% alkali metal hypochlorite; about 0.05-5% of a bleach stable surfactant bearing at least one nitrogen atom; a bleach stable anionic surfactant or a hydrotrope, wherein the ratio of (ii) to (iii) is between about 10:1 to about 1:10; and an effective amount of a source of alkalinity. The fabric is repeatedly washed and the optical brightener is enabled to deposit on the fabric to increase versus a control a Stensby whiteness measure of at least about .DELTA. W=4.

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