Granted Patent B2

US 12,473,519 · App. 17/234,706 · Granted Nov 18, 2025

Inventors: Frank Janssen (Cologne, DE); David Matulla (Hilden, DE); Beate Seebauer (Langenfeld, DE); Birgit Scheffers (Duesseldorf, DE); Susanne Schneider (Duesseldorf, DE); Dorothea Kapitza (Duesseldorf, DE)

Assignee: Henkel AG & Co. KGaA

C11D17/06B29C41/08B29C41/46C11D3/3723C11D3/386C11D3/50C11D11/0082C11D2111/12

Abstract

Claims (44)

1 . A method for manufacturing a water-soluble laundry detergent sheet, the method comprising the steps:

(i) providing an aqueous liquid composition comprising the following components:

(a) at least one pro-fragrance compound and/or zinc diricinoleate,

(b) at least one surfactant,

(c) at least one water-soluble polymer,

(d) optionally at least one washing booster,

(e) optionally at least one perfume component, and

(f) optionally at least one adjunct detergent ingredient;

(ii) applying the composition of step (i) onto a heated surface such that it forms a layer on said surface, said surface moving in a rising direction;

(iii) draining excess composition from the surface in a direction opposite the rising direction;

(iv) drying said layer at a temperature of 70° C. to 90° C. for a period of 1 to 60 seconds to obtain a laundry detergent sheet containing up to 5 wt. % of water based on the total weight; and

(v) optionally cutting the laundry detergent sheet into pieces of a desired shape and size; and

(vi) optionally packaging one or more laundry detergent sheets obtained in step (v);

wherein the at least one perfume component is in amounts from 0.01 to 20 wt.-% based on the total weight of the composition;

wherein the at least one pro-fragrance compound is selected from the group consisting of silicic acid fragrance derivatives, oxazolidine derivatives of fragrances, β-thio carbonyl pro-fragrances and mixtures thereof and is contained in the composition in amounts from 0.001 to 10 wt.-% based on the total weight of the composition; and

where zinc diricinoleate, if present, is in amounts from 0.001 to 20 wt.-% based on the total weight of the composition.

2 . The method according to claim 1 , wherein

(1) the at least one surfactant is selected from the group consisting of anionic, cationic, non-ionic, and amphoteric surfactants; and/or

(2) the at least one surfactant is contained in the composition in amounts from 10 to 90 wt.-% based on the total weight of the composition.

3 . The method according to claim 1 , wherein

(1) the at least one water-soluble polymer is selected from the group consisting of polyvinyl alcohol (PVA), polyethylene glycol (PEG), starch, cellulose, pullulan, xanthan, guar, carrageenan, polyacrylate, and gelatin; and/or

(2) the at least one water-soluble polymer is contained in the composition in amounts from 1 to 80 wt.-% based on the total weight of the composition.

4 . The method according to claim 3 , wherein the at least one water-soluble polymer is polyvinyl alcohol and starch.

5 . The method according to claim 1 , wherein

(1) the at least one washing booster is selected from the group consisting of enzymes and polyalkyleneimines; or

(2) the at least one washing booster comprises at least one enzyme, or

(3) the at least one washing booster comprises at least one polyalkyleneimine.

6 . The washing booster according to claim 5 , comprises at least one polyethyleneimine or alkoxylated variant thereof.

7 . The washing booster according to claim 5 , comprises at least one polyethyleneimine or alkoxylated variant thereof contained in the composition in amounts of from 0.01 to 40 wt.-% based on the total weight of the composition.

8 . The method according to claim 1 , wherein

(1) the at least one adjunct detergent ingredient is selected from the group consisting of: bleaches; bleach activators; polymeric carboxylates; suds suppressing systems; fluorescent whitening agents; photobleaches; fabric-softening agents; flocculants; dye transfer inhibitors; fabric integrity components; soil dispersants and soil anti-redeposition aids; anti-redeposition components; sulphamic acid or salts thereof; citric acid or salts thereof as well as other organic builders; inorganic builders; dyes; further complexing agents; sodium sulfate; enzyme stabilizers; mineral oil; organic solvents; antibacterial and antimicrobial substances; antioxidants; preservatives; bittering agents; and water; and/or

(2) the at least one adjunct detergent ingredient is contained in the composition in amounts from 0.01 to 50 wt.-% based on the total weight of the composition.

9 . The method according to claim 1 , wherein said applying step (ii) is carried out via extrusion or spraying.

10 . The method according to claim 9 , wherein said movable surface is a conveyor, wherein said rising portion of said conveyor is curved or non-curved, or

wherein said movable surface is a cylinder rotatable about a horizontal axis with said rising portion on one side and a descending portion on the other side.

11 . The method according to claim 1 , wherein the laundry detergent sheet obtained in step (iii)

(1) is dissolvable in a washing process; and/or

(2) has dimensions of 5 cm×5 cm to 40 cm×40 cm; and/or

(3) has a total weight from 0.1 to 90 g; and/or

(4) has a thickness of 0.1 to 2.5 mm.

12 . The washing process according to claim 11 , wherein the laundry detergent sheet is dissolvable in 0.1 seconds to 60 minutes.

13 . A laundry detergent sheet obtainable by the method according to claim 1 .

14 . A method for cleaning textiles, comprising contacting the textiles with the laundry detergent sheet according to claim 13 .

15 . The method according to claim 1 , wherein the aqueous liquid composition is homogenous.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (18)