Granted Patent B2

US 12,606,780 · App. 17/234,722 · Granted Apr 21, 2026

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

Assignee: Henkel AG & Co. KGaA

C11D17/06C11D1/29C11D1/72C11D3/222C11D3/3723C11D3/3753C11D3/3769C11D3/386C11D3/50C11D11/0082C11D2111/12

Abstract

Claims (51)

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

providing a liquid composition comprising:

at least one acrylamide polymer present in an amount of from 0.1 to 20 wt. %, based on the total weight of the liquid composition;

at least one surfactant that is different from the at least one acrylamide polymer;

at least one water-soluble polymer that is different from the at least one acrylamide polymer; and

at least one washing booster that is different from the at least one acrylamide polymer;

moving at least a portion of a heated surface in a first direction relative to the liquid composition to form a layer of the liquid composition on the heated surface;

draining any excess amount of the liquid composition from the heated surface in a second direction that is opposite to the first direction;

drying the layer at a temperature of from 70° C. to 90° C. for a time period of from 1 second to 60 seconds to obtain a laundry detergent sheet;

cutting the laundry detergent sheet into one or more pieces of a predetermined shape and size suitable for use as a unit dose; and

packaging the one or more laundry detergent sheet pieces, wherein:

the at least one acrylamide polymer is selected from the group consisting of 2-propionic acid polymer with 2-propenamide, minimum number average molecular weight (in amu) 18,000 or N,N-dimethyl-N-2-propenyl-2-propene-1-aminium chloride (dimethyl diallyl ammonium chloride), 2-propenamide polymer with N,N,N-trimethyl-3-[(1-oxo-2-propenyl) amino]-1-propanaminium chloride ((3-acrylamidopropyl)trimethylammonium chloride), and a polymer with sodium 2-propenoate, and

the laundry detergent sheet has a mass per unit area of from 40 to 200 g/m 2 , determined according to ISO 9073-1.

2 . The method of claim 1 , wherein the at least one surfactant is:

(1) selected from the group consisting of anionic surfactants, cationic surfactants, non-ionic surfactants, amphoteric surfactants, and any combination thereof; and/or

(2) in an amount of from 10 to 90 wt. % based on the total weight of the liquid composition.

3 . The method of claim 1 , wherein the at least one water-soluble polymer is:

(1) selected from the group consisting of polyvinyl alcohol (PVA), polyethylene glycol (PEG), starch, cellulose, pullulan, xanthan, guar, carrageenan, polyacrylate, gelatin, and any combination thereof; and/or

(2) present in an amount of from 1 to 80 wt. % based on the total weight of the liquid composition.

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

5 . The method of claim 1 , wherein the at least one washing booster comprises at least one enzyme, at least one polyalkyleneimine, or a combination thereof.

6 . The method of claim 5 , wherein the at least one enzyme is present in an amount from 0.0001 to 10 wt. %, based on the total weight of the liquid composition.

7 . The method of claim 5 , wherein the at least one washing booster comprises at least one polyethyleneimine or alkoxylated variant thereof.

8 . The method of claim 7 , wherein the at least one washing booster is present in an amount of from 0.01 to 40 wt. %, based on the total weight of the liquid composition.

9 . The method of claim 1 , wherein the liquid composition further comprises at least one perfume component present in an amount of from 0.01 to 20 wt. %, based on the total weight of the liquid composition.

10 . The method of claim 1 , wherein the liquid composition further comprises at least one adjunct detergent ingredient that is:

(1) 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, soil anti-redeposition aids, anti-redeposition components, sulphamic acid or salts thereof, citric acid or salts thereof, organic builders, inorganic builders, dyes, complexing agents, sodium sulfate, enzyme stabilizers, mineral oil, organic solvents, antibacterial substances, antimicrobial substances, antioxidants, preservatives, bittering agents, water, and any combination thereof; and/or

(2) in an amount of from 0.01 to 50 wt. %, based on the total weight of the liquid composition.

11 . The method of claim 1 , wherein the laundry detergent sheet comprises up to 10 wt. % of water, based on the total weight of the laundry detergent sheet.

12 . The method of claim 1 , wherein the laundry detergent sheet:

is dissolvable in a washing process;

has dimensions of from 5 cm×5 cm to 40 cm×40 cm;

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

has a thickness of from 0.1 to 2.5 mm.

13 . The method of claim 1 , wherein: the at least portion of the heated surface is curved or non-curved.

14 . The method of claim 1 , wherein the laundry detergent sheet has a mass per unit area of from 60 to 75 g/m 2 , determined according to ISO 9073-1.

15 . The method of claim 1 , wherein the layer is dried at a temperature of from 75° C. to 85° C.

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

providing a liquid composition comprising:

at least one acrylamide polymer that is 2-propenamide polymer with N,N,N-trimethyl-3-[(1-oxo-2-propenyl) amino]-1-propanaminium chloride ((3-acrylamidopropyl)trimethylammonium chloride) in an amount of from 0.1 to 20 wt. %, based on the total weight of the liquid composition;

at least one surfactant selected from the group consisting of alkyl benzene sulfonates, alkyl ether sulfates, C 8 -18 alkyl alkyloxylated alcohols, and any combination thereof;

at least one water-soluble polymer comprising polyvinyl alcohol and starch; and

at least one washing booster selected from the group consisting of mannase, xanthanase, licheninase, an ethoxylated polyethyleneimine, and any combination thereof;

moving at least a portion of a heated surface in a first direction relative to the liquid composition to form a layer of the liquid composition on the heated surface;

draining any excess amount of the liquid composition from the heated surface in a second direction that is opposite to the first direction;

drying the layer at a temperature of from 70° C. to 90° C. for a time period of from 1 second to 60 seconds to obtain a laundry detergent sheet;

cutting the laundry detergent sheet into one or more pieces of a predetermined shape and size suitable for use as a unit dose; and

packaging the one or more laundry detergent sheet pieces,

wherein the laundry detergent sheet has a mass per unit area of from 40 to 200 g/m 2 , determined according to ISO 9073-1.

17 . The method of claim 16 , wherein the laundry detergent sheet has a mass per unit area of from 60 to 75 g/m 2 , determined according to ISO 9073-1.

18 . The method of claim 16 , wherein the layer is dried at a temperature of from 75° C. to 85° C.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (22)