Detergent single dose packs and methods of producing the same

1. A multi-chamber single dose pack comprising:

a container composed of a water-soluble film, and wherein the container comprises two or more separate chambers;

a buffering agent encapsulated within at least a first chamber of the two or more separate chambers; and

a wash composition encapsulated within at least a second chamber of the two or more separate chambers, wherein the wash composition comprises:

a detergent surfactant;

water present in an amount of up to about 80 weight percent, based on the total weight of the wash composition;

a water activity-reducing salt, carbohydrate, or non-aqueous solvent; and

an organic or inorganic acid-based preservative, provided in either acid form or in salt-of-acid form,

wherein the wash composition has a water activity of about 0.1 to about 0.9 wherein the organic or inorganic acid-based preservative is in an amount sufficient to make the wash composition to have a pH of about 3.5 to about 5.5 and;

wherein the buffering agent and the wash composition are provided in two chambers separated by a common film wall;

wherein the common film wall is made of a material that is more prone to dissolution than a material which is used to construct an outer film of the single dose pack, such that when immersed in a wash water, the common film wall dissolves first, mixing the buffering agent and the wash composition first, before the outside film dissolves;

wherein the mixing the buffering agent and the wash composition causes the pH of the wash composition to increase to a neutral pH before dissolving into wash water.

2. The multi-chamber single dose pack of claim 1 , wherein the organic or inorganic acid-based preservative is selected from the group consisting of lactic acid, sorbic acid, benzoic acid, sodium sorbate, potassium sorbate, sodium benzoate, and potassium benzoate.

3. The multi-chamber single dose pack of claim 1 ,

wherein the organic or inorganic acid-based preservative is lactic acid.

4. The multi-chamber single dose pack of claim 1 , wherein the film seals the two or more separate chambers such that the buffering agent and the wash composition do not contact each other prior to dissolution of the film.

5. The multi-chamber single dose pack of claim 1 , wherein the water-soluble film comprises polyvinyl alcohol (PVOH).

6. The multi-chamber single dose pack of claim 1 , wherein the buffering agent is selected from the group consisting of: sodium, calcium, or potassium salts of citrate, malate, succinate, acetate, adipate, tartrate, fumarate, phosphate, lactate, and carbonate, and combinations thereof.

7. The multi-chamber single dose pack of claim 1 , wherein the buffering agent is in a powdered form or in a liquid form.

8. The multi-chamber single dose pack of claim 1 , wherein the buffering agent is present in the container in an amount of from about 1.0 gram to about 4.0 grams; and wherein the total weight of the wash composition is an amount from about 10 grams to about 40 grams.

9. The multi-chamber single dose pack of claim 1 , wherein the wash composition comprises water in an amount of about 15 to about 80 weight percent, based on the total weight of the wash composition.

10. The multi-chamber single dose pack of claim 1 , wherein the wash composition comprises water in an amount of from about 25 to about 80 weight percent, based on the total weight of the wash composition.

11. The multi-chamber single dose pack of claim 1 , wherein the wash composition is present in the container in an amount of from about 10 grams to about 40 grams.

12. The multi-chamber single dose pack of claim 1 ,

wherein the water activity-reducing salt is selected from the group consisting of: sodium, calcium, or potassium salts of citrate, malate, and lactate, and combinations thereof; or

wherein the water activity-reducing carbohydrate is selected from the group consisting of: sucrose, glucose, fructose, high fructose corn syrup (HFCS), light corn syrup, glucose syrup, and sucrose syrup, and combinations thereof; or

wherein the water activity-reducing non-aqueous solvent is selected from the group consisting of: polyethylene glycol and ethylene oxide/propylene oxide block copolymers, and combinations thereof.

13. The multi-chamber single dose pack of claim 1 , wherein the water activity-reducing salt, carbohydrate, or non-aqueous solvent is present in the wash composition in an amount of about 5 to about 25 weight percent, based on the total weight of the wash composition.

14. The multi-chamber single dose pack of claim 1 , wherein the organic or inorganic acid-based preservative is present in the wash composition in an amount of about 0.01 to about 0.50 weight percent, based on the total weight of the wash composition.

15. The multi-chamber single dose pack of claim 1 , wherein the wash composition has a water activity of about 0.6 to about 0.9, and wherein the wash composition has a pH of about 3.5 to about 4.6.

16. The multi-chamber single dose pack of claim 1 , wherein the single dose pack is configured for use in a laundry washing machine or a dishwashing machine.

17. A method of producing a multi-chamber single dose pack comprising:

providing a wash composition comprising:

(a) a detergent surfactant;

(b) water present in an amount of up to about 80 weight percent, based on the total weight of the wash composition;

(c) a water activity-reducing salt, carbohydrate, or non-aqueous solvent; and

(d) an organic or inorganic acid-based preservative, provided in either acid form or in salt-of-acid form,

wherein the wash composition has a water activity of about 0.1 to about 0.9, and wherein the organic or inorganic acid-based preservative is in an amount sufficient to make the wash composition to have a pH of about 3.5 to about 5.5;

providing a buffering agent; and

encapsulating the wash composition and the buffering agent each into one or more separate chambers of a container to form the multi-chamber single dose pack, wherein the container is composed of a water-soluble film, and wherein the wash composition and the buffering agent do not contact each other while encapsulated within the container;

wherein the two chambers encapsulating the buffering agent and the wash composition are separated by a common film wall;

wherein the common film wall is made of a material that is more prone to dissolution than a material which is used to construct an outer film of the single dose pack, such that when immersed in a wash water, the common film wall dissolves first, mixing the buffering agent and the wash composition first, before the outside film dissolves;

wherein the mixing the buffering agent and the wash composition causes the pH of the wash composition to increase to a neutral pH before dissolving into wash water.

18. The method of claim 17 ,

wherein the water activity-reducing salt is selected from the group consisting of: sodium, calcium, or potassium salts of citrate, malate, and lactate, and combinations thereof; or

wherein the water activity-reducing carbohydrate is selected from the group consisting of: sucrose, glucose, fructose, high fructose corn syrup (HFCS), light corn syrup, glucose syrup, and sucrose syrup, and combinations thereof; or

wherein the water activity-reducing non-aqueous solvent is selected from the group consisting of: polyethylene glycol and ethylene oxide/propylene oxide block copolymers, and combinations thereof.

19. The method of claim 17 ,

wherein the organic or inorganic acid-based preservative comprises lactic acid; or

wherein the buffering agent is selected from the group consisting of: sodium, calcium, or potassium salts of citrate, malate, succinate, acetate, adipate, tartrate, fumarate, phosphate, lactate, and carbonate, and combinations thereof.