Water-soluble unit dose article

1. A water-soluble unit dose article comprising a liquid laundry detergent composition and a water-soluble film;

wherein the liquid laundry detergent composition comprises a first anionic surfactant, wherein said first anionic surfactant comprises a mixture of surfactant isomers according to Formula I and surfactant isomers according to Formula II:

wherein m is between 4 and 9, and n is between 0 and 5, and

wherein about 90% to about 100% by weight of the first anionic surfactant are isomers having m+n equal to 9; and

wherein between about 25% and about 50% by weight of the mixture of surfactant isomers of Formula I have n=0; and

wherein from about 0.001% to about 25%, by weight of the first anionic surfactant are surfactants according to Formula II; and

wherein X is sulfate.

2. The water-soluble unit dose article according to claim 1 , wherein the water-soluble unit dose article comprises between about 1% and about 20% by weight of the water-soluble unit dose article of the first anionic surfactant.

3. The water-soluble unit dose article according to claim 2 , wherein the water-soluble unit dose article comprises between about 2% and about 10% by weight of the water-soluble unit dose article of the first anionic surfactant.

4. The water-soluble unit dose article according to claim 1 , wherein about 15% to about 40% of the mixture of surfactant isomers of Formula I have n=1.

5. The water-soluble unit dose article according to claim 1 , wherein about 60% to about 90% of the mixture of surfactant isomers of Formula I have n<3.

6. The water-soluble unit dose article according to claim 1 , wherein from about 5% to about 20% by weight of the first anionic surfactant mixture are isomers of Formula I with n=2.

7. The water-soluble unit dose article according to claim 1 , wherein up to about 40% of the mixture of surfactant isomers of Formula I have 5≥n>2.

8. The water-soluble unit dose article according to claim 1 wherein the water-soluble film comprises a polyvinylalcohol homopolymer or a polyvinylalcohol copolymer or a mixture thereof.

9. The water-soluble unit dose article according to claim 1 , wherein the liquid laundry detergent composition comprises a further surfactant selected from a second anionic surfactant, a non-ionic surfactant or a mixture thereof.

10. The water-soluble unit dose article according to claim 9 , wherein the liquid laundry detergent composition comprises a second anionic surfactant, wherein the second anionic surfactant is selected from an alkoxylated alkyl sulphate anionic surfactant, a linear alkylbenzene sulphonate, or a mixture thereof.

11. The water-soluble unit dose article according to claim 10 , wherein the linear alkylbenzene sulphonate comprises C 10 -C 16 alkyl benzene sulfonate, C 11 -C 14 alkyl benzene sulphonate, or a mixture thereof.

12. The water-soluble unit dose article according to claim 10 wherein the liquid laundry detergent composition comprises an alkoxylated alcohol, wherein the alkoxylated alcohol is derived from a synthetical alcohol, a natural alcohol or a mixture thereof.

13. The water-soluble unit dose article according to claim 9 , wherein the liquid laundry detergent composition comprises between about 20% and about 60%, by weight of the liquid laundry detergent composition of the first anionic surfactant, the second anionic surfactant and the non-ionic surfactant.

14. The water-soluble unit dose article according to claim 9 , wherein the ratio of the first anionic surfactant and the second anionic surfactant to the non-ionic surfactant is from about 1:1 to about 20:1.

15. The water-soluble unit dose article according to claim 1 wherein the liquid laundry detergent composition comprises between about 1% and about 15%, by weight of the liquid laundry detergent composition of water.

16. The water-soluble unit dose article according to claim 1 wherein the liquid laundry detergent composition further comprises an amphoteric surfactant.