Water-soluble unit dose article containing a core/shell capsule

1. A water-soluble unit dose article, wherein the water-soluble unit dose article comprises a water-soluble polyvinyl alcohol film and a laundry detergent composition, wherein the water-soluble film encloses the laundry detergent composition, wherein the laundry detergent composition comprises capsules, wherein the capsules have a core and a shell and wherein the shell surrounds the core;

wherein the core comprises a hydrophobic material;

wherein the shell comprises (a) a first shell component comprising a condensed layer and a nanoparticle layer, where the condensed layer comprises a condensation product of a precursor, and where the nanoparticle layer comprises inorganic nanoparticles, and where the condensed layer is disposed between the core and the nanoparticle layer, and (b) a second shell component surrounding the first shell component, where the second shell component surrounds the nanoparticle layer;

wherein the shell comprises between about 90% and about 100%, by weight of the shell of an inorganic material; and

wherein the capsules have a fracture strength between 1 MPa and 10 MPa.

2. A water-soluble unit dose article according to claim 1 , wherein the hydrophobic material comprises at least one perfume raw material.

3. A water-soluble unit dose article according to claim 1 wherein the inorganic material in the shell comprises a material selected from metal oxide, semi-metal oxides, metals, minerals or mixtures thereof.

4. A water-soluble unit dose article according to claim 3 , wherein the inorganic material in the shell comprises a material selected from SiO 2 , TiO 2 , Al 2 O 3 , ZrO 2 , ZnO 2 , CaCO 3 , Ca 2 SiO 4 , Fe 2 O 3 , Fe 3 O 4 , clay, gold, silver, iron, nickel, copper or a mixture thereof.

5. A water-soluble unit dose article according to claim 1 , wherein the capsules are characterized by one or more of the following:

(a) a mean volume weighted capsule diameter of about 10 μm to about 200 μm;

(b) an average shell thickness of about 170 nm to about 1000 nm;

(c) a volumetric core/shell ratio of from about 50:50 to about 99:1;

(d) the first shell component comprises no more than about 5 wt %, of organic content, by weight of the first shell component; or

(e) a mixture thereof.

6. A water-soluble unit dose article according to claim 1 wherein the precursor comprises at least one compound selected from the group consisting of Formula (I), Formula (II), or a mixture thereof,

wherein Formula (I) is (M v O z Y n ) w ,

wherein Formula (II) is (M v O z Y n R 1 p ) w ,

wherein for Formula (I), Formula (II), or the mixture thereof:

each M is independently selected from the group consisting of silicon, titanium, and aluminum,

v is the valence number of M and is about 3 or about 4,

z is from about 0.5 to about 1.6,

each Y is independently selected from —OH, —OR 2 , halogen,

—NH 2 , —NHR 2 , —N(R 2 ) 2 , and

wherein R 2 is a C 1 to C 20 alkyl, C 1 to C 20 alkylene, C 6 to C 22 aryl, or a 5-12 membered heteroaryl, wherein the heteroaryl comprises from 1 to 3 ring heteroatoms selected from O, N, and S;

wherein R 3 is a H, C 1 to C 20 alkyl, C 1 to C 20 alkylene, C 6 to C 22 aryl, or a 5-12 membered heteroaryl, wherein the heteroaryl comprises from 1 to 3 ring heteroatoms selected from O, N, and S;

w is from about 2 to about 2000;

wherein for Formula (I), n is from 0.7 to (v−1); and

wherein for Formula (II), n is from 0 to (v−1);

each R 1 is independently selected from the group consisting of: a C 1 to C 30 alkyl; a C 1 to C 30 alkylene; a C 1 to C 30 alkyl substituted with a member selected from the group consisting of a halogen, —OCF 3 , —NO 2 , —CN, —NC, —OH, —OCN, —NCO, alkoxy, epoxy, amino, mercapto, acryloyl, —CO 2 H, —C(O)-alkyl, —C(O)O-aryl, and —C(O)O-heteroaryl; and a C 1 to C 30 alkylene substituted with a member selected from the group consisting of a halogen, —OCF 3 , —NO 2 , —CN, —NC, —OH, —OCN, —NCO, alkoxy, epoxy, amino, mercapto, acryloyl, —C(O)OH, —C(O)O-alkyl, —C(O)O-aryl, and —C(O)O-heteroaryl; and

p is a number that is greater than zero and is up to pmax,

wherein pmax=60/[9*Mw(R 1 )+8],

wherein Mw(R 1 ) is the molecular weight of the R 1 group.

7. A water-soluble unit dose article according to claim 6 wherein the precursor comprises either;

a. at least one compound according to Formula (I); or

b. at least one compound according to Formula (II).

8. A water-soluble unit dose article according to claim 6 wherein one of the compounds of Formula (I), Formula (II), or both are characterized by one or more of the following:

(a) a Polystyrene equivalent Weight Average Molecular Weight (Mw) of from about 700 Da to about 30,000 Da;

(b) a degree of branching of about 0.2 to about 0.6;

(c) a molecular weight polydispersity index of about 1 to about 20; or

(d) a mixture thereof.

9. A water-soluble unit dose article according to claim 6 , wherein for Formula (I), Formula (II), or both, M is silicon.

10. A water-soluble unit dose article according to claim 6 , wherein for Formula (I), Formula (II), or both, Y is OR, wherein R is selected from a methyl group, an ethyl group, a propyl group, or a butyl group.

11. A water-soluble unit dose article according to claim 1 , wherein the inorganic nanoparticles of the first shell component comprise at least one of metal nanoparticles, mineral nanoparticles, metal-oxide nanoparticles or semi-metal oxide nanoparticles or a mixture thereof.

12. A water-soluble unit dose article according to claim 11 , wherein the inorganic nanoparticles comprise one or more materials selected from the group consisting of SiO 2 , TiO 2 , Al 2 O 3 , Fe 2 O 3 , Fe 3 O 4 , CaCO 3 , clay, silver, gold, copper or a mixture thereof.

13. A water-soluble unit dose article according to claim 1 , wherein the second shell component comprises at least one of SiO 2 , TiO 2 , Al 2 O 3 , CaCO 3 , Ca 2 SiO 4 , Fe 2 O 3 , Fe 3 O 4 , iron, silver, nickel, gold, copper, clay, or a mixture thereof.

14. A water-soluble unit dose article according to claim 1 , wherein the laundry detergent composition comprises the capsules in an amount from about 0.05% to about 20% by weight of the laundry detergent composition.

15. A water-soluble unit dose article according to claim 1 , wherein the laundry detergent composition is a liquid laundry detergent composition comprising between about 1% and about 20%, by weight of the liquid laundry detergent composition of water.

16. A water-soluble unit dose article according to claim 1 , wherein the laundry detergent composition comprises non-encapsulated perfume.

17. A water-soluble unit dose article according to claim 1 wherein the water-soluble film comprises a polyvinylalcohol homopolymer, a polyvinylalcohol copolymer, or a blend thereof.

18. A water-soluble unit dose article according to claim 17 , wherein the water-soluble film comprises a blend of polyvinylalcohol homopolymers and/or anionic polyvinylalcohol copolymers.

19. A water-soluble unit dose article according to claim 18 , wherein the water-soluble film wherein the water-soluble film comprises a blend of a polyvinylalcohol homopolymer and a carboxylated anionic polyvinylalcohol copolymer.