Laundry articles
View Patent ↗An article comprising a first pouch made of a water-soluble material containing a first solid and/or liquid composition and a second pouch made of a water-soluble material containing a second solid and/or liquid composition characterized in that at least one of the first and second pouches is made from a material which remains substantially intact when immersed in water under a first set of conditions but will readily dissolve or disintegrate when immersed in water under a second set of conditions.
1. A kit comprising:
an article including a first pouch and a second pouch each made of a flexible polymeric film that is water-soluble under appropriate conditions, the first pouch containing a first solid and/or liquid composition, and the second pouch containing a second solid and/or liquid composition; and
an activator material, wherein the activator material is at least one of an acid, a ligand and an enzyme, wherein the polymeric film of the first pouch is more soluble in water in the presence of an activator material than the polymeric film of the first pouch would be in the absence of the activator material,
wherein the polymeric film of the first pouch remains substantially intact when immersed in water under a first set of conditions but will readily dissolve or disintegrate when immersed in water under a second set of conditions,
wherein the polymeric film of the second pouch will readily dissolve or disintegrate in water under the first set of conditions,
wherein the first set of conditions is the absence of the activator material in water at an early stage in a rinse cycle in a wash process, and the second set of conditions is the presence of the activator material in water at a later stage of the rinse cycle in the wash process, and
wherein the activator material is separate and discrete from the article comprising the first and second pouches.
2. A kit as claimed in claim 1 , wherein the wash process is a laundry process, and wherein the first set of conditions is the absence of the activator material in water at the early stage of the rinse cycle of the laundry process, and the second set of conditions is the presence of the activator material in water at the later stage of the rinse cycle, and wherein the activator material is formulated so as to change the ionic strength of rinse water in the rinse cycle of the laundry process such that the polymeric film of the first pouch is more soluble in the rinse water in the presence of the activator material than the polymeric film of the first pouch would be in the absence of the activator material.
3. A kit as claimed in claim 1 , wherein the polymeric film of the first pouch is insoluble in water in the presence of anionic surfactant but soluble in water in the absence of anionic surfactant.
4. A kit as claimed in claim 1 , wherein the wash process is a laundry process, and wherein the first set of conditions is the absence of the activator material in water at the early stage of the rinse cycle of the laundry process, and the second set of conditions is the presence of the activator material in water at the later stage of the rinse cycle, and wherein the polymeric film of the first pouch is insoluble in water at high pH and soluble in water at low pH, and wherein the activator material is an acid which reduces the pH of rinse water in the rinse cycle of the laundry process and accentuates the pH drop from a wash cycle to the rinse cycle of the laundry process so as to accelerate disintegration of the polymeric film of the first pouch in the rinse water.
5. A kit as claimed in claim 1 , wherein the polymeric film of the first pouch is insoluble in water in absence of the activator material and soluble in water in the presence of the activator material.
6. A kit as claimed in claim 1 in which the first pouch is positioned within the second pouch.
7. A kit as claimed in claim 1 , wherein the polymeric film of the second pouch is made of polyvinyl alcohol film.
8. A kit as claimed in claim 1 , wherein the polymeric film of the first pouch comprises a polyvinyl alcohol film.
9. A kit as claimed in claim 1 , wherein a protective layer made of polytetrafluoroethylene (PTFE) is disposed between the polymeric film of at least one of the first and second pouches and the respective first and second compositions contained therein.
10. A kit as claimed in claim 1 , wherein the activator material is at least one enzyme selected from the group consisting of lipase BCC, Nitrilase enzymes, and enzymes isolated from Rhodococcus sp ., and wherein, when the polymeric film of the first pouch is in the presence of the enzyme, the enzyme transforms functional groups on the polymeric film of the first pouch by hydrolysis, oxidation and/or reduction thereby rendering the polymeric film of the first pouch soluble in water.
11. A kit as claimed in claim 1 , wherein the activator material is a solid material comprising a ligand selected from the group consisting of 1,2-ethanediol, glycolic acid, lactic acid, sucrose, poly(vinylalcohol), oxalic acid, glycerol, citric acid, and combinations thereof, wherein the ligand is in an amount from 0.5 to 40% by weight of the total weight of the activator, and wherein, when the polymeric film of the first pouch is in the presence of the ligand, the ligand bonds with functional groups on the polymeric film of the first pouch thereby causing the polymeric film of the first pouch to become soluble in water.
12. A kit as claimed in claim 1 , wherein the activator material comprises an acid selected from the group consisting of sodium hydrogen sulphate, hydroxycitric acid, sodium hydrogen carbonate, potassium hydrogen tartrate, potassium dihydrogen citrate, sodium hydrogen diglyconate, hydrochloric acid, methane sulphonic acid, toluene sulphonic acid, potassium tetroxalate and short chain organic acids such as propionic and acetic acid.
13. A kit as claimed in claim 1 , wherein the wash process is a laundry process, and wherein the first set of conditions is the absence of the activator material in water at the early stage of the rinse cycle of the laundry process, and the second set of conditions is the presence of the activator material in water at the later stage of the rinse cycle, and wherein the second composition contained the second pouch comprises a fabric conditioning composition and the first composition contained in the first pouch comprises a perfume or a super-wetter.
14. A method of treating fabrics in a washing machine laundry treatment process comprising:
dosing the article of the kit of claim 1 into a washing machine drum before a machine cycle commences; and
operating the machine to provide the machine cycle including a wash cycle followed by a rinse cycle so that the second composition contained in the second pouch is released at an early stage in the rinse cycle and the first composition contained in the first pouch is released at a later stage of the rinse cycle in the machine cycle.
15. A method of treating fabrics in a washing machine laundry treatment process comprising:
placing the article of the kit of claim 1 into a washing machine drum before the wash cycle commences,
dosing the activator material into a rinse compartment of the dispensing drawer of the washing machine before the rinse cycle commences, and
operating the machine to provide a wash cycle followed by a rinse cycle so that the activator material is transferred from the dispensing drawer to the drum during the rinse cycle,
wherein the polymeric film of the second pouch dissolves during the rinse cycle to release the second composition therein and the polymeric film of the first pouch dissolves at a later stage during the rinse cycle in the presence of the activator material to release the first composition therein.