Water-soluble unit dose article including water-soluble core construction
A single unit dose article includes a water-soluble core substrate comprising a water-soluble resin. The water-soluble core substrate contains a carrier solvent with an active cleaning formulation, wherein upon contact of the carrier solvent with the water-soluble core substrate, the water-soluble core substrate exhibits shrinkage or swelling. Also disclosed are methods of making the single unit dose article.
1 . A single unit dose article, comprising:
a water-soluble material comprising a plurality of fibers including a water-soluble resin, the water-soluble material bonded at a bonding interface along an edge of the water-soluble material to define an interior volume of the single unit dose article; and
a single layer of a water-soluble film substrate and carrier solvent with an active cleaning formulation in a solid phase adhered, adsorbed or bound to a surface of the water-soluble film substrate and disposed in the interior volume, wherein, when the water-soluble material is contacted with water having a temperature greater than 10° C., the water-soluble material is soluble according to MSTM-205 to release the active cleaning formulation from the interior volume.
2 . The single unit dose article according to claim 1 , wherein upon contact of the carrier solvent with at least one fiber of the plurality of fibers, the at least one fiber exhibits a degree of shrinkage of 0.5% to 65%.
3 . The single unit dose article according to claim 1 , wherein the water-soluble material comprises a water-soluble nonwoven web.
4 . The single unit dose article according to claim 1 , wherein the active cleaning formulation in a solid phase is in the form of powder or granules.
5 . The single unit dose article according to claim 1 , wherein the water-soluble material has a first surface facing the interior volume and an opposing second surface, the single unit dose article further comprising a water-soluble film disposed on the first surface.
6 . The single unit dose article according to claim 1 , wherein the water-soluble material includes a water-soluble composite material comprising a water-soluble film material made of a first water-soluble resin coupled to one of a water-soluble nonwoven material or a water-soluble foam material made of a second water-soluble resin.
7 . The single unit dose article according to claim 1 , wherein the water-soluble resin is a polyvinyl alcohol homopolymer, a polyvinyl alcohol copolymer, or a combination thereof.
8 . The single unit dose article according to claim 7 , wherein the polyvinyl alcohol copolymer is a copolymer of vinyl acetate and vinyl alcohol or an anionically modified copolymer of vinyl acetate and vinyl alcohol.
9 . The single unit dose article according to claim 1 , wherein the plurality of fibers comprise a first type of fiber comprising a polyvinyl alcohol copolymer having a degree of hydrolysis in a range of about 75% to about 89%, and a second type of fiber comprising a polyvinyl alcohol copolymer having a degree of hydrolysis in a range of about 90% to about 99.5%.
10 . The single unit dose article according to claim 9 , wherein a ratio of the first type of fiber to the second type of fiber is in a range of from about I: 99 to about 75:25 by weight.