Personal Care Pod

Abstract

A personal care pod is provided, the personal care pod comprising a self-supporting film, the self-supporting film comprising 20-100% by weight of a crosslinked cellulose ether, the crosslinked cellulose ether containing 0.1-0.6% by weight of a polyether group, based on the weight of the crosslinked cellulose ether, and a personal care formulation, the self-supporting film forming a cavity, the personal care formulation disposed within the cavity, the personal care formulation in contact with the self-supporting film, and the self-supporting film encapsulating the personal care formulation. Methods of using the personal care pod are also provided.

Description

[Technical field]

[0001] The present invention relates to a personal care pod. Specifically, the present invention relates to a personal care pod, comprising a self-supporting film, the self-supporting film comprising 20-100% by weight of crosslinked cellulose ether based on the weight of the self-supporting film, the crosslinked cellulose ether containing 0.1-0.6% by weight of polyether group based on the weight of the crosslinked cellulose ether, and a personal care formulation, the self-supporting film forms a cavity, the personal care formulation is disposed in the cavity, the personal care formulation is in contact with the self-supporting film, and the self-supporting film encapsulates the personal care formulation.

[0002] Personal care products (e.g., shampoos, body washes, hair conditioners, shaving creams) are typically sold to consumers in the form of liquids or gels. These personal care products generally contain active ingredients (e.g., surfactants, conditioners) in combination with a significant amount of water. These personal care products are also typically commercially provided to consumers in containers with enough product for multiple uses. While such personal care product forms are suitable for many consumer applications, there remains a need for single-use forms (e.g., for use in the travel and hospitality industry) and multi-use concentrated forms that allow consumers to form use-strength personal care formulations through the addition of water, especially forms that allow personal care active ingredients to be packaged and shipped separately from the majority of the water used to make the personal care formulation.

[0003] For use in the hospitality / travel industry, personal care products have been provided in small plastic bottles, however, these formats result in undesirably high packaging-to-product ratios, leading to higher costs and increased waste.

[0004] In U.S. Patent No. 11,045,397, Stern et al. disclose a hygiene product pod and a method of using the same. Specifically, Stern et al. disclose a hygiene product pod comprising a water-soluble envelope and an emulsified liquid hygiene product sealed within the envelope, the hygiene product comprising a surfactant in an amount of about 10% to about 40% by weight based on the total weight of the hygiene product, a first polyol in an amount of about 10% to about 30% by weight based on the total weight of the hygiene product, the first polyol comprising propylene glycol in an amount of about 10% to about 20% by weight based on the total weight of the hygiene product, glycerin in an amount of about 1% to about 10% by weight, and optionally less than 6% by weight of glycerin. the amount of dipropylene glycol in an amount of less than 5% by weight, hexylene glycol in an amount of less than 5% by weight, a second polyol in an amount ranging from about 10% to about 50% by weight, the second polyol being at least one polyglyceryl fatty acid ester (PGE) selected from the group consisting of polyglyceryl-2 caprate, polyglyceryl-3 caprate, polyglyceryl-3 laurate, and polyglyceryl-6 ester, and a liquid amide in an amount ranging from about 5% to about 40% by weight, and having a free water content of about 9% or less by weight.

[0005] One problem with conventionally packaged concentrates is that personal care formulations formed with the concentrates have inadequate viscosity, given the difficulty of stably formulating conventional rheology modifiers into concentrated formulations incorporated into the package. The lack of viscosity in compositions formed from pods can be viewed negatively by consumers and can adversely hinder the performance of, for example, shampoo and body wash formulations where rheology may be required.

[0006] Thus, there remains a need for a packaged personal care pod for preparing a personal care product, where the formed personal care product has an improved viscosity. In particular, there remains a need for a self-supporting film composition that can provide a thickening effect to the personal care formulation formed by the personal care pod made with such a self-supporting film composition.

[0007] The present invention provides a personal care pod comprising a self-supporting film, the self-supporting film comprising 20-100% by weight of crosslinked cellulose ether, based on the weight of the self-supporting film, the crosslinked cellulose ether containing 0.1-0.6% by weight of polyether groups, based on the weight of the crosslinked cellulose ether; and a personal care formulation, wherein the self-supporting film forms a cavity, the personal care formulation is disposed within the cavity, the personal care formulation is in contact with the self-supporting film, and the self-supporting film encapsulates the personal care formulation.

[0008] The present invention provides a personal care pod comprising a self-supporting film, the self-supporting film comprising 20-100% by weight of crosslinked cellulose ether, based on the weight of the self-supporting film, the crosslinked cellulose ether containing 0.1-0.6% by weight of polyether groups, based on the weight of the crosslinked cellulose ether; and a personal care formulation, wherein the self-supporting film has an average thickness of 5-200 μm, the self-supporting film forms a cavity, the personal care formulation is disposed in the cavity, the personal care formulation is in contact with the self-supporting film, and the self-supporting film encapsulates the personal care formulation.

[0009] The present invention provides a personal care pod comprising a free-standing film comprising 20-100% by weight of crosslinked cellulose ether based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1-0.6% by weight of polyether groups based on the weight of the crosslinked cellulose ether; and a personal care formulation, wherein the crosslinked cellulose ether is an irreversibly crosslinked cellulose ether, the free-standing film forms a cavity, the personal care formulation is disposed within the cavity, the personal care formulation is in contact with the free-standing film, and the free-standing film encapsulates the personal care formulation.

[0010] The present invention provides a personal care pod comprising: a self-supporting film comprising 20-100% by weight of crosslinked cellulose ether based on the weight of the self-supporting film, the crosslinked cellulose ether containing 0.1-0.6% by weight of a polyether group based on the weight of the crosslinked cellulose ether; and a personal care formulation, wherein the crosslinked cellulose ether is an irreversibly crosslinked cellulose ether, the polyether group in the irreversibly crosslinked cellulose ether is a polyoxyalkylene group having 2-100 oxyalkylene groups, the self-supporting film forms a cavity, the personal care formulation is disposed in the cavity, the personal care formulation is in contact with the self-supporting film, and the self-supporting film encapsulates the personal care formulation.

[0011] The present invention relates to a method for producing a crosslinked cellulose ether comprising the steps of: (i) a self-supporting film, the crosslinked cellulose ether comprising 20 to 100% by weight, based on the weight of the self-supporting film, the crosslinked cellulose ether containing 0.1 to 0.6% by weight, based on the weight of the crosslinked cellulose ether, of a polyether group; (a) 5 to 80% by weight, based on the weight of the self-supporting film, of a partially hydrolyzed poly(vinyl acetate); (b) 0.1 to 45% by weight, based on the weight of the self-supporting film, of a crosslinking agent; (c) 0.1 to 45% by weight, based on the weight of the self-supporting film, of a poly(ethylene oxide) having a weight average molecular weight of 20,000 to 2,000,000 Daltons; (d) 0.1 to 35% by weight, based on the weight of the self-supporting film, of a poly(alkylene oxide) having a weight average molecular weight of greater than 400 to 5,300 Daltons; (e) 0.1 to 45 wt % of a plasticizer, based on the weight of the free-standing film; (f) 0.1 to 10 wt % of a poly(isobutylene-co-maleic anhydride) copolymer, based on the weight of the free-standing film, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized, and (g) 0.01 to 1.8 wt % of poly(vinylpyrrolidone), based on the weight of the free-standing film; and (ii) a personal care formulation, wherein the free-standing film forms a cavity, the personal care formulation is disposed within the cavity, the personal care formulation is in contact with the free-standing film, and the free-standing film encapsulates the personal care formulation.

[0012] The present invention provides a personal care pod comprising: (i) a free-standing film comprising 20-95 wt. % crosslinked cellulose ether, based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1-0.6 wt. % polyether groups, based on the weight of the crosslinked cellulose ether, and 5-80 wt. % partially hydrolyzed poly(vinyl acetate), based on the weight of the free-standing film; and (ii) a personal care formulation, wherein the free-standing film forms a cavity, the personal care formulation is disposed within the cavity, the personal care formulation is in contact with the free-standing film, and the free-standing film encapsulates the personal care formulation.

[0013] The present invention provides a method of using the personal care pod of the present invention, wherein the personal care pod is a single-use personal care pod, comprising applying water to the single-use personal care pod to dissolve or disperse the self-supporting film and release the personal care formulation, and applying the personal care formulation to skin or hair.

[0014] The present invention provides a method of forming a personal care formulation, the method comprising: providing a personal care pod of the present invention, wherein the personal care pod is a personal care concentrate pod, and the personal care formulation contained in the personal care concentrate pod is a personal care formulation concentrate; providing a container; adding water to the container; adding the personal care concentrate pod to the container; agitating the contents of the container; dissolving or dispersing the free-standing film of the personal care concentrate pod in the water; and mixing the water with the personal care formulation concentrate from the personal care concentrate pod to form a use strength personal care formulation in the container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present inventors have discovered a unique free-standing film that facilitates significant thickening of the end-use personal care formulation formed using a personal care pod containing the personal care formulation.

[0016] Unless otherwise indicated, ratios, percentages, parts, etc. are by weight.

[0017] As used herein, unless otherwise indicated, the term "molecular weight" or Mw refers to weight average molecular weight measured in the conventional manner using gel permeation chromatography (GPC) and polyacrylic acid standards. The technique of GPC is described in detail in Modem Size Exclusion Chromatography, WW Yau, JJ Kirkland, DDBly; Wiley-Interscience, 1979, and A Guide to Materials Characterization and Chemical Analysis, JP Sibilia; VCH, 1988, p.81-84. Molecular weights are reported herein in units of Daltons.

[0018] As used herein and in the appended claims, the term "DS" refers to the number of alkyl-substituted OH groups per anhydroglucose unit in a cellulose ether as determined by the Zeisel method.

[0019] As used herein and in the appended claims, the term "DS(methyl)" or "DS(M)" refers to the number of methyl-substituted OH groups per anhydroglucose unit in a cellulose ether, as determined by the Zeisel method.

[0020] As used herein and in the appended claims, the term "MS" refers to the number of moles of etherifying reagent bound as an ether per mole of anhydroglucose unit as a hydroxyalkyl substituent in a cellulose ether, as determined by the Zeisel method.

[0021] As used herein and in the appended claims, the term "MS(hydroxyethyl)" or "MS(HE)" refers to the number of moles of etherifying reagent bound as an ether per mole of anhydroglucose unit as a hydroxyethyl substituent in a cellulose ether, as determined by the Zeisel method.

[0022] As used herein and in the appended claims, the term "MS(hydroxypropyl)" or "MS(HP)" refers to the number of moles of etherifying reagent bound as an ether per mole of anhydroglucose unit as a hydroxypropyl substituent in a cellulose ether, as determined by the Zeisel method.

[0023] The term "Zeisel method" refers to the Zeisel cutting procedure for determining MS and DS. See G. Bartelmus and R. Ketterer, Zeitschrift für Analytische Chemie, Vol. 286 (1977, Springer, Berlin, DE), pages 161-190.

[0024] Preferably, the personal care pod of the present invention comprises: (i) a self-supporting film comprising 20 to 100% by weight (preferably at least 25% by weight, more preferably at least 40% by weight, and most preferably at least 60% by weight) (preferably 98% by weight or less, more preferably 95% by weight or less, and most preferably 90% by weight or less) of crosslinked cellulose ether based on the weight of the self-supporting film, the crosslinked cellulose ether containing 0.1 to 0.6% by weight of polyether groups based on the weight of the crosslinked cellulose ether; and (ii) a personal care formulation, wherein the self-supporting film forms a cavity, the personal care formulation is disposed in the cavity, the personal care formulation is in contact with the self-supporting film, and the self-supporting film encapsulates the personal care formulation.

[0025] Preferably, the free-standing film used in the personal care pods of the present invention comprises 20 to 100 wt. % (preferably at least 25 wt. %, more preferably at least 40 wt. %, and most preferably at least 60 wt. %) (preferably 98 wt. % or less, more preferably 95 wt. % or less, and most preferably 90 wt. %) of crosslinked cellulose ether based on the weight of the free-standing film, and includes 0.1 to 0.6 wt. % of a crosslinked cellulose ether containing polyether groups based on the weight of the crosslinked cellulose ether (preferably, the crosslinked cellulose ether is an irreversibly crosslinked cellulose ether).

[0026] Preferably, the self-supporting film used in the personal care pod of the present invention has an average thickness of 5 to 200 μm (preferably, 20 to 100 μm, more preferably, 35 to 100 μm, and most preferably, 40 to 85 μm).

[0027] Preferably, the free standing films used in the personal care pods of the present invention have a disintegration time of less than 90 seconds when measured at 40° C. using distilled water according to MSTM 205.

[0028] Preferably, the free-standing films used in the personal care pods of the present invention are water-soluble. The term "water-soluble", as used herein with respect to the free-standing films of the present invention, means that when a sample of the free-standing film (0.5" x 1.5" x 76 μm) is placed in 20 mL of tap water having a temperature of 5-25° C. in a sample vial, allowed to stand for 2 minutes, then shaken for 60 seconds, and then filtered through a 0.025 mm mesh screen, only slight haze is observed and no residue or grit is observed, following the procedures described herein in the examples.

[0029] Preferably, the free-standing films used in the personal care pods of the present invention are water soluble based on a film solubility test conducted according to MSTM (MonoSol Standard Test Method) 205 in distilled water at 25°C.

[0030] Preferably, the self-supporting film used in the personal care pod of the present invention comprises 20 to 100% by weight (preferably at least 25% by weight, more preferably at least 40% by weight, and most preferably at least 60% by weight) (preferably 98% by weight or less, more preferably 95% by weight or less, and most preferably 90% by weight or less) of a crosslinked cellulose ether based on the weight of the self-supporting film, and the crosslinked cellulose ether contains 0.1 to 0.6% by weight of a polyether group based on the weight of the crosslinked cellulose ether, the crosslinked cellulose ether comprising a base cellulose ether and a crosslinking bond, the crosslinking bond contains a polyether group, and the base cellulose ether is a mixed cellulose ether containing a hydroxyalkyl ether group and an alkyl ether group. More preferably, the free-standing film used in the personal care pods of the present invention comprises 20-100% by weight (preferably at least 25% by weight, more preferably at least 40% by weight, and most preferably at least 60% by weight) (preferably 98% by weight or less, more preferably 95% by weight or less, and most preferably 90% by weight or less) of a crosslinked cellulose ether based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1-0.6% by weight of a polyether group based on the weight of the crosslinked cellulose ether, the crosslinked cellulose ether comprising a base cellulose ether and a crosslinking bond, the crosslinking bond containing a polyether group, and the base cellulose ether is selected from the group consisting of hydroxyethyl methylcellulose, hydroxypropyl methylcellulose, methyl hydroxyethyl hydroxypropyl cellulose, ethyl hydroxyethyl cellulose, and combinations thereof.Most preferably, the free-standing film used in the personal care pods of the present invention comprises 20 to 100 wt. % (preferably at least 25 wt. %, more preferably at least 40 wt. %, and most preferably at least 60 wt. %) (preferably 98 wt. % or less, more preferably 95 wt. % or less, and most preferably 90 wt. % or less) of a crosslinked cellulose ether based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1 to 0.6 wt. % of a polyether group based on the weight of the crosslinked cellulose ether, the crosslinked cellulose ether comprising a base cellulose ether and a crosslinking bond, the crosslinking bond containing a polyether group, and the base cellulose ether is hydroxyethyl methylcellulose.

[0031] Preferably, the free-standing film used in the personal care pods of the present invention comprises 20 to 100% by weight (preferably at least 25% by weight, more preferably at least 40% by weight, and most preferably at least 60% by weight) (preferably 98% by weight or less, more preferably 95% by weight or less, and most preferably 90% by weight or less) of crosslinked cellulose ether based on the weight of the free-standing film, and includes a crosslinked cellulose ether containing 0.1 to 0.6% by weight of polyether groups based on the weight of the crosslinked cellulose ether, wherein any of the crosslinked cellulose ethers is an irreversibly crosslinked cellulose ether. More preferably, the free-standing film used in the personal care pod of the present invention comprises 20 to 100% by weight (preferably at least 25% by weight, more preferably at least 40% by weight, and most preferably at least 60% by weight) based on the weight of the free-standing film (preferably 98% by weight or less, more preferably 95% by weight or less, and most preferably 90% by weight or less) of a crosslinked cellulose ether containing 0.1 to 0.6% by weight of a polyether group based on the weight of the crosslinked cellulose ether, the crosslinked cellulose ether comprising a base cellulose ether and a crosslinking bond, the crosslinking bond containing a polyether group, the base cellulose ether being a mixed cellulose ether containing a hydroxyalkyl ether group and an alkyl ether group, and the crosslinked cellulose ether being an irreversibly crosslinked cellulose ether.Even more preferably, the free-standing film used in the personal care pod of the present invention comprises 20-100 wt. % (preferably at least 25 wt. %, more preferably at least 40 wt. %, and most preferably at least 60 wt. %) (preferably 98 wt. % or less, more preferably 95 wt. % or less, and most preferably 90 wt. % or less) of a crosslinked cellulose ether based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1-0.6 wt. % of a polyether group based on the weight of the crosslinked cellulose ether, the crosslinked cellulose ether comprising a base cellulose ether and a crosslinking bond, the crosslinking bond containing a polyether group, the base cellulose ether being selected from the group consisting of hydroxyethyl methylcellulose, hydroxypropyl methylcellulose, methyl hydroxyethyl hydroxypropyl cellulose, ethyl hydroxyethyl cellulose, and combinations thereof, and any of the crosslinked celluloses being irreversibly crosslinked cellulose ethers. Most preferably, the free-standing film used in the personal care pods of the present invention comprises 20-100% by weight (preferably at least 25% by weight, more preferably at least 40% by weight, most preferably at least 60% by weight) based on the weight of the free-standing film (preferably 98% by weight or less, more preferably 95% by weight or less, most preferably 90% by weight or less) of a crosslinked cellulose ether containing 0.1-0.6% by weight of a polyether group based on the weight of the crosslinked cellulose ether, the crosslinked cellulose ether comprising a base cellulose ether and a crosslinking bond, the crosslinking bond containing a polyether group, the base cellulose ether is hydroxyethyl methylcellulose, and both of the crosslinked celluloses are irreversibly crosslinked cellulose ethers.

[0032] Preferably, the crosslinked cellulose ether contains 0.1 to 0.6% by weight (preferably 0.12 to 0.6% by weight, more preferably 0.12 to 0.45% by weight, most preferably 0.12 to 0.29% by weight) of a polyether group based on the weight of the crosslinked cellulose ether. More preferably, the crosslinked cellulose ether contains 0.1 to 0.6% by weight (preferably 0.12 to 0.6% by weight, more preferably 0.12 to 0.45% by weight, most preferably 0.12 to 0.29% by weight) of a polyether group based on the weight of the crosslinked cellulose ether, and the polyether group is a polyoxyalkylene group having 2 to 100 (preferably 2 to 20, more preferably 3 to 15) oxyalkylene groups per crosslink. Most preferably, the crosslinked cellulose ether contains 0.1 to 0.6% by weight (preferably 0.12 to 0.6% by weight, more preferably 0.12 to 0.45% by weight, most preferably 0.12 to 0.29% by weight) of a polyether group based on the weight of the crosslinked cellulose ether, and the polyether group is a polyoxypropylene group having 2 to 100 (preferably 2 to 20, more preferably 3 to 15) oxypropylene groups per crosslink.

[0033] Preferably, the crosslinked cellulose ether comprises a base cellulose ether having a crosslinked bond containing 0.1-0.6 wt % polyether group based on the weight of the crosslinked cellulose ether. Preferably, the base cellulose ether is selected from hydroxyalkyl cellulose ethers, alkyl cellulose ethers, and combinations thereof. Examples of base cellulose ethers include, for example, methyl cellulose, ethyl cellulose, propyl cellulose, butyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, methyl ethyl hydroxyethyl cellulose, hydrophobically modified ethyl hydroxyethyl cellulose, hydrophobically modified hydroxyethyl cellulose, sulfoethyl methyl hydroxyethyl cellulose, sulfoethyl methyl hydroxypropyl cellulose, and sulfoethyl hydroxyethyl cellulose. Preferably, the base cellulose ether is a mixed cellulose ether containing both hydroxyalkyl ether groups and alkyl ether groups, such as alkyl hydroxyethyl cellulose and hydroxyalkyl methyl cellulose (e.g., hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, methyl hydroxyethyl hydroxypropyl cellulose, and ethyl hydroxyethyl cellulose).

[0034] Preferably, the base cellulose ether contains a hydroxyalkyl ether substitution. More preferably, the base cellulose ether has a degree of hydroxyethyl ether substitution MS(HE) or a degree of hydroxypropyl ether substitution MS(HP) of 1.5 to 4.5 (preferably, 2.0 to 3.0).

[0035] Preferably, the base cellulose ether contains a methyl ether substitution. More preferably, the base cellulose ether has a degree of methyl ether substitution DS(M) of 1.2 to 2.1 (preferably, 1.3 to 1.7, more preferably, 1.35 to 1.60).

[0036] Preferably, the base cellulose ether is a mixed cellulose ether containing hydroxyalkyl ether substitution and alkyl ether substitution, and more preferably, the base cellulose ether is a mixed cellulose ether having a hydroxyethyl ether substitution degree MS(HE) of 0.05 to 0.75 (preferably, 0.15 to 0.45, more preferably, 0.20 to 0.40) and a methyl ether substitution degree DS(M) of 1.2 to 2.1 (preferably, 1.3 to 1.7, more preferably, 1.35 to 1.60).

[0037] Preferably, the base cellulose ether is a mixed cellulose ether containing hydroxyalkyl ether substitution and alkyl ether substitution. More preferably, the base cellulose ether is a mixed cellulose ether having a hydroxypropyl ether substitution degree MS (HP) of 0.1 to 1.5 (preferably, 0.2 to 1.2) and a methyl ether substitution degree DS (M) of 1.2 to 2.1 (preferably, 1.3 to 2.0).

[0038] Preferably, the crosslinked cellulose ether comprises a base cellulose ether having crosslinks containing 0.1 to 0.6 weight percent polyether groups, based on the weight of the crosslinked cellulose ether, the base cellulose ether being hydroxyethyl methylcellulose and the crosslinks being polyoxypropylene dioxyethylene ether crosslinks, such as those produced as the reaction product of hydroxyethyl methylcellulose and polypropylene glycol (PPG) glycidyl ether.

[0039] The crosslinking agent used to crosslink the base cellulose ether to form a crosslinked cellulose ether includes a compound having a polyoxyalkylene or poly(alkylene) glycol group and two or more (preferably two) crosslinking groups, such as a halogen group, a glycidyl or epoxy group, and an ethylenically unsaturated group (e.g., a vinyl group) that form an ether bond with the base cellulose ether to form a crosslinked cellulose ether. Preferably, the crosslinking agent is selected from the group consisting of 1,2-dichloro(poly)alkoxyether, dichloropolyoxyethylene, diglycidyl polyalkoxyether, diglycidyl phosphonate, and divinyl polyoxyalkylene containing a sulfone group. Crosslinking agents having two different types of functional groups may be used. Examples include diglycidyl polyoxypropylene and glycidyl (poly)oxyalkyl methacrylate. Preferably, the crosslinking agent contains 2 to 100 (preferably 2 to 20, more preferably 3 to 15) oxyalkylene groups per molecule.

[0040] Preferably, the amount of crosslinking agent contained in the crosslinked cellulose ether is in the range of 0.0001 to 0.05 equivalents (preferably, 0.0005 to 0.01 equivalents, more preferably, 0.001 to 0.005 equivalents), where 1 "equivalent" represents the molar ratio of the crosslinking agent to the number of moles of anhydroglucose units (AGUs) in the base cellulose ether.

[0041] Preferably, crosslinked cellulose ether is irreversibly crosslinked cellulose ether.That is, the crosslink in crosslinked cellulose ether is not broken during intended use of crosslinked cellulose ether under normal conditions.In contrast, reversible crosslink is broken during intended use of crosslinked cellulose ether under normal conditions.An example of reversible crosslink in the cellulose ether intended for use in laundry detergent formulation is that which is produced using aldehyde crosslinking agent (e.g. glyoxal), and this crosslink is decomposed when crosslinked material dissolves in water.

[0042] Preferably, the self-supporting film used in the personal care pod of the present invention comprises: (a) 5 to 80 wt. % (preferably, 5 to 75 wt. %, more preferably, 7.5 to 60 wt. %, and most preferably, 10 to 40 wt. %) of partially hydrolyzed poly(vinyl acetate) based on the weight of the self-supporting film (preferably, the partially hydrolyzed poly(vinyl acetate) is 75 to 99% hydrolyzed (more preferably, 80 to 99% hydrolyzed, and most preferably, 90 to 99% hydrolyzed)); (b) 0.1 to 4 wt. % of the self-supporting film (preferably, the partially hydrolyzed poly(vinyl acetate) is 75 to 99% hydrolyzed (more preferably, 80 to 99% hydrolyzed, and most preferably, 90 to 99% hydrolyzed)); 5% by weight, (preferably 10-40% by weight, more preferably 15-40% by weight, and most preferably 20-35% by weight) of a crosslinking agent, (c) 0.1-45% by weight, (preferably 1-40% by weight, more preferably 5-25% by weight, and most preferably 10-15% by weight) of a copolymer having a weight average molecular weight of 20,000-2,000,000 daltons, (preferably 100,000-1,000,000 daltons, more preferably 250,000-750,000 daltons, and most preferably 350,000-650,000 daltons, based on the weight of the free-standing film. (d) 0.1 to 35 wt % (preferably 1 to 25 wt %, more preferably 2 to 15 wt %, and most preferably 4 to 7.5 wt %) of a poly(alkylene glycol) having a weight average molecular weight of more than 400 to 5,300 daltons (preferably 500 to 1,500 daltons, more preferably 750 to 1,200 daltons, and most preferably 800 to 1,000 daltons) based on the weight of the free-standing film; (e) 0.1 to 45 wt % (preferably 1 to 40 wt %, more preferably 2 to 3 5% by weight, and most preferably 5-25% by weight, of a plasticizer, (f) 0.1-10% by weight (preferably 0.5-7.5% by weight, more preferably 1-6% by weight, and most preferably 2-5.5% by weight) of a poly(isobutylene-co-maleic anhydride) copolymer, based on the weight of the free-standing film, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized (preferably having a degree of neutralization of 50-100%, more preferably 75-100%, and most preferably 95-100%), and (g) 0.5% by weight, based on the weight of the free-standing film (preferably 0.5-7.5% by weight, more preferably 1-6% by weight, and most preferably 2-5.5% by weight).0.01-1.8 wt. % poly(vinylpyrrolidone) (preferably, the poly(vinylpyrrolidone) has a weight average molecular weight of 5,000-2,000,000 Daltons (preferably, 10,000-1,500,000 Daltons, more preferably, 20,000-100,000 Daltons, and most preferably, 20,000-50,000 Daltons)) (preferably, the weight ratio of partially hydrolyzed poly(vinyl acetate) to poly(vinylpyrrolidone) in the free-standing film is greater than 10:1 (preferably, at least 100:1, more preferably, at least 150:1, and most preferably, 150:1-600:1)).

[0043] Preferably, the free-standing film used in the personal care pods of the present invention comprises 20-95 wt. % (preferably at least 25 wt. %, more preferably at least 40 wt. %, and most preferably at least 60 wt. %) (preferably 90 wt. % or less) of a crosslinked cellulose ether based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1-0.6 wt. % of polyether groups based on the weight of the crosslinked cellulose ether, and 5-80 wt. % (preferably at least 5 wt. %, more preferably at least 10 wt. %) (preferably 75 wt. % or less, more preferably 60 wt. % or less, and most preferably 40 wt. % or less) of a partially hydrolyzed poly(vinyl acetate) (preferably 75-99% hydrolyzed, more preferably 80-99% hydrolyzed, and most preferably 90-99% hydrolyzed), based on the weight of the free-standing film.

[0044] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 5-80 wt% (preferably, 5-75 wt%, more preferably, 7.5-60 wt%, most preferably, 10-40 wt%) (preferably, at least 5 wt%, more preferably, at least 10 wt%) (preferably, 75 wt% or less, more preferably, 60 wt% or less, most preferably, 40 wt% or less) partially hydrolyzed poly(vinyl acetate) (preferably, the partially hydrolyzed poly(vinyl acetate) is 75-99% hydrolyzed (more preferably, 80-99% hydrolyzed, most preferably, 90-99% hydrolyzed). More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 5-80 wt% (preferably, 5-75 wt%, more preferably, 7.5-60 wt%, most preferably, 10-40 wt%) based on the weight of the self-supporting film. 5% by weight, more preferably 7.5-60% by weight, most preferably 10-40% by weight (preferably at least 5% by weight, more preferably at least 10% by weight (preferably 75% by weight or less, more preferably 60% by weight or less, most preferably 40% by weight or less) partially hydrolyzed poly(vinyl acetate) having a weight average molecular weight of 10,000-250,000 daltons (preferably 20,000-175,000 daltons, more preferably 30,000-100,000 daltons, most preferably 55,000-80,000 daltons) (preferably, the partially hydrolyzed poly(vinyl acetate) is 75-99% hydrolyzed (more preferably, 80-99% hydrolyzed, most preferably 90-99% hydrolyzed).

[0045] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 45 wt % (preferably 10 to 40 wt %, more preferably 15 to 40 wt %, most preferably 20 to 35 wt %) of a crosslinking agent based on the weight of the self-supporting film. More preferably, the self-supporting film of the present invention further comprises 0.1 to 45 wt % (preferably 10 to 40 wt %, more preferably 15 to 40 wt %, most preferably 20 to 35 wt %) of a crosslinking agent based on the weight of the self-supporting film, the crosslinking agent being an ionic crosslinking agent (e.g., an alkali metal salt, an alkali metal salt, and mixtures thereof). Preferably, the crosslinking agent is Ca 2+ , Mg 2+ , Al 2+ , Al 3+ , Zn 2+ , and mixtures thereof. More preferably, the crosslinking agent is selected from the group consisting of Ca 2+ , Zn 2+ Preferably, the cation is provided as a water soluble inorganic salt or complex, e.g., CaCl2, ZnO, zinc ammonium bicarbonate, and mixtures thereof.

[0046] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 45 wt% (preferably 1 to 40 wt%, more preferably 5 to 25 wt%, most preferably 10 to 15 wt%) of poly(ethylene oxide) based on the weight of the self-supporting film. More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 45 wt% (preferably 1 to 40 wt%, more preferably 5 to 25 wt%, most preferably 10 to 15 wt%) of poly(ethylene oxide) based on the weight of the self-supporting film, and the poly(ethylene oxide) has a weight average molecular weight of 20,000 to 2,000,000 Daltons (preferably 100,000 to 1,000,000 Daltons, more preferably 250,000 to 750,000 Daltons, most preferably 350,000 to 650,000 Daltons).

[0047] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 35 wt% (preferably 1 to 25 wt%, more preferably 2 to 15 wt%, most preferably 4 to 7.5 wt%) of poly(alkylene glycol) based on the weight of the self-supporting film. More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 35 wt% (preferably 1 to 25 wt%, more preferably 2 to 15 wt%, most preferably 4 to 7.5 wt%) of poly(alkylene glycol) based on the weight of the self-supporting film, and the poly(alkylene glycol) has a weight average molecular weight of more than 400 to 5,300 Daltons (preferably 500 to 1,500 Daltons, more preferably 750 to 1,200 Daltons, most preferably 800 to 1,000 Daltons). Most preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 35 wt % (preferably, 1 to 25 wt %, more preferably, 2 to 15 wt %, and most preferably, 4 to 7.5 wt %) of poly(alkylene glycol) based on the weight of the self-supporting film, the poly(alkylene glycol) having a weight average molecular weight of greater than 400 to 5,300 daltons (preferably, 500 to 1,500 daltons, more preferably, 750 to 1,200 daltons, and most preferably, 800 to 1,000 daltons), and the poly(alkylene glycol) is a random copolymer of ethylene oxide and propylene oxide.

[0048] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 45 wt % (preferably, 1 to 40 wt %, more preferably, 2 to 35 wt %, and most preferably, 5 to 25 wt %) of a plasticizer based on the weight of the self-supporting film. More preferably, the free-standing film used in the personal care pod of the present invention further comprises 0.1 to 45 wt % (preferably, 1 to 40 wt %, more preferably, 2 to 35 wt %, and most preferably, 5 to 25 wt %) of a plasticizer based on the weight of the free-standing film, the plasticizer being selected from the group consisting of dipropylene glycol, isomalt, maltitol, sorbitol, xylitol, erythritol, adonitol, dulcitol, pentaerythritol, mannitol, glycerin, diglycerin, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol having a weight average molecular weight of up to 400 Daltons, neopentyl glycol, propylene glycol, 2-methyl-1,3-propanediol, trimethylolpropane, polyether polyol having a weight average molecular weight of up to 400 Daltons, and mixtures thereof. Even more preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 45 wt% (preferably 1 to 40 wt%, more preferably 2 to 35 wt%, most preferably 5 to 25 wt%) of a plasticizer based on the weight of the self-supporting film, the plasticizer being selected from the group consisting of dipropylene glycol, sorbitol, glycerin, and mixtures thereof. Most preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1 to 45 wt% (preferably 1 to 40 wt%, more preferably 2 to 35 wt%, most preferably 5 to 25 wt%) of a plasticizer based on the weight of the self-supporting film, the plasticizer being a mixture of dipropylene glycol, sorbitol, and glycerin.

[0049] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1-10 wt% (preferably 0.5-7.5 wt%, more preferably 1-6 wt%, most preferably 2-5.5 wt%) of poly(isobutylene-co-maleic anhydride) copolymer based on the weight of the self-supporting film. More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1-10 wt% (preferably 0.5-7.5 wt%, more preferably 1-6 wt%, most preferably 2-5.5 wt%) of poly(isobutylene-co-maleic anhydride) copolymer based on the weight of the self-supporting film, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized (preferably, the degree of neutralization is 50-100%, more preferably 75-100%, most preferably 95-100%). Most preferably, the free-standing film used in the personal care pod of the present invention further comprises 0.1-10 wt. % (preferably, 0.5-7.5 wt. %, more preferably, 1-6 wt. %, and most preferably, 2-5.5 wt. %) of a poly(isobutylene-co-maleic anhydride) copolymer based on the weight of the free-standing film, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized (preferably, the degree of neutralization is 50-100%, more preferably, 75-100%, and most preferably, 95-100%), and the poly(isobutylene-co-maleic anhydride) copolymer has a weight average molecular weight of 50,000-500,000 Daltons (preferably, 75,000-250,000 Daltons, more preferably, 100,000-200,000 Daltons, and most preferably, 140,000-180,000 Daltons).

[0050] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1-10 wt % (preferably, 0.5-7.5 wt %, more preferably, 1-6 wt %, and most preferably, 2-5.5 wt %) of poly(isobutylene-co-maleic anhydride) copolymer based on the weight of the self-supporting film, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized with at least one of an alkaline earth metal hydroxide, an alkaline earth metal hydroxide, and an ionomer, and the degree of neutralization is 50-100% (more preferably, 75-100%, and most preferably, 95-100%). More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1-10 wt % (preferably, 0.5-7.5 wt %, more preferably, 1-6 wt %, and most preferably, 2-5.5 wt %) of poly(isobutylene-co-maleic anhydride) copolymer based on the weight of the self-supporting film, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized with at least one of an alkaline earth metal hydroxide and an alkaline earth metal hydroxide, and the degree of neutralization is 50-100% (more preferably, 75-100%, and most preferably, 95-100%). Most preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1-10 wt % (preferably, 0.5-7.5 wt %, more preferably, 1-6 wt %, and most preferably, 2-5.5 wt %) of poly(isobutylene-co-maleic anhydride) copolymer based on the weight of the self-supporting film, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized with at least one of sodium hydroxide, potassium hydroxide, magnesium hydroxide, and calcium hydroxide, and the degree of neutralization is 50-100% (more preferably, 75-100%, and most preferably, 95-100%).

[0051] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.01 to 1.8 wt% poly(vinylpyrrolidone) based on the weight of the self-supporting film. More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.01 to 1.8 wt% poly(vinylpyrrolidone) based on the weight of the self-supporting film, and the poly(vinylpyrrolidone) has a weight average molecular weight of 5,000 to 2,000,000 Daltons (preferably 10,000 to 1,500,000 Daltons, more preferably 20,000 to 100,000 Daltons, and most preferably 20,000 to 50,000 Daltons). More preferably, the free-standing film used in the personal care pods of the present invention further comprises 0.01 to 1.8 wt. % poly(vinylpyrrolidone) based on the weight of the free-standing film, the poly(vinylpyrrolidone) having a weight average molecular weight of 5,000 to 2,000,000 Daltons (preferably, 10,000 to 1,500,000 Daltons, more preferably, 20,000 to 100,000 Daltons, and most preferably, 20,000 to 50,000 Daltons), and the weight ratio of partially hydrolyzed poly(vinyl acetate) to poly(vinylpyrrolidone) in the free-standing film is greater than 10:1 (preferably, at least 100:1, more preferably, at least 150:1, and most preferably, 150:1 to 600:1).

[0052] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0-10 wt% of optional additives. More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0-10 wt% of optional additives, the optional additives being selected from the group consisting of preservatives, antioxidants, viscosity modifiers, solubility modifiers, antibacterial agents, binding agents, chelating agents, fillers, extenders, antifoaming agents, lubricants, release agents, antiblocking agents, tackifiers, coalescing agents, detackifiers, and nanoparticles (e.g., silicate-type nanoclays).

[0053] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0-10 wt% of an optional additive, the optional additive comprising nanoparticles (preferably silicate nanoclay). More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.05-1 wt% (more preferably 0.1-0.5 wt%, most preferably 0.1-0.3 wt%) of nanoparticles (preferably silicate nanoclay). Most preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0.1-0.3 wt% of nanoparticles (preferably silicate nanoclay).

[0054] Preferably, the self-supporting film used in the personal care pod of the present invention further comprises 0-10 wt% of an optional additive, the optional additive comprising an antifoaming agent. More preferably, the self-supporting film used in the personal care pod of the present invention further comprises 1-10 wt% (more preferably, 2-7.5 wt%, most preferably, 3-6 wt%) of an antifoaming agent. Most preferably, the self-supporting film used in the personal care pod of the present invention further comprises 3-6 wt% of an antifoaming agent.

[0055] The free-standing films used in the personal care pods of the present invention can be prepared by techniques known to those skilled in the art, including solution casting onto a substrate such as glass, polyethylene terephthalate (PET), or metal. Typically, water is used as the solvent for solution casting, although other solvents may be used. After casting, the film may be dried by heating at an elevated temperature, e.g., 65-80°C.

[0056] Preferably, the personal care formulation contained in the personal care pod of the present invention is selected from the group consisting of shampoo, conditioning shampoo, hair conditioner, hand cleanser, facial cleanser, body wash, skin moisturizing formulation (hand / face / body), shaving cream, and topical medicine. More preferably, the personal care formulation contained in the personal care pod of the present invention is selected from the group consisting of hand cleanser, facial cleanser, skin moisturizing formulation (hand / face / body), and shaving cream. Even more preferably, the personal care formulation contained in the personal care pod of the present invention is selected from the group consisting of hand cleanser, facial cleanser, and shaving cream. Most preferably, the personal care formulation contained in the personal care pod of the present invention is a hand cleanser.

[0057] Preferably, the personal care pods of the present invention are single-use personal care pods, which are formulated to be exposed to water by a user and then used (e.g., to wash the user's hands, face, or hair).

[0058] Preferably, the personal care formulation contained in the personal care pod of the present invention is a personal care concentrate, i.e., the personal care formulation incorporated in the personal care pod is formulated to be diluted with a sufficient volume of water to facilitate the formation of a large amount of the personal care formulation for use by the end user (e.g., consumer).Preferably, a large amount is an amount sufficient to allow at least two applications of the personal care formulation, preferably at least five applications, more preferably at least ten applications (e.g., at least two separate hair washings for shampoos, at least two separate hand washings for hand cleansers).

[0059] Preferably, the personal care formulation contained in the personal care pod of the present invention comprises at least one of a dermatologically acceptable cleansing surfactant and a conditioning agent.

[0060] Preferably, the personal care formulation contained in the personal care pod of the present invention contains 0 to 20 wt. % water (preferably, 0 to 15 wt. %, more preferably, 0 to 10 wt. %, and most preferably, 0 to 7.5 wt. %) based on the weight of the personal care formulation.

[0061] Preferably, the personal care formulation contained in the personal care pod of the present invention comprises a dermatologically acceptable cleansing surfactant, and the dermatologically acceptable cleansing surfactant may be an alkyl polyglucoside (e.g., lauryl glucoside, coco-glucoside, decyl glucoside), a glycinate (e.g., sodium cocoyl glycinate), a betaine (e.g., an alkyl betaine such as cetyl betaine and an amido betaine such as cocamidopropyl betaine), a taurate (e.g., sodium methyl cocoyl taurate), a glycolate (e.g., sodium methyl cocoyl taurate), a glycerol ... Thamates (e.g., sodium cocoyl glutamate), sarcosinates (e.g., sodium lauroyl sarcosinate), isethionates (e.g., sodium cocoyl isethionate, sodium lauroyl methyl isethionate), sulfoacetates (e.g., sodium lauryl sulfoacetate), alaninates (e.g., sodium cocoyl alaninate), amphoacetates (e.g., sodium cocoamphoacetate), sulfates (e.g., sodium lauryl ether sulfate (SLES)), sulfonates (e.g., C 14~16Sodium olefin sulfonate), succinates (e.g., disodium lauryl sulfosuccinate), fatty alkanolamides (e.g., cocamide monoethanolamine, cocamide diethanolamine, soyamide diethanolamine, lauramide diethanolamine, oleamide monoisopropanolamine, stearamide monoethanolamine, myristamide monoethanolamine, lauramide monoethanolamine, capramide diethanolamine, ricinoleamide diethanolamine, myristamide diethanolamine, stearamide diethanolamine, oleylamide diethanolamine, tallowamide diethanolamine, lauramide monoisopropanolamine, tallowamide monoethanolamine, isostearamide diethanolamine, isostearamide monoethanolamine), and mixtures thereof. More preferably, the personal care formulation contained in the personal care pod of the present invention comprises a dermatologically acceptable cleansing surfactant, and the dermatologically acceptable cleansing surfactant comprises sodium lauryl ether sulfate. Most preferably, the personal care formulation contained in the personal care pod of the present invention comprises a dermatologically acceptable cleansing surfactant, the dermatologically acceptable cleansing surfactant comprising a blend of sodium lauryl ether sulfate, cocamide monoethanolamine, and cocamidopropyl betaine.

[0062] Preferably, the personal care formulation contained in the personal care pod of the present invention comprises a dermatologically acceptable cleansing surfactant.

[0063] Preferably, the personal care formulation contained in the personal care pod of the present invention comprises 5 to 85% by weight (preferably 10 to 75% by weight, more preferably 20 to 60% by weight, most preferably 25 to 40% by weight) of a dermatologically acceptable cleansing surfactant, based on the weight of the personal care formulation.

[0064] Preferably, the dermatologically acceptable cleansing surfactant is in isotropic phase in the personal care formulation contained in the personal care pod of the present invention. When used herein and in the appended claims with respect to the dermatologically acceptable cleansing surfactant, the term "isotropic phase" means that the individual molecules of the surfactant are associated but remain in a micellar state. The micelles may have a spherical shape or may become elongated at higher concentrations, but maintain mobility and dynamic exchange and dissolve easily. This is in contrast to the gel phase, in which the elongated micelles begin to pack into an array, e.g., a long cylindrical structure, and lose their mobility and dynamic exchange capabilities, so they do not dissolve or disperse easily upon dilution.

[0065] Preferably, the personal care formulation contained in the personal care pod of the present invention comprises a dermatologically acceptable silicone selected from the group consisting of amodimethicone, cyclomethicone, dimethicone, dimethiconol, hexadecylmethicone, hexamethyldisiloxane, diisopropanolamino-PG-propyldisiloxane, methicone, phenyldimethicone, bis-vinyldimethicone, stearoxydimethicone polyalkylsiloxanes, polyalkylarylsiloxanes, silicone gums (i.e., polydiorganosiloxanes having a weight average molecular weight of 200,000 to 1,000,000 Daltons), polyaminofunctional silicones (e.g., DOWSIL™ 969 Emulsion, DOWSIL™ CE-7081 Smart Style, DOWSIL™ 5-7113 Silicone Quat MicroEmulsion), and combinations thereof.

[0066] Preferably, the personal care formulation contained in the personal care pod of the present invention comprises 1 to 20% by weight (preferably, 2 to 15% by weight, more preferably, 2.5 to 10% by weight, and most preferably, 4 to 8% by weight) of a dermatologically acceptable silicone, based on the weight of the personal care formulation.

[0067] More preferably, the personal care formulations included in the personal care pods of the present invention may optionally contain antimicrobial / preservatives (e.g., benzoic acid, sorbic acid, phenoxyethanol, methylisothiazolinone, ethylhexylglycerin); rheology modifiers (e.g., PEG-150 pentaerythrityl tetrastearate); soaps; colorants; pH adjusters; antioxidants (e.g., butylated hydroxytoluene); humectants (e.g., glycerin, sorbitol, monoglycerides, lecithin, glycolipids, fatty alcohols, fatty acids, polysaccharides, sorbitan esters, polysorbates (e.g., polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 80), diols (e.g., propylene glycol), diol analogs, triols, triol analogs, cationic polymeric polyols); waxes; foaming agents; emulsifiers; fragrances; chelating agents (e.g., tetrasodium ethylenediaminetetraacetate); preservatives. agents (e.g., benzoic acid, sorbic acid, phenoxyethanol, methylisothiazolinone);bleaching agents;lubricants;sensation modifiers;sunscreen additives;vitamins;proteins / amino acids;plant extracts;natural ingredients;bioactive agents;anti-degradation additives;pigments;acids;penetrating agents;antistatic agents;anti-frizz agents;anti-dandruff agents;hair waving / straightening agents;hair styling agents;hair oils;natural oils or esters emollients (e.g., mono-, di-, tri-glycerides, e.g., sunflower oil, seed oil, coconut oil, cottonseed oil, borage oil, borage seed oil, evening primrose oil, castor and hydrogenated castor oil, rice bran oil, soybean oil, olive oil, safflower oil, shea butter, jojoba oil, and combinations thereof); absorbents; hard particles; soft particles; conditioning agents (e.g., guar hydroxypropyltrimonium chloride, PQ-10, PQ-7); slip agents; opacifiers; pearlescent agents, and salts.

[0068] Preferably, the method of using the personal care pod of the present invention comprises applying water to the personal care pod, the personal care pod being a single-use personal care pod, to dissolve or disperse the self-supporting film and release the personal care formulation, and applying the personal care formulation to skin or hair (preferably mammalian skin or hair, more preferably human skin or hair). Preferably, the personal care formulation is applied to the skin or hair concomitantly with the dissolution or dispersion of the self-supporting film. More preferably, the personal care formulation is applied to the skin or hair simultaneously with the dissolution or dispersion of the self-supporting film.

[0069] Preferably, the method of using the personal care pod of the present invention includes providing a container, where the personal care pod is a personal care concentrate pod and the personal care formulation contained in the personal care concentrate pod is a personal care formulation concentrate, (preferably the container has a water level marking to facilitate accurate dosing), adding water to the container, adding the personal care concentrate pod to the container, stirring the contents of the container, dissolving or dispersing the free-standing film of the personal care concentrate pod in the water, and mixing the water with the personal care formulation concentrate from the personal care concentrate pod to form a use strength personal care formulation in the container. The term "use strength" as used herein and in the appended claims with respect to a personal care formulation means the concentration used when applying the formulation to skin or hair.

[0070] Some embodiments of the present invention will now be described in detail in the following examples.

[0071] Synthesis S1: Crosslinked cellulose ether The crosslinker used in synthesis S1 was a linear poly(propylene glycol) diglycidyl ether made from polypropylene glycol (PPG) having a molecular weight of approximately 400 daltons and the formula:

[0072] [ka] [wherein n is 5.7 to 6.7 (EPILOX™ M985 poly(propylene glycol) diglycidyl ether crosslinker available from Leuna-Harze GmbH, Leuna, DE)].

[0073] Milled cellulose floc (1.5 mol) was added to a 5 L autoclave. The autoclave was purged with nitrogen gas three times and the contents of the autoclave were then heated to 40° C. Dimethyl ether (DME, 4.7 mol / mol anhydroglucose units (AGU)) and methyl chloride (MCl, 3.2 mol / mol AGU) were then injected into the autoclave. Caustic soda (NaOH, 50 wt% strength aqueous, 1.9 mol NaOH / mol AGU) was added to the autoclave in three portions over a period of 2 minutes at a temperature of 40° C. The reaction mixture was held at 40° C. for 30 minutes. Ethylene oxide (0.45 mol / mol AGU) was then added and the reaction mixture was held at 40° C. for 10 minutes. The crosslinker (EPILOX™ M985 crosslinker, 0.0025 mol / mol AGU) was dissolved in 20 mL of isopropanol and added to the contents of the autoclave in six portions spaced 30 seconds apart. The contents of the autoclave were then heated to 80° C. in 40 minutes. At 80° C., a water-soluble monovalent copper ligand (MCL 2, 1.3 mol / mol AGU) was rapidly injected into the autoclave. NaOH (0.67 mol / mol AGU) was then added in seven portions over 30 minutes, followed by a cook-off period of 70 minutes at 80° C. Following this, the product crosslinked cellulose ether was washed in hot water (>95° C.), neutralized with formic acid, granulated, dried, and milled.

[0074] Comparative Examples C1-C18 and Examples 1-15: Film / Additive Blends Water-soluble film / additive blends were prepared according to Comparative Examples C1-C18 and Examples 1-15 by mixing together the components in the concentrations listed in Table 1.

[0075] [Table 1]

[0076] Viscosity measurements of films blended with additives The viscosities of the water-soluble film / additive blends prepared according to Comparative Examples C1-C18 and Examples 1-15 were measured using a Brookfield DV-II programmable viscometer equipped with a CP-52 spindle at 25° C. Measurements were made for each blend at 5 rpm, 10 rpm, 20 rpm, and 50 rpm and are reported in Table 2.

[0077] [Table 2]

[0078] Examples 16 to 25: Water-soluble films Water-soluble films were formed in each of Examples 16-25 by placing a water-soluble film / additive blend prepared according to one of Examples 1-10, as described in Table 3, in a ventilated oven at 60° C. and drying to form a film. Once formed, the film was then redispersed in water to form a 1 wt. % aqueous solution. The viscosity of these 1 wt. % solutions was then measured at 25° C. using a Brookfield DV-II programmable viscometer equipped with a CP-52 spindle. Measurements were made for each blend at 5 rpm, 10 rpm, 20 rpm, and 50 rpm and are reported in Table 3.

[0079] [Table 3]

[0080] Prophetic Formulation F1: Concentrated Shampoo Formulation A shampoo formulation of Prophetic Formulation F1 is prepared by mixing together the ingredients in the weight proportions set forth in Table 4.

[0081] [Table 4]

[0082] Predictive film resistance to concentrated shampoo formulations. A drop of a concentrated prophetic shampoo formulation from prophetic formulation F2 is applied to the surface of a water-soluble film formed according to each of Examples 16-25. Each film is observed to resist penetration of the concentrated hard surface cleaning composition.

[0083] Synthetic S2: Freestanding film The crosslinked cellulose ether (1 g) prepared according to Synthesis S1, calcium chloride dihydrate (0.4 g), and deionized water (98.6 g) were mixed together, and the mixture was then deposited on a substrate and dried in a ventilated oven at 60° C. to form a film.

[0084] Resistance of freestanding films to concentrated shampoo formulations. A prophetic concentrated shampoo formulation according to prophetic formulation F1 is added to an Eppendorf tube. A free-standing film prepared according to synthesis S2 is used to cap the opening of the Eppendorf tube. The Eppendorf tube is then inverted so that the opening faces down, such that the concentrated shampoo formulation in the tube is supported by the free-standing film. The free-standing film is observed to resist penetration of the concentrated shampoo formulation.

Claims

1. A personal care pod, a free-standing film comprising 20 to 100 weight percent crosslinked cellulose ether, based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1 to 0.6 weight percent polyether groups, based on the weight of the crosslinked cellulose ether; A personal care formulation; Including, A personal care pod, wherein the self-supporting film forms a cavity, the personal care formulation is disposed within the cavity, the personal care formulation is in contact with the self-supporting film, and the self-supporting film encapsulates the personal care formulation.

2. 10. The personal care pod of claim 1, wherein the personal care formulation is selected from the group consisting of shampoo, conditioning shampoo, hair conditioner, hand cleanser, facial cleanser, body wash, skin moisturizing formulation (hand / face / body), shaving cream, and topical medication.

3. 10. The personal care pod of claim 1, wherein the free-standing film has an average thickness of 5 to 200 μm.

4. The personal care pod of claim 3, wherein the crosslinked cellulose ether is an irreversibly crosslinked cellulose ether, and the polyether group in the irreversibly crosslinked cellulose ether is a polyoxyalkylene group having 2 to 100 oxyalkylene groups.

5. 5. The personal care pod of claim 4, wherein the irreversibly crosslinked cellulose ether comprises a base cellulose ether and a crosslink, the crosslink contains the polyether group, and the base cellulose ether contains a hydroxyalkyl ether group and an alkyl ether group.

6. (a) 5 to 80 weight percent, based on the weight of the free-standing film, of partially hydrolyzed poly(vinyl acetate); (b) 0.1 to 45 weight percent of a crosslinking agent, based on the weight of the free-standing film; (c) 0.1 to 45 weight percent, based on the weight of the free-standing film, of poly(ethylene oxide) having a weight average molecular weight of 20,000 to 2,000,000 daltons; (d) 0.1 to 35 weight percent, based on the weight of the free-standing film, of a poly(alkylene glycol) having a weight average molecular weight of greater than 400 to 5,300 daltons; (e) 0.1 to 45 weight percent of a plasticizer, based on the weight of the free-standing film; (f) 0.1 to 10 weight percent, based on the weight of the free-standing film, of a poly(isobutylene-co-maleic anhydride) copolymer, the poly(isobutylene-co-maleic anhydride) copolymer being at least partially neutralized; and (g) 0.01 to 1.8 weight percent poly(vinylpyrrolidone), based on the weight of the free-standing film. The personal care pod of claim 1 , further comprising at least one of:

7. The self-supporting film is 20 to 95 weight percent of the crosslinked cellulose ether, based on the weight of the free-standing film, the crosslinked cellulose ether containing 0.1 to 0.6 weight percent of polyether groups, based on the weight of the crosslinked cellulose ether; 5 to 80 weight percent of the partially hydrolyzed poly(vinyl acetate), based on the weight of the free-standing film; The personal care pod of claim 1 , comprising:

8. 8. The personal care pod of claim 7, wherein the self-supporting film further comprises optional additives, the optional additives being selected from the group consisting of preservatives, antioxidants, viscosity modifiers, solubility modifiers, antimicrobial agents, binders, chelating agents, fillers, extenders, antifoaming agents, lubricants, release agents, antiblocking agents, tackifiers, coalescing agents, detackifying agents, and nanoparticles.

9. 10. A method of using the personal care pod of claim 1, wherein the personal care pod is a single-use personal care pod; applying water to the single-use personal care pod to dissolve or disperse the self-supporting film and release the personal care formulation; applying the personal care formulation to the skin or hair; A method comprising:

10. 1. A method of forming a personal care formulation comprising: Providing a personal care pod according to claim 1, wherein the personal care pod is a personal care concentrate pod, and the personal care formulation contained in the personal care concentrate pod is a personal care formulation concentrate; Providing a container; adding water to the vessel; adding said personal care concentrate pod to said container; agitating the contents of the vessel; dissolving or dispersing the free-standing film of the personal care concentrate pod in the water; mixing the water with the personal care formulation concentrate from the personal care concentrate pod to form a working strength personal care formulation in the container; A method comprising:

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