WO2022073602A1 - Skin-cleansing pad treated with a cleansing lotion suitable for makeup removal - Google Patents
Skin-cleansing pad treated with a cleansing lotion suitable for makeup removal Download PDFInfo
- Publication number
- WO2022073602A1 WO2022073602A1 PCT/EP2020/078086 EP2020078086W WO2022073602A1 WO 2022073602 A1 WO2022073602 A1 WO 2022073602A1 EP 2020078086 W EP2020078086 W EP 2020078086W WO 2022073602 A1 WO2022073602 A1 WO 2022073602A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cleansing
- skin
- lotion
- article according
- polyglycerol
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/0208—Tissues; Wipes; Patches
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/34—Alcohols
- A61K8/345—Alcohols containing more than one hydroxy group
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/37—Esters of carboxylic acids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/39—Derivatives containing from 2 to 10 oxyalkylene groups
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
- A61Q1/14—Preparations for removing make-up
Definitions
- the present invention relates to a skin-cleansing pad suitable for makeup removal which carries a cleansing lotion that can be activated by moisturizing it with water.
- Articles pre-impregnated with lotion or emulsion which can be used directly without the need to add additional cleansing or makeup-removing products at the time of use, are commercially available.
- US 2011/0302734 Al describes a skin-cleansing article comprising a fibrous substrate and a cleansing composition that is activated by moistening with water followed by a mechanical action so as to obtain a cleansing foam, wherein the cleansing composition comprises at least one surfactant and a humectant, and the amount of water on the substrate is less than 25% by weight of the article.
- the present invention relates to a skin-cleansing article, which is disposable after use.
- the article comprises a pad made of a fibrous material forming a substrate, and a lotion with a substantially dry feel on the substrate.
- the invention relates to a skincleansing article comprising a fibrous substrate, wherein the fibrous substrate is a pad having a basis weight of 100 g/m 2 to 350 g/m 2 and comprising or consisting of cellulosic fibers, preferably cotton fibers.
- the fibrous substrate comprises a cleansing lotion comprising:
- a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, preferably a polyglycerol-based emulsifier, and
- the present invention thus relates to the following embodiments (items):
- a skin-cleansing article comprising a fibrous substrate, wherein the fibrous substrate is a pad having a basis weight of 100 g/m 2 to 350 g/m 2 and comprising or consisting of cellulosic fibers, preferably cotton fibers; and wherein the fibrous substrate comprises a cleansing lotion comprising:
- the skin-cleansing article according to item 1 or 2 wherein the cleansing lotion comprises (al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier, based on the total weight of the cleansing lotion. 4. The skin-cleansing article according to any one of items 1 to 3, wherein the fibrous substrate has two outer surfaces and the skin-cleansing article is obtained by applying the cleansing lotion to one outer surface.
- the skin-cleansing article according to any one of items 1 to 5, wherein the skincleansing article comprises the cleansing lotion in an amount of 0.1 to 1.2 g, preferably in an amount of 0.15 to 1.0 g, more preferably in an amount of 0.20 to 0.8 g, per 1 g of the fibrous substrate.
- the fibrous substrate comprises up to 30 wt.-% of synthetic fibers, preferably up to 20 wt.-% of synthetic fibers, more preferably up to 10 wt.-% of synthetic fibers, and even more preferably up to 5 w.-% of synthetic fibers, based on the total weight of the fibrous substrate, the remainder being natural cellulosic fibers such as cotton fibers; wherein the synthetic fibers are preferably selected from viscose fibers, polyester fibers, polypropylene fibers, and mixtures thereof.
- a tensile strength in the dry state of at least 10 N, preferably at least 15N in the machine direction (MD);
- nonionic surfactant preferably polyglycerol-based emulsifier (al) has a hydrophilic-lipophilic balance (HLB) value equal to or greater than 9, preferably equal to or greater than 10, more preferably equal to or greater than 12, for instance of about 14.
- HLB hydrophilic-lipophilic balance
- non-ionic surfactant is a polyglycerol-based emulsifier (al) comprising an ester of a fatty acid and a polyglycerol, the ester including on average 2 to 8, preferably 2 to 6, repeating units of glycerol and being derived from a fatty acid having a number of carbon atoms of 8 to 16, preferably 8 to 12.
- al polyglycerol-based emulsifier
- the surfactant system (a) further comprises (a2) one or more surfactants selected from amphoteric surfactants and non-ionic surfactants, preferably from alkyl betaines, alkyl amidobetaines, alkyl sulfobetaines, alkyl imidazolines, and amino acid-derived surfactants, more preferably from alkyl betaines.
- hydrophilic solvent (b) comprises a polyhydroxy alcohol, preferably a mono- or dihydroxyl alcohol, more preferably propylene glycol such as 1,2-propylene glycol, butylene glycol, pentylene glycol, caprylyl glycol, and mixtures thereof.
- (a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
- Process for cleansing the skin and/or removing makeup on skin comprising the steps of:
- Cleansing lotion comprising:
- (a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
- Cleansing lotion according to item 19 comprising:
- the present invention relates to a skin-cleansing article comprising a fibrous substrate, wherein the fibrous substrate is a pad having a basis weight of 100 g/m 2 to 350 g/m 2 and comprising or consisting of cellulosic fibers, preferably natural cellulosic fibers such as cotton fibers; and wherein the fibrous substrate comprises a cleansing lotion comprising:
- a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, preferably a polyglycerol-based emulsifier, and
- the lotion and thus also the skin-cleansing article has a substantially dry appearance and feel.
- the cleansing lotion is activated by moistening the pad with water. It is possible to determine the water content in the lotion composition by conducting a water determination according to Karl Fischer.
- the skin-cleansing article can be extracted with suitable organic solvents, such as water-free ethanol, followed by the water determination of the ethanol extract according to Karl Fischer. If any water remains in the fibrous substrate after the extraction this can be determined by conventional methods (e.g. by drying in an oven at 50°C until its weight no longer changes and determining the weight loss) and added to the water content determined by Karl Fischer.
- suitable organic solvents such as water-free ethanol
- the user adds an amount of water which leads for instance to a 5-fold to 20- fold, e.g. 10-fold to 15-fold dilution of the cleansing lotion.
- an amount of water which leads for instance to a 5-fold to 20- fold, e.g. 10-fold to 15-fold dilution of the cleansing lotion.
- non-ionic emulsifier preferably polyglycerol-based emulsifier
- the micelles will emulsify any oil present on the skin of the user. Accordingly, in one embodiment of the invention, the user of the skin-cleansing pad is instructed to use an amount of water which leads to a concentration of the non-ionic emulsifier, preferably polyglycerol-based emulsifier, above the critical micelle concentration (CMC) of the respective emulsifier.
- CMC critical micelle concentration
- micelle we understand, in accordance with the usual understanding in the art, an aggregate of the emulsifier (surfactant) molecules dispersed in a liquid (here the aqueous lotion phase).
- a typical micelle in aqueous solution forms an aggregate with the hydrophilic "head” regions in contact with surrounding solvent, sequestering the hydrophobic single-tail regions in the micelle center.
- foam may be formed when the pad is subjected to a mechanical action, such as bending or rubbing. This is however not essential for the cleansing action.
- the pad impregnated with the diluted and activated lotion is then applied to the areas of skin that are to be cleansed. Depending on the ingredients of the lotion, it may also exert a skincare effect.
- the form and size of the skin-cleansing pad is not particularly limited, as long as it is suitable for the targeted application.
- the shape may be circular, oval, polygonal or some other shape, and the sizes may range from 25 to more than 100 cm 2 .
- the pads are circular and have a diameter ranging from 4 to 7 cm, for instance 5 to 6 cm.
- the pads have a rectangular shape and size ranging from e.g. 40 to 60 cm 2 , e.g. 45 to 55 cm 2 .
- the basis weights are generally between 100 and 350 g/m 2 .
- An embodiment of the invention is directed towards pads obtained from a lap of fibrous material made only of cotton or cotton mixed with other optionally chopped fibers.
- the fibers of the lap are entangled so as to form a nonwoven arrangement of greater or lesser mechanical strength depending on the strength requirements of the article.
- a fibrous pad intended for cleansing the skin, and in particular for the removal of makeup is chosen for its beneficial properties. It is thick enough to be held comfortably in the hand when it is moistened. It absorbs and wipes away impurities. It conserves its form during use, on rubbing. It does not form fluff and does not leave fibers on the skin.
- the substrate of the skin-cleansing pad is a lap comprising or consisting of cellulosic fibers, e.g. cotton fibers, comprising three fiber (e.g. cotton) layers, two exterior layers and one central layer, characterized in that the exterior layers, between which the central layer is interposed, are card webs. Further, the central layer comprises laminated cellulosic fibers (e.g. cotton fibers) oriented substantially obliquely between the two planes formed by the exterior layers.
- This lap is preferably obtained by a continuous process including the steps of superimposing the three layers and subjecting them to a scouring treatment, a bleaching treatment and then a rinsing treatment, to impart to the layers a very good mutual cohesion.
- This type of pad and its manufacture is described in EP 0 681 621.
- the mechanical properties of the pads can be improved by using either one or both of the following two techniques:
- One preferred embodiment of the invention relates to a fibrous substrate (pad) obtained according to the above second technique.
- the hydroentangling process water-jet entangling
- This process makes it possible to reduce the surface pilling capacity and to increase the tensile strength of the lap.
- This process which is purely mechanical, allows the manufacture of laps composed up to 100% of cellulosic fibers (e.g. cotton fibers). This process is further described in US 2011/0302734 Al.
- hydroentangling processes preferably forms a relief at the surface of the pads which generally results from compression of the fibers either under the effect of embossing or calendering, or under the effect of a hydroentanglement process intended to join several laps of fibers together.
- the pad to be used in the present invention comprises two outer layers joined together, wherein at least one outer layer has a surface with a texture defined thereupon.
- the shape and arrangement of this surface texture is not particularly limited. Examples of a suitable surface texture formed on at least one surface of the pad include continuous straight lines, in particular parallel lines, continuous curved lines, a square-mesh grid or a lozengeshaped grid.
- the average distance (height) between the raised parts of the surface texture and the depressions between these raised parts may e.g. be between 0.1 and 1.0 mm, e.g. between 0.2 and 0.5 mm.
- the pad to be used in the present invention is a hydrophilic cotton pad used for skin-care and exhibiting a specific surface weight of at least 150 g/m 2 , comprising two different outer sides of which the fibers are hydroentangled, characterized in that the first outer side comprises a texture formed by hollow depressions, e.g. striae, mutually apart by a spacing si which is between 1 and 8 mm and a depression (e.g. striae) depth D of at least 0.25 mm, e.g.
- the pad's tensile strength is at least 10 N, preferably at least 15N in the direction of motion (MD) and at least 4N, preferably at least 7N, in the direction transverse thereto (CD), as determined by the testing procedure described in the specification.
- the first outer side comprises hollow depressions (e.g. striae) at least 50% of the pad fibers are entangled.
- the spacing si between the depressions (e.g.) striae of the first side is between 1.2 and 5.5 mm and preferably between 2 and 4 mm.
- the pad has at least one surface having a raised pattern defined thereupon, said skin care pad comprising: (a) at least two outer layers of absorbent fibrous material joined together; and (b) at least one series of yarns placed between said outer layers, characterized in that the thickness of at least one of the outer layers is less than the average diameter of the yams.
- the central layer interposed between the two outer layers preferably includes cellulosic fibers, such as cotton fibers.
- the raised pattern has protrusions of height H (as defined in US 2009/0068409 Al) between 0.2 and 2.0 mm, in particular between 0.3 and 0.5 mm.
- the shape and arrangement of the raised pattern is not particularly limited.
- raised patterns formed at the surface of the pad include continuous straight lines, in particular parallel lines, continuous curved lines, a square-mesh grid or a lozenge-shaped grid, of the type shown in Figures 2A to 2D of US 2009/0068409,
- bonding of the outer layers is carried out by means of a technique chosen from hydroentanglement, glueing and hot-melt bonding (thermobonding), the choice of the technique depending on the fiber mixture used for the inner layer(s).
- the fibrous substrate (pad) to be used has a basis weight of 100 g/m 2 to 350 g/m 2 , preferably 175 g/m 2 to 275 g/m 2 , more preferably 200 g/m 2 to 250 g/m 2 . It comprises or consists of cellulosic fibers, preferably cotton fibers.
- Suitable cellulosic fibers in particular natural cellulosic fibers, can be selected from "primary" fibrous materials (e.g. raw pulps) or secondary fibrous materials, whereby a "secondary" fibrous material includes recycled fibers.
- the primary fibrous materials may relate both to a chemically digested pulp and to mechanical pulp such as thermorefiner mechanical pulp (TMP), chemothermorefiner mechanical pulp (CTMP) or high temperature chemithermomechanical pulp (HTCTMP). Fibers of softwood (usually originating from conifers), hardwood (usually originating from deciduous trees) or from cotton linters can be used for example.
- Fibers from esparto (alfa) grass, bagasse (cereal straw, rice straw, bamboo, hemp), kemp fibers, flax, and other woody and cellulosic fiber sources can also be used as raw materials. Preference is given to the use of natural fibers such as cotton fibers.
- the cellulosic fibers, preferably cotton fibers can be bleached or unbleached.
- the cellulosic fibers to be used are preferably "natural" cellulosic fibers, i.e. cellulosic fibers originating from plants which have not been subjected to any regeneration process wherein the cellulosic material is dissolved and regenerated in fibrous form. The term "natural” therefore also includes secondary, in particular recycled fibers.
- the fibrous substrate (pad) comprises less than 50 wt.-% of synthetic fibers, preferably up to 30 wt.-% of synthetic fibers, more preferably up to 20 wt.-% of synthetic fibers, e.g. up to 10 wt.-% of synthetic fibers, or up to 5 w.-% of synthetic fibers, based on the total weight of the fibrous substrate.
- the synthetic fibers are preferably selected from synthetic fibers such as viscose fibers, polyester fibers, polypropylene fibers, and mixtures thereof. If the fibers are to be thermobonded, polyester fibers and/or polypropylene fibers or mixtures thereof with viscose fibers are preferably used.
- the fibrous substrate (pad) preferably shows one or more of following properties:
- the fibrous substrate (pad) has two outer surfaces.
- the skin-cleansing article is preferably obtained by applying the cleansing lotion to one outer surface (the treated outer surface).
- the cleansing lotion does not fully impregnate the fibrous substrate but rather is present on the treated outer surface in a greater amount than on the other outer surface.
- This inhomogeneous distribution of cleansing lotion can also be described as a concentration gradient with the greatest amount of cleansing lotion being present on the treated outer surface.
- a fibrous substrate in which the treated surface forms a visible relief at the surface or a has a visible raised pattern obtainable by the aforementioned techniques.
- "Visible” means in this context discernible with the naked eye. This relief or pattern constitutes a visible signal to the user of the skin-cleansing article that the outer surface carrying the same is more effective in cleansing the skin. This brings along the additional benefit that the treated surface comprising the greater amount of cleansing lotion is brought into contact with the skin of the user.
- the application technique for the cleansing lotion is selected from suitable, preferably contact-free, application techniques known in the art such as die coating (slot-die coating) and spray coating.
- die coating slot-die coating
- spray coating The benefit of slot-die coating is that it is highly scalable and suitable for rapidly depositing thin and uniform films with minimal material waste and lower operational costs.
- the water content of the skin-cleansing article is less than 15 wt.-%, preferably less than 10 wt.-%, more preferably less than 9 wt.-%, e.g. less than 8 wt.-%, based on the total weight of the article.
- This relatively low water amount is advantageous since it makes it possible to dispense with the use of preservatives, such as antibacterial components in the cleansing lotion.
- the cleansing lotion is free of preservatives, such as antibacterial actives.
- pH adjusting compounds such as organic acids or buffering compound including organic acids, which also may have an antibacterial effect can however be used.
- the above amount of water can be obtained by suitably adjusting the amount of water in the fibrous substrate (pad) and/or cleansing lotion.
- the cleansing lotion to be applied to the fibrous substrate (pad) has a water content of less than 20 wt.-%, preferably less than 15 wt.-%, more preferably less than 10 wt.-%, based on the total weight of the cleansing lotion.
- the water activity of the finished skin-cleansing article (inclusive lotion) is preferably less than 0,7, more preferably less than 0.65, e.g. less than 0.6 (each measured at 23 ⁇ 1°C as described in the examples).
- the fibrous substrate for instance a pad fully made of cotton (in the following also referred to as "cotton pad”) is slightly overdried before the cleansing lotion is applied thereto (note: the term “cotton pad” does not exclude the presence of any (synthetic) yarns possibly used to provide one surface thereof with a visible pattern in accordance with the aforementioned techniques).
- the term “overdried” means in this context that the moisture content of the fibrous substrate (pad) is lower than that obtainable by storing the pad at room temperature (20°C) and humidity (40-50%) until the equilibrium moisture content has been reached.
- the equilibrium moisture content is about 8% wt.-% and an "overdried" pad may have a moisture content of 5 to 7 wt.-%, e.g. 7 wt.-%.
- a moisture content lower than the equilibrium moisture content can be obtained by suitably adapting the manufacturing conditions and/or drying conditions for the fibrous substrate (pad), e.g. cotton pad, prior to the application of the cleansing lotion.
- the use of an overdried fibrous substrate (pad) helps to fix the cleansing lotion on the surface to which it has been applied. It is one benefit of the method of manufacturing the skin-cleansing article (pad) that, after the application of the lotion, no drying step is required. This simplifies the process, saves energy and allows the use of ingredients that are sensitive to heat.
- the skin-cleansing article according to the invention comprises in one embodiment the cleansing lotion in an amount of 0.1 to 1.2 g, preferably in an amount of 0.15 to 1.0 g, more preferably in an amount of 0.20 to 0.8 g, per 1 g of the fibrous substrate (which may have reached its equilibrium moisture content or is overdried as explained above).
- the lotion comprised by the skin-cleansing article of the invention comprises
- a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, preferably a polyglycerol-based emulsifier, and
- the non-ionic emulsifier comprised in the surfactant (mixture) is preferably selected from the following surfactant and emulsifier types.
- the surfactant mixture to be used preferably includes (only) non-ionic surfactants or a mixture of non-ionic surfactants and amphoteric surfactants.
- the non-ionic surfactant can be selected from any non-ionic surfactant including e.g. ester-linked non-ionic surfactants, ether-bonded non-ionic surfactants and amide-linked non-ionic surfactants.
- the ester-linked non-ionic surfactants include e.g. esters of glycol and fatty acid, esters of glycerol and fatty acid, esters of polyglycerol and fatty acid, esters of polyethylene glycol and fatty acid (these are mixtures of mono- and di-esters obtained by the reaction of ethylene oxide with a fatty acid or a mixture of fatty acids.
- ethylene oxide glycol also referred to as "polyoxyethylene” (POE) may vary), esters of sucrose and fatty acid, esters of sucrose and triglyceride esters (sometimes called “sucroglycerides”), esters of sorbitan and fatty acid (surfactants with a lipophilic tendency), polyoxyethylene (POE) sorbitan esters, polyoxyethylene sorbitan esters (POE sorbitan esters are sometimes called polysorbates or esters of polyoxyalkylene polyols).
- Ether-bonded non-ionic surfactants include ethers of POE and alkylphenol (they are also called “polyoxyethylenated alkylphenol”), ethers of POE and fatty alcohol (“polyoxyethylenated alcohols").
- Amide-linked non-ionic surfactants include polyoxyethylenated alkylamides.
- the non-ionic surfactant is preferably selected from polyglycerol-based emulsifiers.
- the lotion comprises preferably 15 to 40 wt.-%, more preferably 20 to 30 wt.-% of non-ionic emulsifier, preferably of the at least one polyglycerol-based emulsifier, e.g. one, two or three different polyglycerol-based emulsifiers.
- the non-ionic emulsifier preferably the polyglycerol-based emulsifier has a hydrophilic- lipophilic balance (HLB) value equal to or greater than 9, preferably equal to or greater than 10, more preferably equal to or greater than 12, for instance of about 14.
- HLB hydrophilic- lipophilic balance
- the hydrophilic-lipophilic balance of a surfactant is a measure of the degree to which it is hydrophilic or lipophilic and can be determined by calculating values for the different regions of the molecule, as described by William C. Griffin in 1949 (Journal of the Society of Cosmetic Chemists, 1 (5): 311-26) and 1954 (Journal of the Society of Cosmetic Chemists, 5 (4): 249-56).
- the HLB values provided in this application are preferably understood as the values obtained by the Griffin calculation method.
- the person skilled in the art is able to select from known non-ionic surfactants those showing the required HLB values.
- the corresponding values can also be found in cosmetic handbooks, for instance Karlheinz Schrader, Kunststoffn und Japaneseuren der Kosmetika, Huthig Verlag, 2 nd Editon, 1989.
- the fatty acid residue typically has a carbon number ranging from 8 to 26.
- the polyglycerol-based emulsifier (al) is preferably an ester of a fatty acid and a polyglycerol as alcohol component.
- the polyglycerol has on average, at least 2 glycerol units, preferably 2 to 6 units, e.g. 2 to 4 glycerol units, e.g. and the ester preferably includes 2 to 8, preferably 2 to 6, repeating units of glycerol.
- the ester is preferably derived from a fatty acid having a number of carbon atoms of 8 to 16, preferably 8 to 12.
- the polyglycerol-based emulsifier is preferably selected from the group consisting of polyglyceryl-4 caprate (available as "Tegosoft PC 41 MB” available from Evonik), polyglyceryl-4 caprylate/caprate, polyglyceryl-4 laurate, polyglyceryl-4 cocoate, polyglyceryl-4 myristate, polyglyceryl-4 palmitate, polyglyceryl-6 caprate, polyglyceryl-6 caprylate/caprate, polyglyceryl-6 laurate, polyglyceryl-6 cocoate, polyglyceryl-6 myristate, polyglyceryl-6 palmitate, polyglyceryl-10 caprylate/caprate (available as "Syneth C15 K RSPO MB" from Lonza), and mixtures thereof.
- polyglyceryl-4 caprate available as "Tegosoft PC 41 MB” available from Evonik
- polyglyceryl-4 caprylate/caprate polyglyceryl-4 laurate, polygly
- polyglycerol-based surfactants are preferred over other type of non-ionic surfactants since, as a rule, the resulting lotions show at least one, typically all of the following favorable properties: (i) they have very little or no odor, (ii) do not cause any yellowing of the lotion, and (iii) leave no sticky feeling on the skin of the user.
- the surfactant system (a) to be used may further comprise (a2) one or more surfactants selected from amphoteric surfactants and non-ionic surfactants other than the polyglycerol-based emulsifier (al). If present, 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants (a2) may be used. These can enhance foam formation and thereby cleansing efficacy.
- the non-ionic surfactants other than the polyglycerol-based emulsifier may be selected from alkyl polyglucosides.
- These C8-C16 fatty alcohol-glucoside may be caprylyl/capryl glucoside (C8) available as Plantacare 810UP, decyl glucoside (CIO) or "lauryl glycoside” including fatty alcohols ranging from C12-C16.
- amphoteric surfactants include betaine surfactants, amino propionate surfactants and glycinates.
- betaine surfactants for example cocamidopropyl betaine, alkyl betaines, alkyl bisbetaines, alkyl dimethyl betaines, alkyl amido betaines, alkyl amido propyl betaines, alkyl amido propyl dimethyl betaine, alkyl amido propyl dimethyl sulfobetaines, alkyl amido propyl hydroxy sultaines, sulfo amido betaines, and sulfo betaines may be used.
- the amphoteric surfactants are preferably selected from alkyl betaines (such as alkyl betaines comprising alkyl residues having 12 to 18 C atoms, e.g. coco betaine, lauryl betaine or myristyl betaine), alkyl amidobetaines, and alkyl sulfobetaines; alkyl imidazolines.
- amino acid-derived surfactants may be used as amphoteric surfactants.
- Suitable amphoteric surfactants include amino propionate derivatives such as alkyl aminopropionates, alkyl ampho polycarboxy propionates, ampho propionates, ampho carboxy propionates, alkyl iminodipropionates, amino alkanoates, beta-N-alkylalanines, alkyl amino propionates, alkyl iminodipropionates, and imino dialkanoate propionates.
- amphoteric surfactant (a2) is preferably selected from alkyl betaines.
- the skin-cleansing lotion further comprises a hydrophilic solvent (b).
- the term "hydrophilic” is meant to include solvents that are fully water-miscible with water at room temperature (20°C) and form homogeneous aqueous mixtures.
- the hydrophilic solvent (b) is preferably selected from polyhydroxy alcohols, more preferably aliphatic mono- or di-hydroxy alcohols. It is preferably selected from propylene glycol, such as 1,2- propylene glycol (propanediol), butylene glycol, pentylene glycol, caprylyl glycol, and mixtures thereof.
- One function of the hydrophilic solvent is to dissolve the non-ionic emulsifier, in particular polyglycerol-based emulsifier. It is preferably used in amounts of 20 to 60 wt.-%, preferably 30 to 55 wt.-%, e.g. 35 to 50 wt.-%.
- the skin-cleansing lotion may optionally also include a humectant which protects the skin against dehydration and may also increase the softness of the lotion-treated surface of the pad.
- humectants include: glycerol, polyalkylene glycols, e.g. polyethylene glycol or polypropylene glycol, for instance polyethylene glycol having a weight average molecular weight of from about 200 to 600; neopentyl alcohols such as pentaerythritol or neopentyl glycol; sugar alcohols such as threitol, erythritol, adonitol (ribitol), arabitol, xylitol, dulcitol, mannitol and sorbitol, carbohydrates such as D (+)- glucose, D (+)- fructose, D (+)- galactose, D (+)- mannose, L-gulose, saccharose, galactose, maltose, polyglycerols, polyoxypropylene adducts of glycerol, methoxypolyethylene glycol, polyethylene glycol ethers of sugar alcohols
- Hyaluronic acid may also be used as humectant.
- Humectants being liquid at room temperature (20°C) are preferred.
- One more preferred humectant is glycerol.
- the humectant can also be used to adjust the viscosity of the final lotion.
- the viscosity of the final lotion (25°C) is preferably 50 to 300 mPa.s, more preferably 100 mPa.s to 200 mPa.s (measured with a Brookfield LV viscosimeter)
- the cleansing lotion includes a humectant
- the hydrophilic solvent has a lower viscosity at 20°C than the humectant.
- the viscosity of the humectant is at least 500 cP (mPa x s) while the viscosity of the hydrophilic solvent is lower than 500 cP (mPa x s), each measured with a Brookfield viscometer LV-DV-I (torque: 10-90%) or, if applicable, other suitable conditions recommended by the manufacturer of the viscosimeter.
- the viscosity of the humectant (25°C) is at least 750 cP (mPa x s), preferably at least 1000 cP (mPa x s), e.g. at least 1200 cP (mPa x s).
- the viscosity of the hydrophilic solvent is lower than 250 cP (mPa x s), preferably lower than 150 cP (mPa x s), e.g. lower than 100 cP (mPa x s).
- the cleansing lotion comprises:
- the cleansing lotion comprises:
- the cleansing lotion used in the above embodiments (El) and (E2) does not comprise any further ingredients, except for water.
- the cleansing lotion is free of oil and wax components.
- oil components refers to hydrophobic liquid components that are not miscible with water at room temperature.
- oil components include but are not limited to oils from plant sources (e.g. glyceride-based oils), mineral oils (e.g. hydrocarbon-based oils), or synthetic oils (e.g. silicone oils or fatty acid ester oils).
- the cleansing lotion may further comprise 0.1 to 5 wt.-%, e.g. 0.5 to 2 wt.-% additives.
- Suitable additives may be selected from known cosmetically acceptable additives, including
- pH adjusting components such as buffering substances, e.g. mixtures of water- soluble organic acids and their corresponding salts (e.g. citric acid/citrate salt);
- cosmetic agents preferably from natural sources (plant extracts), having for instance a skin-soothing, antiphlogistic (reduction of skin irritation), cellregenerating, anti-inflammatory and/or anti-itch effect such as allantoin; aloe vera extract; chamomile extract containing azulene and a-bisabolol; echinacea; dragosantanol; panthenol; liquorice root extract containing 18-glycyrrhetinic acid; lime tree extract containing quercetin and/or glyco-rutin; marigold (calendula oil); urea; phytosterols, optionally ethoxylated (available from Henkel under the tradename "Generol”); chitosan (acetylated chitin); anthocyanidins; ginkgo leaf extract containing quercetin and rutin; horse chestnut containing quercetin and campherol; vitamins or provitamins such as provitamin B5 or Vitamin
- gelling agent used e.g. to adjust the viscosity of the lotion
- the cleansing lotion is free of fragrance since this will increase the consumer acceptance in respect to a composition as "natural” as possible. For similar reasons, dyes may be omitted from the lotion composition.
- the cleansing lotion may be free of cosmetic agents and/or gelling agents.
- the present invention also relates to a process for cleansing the skin and/or removing makeup from the skin. This process comprises the steps of:
- the present invention also relates to the use of this skincleansing article for cleansing the skin and/or removing makeup.
- the present invention provides a cleansing lotion (El) comprising: (al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier,
- (a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
- the cleansing lotion of the invention comprises:
- the above cleansing lotion of the invention (see embodiments (El) and (E2)), which is preferably used in the skin-cleansing article (pad) of the invention, preferably shows the features described herein and the claims for the cleansing lotion to be applied to the substrate (pad).
- the water activity was determined with a hygrometer Testo 645 (available from Testo GmbH, Austria) and a pressure-tight precision humidity probe device (available from Testo GmbH, Austria; ref. 0628 0024).
- the sample to be tested i.e. lotion or finished product
- the sample was placed in an oven at 25°C for 4 hours prior to the measurement.
- the sample was placed in a sample bowl provided with the humidity probe device: the lotion was poured into the bowl, and the finished product was cut in small strips and filled into the bowl.
- the filled sample bowl was introduced into the measurement chamber of the device.
- the device was closed and allowed to stand for 20 min for stabilization.
- the value of the relative humidity is measured, and the water activity is calculated therefrom (the value of the water activity is obtained by dividing the value of the relative humidity by 100).
- the measurement is repeated in triplicate.
- the sample bowl is cleaned and dried between each measurement.
- a mixture was obtained by stirring a mixture of DEHYTON AB 30/MB (manufactured by BASF SE) and citric acid monohydrate (manufactured by Gamma Chimica S.p.A.) for 30 min until citric acid monohydrate was dissolved (stirrer: Ystral, 600-1000 rpm, about 30min). Trisodium citrate dihydrate (manufactured by Jungbunzlauer Suisse AG) was then added to the mixture and stirred for 1 hour, until sodium citrate dihydrate was completely dissolved.
- the water content in the lotion was about 9.7 wt.-%.
- the water activity of the lotion as such was 0.39 (at 23 ⁇ 1°C) and that of the finished product 0.56 (at 23 ⁇ 1°C). Due to the small water content in the lotion, it was not necessary to add preservatives.
- the target viscosity of the lotion was 150 ⁇ 50cP (mPa x s) measured at 20°C (Brookfield viscometer LV-DV-I, spindle 1, velocity lOOrpm).
- the prepared lotion was applied by slot-die coating at room temperature onto one surface of a cotton pad (210 g/m 2 ) in an amount of 50 g/m 2 (total amount of lotion per pad: 0.2505g).
- the cotton pad (100% cotton fibers) had a rectangular shape (ca. 6 x 8.5cm; 0.00501 m 2 ) with two outer card layers and one thick intermediate cotton fluff layer (made by a pneumatic method) interposed therebetween.
- the surface treated with the lotion was a card layer post-processed by hydroentanglement. It displayed a clearly visible texture formed by hollow depressions (striae), in the form of parallel straight grooves (visible lines parallel to the short edge), which were 2.5 mm mutually spaced apart.
- the opposite surface layer was also a card layer subjected to hydroentanglement, however at a lower pressure (30bar instead of 40bar). It comprised a pattern of fine lines (spacing about 0.6mm).
- the target strength values of the untreated pad were about 19N (MD) and 8N (CD), respectively, with corresponding minimum values of 10N (MD) and 4N (CD). This pad was made in a similar manner as described in US 2003/0104036 Al.
- the non-woven cotton pad was slightly overdried and contained 7 wt.-% of water. Thus, the water content in the finished product was 7.5 wt.-%. The finished product had a pleasant dry touch. No further drying was necessary.
- micellar lotion formed which had the composition shown below in Table 2.
- the dilution factor was thus about 13 as seen by comparing e.g. the concentration of polyglycerol-based emulsifier in the lotion as applied (24.3 wt.-%) with its concentration after the addition of water (1.87 wt.-%).
- Example 3 Preparation of skin-cleansing pad A skin-cleansing pad was prepared in a similar manner as described in Example 1 except for treating a small round pad (grammage 210g/m2, size 25.504cm ⁇ , weight 0.5356g and diameter 57mm) with 0.12 g of the cleansing lotion described in example 1. The impregnation rate was 47g/m ⁇ .
- the lotioned pads prepared in example 3 were tested in regard to their cleansing efficiency in makeup removal after the cleansing lotion had been activated by adding 2 g of tap water to each pad ("moistened pad"). Makeups were applied on five different zones of forearms of five volunteers as shown in following Table 3. No hydrating cream was used before the application of the makeup. Following the application of the makeup and a 5-minute pause thereafter (for drying), the cleansing test was carried out by passing the moistened pad five times over the skin in one direction.
- Cleansing efficiency of the moistened pad was measured on the forearm by using a CM- 700d spectrophotometer equipped with the software Spectra Magic NX (both available from Konica Minolta).
- the skin-cleansing pad of Example 1 was tested over a period of one month as to whether unacceptable changes of its appearance, color, odor or pH could be noticed.
- the testing conditions included 20 to 25°C (no RH), natural light, storage in an oven at 40°C (no RH), storage in an oven at 50°C (no RH) and storage at 4°C.
- the skin-cleansing pad passed all tests. Further, no unwanted bacterial growth was observed in any of the tested samples.
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Abstract
The invention relates to a skin-cleansing article comprising a fibrous substrate treated with a skin-cleansing lotion. The skin-cleansing lotion includes a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, preferably a polyglycerol-based5 emulsifier, and a hydrophilic solvent such as propylene glycol. The skin-cleansing article has a water content of less than 15 wt.-%. Upon contact with water, the skin-cleansing lotion forms an aqueous micellar lotion effective in removing makeup from the skin.
Description
Skin-cleansing pad treated with a cleansing lotion suitable for makeup removal
The present invention relates to a skin-cleansing pad suitable for makeup removal which carries a cleansing lotion that can be activated by moisturizing it with water.
BACKGROUND OF THE INVENTION
In the field of cosmetics or baby care, a fibrous pad based on cotton optionally mixed with other synthetic or artificial fibers, onto which is deposited a suitable cleansing or makeupremoving lotion or emulsion, depending on the case, is generally used for cleansing the skin.
Articles pre-impregnated with lotion or emulsion, which can be used directly without the need to add additional cleansing or makeup-removing products at the time of use, are commercially available.
US 2011/0302734 Al describes a skin-cleansing article comprising a fibrous substrate and a cleansing composition that is activated by moistening with water followed by a mechanical action so as to obtain a cleansing foam, wherein the cleansing composition comprises at least one surfactant and a humectant, and the amount of water on the substrate is less than 25% by weight of the article.
In view of the available art, there is a continued demand for skin-cleansing pads that effectively remove makeup from the skin without causing any adverse reactions on the skin. It is further desired that such pads can be easily produced from starting materials that are either natural and/or, as far as possible, biodegradable.
SUMMARY OF THE INVENTION
It is one object of the present invention to provide a skin-cleansing article able to effectively remove various types of makeup from the human skin. It is one further object of the invention to provide a skin-cleansing article with a low irritation potential for the human skin. It is one further object that the skin-cleansing article to be provided shows a suitable shelf life even in the absence of preservatives. Further technical objects will become apparent from the following description of the invention and embodiments thereof.
The present invention relates to a skin-cleansing article, which is disposable after use. The article comprises a pad made of a fibrous material forming a substrate, and a lotion with a substantially dry feel on the substrate. Specifically, the invention relates to a skincleansing article comprising a fibrous substrate, wherein the fibrous substrate is a pad having a basis weight of 100 g/m2 to 350 g/m2 and comprising or consisting of cellulosic fibers, preferably cotton fibers. The fibrous substrate comprises a cleansing lotion comprising:
(a) a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, preferably a polyglycerol-based emulsifier, and
(b) a hydrophilic solvent; the water content of the skin-cleansing article being less than 15 wt.-%, preferably less than 10 wt.-%, more preferably less than 9 wt.-%, e.g. less than 8 wt.-%, based on the total weight of the article.
The present invention thus relates to the following embodiments (items):
1. A skin-cleansing article comprising a fibrous substrate, wherein the fibrous substrate is a pad having a basis weight of 100 g/m2 to 350 g/m2 and comprising or consisting of cellulosic fibers, preferably cotton fibers; and wherein the fibrous substrate comprises a cleansing lotion comprising:
(a) a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, and
(b) a hydrophilic solvent; the water content of the skin-cleansing article being less than 15 wt.-%, preferably less than 10 wt.-%, more preferably less than 9 wt.-%, e.g. less than 8 wt.-%, based on the total weight of the article.
2. The skin-cleansing article according to item 1, wherein the at least one non-ionic emulsifier is selected from (al) polyglycerol-based emulsifiers.
3. The skin-cleansing article according to item 1 or 2, wherein the cleansing lotion comprises (al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier, based on the total weight of the cleansing lotion.
4. The skin-cleansing article according to any one of items 1 to 3, wherein the fibrous substrate has two outer surfaces and the skin-cleansing article is obtained by applying the cleansing lotion to one outer surface.
5. The skin-cleansing article according to any one of items 1 to 4, wherein the cleansing lotion has a water content of less than 20 wt.-%, preferably less than 15 wt.-%, more preferably less than 10 wt.-%, based on the total weight of the cleansing lotion.
6. The skin-cleansing article according to any one of items 1 to 5, wherein the skincleansing article comprises the cleansing lotion in an amount of 0.1 to 1.2 g, preferably in an amount of 0.15 to 1.0 g, more preferably in an amount of 0.20 to 0.8 g, per 1 g of the fibrous substrate.
7. The skin-cleansing article according to any one of items 1 to 6, wherein the pad comprises two outer layers joined together and at least one outer layer has a surface with a texture defined thereupon.
8. The skin-cleansing article according to any one of items 1 to 7, wherein the fibrous substrate comprises up to 30 wt.-% of synthetic fibers, preferably up to 20 wt.-% of synthetic fibers, more preferably up to 10 wt.-% of synthetic fibers, and even more preferably up to 5 w.-% of synthetic fibers, based on the total weight of the fibrous substrate, the remainder being natural cellulosic fibers such as cotton fibers; wherein the synthetic fibers are preferably selected from viscose fibers, polyester fibers, polypropylene fibers, and mixtures thereof.
9. The skin-cleansing article according to any one of items 1 to 8, wherein the fibrous substrate has one or more selected from the following properties:
(i) a basis weight of 125 g/m2 to 275 g/m2, preferably 150 g/m2 to 250 g/m2;
(ii) a tensile strength in the dry state of at least 10 N, preferably at least 15N in the machine direction (MD);
(iii) a tensile strength in the dry state of at least 4N, preferably at least 7N in the cross direction (CD).
10. The skin-cleansing article according to any one of items 1 to 9, wherein the nonionic surfactant, preferably polyglycerol-based emulsifier (al) has a hydrophilic-lipophilic balance (HLB) value equal to or greater than 9, preferably equal to or greater than 10, more preferably equal to or greater than 12, for instance of about 14.
11. The skin-cleansing article according to any of items 1 to 10, wherein the non-ionic surfactant is a polyglycerol-based emulsifier (al) comprising an ester of a fatty acid and a polyglycerol, the ester including on average 2 to 8, preferably 2 to 6, repeating units of glycerol and being derived from a fatty acid having a number of carbon atoms of 8 to 16, preferably 8 to 12.
12. The skin-cleansing article according to any one of items 1 to 11, wherein the surfactant system (a) further comprises (a2) one or more surfactants selected from amphoteric surfactants and non-ionic surfactants, preferably from alkyl betaines, alkyl amidobetaines, alkyl sulfobetaines, alkyl imidazolines, and amino acid-derived surfactants, more preferably from alkyl betaines.
13. The skin-cleansing article according to any one of items 1 to 12, wherein the hydrophilic solvent (b) comprises a polyhydroxy alcohol, preferably a mono- or dihydroxyl alcohol, more preferably propylene glycol such as 1,2-propylene glycol, butylene glycol, pentylene glycol, caprylyl glycol, and mixtures thereof.
14. The skin-cleansing article according to any one of items 1 to 13, wherein the cleansing lotion comprises:
(al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier,
(a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
(b) 20 to 60 wt.-%, preferably 30 to 55 wt.-% of the hydrophilic solvent,
(c) 1 to 20 wt.-%, preferably 5 to 15 wt.-% water,
(d) optionally 1 to 30 wt.-%, preferably 10 to 25 wt.-% of a humectant which differs from the hydrophilic solvent,
(e) optionally 0.1 to 5 wt.-% additives, each based on the total weight of the cleansing lotion.
15. The skin-cleansing article according to item 14, wherein the cleansing lotion comprises:
(al) 20 to 30 wt.-% of polyglyceryl-4 caprate as emulsifier,
(a 2) 2 to 6 wt.-% of one or more alkyl betaine surfactants,
(b) 30 to 55 wt.-% of a hydrophilic solvent selected from di-hydroxyl alcohols, preferably 1,2-propylene glycol,
(c) 5 to 15 wt.-% water,
(d) 10 to 25 wt.-% of a humectant which is not a di-hydroxyl alcohol, preferably glycerol,
(e) optionally 0.1 to 5 wt.-% additives.
16. The skin-cleansing article according to any one of items 1 to 15, wherein the cleansing lotion is free of oil and wax components.
17. Process for cleansing the skin and/or removing makeup on skin comprising the steps of:
(a) activating the skin-cleansing and/or care article according to any one of claims 1 to 16 by moistening with water, and
(P) rubbing the activated article on the skin to clean the skin and/or remove makeup on skin.
18. Use of a skin-cleansing article according to any one of items 1 to 16 for cleansing the skin and/or removing makeup.
19. Cleansing lotion comprising:
(al) 15 to 40 wt.-%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier,
(a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
(b) 20 to 60 wt.-%, preferably 30 to 55 wt.-% of a water-miscible hydrophilic solvent,
(c) 1 to 20 wt.-%, preferably 5 to 15 wt.-% water,
(d) optionally 1 to 30 wt.-%, preferably 10 to 25 wt.-% of a humectant which differs from the water-miscible hydrophilic solvent,
(e) optionally 0.1 to 5 wt.-% additives, each based on the total amount of cleansing lotion.
20. Cleansing lotion according to item 19 comprising:
(al) 20 to 30 wt.-% of polyglyceryl-4 caprate as emulsifier,
(a 2) 2 to 6 wt.-% of one or more alkyl betaine surfactants,
(b) 30 to 55 wt.-% of a hydrophilic solvent selected from di-hydroxyl alcohols, preferably 1,2-propylene glycol,
(c) 5 to 15 wt.-% water,
(d) 10 to 25 wt.-% of a humectant which is not a di-hydroxyl alcohol, preferably glycerol,
(e) optionally 0.1 to 5 wt.-% additives.
21. Cleansing lotion according to item 19 or 20 wherein the polyglycerolbased emulsifier is as defined in item 10 or 11.
Where the present description refers to preferred embodiments/features, combinations of these preferred embodiments/features shall also be deemed as disclosed, as long as this combination of preferred embodiments/features is technically meaningful.
Hereinafter, the use of the term "comprising" or "including" should be understood as disclosing, and as a more restricted embodiment, the term "consisting of', as well, as long as this is technically meaningful.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a skin-cleansing article comprising a fibrous substrate, wherein the fibrous substrate is a pad having a basis weight of 100 g/m2 to 350 g/m2 and comprising or consisting of cellulosic fibers, preferably natural cellulosic fibers such as cotton fibers; and wherein the fibrous substrate comprises a cleansing lotion comprising:
(a) a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, preferably a polyglycerol-based emulsifier, and
(b) a hydrophilic solvent; the water content of the skin-cleansing article being less than 15 wt.-%, preferably less than 10 wt.-%, more preferably less than 9 wt.-%, e.g. less than 8 wt.-%, based on the total weight of the article.
Due to the relatively low water content, the lotion and thus also the skin-cleansing article (in the following also referred to as "skin-cleansing pad") has a substantially dry appearance and feel. The cleansing lotion is activated by moistening the pad with water. It is possible to determine the water content in the lotion composition by conducting a water determination according to Karl Fischer. If the total water content of the skincleansing article is to be determined the skin-cleansing article can be extracted with suitable organic solvents, such as water-free ethanol, followed by the water determination of the ethanol extract according to Karl Fischer. If any water remains in the fibrous substrate after the extraction this can be determined by conventional methods (e.g. by drying in an oven at 50°C until its weight no longer changes and determining the weight loss) and added to the water content determined by Karl Fischer.
Typically, the user adds an amount of water which leads for instance to a 5-fold to 20- fold, e.g. 10-fold to 15-fold dilution of the cleansing lotion. By adding this amount of water, the skin-cleansing pad is normally fully impregnated with the diluted lotion.
The relatively low amounts of non-ionic emulsifier, preferably polyglycerol-based emulsifier, resulting from this degree of dilution, are sufficient to form micelles which enhance the cleansing action of the lotion. The micelles will emulsify any oil present on the skin of the user. Accordingly, in one embodiment of the invention, the user of the skin-cleansing pad is instructed to use an amount of water which leads to a concentration of the non-ionic emulsifier, preferably polyglycerol-based emulsifier, above the critical micelle concentration (CMC) of the respective emulsifier. As "micelle" we understand, in accordance with the usual understanding in the art, an aggregate of the emulsifier (surfactant) molecules dispersed in a liquid (here the aqueous lotion phase). A typical micelle in aqueous solution forms an aggregate with the hydrophilic "head" regions in contact with surrounding solvent, sequestering the hydrophobic single-tail regions in the micelle center.
In addition, depending on the type of surfactants included, foam may be formed when the pad is subjected to a mechanical action, such as bending or rubbing. This is however not essential for the cleansing action.
The pad impregnated with the diluted and activated lotion is then applied to the areas of skin that are to be cleansed. Depending on the ingredients of the lotion, it may also exert a skincare effect.
In accordance with the present invention, the form and size of the skin-cleansing pad is not particularly limited, as long as it is suitable for the targeted application.
The shape may be circular, oval, polygonal or some other shape, and the sizes may range from 25 to more than 100 cm2. In one embodiment the pads are circular and have a diameter ranging from 4 to 7 cm, for instance 5 to 6 cm. In a further embodiment of the invention the pads have a rectangular shape and size ranging from e.g. 40 to 60 cm2, e.g. 45 to 55 cm2. The basis weights are generally between 100 and 350 g/m2.
An embodiment of the invention is directed towards pads obtained from a lap of fibrous material made only of cotton or cotton mixed with other optionally chopped fibers. Generally, the fibers of the lap are entangled so as to form a nonwoven arrangement of greater or lesser mechanical strength depending on the strength requirements of the article.
A fibrous pad intended for cleansing the skin, and in particular for the removal of makeup, is chosen for its beneficial properties. It is thick enough to be held comfortably in the hand when it is moistened. It absorbs and wipes away impurities. It conserves its form during use, on rubbing. It does not form fluff and does not leave fibers on the skin.
In one embodiment, the substrate of the skin-cleansing pad is a lap comprising or consisting of cellulosic fibers, e.g. cotton fibers, comprising three fiber (e.g. cotton) layers, two exterior layers and one central layer, characterized in that the exterior layers, between which the central layer is interposed, are card webs. Further, the central layer comprises laminated cellulosic fibers (e.g. cotton fibers) oriented substantially obliquely between the two planes formed by the exterior layers. This lap is preferably obtained by a continuous process including the steps of superimposing the three layers and subjecting them to a scouring treatment, a bleaching treatment and then a rinsing treatment, to impart to the layers a very good mutual cohesion. This type of pad and its manufacture is described in EP 0 681 621.
Further, the mechanical properties of the pads can be improved by using either one or both of the following two techniques:
1. incorporation into the mass of fibers of a meltable binder (in the form of fibers or powder), with heating with hot air or hot calendering; the binder agglomerates the cotton fibers when it is melted and then cooled, and affords an increase in
strength of the pads in the three dimensions. However, this technique is not applicable to products that are intended to be made only of cellulose fibers;
2. treatment of the lap of fibers via mechanical means, preferably using waterjets in a hydroentangling process, which interlace the fibers in the bulk and at the surface.
One preferred embodiment of the invention relates to a fibrous substrate (pad) obtained according to the above second technique. The hydroentangling process (water-jet entangling) makes it possible to reduce the surface pilling capacity and to increase the tensile strength of the lap. This process, which is purely mechanical, allows the manufacture of laps composed up to 100% of cellulosic fibers (e.g. cotton fibers). This process is further described in US 2011/0302734 Al.
The use of hydroentangling processes preferably forms a relief at the surface of the pads which generally results from compression of the fibers either under the effect of embossing or calendering, or under the effect of a hydroentanglement process intended to join several laps of fibers together.
Accordingly, in one preferred embodiment, the pad to be used in the present invention, comprises two outer layers joined together, wherein at least one outer layer has a surface with a texture defined thereupon. In accordance with this embodiment, the shape and arrangement of this surface texture is not particularly limited. Examples of a suitable surface texture formed on at least one surface of the pad include continuous straight lines, in particular parallel lines, continuous curved lines, a square-mesh grid or a lozengeshaped grid.
The average distance (height) between the raised parts of the surface texture and the depressions between these raised parts may e.g. be between 0.1 and 1.0 mm, e.g. between 0.2 and 0.5 mm.
In one preferred embodiment, as described in US 2003/0104036 Al (=WO01/42548), except for the strength values, the pad to be used in the present invention, is a hydrophilic cotton pad used for skin-care and exhibiting a specific surface weight of at least 150 g/m2, comprising two different outer sides of which the fibers are hydroentangled, characterized in that the first outer side comprises a texture formed by hollow depressions, e.g. striae, mutually apart by a spacing si which is between 1 and 8 mm and a depression (e.g. striae) depth D of at least 0.25 mm, e.g. at least 0.40 mm or at least
0.50 mm, and wherein the pad's tensile strength is at least 10 N, preferably at least 15N in the direction of motion (MD) and at least 4N, preferably at least 7N, in the direction transverse thereto (CD), as determined by the testing procedure described in the specification. In one aspect of this hydrophilic cotton pad, the first outer side comprises hollow depressions (e.g. striae) at least 50% of the pad fibers are entangled. In one further aspect, the spacing si between the depressions (e.g.) striae of the first side is between 1.2 and 5.5 mm and preferably between 2 and 4 mm. This pad can be further described by the feature(s) defined in claims 5 to 8 and the specification of US 2003/0104036 Al.
In one further preferred embodiment of the invention, the pad has at least one surface having a raised pattern defined thereupon, said skin care pad comprising: (a) at least two outer layers of absorbent fibrous material joined together; and (b) at least one series of yarns placed between said outer layers, characterized in that the thickness of at least one of the outer layers is less than the average diameter of the yams. The central layer interposed between the two outer layers preferably includes cellulosic fibers, such as cotton fibers.
Such pads and their manufacture are disclosed in US 2009/0068409 Al. Preferably, the raised pattern has protrusions of height H (as defined in US 2009/0068409 Al) between 0.2 and 2.0 mm, in particular between 0.3 and 0.5 mm.
Compared to conventional hydroentangling processes, the method of US 2009/0068409 Al allows obtaining recesses or reliefs of large amplitude.
In accordance with embodiments of the present invention, the shape and arrangement of the raised pattern is not particularly limited. Examples of raised patterns formed at the surface of the pad include continuous straight lines, in particular parallel lines, continuous curved lines, a square-mesh grid or a lozenge-shaped grid, of the type shown in Figures 2A to 2D of US 2009/0068409,
According to one particular aspect of this method, bonding of the outer layers is carried out by means of a technique chosen from hydroentanglement, glueing and hot-melt bonding (thermobonding), the choice of the technique depending on the fiber mixture used for the inner layer(s).
The fibrous substrate (pad) to be used has a basis weight of 100 g/m2 to 350 g/m2, preferably 175 g/m2 to 275 g/m2, more preferably 200 g/m2 to 250 g/m2. It comprises or consists of cellulosic fibers, preferably cotton fibers.
Suitable cellulosic fibers, in particular natural cellulosic fibers, can be selected from "primary" fibrous materials (e.g. raw pulps) or secondary fibrous materials, whereby a "secondary" fibrous material includes recycled fibers. The primary fibrous materials may relate both to a chemically digested pulp and to mechanical pulp such as thermorefiner mechanical pulp (TMP), chemothermorefiner mechanical pulp (CTMP) or high temperature chemithermomechanical pulp (HTCTMP). Fibers of softwood (usually originating from conifers), hardwood (usually originating from deciduous trees) or from cotton linters can be used for example. Fibers from esparto (alfa) grass, bagasse (cereal straw, rice straw, bamboo, hemp), kemp fibers, flax, and other woody and cellulosic fiber sources can also be used as raw materials. Preference is given to the use of natural fibers such as cotton fibers. The cellulosic fibers, preferably cotton fibers can be bleached or unbleached. The cellulosic fibers to be used are preferably "natural" cellulosic fibers, i.e. cellulosic fibers originating from plants which have not been subjected to any regeneration process wherein the cellulosic material is dissolved and regenerated in fibrous form. The term "natural" therefore also includes secondary, in particular recycled fibers.
In one embodiment the fibrous substrate (pad) comprises less than 50 wt.-% of synthetic fibers, preferably up to 30 wt.-% of synthetic fibers, more preferably up to 20 wt.-% of synthetic fibers, e.g. up to 10 wt.-% of synthetic fibers, or up to 5 w.-% of synthetic fibers, based on the total weight of the fibrous substrate. The synthetic fibers are preferably selected from synthetic fibers such as viscose fibers, polyester fibers, polypropylene fibers, and mixtures thereof. If the fibers are to be thermobonded, polyester fibers and/or polypropylene fibers or mixtures thereof with viscose fibers are preferably used.
The fibrous substrate (pad) preferably shows one or more of following properties:
(i) a basis weight of 175 g/m2 to 275 g/m2, more preferably 200 g/m2 to 250 g/m2;
(ii) a tensile strength in the dry state of at least 10 N, preferably at least 15N, e.g. at least 20 N in the machine direction (MD), as measured in US 2003/0104036 Al (=WO 01/42548);
(iii) a tensile strength in the dry state of at least 4N, preferably at least 7N, e.g. at least 16 N in the cross direction (CD), as measured in US 2003/0104036 Al;
The fibrous substrate (pad) has two outer surfaces. The skin-cleansing article is preferably obtained by applying the cleansing lotion to one outer surface (the treated outer surface). In this embodiment, the cleansing lotion does not fully impregnate the fibrous substrate but rather is present on the treated outer surface in a greater amount than on the other outer surface. This inhomogeneous distribution of cleansing lotion can also be described as a concentration gradient with the greatest amount of cleansing lotion being present on the treated outer surface. In accordance with this embodiment, it is also preferred to provide a fibrous substrate (pad) in which the treated surface forms a visible relief at the surface or a has a visible raised pattern obtainable by the aforementioned techniques. "Visible" means in this context discernible with the naked eye. This relief or pattern constitutes a visible signal to the user of the skin-cleansing article that the outer surface carrying the same is more effective in cleansing the skin. This brings along the additional benefit that the treated surface comprising the greater amount of cleansing lotion is brought into contact with the skin of the user.
The application technique for the cleansing lotion is selected from suitable, preferably contact-free, application techniques known in the art such as die coating (slot-die coating) and spray coating. The benefit of slot-die coating is that it is highly scalable and suitable for rapidly depositing thin and uniform films with minimal material waste and lower operational costs.
The water content of the skin-cleansing article is less than 15 wt.-%, preferably less than 10 wt.-%, more preferably less than 9 wt.-%, e.g. less than 8 wt.-%, based on the total weight of the article. This relatively low water amount is advantageous since it makes it possible to dispense with the use of preservatives, such as antibacterial components in the cleansing lotion. Accordingly, in one embodiment of the invention the cleansing lotion is free of preservatives, such as antibacterial actives. As explained later in more detail, in this embodiment, pH adjusting compounds, such as organic acids or buffering compound including organic acids, which also may have an antibacterial effect can however be used. The pH of the lotion is preferably 3.0 to 5.0, more preferably 3.5. to 4.5, e.g. pH = 4.0 + 0.2.
The above amount of water can be obtained by suitably adjusting the amount of water in the fibrous substrate (pad) and/or cleansing lotion. Against this background, it is preferred that the cleansing lotion to be applied to the fibrous substrate (pad) has a water content of less than 20 wt.-%, preferably less than 15 wt.-%, more preferably less than 10 wt.-%, based on the total weight of the cleansing lotion.
The water activity of the finished skin-cleansing article (inclusive lotion) is preferably less than 0,7, more preferably less than 0.65, e.g. less than 0.6 (each measured at 23±1°C as described in the examples).
In one embodiment of the invention, the fibrous substrate (pad), for instance a pad fully made of cotton (in the following also referred to as "cotton pad") is slightly overdried before the cleansing lotion is applied thereto (note: the term "cotton pad" does not exclude the presence of any (synthetic) yarns possibly used to provide one surface thereof with a visible pattern in accordance with the aforementioned techniques). The term "overdried" means in this context that the moisture content of the fibrous substrate (pad) is lower than that obtainable by storing the pad at room temperature (20°C) and humidity (40-50%) until the equilibrium moisture content has been reached. For instance, in the case of cotton pads, the equilibrium moisture content is about 8% wt.-% and an "overdried" pad may have a moisture content of 5 to 7 wt.-%, e.g. 7 wt.-%. A moisture content lower than the equilibrium moisture content can be obtained by suitably adapting the manufacturing conditions and/or drying conditions for the fibrous substrate (pad), e.g. cotton pad, prior to the application of the cleansing lotion. The use of an overdried fibrous substrate (pad) helps to fix the cleansing lotion on the surface to which it has been applied. It is one benefit of the method of manufacturing the skin-cleansing article (pad) that, after the application of the lotion, no drying step is required. This simplifies the process, saves energy and allows the use of ingredients that are sensitive to heat.
The skin-cleansing article according to the invention comprises in one embodiment the cleansing lotion in an amount of 0.1 to 1.2 g, preferably in an amount of 0.15 to 1.0 g, more preferably in an amount of 0.20 to 0.8 g, per 1 g of the fibrous substrate (which may have reached its equilibrium moisture content or is overdried as explained above).
The lotion comprised by the skin-cleansing article of the invention comprises
(a) a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, preferably a polyglycerol-based emulsifier, and
(b) a hydrophilic solvent.
The non-ionic emulsifier comprised in the surfactant (mixture) is preferably selected from the following surfactant and emulsifier types.
The surfactant mixture to be used preferably includes (only) non-ionic surfactants or a mixture of non-ionic surfactants and amphoteric surfactants.
The non-ionic surfactant can be selected from any non-ionic surfactant including e.g. ester-linked non-ionic surfactants, ether-bonded non-ionic surfactants and amide-linked non-ionic surfactants.
• The ester-linked non-ionic surfactants include e.g. esters of glycol and fatty acid, esters of glycerol and fatty acid, esters of polyglycerol and fatty acid, esters of polyethylene glycol and fatty acid (these are mixtures of mono- and di-esters obtained by the reaction of ethylene oxide with a fatty acid or a mixture of fatty acids. The number of ethylene oxide glycol, also referred to as "polyoxyethylene" (POE) may vary), esters of sucrose and fatty acid, esters of sucrose and triglyceride esters (sometimes called "sucroglycerides"), esters of sorbitan and fatty acid (surfactants with a lipophilic tendency), polyoxyethylene (POE) sorbitan esters, polyoxyethylene sorbitan esters (POE sorbitan esters are sometimes called polysorbates or esters of polyoxyalkylene polyols).
• Ether-bonded non-ionic surfactants include ethers of POE and alkylphenol (they are also called "polyoxyethylenated alkylphenol"), ethers of POE and fatty alcohol ("polyoxyethylenated alcohols").
• Amide-linked non-ionic surfactants include polyoxyethylenated alkylamides.
The non-ionic surfactant is preferably selected from polyglycerol-based emulsifiers. The lotion comprises preferably 15 to 40 wt.-%, more preferably 20 to 30 wt.-% of non-ionic emulsifier, preferably of the at least one polyglycerol-based emulsifier, e.g. one, two or three different polyglycerol-based emulsifiers.
The non-ionic emulsifier, preferably the polyglycerol-based emulsifier has a hydrophilic- lipophilic balance (HLB) value equal to or greater than 9, preferably equal to or greater than 10, more preferably equal to or greater than 12, for instance of about 14. The hydrophilic-lipophilic balance of a surfactant is a measure of the degree to which it is hydrophilic or lipophilic and can be determined by calculating values for the different regions of the molecule, as described by William C. Griffin in 1949 (Journal of the Society of Cosmetic Chemists, 1 (5): 311-26) and 1954 (Journal of the Society of Cosmetic Chemists, 5 (4): 249-56). The HLB values provided in this application are preferably understood as the values obtained by the Griffin calculation method.
The person skilled in the art is able to select from known non-ionic surfactants those showing the required HLB values. For commonly used surfactants the corresponding values can also be found in cosmetic handbooks, for instance Karlheinz Schrader, Grundlagen und Rezepturen der Kosmetika, Huthig Verlag, 2nd Editon, 1989.
In non-ionic surfactants including a fatty acid component, the fatty acid residue typically has a carbon number ranging from 8 to 26. By suitably combining a fatty acid component with a shorter or longer fatty acid chain with a more or less hydrophilic surfactant portion the skilled person is able to adjust the required HLB values for a suitable non-ionic surfactant.
The polyglycerol-based emulsifier (al) is preferably an ester of a fatty acid and a polyglycerol as alcohol component. The polyglycerol has on average, at least 2 glycerol units, preferably 2 to 6 units, e.g. 2 to 4 glycerol units, e.g. and the ester preferably includes 2 to 8, preferably 2 to 6, repeating units of glycerol. The ester is preferably derived from a fatty acid having a number of carbon atoms of 8 to 16, preferably 8 to 12. The polyglycerol-based emulsifier is preferably selected from the group consisting of polyglyceryl-4 caprate (available as "Tegosoft PC 41 MB" available from Evonik), polyglyceryl-4 caprylate/caprate, polyglyceryl-4 laurate, polyglyceryl-4 cocoate, polyglyceryl-4 myristate, polyglyceryl-4 palmitate, polyglyceryl-6 caprate, polyglyceryl-6 caprylate/caprate, polyglyceryl-6 laurate, polyglyceryl-6 cocoate, polyglyceryl-6 myristate, polyglyceryl-6 palmitate, polyglyceryl-10 caprylate/caprate (available as "Syneth C15 K RSPO MB" from Lonza), and mixtures thereof.
According to the studies already conducted, polyglycerol-based surfactants are preferred over other type of non-ionic surfactants since, as a rule, the resulting lotions show at least one, typically all of the following favorable properties: (i) they have very little or no odor, (ii) do not cause any yellowing of the lotion, and (iii) leave no sticky feeling on the skin of the user.
The surfactant system (a) to be used may further comprise (a2) one or more surfactants selected from amphoteric surfactants and non-ionic surfactants other than the polyglycerol-based emulsifier (al). If present, 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants (a2) may be used. These can enhance foam formation and thereby cleansing efficacy.
The non-ionic surfactants other than the polyglycerol-based emulsifier may be selected from alkyl polyglucosides. In one embodiment, a C8-C16 fatty alcohol-glucoside can be used, for instance fatty alcohol-glucoside (average number of sugar units x = 1.4), which can be obtained from BASF under the tradename Plantacare®. These C8-C16 fatty alcohol-glucoside may be caprylyl/capryl glucoside (C8) available as Plantacare 810UP, decyl glucoside (CIO) or "lauryl glycoside" including fatty alcohols ranging from C12-C16.
Suitable examples of amphoteric surfactants include betaine surfactants, amino propionate surfactants and glycinates.
As betaine surfactants, for example cocamidopropyl betaine, alkyl betaines, alkyl bisbetaines, alkyl dimethyl betaines, alkyl amido betaines, alkyl amido propyl betaines, alkyl amido propyl dimethyl betaine, alkyl amido propyl dimethyl sulfobetaines, alkyl amido propyl hydroxy sultaines, sulfo amido betaines, and sulfo betaines may be used. The amphoteric surfactants are preferably selected from alkyl betaines (such as alkyl betaines comprising alkyl residues having 12 to 18 C atoms, e.g. coco betaine, lauryl betaine or myristyl betaine), alkyl amidobetaines, and alkyl sulfobetaines; alkyl imidazolines.
Further, amino acid-derived surfactants may be used as amphoteric surfactants. Suitable amphoteric surfactants include amino propionate derivatives such as alkyl aminopropionates, alkyl ampho polycarboxy propionates, ampho propionates, ampho carboxy propionates, alkyl iminodipropionates, amino alkanoates, beta-N-alkylalanines, alkyl amino propionates, alkyl iminodipropionates, and imino dialkanoate propionates.
The amphoteric surfactant (a2) is preferably selected from alkyl betaines.
The skin-cleansing lotion further comprises a hydrophilic solvent (b). The term "hydrophilic" is meant to include solvents that are fully water-miscible with water at room temperature (20°C) and form homogeneous aqueous mixtures. The hydrophilic solvent (b) is preferably selected from polyhydroxy alcohols, more preferably aliphatic mono- or di-hydroxy alcohols. It is preferably selected from propylene glycol, such as 1,2- propylene glycol (propanediol), butylene glycol, pentylene glycol, caprylyl glycol, and mixtures thereof.
One function of the hydrophilic solvent is to dissolve the non-ionic emulsifier, in particular polyglycerol-based emulsifier. It is preferably used in amounts of 20 to 60 wt.-%, preferably 30 to 55 wt.-%, e.g. 35 to 50 wt.-%.
The skin-cleansing lotion may optionally also include a humectant which protects the skin against dehydration and may also increase the softness of the lotion-treated surface of the pad.
Examples of suitable humectants include: glycerol, polyalkylene glycols, e.g. polyethylene glycol or polypropylene glycol, for instance polyethylene glycol having a weight average molecular weight of from about 200 to 600; neopentyl alcohols such as pentaerythritol or neopentyl glycol; sugar alcohols such as threitol, erythritol, adonitol (ribitol), arabitol, xylitol, dulcitol, mannitol and sorbitol, carbohydrates such as D (+)- glucose, D (+)- fructose, D (+)- galactose, D (+)- mannose, L-gulose, saccharose, galactose, maltose, polyglycerols, polyoxypropylene adducts of glycerol, methoxypolyethylene glycol, polyethylene glycol ethers of sugar alcohols, such as sorbitol, polyethylene glycol ethers of glycerol, and combinations thereof. Hyaluronic acid may also be used as humectant. Humectants being liquid at room temperature (20°C) are preferred. One more preferred humectant is glycerol. The humectant can also be used to adjust the viscosity of the final lotion. The viscosity of the final lotion (25°C) is preferably 50 to 300 mPa.s, more preferably 100 mPa.s to 200 mPa.s (measured with a Brookfield LV viscosimeter)
If the cleansing lotion includes a humectant, the same differs from the hydrophilic solvent which sometimes may also possess humectant properties. Further, in one embodiment, the hydrophilic solvent has a lower viscosity at 20°C than the humectant. In one aspect of this embodiment the viscosity of the humectant is at least 500 cP (mPa x s) while the viscosity of the hydrophilic solvent is lower than 500 cP (mPa x s), each measured with a Brookfield viscometer LV-DV-I (torque: 10-90%) or, if applicable, other suitable conditions recommended by the manufacturer of the viscosimeter. In further embodiments of the invention, the viscosity of the humectant (25°C) is at least 750 cP (mPa x s), preferably at least 1000 cP (mPa x s), e.g. at least 1200 cP (mPa x s). In further embodiments of the invention, the viscosity of the hydrophilic solvent is lower than 250 cP (mPa x s), preferably lower than 150 cP (mPa x s), e.g. lower than 100 cP (mPa x s).
In one preferred embodiment (El), the cleansing lotion comprises:
(al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier,
(a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
(b) 20 to 60 wt.-%, preferably 30 to 55 wt.-% of a hydrophilic solvent,
(c) 1 to 20 wt.-%, preferably 5 to 15 wt.-% water,
(d) optionally 1 to 30 wt.-%, preferably 10 to 25 wt.-% of a humectant which differs from the hydrophilic solvent,
(e) optionally 0.1 to 5 wt.-% additives, each based on the total weight of the cleansing lotion.
In one further preferred embodiment (E2), the cleansing lotion comprises:
(al) 20 to 30 wt.-% of polyglyceryl-4 caprate as emulsifier,
(a 2) 2 to 6 wt.-% of one or more alkyl betaine surfactants,
(b) 30 to 55 wt.-% of a hydrophilic solvent selected from di-hydroxyl alcohols, preferably 1,2-propylene glycol,
(c) 5 to 15 wt.-% water,
(d) 10 to 25 wt.-% of a humectant which is not a di-hydroxyl alcohol, preferably glycerol,
(e) optionally 0.1 to 5 wt.-% additives.
In one aspect of the invention, the cleansing lotion used in the above embodiments (El) and (E2) does not comprise any further ingredients, except for water.
In one further embodiment, the cleansing lotion is free of oil and wax components. The term "oil components" refers to hydrophobic liquid components that are not miscible with water at room temperature. Such oil components include but are not limited to oils from plant sources (e.g. glyceride-based oils), mineral oils (e.g. hydrocarbon-based oils), or synthetic oils (e.g. silicone oils or fatty acid ester oils).
The cleansing lotion may further comprise 0.1 to 5 wt.-%, e.g. 0.5 to 2 wt.-% additives. Suitable additives may be selected from known cosmetically acceptable additives, including
• pH adjusting components, such as buffering substances, e.g. mixtures of water- soluble organic acids and their corresponding salts (e.g. citric acid/citrate salt);
• cosmetic agents, preferably from natural sources (plant extracts), having for instance a skin-soothing, antiphlogistic (reduction of skin irritation), cellregenerating, anti-inflammatory and/or anti-itch effect such as allantoin; aloe
vera extract; chamomile extract containing azulene and a-bisabolol; echinacea; dragosantanol; panthenol; liquorice root extract containing 18-glycyrrhetinic acid; lime tree extract containing quercetin and/or glyco-rutin; marigold (calendula oil); urea; phytosterols, optionally ethoxylated (available from Henkel under the tradename "Generol"); chitosan (acetylated chitin); anthocyanidins; ginkgo leaf extract containing quercetin and rutin; horse chestnut containing quercetin and campherol; vitamins or provitamins such as provitamin B5 or Vitamin E; avocado oil; birch extract; arnica; extract of rose of Sharon or St. John's wort; cucumber, hops, or hamamelis extracts or ingredients, ethoxylated quaternary amines;
• fragrance;
• gelling agent used e.g. to adjust the viscosity of the lotion; and
• dyes.
In one preferred embodiment, the cleansing lotion is free of fragrance since this will increase the consumer acceptance in respect to a composition as "natural" as possible. For similar reasons, dyes may be omitted from the lotion composition. Likewise, the cleansing lotion may be free of cosmetic agents and/or gelling agents.
The present invention also relates to a process for cleansing the skin and/or removing makeup from the skin. This process comprises the steps of:
(a) activating the skin-cleansing article described herein and the claims by moistening the same with water, and
(P) rubbing the activated article on the skin to clean the skin and/or remove makeup present on the skin.
In one further embodiment, the present invention also relates to the use of this skincleansing article for cleansing the skin and/or removing makeup.
Further, in one aspect, the present invention provides a cleansing lotion (El) comprising: (al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier,
(a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
(b) 20 to 60 wt.-%, preferably 30 to 55 wt.-% of a hydrophilic solvent,
(c) 1 to 20 wt.-%, preferably 5 to 15 wt.-% water,
(d) optionally 1 to 30 wt.-%, preferably 10 to 25 wt.-% of a humectant which differs from the hydrophilic solvent,
(e) optionally 0.1 to 5 wt.-% additives, each based on the total weight of the cleansing lotion.
In one further preferred embodiment (E2), the cleansing lotion of the invention comprises:
(al) 20 to 30 wt.-% of polyglyceryl-4 caprate as emulsifier,
(a 2) 2 to 6 wt.-% of one or more alkyl betaine surfactants,
(b) 30 to 55 wt.-% of a hydrophilic solvent selected from di-hydroxyl alcohols, preferably 1,2-propylene glycol,
(c) 5 to 15 wt.-% water,
(d) 10 to 25 wt.-% of a humectant which is not a di-hydroxyl alcohol, preferably glycerol,
(e) optionally 0.1 to 5 wt.-% additives.
The above cleansing lotion of the invention (see embodiments (El) and (E2)), which is preferably used in the skin-cleansing article (pad) of the invention, preferably shows the features described herein and the claims for the cleansing lotion to be applied to the substrate (pad). In other words, all features and feature combinations that are described in this patent (application) for the lotion to be applied to the substrate, be they preferred or not, can also be used to further describe and characterize the claimed lotion as such.
Experimental Section
Test methods
The water activity was determined with a hygrometer Testo 645 (available from Testo GmbH, Austria) and a pressure-tight precision humidity probe device (available from Testo GmbH, Austria; ref. 0628 0024). The sample to be tested, i.e. lotion or finished product, was placed in an oven at 25°C for 4 hours prior to the measurement. The sample was placed in a sample bowl provided with the humidity probe device: the lotion was poured into the bowl, and the finished product was cut in small strips and filled into the bowl. The filled sample bowl was introduced into the measurement chamber of the device. The device was closed and allowed to stand for 20 min for stabilization. The value of the relative humidity is measured, and the water activity is calculated therefrom (the
value of the water activity is obtained by dividing the value of the relative humidity by 100). The measurement is repeated in triplicate. The sample bowl is cleaned and dried between each measurement.
Example 1: Preparation of skin-cleansing pad for makeup removal
Preparation of Lotion
A mixture was obtained by stirring a mixture of DEHYTON AB 30/MB (manufactured by BASF SE) and citric acid monohydrate (manufactured by Gamma Chimica S.p.A.) for 30 min until citric acid monohydrate was dissolved (stirrer: Ystral, 600-1000 rpm, about 30min). Trisodium citrate dihydrate (manufactured by Jungbunzlauer Suisse AG) was then added to the mixture and stirred for 1 hour, until sodium citrate dihydrate was completely dissolved. Zemea Propanediol (manufactured by DuPont Tate & Lyle Bio Products Co., LLC), glycerol (manufactured by Gamma Chimica S.p.A.) and TEGOSOFT PC 41MB (Evonik Industries AG) were then further added to the mixture with 5 minutes mixing between each addition. Finally, pH was adjusted to pH = 4.0 + 0.2 by adding citric acid monohydrate (manufactured by Gamma Chimica S.p.A.). The contents of the ingredients used in the prepared lotion are shown below in Table 1. Polyglyceryl-4 caprate present in TEGOSOFT PC 41MB has an HLB of 14 (according to the information provided by the manufacturer).
The water content in the lotion was about 9.7 wt.-%. The water activity of the lotion as such was 0.39 (at 23±1°C) and that of the finished product 0.56 (at 23±1°C). Due to the small water content in the lotion, it was not necessary to add preservatives.
The target viscosity of the lotion was 150 ± 50cP (mPa x s) measured at 20°C (Brookfield viscometer LV-DV-I, spindle 1, velocity lOOrpm).
The prepared lotion was applied by slot-die coating at room temperature onto one surface of a cotton pad (210 g/m2) in an amount of 50 g/m2 (total amount of lotion per pad: 0.2505g).
The cotton pad (100% cotton fibers) had a rectangular shape (ca. 6 x 8.5cm; 0.00501 m2) with two outer card layers and one thick intermediate cotton fluff layer (made by a pneumatic method) interposed therebetween.
The surface treated with the lotion was a card layer post-processed by hydroentanglement. It displayed a clearly visible texture formed by hollow depressions (striae), in the form of parallel straight grooves (visible lines parallel to the short edge), which were 2.5 mm mutually spaced apart. The opposite surface layer was also a card layer subjected to hydroentanglement, however at a lower pressure (30bar instead of 40bar). It comprised a pattern of fine lines (spacing about 0.6mm). The target strength values of the untreated pad were about 19N (MD) and 8N (CD), respectively, with corresponding minimum values of 10N (MD) and 4N (CD). This pad was made in a similar manner as described in US 2003/0104036 Al.
The non-woven cotton pad was slightly overdried and contained 7 wt.-% of water. Thus, the water content in the finished product was 7.5 wt.-%. The finished product had a pleasant dry touch. No further drying was necessary.
Example 2: Activation of Lotion
To activate the lotion 3g of water were added to each pad. When the pad was rubbed against the skin a micellar lotion formed which had the composition shown below in Table 2.
The dilution factor was thus about 13 as seen by comparing e.g. the concentration of polyglycerol-based emulsifier in the lotion as applied (24.3 wt.-%) with its concentration after the addition of water (1.87 wt.-%).
Example 3: Preparation of skin-cleansing pad A skin-cleansing pad was prepared in a similar manner as described in Example 1 except for treating a small round pad (grammage 210g/m2, size 25.504cm^, weight 0.5356g and diameter 57mm) with 0.12 g of the cleansing lotion described in example 1. The impregnation rate was 47g/m^.
Example 4: Activation and Makeup removal
The lotioned pads prepared in example 3 were tested in regard to their cleansing efficiency in makeup removal after the cleansing lotion had been activated by adding 2 g
of tap water to each pad ("moistened pad"). Makeups were applied on five different zones of forearms of five volunteers as shown in following Table 3. No hydrating cream was used before the application of the makeup. Following the application of the makeup and a 5-minute pause thereafter (for drying), the cleansing test was carried out by passing the moistened pad five times over the skin in one direction.
Cleansing efficiency (in %) for makeup types applied to zones 1 to 5
Cleansing efficiency of the moistened pad was measured on the forearm by using a CM- 700d spectrophotometer equipped with the software Spectra Magic NX (both available from Konica Minolta).
The cleansing efficiency is shown for each makeup type in the above table 3. The results show that the makeups were removed with good cleansing efficiencies by using the moistened pad.
Visual evaluation for Mascara (Zone 4)
The cleansing result for the mascara (Zone 4) was also inspected visually and scored according to the following:
1: good efficiency / 2: some little traces of mascara left / 3: 50% mascara left / 4: more than 50% of mascara left / 5: no efficiency.
The score for Zone 4 was 1.05, indicating that the mascara was removed with good efficiency with the moistened pad. Example 5: Stability tests
The skin-cleansing pad of Example 1 was tested over a period of one month as to whether unacceptable changes of its appearance, color, odor or pH could be noticed. The testing conditions included 20 to 25°C (no RH), natural light, storage in an oven at 40°C (no RH), storage in an oven at 50°C (no RH) and storage at 4°C. The skin-cleansing pad passed all tests. Further, no unwanted bacterial growth was observed in any of the tested samples.
Claims
1. A skin-cleansing article comprising a fibrous substrate, wherein the fibrous substrate is a pad having a basis weight of 100 g/m2 to 350 g/m2 and comprising or consisting of cellulosic fibers, preferably cotton fibers; and wherein the fibrous substrate comprises a cleansing lotion comprising:
(a) a surfactant or surfactant mixture comprising at least one non-ionic emulsifier, and
(b) a hydrophilic solvent; the water content of the skin-cleansing article being less than 15 wt.-%, preferably less than 10 wt.-%, more preferably less than 9 wt.-%, e.g. less than 8 wt.-%, based on the total weight of the article.
2. The skin-cleansing article according to claim 1, wherein the at least one non-ionic emulsifier is selected from (al) polyglycerol-based emulsifiers.
3. The skin-cleansing article according to claim 1 or 2, wherein the cleansing lotion comprises (al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier, based on the total weight of the cleansing lotion.
4. The skin-cleansing article according to any one of claims 1 to 3, wherein the fibrous substrate has two outer surfaces and the skin-cleansing article is obtained by applying the cleansing lotion to one outer surface.
5. The skin-cleansing article according to any one of claims 1 to 4, wherein the cleansing lotion has a water content of less than 20 wt.-%, preferably less than 15 wt.-%, more preferably less than 10 wt.-%, based on the total weight of the cleansing lotion.
6. The skin-cleansing article according to any one of claims 1 to 5, wherein the skincleansing article comprises the cleansing lotion in an amount of 0.1 to 1.2 g, preferably in an amount of 0.15 to 1.0 g, more preferably in an amount of 0.20 to 0.8 g, per 1 g of the fibrous substrate.
7. The skin-cleansing article according to any one of claims 1 to 6, wherein the pad comprises two outer layers joined together and at least one outer layer has a surface with a texture defined thereupon.
27
8. The skin-cleansing article according to any one of claims 1 to 7, wherein the fibrous substrate comprises up to 30 wt.-% of synthetic fibers, preferably up to 20 wt.-% of synthetic fibers, more preferably up to 10 wt.-% of synthetic fibers, and even more preferably up to 5 w.-% of synthetic fibers, based on the total weight of the fibrous substrate, the remainder being natural cellulosic fibers such as cotton fibers; wherein the synthetic fibers are preferably selected from viscose fibers, polyester fibers, polypropylene fibers, and mixtures thereof.
9. The skin-cleansing article according to any one of claims 1 to 8, wherein the fibrous substrate has one or more selected from the following properties:
(i) a basis weight of 125 g/m2 to 275 g/m2, preferably 150 g/m2 to 250 g/m2;
(ii) a tensile strength in the dry state of at least 10 N, preferably at least 15N in the machine direction (MD);
(iii) a tensile strength in the dry state of at least 4N, preferably at least 7N in the cross direction (CD).
10. The skin-cleansing article according to any one of claims 1 to 9, wherein the nonionic surfactant, preferably polyglycerol-based emulsifier (al) has a hydrophilic-lipophilic balance (HLB) value equal to or greater than 9, preferably equal to or greater than 10, more preferably equal to or greater than 12, for instance of about 14.
11. The skin-cleansing article according to any of claims 1 to 10, wherein the non-ionic surfactant is a polyglycerol-based emulsifier (al) comprising an ester of a fatty acid and a polyglycerol, the ester including on average 2 to 8, preferably 2 to 6, repeating units of glycerol and being derived from a fatty acid having a number of carbon atoms of 8 to 16, preferably 8 to 12.
12. The skin-cleansing article according to any one of claims 1 to 11, wherein the surfactant system (a) further comprises (a2) one or more surfactants selected from amphoteric surfactants and non-ionic surfactants, preferably from alkyl betaines, alkyl amidobetaines, alkyl sulfobetaines, alkyl imidazolines, and amino acid-derived surfactants, more preferably from alkyl betaines.
13. The skin-cleansing article according to any one of claims 1 to 12, wherein the hydrophilic solvent (b) comprises a polyhydroxy alcohol, preferably a mono- or dihydroxyl alcohol, more preferably propylene glycol such as 1,2-propylene glycol, butylene glycol, pentylene glycol, caprylyl glycol, and mixtures thereof.
14. The skin-cleansing article according to any one of claims 1 to 13, wherein the cleansing lotion comprises:
(al) 15 to 40 wt.%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier,
(a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
(b) 20 to 60 wt.-%, preferably 30 to 55 wt.-% of the hydrophilic solvent,
(c) 1 to 20 wt.-%, preferably 5 to 15 wt.-% water,
(d) optionally 1 to 30 wt.-%, preferably 10 to 25 wt.-% of a humectant which differs from the hydrophilic solvent,
(e) optionally 0.1 to 5 wt.-% additives, each based on the total weight of the cleansing lotion.
15. The skin-cleansing article according to claim 14, wherein the cleansing lotion comprises:
(al) 20 to 30 wt.-% of polyglyceryl-4 caprate as emulsifier,
(a 2) 2 to 6 wt.-% of one or more alkyl betaine surfactants,
(b) 30 to 55 wt.-% of a hydrophilic solvent selected from di-hydroxyl alcohols, preferably 1,2-propylene glycol,
(c) 5 to 15 wt.-% water,
(d) 10 to 25 wt.-% of a humectant which is not a di-hydroxyl alcohol, preferably glycerol,
(e) optionally 0.1 to 5 wt.-% additives.
16. The skin-cleansing article according to any of claims 1 to 15, wherein the cleansing lotion is free of oil and wax components.
17. Process for cleansing the skin and/or removing makeup on skin comprising the steps of:
(a) activating the skin-cleansing and/or care article according to any one of claims 1 to 16 by moistening with water, and
(P) rubbing the activated article on the skin to clean the skin and/or remove makeup on skin.
18. Use of a skin-cleansing article according to any one of claims 1 to 16 for cleansing the skin and/or removing makeup.
19. Cleansing lotion comprising:
(al) 15 to 40 wt.-%, preferably 20 to 30 wt.-% of at least one polyglycerol-based emulsifier,
(a2) optionally 1 to 15 wt.-%, preferably 2 to 6 wt.-% of one or more surfactants selected from non-ionic surfactants other than polyglycerol-based emulsifier and amphoteric surfactants,
(b) 20 to 60 wt.-%, preferably 30 to 55 wt.-% of a water-miscible hydrophilic solvent,
(c) 1 to 20 wt.-%, preferably 5 to 15 wt.-% water,
(d) optionally 1 to 30 wt.-%, preferably 10 to 25 wt.-% of a humectant which differs from the water-miscible hydrophilic solvent,
(e) optionally 0.1 to 5 wt.-% additives, each based on the total amount of cleansing lotion.
20. Cleansing lotion according to claim 19 comprising:
(al) 20 to 30 wt.-% of polyglyceryl-4 caprate as emulsifier,
(a 2) 2 to 6 wt.-% of one or more alkyl betaine surfactants,
(b) 30 to 55 wt.-% of a hydrophilic solvent selected from di-hydroxyl alcohols, preferably 1,2-propylene glycol,
(c) 5 to 15 wt.-% water,
(d) 10 to 25 wt.-% of a humectant which is not a di-hydroxyl alcohol, preferably glycerol,
(e) optionally 0.1 to 5 wt.-% additives.
21. Cleansing lotion according to claim 19 or 20 wherein the polyglycerol-based emulsifier is as defined in claim 10 or 11.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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PCT/EP2020/078086 WO2022073602A1 (en) | 2020-10-07 | 2020-10-07 | Skin-cleansing pad treated with a cleansing lotion suitable for makeup removal |
EP20789056.7A EP4225258A1 (en) | 2020-10-07 | 2020-10-07 | Skin-cleansing pad treated with a cleansing lotion suitable for makeup removal |
Applications Claiming Priority (1)
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PCT/EP2020/078086 WO2022073602A1 (en) | 2020-10-07 | 2020-10-07 | Skin-cleansing pad treated with a cleansing lotion suitable for makeup removal |
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WO2022073602A1 true WO2022073602A1 (en) | 2022-04-14 |
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PCT/EP2020/078086 WO2022073602A1 (en) | 2020-10-07 | 2020-10-07 | Skin-cleansing pad treated with a cleansing lotion suitable for makeup removal |
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WO (1) | WO2022073602A1 (en) |
Citations (8)
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EP0681621A1 (en) | 1993-01-29 | 1995-11-15 | James River | Hydrophilic cotton lap and products obtained by processing same |
CA2332948A1 (en) * | 1998-04-24 | 1999-11-04 | The Procter & Gamble Company | Cleansing articles for skin and/or hair which also deposits skin care actives |
EP1024785A1 (en) * | 1997-10-24 | 2000-08-09 | The Procter & Gamble Company | Cleansing and conditioning article for skin or hair having improved fragrance delivery |
WO2001042548A2 (en) | 1999-12-07 | 2001-06-14 | Georgia-Pacific France | Hydrophilic cotton pad for skin care and comprising two different external surfaces |
WO2004058214A1 (en) * | 2002-12-20 | 2004-07-15 | The Procter & Gamble Company | Cloth-like personal care articles |
US20090068409A1 (en) | 2007-08-17 | 2009-03-12 | Georgia-Pacific France | Skin cleansing and/or care article having a raised pattern at its surface and method of manufacturing said article |
US20110302734A1 (en) | 2009-02-13 | 2011-12-15 | Georgia-Pacific France | Item for cleaning the skin |
CN111329813A (en) * | 2020-04-26 | 2020-06-26 | 浙江维雅化妆品有限公司 | PEG-free eye and lip makeup remover and preparation method thereof |
-
2020
- 2020-10-07 WO PCT/EP2020/078086 patent/WO2022073602A1/en active Search and Examination
- 2020-10-07 EP EP20789056.7A patent/EP4225258A1/en active Pending
Patent Citations (9)
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EP0681621A1 (en) | 1993-01-29 | 1995-11-15 | James River | Hydrophilic cotton lap and products obtained by processing same |
EP1024785A1 (en) * | 1997-10-24 | 2000-08-09 | The Procter & Gamble Company | Cleansing and conditioning article for skin or hair having improved fragrance delivery |
CA2332948A1 (en) * | 1998-04-24 | 1999-11-04 | The Procter & Gamble Company | Cleansing articles for skin and/or hair which also deposits skin care actives |
WO2001042548A2 (en) | 1999-12-07 | 2001-06-14 | Georgia-Pacific France | Hydrophilic cotton pad for skin care and comprising two different external surfaces |
US20030104036A1 (en) | 1999-12-07 | 2003-06-05 | Philippe Gregoire | Hydrophilic cotton pad for skin care comprising two different external surfaces |
WO2004058214A1 (en) * | 2002-12-20 | 2004-07-15 | The Procter & Gamble Company | Cloth-like personal care articles |
US20090068409A1 (en) | 2007-08-17 | 2009-03-12 | Georgia-Pacific France | Skin cleansing and/or care article having a raised pattern at its surface and method of manufacturing said article |
US20110302734A1 (en) | 2009-02-13 | 2011-12-15 | Georgia-Pacific France | Item for cleaning the skin |
CN111329813A (en) * | 2020-04-26 | 2020-06-26 | 浙江维雅化妆品有限公司 | PEG-free eye and lip makeup remover and preparation method thereof |
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Title |
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"Karlheinz Schrader, Grundlagen und Rezepturen der Kosmetika", 1989, HUTHIG VERLAG |
JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS, vol. 5, no. 4, 1954, pages 249 - 56 |
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