Cleansing composition

Abstract

The cleansing composition comprises 25% to 35% by weight of surfactant, 1.5% to 5% by weight of co-surfactant, 5% to 9% by weight of water, and 50% to 60% by weight of a mixture of fatty acid and soap, with the fatty acid to soap ratio being 2.3:1 to 1.8:1. A method of producing the cleansing bar includes heating the cleansing composition to a temperature sufficient to provide a molten composition, cooling the molten composition to form flakes or chips, refining the flakes or chips to form a billet, and punching or cutting the billet to form the cleansing bar. Another method of making the cleansing bar includes heating the cleansing composition to a temperature sufficient to provide a molten composition, pouring the molten composition into a mold, cooling the molten composition until a cleansing bar is formed, and removing the cleansing bar from the mold.

Description

Technical Field

[0001] This specification discloses a cleansing composition. The cleansing composition has less surfactant than other cleansing compositions, provides a mild soap, and has additional advantages. The cleansing composition includes a surfactant, a co-surfactant, water, and a mixture of fatty acids and soap.

Background Art

[0002] Fatty acid soaps are efficient and inexpensive cleansing products, but they can be irritating to the skin. Short chains, for example, C 14 and below, or C 12 and below, and unsaturated long chains, for example, sodium oleate, soaps provide good lathering and detergency, but can be strongly irritating and drying to the skin. Removing the more soluble and more irritating carbon chains from the chain length distribution of the soap can reduce the strength of irritation, but sacrifices properties desired by the consumer during use, such as lathering speed, lathering volume, and quality.

[0003] U.S. Patent Application Publication No. 2006 / 0225285 A1 to Slavtcheff et al. discloses a razor head assembly containing a mild cleansing composition including an acyl isethionate surfactant disposed adjacent to the blade for shaving and protecting the skin. With the isethionate surfactant, the user can perform moisturizing, cleansing, and shaving simultaneously. In a preferred embodiment, a post-shave step may be provided in addition to the cleansing step.

[0004] To obtain a milder bar, some or all of the fatty acid soaps in the composition may be replaced with synthetic surfactants ("sinded" bars). While synthetic surfactants tend to be milder than soaps, they can still be irritating to the skin because their high levels are necessary to achieve the desired lather for consumers. Furthermore, the strong cleansing power of high surfactant levels can hinder the effects that the bar composition is intended to achieve, such as the deposition of fragrances or skin-beneficial ingredients.

[0005] Therefore, there is a continuing need for cleansing compositions that can minimize not only the amount of harsh surfactants but also the total amount of surfactants. Balancing the content of these ingredients provides mildness and improved benefits such as moisturizing and longer-lasting fragrance, while still being processable into bars without sacrificing any user experience. [Overview of the Initiative]

[0006] Cleansing compositions are disclosed in various forms.

[0007] The cleansing composition comprises 25% to 35% by weight of a surfactant, 1.5% to 5% by weight of an auxiliary surfactant, 5% to 9% by weight of water, and 50% to 60% by weight of a mixture of fatty acids and soap. The ratio of fatty acids to soap is 2.3:1 to 1.8:1.

[0008] These and other features and characteristics will be explained in more detail below. [Modes for carrying out the invention]

[0009] The cleansing compositions disclosed herein relate to solid cleansing bar (solid soap) compositions. The cleansing compositions consist of a balanced blend of surfactants, auxiliary surfactants, fatty acids, soaps, and optionally other miscellaneous ingredients. The cleansing compositions are balanced, as described below, because this unique composition offers clinical advantages over compositions known in the market, provides cost benefits (by minimizing surfactants and utilizing stearic acid), and achieves both clinical and cost benefits without sacrificing the lather hedonics expected from compositions using a similar ingredient palette. The cleansing compositions deliver superior skin efficacy without sacrificing consumer experience.

[0010] The ratio of fatty acids to soaps, and the incorporation levels of these two components in the final composition, are important characteristics of the cleansing compositions disclosed herein. Since solid syndets tend to minimize the total surfactant level, fatty acids and soaps constitute a significant portion of the formulation and, by default, significantly contribute to the structure of the composition, and therefore its phase behavior and rheology. An unexpected advantage of this cleansing composition space is the phase behavior of the components in a solid mixture (amalgam). Individual compositions can be processed in a molten state, which is a doughy consistency, or in a molten fluid state (i.e., thin enough to pour). Either the dough or molten fluid state, which is a doughy consistency, can be crystallized, extruded, and further processed into a usable form. A second option for the fluid molten state is that it can be poured into a mold, crystallized, and removed from the mold in a usable form.

[0011] A unique feature of this formulation space is the behavior of the phases in the cleansing composition system. At the mixing temperature (where all materials are in a molten state), the formulation can exist as either a viscous dough or a thin, easily pourable liquid. Such phase behavior is advantageous in that it provides manufacturing flexibility. Doughs at high temperatures (e.g., above 100°C) can be cooled by conventional methods (chill roll, belt peeling, milling, etc.). Liquids at high temperatures (e.g., above 100°C) can also be cooled by the conventional methods described above, but such liquids can be processed via a procedure in which they are poured into a mold after melting, in which case the molten material is poured into a mold and cooled.

[0012] Furthermore, the inclusion of typical soaps, i.e., neutralized fatty acids or saponified oils typical in this art, has been demonstrated to be beneficial without adversely impacting clinical performance. Maintaining the ratio of fatty acids to soaps and achieving the appropriate pH of the final formulation mitigates the negative contributions that soaps would typically have (i.e., irritation, clinically inferior product).

[0013] The cleansing composition may contain a surfactant; specifically, the cleansing composition may contain 25% to 35% by weight of a surfactant. The surfactant may be present in an amount greater than 25% but less than 35% by weight. The surfactant may be present in an amount greater than 26% to 32% by weight.

[0014] The cleansing composition may contain auxiliary surfactants, specifically, a cleansing composition may contain 1.5% to 5% by weight of auxiliary surfactants. The auxiliary surfactant may be present in an amount of 1.5% to 5% by weight or more. The auxiliary surfactant may be present in an amount of 2.0% to 4% by weight, for example, 2.5% to 3.5% by weight.

[0015] The surfactant and / or co-surfactant can be selected from anionic surfactants, zwitterionic surfactants, amphoteric surfactants, or combinations thereof. The following discussion refers to surfactants, co-surfactants, or surfactants and co-surfactants. The surfactant and / or co-surfactant can contain C8-C 18 alkyl groups, for example, C 12 -C 16 alkyl groups, for example, C 10 -C 14 alkyl groups, or mixtures thereof. For example, the surfactant and / or co-surfactant can contain C 10 alkyl groups, C 12 alkyl groups, C 14 alkyl groups, or any combination thereof.

[0016] When present, the anionic surfactant used can include aliphatic sulfonates, such as primary alkane (e.g., C8-C 22 ) sulfonates, primary alkane (e.g., C8-C 22 ) disulfonates, C8-C 22 alkene sulfonates, C8-C 22 hydroxyalkane sulfonates or alkyl glyceryl ether sulfonates (AGS); or aromatic sulfonates, such as alkylbenzene sulfonates. The anionic surfactant can also be an alkyl sulfate (e.g., C 12 -C 18 alkyl sulfate) or an alkyl ether sulfate (including alkyl glyceryl ether sulfate). Among the alkyl ether sulfates, there are those of the formula:

[0017] RO(CH2CH2O) n SO3M

[0018] In the formula, R is an alkyl or alkenyl having 8 to 18 carbon atoms, preferably 12 to 18 carbon atoms; n has an average value of at least 1.0, preferably less than 5, most preferably between 1 and 4; and M is a solubilized cation such as sodium, potassium, ammonium, or substituted ammonium.

[0019] Anionic surfactants also include alkyl sulfosuccinates (mono and dialkyl, e.g., sulfosuccinate C6-C6). 22 Includes; alkyl and acyl taurates (often methyl taurate), alkyl and acyl sarcosinates, sulfoacetates, C8-C 22 Alkyl phosphates and phosphonates, alkyl phosphate esters and alkoxyalkyl phosphate esters, acyl lactates, C8-C 22 These may include monoalkyl succinates and maleates, sulfoacetates, alkyl glucosides and acyl isethionates, etc.

[0020] Sulfosuccinates may be monoalkyl sulfosuccinates having the following formula:

[0021] R 1 OC(O)CH2CH(SO3M)CO2M;

[0022] The formula amide-MEA sulfosuccinate:

[0023] R 1 CONHCH2CH2OC(O)CH2CH(SO3M)CO2M

[0024] (In the formula, R 1 is C8-C 22 (That is the case.)

[0025] In general, sarcosinates are expressed by the following formula:

[0026] R 2 CON(CH3)CH2CO2M (where R 2 is C8-C20 (It is alkyl.)

[0027] Taurate is generally given by the formula:

[0028] R 3 CONR 4 CH2CH2SO3M

[0029] In the formula, R 3 is C8-C 20 It is alkyl, R 4 It is a C1-C4 alkyl group.

[0030] M is the solubilized cation mentioned above.

[0031] The cleansing compositions disclosed herein are C8-C 18 They may contain acyl isethionates. These esters are prepared by reacting alkali metal isethionates with mixed aliphatic fatty acids having 6 to 18 carbon atoms and an iodine value of less than 20. At least 75% of the mixed fatty acids have 12 to 18 carbon atoms, and up to 25% have 6 to 10 carbon atoms.

[0032] The acyl isethionate may be an alkoxylated isethionate, as described in the U.S. patent of Ilardi et al., U.S. Patent No. 5,393,466, title “Fatty Acid Esters of Polyalkoxylated Isetonic Acids”; issued February 28, 1995; incorporated herein by reference. This compound has the general formula:

[0033] R 5 C-(O)OC(X)HC(Y)H-(OCH2-CH2) m -SO3 M

[0034] (In the formula, R 5 (where m is an alkyl group having 8 to 18 carbon atoms, m is an integer from 1 to 4, X and Y are each independently hydrogen atoms or alkyl groups having 1 to 4 carbon atoms, and M is the solubilized cation described above).

[0035] In one embodiment of the cleansing composition, the anionic surfactant used is 2-acrylamido-2-methylpropanesulfonic acid, ammonium lauryl sulfate, ammonium perfluorononanoate, potassium lauryl sulfate, sodium alkyl sulfate, sodium dodecyl sulfate, sodium laurate, sodium laureth sulfate, sodium lauroyl sarcosinate, sodium stearate, sodium sulfosuccinate ester, sodium lauroyl isethionate, or a combination thereof. Such anionic surfactants are commercially available from suppliers such as Galaxy Surfactants, Clariant, Sino Lion, Stepan Company, and Innospec.

[0036] If necessary, amphoteric surfactants may be included in the cleansing compositions disclosed herein. Examples of amphoteric surfactants (which may be amphoteric depending on pH) include sodium acylamphoacetate, sodium acylamphopropionate, disodium acylamphodiacetate, and disodium acylamphodipropionate, where acyl (i.e., alkanoyl group) is C7-C 18 It may contain an alkyl group. Exemplary examples of amphoteric surfactants include sodium lauroamphoacetate, sodium cocoamphoacetate, sodium lauroamphoacetate, or combinations thereof.

[0037] With respect to the amphoteric surfactant used in the cleansing composition of the present invention, such surfactant contains at least one acid group. Such acid group may be a carboxylic acid group or a sulfonic acid group. They often contain a quaternary nitrogen and therefore may be a quaternary amino acid. They generally contain an alkyl or alkenyl group of 7 to 18 carbon atoms and generally follow the overall structural formula:

[0038] R 6 -[-C(O)-NH(CH2) q -] r -N+ (R 7 )(R 8 )-AB

[0039] In the formula, R 6 R is an alkyl or alkenyl molecule with 7 to 18 carbon atoms; 7 and R 8 Each of these is independently an alkyl, hydroxyalkyl, or carboxyalkyl group of 1 to 3 carbon atoms; q is 2 to 4; r is 0 to 1; A is an alkylene group of 1 to 3 carbon atoms which may be substituted with a hydroxyl group, and B is -CO2- or -SO3-.

[0040] A preferred zwitterionic surfactant for use in the cleansing compositions disclosed herein and within the above general formula includes a simple betaine of the following formula:

[0041] R 6 -N + (R 7 )(R 8 )-CH2CO2 -

[0042] Furthermore, it contains amidobetaine, represented by the following formula:

[0043] R 6 -CONH(CH2) t -N + (R 7 )(R 8 )-CH2CO2

[0044] In the formula, t is either 2 or 3.

[0045] In both equations, R 6 , R 7 and R 8 This is as defined earlier. R 6 In particular, base R 6 C derived from coconut oil such that at least half, preferably at least three-quarters, of the carbon atoms have 10 to 14 carbon atoms. 12 and C 14A mixture of alkyl groups may also be used. 7 and R 8 It is preferably methyl.

[0046] Furthermore, the amphoteric surfactant may also be sulfobetaine, as shown in the following formula:

[0047] R 6 -N + (R 7 )(R 8 )-(CH2)3SO3 - or

[0048] R 6 -CONH(CH2) u -N + (R 7 )(R 8 )-(CH2)3SO3 -

[0049] In the formula, u is 2 or 3, or a variant thereof, such as -(CH2)3SO3 - -CH2C(OH)(H)CH2SO3 - This is a replacement.

[0050] In these equations, R 6 , R 7 and R 8 This is as defined earlier.

[0051] Exemplary examples of zwitterionic surfactants that are desirable to use include betaines, e.g., lauryl betaine, citrate betaine, cocodimethylcarboxymethyl betaine, cocoamidopropyl betaine, cocoalkyldimethyl betaine, and laurylamidopropyl betaine. Additional zwitterionic surfactants suitable for use include cocoamidopropyl sultaine, e.g., cocamidopropyl hydroxysultaine. Preferred zwitterionic surfactants include lauryl betaine, citrate betaine, sodium hydroxymethylglycinate, (carboxymethyl)dimethyl-3-[(1-oxododecyl)amino]propylammonium hydroxide, cocoalkyldimethyl betaine, (carboxymethyl)dimethyloleylammonium hydroxide, cocoamidopropyl betaine, (carboxymethyl)dimethyloleylammonium hydroxide, cocoamidopropyl betaine, (carboxyatomethyl)dimethyl(octadecyl)ammonium, cocamidopropyl hydroxysultaine, or combinations thereof. Such surfactants are commercially available from suppliers such as Stepan Company, Solvay, and Evonik, and the use of mixtures of the aforementioned surfactants falls within the scope of the cleansing compositions disclosed herein.

[0052] Nonionic surfactants may, in some cases, be used in cleansing compositions. When used, nonionic surfactants are typically used at low levels of 0.5, 1, 1.5, or 2% by weight, and at high levels of 6, 8, 10, or 12% by weight. Examples of nonionic surfactants that can be used include reaction products of compounds having hydrophobic groups and reactive hydrogen atoms, such as aliphatic alcohols, acids, amides, or alkylphenols, with alkylene oxides, particularly ethylene oxide alone or propylene oxide. Specific nonionic surfactant compounds include alkyl(C6-C) 22 ) Phenol, ethylene oxide condensate, aliphatic (C8-C 18)It is a condensation product of a primary or secondary linear or branched alcohol and ethylene oxide, and a condensation product of ethylene oxide, propylene oxide and ethylenediamine. Other nonionic surfactants include long-chain tertiary amine oxides, long-chain tertiary phosphine oxides, dialkyl sulfoxides, and the like.

[0053] In one embodiment, the nonionic surfactant has the following structure a) HOCH2(CH2) s (CH2CH2O) c H or b) HOOC(CH2) v (CH2CH2O) d H and may include a fatty acid / alcohol ethoxylate, where s and v are each independently an integer up to 18, and c and d are each independently an integer greater than or equal to 1. In one embodiment, s and v can each independently be from 6 to 18, and c and d can each independently be from 1 to 30. Other options for the nonionic surfactant include the formula H i (CH2) i -CH=CH-(CH2) k (CH2CH2O) z H, (where i, k are each independently from 5 to 15, and z is from 5 to 50). In another embodiment, i and k are each independently from 6 to 12; z is from 15 to 35.

[0054] The nonionic surfactant may also include sugar amides such as polysaccharide amides. Specifically, the surfactant may be one of the lactobionamides described in Patent Document 1. U.S. Patent No. 5,389,279 to Au et al., entitled "Compositions Containing Nonionic Glycolipid Surfactants," issued February 14, 1995 (which is incorporated herein by reference), or one of the sugar amides described in U.S. Patent No. 5,009,814 to Kelkenberg, entitled "Use of N-Polyhydroxyalkyl Fatty Acid Amides as Thickeners for Liquid Aqueous Surfactant Systems," issued April 23, 1991, which is incorporated by reference into the present application.

[0055] Examples of nonionic surfactants that may be optionally used in the cleansing compositions disclosed herein include, but are not limited to, polyglycosides, cetyl alcohols, decyl glucosides, lauryl glucosides, octaethylene glycol monododecyl ethers, n-octyl β-d-thioglucopyranosides, octyl glucosides, oleyl alcohols, polysorbates, sorbitan, stearyl alcohols, or combinations thereof.

[0056] In one embodiment, a cationic surfactant can be optionally used in the cleansing composition of this application.

[0057] One class of cationic surfactants includes heterocyclic ammonium salts such as cetyl or stearylpyridinium chloride, alkylamidoethylpyrrolidinium (pyrrylinodium) methyl sulfate, and lapyrium chloride.

[0058] Tetraalkylammonium salts are another useful type of cationic surfactant for use. Examples include cetyl or stearyltrimethylammonium chloride or bromide; hydrogenated palm or tallow trimethylammonium halide; behenyltrimethylammonium halide or methyl sulfate; decylisononyldimethylammonium halide; ditallow (or distearyl)dimethylammonium halide; and behenyldimethylammonium chloride.

[0059] Other types of cationic surfactants that can be used include various ethoxylated quaternary amines and quaternary esters. Examples include PEG-5 stearylammonium lactate (e.g., Genamin KSL from Clariant), PEG-2 cocoammonium chloride, PEG-15 tallow ammonium chloride, PEG-15 stearylammonium chloride, dipalmitoylethylmethylammonium chloride, dipalmitoylhydroxyethylmethyl sulfate, and stearylamidopropyldimethylamine lactate.

[0060] Furthermore, other useful catinic surfactants include quaternized hydrolysates of silk, wheat, and keratin protein, and the use of mixtures of the aforementioned catinic surfactants is within the scope of cleansing compositions.

[0061] When used, cationic surfactants constitute 1.0% by weight or less of the cleansing composition. If present, cationic surfactants typically constitute 0.01 to 0.7% by weight, more typically 0.1 to 0.5% by weight of the cleansing composition, encompassing the entire range included therein.

[0062] Particularly preferred surfactants for use in this cleansing composition include cocamidopropyl hydroxysultaine, cocamidosulfosuccinate, sodium lauroyl isethionate, or combinations thereof, with the most preferred surfactant being sodium lauroyl isethionate or a combination thereof.

[0063] Particularly preferred auxiliary surfactants for use in the cleansing composition of the present invention include cocamidopropyl betaine, sodium methyl cocoyl taurate, sodium cocoyl glycinate, sodium cocoyl glutamate, methyl ester sulfonate, fatty acid ester sulfonate, or combinations thereof.

[0064] The cleansing composition further contains 5% to 9% by weight of water, for example, 5% or more by weight of water and 9% or less by weight of water. For example, the cleansing composition contains 6% to 8% by weight of water.

[0065] The cleansing composition also contains 50% to 60% by weight of a fatty acid and soap mixture. The fatty acid to soap ratio can be 2.3:1 to 1.8:1. The large amount of fatty acid and soap mixture present allows for a significant reduction in the amount of surfactant compared to other formulations, without sacrificing comfort (hedonics) to obtain skin benefits.

[0066] The fatty acid can be selected from lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, lanolic acid, isostearic acid, arachidonic acid, hydroxystearic acid, or a combination thereof, preferably the fatty acid is selected from stearic acid, palmitic acid, or a combination thereof.

[0067] The term "soap" is used herein in its general sense, namely, a salt of an aliphatic alkane- or alkene monocarboxylic acid having preferably 6 to 22 carbon atoms, preferably 8 to 18 carbon atoms.

[0068] Typical soap salts are alkali metal or alkanolammonium salts of such fatty acids, but other metal salts, such as magnesium salts, can also be used. Sodium, potassium, magnesium, mono-, di-, and tri-ethanolammonium salts of such acids are found in soaps that are preferable for use herein.

[0069] Soap can be a neutralized fatty acid. The neutralized fatty acid can be selected from lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, lanolic acid, isostearic acid, arachidonic acid, hydroxystearic acid, or a combination thereof, preferably the fatty acid is stearic acid, palmitic acid, or one of them.

[0070] The soap may contain a mixture of lauric acid and an acid selected from myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, lanolic acid, isostearic acid, arachidonic acid, hydroxystearic acid, or a combination thereof. When lauric acid is used, it may be present in an amount of 80% by weight in the fatty acid and soap mixture; for example, lauric acid may be present in an amount of 85% by weight in the fatty acid and soap mixture. Lauric acid is generally rich in C12 and includes coconut oil and / or palm kernel oil.

[0071] The cleansing composition may further contain, but is not limited to, a variety of additives including colorants, emollients, anti-dandruff agents, skin texturers, silicone oils, cationic polymers, or combinations thereof. Each of these substances may be present in an amount of about 0.03 to about 5% by weight of the total weight of the liquid and composition, for example, 0.03 to 5% by weight, preferably 0.1 to 3% by weight, encompassing all ranges within that range. For example, a colorant may be present in an amount of 5 ppm to 15 ppm, for example, about 15 ppm.

[0072] Any further optional ingredients that may be present in the personal cleansing formulation in question include, for example, fragrances; chelating and sealing agents, such as tetrasodium ethylenediaminetetraacetate (EDTA), ethane hydroxyl diphosphonate (EHDP), and etidronic acid, i.e., 1-hydroxyethylidene diphosphonic acid (HEDP); colorants; opacifiers and pearlizers, such as zinc stearate, magnesium stearate, magnesium stearate, TiO2, ethylene glycol monostearate (EGMS), ethylene glycol distearate (EGDS), or Lytron 621 (styrene / acrylate copolymer); pH adjusters; antioxidants, such as butylated hydroxytoluene (BHT); stabilizers; foam enhancers, such as coconut acyl mono- or di-ethanolamide; ionized salts, such as sodium chloride and sodium sulfate, as well as other ingredients conventionally used in bar soap formulations. The total amount of such additional optional ingredients is typically 0 to 10% by weight, more specifically 0.1 to 5% by weight, based on the total weight of the personal cleansing formulation.

[0073] The composition typically contains one or more skin-beneficial additives. The term "skin-beneficial additive" is defined as a substance that softens the skin (stratum corneum) or improves the elasticity, appearance, and youthfulness of the skin (stratum corneum) by increasing its water content, adding or replacing lipids and other skin nutrients, or both, and further keeping the skin soft by delaying the decrease in its water content. Suitable skin-beneficial additives include, for example, emollients containing hydrophobic emollients, hydrophilic emollients, or blends thereof.

[0074] Useful skin-beneficial additives include the following: (a) Silicone oils and their modifications, e.g., linear and cyclic polydimethylsiloxanes; amino, alkyl, alkylaryl, and aryl silicone oils; (b) Natural oils and fats, e.g., jojoba oil, soybean oil, sunflower oil, rice bran oil, avocado oil, almond oil, olive oil, sesame oil, peach kernel oil, castor oil, coconut oil, and mink oil; cocoa butter; beef tallow and lard; hydrogenated oils obtained by hydrogenating the above oils; and synthetic mono, di, and triglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride; (c) Waxes such as jakarnauba, spermachete, beeswax, lanolin, and their derivatives; (d) Hydrophobic and hydrophilic plant extracts; (e) Hydrocarbons such as liquid paraffin, petrolatum, microcrystalline wax, ceresin, squalene, pristane, and mineral oil; (f) (g) Higher fatty acids such as uric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, lanolic acid, isostearic acid, arachidonic acid, and polyunsaturated fatty acids (PUFAs); (h) Higher alcohols, such as lauryl, cetyl, stearyl, oleyl, behenyl, cholesterol, and 2-hexydecanol alcohol; (h) Esters such as cetyl octanoate, myristyl lactate, cetyl lactate, isopropyl myristate, myristyl myristate, myristyl palmitate, isopropyl palmitate, isopropyl adipate, butyl stearate, decyl oleate, cholesterol isostearate, glycerol monostearate, glycerol monolaurate, glycerol distearate, glycerol tristearate, alkyl lactate, alkyl citrate, and alkyl tartrate;(i) Essential oils and their extracts, such as mint, jasmine, camphor, cypress (white cedar), bitter orange peel, lilac, turpentine (oil), cinnamon, bergamot, Satsuma mandarin, calamus, pine, lavender, bay (oil), clove, cypress, eucalyptus, lemon, starflower, thyme, peppermint, rose, sage, sesame, ginger, basil, juniper (oil), lemongrass, rosemary, rosewood, avocado, grape, grapeseed, myrrh, cucumber, watercress, calendula (oil), elderflower, geranium, linden blossom (oil), amaranth, seaweed, silver (j) Oils of ginseng, carrots, guarana, tea tree, jojoba, comfrey, oatmeal, cocoa, neroli, vanilla, green tea, pennyroyal, aloe vera, menthol, cineole, eugenol, citral, citronella, borneol, linalool, geraniol, evening primrose, camphor, thymol, spiranthol, penene, limonene and terpenoid oils; (j) Polyhydric alcohols, e.g., glycerin, sorbitol, propylene glycol, etc.; and polyols such as polyethylene glycol, e.g., Polyox (k) Lipids such as WSR-205 PEG 14M, Polyox WSR-N-60K PEG 45M, or Polyox WSR-N-750, and PEG 7M; (l) Vitamins, minerals, and skin nutrients, such as vitamins A, E, and K; vitamin alkyl esters, including vitamin C alkyl ester; magnesium, calcium, copper, zinc, and other metallic components; (m) Sunscreens such as octyl methoxycinnamate (Parsol MCX) and butyl methoxybenzoylmethane (Parsol 1789); (n) Phospholipids;and (o) anti-aging compounds such as α-hydroxy acids and β-hydroxy acids. Skin-beneficial additives generally account for up to 30% by weight of the liquid soap formulation, with levels of 0 to 25% by weight, more specifically 0 to 20% by weight, being typical levels used in many formulations of skin-beneficial additives commonly known as "emollients." Preferred skin-beneficial additives include fatty acids, hydrocarbons, polyhydric alcohols, polyols and mixtures thereof, and as emollients, at least one C; 12 From C 18 Examples include fatty acids, petrolatum, glycerin, sorbitol and / or propylene glycol, which are particularly relevant in one or more embodiments.

[0075] Bars can be manufactured by heating a mixer to approximately 80°C to 90°C, for example, adding fatty acids, then adding caustic substances to create precursors, followed by the addition of surfactants and other bar materials. The mixture is dried to the desired moisture content and then cooled. The cooled material is then extruded into billets (rod-shaped objects) and pressed into bars.

[0076] A method for producing a cleansing bar may include heating the cleansing composition disclosed herein to a temperature sufficient to provide a molten composition, then cooling the molten composition to form flakes and / or chips, refining the flakes and / or chips to form a billet, and punching and / or cutting the billet to form a cleansing bar. The temperature at which the cleansing composition is heated is at least 100°C, for example 100°C to 120°C, for example 105°C to 120°C.

[0077] Another method for preparing a cleansing composition may include heating the cleansing composition disclosed herein to a temperature sufficient to provide a molten composition, pouring the molten composition into a mold, cooling the molten composition until a cleansing bar is formed, and removing the cleansing bar from the mold. The temperature at which the cleansing composition is heated is at least 100°C, for example, 100°C to 120°C, or for example, 105°C to 120°C. [Examples]

[0078] The following examples are merely illustrative of the cleansing compositions disclosed herein and are not intended to limit the scope of this specification.

[0079] A batch process was used to prepare formulations based on individual syndets. The basic procedure involved heating the fatty acid above its melting point, partially neutralizing it as needed (optionally, pre-forming the soap at this stage), adding the required main and auxiliary surfactants along with small amounts of optional components, heating until homogeneous, drying to the desired moisture content, and then crystallizing to room temperature for further processing.

[0080] Subsequent processing includes steps to form the base material into a usable shape for evaluation purposes. It is considered important that these formulations meet specific criteria for extrusion. In particular, the hardness of the material must be suitable for compression into billets and selective punching into bars. Hardness can be defined using a TA.XT Plus texture analyzer, one of the texture analyzers. In the formulation examples presented herein, TAXT data is empirically correlated with suitability for processing by extrusion. Five measurements were taken per sample and averaged. The measurement method requires a 30° cone with a penetration program test speed of 1.00 mm / sec over a distance of 10.00 mm, using a trigger force of 0.0050 kg. The material temperature was also recorded. A generally accepted range is that the material can be processed if the TAXT reading is between 1000 and 4000.

[0081] A unique characteristic of this formulation space is its phase behavior. At the mixing temperature (defined as when all materials are in a molten state), the formulation can exist as either a viscous dough or a thin, easily pourable liquid. This phase behavior is advantageous as it allows for manufacturing flexibility. Doughs at high temperatures (i.e., above 100°C) can be cooled by conventional methods (e.g., peeling on cooling rolls, belt peeling, milling). Liquids at high temperatures (i.e., above 100°C) also have the conventional cooling possibilities described above, but can be further processed by melt casting procedures in which the molten material is poured into a mold and cooled.

[0082] For any ratio of components in the cleansing compositions disclosed herein, the phase chemistry during mixing is determined by the amount of water in the formulation. For a given formulation, a fluid dough always has a higher water content than its corresponding fluid; that is, for a given formulation, a phase transition based on water content can be identified. Conventional syndet manufacturing requires sufficient moisture during mixing to homogenize the batch. Typically, the batch is started with a higher-than-necessary water content initially, and drying is required to achieve the target water content. It is during this part of the process that it is determined whether the formulation remains as a dough or is sufficiently dried to a phase transition where a thin fluid is obtained. While each of these phase transitions is specific to a particular composition, for all compositions, there exists a phase transition point below which the formulation becomes liquid, and above which the formulation becomes a dough. Any composition to be cooled to flake and extruded must satisfy the requirements for extrusion (as described above).

[0083] Table 1 shows different ratios of materials and their respective intrinsic water content, which can be defined as phase transition points. Each formulation uses a "target" water content of 7.5% as the placeholder in the composition, but the actual water content of the batch determines the phase chemistry. All amounts are measured in weight percent.

[0084] [Table 1]

[0085] The selection of the formula space for this formulation is defined by the following parameters:

[0086] Examples 1 and 8

[0087] A typical formulation system is defined in Example 1. Free fatty acids contributed the highest portion of the composition, but the material still exhibited sufficient hardness to be processable by extrusion. The fatty acid-to-soap ratio was 1.9. The procedure for preparing this formulation was as follows: Stearic acid was heated to about 100°C, above its melting point, at which point the stearic acid was partially neutralized with a sodium hydroxide solution to obtain sodium stearate. When the mixture was homogeneous, 90 / 10 soap was added and mixed at 100°C to obtain a homogeneous solution. Sodium lauroyl isethionate (containing residual stearic acid and lauric acid) was then added and mixed above 100°C to obtain a fluid composition. Next, cocamidopropyl betaine was added and the mixture was heated above 100°C to remove excess water. The batch was complete when the target water content was achieved, and the batch was then cooled and processed by one of the methods described herein. All subsequent examples were prepared in the manner described, using appropriate substitutions as in those examples.

[0088] Example 1

[0089] [Table 2]

[0090] TAXT: 2447, temperature 35.4℃

[0091] In Example 1, the soap component consisted of sodium stearate produced in situ by partially neutralizing stearic acid, and a pre-made soap base (soap noodles). The soap component did not need to be a combination of sodium stearate and soap base (soap noodles) as shown in Example 8; the entire soap consisted of sodium stearate.

[0092] Example 8

[0093] [Table 3]

[0094] TAXT: 1651; 32.2℃

[0095] In Example 1, cocamidopropyl betaine was used as the auxiliary surfactant, but the method is not limited to this auxiliary surfactant.

[0096] Examples 2 to 7

[0097] The following examples demonstrate how various auxiliary surfactants with very different chemical properties do not affect the processing of formulations. Combinations of auxiliary surfactants can also be used. Demonstrations using various surfactant / auxiliary surfactant combinations can adjust foam differences such as milkiness, creaminess, and small or large bubbles without significantly affecting the acceptable foam volume. Such attributes are generally appreciated by those skilled in the art in comparison to typical syndet anchors such as DOVE®.

[0098] Example 2

[0099] [Table 4]

[0100] Example 3

[0101] [Table 5]

[0102] TAXT: 2375; 39.5℃

[0103] Example 4

[0104] [Table 6]

[0105] TAXT: 1208, 33.8℃

[0106] Example 5

[0107] [Table 7]

[0108] TAXT: 1739; 34.4℃

[0109] Example 6

[0110] [Table 8]

[0111] TAXT:2179;35.2℃

[0112] Example 7

[0113] [Table 9]

[0114] TAXT:2996;40.6℃

[0115] Examples 9 to 12

[0116] The following examples demonstrate the potential for varying the level of the main active ingredient, sodium lauroyl isethionate. In these systems, the amounts and ratios of total surfactant, auxiliary surfactant, and acid:soap affect the phase transition based on water content.

[0117] Example 9

[0118] [Table 10]

[0119] Example 10

[0120] [Table 11]

[0121] Example 11

[0122] [Table 12]

[0123] TAXT:2499;38.2℃

[0124] Example 12

[0125] [Table 13]

[0126] TAXT: 3610; 41.7℃

[0127] Examples 13 to 21

[0128] The remaining compositions further demonstrate that the levels of fatty acids, sodium lauroyl isethionate, soap, and auxiliary surfactants can be modified. It should be noted that the compositions of these examples are all processable formulations with respect to their TAXT values, which means that these compositions can be made into bars.

[0129] Example 13

[0130] [Table 14]

[0131] TAXT:2246;36.0℃

[0132] Example 14

[0133] [Table 15]

[0134] TAXT:2452;35.2℃

[0135] Example 15

[0136] [Table 16]

[0137] TAXT:2065;33.4℃

[0138] Example 16

[0139] [Table 17]

[0140] Example 17

[0141] [Table 18]

[0142] TAXT:2731;35.2℃

[0143] Example 18

[0144] [Table 19]

[0145] TAXT: 2867; 38.4℃

[0146] Example 19

[0147] [Table 20]

[0148] TAXT:3064;39.3℃

[0149] Example 20

[0150] [Table 21]

[0151] TAXT:2652;37.0℃

[0152] Example 21

[0153] [Table 22]

[0154] TAXT: 1831; 33.1℃

[0155] Examples 22 to 25

[0156] In these examples, the active ingredients were varied, as was the fatty acid:soap ratio. Example 23 had a fatty acid-to-soap ratio of 1:1, while Examples 22, 24, and 25 had a fatty acid-to-soap ratio of 1.8:1. The amount of the active ingredient was varied between sodium lauroyl isethionate, stearic acid, and a combination of soap base (soap noodles) and sodium stearate. All ingredient amounts are listed as weight percentages.

[0157] Data were collected during a 7-day Forearm Control Applied Test (FCAT). All measurements were taken on the afternoon of day 7. SKICON was measured as the area under the curve. TEWL was measured as the change from baseline. The index was measured as SKICON / TEWL. Higher SKICON values ​​are desirable, lower TEWL values ​​are desirable, and higher values ​​are preferable to lower values ​​for these indices.

[0158] Examples 22 to 25

[0159] [Table 23] * SLI = Sodium Lauroyl Isethionate

[0160] A typical response to improve overall performance would be to reduce the amount of active ingredients (i.e., reduce the level of synthetic detergents). Lowering the activity level can help create a milder formulation that is less damaging to the consumer's skin. This is shown in Examples 22 and 23, where the amount of SLI was reduced from 54% to 38%, while the fatty acid-to-soap ratio was changed from 1.8:1 to 1:1. As seen in these results, the fatty acid-to-soap ratio plays a role in achieving the desired results. SKICON, TEWL, and index values ​​were all impaired when the amount of active ingredients was reduced and the fatty acid-to-soap ratio was not considered. More simply, simply reducing the amount of active ingredients will not result in a clinically improved bar formulation unless an effective fatty acid-to-soap ratio is maintained. Unexpectedly, it was found that reducing the amount of active ingredients in the composition and balancing the constructed system (i.e., the fatty acid-to-soap ratio) resulted in improved performance as a formulation that was mild, foamed well, and was more acceptable to consumers.

[0161] With regard to the cleansing compositions and methods of preparation disclosed herein, it should be understood that, unless otherwise expressly indicated, all numbers in this specification indicating the amount or reaction conditions of materials, the physical properties of materials and / or use are modified by the word "about." All amounts are by weight of the final composition unless otherwise specified.

[0162] When specifying any range of concentration or quantity, note that any particular upper concentration may be associated with any particular lower concentration or quantity, and any sub-range consumed within that range. In this regard, note that all ranges disclosed herein include endpoints, and endpoints are independently combinable (e.g., the range "up to 25 wt%, or more specifically 5 wt% to 20 wt%, including the endpoint," and all intermediate values ​​within the range of 5 wt% to 25 wt%). "Combination" includes blends, mixtures, alloys, reaction products, etc. Furthermore, terms such as "first," "second," etc., as used herein do not indicate any order, quantity, or importance. The terms "a," "an," and "the" as used herein do not indicate a limit on quantity and should be interpreted as including both singular and plural unless otherwise indicated herein or unless the context clearly contradicts this. The suffix "s" as used herein is intended to include both singular and plural of the term it modifies, thereby including one or more terms (e.g., film). Throughout this specification, references to “one embodiment,” “one aspect,” “another embodiment,” “another aspect,” “one embodiment,” and “aspect” mean that a particular element (e.g., features, structures, and / or characteristics described in relation to an embodiment or aspect) is included in at least one embodiment or aspect described herein, and may or may not be present in other embodiments or aspects. Furthermore, it should be understood that the elements described may be combined in any suitable way in various embodiments or aspects.

[0163] All cited patents, patent applications, and other references are incorporated herein by reference in their entirety. However, where any terminology in this application conflicts with or conflicts with any terminology in any incorporated reference, the terminology from this application shall prevail over any conflicting terminology from any incorporated reference. While certain embodiments have been described, alternatives, modifications, variations, improvements, and substantial equivalents may arise that are not currently anticipated or may not be anticipated. Therefore, the claims at the time of filing and any amended appendices are intended to encompass all such alternatives, modifications, variations, improvements, and substantial equivalents.

[0164] To avoid ambiguity, the term "comprising" is intended to mean "including," but not necessarily "consisting" or "composed of." In other words, the listed steps, options, or choices do not need to be exhaustive.

[0165] Notwithstanding the fact that the claims may be found without multiple dependencies or redundancies, all aspects of the disclosure of the present invention found herein should be considered to be multiplely dependent on one another. Unless otherwise specified, numerical ranges expressed in the form "x to y" are understood to include x and y. When specifying values ​​or quantities in any range, any particular upper limit or quantity may be associated with any particular lower limit or quantity. All percentages and ratios contained herein are calculated in weight unless otherwise specified. Various features of the present invention mentioned in the individual sections above may be applied to other sections as needed, with the necessary modifications. Thus, features specified in one section may be combined with features specified in other sections as needed. Any section headings are added for convenience only and are not intended to limit the disclosure in any way.

Claims

1. 25% to 35% by weight of surfactant; 1.5% to 5% by weight of auxiliary surfactants; 5% to 9% by weight of water; and A mixture of fatty acids and soap comprising 50% to 60% by weight of fatty acids and soap, wherein the fatty acid-to-soap ratio is 2.3:1 to 1.8:1, and the fatty acids are selected from lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, lanolic acid, isostearic acid, arachidonic acid, hydroxystearic acid, or a combination thereof, wherein The surfactant is cocamidopropyl hydroxysultaine, cocamidosulfosuccinate, sodium lauroyl isethionate, or a combination thereof. Cleansing composition.

2. The cleansing composition according to claim 1, wherein the surfactant is present in an amount of 25% to 32% by weight.

3. The cleansing composition according to claim 1 or 2, wherein the auxiliary surfactant comprises cocamidopropyl betaine, sodium methyl cocoyl taurate, sodium cocoyl glycinate, methyl ester sulfonate, fatty acid ester sulfonate, or a combination thereof.

4. A cleansing composition according to any one of claims 1 to 3, wherein the soap is a neutralized fatty acid.

5. The cleansing composition according to claim 4, wherein the neutralizing fatty acid is selected from lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, lanolic acid, isostearic acid, arachidonic acid, hydroxystearic acid, or a combination thereof.

6. The cleansing composition according to any one of claims 1 to 5, wherein the soap comprises a mixture of lauric acid and an acid selected from myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, lanolic acid, isostearic acid, arachidonic acid, hydroxystearic acid, or a combination thereof.

7. The cleansing composition according to claim 6, wherein lauric acid is present in the fatty acid and soap mixture in an amount of 80% by weight.

8. The cleansing composition according to any one of claims 1 to 7 is heated to a temperature sufficient to provide a molten composition; The molten composition is cooled to form flakes and / or chips; The flakes and / or chips are kneaded together to form a billet; The billet is punched and / or cut to form a cleansing bar. A method for manufacturing a cleansing bar.

9. The method according to claim 8, wherein the cleansing composition is heated to a temperature of at least 100°C.

10. The method according to claim 8, wherein the billet has a TAXT reading of 1000 to 4000.

11. The cleansing composition according to any one of claims 1 to 7 is heated to a temperature sufficient to provide a molten composition; The molten composition is poured into the mold; Cool the molten composition until a cleansing bar is formed; Remove the cleansing bar from the mold. A method for manufacturing a cleansing bar.

12. The method according to claim 11, wherein the cleansing composition is heated to a temperature of at least 100°C.

Images