Colored soap bar composition comprising starch

Abstract

The invention relates to a soap composition. The present invention more particularly relates to a coloured soap composition comprising starch for increased transparency.

Description

Technical Field

[0001] This invention relates to a soap bar composition. More particularly, this invention relates to an extruded coloring soap composition comprising starch. Background Technology

[0002] Colored soap bars have been known for a long time, and there has always been a desire to make their appearance more attractive to consumers. One way to do this is by adding coloring agents. However, simply adding coloring agents may not be enough, so pearlescent agents have also been explored. It can also be observed that soap bars may lose their shine and color during use.

[0003] Therefore, a colored soap bar with enhanced color and transparency is needed. Summary of the Invention

[0004] A first aspect of the present invention provides a soap bar composition comprising 10-80% by weight of total fatty substances; 0.1-5% by weight of electrolytes; 10-45% by weight of water; 5.5-45% by weight of starch; and 0.01-2% by weight of a colorant comprising an oil-dispersed pigment; wherein the transparency of the soap bar is improved compared to an equivalent bar without starch.

[0005] A second aspect of the present invention provides a method for enhancing the transparency of a soap bar composition, the method comprising the following steps: a. Saponifying fatty substances with alkali to produce saponified material, wherein 0.1-5% by weight of electrolyte is added during the saponification process; b. Add 5.5-45% by weight of starch or modified starch and water to obtain the saponified material; and c. Extruding the saponified material obtained in step (b) to obtain soap bars according to the first aspect. The colorant is added at 0.01-2% by weight of the soap bar composition before or after the addition of starch.

[0006] A third aspect of the invention provides the use of starch in soap bar compositions according to the first aspect, which includes a colorant to enhance the color of the soap bar composition compared to an equivalent soap bar composition without starch. Detailed Implementation

[0007] These and other aspects, features, and advantages will become apparent to those skilled in the art upon reading the following detailed description and appended claims. For the avoidance of doubt, any feature of one aspect of the invention may be used in any other aspect of the invention. The word “comprising” is intended to mean “including” but not necessarily “consisting of” or “made of”. In other words, the listed steps or options need not be exhaustive. It should be noted that the examples given in the following description are intended to illustrate the invention and not to limit the invention to these examples alone. Similarly, unless otherwise stated, all percentages are weight percentages. Except in the operational and comparative examples, or where expressly stated otherwise, all figures indicating the amount of material or reaction conditions, physical properties of the material, and / or uses in this specification and claims should be understood to be modified by the word “about”. Numerical ranges expressed in the format “from x to y” should be understood to include both x and y. When multiple preferred ranges are described in the format “from x to y” for a particular feature, it should be understood that all ranges combining different endpoints are also considered.

[0008] Unless otherwise stated, throughout this specification, wt% refers to the total weight of the soap composition of the present invention.

[0009] The various components of the composition are described in more detail below.

[0010] soap composition This invention relates to a soap composition. The soap composition should be understood as a composition that can be used as soap or a composition for preparing soap. More preferably, the invention provides a soap composition for preparing soap bars, more preferably extruded soap bars, and even more preferably soap bars prepared by a plow-type shear mixer. The soap composition of the present invention is particularly suitable for personal hygiene.

[0011] The soap composition of the present invention provides a soap bar composition comprising 10-80% by weight of total fatty substances; 0.1-5% by weight of electrolytes; 10-45% by weight of water; 5.5-45% by weight of starch; and 0.01-2% by weight of a colorant comprising an oil-dispersed pigment; wherein the transparency of the soap bar is improved compared with an equivalent bar without starch.

[0012] The compositions of the present invention are preferably used or used to prepare molded solids, such as bars. The cleaning soap compositions are preferably used or used to prepare wash-off products that generally contain a sufficient amount of surfactant, for cleaning desired localized surfaces, such as the whole body, hair, scalp, or face. They are applied to the localized surface and remain there for only a few seconds or minutes before being rinsed off with plenty of water.

[0013] The soap composition may additionally contain one or more synthetic surfactants selected from anionic, nonionic, cationic, or amphoteric surfactants, preferably anionic surfactants. According to the invention, these synthetic surfactants are contained in amounts of less than 8%, preferably less than 4%, more preferably less than 1%, and sometimes are not present in the composition. "Not present" means that no intentionally added synthetic surfactants are present in the soap composition of the invention.

[0014] The inventors prepared an extruded colored soap bar composition containing organic fillers such as starch, and surprisingly found that the soap bars had richer and brighter colors compared to equivalent soap bar compositions without starch.

[0015] Preferably, in the soap bar composition of the present invention, starch or its derivatives are contained in 5.5-45% by weight, more preferably 8-40% by weight, and most preferably 10-35% by weight of the soap bar composition.

[0016] Preferably, in the soap bar composition of the present invention, the starch is natural starch, pregelatinized starch, invert starch, or a mixture thereof.

[0017] soap When the total fatty acid (TFM) in the soap composition of the present invention is used for personal washing applications, it comprises 10-80% by weight, preferably 15-75% by weight, more preferably 20-75% by weight, and most preferably 25-70% by weight of the total amount of soap in the soap composition. When the soap composition of the present invention is used for washing fabrics, it comprises 15% to 60% by weight of fatty acid soap. A preferred aspect of such a soap composition comprises at least 20% by weight, preferably at least 25% by weight, more preferably at least 30% by weight, and most preferably at least 35% by weight, but generally not exceeding 58% by weight, more preferably not exceeding 55% by weight, further preferably not exceeding 53% by weight, more preferably not exceeding 50% by weight, and most preferably not exceeding 45% by weight of TFM.

[0018] The term "total fatty substances" is widely and commonly used in the soap and detergent industry. The term "total fatty substances," abbreviated as "TFM," is used to express the weight percentage of fatty acids and triglyceride residues present in a personal care composition, without regard to accompanying cations. For soaps with 18 carbon atoms, the accompanying sodium cation typically accounts for about 8% by weight. Other cations, such as zinc, potassium, magnesium, alkylammonium, and aluminum, may be used as needed.

[0019] The term "soap" refers to a salt of fatty acids. Preferably, the soap is C8 to C96. 24 Soaps made from fatty acids.

[0020] The cation can be an alkali metal, alkaline earth metal, or ammonium ion, preferably an alkali metal. Preferably, the cation is selected from sodium or potassium, more preferably sodium. The soap can be saturated or unsaturated. Saturated soaps are superior to unsaturated soaps in terms of stability. The oil or fatty acid can be of plant or animal origin.

[0021] Soap can be obtained through the saponification of oils, fats, or fatty acids. Commonly used fats or oils in soap compositions can be selected from tallow, tallow stearin, palm oil, palm stearin, soybean oil, fish oil, castor oil, rice bran oil, sunflower oil, coconut oil, babassu oil, and palm kernel oil. Fatty acids can be derived from coconut, rice bran, peanut, tallow, palm, palm kernel, cottonseed, or soybean.

[0022] Fatty acid soaps can also be prepared synthetically (e.g., by oxidation of petroleum or by hydrogenation of carbon monoxide via the Fischer-Tropsch process). Resin acids, such as those present in tall oil, can also be used. Naphthenic acids can also be used.

[0023] The soap compositions of the present invention preferably comprise low molecular weight soaps (C8-C4) that are generally water-soluble. 14 The soap composition comprises 2-20% by weight of C16 to C24 fatty acids. Preferably, the soap composition contains 15-55% by weight of C16 to C24 fatty acids, typically water-insoluble. Preferably, 15-42% unsaturated fatty acid soap may also be included in the total soap content of the composition. Oleic acid soap is preferred among the unsaturated soaps.

[0024] water The soap composition of the present invention can maintain a high moisture content. The soap composition of the present invention contains 10-45% by weight of the soap composition, preferably 15-45% by weight, more preferably 15-40% by weight, and most preferably 18-38% by weight of water.

[0025] electrolytes The presence of small amounts of electrolytes (other than soap) can affect the liquid-to-solid ratio. Increasing the electrolyte content reduces the solubility of soap, thereby increasing the amount of solid phase; on the other hand, decreasing the electrolyte level makes the strips softer.

[0026] Soap compositions typically contain an electrolyte and water. The electrolyte according to the invention comprises a compound that substantially dissociates into ions in water. The electrolyte according to the invention is not an ionic surfactant. Suitable electrolytes for inclusion in soap-making processes are alkali metal salts. Preferred electrolytes include mono, di, or trisalts of sodium sulfate, sodium chloride, sodium citrate, potassium chloride, potassium sulfate, sodium carbonate, and other alkaline earth metals; more preferred electrolytes are sodium chloride, sodium sulfate, and potassium chloride; and particularly preferred electrolytes are sodium chloride and sodium sulfate, and combinations thereof. For the avoidance of doubt, it should be clarified that the electrolyte is a non-soap material.

[0027] The present invention contains an electrolyte in the range of 0.1-5% by weight of the extruded soap bar composition, more preferably 1-4% by weight of the soap bar composition, and most preferably 1.5-3.5% by weight.

[0028] Electrolytes may include sodium chloride, sodium sulfate, sodium citrate, sodium carbonate, or the corresponding potassium salts.

[0029] Sodium sulfate and sodium chloride are most preferably used as electrolytes in the compositions of the present invention.

[0030] Preferably, sodium sulfate is present in the range of 0.1-6% by weight of the composition, more preferably 0.5-5% by weight, and most preferably 0.7-4% by weight. Preferably, sodium sulfate is present in the range of at least 0.1% by weight of the total weight of the composition of the present invention, more preferably at least 0.5% by weight, most preferably at least 0.7% by weight, and preferably not more than 6% by weight, more preferably not more than 5% by weight, further preferably not more than 4% by weight, and most preferably not more than 3.5% by weight.

[0031] Preferably, sodium chloride is present in the range of 0.1-6% by weight of the composition, more preferably 0.5-5% by weight, and most preferably 0.7-4% by weight. Preferably, sodium chloride is at least 0.1% by weight of the total weight of the composition of the present invention, more preferably at least 0.5% by weight, most preferably at least 0.7% by weight, and preferably not more than 6% by weight, more preferably not more than 5% by weight, further preferably not more than 4% by weight, and most preferably not more than 3.5% by weight.

[0032] Organic fillers Preferably, the organic filler is starch, and more preferably, the starch is natural starch, pregelatinized starch, inverted starch, or a mixture thereof.

[0033] Preferably, the organic filler in the soap composition is in the range of 5-45% by weight of the soap bar composition, preferably 5.5-40% by weight, more preferably 6-38% by weight, more preferably 6.5-35% by weight, even more preferably 7-34% by weight, even more preferably 7.5-33% by weight, even more preferably 8-32% by weight, even more preferably 10-30% by weight, and most preferably 10.5-30% by weight.

[0034] Preferably, when the organic filler is starch, the starch content in the soap composition ranges from 5.5 to 45% by weight of the soap bar composition, preferably 5.5 to 40% by weight, more preferably 6 to 38% by weight, more preferably 6.5 to 35% by weight, even more preferably 7 to 34% by weight, even more preferably 7.5 to 33% by weight, even more preferably 8 to 32% by weight, even more preferably 10 to 30% by weight, and most preferably 10.5 to 30% by weight.

[0035] Suitable starch materials include natural starch (from corn, wheat, rice, potatoes, cassava, etc.), pregelatinized starch, various physically and chemically modified starches, and mixtures thereof. The term "natural starch" refers to starch that has not been chemically or physically modified, also known as raw starch or natural starch.

[0036] Preferred starches are native or natural starches derived from corn, cassava, wheat, potatoes, rice, and other natural starch sources. Raw starches with varying ratios of amylase and amylopectin include: for example, corn (25% amylase); waxy corn (0%); high-amylase corn (70%); potatoes (23%); rice (16%); sago (27%); cassava (18%); wheat (30%), and others. Raw starches can be used directly or modified during the preparation of the strip composition to make the starch gelatinized, partially or completely gelatinized.

[0037] Suitable starchy materials that can be used include natural starch (from corn, wheat, rice, potatoes, cassava, etc.), pregelatinized starch, various physically and chemically modified starches, and mixtures thereof. The term "natural starch" refers to starch that has not been chemically or physically modified, also known as raw starch or natural starch. Raw starch can be used directly or modified during the preparation of the strip composition to make the starch gelatinized, partially or completely gelatinized. Such starchy materials are commercially available, for example, FARMAL CS 3400 (corn starch) and FARMAL WS 4400 (corn starch; wax-unmodified).

[0038] Preferably, the organic filler is starch, and more preferably, the starch is natural starch, pregelatinized starch, inverted starch, or a mixture thereof.

[0039] Colorant The soap bar composition of the present invention contains 0.01-2% by weight, more preferably 0.08-2% by weight, and most preferably 0.1-1.8% by weight of a colorant.

[0040] Coloring agents are selected from dyes, pigments, and combinations thereof.

[0041] Preferably, the colorant should be at least 0.01% by weight of the soap bar composition, more preferably at least 0.02% by weight, even more preferably at least 0.05% by weight, and most preferably at least 0.08% by weight.

[0042] The colorant of the present invention comprises an oil-dispersed pigment. Preferably, the colorant comprises at least 50% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, more preferably 80% by weight, and most preferably at least 90% by weight of an oil-dispersed pigment. In another preferred aspect of the invention, the colorant consists of 100% by weight of an oil-dispersed pigment. The pigment is preferably pre-dispersed in oil and incorporated into the soap during the finishing process.

[0043] The colorant can be any color.

[0044] Non-soap surfactants In addition to soaps of fatty acids, preferred strips may contain non-soap surfactants, which are used as co-surfactants and are selected from anionic, nonionic, amphoteric, amphoteric and cationic surfactants.

[0045] Based on the weight of the soap bar composition, the composition of the present invention may optionally contain 0.1 to 20% by weight, more preferably 2 to 15% by weight, and most preferably 5 to 10% by weight of a non-soap surfactant.

[0046] Based on the weight of the composition, the preferred bar contains 0.0001-15% by weight of co-surfactant. More preferably, the bar contains 2-10% by weight of co-surfactant, and the most preferred composition contains 2.5-6% by weight of co-surfactant based on the weight of the soap bar composition.

[0047] Suitable anionic surfactants include water-soluble salts of organic sulfuric acid reaction products, whose molecular structures contain alkyl groups with 8-22 carbon atoms and groups selected from sulfonic acid or sulfate ester groups, and mixtures thereof.

[0048] Examples of suitable anionic surfactants are sodium and potassium salts of alkoxides, particularly those obtained by sulfation of higher alcohols produced by the reduction of glycerides from tallow or coconut oil; sodium and potassium alkylbenzene sulfonates, such as those in which the alkyl group contains 9-15 carbon atoms; sodium alkyl glycerol ether sulfates, particularly those ethers of higher alcohols derived from tallow and coconut oil; sodium coconut oil fatty acid monoglyceride sulfates; sodium and potassium salts of sulfates of the reaction product of 1 mole of higher fatty alcohol and 1-6 moles of ethylene oxide; sodium and potassium salts of alkylphenol ethylene oxide ether sulfates having 1-8 ethylene oxide molecules, wherein the alkyl group contains 4-14 carbon atoms; and reaction products of fatty acids esterified with ethanesulfonate and neutralized with sodium hydroxide, wherein, for example, the fatty acids are derived from coconut oil and mixtures thereof. Preferred water-soluble synthetic anionic surfactants are alkali metal (e.g., sodium and potassium) and alkaline earth metal (e.g., calcium and magnesium) salts of higher alkylbenzene sulfonates, as well as mixtures with olefin sulfonates and higher alkyl sulfates, and higher fatty acid monoglyceride sulfates.

[0049] Suitable nonionic surfactants can be broadly described as compounds formed by the condensation of hydrophilic epoxy alkyl groups with organic hydrophobic compounds that may be aliphatic or alkyl aromatic.

[0050] The length of the hydrophilic or polyoxyalkylene group condensed with any specific hydrophobic group can be readily adjusted to produce a water-soluble compound with the desired balance between hydrophilic and hydrophobic elements. Specific examples include condensation products of aliphatic alcohols with 8-22 carbon atoms in straight-chain or branched configurations with ethylene oxide, such as coconut oil ethylene oxide condensates containing 2-15 moles of ethylene oxide per mole of coconut alcohol; condensates of alkylphenols containing 6-12 carbon atoms with 5-25 moles of ethylene oxide per mole of alkylphenol; condensates of the reaction product of ethylenediamine and propylene oxide with ethylene oxide, the condensate containing 40-80% by weight of polyoxyethylene and having a molecular weight of 5,000-11,000; and tertiary amine oxides with the structure R3NO, where one of the R groups is 8. Alkyl groups of 10-18 carbon atoms, with the others being methyl, ethyl, or hydroxyethyl, such as dimethyldodecylamine; tertiary phosphine oxides of structure R3PO, wherein one group R is an alkyl group of 10-18 carbon atoms, and the others are alkyl or hydroxyalkyl groups of 1-3 carbon atoms, such as dimethyldodecylphosphine oxide; and dialkyl sulfoxides of structure R2SO, wherein the group R is an alkyl group of 10-18 carbon atoms, and the other is methyl or ethyl, such as methyltetradecyl sulfoxide; fatty acid alkylolamides; alkylene oxide condensates of fatty acid alkylolamides and alkyl thiols.

[0051] Suitable cationic surfactants that can be incorporated are alkyl-substituted quaternary ammonium halide salts, such as bis(hydrogenated tallow)dimethylammonium chloride, hexadecyltrimethylammonium bromide, benzalkonium chloride and dodecylmethylpolyoxyethylene ammonium chloride, as well as amine and imidazoline salts, such as primary, secondary and tertiary amine hydrochlorides and imidazoline hydrochlorides.

[0052] Suitable amphoteric surfactants are derivatives of aliphatic secondary and tertiary amines containing alkyl groups with 8-18 carbon atoms and aliphatic groups substituted with anionic water solubilizing groups, such as sodium 3-dodecaneaminopropionate, sodium 3-dodecaneaminopropanesulfonate, and sodium N-2-hydroxydodecyl-N-methyltaurate.

[0053] Suitable zwitterionic surfactants are derivatives of aliphatic quaternary ammonium, sulfonium, and phosphonium compounds, having an aliphatic group with 8-18 carbon atoms and an aliphatic group substituted with an anionic water solubilizing group, such as 3-(NN-dimethyl-N-hexadecylammonium)propane-1-sulfonate betaine, 3-(dodecylmethylsulfonium)propane-1-sulfonate betaine, and 3-(hexadecylmethylphosphonium)ethanesulfonate betaine.

[0054] Further examples of suitable detergent active compounds are compounds commonly used as surface-active agents, as given in the well-known textbooks Schwartz and Perry's "Surface Active Agents," Volume 1, and Schwartz, Perry, and Berch's "Surface Active Agents and Detergents," Volume 2.

[0055] Other preferred ingredients besides those mentioned above; preferred cleaning strips may include other ingredients.

[0056] The preferred strip may contain up to 30% by weight of beneficial agents. Preferred beneficial agents are moisturizers, emollients, sunscreens, and anti-aging compounds. During the preparation of the strip, the beneficial agents may be added at appropriate steps. Some beneficial agents may be introduced as macrodomains.

[0057] Examples of moisturizers and emollients include cetyl alcohol, CARBOPOL® 934, ethoxylated castor oil, paraffin oil, lanolin, and their derivatives. Siloxane compounds, such as siloxane surfactants like DC® 3225C (Dow Corning), and / or siloxane emollients, and silicone oils (DC-200®, from Dow Corning) may also be included. Sunscreens, such as 4-tert-butyl-4'-methoxydibenzoylmethane (available from Givaudan under the trade name PARSOL® 1789) or 2-ethylhexyl methoxycinnamate (available from Givaudan under the trade name PARSOL® MCX), or other UV-A and UV-B sunscreens may also be added. Lipids such as cholesterol, ceramides, and pseudoamides, as well as exfoliating particles such as polyethylene beads, walnut shells, almonds, petals, and seeds, may also be present. Structuring agents such as maltodextrin or starch may be used to construct the strips. Preferred ingredients may also include essential oils such as bergamot and citrus, or insoluble extracts of avocado, grape, grape seed, myrrh, cucumber, watercress, calendula, elderflower, geranium, linden blossom, amaranth, seaweed, ginkgo, ginseng, and other plant extracts. Further optional ingredients include chelating agents such as EDTA, preservatives (e.g., GLYDANT®), antioxidants, and natural and synthetic fragrances. Cationic polymers may be included as conditioning agents. These include polyquaternium®, MERQUAT® polymers, and JAGUAR® polymers. The composition may also optionally include other ingredients commonly used in soaps, such as foam enhancers, emollients such as glycerin, moisturizers, colorants, and sunscreens.

[0058] Other auxiliary materials may include bactericides and preservatives. These components are generally present in amounts less than 2% by weight, typically less than 0.5% by weight. In the method of the present invention, appropriate amounts of other optional components may be added, such as antioxidants, fragrances, polymers, chelating agents, colorants, deodorants, dyes, emollients, moisturizers, enzymes, foam enhancers, bactericides, antimicrobial agents, foaming agents, pearlescent agents, skin conditioning agents, stabilizers, fat enrichers, and sunscreens. Preferably, the components are added after the saponification step and before filtration. Sodium metabisulfite, ethylenediaminetetraacetic acid (EDTA), borax, and ethylenedihydroxybisphosphonic acid (EHDP) are preferably added to the formulation.

[0059] Preferably, the cleaning strip contains no or substantially no light-blocking agents. A light-blocking agent is a compound that limits the amount of light passing through a solid composition. When a light-blocking agent is present, the solid composition is typically opaque, i.e., "opacified." Examples of light-blocking agents include titanium dioxide, zinc oxide, etc.

[0060] Optional ingredients in soap composition The soap bar composition may optionally contain 0.1 to 15% by weight, preferably 0.2 to 12% by weight, of free fatty acids. Free fatty acids refer to carboxylic acids containing a hydrocarbon chain and a terminal carboxyl group bonded to H. Suitable fatty acids are C8 to C22 fatty acids. Preferred fatty acids are C12 to C18, preferably mainly saturated straight-chain fatty acids. However, some unsaturated fatty acids may also be used.

[0061] The composition preferably comprises a polyol (also known as a polyhydroxy alcohol) or a mixture of polyols. A polyol is the term used herein to name highly water-soluble compounds having a plurality of (at least two, preferably at least three) hydroxyl groups. A variety of types of polyols are available, including: relatively low molecular weight short-chain polyhydroxy compounds such as glycerol and propylene glycol; sugars such as sorbitol, mannitol, sucrose, and glucose; modified carbohydrates such as hydrolyzed starch, dextrin, and maltodextrin; and polymerized synthetic polyols such as polyethylene glycol (PEG) and polypropylene glycol (PPG). Particularly preferred polyols are glycerol, sorbitol, and mixtures thereof. The most preferred polyol is glycerol. In a preferred embodiment, the contents of the present invention comprise 0-8% by weight, preferably 1-7.5% by weight, of a polyol.

[0062] The various optional ingredients that make up the final soap composition are described below: The total content of auxiliary materials used in the soap composition is generally no more than 50% by weight of the soap composition, preferably 1-50% by weight, more preferably 3-45% by weight.

[0063] The additive system may optionally include insoluble particles comprising one or a combination of materials. Insoluble particles refer to materials present in solid particulate form and suitable for personal washing. Preferably, mineral (e.g., inorganic) or organic particles are present.

[0064] Insoluble particles should not be perceived as itchy or granular, therefore their particle size should be less than 300 micrometers, more preferably less than 100 micrometers, and most preferably less than 50 micrometers.

[0065] Preferred inorganic particulate materials can be inorganic fillers, including but not limited to talc, clay, and calcium carbonate. Talc is a magnesium silicate mineral material with a lamellar silicate structure and Mg3Si4(OH). 22 It is composed of substances that can be obtained through hydration. It has a plate-like morphology and is essentially oleophilic / hydrophobic, meaning it is wetted by oil rather than water.

[0066] Calcium carbonate, or chalk, exists in three crystalline forms: calcite, aragonite, and aragonite. Calcite is naturally rhombohedral or cubic, aragonite is needle-like or dendritic, and aragonite is spherical.

[0067] Other examples of optional insoluble inorganic particulate materials include aluminates, silicates, phosphates, insoluble sulfates, borates, and clays (e.g., kaolin, terracotta) and combinations thereof.

[0068] Organic particulate materials include: insoluble polysaccharides, such as highly cross-linked or insoluble starch (e.g., through reaction with hydrophobic substances such as octyl succinate) and cellulose; synthetic polymers, such as various polymer meshes and suspension polymers; insoluble soaps and mixtures thereof.

[0069] Preferably, the compositions of the present invention comprise a polymer. Acrylic polymers are particularly preferred. A preferred composition comprises 0.05 to 5% acrylate. A more preferred composition comprises 0.01 to 3% acrylate. Examples of acrylate polymers include polymers and copolymers of acrylic acid crosslinked with polyallyl sucrose as described in U.S. Patent 2,798,053, which is incorporated herein by reference. Other examples include polyacrylates, acrylate copolymers or alkali-swellable acrylic emulsion copolymers, hydrophobically modified alkali-swellable copolymers, and crosslinked homopolymers of acrylic acid. Examples of such commercially available polymers include ACULYN®, CARBOPOL®, and the CARBOPOL® Ultrez series.

[0070] The strip composition preferably contains 0.1-25% by weight, preferably 5-15% by weight, of these mineral or organic particles.

[0071] Optical opacifiers may optionally be present in the personal care composition. When an opacifier is present, the cleansing strip is typically opaque. Examples of opacifiers include titanium dioxide, zinc oxide, etc. Particularly preferred opacifiers that can be used when an opaque soap composition is required are glycol monostearate or distearate, for example, in the form of a 20% solution of sodium lauryl ether sulfate. Zinc stearate is an optional opacifier.

[0072] The product can be produced in a water-clear form, i.e., a transparent soap, in which case it does not contain any opacifiers.

[0073] In the soap composition of the present invention, when measured in a 4% distilled aqueous solution at 25°C, the pH value of the composition ranges from 9 to 13.

[0074] The preferred strip may additionally contain up to 30% by weight of beneficial agents. Preferred beneficial agents include moisturizers, emollients, sunscreens, and anti-aging compounds. These beneficial agents may be added at appropriate steps during the strip manufacturing process. Some beneficial agents may be introduced as macrodomains.

[0075] In the method of this invention, appropriate amounts of other optional ingredients may be added, such as antioxidants, fragrances, polymers, chelating agents, colorants, deodorants, dyes, enzymes, foam promoters, bactericides, antimicrobial agents, foaming agents, pearlescent agents, skin conditioning agents, stabilizers, or fat enriching agents. Preferably, the ingredients are added after the saponification step. Preferably, sodium metabisulfite, ethylenediaminetetraacetic acid (EDTA), borax, or ethylhexyl hydroxybisphosphonic acid (EHDP) are added to the formulation.

[0076] The compositions of the present invention can be used to provide antimicrobial benefits. Preferably, the antimicrobial agent included to provide this benefit comprises an oligokinetic metal or a compound thereof. Preferred metals are silver, copper, zinc, gold, or aluminum. Silver is particularly preferred. In ionic form, it can be present as a salt of any applicable oxidation state or as any compound. Preferred silver compounds are silver oxide, silver nitrate, silver acetate, silver sulfate, silver benzoate, silver salicylate, silver carbonate, silver citrate, or silver phosphate, wherein in one or more embodiments, silver oxide, silver sulfate, and silver citrate are of particular interest. In at least one preferred embodiment, the silver compound is silver oxide. The oligokinetic metal or a compound thereof is preferably included in the composition at 0.0001 to 2% by weight, preferably 0.001 to 1% by weight. Alternatively, essential oil antimicrobial active substances may be included in the compositions of the present invention. Preferred active essential oil substances that may be included are terpineol, thymol, carvacrol, (E)-2-(prop-1-enyl)phenol, 2-propylphenol, 4-pentylphenol, 4-sec-butylphenol, 2-benzylphenol, eugenol, or combinations thereof. Furthermore, preferred active essential oil substances are terpineol, thymol, carvacrol, or thymol, with terpineol or thymol being most preferred, and a combination of both being ideal. The active essential oil components are preferably included at 0.001-1% by weight, more preferably 0.01-0.5% by weight of the composition.

[0077] Soap compositions for washing fabrics may contain one or more of the aforementioned optional ingredients. However, antimicrobial agents are typically not added to laundry strips. Laundry strips usually contain chelating agents that are not generally included in soap compositions for personal hygiene. Chelating agents may be selected from, but are not limited to, ethylenediaminetetraacetic acid (EDTA), ethylenedihydroxybisphosphonic acid (EHDP), or mixtures thereof. Chelating agents are preferably present in an amount ranging from 0.01% by weight to 1% by weight. Non-phosphate chelating agents such as methylglycine diacetic acid and its salts are also preferred.

[0078] method In a second aspect, the present invention relates to a method for enhancing the transparency of a soap bar composition, the method comprising the following steps: a. Saponifying fatty substances with alkali to produce saponified material, wherein 0.1-5% by weight of electrolyte is added during the saponification process; b. Add 5.5-45% by weight of starch or modified starch and water to obtain the saponified material; and c. Extruding the saponified material obtained in step (b) to obtain soap bars according to the first aspect. The colorant is added at 0.01-2% by weight of the soap bar composition before or after the addition of starch.

[0079] Soap compositions can be prepared into strips using a press, which first involves saponifying the fatty raw material with alkali, and then extruding the mixture in a conventional strip press. The material from the strip can then be optionally cut to the desired size and stamped with the desired markings. A particularly important benefit of the invention is that, despite the high water content of the soap composition, compositions thus prepared by extrusion are found to be easily stamped with the desired markings. “Easy to extrude” means that the strip is stiff enough during extrusion that it leaves the extruder in a sufficiently robust form, thus qualifying as a rigid strip. The stiffness of the strip is preferably greater than 1.2 kg, more preferably in the range of 1.2 to 5.0 kg (at 40°C). The stiffness is preferably measured using a TA-XT Express device provided by Stable Micro Systems. Using this device, the hardness is measured with a 30° conical probe (part number P / 30c) to a penetration depth of 15 mm. If the soap material is too soft and passes through the extruder, it will not extrude from the extruder as a sufficiently cohesive material to be considered a strip. “Easy to stamp” means that the soap composition has such consistency and low viscosity that it does not stick to the die used to stamp any desired markings on the strip. Therefore, the soap composition prepared by the method of the present invention preferably contains a mark stamped thereon.

[0080] The specific methods that can be used in the general process for manufacturing soap compositions described above include one of the following methods.

[0081] Preferably, in the method of the present invention, the TFM of the soap composition is in the range of 10-80% by weight of the soap bar composition.

[0082] Preferably, in the method of the present invention, the soap composition contains 10-45% by weight of water based on the weight of the soap bar composition.

[0083] Preferably, in the method of the present invention, the soap composition contains 0.1 to 5% by weight of electrolyte based on the weight of the soap bar composition.

[0084] Preferably, in the method of the present invention, the colorant in the soap composition comprises an oil-dispersed pigment, and most preferably, the colorant is in the range of 0.01-2% by weight of the soap bar composition.

[0085] Preferably, the soap composition of the present invention is prepared in a plow-type shear mixer.

[0086] use The present invention provides the use of starch in soap bar compositions according to the first aspect, which includes a colorant to enhance the color of the soap bar composition compared to an equivalent soap bar composition without starch.

[0087] The present invention provides the use of starch in soap bar compositions according to the first aspect, wherein the starch or a derivative thereof is 5-45% by weight of the soap bar composition.

[0088] The present invention provides the use of starch in soap bar compositions according to the first aspect, wherein the starch or a derivative thereof is 10-35% by weight of the soap bar composition.

[0089] The present invention provides the use of starch in soap bar compositions according to the first aspect, wherein the starch is natural starch, pregelatinized starch, invert starch, or a mixture thereof.

[0090] The present invention provides the use of starch in a soap bar composition according to any one of the preceding claims of the first aspect, wherein the soap bar composition comprises 10-80% by weight of total fat matter.

[0091] The present invention provides the use of starch in soap bar compositions according to the first aspect, wherein the soap bar composition comprises 0.1-5% by weight of an electrolyte.

[0092] The present invention provides the use of starch in soap bar compositions according to the first aspect, wherein the soap bar composition comprises 10-45% by weight of water based on the weight of the soap bar composition.

[0093] Preferably, in the use of the soap composition of the present invention, the organic filler is starch, and it is present in the range of 5.5-45% by weight of the soap bar composition.

[0094] Preferably, in the use of the soap composition of the present invention, the colorant comprises an oil-dispersed pigment, and most preferably, the colorant is in the range of 0.01-2% by weight of the soap bar composition.

[0095] Preferably, in the application of the present invention, it is prepared in a plow-type shear mixer.

[0096] Example Example 1 - Soap Bar Soap bars are prepared according to the soap compositions of the present invention described in Table 1.

[0097] Fatty acids / fats according to the desired blend are weighed and neutralized with sodium hydroxide. Electrolytes sodium sulfate and sodium chloride are added during saponification. The saponified soap material is then converted into strips using a child drum and a noodler. Soap bars are formed by adding SLS, starch, trace ingredients, fragrances, etc., to a Sigma mixer and then extruding the strips through an extruder. The colorant is a pigment pre-dispersed in the oil and incorporated into the soap during the finishing process; it can optionally be added before or after the addition of starch during the Sigma mixing stage. Soap bars are prepared according to the soap composition of the present invention.

[0098] For transparency measurements, a Lux meter, model - Fluke 941 Light Meter - was used. The experiment was set up in a closed box with the Lux meter, using a 17 W LED bulb as the light source. The Fluke 941 measures visible light from fluorescent, metal halide, high-pressure sodium, or incandescent sources. One lux (lumen) is the illumination of a candela lamp held perpendicular to a one-meter square surface at a distance of one foot. A one-foot candela (Fc) refers to the illumination of a candela lamp held perpendicular to a one-meter square surface at a distance of one foot.

[0099] The distance between the light source and the top surface of the soap was maintained at approximately 35 mm, and the distance between the bottom surface of the soap and the Lux meter was maintained at approximately 100 mm. Readings were then acquired. Table 1

[0100] Therefore, it is clear from the data in Table 1 that when starch is used, the soap bars exhibit a significant difference in transparency compared to similar control compositions that do not use starch.

Claims

1. An extruded soap bar composition comprising: i. 10-80 wt% total fatty material; ii. 0.1-5 wt% electrolyte; iii. 10-45 wt% water; iv. 5.5-45 wt% starch; and v. 0.01-2 wt% colourant comprising an oil-dispersible pigment.

2. The soap bar composition according to claim 1, wherein the starch is 8-35 wt% of the soap bar composition.

3. The soap bar composition according to claim 1 or 2, wherein the starch is native starch, pregelatinised starch, modified starch or a mixture thereof.

4. The soap bar composition according to any one of the preceding claims 1 to 3, wherein the soap bar composition comprises 20-75 wt% total fatty material of the soap bar composition.

5. The soap bar composition according to any one of the preceding claims 1 to 4, wherein the soap bar composition comprises 1-4 wt% electrolyte of the soap bar composition.

6. The soap bar composition according to any one of the preceding claims 1 to 5, wherein the soap bar composition comprises 15-45 wt% water of the soap bar composition.

7. A method of enhancing the transparency of a soap bar composition, the method comprising the steps of: a. saponifying a fatty material with a base to produce a saponified material, wherein 0.1-5 wt% electrolyte of the soap bar composition is added during the saponification process; b. adding 5.5-45 wt% starch or modified starch and water of the soap bar composition to obtain a soap material; and c. extruding the soap material obtained from step (b) to obtain a soap bar according to any one of claims 1 to 6, wherein 0.01-2 wt% colourant of the soap bar composition is added before or after the addition of the starch.

8. Use of starch in an extruded soap bar composition to enhance the transparency of the soap bar composition compared to an equivalent soap bar composition without starch, the soap bar composition comprising: i. 10-80 wt% total fatty material; ii. 0.1-5 wt% electrolyte; iii. 10-45 wt% water; iv. 0.01-2 wt% colourant comprising an oil-dispersible pigment.

9. Use of starch in a soap bar composition according to claim 6, wherein the starch is 5.5-45 wt% of the soap bar composition.

10. The use according to any one of the preceding claims 7 to 9, wherein the starch is 8 to 35 wt% of the soap bar composition.

11. The use according to any one of the preceding claims 7 to 10, wherein the starch is native starch, pregelatinised starch, modified starch or a mixture thereof.

Images