PL188422B1 - Detergent bars containing an adjuvant for delivery of a beneficial agent and method of making such detergent bars - Google Patents

Abstract

Adjuvant powder compositions contain a benefit agent or agents and which powder compositions are used in detergent bar compositions to enhance delivery of the benefit agent. The carriers used to form adjuvants must have melting point high enough to survive spray-drying process. Specifically, the invention relates to a bar compositions comprising (A) about 1 % to 30 % powder comprising: (a) 1 % to 70 % by wt. powder benefit agent; (b) 15 % to 98 % by wt. powder carrier; (c) 1 % to 10 % by wt. powder water; and (d) 0 % to 30 % by wt. powder deposition/processing aid (e.g., surfactant, cationic polymer and/or hydrophilic polymer); and (B) 99 % to 70 % chips comprising 5 % to 90 % of a surfactant system wherein the surfactant is selected from the group consisting of soap, anionic surfactant, nonionic surfactant, amphoteric surfactant, cationic surfactant and mixtures thereof. The present invention also provides a process for making bars wherein (A) and (B) are separately prepared; wherein (a), (b), (c) and optional (d) are mixed at 40 DEG to 80 DEG C; wherein the mixture of (a) and (b) is spray dried at 80 DEG C to 200 DEG C at a pressure of 0.10 to 0.30 MPa; and wherein (A) and (B) are mixed, plodded, and extruded into a final bar.

Description

The invention relates to compositions for making detergent bars, in particular synthetic detergent bars, which are better able to deliver benefit agents to the skin. In particular, the invention includes an adjuvant powder comprising (a) skin benefit agents, (b) a carrier (e.g., soluble or partially soluble starches, water-soluble amorphous solids, or semi-crystalline water-soluble solids), (c) water, and (d) ) optionally deposition / processing aids; and this adjuvant powder is mixed with the flakes prior to milling, extruding and pressing the cubes. The present invention also relates to a method for producing such cubes.

Background of the invention

It is difficult to produce body wash bar formulations that can provide discernible benefits to the skin while not deleteriously affecting the bar making process itself (e.g., the benefit agent may be sticky and may clog equipment, or it may be highly viscous and cause the composition to becomes difficult to extrude) and / or would adversely affect the performance of the bar (e.g. foaming).

For example, generally water-insoluble benefit agents tend to reduce foamability. Moreover, even when incorporated, effective deposition of water-insoluble benefit agents onto the skin from such bars is difficult because a large amount of water-insoluble particles such as fatty acids or waxes can interact with the benefit agent particles or inhibit deposition of the benefit agent on the skin.

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Surprisingly, applicants have found that if the benefit agent is provided in the form of an adjuvant powder containing (1) the benefit agent; (2) a water-soluble (or at least partially soluble) carrier; (3) water and (4) optionally a deposition / processing aid selected from the group consisting of surfactants (e.g. cocoamidosulfosuccinate, aldobionamide), cationic polymers (e.g. Merquat® 100) and hydrophilic polymers (e.g. high polyalkylene glycols). molecular weight), it is possible to increase the deposition of the benefit agent (reaching amounts as large as those achieved with the use of bath gels instead of the bars) without compromising the parameters of the bar making process itself (and in some cases assisting the manufacturing process), and also without compromising product performance, such as like making foam.

The use of certain embedding polymers (e.g., cationic polymers) to enhance the deposition of water-insoluble particles (e.g., an emollient oil such as silicone) is known in the context of their deposition / application to the hair from liquid shampoo compositions. U.S. Patent No. 5,037,818 to Sime, for example, discloses cationic compounds to enhance deposition on hair of shampoo composition benefit agents.

WO 94/03152 (assigned to Unilever PLC) discloses liquid cleansing agents that efficiently deposit silicone oil on the skin using cationic polymers.

U.S. Patent No. 4,788,006 to Bolich, Jr et al. discloses shampoos with silicone particles of 2 to 50 microns, compositions also containing xanthan gum to improve the condition of the hair (conditioning).

However, the above publications do not disclose the deposition of the bar benefit agent. Furthermore, these publications do not disclose or suggest the use of adjuvant powders containing a benefit agent plus a specific spray-dried carrier (as well as an optional deposition / processing aid that may contain cationic polymers); nor do they disclose or suggest combining such adjuvant powders with the shavings of the bar to form the bar.

The prior art also discloses body wash bars containing a cationic polymer to provide a skin-improving (conditioning) and / or milder action (see US Patent 4,673,525 to Small et al; US 4,820,447 to Madcalf Jr. et al. and US-5,096,608 to Smali et al.). In these publications, the cationic polymer is not used in combination with a benefit agent to form a spray-dried adjuvant powder as described in this application.

U.S. Patent 3,761,418 to Parran Jr. describes detergent compositions containing water-insoluble (granular) substances and cationic polymers to enhance the deposition and retention of these granular substances on the surface washed with a detergent composition. In particular, enhanced deposition of the antimicrobial agent from a toilet detergent bar containing cationic polymers is disclosed. Again, this publication does not disclose or suggest the use of the adjuvant powder of the present invention (which must contain a carrier and optionally contain a cationic polymer) to enhance deposition of the benefit agent.

US-A-4808322, US-A-4148743 and US-A-5096608 disclose detergent bars made from a composition comprising soap chips or surfactant chips, a skin benefit agent, a carrier and water.

In co-pending application of applicant WO-A-9842815 (US 08/821504) filed on the same day as this application, there is disclosed bars made of an adjuvant powder that contains a cationic polymer. The adjuvants of this invention are not limited to containing a carrier having a melting point above 80 ° C, preferably above 100 ° C, as this application is broader with regard to, firstly, the formation of adjuvants containing the preferred agents (also containing cationic deposition aids) and co-extrusion. with chips, any method can be used (free drying; spray drying). In contrast, in the present invention, a carrier

188 422 must have a minimum melting point in order to withstand the conditions of the spray drying process.

Brief Description of the Invention

The present invention relates to bar formulations wherein 1% to 30% by weight of the powder composition, preferably 5% to 25%, more preferably 10% to 25% of the powder composition is mixed with 99% to 70%, preferably 95% to 75%. "Conventional" shavings bar containing 5% to 90% surfactant system. The adjuvant powder composition and the shavings are mixed together and extruded to form a bar composition capable of delivering the benefit agent to the skin at a much greater concentration than was previously possible.

The present invention relates to a detergent bar composition comprising, in addition to conventional ingredients, a skin benefit agent comprising (A) 1% to 30% by weight of an adjuvant powder comprising:

(a) 1% to 70% by weight of a powder of a skin benefit agent;

(b) 15% to 98% by weight of the powder, a carrier selected from a water-soluble starch, a water-soluble amorphous solid, a semi-crystalline water-soluble solid, or a mixture thereof, having a melting point greater than that of the drying chamber in which it was produced adjuvant powder;

(c) 1% to 10% by weight by weight of said powder, water; and (d) optionally up to 30 wt.% by weight of said powder, a deposition / processing aid selected from the group consisting of:

(i) an anionic, cationic, non-ionic and amphoteric surfactant;

(ii) cationic polymers; and (iii) hydrophilic polymers; and (B) 99% to 70% by weight flakes containing 5% dd 90% by weight of a surfactant, wherein the surfactant is selected from the group consisting of soap, anionic surfactant, non-ionic surfactant, amphoteric a surfactant, a cationic surfactant, and mixtures thereof, wherein the composition comprises an adjuvant powder made by a spray-drying process.

Preferably the skin benefit agent is made of an emulsion containing:

(a) 30-50% by weight of a benefit agent;

(b) 2-10% by weight of an emulsifier; and (c) the rest is water.

Preferably the composition according to the invention comprises a carrier which is a partially soluble starch selected from the group consisting of corn starch and potato starch.

Preferably the composition according to the invention comprises a starch carrier whose solution of 10% by weight or more dissolves in water to form a clear or substantially clear solution, optionally the starch is maltodextrin.

Preferably the composition comprises as a carrier:

(i) an alkali metal caseinate; or (ii) a semi-crystalline water-soluble solid.

It is also preferred that the composition comprises gelatin as carrier.

Preferably the composition according to the invention comprises a carrier with a melting point above 80 ° C, optionally above 100 ° C.

Preferably the composition of the invention comprises a deposition / processing aid which is a surfactant selected from sulfosuccinate, amidobetaine and aldonoamides.

Preferably the composition comprises a polyalkylene glycol with a molecular weight of from 1450 to 150,000 as the hydrophytic polymer.

The invention also relates to a method of producing a detergent bar comprising combining ingredients, kneading and extrusion, wherein the compositions (A) and (B) are separately produced; wherein components (a), (b), (c) and optionally (d) are mixed at a temperature

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40 ° C to 80 ° C; and the mixture of these ingredients is spray dried at a temperature of 80 ° C to 200 ° C and a pressure of 0.10 to 0.30 mPa; the compositions (A) and (B) are then mixed, squashed and extruded into a final cube.

Preferably, in the process of the invention, components (a), (b) and (c) are mixed to form a suspension.

Preferably, a maltodextrin solution is used as carrier (b) in the process according to the invention. ....

Preferably, components (a), (b) and (c) are heated to a temperature of about 70 ° C in the process of the invention.

Preferably, in the process according to the invention, component (a) is used in the form of an emulsion.

The amount of weighting (filling) with the beneficial agent in the final bar (e.g., about 10%) depends on the percentage of the beneficial agent in the powder. For example, if the powder contains 50% of the benefit agent oil, 20% of the powder (and 80% of the flakes) will be required to achieve 10% fill (ie 50% of 20%). If only 25% of the powder is a benefit, 40% of the powder (25% of 40%) mixed with 60% of the shavings will be required to achieve a 10% fill in the final bar.

Detailed description of the invention

The present invention relates to bar-making compositions that are capable of delivering a much larger amount of benefit agent to the skin or other substrate than has hitherto been obtainable from known bar compositions. More specifically, by making adjuvant powders containing the desired benefit agents and coextruding the benefit agent-containing powder with "regular" surfactant-containing chips, bars can be produced that deliver a significantly greater amount of benefit agent to the skin.

The invention includes benefit agent-containing powders having a specific new composition (e.g., benefit agent generally added as an emulsion; generally water-soluble carrier; water and optional deposition / processing aids), and bars made by coextruding these adjuvant and "conventional" powders. chips containing a surfactant.

A powder containing a beneficial agent

The benefit agent powders used in the invention contain a benefit agent "composition" (typically, but not necessarily, used in conjunction with an emulsion emulsifier); a generally water-soluble carrier; water and optionally a deposition / processing aid. As described below, these ingredients are generally mixed to form a slurry and dried (e.g., in a spray dryer) to form a powder. Each of the ingredients will be described in more detail below.

Benefit Agent Composition A benefit agent "composition" used in the invention can be a single benefit ingredient or a benefit agent added on a carrier. Moreover, the benefit agent composition may be a mixture of two or more compounds, one or all of which may have beneficial properties. In addition, the benefit agent itself may act as a carrier for other '' ingredients that may be added to the bar composition.

The benefit agent may be "emollient oil", which is a substance that softens the skin (the stratum corneum) by increasing its water content and keeping it soft by preventing the loss of water content.

Useful softeners include:

(a) silicone oils, resins and their modifications such as linear and cyclic polydimethylsiloxanes; amines, alkyl, alkylaryl, and aryl silicone oils;

(b) fats and oils including natural fats and oils such as jojoba, soybean, rice, avocado, almond, olive, sesame, apricot or peach seed, castor, coconut, mink oils, cocoa butter, beef tallow, lard, hardened oils obtained by the hydration of said oils, and synthetic mono-, di- and triglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride;

(c) waxes such as carnauba wax, spider wax, beeswax, lanolin, and derivatives thereof;

188,422 (d) hydrophobic plant extracts;

(e) hydrocarbons such as liquid paraffins, petroleum jelly, microcrystalline wax, ceresin, squalene, pristan, and mineral oil;

(f) higher fatty acids such as lauric, myristic, palmitic, stearic, behenic, oleic, linoleic, linolenic, isostearic and polyunsaturated fatty acids (PUFAs);

(g) higher alcohols such as lauryl, cetyl, stearyl, oleyl, behenyl, cholesterol, and 2-hexyldecanol alcohol;

(h) esters such as cetyl octanoate, myristyl lactate, cetyl lactate, isopropyl myristate, myristyl myristate, isopropyl palmitate, isopropyl adipate, butyl stearate, decyl oleate, cholesterol distearate isostearate, monostearol glycerol glycerinate, glycerol glycerol glycerate, glycerol glycerate glycerate, and alkyl tartrate;

(i) essential oils such as mint, jasmine, camphor, white cedar, bitter orange peel, rice, turpentine, cinnamon, bergamot, citrus unshiu, calamus, pine, lavender, bay, clove, hibiscus, eucalyptus, lemon, lemon Borage, thyme, peppermint, rose, sage, menthol, cineoleic, eugenol, geranium, citronella, bomeolic, linalool, geraniol, evening primrose, camphor, thymol, spiranthol, penene, limonene and terpene oils;

(j) lipids such as cholesterol, ceramides, sucrose esters and pseudoceramides as described in EP 556 957;

(k) vitamins such as vitamin A and E, and vitamin alkyl esters, including vitamin C alkyl esters;

(l) sunscreens such as octylmethoxy cinnamate (Parsol MCX) and butylmethoxybenzoylmethane (Parsol 1789);

(m) phospholipids; and (n) mixtures of any of the above ingredients.

A further requirement for the composition of the benefit agent of the invention is that the composition has a viscosity above 10,000 mPas (10,000 centipoise). Such viscosity may be caused by the fact that the individual emollients present may have a viscosity above this range or because the low viscosity skin emollients have been thickened to just such a viscosity.

A particularly suitable preferred agent is silicone, especially as mentioned silicones having a viscosity greater than about 10,000 mPas (10,000 centipoise). The silicone may be a resin and / or may be a mixture of silicones. An example is polydimethylsiloxane with a viscosity of about 60,000 mPas (60,000 centistokes).

The benefit agent is generally about 1% to 70%, preferably 30% to 60%, more preferably 40% to 60% by weight of the powder composition. As mentioned above, if the benefit agent is 50% of the powder and the powder is 20% of the powder / chip mixture that is extruded to form the final block (i.e. 20% powder / 80% of the chips), the benefit agent loading is 10%.

Carrier

In one embodiment of the invention, the carrier component may be any water-soluble starch including both partially soluble starches (such as corn starch or potato starch) and, more preferably, "true" water-soluble starches, i.e. starches in which at least A 10% by weight or more of the starch solution in water dissolves to form a clear or substantially clear solution. Examples of such starches include maltodextrin. Maltodextrin is particularly suitable.

In another embodiment of the invention the carrier may be a water-soluble amorphous solid such as, for example, an alkali metal caseinate (for example, sodium caseinate).

The carrier can also be a water-soluble semi-crystalline solid, such as, for example, gelatin.

The carrier used in the invention should have a melting point above 80 ° C, preferably above 100 ° C. While not wishing to be bound by theory, it is believed that such carriers are

With low melting points, they can effectively withstand the conditions of a spray-dryer powder manufacturing process without forming a sintered insoluble mixture. It should be understood that when the powders are made in a full scale spray dryer, carriers with lower melting points (theoretically as low as room temperature) may be used. All that is required is that the melting point of the carrier be higher than that of the drying chamber in which the adjuvant is produced.

The carrier generally comprises about 15% to 98%, preferably 30% to 50% of the powder composition. Water

The third component of the powder composition is water, which generally makes up about 1 to 10% of the powder. It should be noted that for some materials it may not be necessary to keep the water content extremely low, even if some extra water is required (e.g. to increase the flow properties of the powder) because the powder may be hygroscopic.

Deposition / processing aids

An optional ingredient in the powder composition is a deposition / processing aid which is selected from the group consisting of (1) anionic, cationic, non-ionic and amphoteric surfactants; (2) cationic polymers and (3) hydrophilic polymers;

The surfactant adjuvants of Group (1) may be any of a dozen suitable surfactants including, but not limited to, the following: alkyl ether sulfates, alkyl ethoxylates, alkyl ethoxycarboxylates, alkyl glyceryl ether sulfonates, alpha olefin sulfonates, acyl taurides, acyl taurylates, methyl acyl taurates, anionic acyl sarcosinates, alkyl phosphates, methyl glucose esters, protein condensates, ethoxylated alkyl sulfates, sultanates, alkyl sulfosuccinates, dialkyl sulfosuccinates, acyl lactates and mixtures thereof. The aforementioned detergents are preferably based on a C 8 -24 alkyl and acyl moiety, more preferably C 1-18.

Preferred surfactants include sulfosuccinates, amidobetaines such as cocamidopropyl betaine, and aldonamides; such as iactobio) namides;

Cationic polymers that can be used include cationic polymers of the type Polymer JR (e.g. Polymer JR-40) -produced by Union Carbide; Merquat® polymers such as Merquat 100 and Merquat 550, manufactured by Merck &Co; Jaguar® polymers such as Jaguar® C-14-S manufactured by Stein Hall; Mirapol® polymers such as Mirapol A15®, manufactured by Miranol Chemicals.

Other suitable cationic polymers may include dimethylaminoethyl methacrylate and acrylamide copolymers, and dimethyldiallylammonium chloride and acrylamide copolymers wherein the cationic to neutral nonionic ratio is selected such that the copolymer has the advantage of the cationic compound. Other suitable cationic polymers include cationic starches, e.g., StaLok® 300 and 400, manufactured by Staley Inc.

More cationic polymers that can be used are described in U.S. Patent No. 4,438,094 to Grollier / Allec issued March 20, 1984.

Hydrophilic polymers that can be used include polyalkylene glycols of molecular weight 1450 to 150,000, for example PEG 8000 from Union Carbide.

The above ingredients may constitute about 0 to 30%, preferably 0 to 15% of the powder composition.

Production

The adjuvant powder used in the invention is generally, but not necessarily, prepared by preparing a mixture of the benefit agent (usually as an emulsion), a water-soluble carrier (e.g., maltodextrin) and, optionally, a deposition / processing aid in the form of a suspension.

As mentioned, the benefit agent is generally introduced into the suspension as an emulsion. Such emulsions are either available or can be prepared in a laboratory depending on the availability of the particular benefit agent. For example, silicone is readily available as an emulsion from Dow®, while mineral oil is easily emulsified in the laboratory.

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Emulsions typically contain 30% -50% internal phase i.e. benefit agent, 2% -10% emulsifier and the balance is water.

The carrier is usually prepared as a solution and it is generally preferred to add the deposition / processing aid (if used) to the carrier solution. For example, starch can be prepared as a solution, usually containing a deposition / processing aid. More specifically, for example, a 50% solution may be prepared, maintained at 60-70 ° C, and while overhead stirring the maltudextrene solution may be added, if used, a deposition / processing aid.

Generally, the benefit agent emulsion and the carrier-processing aid solution are mixed, diluted with water to about 70%, and heated to about 70 ° C. Note that dilution is only used to ensure the correct viscosity to pump on a laboratory scale. On a larger scale, where higher viscosity fluids are easier to pump, dilution is not necessary. The final slurry is then pumped to a drying device, for example a spray dryer.

If a spray dryer is used, the slurry is pumped into the tube at a temperature of 80 ° C to 200 ° C, preferably 100 ° C to 200 ° C, through the nozzle. At the end of the nozzle, the slurry is atomized by a continuous flow of high pressure air. The water is then evaporated to leave a free flowing powder which retains the benefit agent.

Thus, in general, making the powder comprises mixing the carrier and benefit agent at a temperature of 40 ° C to 80 ° C, preferably 50 ° C to 70 ° C, passing the mixture through a spray dryer with a nozzle temperature of 80-200 ° C, preferably 100 ° C. C to 200 ° C at a pressure of 0.10-0.30 mPa and collecting the produced powder.

Typically, the adjuvant powder prepared comprises 0% to 30% deposition / processing aid, 1% to 70% benefit agent, 30% to 98% carrier, and 1% to 10% water.

The final powder is then incorporated into the bar composition, primarily by mixing it with the chips in an amalgamator. The adjuvant powder and the body wash shavings are then billet using conventional equipment and pressed into cubes. The adjuvant powder bars have enhanced deposition of the benefit agent over the bars where the benefit agent was added directly to the bar formulation in a mixing step.

Surfactant shavings

As mentioned, approximately 1% to 30% of the adjuvant is present in the final bar. The remaining ingredients that make up the final bar formulations (i.e., about 99 to 70% of the shavings) are shavings, which generally contain a surfactant system that defines the bar.

The chip surfactant system comprises about 5% to 90% by weight of the surfactant system, wherein the surfactant is selected from the group consisting of soap (pure soap surfactant systems are included), anionic surfactant, non-ionic surfactant surfactant, amphoteric / zwitterionic surfactant, cationic surfactant, and mixtures thereof The shavings may additionally contain other ingredients typically found in the final bar formulation, e.g. minor amounts of perfumes, preservatives, polymers to enhance skin feel, etc.

The surfactant system

The term "soap" is used herein in its common sense, ie, it denotes alkali metal or alkanolammonium salts of aliphatic alkane or alkene monocarboxylic acids. Sodium, potassium, mono-, di-, and triethanolamine cations or combinations thereof are suitable for the purposes of the present invention. Generally, sodium soaps are used in the compositions of the invention, but from about 1% to about 25% of the soap may be potassium soap. Suitable soaps are the well known alkali metal salts of natural or synthetic aliphatic (alkane or alkenic) acids having approximately

188,422 to 22 carbon atoms, preferably about 12 to about 18 carbon atoms. They can be described as alkali metal carboxylates of acrylic hydrocarbons having about 12 to 22 carbon atoms.

Coconut oil fatty acid soaps may have longer ends and a larger molecular weight range. These soaps having a fatty acid distribution of peanut or rapeseed oil, or their hydrated derivatives, can contain longer chain lengths over a wider range of molecular weight.

It is preferred to use soaps having a fatty acid breakdown of coconut oil or tallow, or mixtures thereof, as these are the most readily available fats. The proportion of fatty acids having at least 12 carbon atoms in coconut oil soap is about 85%. This amount will be greater if a mixture of coconut oil is used with fats such as tallow, palm oil or non-tropical nut oils or fats where the predominant carbon chain length is 4 or more. The soap preferred for use in the compositions of the present invention has at least about 85% fatty acids having about 12 to 18 carbon atoms.

Coconut oil used as soap may be replaced in whole or in part by other "high lauric" oils, that is, oils in which at least 50% of the total fatty acids are lauric or myristyl acids and mixtures thereof. Examples of such oils are typically tropical nut oils of the coconut grade. Examples include palm herb oil, babassu oil, ouricuri oil, tukum oil, kohune nut oil, marumuru oil, jabot herb oil, khakan herb oil, dika nut oil, and ucuhuba butter.

A preferred soap is a mixture of about 15% to about 20% coconut oil and about 80% to about 85% tallow. Such mixtures contain about 95% fatty acids having about 12 to about 18 carbon atoms. Preferably, the soap may be made from coconut oil, in which case the content of C12-18 fatty acids is about 85%.

The soaps may be unsaturated according to commercially acceptable standards. Usually, excessive unsaturation is avoided.

The soaps can be made by the classical kettle cooking process or by modern continuous methods in which natural fats and oils such as tallow or coconut oil or their equivalents are saponified with alkali metal hydroxides using well known procedures.

Alternatively, soaps can be made by neutralizing fatty acids such as lauric (Cl2), myristic (Cl4), palmitic (Cl6), or stearic (Cl8) acid with an alkali metal hydroxide or carbonate.

The anionic surfactant can be, for example, an aliphatic sulfonate such as a primary alkane sulfonate (e.g., C8-22), a primary alkane disulfonate (e.g., C8-C22), a Cs-22-alkene sulfonate, a C8-22-hydroxyalkane sulfonate, or an alkylglyceryl ether sulfonate (AGS); or an aromatic sulfonate such as alkyl benzene sulfonate.

The anionic surfactant may also be an alkyl sulfate (e.g., C12-18 alkyl sulfate) or an alkyl ether sulfate (including alkyl glyceryl ether sulfates). Among the alkyl ether sulfates there are compounds of the formula:

RO (CH 2 CH ₂ O) _n SO ₃ M wherein R is alkyl or alkenyl having 8 to 18 carbon atoms, preferably 12 to 18 carbon atoms, n is an average value of greater than 1.0; preferably more than 3; and M is a solubilizing cation such as sodium, potassium, ammonium or substituted ammonium. The ammonium and sodium lauryl ether sulfates are preferred.

The anionic may also be alkyl sulfosuccinates (including mono- and dialkyl, e.g. C ₆ - ₂ 2-sulfosuccinates); alkyl and acyl taurates, alkyl and acyl sarcosinates, sulfoacetates, C8-22 alkylphosphates and phosphates, alkylphosphate esters and alkoxyalkylphosphate esters, acyl lactates, C8-22 monoalkyl succinates and maleates, sulfoacetates, alkyl isethlucosides and acylglucosides.

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The sulfosuccinates can be monoalkyl sulfosuccinates of the formula:

R ⁴ O ₂ CCH ₂ CH (SO ₃ M) CO ₂ M; and amido-MEA-sulfosuccinates of the formula:

R ⁴ CONHCH ₂ CH2O2CCH ₂ CH (SO3M) CO ₂ M;

wherein R4 is C822alkyl and M is a solubilizing cation.

Sarcosinates are generally defined by the formula:

R ¹ CON (CH 3) CH ₂ CO 2M where R ¹ is C 8-20 alkyl and M is a solubilizing cation.

Taurates are generally defined by the formula:

R ² CONRfCH ₂ CH ₂ SO ₃ M wherein R ^z is C 8-20 alkyl, R is C 1-6 alkyl and M is a solubilizing cation.

C8-18 acyl isethionates are particularly preferred. These esters are formed by the reaction between alkali metal isethionates with mixed aliphatic fatty acids with 6 to 18 carbon atoms and an iodine number less than 20. At least 75% of mixed fatty acids have 12 to 18 carbon atoms and up to 25% have 6 to 10 carbon atoms.

The acyl isethionates, if present, generally range from about 10% to about 70% by weight of the total bar composition. Preferably, this component is present in an amount from about 30% to about 60%.

The acyl isethionate may be an alkoxylated isethionate such as described by Ilardi et al. US Patent 5,393,466, incorporated herein by reference. These compounds have the following general formula:

About X Y

II I I

RCO-CH-CH ₂ - (OCH-CH ₂ ) m-SO ₃ 'M ⁺ where R is an alkyl group of 8 to 18 carbon atoms, m is an integer from 1 to 4, X and Y are hydrogen or an alkyl group containing 1 to 4 carbon atoms and M + is a monovalent cation such as, for example, sodium ···, potassium or ammonium.

The amphoteric detergents that can be used in the present invention contain at least one acid group. It can be a carboxylic acid or a sulfonic acid group. They contain a quaternary nitrogen atom and are therefore quaternary amido acids. In general they should contain alkyl or alkenyl groups of 7 to 18 carbon atoms. They usually fall under the general formula:

OR ²

II I

R * - [- C-NH (CH ₂ ) _n -] _m -N ⁺ -XY

AND

R ³ wherein R ¹ is alkyl or alkenyl of 7 to 18 carbon atoms;

R 2 and R ³ are each independently alkyl, hydroxyalkyl or carboxyalkyl of 1 to 3 carbon atoms;

n is 2 to 4; m is 0 to 1;

X is alkylene of 1 to 3 carbon atoms, optionally substituted with hydroxyl, and

Y is -CO ₂ - or -SO3-.

Suitable amphoteric detergents falling within the general formula above include simple betaines of formula:

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R ²

AND

R ¹ - N ⁺ - CH ₂ CO ₂ 'and amidobetaines of the formula:

R ²

AND

R ¹ - CONH (CH2) n - N ⁺ - CH2CO ₂ 'I.

R ³ where n is 2 or 3.

In both formulas, R ¹ , R ² and R ³ are as previously defined. R ¹ in particular may be a mixture of C ₂ and C 14 alkyl groups derived from coconut such that at least half, preferably at least three quarters of the groups R ¹ have 10 to 14 carbon atoms. R ² and R ³ are preferably methyl.

A further possibility is that the amphoteric detergent is a sulfobetaine with the formula:

R ²

AND

R ¹ - N ⁺ - (CH ₂ ) ₃ SO ₃

AND

R ³ or

R ²

AND

R ¹ - CONH (CH2) m - N ⁺ - (CH2) ₃ SO ₃ I.

R ³ where m is 2 or 3, or a variation thereof in which the group (CH 2) ;, SO; 3 is replaced by

OH

AND

- CH ₂ CHCH ₂ -SO ₃ '

3

In these formulas, R, R and R are as previously defined.

The nonionic surfactant which can be used as the second component in the invention includes, in particular, the reaction products of compounds having a hydrophobic group and a reactive hydrogen atom, for example, aliphatic alcohols, acids, amides or alkyl phenols, with alkylene oxides, especially ethylene oxide, both alone and with the oxide. propylene. Specific nonionic detergent compounds are condensates of alkyl- (C6-22) -phenols with ethylene oxide, condensation products of aliphatic (Cg-1g) -primary or secondary linear or branched alcohols with ethylene oxide, and products prepared by condensation of ethylene oxide with reaction products of the oxide propylene and ethylenediamine. Other so-called nonionic detergent compounds include long chain quaternary amine oxides, long chain quaternary phosphine oxides and dialkyl sulfoxides.

The nonionic surfactants can also be sugar amides, such as polysaccharide amides. A specific surfactant can be

188,422 one of the lactobionamides described in US 5,389,279 to Au et al, incorporated herein by reference, or may be one of the sugar amides described in US 5009814 to Kelkenberg, incorporated herein by reference as literature reference.

Examples of cationic detergents are quaternary ammonium compounds such as halogenated alkyldimethylammonium compounds.

Other surfactants that may be used are described in US Patent No. 3,723,325 to Parran Jr, and in "Surface Active Agents and Detergents" (Vol. I and Π) by Schwartz, Perry and Berch; both publications are also included in this application by reference.

Although the bar may be a pure soap bar, preferably the chip surfactant system (constituting the surfactant system of the bar) includes:

(a) a first synthetic surfactant that is an anionic surfactant; and (b) a second synthetic surfactant selected from the group consisting of a second anionic surfactant different from the first, nonionic surfactant, amphoteric surfactant, and mixtures thereof.

The first anionic surfactant may be any of the above-mentioned, but is preferably a C8-6 isethionate as described above. Preferably the acyl isethionate constitutes 10% to 90% by weight, preferably 10% to 70% of the total bar composition.

The second surfactant is preferably sulfosuccinate, betaine or a mixture of the two. The second surfactant or mixture of surfactants generally comprises 1% to 10% of the total bar composition. It is particularly preferred that the composition comprises sufficient sulfosuccinate to make up 3-8% of the total bar composition and sufficient betaine to make up 1-5% of the total bar composition.

Production

The adjuvants used in the invention are combined with "surfactant" chips in a hopper or spiral blender where they can be comminuted (eg, made into a more pliable mass), squashed, extruded, and cut.

Except in the embodiments and comparative examples, or where not otherwise indicated, all numbers in the specification indicating amount of material or reaction and / or use conditions are to be understood as having been modified by the word "about".

The following examples are intended to further illustrate the invention and are not intended to limit the invention in any way.

All percentages are by weight unless otherwise stated.

Example 1

Preparation of the bar with spray-dried adjuvant

Suspension: 232.5 g of water was heated to over 40 ° C in a large beaker. 232.5 g of maltodextrin was added while stirring, then stirred and heated until a clear solution was obtained. 6.2.5 g of Merquat 100 cationic polymer, 40% active ingredient were added. After homogenization, 465 g of Dow 1650 silicone emulsion (50% active ingredient 60,000 mPas (60,000 cps) internal phase) were added and the temperature was kept at 50-70 ° C. In case the mixture was too thick for pumping, an additional 640.8 g of water was added to bring the water content of the mixture to 70%.

Preparation of the powder: the mixture was pumped through a Yamato, Pulvis GB 22 mini lab scale spray dryer. The inlet temperature was set to 200 ° C and the atomization pressure was set to 0.15 mPa. The produced powder was collected from the cyclone product receiving vessel at the top of the drying chamber. In this case, the size of the spray nozzle does not matter. The nozzle was a typical continuous flow nozzle.

Making a cube, powder from the spray dryer was introduced into the cube die as follows:

(1) 1.8 kg (4 lbs) of Dove chips [trademark] and 0.45 kg (1 lb) of spray-dried powder are mixed dry in a suitably large container or amalgamator

188,422 (2) the mixture was passed through a Weber-Selander two-stage kneader, which produced pasta in a first stage and billets in a second stage.

(3) the billets were cut to the appropriate length to fit the die of the press, and cubes were made from them

The resulting cubes contained approximately 9.3% of 60,000 mPas (60,000 cps) of poly (dimethylsiloxane).

In vitro deposition test

The specimens were treated by pulling 10 times 25 cm ^{2 of} wet pigskin, foaming the resulting liquid for 30 seconds, and then rinsing the skin for 10 seconds with water at 36.3-39.4 ° C (90-95 ° F). The treated pig skins were then placed in a vial and the silicone was extracted with 10 milliliters of xylene. The skin was then removed from the vial and the extraction solvent was analyzed for silicone content with the Inductively Couped Plasma Atomie Emission Spectroscopy.

The following results were obtained:

Adjuvant AND B C. 60000 CPS PDMS * 49% 48.85% 48.7% Maltodextrin 49% 48.85% 48.7% Merguat 100 0.0% 0.3% 0.6% Water 2.0% 2.0% 2.0%

80% Dove / 20% A 80% Dove / 20% B 80% Dove / 20% C 2.4 mg / cm ² ± 0.6 2.4 mg / cm ² ± 1.0 2.4 mg / cm ² ± 0.7

Deposition of silicone on pig skin is comparable to that provided by shower gels.

Additional examples of spray-dried powders

% by weight Ingredient 1 2 3 4 5 6 7 8 9 10 maltodextrin 49 46 46 46 46 46 24 49 gelatine 49 Na caseinate 49 PDMS * 49 46 46 46 46 46 49 49 70 Geahlene ** 49 PEG 8000 5 Lactobionamide 5 4 CAPB *** 5 CAS **** 5 Merguat 100 5

* polyditnetylsiloxane 60,000 mPas * (60,000 centipoise) ** commercial concentrated mineral oil 50,000 mPas (50,000 centipoise) * ♦ * cocoamidobetaine **** cocoamidosulfobetaine

The columns do not include the water added to make up to 100%, the empty spaces in the columns mean that the given component was not added, the supplement was water.

Publishing Department of the UP RP. Circulation of 50 copies

Price PLN 4.00.

Claims (14)

Patent claims A composition for the manufacture of a detergent bar containing, in addition to conventional ingredients, a skin benefit agent, characterized in that it comprises: A) 1% to 30% by weight of an adjuvant powder containing: (a) 1% to 70% by weight of a powder of a skin benefit agent; (b) 15% to 98% by weight of the powder, a carrier selected from a water-soluble starch, a water-soluble amorphous solid, a semi-crystalline water-soluble solid, or a mixture thereof, having a melting point greater than the temperature of the drying chamber in which adjuvant powder was prepared; (c) 1% to 10% by weight by weight of said powder, water; and (d) optionally up to 30 wt.% by weight of said powder, a deposition / processing aid selected from the group consisting of: (i) an anionic, cationic, non-ionic and amphoteric surfactant; (ii) cationic polymers; and (iii) hydrophilic polymers; and (B) 99% to 70% by weight flakes containing 5% to 90% by weight of a surfactant system, wherein the surfactant is selected from the group consisting of soap, anionic surfactant, non-ionic surfactant, amphoteric surfactant active cationic surfactant, and mixtures thereof, wherein the composition comprises an adjuvant powder made by a spray-drying process. 2. A composition according to claim 1 The skin benefit agent of claim 1, wherein the skin benefit agent is made from an emulsion containing: (a) 30-50% by weight of a benefit agent; (b) 2-10% by weight of an emulsifier; and (c) the rest is water. 3. A composition according to p. The carrier as claimed in claim 1 or 2, characterized in that the carrier is a partially soluble starch selected from the group consisting of corn starch and potato starch. 4. A composition according to p. A carrier according to claim 1 or 2, characterized in that the carrier is a starch whose solution of 10% by weight or more is dissolved in water to form a clear or substantially clear solution, or the starch is maltodextrin. 5. A composition according to p. The method of claim 1 or 2, characterized in that the carrier comprises: (i) an alkali metal caseinate; or (ii) a semi-crystalline water-soluble solid. 6. A composition according to p. 5. A composition according to claim 5, characterized in that the carrier comprises gelatin. 7. A composition according to p. The method of claim 1 or 2, characterized in that it contains the carrier with a melting point above 80 ° C, optionally above 100 ° C. 8. A composition according to p. The composition of claim 1 or 2, wherein the deposition / processing aid is a surfactant selected from sulfosuccinate, amidobetaine and aldonamides. The composition according to claim 1 or 2, characterized in that the hydrophilic polymer is a polyalkylene glycol with a molecular weight of 1450 to 150,000. 10. A method for producing a detergent block comprising combining ingredients, kneading and extrusion, characterized in that separately preparing a composition (A) containing 1% to 30% by weight of an adjuvant powder comprising 188,422 (a) 1% to 70% by weight of a powder, a skin benefit agent; (b) 15% to 98% by weight of the powder, a carrier selected from a water-soluble starch, a water-soluble amorphous solid, a semi-crystalline water-soluble solid, or a mixture thereof, having a melting point greater than the drying chamber temperature, in for which an adjuvant powder was prepared; (c) 1% to 10% by weight by weight of said powder, water; and (d) optionally up to 30 wt.% by weight of said powder, a deposition / processing aid selected from the group consisting of: (i) an anionic, cationic, non-ionic and amphoteric surfactant; (ii) cationic polymers; and (iii) hydrophilic polymers; and a composition (B) comprising 99% to 70% by weight of a turnings containing 5% to 90% by weight of a surfactant system, wherein the surfactant is selected from the group consisting of soap, anionic surfactant, nonionic surfactant, amphoteric surfactant surfactant, cationic surfactant, and mixtures thereof; wherein components (a), (b), (c) and optionally (d) are mixed at a temperature of 40 ° C to 80 ° C; and the mixture of these ingredients is spray dried at a temperature of 80 ° C to 200 ° C and a pressure of 0.10 to 0.30 mPa; the compositions (A) and (B) are then mixed, squashed and extruded into a final cube. 11. The method according to p. A process as claimed in claim 10, in which components (a), (b) and (c) are mixed to form a slurry; 12. The method according to p. A process as claimed in claim 10 or 11, characterized in that a maltodextrin solution is used as carrier (b). 13. The method according to p. The process according to claim 10 or 11, wherein components (a), (b) and (c) are heated to a temperature of about 70 ° C. 14. The method according to p. The process of claim 10, wherein component (a) is used in the form of an emulsion.