CZ296195B6 - Detergent bar containing wetting agent - Google Patents

Abstract

In the present invention, there is disclosed a detergent bar containing wetting agent wherein the detergent bar comprises A) 1 to 30 percent by weight of adjuvant powder composition prepared by spray-drying process and containing a) 1 to 70 percent by weight of powder benefit agent, b) 15 to 98 percent by weight of powder carrier with melting point higher than the temperature of drying chamber in which the adjuvant is made, c) 1 to 10 percent by weight of water d) 0 to 30 percent by weight of powder deposition/processing aid being selected from the group consisting of i) anionic, cationic, non-ionic and amphoteric surfactants, ii) cationic polymers and iii) hydrophilic polymers and B) 99 to 70 percent by weight of basic material containing 5 to 90 percent by weight of surfactants being selected from the group consisting of soap, anionic surfactant, nonionic surfactant, amphoteric surfactant, cationic surfactant and mixtures thereof.

Description

Washing cube containing wetting agent

Technical field

It is an object of the present invention to provide a detergent bar containing a wetting agent. The beneficial agent is delivered to the wash bar in the form of an adjuvant comprising a) a skin beneficial agent, b) a carrier, c) water, d) optionally aids to facilitate storage or processing. This adjuvant is mixed with the base material prior to grinding, extrusion and compression of the bars. The invention also relates to a method of making such bars.

BACKGROUND OF THE INVENTION

It is very difficult to manufacture personal hygiene cubes so that there is sufficient deposition of fabrics having a beneficial effect from these cubes on the skin while avoiding difficulties in the manufacture of such cubes. Typically, the cause of these problems is the beneficial substance, which may be tacky and clog the apparatus or may have high viscosity and cause diffusion of the starting material and / or may adversely affect the performance of the bar, such as foaming.

Usually, water-insoluble substances with a beneficial effect tend to reduce the formation of foam. Furthermore, even when deposited on the skin, efficient deposition of water-insoluble substances is always difficult due to the presence of a large number of other water-insoluble particles, such as fatty acids or waxes, with which the substance has a beneficial effect in competition. . This inhibits the deposition of the substance with a beneficial effect on the skin.

It has now been unexpectedly found that it is possible to increase the deposition of the beneficial agent by adding it to the cubes composition in the form of a powdered adjuvant comprising 1. a beneficial skin agent, 2. a water soluble or at least 3. a water-soluble and optionally auxiliary agent for facilitating the storage or processing of a wetting agent, for example, coconut oil amidosulfosuccinate or aldobionamide, cationic polymers such as Merguat 100, and hydrophilic polymers such as higher molecular weight polyalkylene glycols. In this way, the deposition of a substance with a beneficial effect comparable to that of shower gels can be achieved without affecting the processing and, in some cases, by affecting it, and without adversely affecting the performance properties, for example the volume of the foam formed.

The use of some polymers, such as cationic polymers, to facilitate the deposition of water-insoluble substances, such as softening oils, such as silicone oils is known from US 5,037,818 (Si), which relates to liquid hair shampoo deposition. In particular, the beneficial effect of cationic polymers is reported.

According to WO 94/03152 (Unilever PLC), silicone oil can be effectively deposited from liquid cleaning compositions using cationic polymers.

US 4,788,006 (Bolih, Jr. et al.) Relates to silicone shampoos having a diameter of 2 to 50 microns, which compositions contain xanthan gum as a hair conditioner.

However, neither of these publications relates to the deposition of a beneficial substance from washing blocks. In addition, these publications do not teach or suggest the use of powdered adjuvants with a specific carrier and optionally with a storage or processing aid which may contain cationic polymers, nor suggest a combination of these adjuvants and a base material for the manufacture of washing bars.

-1 CZ 296195 B6

Personal hygiene cleansing bars are also known which contain a cationic polymer to improve skin condition and / or soften the skin, for example, the cleansing bars of U.S. Pat. No. 4,673,525 (Smal et al.), U.S. Pat. No. 4,820,447 (Medcalf, Jr.). and others) and US 5,096,608 (Smali et al.).

In these patents, the cationic polymer is not used in conjunction with a substance having a beneficial effect to form a powder adjuvant, as in the washing bars of the invention.

US 3,761,418 (Parran, Jr.) discloses a wetting agent composition comprising water-insoluble particulate materials and cationic polymers to enhance deposition and retention on a surface washed with said composition. Specifically, an increased deposition of antimicrobials on a toilet bowl is described. Said patent does not disclose or suggest the possible use of a carrier aid and optionally a cationic polymer to enhance the deposition of the beneficial agent.

US 4,808,322 discloses a washing bar comprising a soap or wetting agent, a skin benefit agent, a carrier and water. However, the skin-beneficial agent is not part of the powder adjuvant. US 4,148,743 discloses a process for the manufacture of toilet soaps containing high molecular weight ethylene oxide polymers. The soaps obtained have a smooth surface such as conventional soaps, emollients or other skin-friendly substances, but are not added as part of the powdered adjuvant. According to US 5,096,608, a non-irritating toilet soap can be obtained from a mixture of synthetic gentle wetting agents, moisturizers and certain soaps. However, the beneficial substances are not added as part of the powder adjuvant.

The co-pending patent application WO 98/42818 concerning the increased deposition of beneficial detergent compositions from a detergent bar containing a beneficial substance containing a beneficial agent and a polymer discloses the possibility of combining a cationic polymer-containing powder adjuvant with a base material for the manufacture of detergent bars . Adjuvants are mentioned which are not limited to carriers having a melting point above 80, preferably above 100 ° C, since the application in the broad sense relates first to the formation of a beneficial agent containing a beneficial agent and a cationic polymer and then to coextrusion. of the base material adjuvant. For this reason, any process, for example spray drying or freeze drying, can be used to obtain the powdered adjuvant. On the other hand, the carrier of the present invention must have the lowest melting point so that the material can be spray dried.

SUMMARY OF THE INVENTION

BACKGROUND OF THE INVENTION The present invention relates to a detergent bar comprising 1 to 30, preferably 5 to 25, in particular 10 to 25% by weight of powder adjuvant mixed with 99 to 70, preferably 95 to 75% by weight, of a conventional material. containing 5 to 90% by weight of a surfactant system. The powder adjuvant and the base material are mixed and extruded into cubes, with which the skin-beneficial substance can be deposited in an amount far higher than that known in the art.

Accordingly, the present invention provides a detergent bar containing a surfactant

A) 1 to 30% by weight of a spray drying adjuvant consisting of

(a) 1 to 70% by weight of a substance having a beneficial effect on the skin;

(b) 15 to 98% by weight of a powdered carrier having a melting point above the temperature of the drying chamber in which the adjuvant is formed;

-2GB 296195 B6

(c) 1 to 10% by weight of water; and

d) 0 to 30% by weight of an increased deposition or processing aid selected from the group consisting of i) anionic, cationic, nonionic and amphoteric surfactants, ii) cationic polymers, and iii) hydrophilic polymers, and

B) 99 to 70% by weight of a base material comprising 5 to 90% by weight of a surfactant selected from the group of soap, anionic surfactants, nonionic surfactants, amphoteric surfactants, cationic surfactants and mixtures thereof.

The amount of skin benefit agent in the final wash bar, for example 10% by weight, depends on the amount of the agent in the powder adjuvant, for example if the powder material contains 50% of the beneficial agent, 20% of the adjuvant material and 80 % of the base material to achieve a substance content with a beneficial effect of 10% in the resulting cube. If the auxiliary material contained only 25% of the beneficial substance, it would be necessary to mix 40% of the auxiliary and 60% of the base material for the manufacture of the washing bars.

Another object of the present invention is to provide a process for the manufacture of said scrubbers by first separately preparing components A and B, wherein components a), b), c) and preferably also d) are mixed at a temperature of 40-80 ° C, a mixture of and (b) are spray dried at 80 to 200 ° C at 0.10 to 0.30 MPa, then components A and B are mixed and extruded onto the resulting wash bar.

Thus, when using the scouring pads of the present invention, higher amounts of fabric can be deposited with a beneficial effect on the skin or other substrate. In the preparation of the adjuvant containing the beneficial agent and the extrusion of the adjuvant and the base material, it is possible to prepare wash bars that meet the above requirements.

The invention therefore also relates to an adjuvant comprising a skin-beneficial agent having a specific novel composition (the beneficial agent, usually added in the form of emulsions, a water-soluble carrier, water and optionally an aid for easier storage and processing). The invention also relates to the resultant bars prepared by coextrusion of this auxiliary agent and a conventional base material for the manufacture of washing bars.

I. Auxiliary agent containing a skin-beneficial substance

Powder-containing powdered materials having a beneficial effect on the skin usually form a composition in which the skin-beneficial substance is usually in the form of an emulsion, optionally with an emulsifier, further comprising a carrier, usually water-soluble, water and optionally an adjuvant for the skin. easier storage and processing. As will be described hereinafter, these components are usually blended into a suspension and then dried, for example by spraying to form a powdered material. The individual components of this material will be described in more detail below.

Material containing a substance with a beneficial effect on the skin

The skin-containing material of the present invention may be a single component or may also contain a carrier. It may also be a mixture of two or more substances, one or more of which have favorable properties. In addition, the beneficial agent may itself be a carrier for the other ingredients to be added to the resulting mixture.

In particular, the skin-beneficial substance may be an "emollient oil", a skin softening agent, especially strata comeum, by increasing the water content of the layer, so that the skin remains soft due to the slowed water content of the layer.

-3GB 296195 B6

Preferred emollients include:

(a) silicone oils, gums and modified materials of that type, such as linear and cyclic polydimethylsiloxanes, amino-, alkyl-, alkylaryl- and arylsilicone oils;

(b) fats and oils, including natural fats and oils, such as jojoba oil, soybean oil, rice oil, avocado, almond, olive, sesame oil, castor, coconut, cocoa fat, beef tallow, lard and hardened oils prepared by hydrogenating the above oils in addition, they may be synthetic mono-, di- and triglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride,

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

d) hydrophobic plant extracts,

(e) hydrocarbons such as liquid paraffins, petrolatum, microcrystalline wax, ceresin, squalene, landing and mineral oils;

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

(g) higher alcohols such as lauryl, cetyl, stearyl, oleyl or behenyl alcohol, cholesterol; or

2-hexadecanol,

h) esters such as cetyloctanoate, myristyl lactate, cetyl lactate, isopropyl myristate, myristyl myristate, isopropyl palmitate, isopropyl adipate, butyl stearate, decyl oleate, cholesterol isostearate, glycerol monostearate, glycerol stearate, glycerol tristate, alkyl lactate, alkyl lactate

(i) essential oils such as menthol, jasmine essential oils, camphor, white cedar essential oils, oranges, turpentine, cinnamon, bergamot, citrus essential oils, coniferous essential oils, lavender, myrtle, cloves, eucalyptus oil, lemon oil, thyme, mint, rose, menthol, cineol, eugenol, citral, citronel, bomeol, linalool, geraniol, primula oil, camphor, thymol, spirantole, pinene, limonene and terpenoid oils,

j) lipids, for example cholesterol, ceramides, sucrose esters and pseudoceramides, described in EP 556 957;

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

(l) sunscreen agents such as octylmethoxylcinnamate (Parsol MCX) or butylmethoxybenzoylmethane (Parsol 1789);

(m) phospholipids; and

n) mixtures of any of the foregoing.

Another requirement for a material having a skin-beneficial material is a viscosity of greater than 10,000 mPa.s. This viscosity can be provided by a softening composition having a viscosity above this value or a softening composition having a lower viscosity after concentration to the desired values.

A particularly preferred material having a beneficial effect on the skin is silicone, especially silicone with a viscosity of more than 10,000 mPa.s. It may also be a mixture of silicones. An example is a polydimethylsiloxane having a viscosity of about 60,000 mPa · s.

-4GB 296195 B6

The skin-beneficial substance usually constitutes 1 to 70, preferably 30 to 60, and in particular 40 to 60% by weight of the powdered material. As mentioned above, if the beneficial agent constitutes 50% of the powder and the powdered material constitutes 20% of the resulting extrusion composition, the resulting beneficial drug content will be 10%.

Carrier

In one embodiment, the carrier can be any water-soluble starch, including partially soluble starches, for example, corn or potato starch, but preferably water-soluble starches of which at least 10% by weight dissolve in water to clear or substantially clear starch. solution. Examples are maltodextrin, which is particularly preferred.

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

Semi-crystalline water-soluble solids such as gelatin can also be used as a carrier. The carrier of the invention should have a melting point greater than 80, preferably greater than 100 ° C. While not wishing to be bound by any theoretical explanation, it is likely that high melting point carriers more easily withstand spray drying without forming an insoluble mixture. In particular, the melting point of the carrier needs to be higher than the temperature in the spray chamber when drying the material containing the beneficial material.

The carrier will usually comprise 15 to 98%, preferably 30 to 50% by weight of the powder material.

Water

The third component of the powdered material is water, which usually constitutes 1 to 10% of the material. It should be noted that in some cases it is not necessary to keep the amount of water as low as possible, since the powder material produced is hygroscopic like the lacquer.

Auxiliary tool for easier storage and processing

An optional component of the powdered material is said adjuvant, which is usually selected from the group of 1. anionic, cationic, nonionic and amphoteric surfactants, 2. cationic polymers and 3. hydrophilic polymers.

The auxiliary components of Group 1 may be any wetting agent, for example, alkyl ether sulfates, alkyl ethoxylates, alkyl ethoxycarboxylates, alkyl glyceryl ether sulfonates, alphaolefin sulfonates, acyltaurides, methyl acyl taurates, N-acylglutamates, acyl isethionates, alkyl sulfonates, esters, alkyl esters, betaines, sultains, alkylsulfosuccinates, dialkylsulfosuccinates, acyllactylates and mixtures thereof. The abovementioned surfactants preferably contain alkyl groups of 8 to 24 and in particular 10 to 18 carbon atoms or acyl groups of the same chain length.

Preferred wetting agents are sulfosuccinates derived, for example, from coconut oil, amidobetaines, for example cocoamidopropyl betaine, and aldonamides, such as lactobionamides.

Cationic polymers for use herein may include polymers of the polymer type JR (e.g. Polymer JR 400, Union Carbide), Merquat such as Merquat 100 and Merquat 550 (Merk and Co.), Jaguar such as Jaguar C14S (Stein Hall) or Mirapol such as Mirapol A15 (Miranol Chemicals).

Other suitable cationic polymers may be copolymers of dimethylaminoethyl methacrylate and acrylamide and copolymers of dimethyldialylammonium chloride and acrylamide in which

The ratio of cationic to neutral nonionic moieties is selected so that the resulting polymer has a cationic charge. Other suitable cationic polymers are cationic starches such as StaLok 300 and 400 (Staley Inc).

Other useful cationic polymers have been described in US 4,438,094 (Grollier / Allec) dated March 20, 1984.

Useful hydrophilic polymers include polyalkylene glycols having a molecular weight of 1450 to 150,000, such as PEG 8000 (Union Carbide).

The above-mentioned components may comprise 0 to 30%, preferably 0 to 15% by weight of the powder material.

Preparation

The powder adjuvants of the invention are usually prepared by preparing a mixture of a skin benefit agent, usually in an emulsion of a water-soluble carrier, for example maltodextrin, and optionally excipients to facilitate storage or processing to form a suspension.

As already mentioned, the skin-beneficial substance is usually added in the form of an emulsion. These emulsions are supplied or can be prepared in the laboratory from the desired substance with beneficial effect. For example, silicone is commonly supplied in the form of an emulsion (Dow), whereas a mineral oil emulsion is more readily prepared in the laboratory. The emulsion usually contains 30 to 50% of the internal phase, i.e. the emulsion. 2-10% emulsifier, the rest being water.

The carrier is usually prepared in the form of a solution, wherein the storage and processing aid is added to the carrier solution when used. For example, starch may be prepared in the form of such an excipient-containing solution. For example, maltodextrin can be prepared as a 50% solution, maintained at 60-70 ° C, at which temperature an adjuvant can be added to the solution while stirring.

In general, the skin-emulsion emulsion and carrier and optionally excipient solution are mixed, diluted to about 70% water content and heated to about 70 ° C. It should be noted that the mixture is diluted only to obtain sufficient viscosity to render the solution pumpable on a laboratory scale. On a larger scale, liquids of higher viscosity can be prepared and therefore no such dilution is required. The resulting suspension is then pumped to a drying device, for example for spray drying.

If a spray-drying device is used, the suspension is pumped into a tube at the end of which is a nozzle having a temperature of 80 to 200, preferably 100 to 200 ° C. At the end of the nozzle, the material is atomized by supplying air under high pressure. The water is converted into steam to give a free-flowing powder containing a substance having a beneficial effect on the skin.

Thus, in general, the powdered material is obtained by mixing the carrier and the skin-beneficial substance at a temperature of 40 to 80, preferably 50 to 70 ° C, passing the mixture through a spray device having a nozzle temperature of 80 to 200, preferably 100 to 200 DEG C. at a pressure of 0.10 to 0.30 MPa and the resulting powder is separated.

The adjuvant will typically contain 0 to 30% storage and processing aid, 1 to 70% skin-beneficial, 30 to 98% carrier and 1 to 10% water.

The resulting powder material is then used to make the washing bars by mixing them with the base material for making the bars. Then, the resulting mixture is extruded using a conventional machine and compressed into washing blocks. Of these cubes, a substance with a beneficial effect is stored much better

-6GB 296195 B6 than from washing bars, which were made by directly adding a substance having a beneficial effect on the skin during mixing of the material for the manufacture of washing bars.

Basic material

As already mentioned, the adjuvant constitutes from 1 to 30% of the material for the manufacture of washing bars. The remaining components, ie. 99 to 70% are constituted by a base material which generally comprises solvent systems.

In particular, the base material comprises 5 to 90% by weight of a surfactant system selected from the group of soap (including pure soap), anionic surfactant, nonionic surfactant, amphoteric surfactant, surfactant of both types, cationic surfactant and mixtures thereof. In addition, the base material may contain other ingredients typically used in basewash base materials, such as small amounts of perfume, preservatives, polymers to provide a pleasant skin feel, and the like.

Wetting system

The term "soap" refers to alkali metal salts of aliphatic alkane or alkene monocarboxylic acids or alkanolammonium salts thereof. Sodium, potassium, mono-, di- and triethanolammonium salts or combinations thereof are particularly suitable for the purposes of the invention. Sodium soaps are generally used in the bars of the invention, but 1 to 25% of the soaps may be potassium soaps. Useful soaps are the well-known alkali metal salts of natural or synthetic aliphatic alkanoic acids or alkenyl acids of 12 to 22, preferably 12 to 18 carbon atoms. These substances may also be referred to as alkali metal carboxylates of hydrocarbons having from 12 to 22 carbon atoms.

Soaps containing coconut fatty acids fall within the lower molecular weight range. Soaps with peanut or rapeseed oil fatty acids or their hydrogenated derivatives fall within the higher molecular weight range.

It is preferred to use coconut oil or tallow fatty acid soaps or a mixture of these fatty acids, since these are readily available materials. The proportion of fatty acids with at least 12 carbon atoms in soap containing coconut oil is approximately 85%. This proportion will be increased when a mixture of coconut oil and other fats such as tallow, palm oil, non-tropical nut oils and other fats are used, in which the fatty acids usually have a length of 16 carbon atoms or higher. Preferably, a soap containing at least 85% fatty acids having a chain length of 12 to 18 carbon atoms is used for the purposes of the invention.

The coconut oil used for soap manufacture may be partially or completely replaced by other oils, in particular oils or fats, in which at least 50% of the total fatty acid is lauric or myristic acid and mixtures thereof. These oils are usually referred to as coconut oil tropical nuts. Examples include palm kernel oil, Attalea funifera palm oil, fat oil, ouricuri palm oil, cohune, murumuru, jabot, khakan, dika or ucuhuba.

A preferred soap is a mixture of 15 to 20% coconut oil and 80 to 85% tallow. This mixture contains about 95% of C12-18 fatty acids. Such a soap can be prepared from coconut oil, in which case 85% of the fatty acids have a chain length of 12 to 18 carbon atoms.

The soaps may contain unsaturated bonds according to a commonly used standard. However, too much unsaturation is not desirable.

-7EN 296195 B6

The soaps may be made by the conventional method of boiling or by a more modern continuous processing process which saponifies natural fats or oils, for example tallow, coconut oil or their equivalents, by the action of an alkali metal hydroxide in a known manner. Soaps can also be prepared by neutralizing fatty acids, for example, lauric acid (C1 2), myristic acid (C1 4), palmitic acid (C 16) or stearic acid (C 18), with alkali metal hydroxide or carbonate.

The anionic surfactant for the purposes of the invention may be, for example, an aliphatic sulfonate, for example a primary alkanesulfonate of 8 to 22 carbon atoms, a primary alkane disulfonate of 8 to 22 carbon atoms, an alkene sulfonate of 8 to 22 carbon atoms, a hydroxyalkane sulfonate of 8 to 22 carbon atoms or an alkylglyceryl ether sulfonate aromatic sulfonates such as alkylbenzenesulfonate may also be used.

The anionic surfactant may also be an alkyl sulfate, for example of 12 to 18 carbon atoms, or an alkyl ether sulfate, including glyceryl ether sulfates, of which alkyl ether sulfates are particularly preferred as represented by the general formula:

RO (CH ₂ CH ₂ O) _n SO ₃ M wherein R represents an alkyl or alkenyl of 8 to 18, preferably 12 to 18 carbon atoms, n has an average value greater than 1.0 and preferably greater than 3 and M represents a cation, allowing dissolution such as sodium, potassium, ammonium or substituted ammonium cation. Ammonium and sodium lauryl ether sulfate is preferred.

The anionic surfactant may also be an alkylsulfosuccinate, including mono- and dialkylsulfosuccinates, for example of 6 to 22 carbon atoms, alkyltaurate, acyltaurate, alkyl sarcosinate, acyl sarcosinate, sulfoacetates, alkyl phosphates of 8 to 22 carbon atoms, phosphates, alkyl alkyl phosphate esters, and alkoxy alkyl phosphate and alkoxy alkyl phosphate in each case having from 8 to 22 carbon atoms, sulfoacetates, alkyl glycosides and acylisethionates.

The sulfosuccinates may be monoalkyl sulfosuccinates of the general formula

R ⁴ O ₂ CCH ₂ CH (SO ₃ M) CO ₂ M and amide-MEA sulfosuccinates of general formula

R ⁴ CONHCH ₂ CH ₂ O ₂ CCH ₂ CH (SO ₃ M) CO ₂ M wherein R ⁴ represents an alkyl of 8 to 22 carbon atoms and M represents a solubilizing cation.

In general, sarcosinates can be represented by the formula

R ¹ CON (CH ₃ ) CH ₂ CO ₂ M, wherein R ¹ is an alkyl of 8 to 20 carbon atoms and M is a solubilizing cation.

Taurates can be represented by the formula:

R ² CONR ³ CH ₂ CH ₂ SO ₃ M where R ² is alkyl of 8 to 20 carbon atoms,

R ³ is C 1 -C 4 alkyl;

M is a solubilizing cation.

-8GB 296195 B6

Particularly suitable substances are acyl isethionates having 8 to 18 carbon atoms in the vacyl moiety. These esters are prepared by reaction between an alkali metal isethionate and a mixture of aliphatic fatty acids of 6 to 18 carbon atoms with an iodine number of less than 20. At least 75% of the fatty acids in the mixture contain 12 to 18 carbon atoms and up to 25% have a chain length of 6 to 18 10 carbon atoms.

Acyl isethionates, when present, generally comprise from 10 to 70% by weight of the total weight of the bar. Preferably, this component is present in an amount of 30 to 60% by weight.

The acyl isethionate may be an alkoxylated isethionate, for example, the compound described in US 5,393,466 (Ilardi et al.), Which may be represented by the formula:

R = CO-CH-CH _and - (OCH-CH3) wherein R is alkyl of 8 to 18 carbon atoms, m is an integer of 1 to 4, X and Y are hydrogen or alkyl of 1 to 4 carbon atoms and M ⁺ is a monovalent cation, for example sodium, potassium or ammonium.

The amphoteric surfactants which can be used according to the invention contain at least one acid group. It may be a carboxylic or sulfonic acid group. In addition, these substances contain a quaternary nitrogen atom and are therefore quaternary amido acids. These substances should generally contain an alkyl or alkenyl group of 7 to 18 carbon atoms. These substances will conform to the structural formula

O

where R ¹ is alkyl or alkenyl of 7 to 18 carbon atoms,

R ² and R ³ independently represent alkyl, hydroxyalkyl or carboxyalkyl of 1 to 3 carbon atoms, m is 2-4, n is 0-1,

X represents an alkylene radical having 1 to 3 carbon atoms optionally substituted by a hydroxyl group and

Y is -CO ₂ - or -SO ₃ -.

Suitable amphoteric surfactants within the above general formula include simple betaines of formula and amidobetaines of formula:

R ^ KF-CH CHCOj

-9EN 296195 B6

R ²

AND

R ^X -CONH (CH 2) n N ⁺ -CH ₂ CO ₂ '

R ³ wherein n is 2 or 3.

In both formulas, the substituents are as defined above. R < ¹ & gt ^{; is in} particular a mixture of alkyl groups of 12 to 14 carbon atoms derived from coconut oil, so that at least half, preferably at least two-thirds of these groups contain 10 to 14 carbon atoms. R ² and R ³ are preferably methyl.

The amphoteric surfactant may also be a sulfobetaine of the general formula:

R ²

R ³ -N ⁺ - (CH ₂ ) ₃ SO ₃ '

AND

R ³ or

R ² i

R ¹ -CONH (CH ₂ ) _m -N * ~ (CH ₂ ) ₃ SO ₃ '

R ³ where m is 2 or 3, or may be variants of these substances in which - (CH ₂ ) ₃ SO ₃ 'is replaced by

OH Z

-CH ₂ CHCH ₂ SO ₃ '

In these formulas, the substituents are as defined above.

Nonionic surfactants which can be used as the second component, in particular the reaction products of the compounds containing the hydrophobic group and the reactive hydrogen atom, are, for example, aliphatic alcohols, acids, amides or alkylphenols with alkylene oxides, in particular ethylene oxide as such or together with propylene oxide. Specific nonionic surfactants are the condensation products of alkylphenols of 6 to 22 carbon atoms in the alkyl moiety and ethylene oxide, the condensation products of aliphatic primary or secondary linear or branched alcohols of 8 to 18 carbon atoms with ethylene oxide, and products formed by the condensation of ethylene oxide with reaction products of propylene oxide and ethylenediamine. Other so-called nonionic surfactants include long-chain tertiary amine oxides, long-chain tertiary phosphine oxides, as well as dialkyl sulfoxides.

The nonionic surfactants may also be sugar amides, for example polysaccharide amides. For example, the surfactant may be from the group of the lactobionamides described in U.S. Pat. No. 5,389,279 (Au et al.) Or may be sugar amides described in U.S. Pat. No. 5,009,814 (Kelkenberg).

Examples of cationic surfactants include quaternary ammonium compounds, for example alkyldimethylammonium halides.

Other surfactants that can be used have been described in US 3,723,325 (Parran, Jr.) and in U.S. Pat.

Surface Active Agents and Detergents, Vol. I and II, Schwartz, Perry and Berch.

-10GB 296195 B6

Although the wash bar may contain pure soap, the solvent system in the wash bar is preferably formed

(a) the first synthetic anionic surfactant; and

(b) a second synthetic surfactant, which may also be anionic but different from the first surfactant or nonionic or amphoteric, or may be a mixture of these surfactants.

The first anionic surfactant may be selected from the aforementioned surfactants, but is preferably an isethionate of 8 to 18 carbon atoms. The acyl isethionate will preferably comprise from 10 to 90%, in particular from 10 to 70% by weight, based on the total weight of the washing bar.

The second surfactant is preferably a sulfosuccinate, betaine or a mixture of the two types of surfactant. The second surfactant or mixture of surfactants will usually comprise 1 to 10% by weight of the wash bar. A particularly preferred composition contains a sufficient amount of sulfosuccinate to contain 3 to 8% by weight of the washing bar and 1 to 5% by weight of betaine based on the weight of the washing bar.

Treatment

The auxiliary agent according to the invention is mixed with the base material for the production of the washing cubes in a container or mixing device, then extruded into semi-finished products and then cut and pressed.

The following examples are intended to illustrate the invention. In these examples, unless otherwise indicated, all percentages are by weight.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Production of spray bars with spray drying aid.

Preparation of the suspension

232.5 g of water are heated to a temperature above 40 ° C in a large vessel. 232.5 g of maltodextrin are added with stirring and the mixture is stirred and heated until a clear solution is obtained. Then 62.5 g of cationic polymer Merquat 100 with 40% efficiency is added. After forming a homogeneous mixture, 465 g of a 50% Dow 1650 silicone emulsion having a viscosity of 60,000 mPa · s are added and the temperature is maintained at 50-70 ° C. In those cases where the mixture was too dense to pump, 640.8 g of water were added so that the mixture contained 70% water.

Manufacture of powder

The mixture was pumped into a Pulvis GB 22 mini spray-drying laboratory apparatus (Yamato). The inlet temperature was set at 200 ° C and the pressure used for atomization was set to

0.15 MPa. The resulting powder was taken from a cyclone-type separator from the bottom of the drying chamber. In this case, the nozzle diameter was not important. A conventional spray nozzle was used for spray drying.

-11 CZ 296195 B6

Production of washing cubes

The powder obtained after spray drying was added to the base material for the manufacture of the washing bars as follows:

1. 1.8 kg of base material (Dove) and 0.45 kg of spray dried powder were dry blended in an appropriate mixer.

2. The mixture was passed through a two-stage Weber-Selander extruder, where in the first stage thin strands were formed and in the second stage intermediate materials were formed.

3. Intermediates in the form of billets were cut to length corresponding to the size of the mold and pressed into the resultant washing bars.

The resulting wash bars contained approximately 9.3% polydimethylsiloxane with a viscosity of 60,000 mPa.s.

In vitro deposition test

The test was performed by moistening a portion of 25 cm ² of porcine skin and then rubbing it with the resultant wash bar 10 times, forming a foam over 30 seconds, and then rinsing the skin with water at a temperature of 36.3 to 39.4 seconds for 10 seconds. Deň: 32 ° C. The pig skin was then placed in a vial and the silicone was extracted using 10 ml of xylene. After the skin was removed, the solvent was analyzed for silicone content by spectroscopy. The results are summarized in the following table:

Auxiliary AND (B) C PDMS 60000cps 49% 48,89% 48.7% Maltodextrin 49% 48,89% 48.7% Merquat 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

The deposition of silicone on pork skin is comparable to that of shower gels.

Other examples of spray dried powders (percent by weight)

Component 1 2 3 4 5 6 7 8 9 10 Maltodextrin 49 46 46 46 46 46 24 49 Gelatine 49 Caseinate Na 49 PDMS ^X 49 46 46 46 46 46 49 49 70 Geahlene " 49 PEG 800 5 Lactobionamide 5 4 CAPB ^XXX 5 CAS ™ 5 Merquat 100 5

- 12GB 296195 B6

X polydimethylsiloxane with 60,000 mPa / s (60,000 cp), XX commercially available mineral oil of 50,000 cp, XXX cocoamidopropylbetain, xxxx cocoamidosulfosuccinate.

The amount of constituents in each column does not give 100%, the rest being water.

Claims (14)

PATENT CLAIMS A detergent bar comprising: (A) 1 to 30% by weight of a spray drying adjuvant comprising (a) from 1 to 70% by weight of a skin-friendly powder; 15 to 98% by weight of a powder carrier having a melting point higher than the temperature of the drying chamber in which the adjuvant is formed; c) 1 to 10% by weight of water; and d) 0 to 30% by weight of an excipient for ease of storage or processing. (i) anionic, cationic, nonionic and amphoteric surfactants; (ii) cationic polymers; and (iii) hydrophilic polymers; and (B) 99 to 70 wt. nonionic surfactants, amphoteric surfactants, cationic surfactants, and mixtures thereof. Washing bar according to claim 1, characterized in that it contains a skin-friendly substance which is in the form of an emulsion before spray-drying. Washing bar according to claim 2, characterized in that the emulsion containing the beneficial substance comprises a) 30 to 50% by weight of the skin-beneficial substance, b) 2 to 10% by weight of an emulsifier and c) the rest is water. Washing bar according to one of Claims 1 to 3, characterized in that it contains, as carrier, partially soluble starch from the group of maize starch and potato starch. Washing bar according to one of Claims 1 to 4, characterized in that it contains, as carrier, water-soluble starch to a solution with a starch content of 10% or more by weight to form a clear or substantially clear solution, or the starch is maltodextrin. Washing bar according to one of Claims 1 to 5, characterized in that it contains a water-soluble amorphous solid as carrier. Washing bar according to one of Claims 1 to 6, characterized in that it contains as carrier: i) an alkali metal caseinate, ii) a semi-crystalline water-soluble solid or iii) gelatin. Washing bar according to one of Claims 1 to 7, characterized in that it comprises a carrier having a melting point of greater than 80, preferably greater than 100 ° C. Washing bar according to one of Claims 1 to 8, characterized in that the auxiliary substance for easier storage or processing is a sulphosuccinate, amidobetaine and aldonamide surfactant. - 13GB 296195 B6 Washing bar according to one of Claims 1 to 9, characterized in that it contains, as a hydrophilic polymer, a polyalkylene glycol having a molecular weight of 1450 to 150 000. A method for producing a scrubber according to any one of claims 1 to 10, characterized in that components A and B are separately prepared, wherein components a), b), c) and optionally d) are mixed at a temperature of 40 to 80 ° C, the mixture of components a), b) and c) is spray dried at 80 to 200 ° C and at a pressure of 0.10 to 0.30 MPa, then components A and B are mixed and extruded to the resulting bar. Process according to claim 11, characterized in that components a), b) and c) are mixed into a suspension. 13. The method of claim 11 or 12, wherein the carrier in component b) is a maltodextrin solution. The process according to any of claims 11 to 13, wherein the mixture of components a), b) and c) is heated to a temperature of about 70 ° C.