ES2329398T3 - SOLID SOAP WITH REDUCED CRACK TRAINING. - Google Patents

Abstract

Solid soap piece (I) comprises thiosulfate salts (greater than 0.2%, preferably 0.5% and less than 5%), fatty acid salt (50-90%) and water (greater than 1%).

Description

Solid soap with reduced formation of cracks

The present invention relates to solid soap in which the formation of cracks is minimal.

The desire to look clean and careful is probably as old as the human being. Dirty skin and a Little care hair is the ideal breeding ground and home to the pathogens and parasites of all kinds. The inclination for body hygiene has intensified a lot and already in the 60's 20th century in addition to the "classic" soap could also be formulated liquid detergent media with fresh synthetic surfactants developed. In daily life we can no longer do without baths and showers since then and currently a variety of products for cleaning the different parts of the body. TO despite the multitude of products offered soap bars They represent a significant percentage in the market.

Surfactants, for example, well-known alkaline salts of the higher fatty acids, it is say the classic "soaps" are amphiphilic substances which can emulsify polar organic substances in water.

In body cleansing the soaps in pill they play an important role. These have been manufactured by continued saponification of free fatty acids with alkalis, the concentrate of basic soaps and spray drying. Be distinguishes between pure alkaline soaps, which contain exclusively salts of fatty acids and even fatty acids free and the so-called "Combibars", bar soaps, which in addition to fatty acid salts they have other surfactants synthetic, in general fatty alcohol ether sulfates or fatty acid isothionates. There are also pills syndet detergent, called "syndetbars" that do not contain salts of fatty acids and which contain only surfactants synthetic

Only in Germany are sold annually several million bars of soap for body hygiene. The market demands in this article of mass consumption are without Older embargo every day: Soap bars should not only clean the skin but also care, grease i.e. avoid a dried and represent a protection against influences external

Of course, soap is expected to be tolerated. by the skin in a special measure, but also when using it should provide a lot of foam and provide a pleasant feeling for the skin during and after application. In this sense, the Manufacturers are constantly looking for new ingredients for Soap bars that meet this requirement profile.

In addition the soap bars during use many times they tend to form cracks in the central part of soap and the edges of the folds often acquire a Gray or dark color. This does not harm the detergent power of the soap but if the optical appearance and the Skin sensation when using the bar of soap. The objective is to remedy these bad aspects and that during their use the aesthetic and sensory aspect is appropriate, that is, it keep the smooth surface of the soap.

The main components are the alkaline salts of the fatty acids of natural oils and fats, preferably of C 12 -C 18 chain length. Since lauric acid soaps foam especially well, palm kernel and coconut oils rich in lauric acid are the preferred raw materials for the manufacture of pure soaps. The sodium salts of the fatty acid mixtures are consistent, the pasty and soft potassium salts. For saponification the diluted potassium or sodium soda is added to the fat raw materials in a stoichiometric ratio, so that in the prepared soap there is an excess of soda of at most 0.05%. Many times soaps are manufactured
not directly from fat, but from the breakdown of fat from the fatty acids obtained.

The usual additives in soaps are fatty acids, fatty alcohols, lanolin, lecithin, oils vegetables, partial glycerides and other substances similar to greases for oily clean skin, antioxidants such as ascorbyl palmitate or tocopherol to prevent self oxidation of soaps (rancidity), complex-forming means such as nitrile triacetate to bind heavy metal traces that could catalyze the oxidized deteriorated substance, the essences of perfumes to obtain the desired aromatic notes, the Coloring coloring the soap bars and if desired special additives

The most important types or classes of soaps fine are:

-

Soaps with a toilet 20-50% coconut oil in a fatty preparation, up to a 5% fat percentage and 0.5-2% of perfume oil, they are the most important part of fine soaps;

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Luxury soaps with up to 5% off oils or essences for perfumery especially expensive

-

Deodorant soaps with additives based of deodorant substances, such as the 3,4,4'-trichlorocarbanility (triclocarbano);

-

Creamy soaps with a percentage especially high in greasy and creamy substances for skin;

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Baby soaps with components for skin care and greasing, such as extracts from chamomile, in any case little scented.

-

Soaps to protect the skin with high percentages of greasing substances as well as others protective additives, such as proteins;

-

Transparent soaps with additives from glycerin, sugar among others, which prevent the crystallization of salts  of fatty acids in the melt of hardened soaps and give thus a transparent aspect;

-

Floating soaps with a thickness <1, caused by air bubbles incorporated in a controlled manner during manufacturing

-

Soaps with abrasive additives for Very dirty hand cleaning.

In washing with soap, the pH of the bleach in the wash is 8-11. This alkalinity modifies the natural acidic skin envelope (pH 5-6). It regenerates very quickly on normal skin, but on sensitive or damaged skin it can lead to irritation. The basis of Syndet soaps are synthetic anionic surfactants, which with additional substances, greases and other additives can make soap-like tablets. Its pH is variable and is mostly adjusted to pH 7 or the acidic skin layer of pH 5.5. They have an exceptional detergent power, they form foam in any type of water, even in sea water, the percentage of greasing additives must be clearly higher than that of normal soaps due to its intense degreasing and detergent power. The downside is the high
price.

Document DE 103 18 325 A1 reports on a detergent tablet, which is equivalent to a combination of substances surfactants and elastomeric polymers.

EP 1 174 493 A1 reports on a soapy product containing talc, certain alkaline soaps  of fatty acids and greasing substances, so that these products are free from alkyl-oligo-glycosides.

Document DE 512428 informs about soaps solids with a low fatty acid content below 80% with ammonium thiosulfate.

WO 03/085077 A1 reports on a soapy product containing certain fatty acid salts pre-gelatinized alkali and starch derivatives and crosslinked crosswise.

A very common phenomenon in solid soaps It is the tendency for cracks to form in the bar of soap. This can cause it to break into small pieces.

Crack formation can be measured as follow:

1. Installation : Clamping device with wire hook or threads to hold the soap bar to be examined. Plastic tube filled with cold running water. Heated chamber at a temperature between 21ºC and 22ºC and a relative air humidity of 50-55%.

Only soap bars are used representative for the test. Soap bars should have at least 24 hours

2. Procedure : Soaps with a coinage should be submerged in water on the smooth side. A hole is drilled vertically on one of the smooth sides. The distance between the hole and one of the wide sides is about 2 cm. The distance between the hole and both small sides should be large enough. In round soaps, the hole must also be at a distance of about 2 cm from the edge (see figure 1). The soap is fixed with a wire hook or a thread to the suspension device. One half of the soap should be submerged in water. It is to ensure that the wide side of the soap is oriented parallel to the surface of the water. Duration of the test: 12 days.

Day 1: Soap must remain four hours at ambient temperature in the water. After 4 hours the water soap and let it drip into the device suspension.

Drying time of 44 hours. After first assessment.

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Day 3: Soap must remain in the water Four hours at room temperature. After these 4 hours you take out of the water and let it drip hung from the device subjection.

Drying time of 44 hours. After first assessment.

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Day 3: Soap must remain in the water Four hours at room temperature. After these 4 hours you take out of the water and let it drip hung from the device subjection.

Drying time of 44 hours. After second assessment.

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Day 5: Soap must remain in the water Four hours at room temperature. After these 4 hours you take out of the water and let it drip hung from the device subjection.

Drying time of 68 hours. After third assessment.

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Day 8: Soap must remain in the water Four hours at room temperature. After these 4 hours you take out of the water and let it drip hung from the device subjection.

Drying time of 44 hours. After fourth assessment.

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Day 10: Soap must remain in the water Four hours at room temperature. After these 4 hours you take out of the water and let it drip hung from the device subjection.

Drying time of 44 hours. Then fifth and Last assessment

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2. Evaluation Sample quantity: 5 tablets of soap at least

one

The use of thiosulfate in concentrations of up to 0.2% as a color stabilizing medium in solid soaps It is very common but it is no solution to the problem.

The purpose of the present invention consisted of in eliminating the shortcomings of current technology and developing alkaline cleaning preparations with poor crack formation and Good feeling for the skin.

Surprisingly it has been discovered that by the use of thiosulfate in concentrations greater than 0.2% is they can make very stable solid soaps with a formation of cracks reduced. A first idea of the invention is thus a solid soap bar, containing more than 0.2% of a salt of thiosulfate, preferably more than 0.3% and very especially more 0.5% and less than 5%, 50-90% in acid salts  fatty, water in an amount of 5-35% and additional anionic surfactants in a percentage lower than 10%

Even for the technician it is difficult to make a forecast on the long-term stability of such systems and in particular about the influences on the formation of cracks in the solid soap bars and really the properties of this formula surprise.

It is preferred that the pH of an aqueous solution at 1% is greater than 8. This way you get a feeling in the typical soap skin.

It is preferred that the fatty acids are composed of 50-95% by weight of fatty acids C_ {16} -C_ {18} and 5-50% in weight of C 12 -C 14 fatty acids, in particularly by 50-95% by weight of fatty acids C_ {16} -C_ {18} and by 5-50% in weight of C 12 -C 14 fatty acids, preferably by 50-85% by weight of acids C 16 -C 18 fatty and by a 10-50% by weight of fatty acids C_ {12} -C_ {14}. In this way they are obtained soft soap bars, suitable for cosmetics with a good behavior in regard to its foam.

It is preferable that they also contain a 1-10% by weight of free fatty acids with 12 to 22 atoms of C.

The bar of soap according to the invention contains additional anionic surfactants in a percentage in weight less than 10%, preferably less than 5%, especially less than 2.5%. In this way a better foaming is achieved in hard water

It is preferable that a bar of compliant soap to the invention contain 1-99% by weight of acids fatty with 12-22 C atoms, in the form of their soap alkaline, in particular of a basic soap, for example, one with sodium talowate, sodium cocoate and / or fatty acid salt of palm kernel In this way, high quality soaps can be manufactured at good price. As fatty acids to make basic soaps are they use linear fatty acids with 12 to 22 C atoms, for example, lauric, myristic, palmitic, stearinic acid, arachidic and behenic, but also unsaturated fatty acids, by example, palmitoleinic, oleic, linoleic, linolenic acid, arachidonic and erect. Technical blends are preferred, such as which are obtained from vegetable and animal fats and oils, for example, coconut oil fatty acid and stearic fatty acid or sebaceous.

Especially preferred are mixtures of pieces of coconut stearic fatty acid, in particular a mixture 50-95% by weight of stearic acid C_ {16} -C_ {18} and 5-50% of C 12 -C 14 coconut fatty acid. In in particular a mixture of 50-80% by weight of acid stearic C_ {16} -C_ {18} and a 20-50% coconut fatty acid C_ {12} -C_ {14}.

Fatty acids are used in the form of their alkaline soaps, usually as sodium soaps. Soaps they can be manufactured from fats and oils directly by Caustic soda hydrolysis and glycerin separation. Preferably the soapy products according to the invention contain an additional proportion of 1-10% in Weight of free fatty acids with 12-22 C atoms. These may be identical to the fatty acids in basic soap and be incorporated into the basic soap during hydrolysis. But it is preferably add free fatty acids after hydrolysis and after the concentrate process, before drying.

The bar of soap contains water in a amount of 5-35% by weight. The water content is It is conditioned on the one hand by the manufacturing process, on the other hand it acts favorably on the use properties of Soaps

It is preferable that the bar of soap has a melting point higher than 45 ° C. Thus the bar of soap It is even suitable for the tropics.

It is also preferred that salts of thiosulfate of the alkali metal thiosulfate group inorganic, preferably sodium thiosulfate.

It is also preferred that the bar of soap according to the invention contain auxiliary substances and / or additives,  such as synthetic surfactants, oleic bodies, emulsifiers, greasing media, fats, waxes, glycerin, stabilizers, film formers, cationic polymers, talc, pigments, vitamins, biogenic active substances, media preservatives, coloring and flavoring substances, among others, in a concentration of less than 10%, preferably less than 5%, especially less than 1% in the soapy product. The invention also includes a bar of soap according to the invention enclosed in a box or case of water-soluble fleece, a net or perforated sheet. A product model can thus be available totaly new.

The invention also includes the use of salts of thiosulfate for reducing the formation of cracks in soaps

Exemplary measurement results for soap tablets with 0.2% and 0.6% sodium thiosulfate

Soaps with 0.2% sodium thiosulfate (comparative example) :

Sample amount: 5 bars of soap

3

30

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Soap with 0.6% sodium thiosulfate :

Sample amount: 5 bars of soap

5

fifty

The preparation according to the invention has A lot of advantages:

- In addition to the characteristics of care and / or cleaning, handling a cosmetic product represents for The consumer a very important point. The formula described here It has very good application properties. Can be extended Good for the skin and easily washed after use.

- The product has a very stable good This guarantees product quality and efficiency. uniforms over time.

- Very good foaming and detergent efficiency Very powerful

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According to the invention the cleaning pads solids may contain elastomeric polymers as true alkaline soaps or "Combibars".

It is preferable in the sense of the present invention that the product according to the invention contains one or several complex formers in a total concentration of 0.1 up to 2.0% by weight and in particular at a concentration of 0.1 up to 1.0% by weight with respect to the total weight of the preparation.

The complexer (s) may be preferably chosen from the group of usual compounds, of so that at least one substance in the group consisting of acid tartaric and its anions, citric acid and its anions, acids aminopolycarboxylic acids and their anions (such as acid ethylenediaminetetraacetic acid (EDTA) and its anions, iminodisuccinate tetrasodium (IDS), nitrileacetic acid (NTA) and its anions, acid hydroxyethylenediaminetriacetic (HOEDTA) and its anions, acid diethylene amino pentaacetic acid (DPTA) and its anions, acid trans-1,2-diaminocyclohexanetratracetic (CDTA) and its anions).

According to the invention, it is preferred especially hydroxyethylene diaminetriacetic acid and in particular sodium salt of hydroxyethylene diaminetriacetic acid (Na 3 HEDTA) as a complex former.

According to the invention it is preferable that the product according to the invention contains one or more wetting agents cutaneous in a concentration of 0.5 to 10% by weight, and preferably in a concentration of 2.0 to 6.0% in weight, with respect to the total weight of the preparation.

According to the invention the wetting agents of the Preferred skin are, for example, glycerin, lactic acid and / or lactates, in particular sodium lactate, butylene glycol, propylene glycol, biosaccharides rubber-1, soybeans glycine, ethylhexyloxyglycerin, pyrrolidoncarboxylic acid and the urea. It is also an advantage to use moisturizing emulsions. polymers of the group of water-soluble and / or polysaccharides inflatable in water and / or forming gels with the help of water. In Particularly preferred are, for example, hyaluronic acid, chitosan and / or a fucose-rich polysaccharide, which appears in the Chemical Abstracts under the registration number 178463-23-5 and for example under the name Fucogel®1000 of the company SOLABIA S.A.

In accordance with the invention, the use of glycerin as a skin moisturizing agent.

It is preferable according to the invention that the product according to the invention contain abrasives (as particles of polyethylene peeling), bright substances, gas bubbles (air bubbles), substances with effects, layers of different colored refractive indexes, pearl luster pigments, Effect pigments, optical illuminators, micas, droplets of emulsion and / or oil.

It is also preferable in the sense of present invention that the cleaning tablet according to the invention contains one or more coloring substances. To do this they can use in particular all known dyes, Water soluble and suitable for cosmetics.

In addition the preferred active substances in the sense of the present invention are natural active substances and / or its derivatives, such as alpha-liponic acid, the phytoene, D-biotin, coenzyme Q10, alpha-glucosylroutine, carnitine, carnosine, natural and / or synthetic isoflavonoids, creatine, creatinine, taurine and / or beta-alanine as well as acid 8-hexadecene-1,16-dicarboxylic (dioic acid, CAS number 20701-68-2; INCI denomination current octadecendioic acid), lycochalcone A, ascorbic acid and its derivatives such as vitamin E and its derivatives, vitamin A and its derivatives, and-oryzanol, panthenol and / or niacinamide.

Another preferred active substance according to the invention is for example polidocanol.

The amount of active substances (one or more compounds) in the preparations is preferably 0.001 to from 30% by weight, in particular from 0.05 to 20% by weight, especially from 0.1 to 10% by weight, based on the total weight of the preparation

Finally the odorous matters may contain soapy products and other additives and auxiliary elements in an amount of up to 5% by weight. Auxiliary substances suitable are, for example, the binder means or plasticizers Among them is, for example, glycerin, a partial glyceride of fatty acids or fatty alcohols with 12-22 C atoms. Fatty alcohols can be use, for example, as a by-product of alkyl- (oligose) -glucoside if the alkyl-oligo-glycoside is used as matter premium with a content of up to 50% by weight of fatty alcohol free.

The manufacture of detergent tablets solids according to the invention can be carried out following the method usual for soaps. Initially a basic soap is manufactured to from a preparation of fatty acid and soda or hydroxide bleach sodium with a solid substance content of 25-50% by weight and concentrated to a 50-70% by weight of solid matter. To this soap Basic, for example, 60% can be added if desired or requires, free fatty acids, an anionic surfactant and a complex former Then the basic soap is dehydrated, by example, in a vacuum expansion dryer at 120 ° C to 130 ° C. In the expansion the soap cools spontaneously to some temperatures below 60 ° C. All this originates some tapes or soap macaroni with a solid matter content of 73-85% by weight.

The elaboration of this basic soap represents the process for obtaining pure soap.

This process is carried out in a mixer soap in which the alkyl- (oligose) -glucoside and the remaining additives auxiliary next to the soap strips. Here they mix with intensity in a propeller mixer with cylindrical sieve the paste alkyl- (oligo) -glucoside and, for example, the odorous matter, dyes, pigments and other additives and to then they are evacuated through an extrusion press and if if necessary, they are taken to a press for parts where They make the soap bars.

Parts or tablets of solid detergent in The meaning of the present invention can be presented in the form of macaroni, ribbons, granulated, extruded, flakes and in any Another way.

The soaps according to the invention are characterized by an exceptionally pleasant skin sensation during washing. The formation of cracks that often appears with usage has been clearly reduced. These properties represent for the consumer a clear improvement in daily hygiene.

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Examples Soaps manufacturing

The basic soap macaroni are dosed with the remaining components in a usual soap mixer (propeller mixer with perforated sieve), are homogenized mixing several times, they are evacuated through a press of extrusion, cut and handled in the usual way to create pills

Basic soaps

7

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Pills of soap

8

9

10

Claims (9)

1. Solid soap bar containing more than 0.2% of a thiosulfate salt, 50-90% salt of fatty acid, water in an amount of 5-35% by weight and additional anionic surfactants in a lower proportion than 10% 2. Soap bar according to claim 1, characterized in that the pH value of a 1% aqueous solution is greater than 8. 3. Soap bar according to one of the preceding claims, characterized in that the fatty acids are composed of 50-95% by weight of C16 -C18 fatty acids and 5-50% by weight of C 12 -C 14 fatty acids, preferably characterized in that the fatty acids are composed of 50-85% by weight of C 16 -C 18 fatty acids and 10- 50% by weight of C 12 -C 14 fatty acids. 4. Soap bar according to one of the preceding claims, characterized in that it also contains 1-10% by weight of free fatty acids with 12 to 22 atoms. 5. Soap bar according to one of the preceding claims, characterized in that it contains 1-99% by weight of fatty acids with 12-22 C atoms, in the form of its alkaline soap. 6. Soap bar according to one of the preceding claims, characterized in that the melting point is greater than 45 ° C. 7. Soap bar according to one of the preceding claims, characterized in that the thiosulfate salts or salts are chosen from the group of inorganic alkali metal thiosulfates, preferably sodium thiosulfate. 8. Soap bar according to one of the preceding claims, characterized in that it is stored in a box based on water insoluble fleece, a perforated net or sheet. 9. Use of thiosulfate salts for the reduction of the formation of cracks in soaps according to one of the previous claims.