SK3294A3 - Soap composition containing sodium diphosphate - Google Patents

Abstract

A detergent soap composition in bar form comprising (1) an alkali metal or ammonium soap of a saturated or unsaturated fatty acid or mixture thereof, (2) a moisture content in the range of 6-14% by weight of total water, and (3) from about 0.5 to about 15% by weight of a structurant selected from the group consisting of tetrasodium pyrophosphate, a hydrate of tetrasodium pyrophosphate (TSPP) and mixtures thereof. The structurant provides enhanced structural integrity, hardness, slough and wear- and crack-resistant characteristics to the bar. A method of preparing the detergent soap composition comprising mixing in a crutcher, the soap, water and TSPP at a temperature above 80 DEG C and subsequently removing excess moisture at a temperature above about 80 DEG C for a time sufficient to reduce the total water content of the mixture to from 6-14% by weight, followed by cooling and forming into a bar, is also disclosed.

Description

Field of the invention

The invention relates to a soap composition in bar form containing sodium pyrophosphate having improved structural integrity, hardness, resistance to the formation of a greasy and wear-resistant material, and resistance to cracking or cracking.

BACKGROUND OF THE INVENTION

The solubility of soaps in water is usually very high, especially if the soaps contain a high proportion of salts of unsaturated fatty acids (such as oleate and linolate). Soaps derived from a high coconut oil content have a very high wear resistance while having poor lubricating properties. These soaps show good foaming (good soap foam formation) and are resistant to cracking, but with bar soaps (or soap in bar form) the wear rate and the tendency to form a greasy material are important properties. In order to improve these properties of detergents in bar form, it has generally been proposed to use various textiles or fillers. These substances are used to improve the structural integrity as well as to improve the physical properties of the soap bars into which they are incorporated. In this regard, for example, it has been proposed to add electrolytes (such as sodium chloride) and various polymeric substances to the soap bars in order to improve the wear characteristics of these products in bar form due to the salting out of the liquid phase. However, the resulting soaps obtained had poor foaming (foaming) and an increased tendency to crack.

The prior art pyrophosphate form as a disintegrant (TSPP) was used according to the technique in detergent compositions in bar

This material has low solubility in water (7-8% at room temperature), high transition temperature (80 ° C) and absorbs water at 60% of its weight. In recrystallization, this tetrasodium pyrophosphate (TSPP) forms long needles and hexagonal platelets.

For example, U.S. Pat. No. 2,686,761 describes the addition of this tetrasodium pyrophosphate (TSPP) to soap compositions in bar form containing a high moisture content, i.e., a proportion greater than 20% by weight. The tetrasodium pyrophosphate TSPP is combined with a high moisture soap in a barrel blender, but the mixture must be thoroughly mixed, sheared and compacted to achieve salting out of the molten soap and water to form a bar product having the properties of a piled soap. It is waxy, translucent and the beta phase predominates.

The resultant bar product thus obtained has a high total water content, but at the cost of reduced soap content. In addition, the presence of residual moisture in this bar product leads to an increased tendency to crack. Those skilled in the art will recognize that the tetrasodium pyrophosphate TSPP functions in these bar soaps according to U.S. Pat. No. 2,686,761 as an inert filler, the presence of which makes it possible to obtain a mixture containing more water and less soap with deteriorated structural properties.

U.S. Pat. No. 4,308,158 discloses a synthetic surfactant comprising a filler comprising alkali metal orthophosphate, alkali metal pyrophosphate and alkali metal triphosphate.

U.S. Pat. No. 3,639,286 discloses the addition of an alkali metal trimetaphosphate to a synthetic detergent bar material or a bulk material to absorb a portion of the water in the material such that the final water content corresponds only to the crystallization water of the triphosphate salt.

U.S. Pat. No. 3,494,869 discloses a super-oily bar soap comprising an acidifying agent, which may be phosphoric acid or a strong salt thereof. This acidifying agent is present to react with the soap ingredients to form free fatty acids in situ.

U.S. Pat. No. 2,686,731 describes the addition of tetrasodium pyrophosphate TSPP to non-soap detergent products where it functions as a filler.

U.S. Pat. Nos. 2,970,116 and 3,274,119 refer to transparent, high-moisture bar soaps containing an electrolyte with a sodium triphosphate content for water salting.

U.S. Pat. No. 3,370 discloses strong, fast dissolving detergent containing hydratable condensed phosphate, for example, tetrasodium pyrophosphate TSPP.

015 with tablets such as

U.S. Pat. No. 4,297,230 relates to non-crystallising transparent bar soaps containing 4 to 20% potassium soap and an electrolyte which may contain tetrasodium pyrophosphate.

U.S. Pat. No. 3,344,076 discloses detergent tablets or briquettes containing at least 20% by weight of a phosphate component (such as tetrasodium pyrophosphate or pentasodium or pentapotassium triphosphate). These tablets are formulated to have a high disintegration rate and solubility in washing machines.

U.S. Pat. No. 3,798,181 discloses enzymatic bar detergents suitable for use in laundry washing machines, wherein these materials contain tetrasodium pyrophosphate as a filler.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a bar-type soap detergent having a low moisture content and increased structural integrity, hardness, resistance to grease and wear, and crack resistance.

These objectives are met by a bar-form detergent soap composition according to the present invention which comprises:

(1) an ammonium or alkali metal soap based on a saturated or unsaturated fatty acid or mixtures thereof, (2) not more than about 14% by weight of total water, and (3) from about 0.5 to about 15% by weight of the structured substance selected from the group consisting of tetrasodium pyrophosphate, tetrasodium pyrophosphate hydrate and mixtures thereof, which provides improved structural integrity, hardness, grease and wear resistance, and crack resistance.

The present invention also relates to a process for the preparation of the aforementioned detergent soap composition, which comprises mixing an ammonium or alkali metal soap or a mixture of these with a saturated or unsaturated fatty acid or mixtures thereof, water and at least a portion of pyrophosphate in a barrel blender. 80 DEG C. followed by vacuum drying to a final moisture content in the range of 6-14% while maintaining the soap temperature above 80 DEG.

SUMMARY OF THE INVENTION The present invention is based on the discovery that tetrasodium pyrophosphate (TSPP) uniquely promotes the enhancement of the structural integrity and physical properties of detergent bar soaps containing 6-14% moisture. In addition, this tetrasodium pyrophosphate TSPP also improves the processability of the soap compositions in which it is contained to form detergent bars or briquettes (lump form).

As mentioned in the discussion of prior art publications, it is known from these materials to add tetrasodium pyrophosphate to these

However, the use of this substance of the technique limited only to the content of fatty soap detergents in bar form, according to the prior art, was a soap having a very specific composition, an acid having a high moisture content, where it functions as a filler. In this sense, for example, U.S. Pat. No. 2,686,761 describes a process by which, as a result of adding this tetrasodium pyrophosphate to a soap composition under quite certain processing conditions, a bar soap containing a high proportion of water is prepared at the expense of a lower soap content. In addition, it should be noted that the beta phase is predominant in the bar soap thus obtained. It is well known in the art that in soap bars with a high moisture content (in the range of 20 to 40%) the wear rate increases with increasing percentage of the beta phase. In addition, it should be noted that the process described in U.S. Pat. No. 2,686,761 applies only to a particular group of fatty acid soaps (i.e. soaps with a fat content corresponding to an iodine number greater than 25, with a maximum of 40% of the combined fatty acids being saturated acids containing less than 16 carbon atoms and at least 20% of these the combined fatty acids are saturated acids having 16 to 22 carbon atoms). It should also be noted that these compositions containing soap component, water, and tetrasodium pyrophosphate TSPP should be subjected to extreme shear conditions of the loaded soap barrel blender, followed by agitation to achieve beta-phase predominant properties. In addition, it should be noted that the use of the aforementioned limited group of fatty acid soaps is a critical parameter for the formation of the beta phase in the final soap in bar form.

It will be appreciated by those skilled in the art that tetrasodium pyrophosphate TSPP functions in bar soap compositions of U.S. Pat. No. 2,686,761 clearly as a filler and as a extender, allowing the manufacture of bars with a high water content and a low soap component content that is in the beta base.

In bar soaps of the present invention, this tetrasodium pyrophosphate works in a completely different way. In particular, however, the present invention is applicable to all types of fatty soaps used in the manufacture of detergent bar soaps.

In addition, it is noted that this tetrasodium pyrophosphate TSPP functions not only as a filler that allows the preparation of bar soaps containing a high proportion of water, but rather as a functional reagent that allows the preparation of low water detergent bar soaps and further as an active ingredient. improves many physical properties of this bar form.

It should further be noted that this tetrasodium pyrophosphate TSPP functions as a processing agent in the manufacture of detergent bars.

Finally, according to the present invention, it is not necessary, as is the case in the process disclosed in U.S. Pat. No. 2,686,761, subjected to a blend comprising a soap component, water, and tetrasodium pyrophosphate after processing in a barrel stirrer to high shear to obtain the desired product.

Without intending to limit the scope of the present invention and the accuracy and accuracy of any theoretical justification set forth to explain the nature or functioning of the present invention, it is believed that the highly advantageous properties of the soap bar detergents of the present invention are achieved due to the unique mixing method of the individual the ingredients of this composition in a barrel blender and drying the resulting mixture thus obtained. In view of the foregoing, it is clear that a critical feature of the successful embodiment of the present invention is the addition of at least a portion and preferably a whole portion of said tetrasodium pyrophosphate to the soap mixture in a barrel blender. This mixture is then heated to a temperature above about 80 ° C, which is the transition temperature of the tetrasodium pyrophosphate hydrate, followed by drying under vacuum at the above temperature to a final moisture content in the range of 6 to 14%. A decisive aspect of a successful embodiment of the present invention is that the residual moisture is removed during drying of the tetrasodium pyrophosphate, i.e. 80 ° C.

It is also believed that tetrasodium pyrophosphate and the remaining tetrasodium pyrophosphate hydrate in the resulting bar product form long needle crystals and hexagonal platelet crystals throughout the bar soap structure, forming a system that appears as a fiber type matrix system. It is believed that this strengthening system formed by crystals of tetrasodium pyrophosphate and tetrasodium pyrophosphate TSPP provides improved structural integrity, hardness, resistance to the formation of a sticky material, and wear and cracking resistance in conjunction with the soap bar detergent of the present invention.

in the art, the principle is stated

In practicing the present invention, any fatty acids or mixtures of these fatty acids, whether saturated or unsaturated, can be used, which are usually used to prepare soap detergent bars. It will be apparent to those skilled in the art from the detailed disclosure of the present invention that the nature of the particular fatty acid or fatty acids used to prepare the composition comprising the soap component, tetrasodium pyrophosphate and water is not very important. Examples of suitable fatty acids from which the soaps (preferably sodium salts) are derived include fatty acids having C8-C22 alkyl chains, preferably C12-C18 alkyl chains.

In a preferred embodiment of the invention said fatty acids are those derived from mixtures of tallow and coconut oil in which the ratio of tallow soap to coconut soap is in the ratio of 1: 1 to 9: 1. Coconut-based soap is interchangeable with oil-based soap from palm kernels. The tallow-based soap is interchangeable with palm-based soap or other hardened soap derived from fatty acids containing 16 carbon atoms or more.

The tetrasodium pyrophosphate may be added to the soap component in the boiler, or may be added together with the component to feed the component to the barrel stirrer, or may be added to the barrel stirrer, followed by the addition of soap. In a preferred embodiment of the invention, most of the disodium pyrophosphate is added to the barrel blender together with the soap and the remainder is added to the amalgamator.

As mentioned above, in order to successfully apply the present invention, a mixture comprising a soap component, tetrasodium pyrophosphate and water to a temperature above the transition temperature of tetrasodium pyrophosphate hydrate needs to be heated and then dried to a final water content of 6 to 14% by weight above 80 ° C

Of course, adjuvants commonly used in the preparation of detergent bar soaps may be added to the compositions of the present invention. Examples of such adjuvants include chelating agents such as EDTA, DTPA, opacifiers such as titanium dioxide TiO ₂ , optically brighteners such as Tinopal, and fillers such as talc, kaolin, etc.

DETAILED DESCRIPTION OF THE INVENTION

The soap composition comprising tetrasodium pyrophosphate in bar form, the process for its preparation and the product properties will be explained in more detail below with the aid of examples of specific embodiments, which are not intended to limit the scope of the invention, but merely to illustrate it.

In the accompanying drawings, FIG. Figures 1 and 2 show a graphical comparison of the rate of moisture loss over time for bar soaps according to the present invention which contain tetrasodium pyrophosphate and control bar soaps not containing this pyrophosphate TSPP:

In FIG. 3 is a graphical representation of the varying water content in accordance with the tetrasodium pyrophosphate content of the bar soaps of the present invention containing the tetrasodium diphosphate.

Example

Batches containing the following components were prepared into a blender mixer and an amalgamator.

Composition of the blend into the blender (soap chips)

ingredients Materials. % pure soap ingredient (85% tallow ingredient) 15% coconut component tetrasodium pyrophosphate TSPP EDTA (Na h BHT (butylated hydroxytoluene) 96.95 0-3 0.02 0.02 100 Composition of the mixture into an amalgamator ingredients Materials. % soap chips - perfume 98.5 1.5

The pure soap ingredient (30% moisture) was melted in a kettle at 80 ° C. To this soap component was added anhydrous tetrasodium pyrophosphate at 80 ° C and the mixture was stirred for 30 minutes. The soap chips were prepared by drying the mixture under vacuum to a moisture content of 6 to 14% at 90 to 110 ° C.

The soap chips were mixed with perfume and dye, the mass was crushed three times in a roller mill and processed in a peloteus (a machine for piling soap into bars). The bars were then pressed into a brick shape.

A total of 7 batches were prepared using a tallow component and a coconut component in a 85/15 ratio (see Table 1). Batches 1 and 2 were prepared without the use of tetrasodium pyrophosphate and using 3% tetrasodium pyrophosphate TSPP. The final moisture content of these bars was maintained at about 8%, with disodium TSPP added to the barrel stirrer. Batches 3-5 were prepared with a moisture content of 9-10% in a bar soap, in which case the addition of 4-disodium TSPP was not used in the first case and 3% of 4-disodium TSPP added to the barrel stirrer. For batch 5, a further addition of 1.5% of tetrasodium pyrophosphate TSPP to the amalgamator was used. Batches 6 and 7 were prepared without the addition of tetrasodium pyrophosphate and with the addition of tetrasodium pyrophosphate in an amount of 3%, the pyrophosphate pyrophosphate was added to the amalgamator.

For these different mixtures, different (moisture, hardness, lubricant formation, velocity) rates were measured under similar controlled conditions (see Table 1). The rate of moisture loss was the characteristics of the bar soap cracks, dry stains, wear formation and moisture loss measured by bar weighting. material at regular intervals (see Figures 1 and 2).

The following terms and their definitions were used to evaluate product quality:

Volatiles - These volatiles represent a percentage of weight loss. This weight loss corresponds to the weight content of water plus fragrances and other volatiles during heating using a vacuum oven (82 ° C, 8.45 kPa pressure).

Hardness - The bar product hardness was determined using a needle penetrometer (puncture test). This device uses a weighed needle tip, and the depth of penetration into the soap surface was measured at 10-second intervals. At least ten measurements have been made to measure this parameter, with an average value in millimeters. The results represent a relative estimate of the hardness of the bar product.

Product soaked after soaking - The soap bars were suspended in normal tap water at room temperature (approximately 24 ° C) for 4 hours and then allowed to dry for 24 hours before evaluation. All cracks formed on the surface of the bar product were numerically evaluated using a scale from zero (no crack) to five (crack strength) and then the result was summarized. For example, a bar soap that had 5 cracks of 1 plus 2 cracks of 4 had a total score of 13.

Dry stains - The granularity of the bar products was determined by washing the rods with water at temperatures ranging from 12.8 ° C to 29.4 ° C. These bar products were observed and evaluated every 8.3 C. C. A score of 0-25 is acceptable, with higher and unacceptable spots marked 50, 75 and 100.

Lubricant formation (low humidity, room temperature) - The original bar soap weight was recorded with this measurement. These bars were placed in plastic soap dishes (120 millimeters x 75 millimeters x 16 millimeters) filled with tap water at room temperature. This soap remained in the water for 17 hours. The soft soap was then removed by hand and the bars were dried at room temperature for 24 hours and then weighed. Test results were reported as weight loss per 100 grams.

Lubricant Formation (High Humidity) - The weight of the bar product was recorded in grams. These bars were then washed twice at 30 minute intervals for 10 seconds at 37.8 ° C prior to testing. The bar soap was then placed in a soap dish (120 millimeters x 75 millimeters x 16 millimeters). The bowl was filled with tap water and the soap bar remained in the water for 17 hours at a temperature in the range of 35-40 ° C at 100% relative humidity. At the end of this

After 17 hours, the resulting soft material (greasy) was removed by finger pressure. The bar product was then air dried for 24 hours at a temperature in the range of 21-25 ° C, after which the bar product was weighed and the weight recorded. The weight loss was expressed as a loss per 100 grams.

Wear during repeated hand washing - With this second soap repeatedly washed was performed during the simulation of the use of this test method were rod and allowed to dry. This four-day interval test for household product. The initial weight of this bar soap was recorded. Several different persons rinsed the bar products for 10 seconds with tap water (with a temperature in the range of 32.2 - 37.8 ° C). The soap bar was then placed in a soap dish with a grid to drain the soap. The bar soap was allowed to dry for at least 30 minutes before washing again. These bar soaps were washed for a total of twenty times for 10 seconds and were then dried for 24 hours before weighing again. The results are reported as both weight loss per 100 grams and weight loss in use.

The results obtained are shown in the following Table. First

Table no. 1

Properties of tallow and coconut bar soaps based on 85/15 ratio containing tetrasodium pyrophosphate as filler

batch no. Moisture, vacuum oven, performed overnight at high temperature hardness, needle penetro- meter cracks, 4 hours soaking, 24 hours drying 1 base 85/15 control 8.04% 3.84 mm 19:50 considerably according to appearance 2 base 85/15 3% TSPP v crutcher mIXER 7.49% 2 .. 7 6 mm 10:00 mild to moderate in appearance 3 base 85/15 control 9.74% 4.54 mm 19:00 slightly according to appearance 4 base 85/15 3% TSPP v crutcher mIXER 8.72% 3.49 mm 13:00 Weak according to appearance 5 base 85/15 3% TSPP v crutcher mIXER 1.5% TSPP in amalgamator 10.06% 3.61 mm 7:00 mild to moderate in appearance 6 base 85/15 control 6.33% 3.23 mm 2:00 good look 7 base 85/15 3% TSPP in the amalgamator 7.15% 3.46 mm 00:00 perfect look

Table no. 1 (continued)

Dry spots (appearance)

Lubricant formation, temperature

Grease formation, high

batch washed rooms, relative humidity no. product 17 soaking hours, bone, twice 24 hours drying preliminary for- Washing, 17 hours maceration 24 hours drying 1 26.6 'C diameter 25 14.07% 20.68 % 21.1 "C. grained 25 12.8 'C grid 25 2 26.6 'C line 11.55% 18:17 % 21.1 'C. line 25 12.8 • c. grained 25 3 26.6 'C diameter 25 16.50% 24.47 % 21.1 C grid 25 12.8 'C rough 50 4 26.6 'C line 11.65% 19.95 % 21.1 'C fine grained 25 12.8 'C grid 25 5 26.6 'C grained 25 10.72% 17:46 % 21.1 'C grid 25 12.8 'C grid 25 6 10.99% 21:15 % 7 26.6 'C diameter 25, 9.49% 4.20 % grainy 21.1 'C somewhere grid 25 12.8 'C grid 50

Table no. 1 (continued)

batch no. Wear rate 10 seconds wash, 20 uses, 24 hours drying Wear rate, loss in use 1 24.05% 1.20 grams 2 16.17% 0.81 grams 3 22.65% 1.13 grams 4 17.77% 0.89 grams 5 17.07% 0.85 grams 6 22.44% 1.12 grams 7 22.86% 1.14 grams

Note: values are averaged

The benefit of the use of tetrasodium pyrophosphate TSPP was only observed when it was added to the pure soap ingredient, and the residual moisture content was subsequently removed under vacuum while maintaining the temperature above 80 ° C. Otherwise, the addition of tetrasodium TSPP to pre-dried soap in the form of psoriasis in an amalgamator may reduce the total soap content, but does not improve the necessary bar product properties such as hardness, lubricity and in-use properties. In the above table no. 1, batch 7 corresponds to a bar product prepared using tetrasodium pyrophosphate TSPP added to the amalgamator. When comparing these values to the control values (batch 6), it is clear that the tetrasodium pyrophosphate TSPP added to the amalgamator has a decisive influence on the overall product characteristics. The key benefit of the tetrasodium pyrophosphate TSPP added to the barrel stirrer is summarized in the following Table. Second

Table no. 2

Improved bar product characteristics for bar soap containing tetrasodium pyrophosphate TSPP

Addition of tetrasodium pyrophosphate TSPP amalgamator compared to control a barrel stirrer compared to a control sample - hardness - + - cracks + + - dry spots - = the formation of a greasy matter (low humidity) = ++ the formation of a greasy matter (high humidity) = ++ - wear = ++ - loss of moisture + ++

= means no significant difference ± means a significant difference

Regarding the formation of a lubricating mass in a bar product containing tetrasodium pyrophosphate, it may be noted that the properties of the product of the invention were superior compared to a bar product which did not contain tetrasodium pyrophosphate (both under high and low humidity test conditions) ). The hardness of the bar product was improved with the addition of tetrasodium pyrophosphate TSPP, and the rod product containing tetrasodium pyrophosphate TSPP was improved in terms of crack resistance. The wear rate decreased with the tetrasodium pyrophosphate bar and the loss of moisture was lower with the tetrasodium pyrophosphate bar with TSPP compared to the control.

Imaging of the water content of a bar soap containing tetrasodium pyrophosphate TSPP

As is well known, tetrasodium pyrophosphate forms water hydrate and absorbs water up to 60% by weight. The water content of the bar soap was monitored by the differential scanning calorimetric method (DSC). The total water content was determined by drying the sample in a vacuum oven at 82.2 ° C for 24 hours, and the free water was calculated from the endothermic transition of melting ice in soap samples by DSC. The difference between the total moisture content and the free water represents the total amount of bound water in the soap bar. The proportion of water in the soap was then calculated from the total bound water and the TSPP-water content of the soap product (see Table 3).

Table no. 3

Determination of the water content of the soap (70% tallow / 30% coconut) containing tetrasodium pyrophosphate TSPP

free total total TSPP Water v TSPP Water Water bound Water - Water soap (%) (%) (%) (%) (%) (%) 0 17.6 28.6 11.0 0 11.0 4.8 12.6 26.1 13.5 2.9 10.6 9.1 11.5 23.0 11.5 5.5 6.0 13.0 3.7 19.3 15.9 7.8 8.1 15.7 3.9 20.9 17.0 9.4 7.6 23.0 - 20.4 20.4 13.8 6.6 28.6 - 19.4 19.4 17.2 - 33.3 - 17.8 17.8 20.0 -

According to the invention, it was observed that the total bound water content, the water content of the tetrasodium pyrophosphate TSPP hydrate and the free water content in the bar soap varies linearly with the tetrasodium pyrophosphate concentration of TSPP and corresponds to 10 moles of water absorbed with 1 mol of anhydrous pyrophosphate. ).

Phosphorus distribution in the rod product

The flat (split) parts of the soap bar were simply characterized in terms of both the qualitative appearance and the distribution of the components (dot diagram or elemental imaging) ascertained by X-ray analysis with energy scattering (EDX method). For these tests, the following comparative samples were prepared with a tallow and coconut soap raw material containing 0-25% synthetic surfactant selected from anionic surfactants (coconut monoglyceride sulfate, sodium cocoyl isethionate, alkyl glyceryl sulfonate) for analysis by EDX:

21st

- sample # 1 - tetrasodium pyrophosphate amalgamator TSPP (4%) added to - sample # 2 tetrasodium pyrophosphate TSPP (0 %). - sample # 3 - tetrasodium pyrophosphate barrel stirrer, TSPP (3%) added to - sample # 4 - tetrasodium pyrophosphate barrel stirrer. TSPP (4%) added to

For sample # 2, phosphorus was not detected in any significant amount. For the observed portion of Sample # 1, a dot plot indicated that the phosphorus was unevenly concentrated, with Sample # 3 and Sample # 4 showing phosphorus distribution uniformly in small clusters.

Four samples based on the tallow component and the coconut component (85% / 15%) were also analyzed for phosphorus distribution on the surface of the bar soap before and after wear (20 washes) by the EDX method to determine the wear effect on the addition of tetrasodium TSPP:

(D (2) (3) (4) sample # sample # sample # sample #

- 3% pyrophosphate of a four-barrel blender,

- wear testing,

- 3% disodium pyrophosphate amalgamator,

- wear testing.

TSPP added to

TSPP added to

For bar soaps (Sample # 1) prepared by adding 4-Sodium TSPP to a barrel stirrer and drying at high temperature, an even phosphorus distribution was noted compared to Bar Soaps (Sample # 2) prepared by adding 4-Sodium TSPP Diphosphate to the amalgamator. . After testing both wear samples, the phosphorus concentration of Sample # 2 was significantly lower compared to Sample # 1. These results suggest formation of a fibrous system within the bar soap when four-sodium pyrophosphate TSPP was added to the barrel mixer and high temperature drying.

When four-sodium TSPP is added to the barrel stirrer followed by high-temperature soap crumb drying, soap bars are prepared with the four-sodium TSPP pyrophosphate evenly distributed throughout the bar product. The reduction in sticky formation and wear in these bar products is related to modifying the surface properties of these bar products due to the addition of tetrasodium pyrophosphate TSPP.

Bar products treated with 2-4% tetrasodium pyrophosphate TSPP had improved goat formation properties, reduced wear rate and were less prone to crack formation compared to rods not containing tetrasodium pyrophosphate TSPP. These results were also achieved due to the presence of tetrasodium pyrophosphate TSPP as a structural agent in these bar products.

Solid phases in soap bars

Bar soaps prepared without and containing 4-disodium TSPP were analyzed for content of different phases by the X-ray diffraction method. TSPP-free diphosphate bar soaps were predominantly omega-phase, with beta-phase content ranging from 9 to 14%. However, the beta-phase content of TSPP diphosphate bar soaps could not be determined because this diffraction pattern of the TSPP diphosphate blocked the area in which the beta-phase is usually observed. For this reason, it was not possible to quantitatively specify the beta - phase content of bar soaps containing tetrasodium pyrophosphate.

Accordingly, the present invention provides a detergent bar soap containing tetrasodium pyrophosphate, which, due to the specific method of incorporating this component into the bar product, acts as a functional reagent and structuring agent instead of a clear filler, allowing the preparation of bar products with high water content and low soap content. .

Claims (5)

PATENT CLAIMS A detergent soap composition in bar form, comprising: an ammonium or alkali metal soap based on a saturated or unsaturated fatty acid or mixtures thereof, having a moisture content ranging from about 6% to about 14% by weight, and from about 0.5% to about 15% by weight of a structure selected from the group comprising tetrasodium pyrophosphate, tetrasodium pyrophosphate hydrate, and mixtures thereof, which provide improved structural integrity, hardness, grease and wear resistance, and crack resistance. 2. A detergent soap composition according to claim 1, wherein the soap comprises a soap component based on a saturated fatty acid containing 8 to 20 carbon atoms or mixtures thereof. The detergent soap composition of claim 1, wherein the soap comprises a soap component derived from a mixture of tallow and coconut fatty acids, wherein the ratio of the tallow soap component and the coconut soap component ranges from about 1: 1 to about 9 : first 4. A process for the preparation of a detergent soap composition according to claim 1, wherein ammonium soap or alkali metal soap or a mixture of said saturated or unsaturated fatty acid or a mixture thereof, water and at least a portion of quaternary pyrophosphate at a temperature above about 80 ° C, followed by removal of residual moisture from as follows 25 of the resulting mixture using vacuum while maintaining a temperature above about 80 ° C to a final moisture content in the range of about 6 to about 14%. A process according to claim 4, characterized in that all the proportion of said disodium pyrophosphate is added to the barrel stirrer.