SE439017B - DETERGENT BAR WITH IMPROVED FOAM AND NUTS SPEED FEATURES - Google Patents

Description

78Û3557 = 3 2 sodium chloride to improve the hardness of acyl isethionate rods.

Regardless of improvements in the fungal properties obtained from detergents according to these patents, the abrasion rate of these rods has still been a problem, and attempts to improve this property have hitherto been at the expense of foaming.

The use of alkoxyhydrogen moiety forms in soap bars has been described in U.S. Pat. No. 2,987,484, according to which sodium and potassium alkyl glyceryl ether sulfonates have been incorporated into soap bars as anionic surfactants in amounts of 35% or more. U.S. Pat. No. 2,988,511 discloses alkyl glycaryl ether sulfonates as predominantly anionic detergent active agents which can be used in combination with the isethionates. However, the foaming enhancing properties of alkyl glyceryl ether sulfonate compounds when used in relatively small amounts with acyl isethionates as the main surfactant are not previously known.

It has been found according to the invention that the incorporation of a relatively small proportion of sodium alkoxyhydroxypropanesulfonate and a small amount of sodium chloride into a substantially acyl isethionate-containing detergent rod with an unesterified water-soluble alkali metal salt of isethionic acid as a rod-making aid is substantially non-perishable. foaming properties and manufacturing properties. The term "predominantly" when used in connection with the proportion of ethyl isethionate means that the proportion of acyl isethionate is not exceeded by any other surfactant in the composition.

The present invention is particularly advantageous in that a more economically advantageous aeylisethionate detergent rod with less than the usual amount of üEü.ethionate salt can be manufactured and marketed, while the rod at the same time retains the very good foaming properties.

The present invention is applicable to toilet detergent rods of the type disclosed in U.S. Patent Nos. 2,894,912 and 3,376,229, and that which is set forth in these patents is intended to form part of the present specification. The predominant or major surfactant in the detergent bar of the invention is aliphatic higher fatty acid esters of alkali metal isethionic acid salt, hereinafter referred to as agyl isethionates.

The acyl isethionate constitutes from about 30 to 70% ~ of the bar and can be defined by the following general formula: RCOOCH 2 CH 2 SO 3 M (A) 7803557-3 in which R represents aliphatic group or mixed aliphatic group of higher fatty acid, or mixtures thereof having from 6 to 18 carbon atoms and having an iodine value of less than about 20, wherein M represents alkali metal cathyl, for example of sodium, potassium or ammonium, or the cation of an organic amine base, for example triethanolamine, triisopropanolamine, diethanolamine and monoethanolamine. The detergent bar composition may also contain from 2 to 10% of at least one water-soluble foaming enhancing or foaming stabilizing detergent salt selected from the group consisting of alkali metal and organic amines, higher aliphatic fatty alcohol sulfates, an alkylaryl sulfonate and a higher aliphatic alpha-fatty acid aliphatic. water, from about 2.5% to 25% water-soluble higher fatty acid well and from 10 to 40% of at least one higher fatty acid having from about 12 to about 25 carbon atoms such as binders and plasticizers, the detergent rod having a pH value in the range from 6 to 8, measured as 10% aqueous solution of the bar composition at 35 ° C.

In addition, the aforementioned detergent rod contains an esterified water-soluble alkali metal salt of isethionic acid, for example sodium isethionate, in the detergent rod as rod hardening and rod manufacturing facilitating additives in an amount of from about 1 to about 7%.

Detergent rods according to the above composition present various problems of use in that the wear rate is significantly higher than with other known marketed soaps and detergent rods.

This wear rate, which is a measure of the weight loss from the bar in use, depends largely on the chemical properties of the bar. It has been found that by decreasing the content of acyl isethionate / sodium isethionate in the detergent column with a corresponding increase in the amount of binder and / or plasticizer, a decrease in the wear rate can generally be achieved. However, when this is achieved, another property of the rod deteriorates, in particular the foaming properties of the rod. In addition, with the addition of defoamers or foaming additives to compensate for this deterioration of foaming, it has been found that when unchanged defoaming effect is achieved, the defoamers have caused manufacturing problems in the manufacture of the rod.

According to the present invention, it has been found that good foaming properties can be achieved with acyl isethionate detergent rods of the type described above without disadvantageous problems in manufacture or preparation by the addition of an alkoxy-hydroxy-7SÛÉSS7 = É 4 Prooansulfonate of the following general formula: CH3: CH3 IFCH 2 -β-CH 2 -CHOH-CH 2 -SO 3 -M in which n is an integer from 6 to 18, M may be calcium, magnesium, ammonium, sodium or potassium.

Very good foaming properties can be obtained, for example, if sodium alkoxyhydroxypropane sulfonate is added as a foaming enhancer to the acyl isethionate detergent bar composition. In addition to the very good foaming properties that can be obtained, it was found that incorporation of from about 2 to 10% of the alkoxy compound.

While the foaming and manufacturing properties of the acyl isethionate detergent rod are improved by the addition of the alkoxyhydroxypropanesulfonate, it has been found that the abrasion rate of the rod still remains relatively high. According to the invention, however, it has been found that the wear rate of the acyl isethionate rod improved as above can be significantly reduced by adding to the detergent rod, in addition to alkoxyhydroxypropanesulfonate, sodium chloride in an amount of less than 1.2%. Normally, a decrease in abrasion rate is accompanied by a decrease in foaming ability. The combination of sodium alkoxyhydroxypropanesulfonate and sodium chloride significantly reduces the wear rate, but the foaming properties of the improved acyl isethionate rods were surprisingly as good as or slightly superior to the properties of a detergent rod, for example of the type described in U.S. Pat. Thus, the combination of alkoxyhydroxypropanesulfonate / sodium chloride at the levels given below will enable the manufacture of acyl isethionate detergent rods with better economy and with improved wear rate while maintaining these very good foaming properties obtained with the alkoxyhydrocarbon alkoxy sulfone.

Thus, the present invention relates to a process for reducing the abrasion rate of an acyl isethionate detergent bar containing unesterified water-soluble alkali metal isethionate as a bar manufacturing aid, without adversely affecting the foaming properties or manufacturing properties of the bar, by introducing into preferably 2 to 6%, by weight, of an alkoxyhydroxypropanesulfonate of formula LH '}' 8Û3557 * ~ 3 CH3 '(CH2) n "CH2" O "CH2" CHOH ~ CH2 in which n is an integer from 6 to 18 and M is sodium, potassium, calcium or ammonium, and (b) less than 1.2%, preferably 0.1 to 1.0% and especially 0.6 to 1.0% sodium chloride, wherein the percentage is based on the total weight of the manufactured detergent rod.

The acyl isethionate detergent rod made by the process described above can be prepared by the conventional methods well known to those skilled in the art of toilet and detergent rods, and usually comprises from about 30 to 70 Y of an acyl isethionate of the general formula RCOOCH 2 CH 2 SO 3 M is an aliphatic group or mixed aliphatic group of higher fatty acid, or mixtures thereof having from 6 to 18 carbon atoms and having an iodine value of less than about 20, M representing alkali metal cation, for example sodium, potassium or ammonium cation, or cation of an organic amine base, for example triethanolamine, tri-isopropanolamine, diethanolamine and monoethanolamine, and from about 1 to about 7% bar manufacturing aids. unesterified water-soluble alkali metal isethionate such as the acyl isethionate detergent bar prepared by the process of the invention may also contain from 2 to 10% of at least one water-soluble foam-enhancing detergent salt selected from the group consisting of alkali metal and organic amine from about 1 to 9% water, from about 2.5 to about 25% water-soluble higher fatty acid well OCh from 10 to 40% carbon atoms such as binders and plasticizers, the finished detergent bar having a value in the range from 6 to 8, measured by at least one higher fatty acid with from about 12 to 25 as 10% aqueous solution of the bar composition at 35 ° C.

The present invention thus relates to a detergent rod comprising (a) 1% by weight, of an alkoxyhydroxypropanesulfonate of the formula CH 3 - (cnz) n-cnz-O-c fl 2 -c count: in which n is an integer from 6 to 18 and M is sodium, potassium, calcium, magnesium or ammonium, (b) less than 1,2%, preferably 0,1 to 1,0%, and in particular 0.6 to 1.0% (c) about 30% to about 70%, by weight of sodium chloride, aeyl isethionate of the formula RCOOCH2CH2SO3M 78 @ 3557 == 3 in which R is an aliphatic group or mixed aliphatic groups of higher fatty acid, or mixtures thereof, having from 6 to 18 carbon atoms and having an iodine value of less than about 20, wherein M represents alkali metal cation, for example of sodium, potassium or ammonium, or cation of an organic amine base, for example triethanolamine, triisopropanolamine, diethanolamine and monoethanolamine, and (d) about 1% to about 7% of an unesterified water-soluble alkali metal isethionate, for example n atrial isethionate, as a bar manufacturing aid.

The invention relates in particular to a detergent rod comprising the following components calculated in parts by weight: Parts of the rod weight a. Acyl isethionate 35 ~ 55 b. Higher fatty acid 20 ~ 27 c. Higher fatty acid soap 5 - 15 d. Sodium alkylbenzenesulfonate 2 - 4 e. Sodium isethionate 1 - 4 f. sodium chloride 0.1 - 1.0 g. alkoxyhydroxypropanesulfonate 1 - 10 h. water 3 - 6 wherein the higher fatty acid is selected from the group consisting of palmitic acid and stearic acid, the higher fatty acid soap consists of sodium salt of an aliphatic monocarboxylic acid, from about 8 to about 18 carbon atoms, of which about 18-22% contain 8 to 14 carbon atoms, the alkyl group in alkylbenzene sulfonate derived from a straight chain hydrocarbon mixture having an average of about 13 carbon atoms, and the sum of (a) to (h) is in the range of about 96 to about 100 parts by weight.

According to a preferred embodiment, toilet bars according to the invention comprise the following components in the stated proportions: Weight parts of the bar a. Sodium acyl isethionate 38 - 46 b. Higher fatty acid 21 - 25 c. Higher fatty acid soap 8 - 13 d. Sodium alkylbenzenesulfonate 1 - e. Sodium isethionate 1 - f. sodium chloride 0.5 - 1.0 g. sodium alkoxyhydroxypropanesulfonate 2 - 3 - 6 h. water 27803557--3 wherein the acyl part of the isethionate is derived from coconut oil, the higher fatty acid is selected from the group comprising palmitic acid and stearic acid, the soap consists of sodium salt of an aliphatic mono-nucleic acid of from about 8 to 18 carbon atoms, of which about 8-22% comprise 8 to 14 carbon atoms, the alkyl portion of alkyl benzene sulfonate is derived from a straight chain hydrocarbon mixture having an average of about 13 carbon atoms, and the sum of (a) to (h) is in the range of about 96 to about 100 parts by weight, an optional residue comprising minor additives, for example both TiO 2, dyes and various constituents which are combined with d the above components.

Particularly advantageous bars according to the invention have the following composition: Parts by weight of the bar sodium acyl isethionate (a) 40 - 42 stearic acid 20 - 23 coconut oil fatty acids 2 - 3 soap of mixed tallow and coconut oil (b) 9.5 - 10.5 sodium stearate 2.5 ~ 3, Sodium isethionate 1 - sodium alkylbenzenesulfonate (c) 1.5 ~ 2.5 sodium chloride 0.6 ~ 1, sodium alkoxyhydricxypropansulionate (d) 4 - TiO2 0.1 ~ 0.3 bactericides 0 - 1.5 mineral oil 0 ~ 1.5 perfume 0 , 7 - 1,7 dyes 0,001 ~ 0,003 miscellaneous (e) 1,5 - 3 water 4 «6 (a) the alkyl group is derived from coconut oil, (b) about 75 - 85 parts of tallow and about 15 ~ 25 parts of coconut oil, (c the alkyl group consists of a straight chain group of about 11 to 15 carbon atoms, (d) the alkyl group consists of a straight chain group of about 8 to 20 carbon atoms, (e) inert material which is inevitably added in combination with the components wherein the acyl part of the sodium acylationate is derived from coconut oil, and the alkyl portion of the sodium alkylbenzene sulfonate 78 ~ ÛÉ557 = 3 _ s is derived from a straight chain hydrocarbon mixture having about 11 to 15 carbon atoms.

The acyl isethionate component of the detergent bar can be prepared by methods well known in the art. Suitable formulation methods are found in U.S. Patent Nos. 3,320,292; 3,376,229; 3,151,136; 3,383,396; 3,420,857 and 3,420,858.

The term "soap" is used in this context in the popular sense, i.e. alkali metal salts of aliphatic alkane or alkene monocarboxylic acids. In general, the sodium soaps can be used in the bars according to the invention, but from about 1 to about 25% of the soap may consist of potassium soaps. The soaps used in the invention are the well known alkali metal salts of natural or synthetic fatty acids (alkane or alkene acids) having about 12 to 20 carbon atoms, preferably about 12 to about 18 carbon atoms, and may be described as alkali metal carboxylates of acyclic hydrocarbons having about 12 to 20 carbon atoms. carbon atoms.

Soaps with fatty acid distribution in coconut oil may constitute the lower end of the wide molecular weight range, while soaps with fatty acid distribution in the corresponding peanut or rapeseed oil, or hydrogenated derivatives thereof, may constitute the higher end of the wide molecular weight range.

It is advisable to use soaps with the fatty acid distribution of coconut oil or tallow or mixtures thereof as these are the more readily available fats. The proportion of fatty acids with at least 12 carbon atoms in coconut oil soap is about 84%. This proportion is greater if a mixture of coconut oil and such fats as tallow, palm oil or non-tropical nut oils or fats is used, the main chain length being C16 and higher. The preferred soap for use in the acyl isethionate detergent bar has at least 84% fatty acids having about 12 to 18 carbon atoms.

The coconut oil used for the soap and also the one used for the isethionate can be replaced in whole or in part by other "high lauric acid" oils, ie oils or fats in which at least 50% of the total amount of fatty acids consists of lauric or myristic acids or mixtures of These oils can generally be exemplified by tropical coconut oil tropical nut oils, for example palm kernel oil, babassu oil, ouricurio oil, taucum oil, cochineal oil, murumuru oil, jaboty kernel oil, khakan kernel oil, dicane nut oil, and for vegetable use according to the invention. myristic acid esters. n A preferred soap is a mixture of about 15 to about 20 s 78Û3557 ~ 5 9, - coconut oil and about 80 to about 85, tallow. These mixtures contain about 95 - 96 fatty acids with from about 12 to about 18 carbon atoms.

The soap can be made from coconut oil, the fatty acid content being about 84% O.'b with Cl2 ~ Cl8 chain length.

The soaps may contain unsaturation in accordance with a commercially acceptable standard; Excessive unsaturation is normally avoided.

Sodium alkoxyhydroxypropane sulfonate can be prepared in the manner set forth in U.S. Patent No. 2,989,547.

The higher fatty acid component stated in the composition above is preferably a commercial mixture of about 455 The rate at which a toilet detergent rod is abraded by about stearic acid and about palmitic acid. in use, quantitative deviation is determined by measuring the rate at which the tablet is worn during a standardized washing procedure, hereinafter referred to as "abrasion rate test", the weight of the part of the bar consumed per use being determined. The results obtained in this test may vary somewhat from tester to tester and may vary from day to day, with the results obtained with tablets tested as a group of the same tester being compared with good results. control rods together with the rods according to each example.

Abrasion speed test Equipment. a. Smooth flat-bottomed soap cups made of plastic, b. Barbed rack or other point-shaped base for drying the rods, C, Liquid container marked 1.9 l.

Procedure.

The test begins on the morning of day 1 and ends on the morning of day 3. The initial weight of the rod is determined to be 0.01 g. 1.8 l of water ~ tap water at 40 ° C is poured into a porcelain water trough.

The hands and the bar are in the 40-degree water, the bar and the hands are removed, and the bar is rotated 20 times between the hands 1ßo ° c). lowering the bar and hands (a rotation The same procedure is repeated by immersing in the water, removing the bar and hands and the washing described above (20 rotations) which is repeated. The bar and hands are immersed again in the water, the bar is removed from the hands and placed in Lvätthon The washing described above is repeated 4 times during day 1 and again during day 2.

Tap water at 27 ° C is added to the soap dish before the bar is placed in the soap cup after the first and last wash on day 1 and day 2 (6.5 ml tap water for normal size, 2.5 ml tap water for bath size).

On the morning of day 3, the bar is washed as before, rinsed in the washing water and placed on the potting bed for drying. The bar is dried for at least 4 hours and weighed at 0.01 g.

Calculation.

The weight in grams used per wash is calculated as follows: Starting weight in grams - final weight in grams = grams per use number of washes Panel foam test. 20 test panelists, each with a control rod and an experimental rod, wash each rod under the following group of water hardness and temperature conditions in separate washbasins: a. 90-100 ppm hardness such as CaCO 3 at 24 ° C, b. 180 ppm hardness such as CaCO 3 at 24 ° C, and c. 180 ppm hardness such as CaCO 3 at 40 ° C.

Each sample panelist washes his hands in the usual manner for the person under the conditions set forth above and indicates a preference for either the control rod or the experimental detergent toilet rod based on the foam volume at each test condition. The test panel participant can also evaluate the rods equally if they show equally good assessed foaming properties. The higher the preference for a product, the higher the number.

The invention is described in more detail with the following exemplary embodiments which are intended to illustrate the invention without limiting it.

Example (a).

This example describes the preparation of sodium acyl isethionate detergent active ingredient. 200 kg of sodium acyl isethionate with 75 000 active detergent material are prepared as follows: 100 kg of coconut fatty acids and 310 kg of fatty acids recovered in the removal step of a previously prepared batch of fatty acid isethionate are combined in a shell-filled tank. A slurry containing about 75% sodium isethionate on a 100% pure base is loaded into a storage tank. Finally, 3 kg of zinc oxide is prepared as an aqueous., _._..__.___._._.____ .. _. ...___.____.... _ .. ._ ___- ll ve fi zßsv-3 slurry in another tank All the above-mentioned constituents are sent to a reactor and heated to a temperature of about 232 ° C by circulating the contents of the reactor. through a heat exchanger via a pump.

When the temperature of the reaction mixture reaches about 190 DEG-100 DEG C., water which develops during the reaction, together with water-vapor-distilled fatty acids, begins to distill from the reactor. These vapors are then condensed in a condenser. The fatty acids and water condensate are collected in a separator in which the fatty acids are decanted through a pipe and accumulated in a collection tank.

The reaction is substantially complete within about 150 minutes at 232 ~ 237 ° C when both fatty acids and water stop accumulating in the separator. at this stage the reaction mixture is drained in a stripping device which is also purged with nitrogen to maintain an oxygen @ fi_ atmosphere. By circulating a heat transfer liquid through the jacket of the stripper, the temperature of the reaction mixture is kept between about 220 and 235 ° C.

A vacuum is applied with ejectors to create a vacuum of about 50 mm of mercury. After maintaining this vacuum for a period of about 15 minutes, 360 kg of molten stearic acid is loaded into the stripper to maintain the fluidity of the reaction product therein after the removal of the original proportion of unreacted fatty acids. The removal of the unreacted fatty acids from the charged starting material is completed by further increasing the vacuum to about 69 cm of mercury and maintaining this level while maintaining the mass in the stripper at 232 DEG C. for a period of about 45 minutes. At this stage, the pressure is restored to atmospheric pressure by decoupling the vacuum ejectors and introducing nitrogen into the stripping device. The fatty acids collected during the stripping are returned to the fatty acid loading tank for re-use in subsequent reactions.

After analysis of the finished batch of acyl isethionate, the reaction product, which has a weight of 2160 kg, is released and rapidly cooled. The analysis showed that the acyl isethionate content was about 75.0 corresponding to a yield of about 92 t based on the isethionate charged in the reactor. 790š557 = ~ 3 U Example l.

This example describes the preparation of a detergent bar containing acyl isethionate according to Example 1a.

A Day mixer is charged with appropriate amounts of stearic acid / palmitic acid (45:55 weight ratio - Emersol 132), soap, sodium stearate, sodium alkyl (Cl3 average) benzenesulfonate and sodium chloride, followed by the quenched acylisation axon according to Example 1a. a composition having the composition in weight percent given below in Table A. The ingredients are mixed at 107 ° C for about 60 minutes. The composition is discharged into a cooled rotating drum and processed into chips. The chips are then loaded into a chip mixer to which perfume and TiO2 are mixed and milled into a rod shape.

Table A Example no. La lb lc Box code no. NS4207 NS4208 NS4209 (control) Composition wt% wt% wt% Acyl isethionate acc. example (a) (active base) 50.00 47.00 45.00 Stearin / palmitic acid 21.86 24.11 25.61 Coconut oil fatty acids 3.08 2.90 2.77 Soap of mixed tallow and coconut oil 9.07 9.82 10.32 Sodium stearate 3.00 3.00 ~ 3.00 Sodium isethionate 1.91 1.80 1.25 Sodium sodium 2,52 Sodium alkoxy Ti02 0.20 0.20 0.20 Perfume 1.00 1.00 1.00 Miscellaneous 1.75 2.04 2.25 100.00 100.00 _ 100.00 Detergent toilet bars with the above composition were tested for abrasion rate and foaming using the methods given above. The results are given in Table B. 13 7803557-3 Table B. Effects of reduction of acyl isethionate / sodium isethionate in detergent toilet bars Abrasion rate Example gel no. Abrasion rate (g / wash) 1a - 50% acyl isethionate (control) 3.40 É 0.l4 lb - 47% acyl isethionate 3.15 ï 0.09 ie - 45% acyl isethionate 2.76 ï 0.17 Foaming, panel evaluation Washing conditions gí 24 ° c / 24 ° c / 40 ° c / Tatal- 90ppm CaCO3 l80ppm l80ppm results la ~ 50% acyl isethionate (control) ll ll 13 35 lb - 47% acyl isethionate 8 8 6 22 la and lb gives equivalent foaming 1 ll 3 la - 50% acyl isethionate (control) ll l3 ll 35 lc - 45% acyl isethionate 6 5 7 18 la and lc gives equivalent foaming 3 2 2 7 The above The values given show that a decrease in acylation / sodium isethionate in combination with a corresponding increase in stearic acid / palmitic acid and soap significantly reduces the wear rate of the detergent rod. However, the foaming test of the test panel shows that the panelists experienced a reduction in the foaming effect in the rods with low acyl isethionate content with reduced wear rate compared to control rods.

Example 2.

This example shows the effect of sodium alkoxyhydroxypropanesulfonate prepared from Neodol 25 with an alkyl group = C12-C15 and NaCl on detergent toilet bars with reduced acyl isethionate content.

Detergent toilet bars with the following composition were prepared. All percentages are based on the weight of the entire bar. 780355743 M Eëlzêëí Example no. 2a 2b 2c Bar code no. Example (a) (active base) 50.00 45.00 41.00 Sodium alkoxyhydroxypropanesulfonate (alkyl group consisting of Cl2-Cl5) - 2.00 5.00 Stearin / palmitic acid 20.16 24.ll 24.86 Coconut oil fatty acid 3.08 2.77 2.53 Soap of mixed tallow and coconut oil 3.00 Sodium 8.7 9.82 9.82 Sodium 3.00 3.00 Sodium isethionate 4.68 1.72 1.56 Sodium alkylbenzenesulfonate 2.03 2.03 2.03 Sodium chloride 0.35 0.85 0.85 Water 5.25 5.25 5.25 Ti02 0.20 0.20 0.20 Perfume 1.00 1.00 1.00 other 1.75 __l¿Z5 __l¿1§ l00.00 100.00 100.00 The detergent toilet was tested wear rate and foaming properties using the methods set forth above. The results are given in Table D below.

.LD 7803557-3 Table D. Effect of appropriate amounts of sodium alkoxyhydroxypropanesulfonate (C12-C15) and NaCl on detergent toilet bars with reduced levels of acyl isethionate / sodium isethionate Abrasion rate §§emQel_Er Abrasion rate - 2 g / g / g control) 3.72 + - 0.21 2b - 45% acyl isethionate + 2% sodium alkoxyhydroxy- + propane sulfonate 3.15 0.10 2c - 41% acyl isethionate + 5% sodium alkoxyhydroxy-propane sulfonate 3.16 É 0.06 Foaming, evaluation of nanel ExemBel_g§ 4 Washing 24 / Total-80ppm CaCO l80ppm result 3 2a - control 9 10 19 2b - 45% acyl isethionate + 2% sodium alkoxyhydroxypropane sulfonate ll 8 19 Za and 2b give equivalent foaming - 2 2 2a - control 12 8 20 2c - 41% acyl isethionate + 5 % sodium alkoxyhydroxypropanesulfonate 8 10 18 2a and 2c gives equivalent foaming - 2 D Table D shows that reduction of the acyl isethionate / sodium isethionate content in combination with incorporation of sodium alkyl hydroxypropane sulfonate and gel The amount of NaCl significantly reduces the wear rate of the detergent rod. It can be seen from Table B that reduction in the wear rate (reduced acyl isethionate / sodium isethionate content and addition of NaCl) has an adverse effect on the foaming properties of the rod. However, Table D shows that an equivalent foaming effect is obtained compared to the control sample and toilet bars with reduced acyl isethionate / sodium isethionate content if an appropriate amount of alkoxyhydroxypropanesulfonate is incorporated into the composition.

Exemgel 3.

A straight chain sodium alkoxyhydroxypropanesulfonate and a 78Û3557 = š 16 chain length of C10 and C18 were prepared, and the following acyl isethionate detergent rods were prepared based thereon: Table E Example No. 3a 3b 30 Bar Code No. NS4266 NS8%% NS4 . Example (a) (active base) 50.00 41.00 41.00 Sodium alkoxyhydroxypropane sulfonate (C10) - 5.00 ~ Sodium alkoxyhydroxypropane sulfonate (C18) - - 5.00 Stearic / palmitic acid 20.16 24.86 24.86 Coconut oil fatty acid 3.08 2.53 2.5g 10g 07 Sodium stearate 3.00 3.00 3.00 Sodium isethionate 4.68 1.56 1.56 Sodium alkylbenzenesulfonate 2. 03 2. 03 2. 03 Sodium chloride 0.35 0.85 0.85 Water '5.25 5.25 _ 5.25 TiO2 0.20 0.20 0.20 Perfume 1.00 1.00 1.00 Other 1.75 2.65 2.65 100.00 100.00 100.00 Detergent toilet bars with the above composition were tested for abrasion rate and foaming properties using the method given above. The results are given in Table F.

U 78Û3557 ~ 3 Table F. Effect of appropriate amounts of sodium alkoxyhydroxypropanesulfonate (C10 and C18) and NaCl in detergent toilet bars with reduced acyl isethionate / sodium isethionate content.

Abrasion rate Sample gel No. Abrasion rate (g / wash 3a - 50% acyl isethionate (control) 3.95 3 0.17 3b - 41% acyl isethionate + 5% sodium alkoxyhydroxypropane sulfonate (C10) 3.58 É 0.11 3c - 41% acyl isethionate + 5% sodium alkoxyulfonate 3.44 in 0.12 Foaming, evaluation of panel Exemgel nr_ Washing condition see 24 ° c / z4 ° c / 4o ° c / Total- 90ppm CaCO 3 l80ppm l80ppm result 3a - 50% acyl isethionate (control) 4 9 7 20 3b - 41% acyl isethionate + 5 % sodium alkoxyhydroxypropanesulfonate (C10) 16 ll l3 40 3a and 3b give equivalent foaming - - - - 3a - 50% acyl isethionate (control) 9 9 9 27 3b - 41% acyl isethionate + 5% sodium alkoxy hydroxy ether sulfonate (C18) 8 ll 10 29 3a and 3c give equivalent foaming The values in Table F show that the combination of sodium alkoxyhydroxypropanesulfonate / sodium chloride in toilet detergent rods with reduced acyl isethionate / sodium isethionate content results in a significantly improved abrasion resistance without adverse effect in question. m foaming properties of the rod.

Example 4.

This example demonstrates the effect of adding a suitable amount of alkoxyhydroxypropanesulfonate to a reduced acyl isethionate / sodium isethionate detergent rod with and without NaCl incorporation. ._ - .. all 7003557-3 la Table G Example no. 4a 4b 4c Bar code no. NS43l2 NS43l4 NS43l5 (control) (not salt) Composition%%% Acyl isethionate acc. Example (a) (active base) 50.00 41.00 41.00 Sodium alkoxyhydroxypropanesulfonate C14 ~ 5.00 5.00 Stearic / palmitic acid 20.16 25.50 24.86 Coconut oil fatty acid 3.08 2.53 2.53 Soap of mixed tallow and coconut oil 8.50 10.28 Sodium 2,2-benzyl stearate 3,0 Sodium 2,2 Ethylbenzate 0.35 - 0.85 Water 5.25 5.25 5.25 Ti02 0.20 0.20 0.20 Perfume 1.00 1.00 1.00 Other ~ 1.75 __2¿§§ 2.65 100.00 100.00 100.00 Detergent toilet bars with the above composition were tested for abrasion rate and foaming properties using the previously specified method. The results are given in Table H.

A ___A _. Table H. Effect of appropriate amounts of sodium alkoxyhydroxypropane sulfonate with and without NaCl in reduced acyl isethionate / sodium isethionate toilet bars.

Abrasion rate Example gel no. Abrasion rate (g / wash) 4a - 50% acyl isethionate (control) 2.93 É 0.12 4b - 41% acyl isethionate + 5% sodium alkoxyhydroxypropane sulfonate (C14) (not salt) 3.05 ï 0.18 4c - 41% acyl isethionopropane + 5% sodium - sulfonate (Cl4) (0.85% salt) 2.47 | + 0.18 Foaming, panel evaluation Example no Washing conditions 24 ° c / 24 ° c / 40 ° c / Total- 90ppm CaCO3 l80ppm l80ppm result 4a - 50% acyl isethionate (control) 4 5b 14 4b - 41% acyl isethionate + 5% sodium alkoxyhydroxypropanesulfonate (Cl4) (not salt) 4 4 4 12 4a and 4b give equivalent foaming 2 l 4 4a - 50% acyl isethionate (control) 5 3 12 4c - 41% acyl isethionate + 5% sodium alkoxyhydroxyethersulfonate (C14) (0.85% salt) 5 5 7 17 4a and 4c give equivalent foaming - 1 - 1 The values in Table H show that the incorporation of an alkoxyhydroxypropanesulfonate in a detergent rod with reduced acyl isethionate / sodium isethionate content foaming ability at the level of the foaming ability of a detergent rod without reducing the acyl isethionate / sodium isethionate content (4a compared to 4b). The abrasion resistance of the detergent rod 4b was determined to be in practice as great as the abrasion resistance of the detergent rod 4a. On the other hand, when comparing the detergent rods 4a and 4c, the latter rod, which contained appropriate amounts of alkoxyhydroxypropanesulfonate and sodium chloride, showed a significant reduction in wear rate while the rod retained as good a foaming effect as the detergent rod 4a.

Claims (12)

78Û3557 "5 2 0 1. A detergent bar comprising a water-soluble acyl isethionate detergent and etho-esterified water-soluble alkali metal isethionate, characterized in that the bar contains a) from 1 to 10% by weight of an alkoxyhydroxypropanesulfonate, wherein the alkyl group is b and C ) less than 1.2% by weight of sodium chloride, the percentage mx being based on the total weight of the acyl isethionate detergent rod. 2.) A detergent rod according to claim 1, characterized in that the acyl isethionate detergent is present in an amount of from 30 to 70% of the rod. A detergent bar according to claim 1 or 2, characterized in that the acyl isethionate has the formula R COOCH 2 SO 3 M wherein R represents an aliphatic group or mixture of aliphatic groups of a higher fatty acid or mixtures thereof, with from 6 to 18 carbon atoms and an iodine value of less than 20 and M is an alkali metal cation (which definition includes ammonium) or the cation of an organic amine of triethanolamine, tri-isopropanolamine, diethanolamine or monoethanolamine. 4.) A detergent rod according to any one of the preceding claims, characterized in that the rod has a pH value in the range from 6-8 measured as a water solution of the rod composition at 35 ° C. 5.) A detergent bar according to any one of the preceding claims, characterized in that the unesterified alkali metal salt of the isethionate acid is present in an amount of from 1 to 7% of the bar. 7803557-3 Z l A detergent rod according to any one of the preceding claims, characterized in that the alkoxyhydroxypropanesulphine has the formula CH 3 - (CH 2) n - CH 2 - O - CH 2 CH (OH) CH 2 SO 3 M wherein n is an integer from 6 to 18 and M denotes sodium, potassium, calcium, magnesium or ammonium. 7.) A detergent bar according to any one of the preceding claims, characterized in that the alkoxyhydroxypropanesulphane is present in an amount of from 2 to 6% by weight of the bar. 8.) A detergent bar according to any one of the preceding claims, characterized in that sodium chloride is present in an amount of from 0.1 to 1.0% by weight of the bar. 9.) A detergent bar according to claim 8, characterized in that the sodium chloride is present in an amount of from 0.6 to 1.0% by weight. 10.) A detergent rod according to any one of the preceding claims, characterized in that the acyl isethionate is sodium acisethionate, the acyl moiety is derived from coconut oil and the salt of isethionic acid is sodium isethionate. 11. A detergent rod according to any one of the preceding claims, characterized in that the alkoxyhydroxypropanesulfonyl has an alkyl group having 12 to 15 carbon atoms. 12. A detergent bar according to any one of the preceding claims, characterized in that it contains from 2 to 10% of a water-soluble foaming stabilizing detergent selected from fatty alcohol sulphates, alkylaryl sulphonates and higher aliphatic fatty acid taurides.