DE2751053C2 - Liquid soap - Google Patents

Description

The invention relates to a liquid soap, in particular to one that is for use as Toilet soap hand cleaner is suitable in soap dispensers of the usual type, which are used in hotels, canteens, grocery stores, Offices, hospitals, industries and households can be attached.

In DE-PS 23 25 206 a liquid soap is described and claimed that is 12 to 40 percent by weight

Potassium soaps of saturated fatty acids with predominantly 12, 16 and 18 carbon atoms in the molecule, 20 to Comprises 40 percent by weight glycerin and 20 to 55 percent by weight water. The liquid soap is a creamy one Liquid of good consistency that gives a good feeling after washing and does not tend to stick to the To dry up the dispenser outlet.

It has now been found that a liquid soap with practically the same good properties, and in in some respects even better properties, i. H. compiled with lower hardness and better flushability can be by adding at least half of the glycerol in the formulation of the patent mentioned by 0.25 to 0.50 parts of its weight by an alkylene glycol from the series propylene glycol, ethylene glycol and / or di- and triethylene glycols is replaced.

The present invention thus provides a liquid soap which is essentially a fine suspension of potassium stearate / palmitate crystallites with essentially 12-40% by weight of potassium soaps of saturated fatty acids with predominantly 12, 16 and 18 carbon atoms in the molecule in an aqueous solution Glycerin solution comprises according to patent 23 25 206, which according to the invention is characterized in that it replaces at least half of the glycerin with 20 to 5 percent by weight of an alkylene glycol from the group consisting of propylene glycol, ethylene glycol and / or di- and triethylene glycol and 0-20 wt. % Contains glycerine.
The preferred alkylene glycol is diethylene glycol.

Therefore, the liquid soap according to the invention contains essentially 12 to 40 percent by weight potassium soaps of saturated fatty acids with predominantly 12, 16 and 18 carbon atoms in the molecule, 0 to 20 percent by weight

Glycerine and 20 to 5 percent by weight of an alkylene glycol from the group consisting of 1,3-propylene glycol, ethylene glycol and / or di- and triethylene glycols, the remainder being water. The liquid soap according to the invention preferably contains 0 up to 15 weight percent glycerin and 15 to 5 weight percent of the alkylene glycol.

The fatty acid component can also contain other fatty acids in smaller proportions, but in order to achieve a satisfactory one To achieve foaming behavior, the proportion of Ci2 fatty acid is desirably slightly above that Amount of Ci6 and Cie fatty acids in the medium.

All percentages relate here to the weight of the finished product, unless stated otherwise.
The potassium soaps of fatty acids with predominantly 12 carbon atoms in the molecule are preferably derived from lauric acid of commercial quality, which can also contain Ci ₀ - and Cn fatty acids in smaller proportions. Other suitable sources of C12 fatty acids are fatty acids which are derived from various nut oils, such as coconut oils and palm kernel oils, in particular those fractions which have been freed from lower fatty acid components by fractional distillation. The liquid soap according to the invention preferably contains about 7 to 20 percent by weight of potassium laurate.

The potassium soaps of fatty acids with predominantly 16 and 18 carbon atoms in the molecule are conductive preferably from commercial grades of stearin, which also includes fatty acids of different chain lengths may contain in smaller proportions. Another suitable source of Qe-Ci8 fatty acids are the fully hydrogenated tallow fatty acids and other animal fats with high proportions of Ci6-Cie fatty acids. The proportion of potassium Ci6-Qe fatty acid soaps is preferably about 5 to 20 percent by weight Liquid soap according to the invention as a whole.

The liquid soap according to the invention can further contain the usual additives, as desired, e.g. B. a suitable one Perfume, colorants, preservatives, thickeners and germicides. With a preferred Embodiment of the invention, the product contains free fatty acids in an amount of up to 10, preferably 2 up to 5% of the total composition in order to give it superfatting properties. A particularly suitable one Superfatting agent is stearic acid, which alone or in conjunction with other known superfatting agents Aids can be used. Another improvement to the product, although not essential to that Invention, can be obtained by adding a small amount of a thickener. A desired viscosity range is between about 1000 and 200OcP at 10 to 25 ° C. The use of a thickener can be kept to a minimum by the presence of a small amount of sodium soap. the the exact amount that is necessary to control the consistency of the product is not critical and is important for the Professional on hand.

The creamy liquid soap according to the invention can be prepared as follows:

Glycerin and / or alkylene glycol and water in suitable weight ratios are slow Stir in a stir tank and mix until a homogeneous mixture is obtained. The mixture will

then heated to about 65 to 85 ° C and then the required amount of potassium hydroxide is added

With slow stirring, the required amount of fatty acid is then gradually added in two stages, e.g. B. the lower fatty acids comprising the Ci2 fatty acids are added first with slow stirring until a clear solution is obtained, and then the higher fatty acids comprising the Cie-Oe fatty acids are added with further stirring until a clear solution Solution is then not heated any more and further components can be added. After the last component has been added, the product is allowed to cool very carefully and slowly in the container, ie with a temperature drop of not more than 10 ^° C. per hour.

If a thickener is used, it should expediently be mixed with part of the glycerine and / or glycol-water mixture be mixed. Any sodium hydroxide required can be used along with the potassium hydroxide solution can be added.

Slow stirring and careful cooling are important measures in the process to prevent formation to favor a fine suspension of potassium stearate crystallites, which are clearly distinguishable under the microscope and give the product its pure white appearance.

Rapid cooling, on the other hand, tends to cause the flocculation of potassium stearate, which in particular is separates on the container wall as white lumps A suitable apparatus for carrying out the invention Process is a double-walled stainless steel mixing vessel equipped with a self slowly rotating agitator. The double wall of the mixing container creates a means for heating with indirect steam or hot water and also a means of slow and careful cooling after the Steam or the hot water have been turned off and the container is removed with its contents by leaving it standing Leave room conditions or with the help of a coolant to their own devices.

The invention is further illustrated by the following non-limiting examples

Examples I-V

The following creamy white liquid soaps have been put together:

The hydroxyethyl cellulose was dispersed in the glycol and slowly added to the 50% of the water in the container given with slow mixing. The sodium tetraborate was then added and mixing continued until a clear solution was obtained and then the remaining water was added.

The mixture was heated to 75 ° C, and potassium hydroxide and sodium hydroxide were then taken Stir added. Coconut fatty acid, lauric acid, and stearic acid were in that order with stirring admitted. With continued stirring, the product was slowly cooled. Perfume was added as the Temperature had reached a value below 55 ° C.

composition I. U III IV V Wt% Coconut fatty acid 3.45 3.45 3.45 3.45 3.45 Lauric acid (technical quality) 4.70 4.70 4.70 4.70 4.70 Stearic acid (technical grade) 6.85 6.85 6.85 6.85 6.85 Glycerin 5.0 10.0 - - _ Propylene glycol - - _ 10.0 Diethylene glycol 5.0 5.0 10.0 - - Triethylene glycol - - - - 10.0 Potassium hydroxide (36%) 7.82 7.82 7.82 7.82 7.82 Sodium hydroxide (50%) 0.24 0.24 0.24 0.24 0.24 Hydroxyethyl cellulose (thickener) 0.65 0.65 0.65 0.55 0.55 N atrium tetraborate decahydrate 0.34 0.34 0.34 0.34 0.34 Perfume 0.30 0.30 0.30 - - water 65.65 65.65 65.65 66.05 66.05

Product features

Viscosity (cP) at 10 ° C and 20 ° C 1000 - 1500

free fatty acid 2.5

Total fatty acids 15.0

The above compositions were stable for 3 months when stored at 35 ° C.

Test samples showed no signs of skin irritation, unpleasant odor or unpleasant feeling on the hands during or after use. In-use foam properties were measured on 0.7 g samples of the product was determined with slightly soiled hands using water at 18 ° GH. To the For comparison, a 10% conventional toilet soap solution was used.

All compositions I-V were superior to 10% toilet soap solution.

The soap compositions were stored in various commercially available soap dispensers. she were not clogged even after 25 days of non-use.

Example VI
As in Examples I-V, the following creamy white liquid soap was produced:

composition ; C, ₇ ) Viii VII ₂ B eispi el VIl VI VU ₄ A. B. C. Stability E. 5 free stearic acid Wt% water 3.45 3.45 53.2 3.45 3.45 3.45 3.45 D. 3.45 Glycerin 4.70 4.70 10.0 4.70 4.70 4.70 4.70 4.70 5.0 3.45 10 6.85 6.85 13.2 6.85 6.85 6.85 6.85 4.70 6.85 5.8 Diethylene glycol 10.0 - 5.8 - - - - 6.85 - K-Laurate - 10.0 0.8 - - - - - K palmitate - - 1.8 - - - - - - 15th K-stearate - - 10.0 - - - - - Na-Laurat - - 3.5 - 10.0 - - - - - - 0.9 - - 10.0 - - - - - - - - 10.0 - - 20th - - - - - - - - - _ - - - - - 10.0 7.82 7.82 7.82 7.82 7.82 7.82 10.0 7.82 25th 0.24 0.24 0.24 0.24 0.24 0.24 - 0.24 Perfume, preservatives, thickeners 0.55 0.55 0.55 0.55 0.55 0.55 7.82 0.55 0.34 0.34 0.34 0.34 0.34 0.34 0.24 0.34 66.05 66.05 66.05 66.05 66.05 66.05 0.55 6G.05 30th The following compositions were found 0.34 steady: 66.05 composition (Weight percent) Coconut fatty acid 35 Lauric acid (technical quality Stearic acid its "drying effect" and physical (technical quality) Ethylene glycol VI ₃ 40 Diethylene glycol Triethylene glycol 3.45 Propylene glycol 4.70 Na / K soap of other fatty acids Polyethylene glycol 200 (C6; Cio; C | 4 Polyethylene glycol 400 6.85 45 Polyethylene glycol 600 Hexylene glycol - Sorbitol - KOH (36%) 10.0 NaOH (50%) - Hydroxyethyl cellulose - Borax, decahydrate - water - - - 7.82 0.24 0.55 0.34 66.05

The tendency to dry out is examined with a test in which a quantity of product is left open for 5 days Petri dishes being held. The water loss is measured and the hardness of the residue is determined. the The results of this investigation can be found in the following table:

⁵⁰ table

Hardness of the residue after 5 days

composition at 20 ^o C / ö5% at 25 ° C / 30% Stability at rel. Humid rel. Humid : 35 ° Cn. 1 month VII ₁ very soft soft Well VII ₂ very soft soft Well VII ₃ very soft soft Well VII ₄ moderately soft hard Well A. hard hard unstable B. hard hard unstable C. hard hard unstable D. hard hard unstable E. hard not determined unstable

Only the compositions VIII-VIl ₄ according to the invention appear to be sufficiently stable and have no serious tendency to dry out under normal conditions.

Claims (2)

Patent claims: 1. Liquid soap, which is essentially a fine suspension of potassium stearate / palmitate crystallites with essentially 12-40% by weight potassium soaps of saturated fatty acids with predominantly 12, 16 and 18 carbon atoms in the molecule in an aqueous glycerol solution comprises according to patent 23 25 206, thereby characterized in that it replaces at least half of the glycerol from 20 to 5 percent by weight an alkylene glycol from the group consisting of propylene glycol, ethylene glycol and / or di- and triethylene glycol and contains 0-20% by weight glycerin 2. Liquid soap according to claim 1, characterized in that the alkylene glycol is diethylene glycol