DE1125581B - Manufacture of a bactericidal liquid soap - Google Patents

Description

The invention relates to the production of liquid soaps, which are used in particular as toilet soap in the usual Dosing devices especially in the food industry and to avoid so-called hospitalism are useful.

The use of solid soap in hospitals and in the food industry is often a cause of infections, even if the soap contains bactericides, because the bars of soap are used by a large number of people to be used. This disadvantage is reduced if you dispense liquid soap from a dispenser used. Nevertheless, it is desirable to impart bactericidal properties to the liquid soap as well.

It is known that soap can be given bactericidal properties by adding certain bactericides can, which do not lose their effectiveness in the presence of soap and in the following as with Soap compatible bactericides are called, e.g. B. bis - (3,5,6 - trichloro - 2 - oxyphenyl) - methane, 2 - oxy-5-chlorobenz-3 ', 4'-dichloroanilide, Tetramethylthiuram di-ao sulfide, 3,4 ', 5-tribromosalicylanilide and 3,3', 4 ', 5-tetrachlorosalicylanilide.

However, these bactericides are all sparingly soluble in aqueous solutions of ordinary soaps. In addition, fall when dissolving a sparingly water-soluble bactericide in an ordinary liquid soap high-melting point Components of the liquid soap, which together with the dissolved part of the bactericide one Result in sediment. It is therefore not possible to achieve a stable, uniform distribution of these bactericides in this way reach.

It has now been found that the above disadvantages can be overcome by using certain soaps and free fatty acids can eliminate or reduce, whereby a liquid soap is obtained in which the bactericide remains suspended in stable form.

The invention relates to a method for producing a bactericidal liquid soap, consisting of from 8 to 30% alkali soaps of fatty acids with essentially 6 to 14 carbon atoms, 2 to 8% Alkali soaps of fatty acids with 16 to 20 carbon atoms, 1 to 6% free fatty acids with 16 to 20 carbon atoms and a poorly water-soluble, soap-compatible suspended bactericide. All percentages are based on the total weight of the liquid soap.

The alkali soaps of the fatty acids with essentially 6 to 14 carbon atoms are preferably of Palm kernel or coconut oil derived; a suitable amount of this component is 15 to 25 percent. Appropriate 3 to 5% soaps of fatty acids with 16 to 20 carbon atoms and 1.5 to 4% free fat production are used a bactericidal liquid soap

Applicant:
Unilever NV, Rotterdam (Netherlands)

Representative: Dr.-Ing. A. van der Werth, patent attorney, Hamburg-Harburg 1, Wilstorfer Str. 32

Claimed priority:
Great Britain October 14, 1959 (No. 34 865)

Gustaf Vilhelm Fred Atterby, Nyköping (Sweden), has been named as the inventor

acids which can be the same as those from which the latter soaps are derived. It It can be advantageous to use both components in the form of free fatty acids in a mixture of the other ingredients add, which contains enough alkali to saponify the required amount of fatty acid.

The soaps are preferably potassium soaps; but one can depending on the composition of the fatty acids also use sodium soaps or mixtures of both soaps. The free fatty acid is preferred applied in the form of particles of the order of 0.5 to 100 μ; a particularly suitable particle size is 10 to 50 μ.

The bactericide preferably used according to the invention is bis- (3,5,6-trichloro-2-oxyphenyl) methane. Other soap-compatible bactericides can also be used successfully, e.g. B. 2-oxy-5-chlorobenz-3 ', 4'-dichloroanilide, Tetramethylthiuram disulfide and similar thiuram compounds, or halogenated Salicylanilides such as 3,4 ', 5-tribromosalicylanilide and 3,3', 4,5-tetrachlorosalicylanilide. It is also possible, Use mixtures of two or more of these bactericides.

The liquid soap produced according to the invention preferably contains 0.1 to 3.5%, in particular 0.3 up to 2%, of the bactericide. This soap can further contain 0.1 to 5% of a cosmetic emollient such as cetyl alcohol or lanette wax, and, depending on the desired viscosity, up to 3 * / o of a thickener, z. B. carboxymethyl cellulose.

The production process according to the invention consists in that a suitable mixture of neutral Fats with mainly fatty acid residues with 6

209 519/430

saponified up to 14 carbon atoms using a calculated excess of alkali and then a solution or suspension of the bactericide in a melt of the selected free fatty acids with 16 to 20 carbon atoms with stirring at elevated temperature, e.g. B. 60 to 90 ° C, is added, the excess of alkali and the amount of free fatty acid can be calculated such that, after saponification, the desired amounts of soap with 16 to 20 carbon atoms and free fatty acids with 16 to 20 carbon atoms can be obtained. The mixture will then cooled to a temperature of about 10 to 25 ° C, preferably 15 to 20 ° C. That way becomes a stable dispersion of extremely fine fatty acid crystals and a bactericidal in an alkaline one Soap solution obtained.

The liquid soap is preferably made as follows:

The fats are melted in a vessel equipped with a suitable stirrer and heated to approx 65 to 85 ° C, e.g. B. 75 ° C, heated, together with the total amount of alkali to be used, z. B. sodium and / or Potassium hydroxide dissolved in about 35% of the total amount of water to be used, which 50 to 85% of the weight of the liquid soap. After 2 to 3 hours the fat is completely saponified. Then about 40% of the total amount of water is added, whereupon a melt with a temperature of about 75 ° C, consisting of an excess of free fatty acid and the optionally used Plasticizer in which the bactericide is dissolved or dispersed is gradually added with stirring. The excess alkali is neutralized to form the soap. It is adding the remaining water continue stirring until the suspension is completely homogeneous. The reaction mixture is then under steady Stir to about 10 to 25 ° C, preferably 15 to 20 ° C, cooled, with the excess alkali is neutralized with the formation of soap. It is stirred with the addition of the remaining water until the Suspension is completely homogeneous. The reaction mixture is then with constant stirring on the mentioned Maintained temperature, the excess free fatty acid crystallized out. The obtained in this way Suspension of bactericide and free fatty acid in the soap solution is at a temperature below 30 ° C completely stable.

Example 3

Weight percent

example 1

Weight percent

Coconut oil 10.0

Palm kernel oil 3.6

Potassium hydroxide (87%) 4.5

Stearic acid (technical) 7.5

Cetyl alcohol 0.5

bis- (3,5,6-trichloro-2-oxyphenyl) -

methane 0.6

Water 73.8

Example 2

Weight percent

Palm kernel oil 12.0

Potassium hydroxide (87%) 4.2

Lanette wax 0.8

Stearic acid (technical) 5.0

Carboxymethyl cellulose 0.6

bis- (3,5,6-trichloro-2-oxyphenyl) -

methane 1.2

Water 76.2

65

Coconut oil 15.0

Potassium Hydroxide (87%) 4.0

Sodium hydroxide (98%) 1.3

Peanut fatty acid 2.0

Stearic acid (technical) 5.7

2-oxy-5-chlorobenz-3 ', 4'-dichloroanilide 2.5

Carboxymethyl cellulose 1.8

Water 67.7

The liquid soaps according to Examples 1 and 2 were prepared in the manner described above. The product according to Example 3 was also produced in this way, but with the difference that after the saponification is complete, first a melt of peanut fatty acids and then a melt of stearic acid and bactericide were added. The carboxymethyl cellulose was used together with the last portion of water added.

A liquid soap made in accordance with the invention the composition according to Example 1, freshly prepared, has a viscosity at a temperature of 18 ° C of about 100 cP, which increases slightly when the soap is stored. A viscosity of this magnitude is generally preferred when the soap is used in dispensers. By adding a thickener it is possible to achieve any desired viscosity up to 4000 cP to obtain.

A particular advantage of the liquid soap according to the invention is their relatively low p _H. A normal soap has, while a liquid soap pg generally has a p _H of about 10.5 in a 20% aqueous solution according to the invention of not more than 10, usually from 8.5 to 9.5.

Claims (6)

PATE NTAN S PRÜCH Ε: 1. A process for the preparation of a stable bactericidal soap, characterized in that a mixture of neutral fats, essentially derived from fatty acids having 6 to 14 carbon atoms, is saponified with an excess of alkali, then a solution or suspension of a sparingly water-soluble bactericide in a Melt containing free fatty acids with 16 to 20 carbon atoms is added and the mixture is then cooled, the excess of alkali and the amount of free fatty acids being calculated in such a way that, after saponification, the corresponding aqueous suspension of the sparingly water-soluble bactericide is 8 to 30%, preferably 15 to 20% alkali soap of fatty acids with 6 to 14 carbon atoms, 2 to 8%, preferably 3 to 5%, alkali soap of fatty acids with 16 to 20 carbon atoms and 1 to 6%, preferably 1.5 to 4% , contains free fatty acids with 16 to 20 carbon atoms. 2. The method according to claim 1, characterized in that that you saponify the fats at a temperature of about 65 to 85 ° C, then the solution or suspension of the bactericide at a temperature of about 60 to 90 ° C and then adding the Mixture is cooled while stirring to about 10 to 25 ° C in such a way that the resulting in this way free fatty acid crystals one size from 0.3 to 100 μ, preferably from 10 to 50 μ. 3. The method according to claim 1 and 2, characterized in that one adds as much bactericide as that the corresponding suspension has a bactericide content of 0.1 to 3.5%, preferably 0.3 to 2%. 4. The method according to claim 1 to 3, characterized in that as a bactericide z. B. to- (3.5, 6-trichloro-2-oxyphenyl) methane is added. 5. The method according to claim 1 to 4, characterized in that a cosmetic plasticizer, such as B. cetyl alcohol is added. 6. The method according to claim 1 to 5, characterized in that a thickener such as z. B. carboxymethyl cellulose is added. Considered publications:
German patent specification No. 244 827. > 209 519/430 3.62