JPS6254160B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a method of preparing a mixed solution of mixed fatty acids or esters thereof, lower alcohols, and water, which are mainly composed of higher saturated fatty acids including saturated fatty acids having branched carbon chains, in a mixed alkali of potassium hydroxide and sodium hydroxide. Saccharides, polyhydric alcohols, sequestering agents, and in some cases, fragrances, pigments, etc. are added to the reaction product obtained by oxidation or saponification, and the mixture is cooled, solidified, cut, and aged using a frame kneading method. The present invention relates to a method for producing transparent soap by stamping, which is excellent in transparency, and has good safety, stability, and plasticity. Traditional frame-kneaded transparent soaps are usually made with beef tallow, mustard oil,
Sugars and polyhydric alcohols are added to the reaction product obtained by saponifying animal and vegetable oils such as palm oil, palm kernel oil, olive oil, and castor oil, or a mixed solution of these fatty acids, lower alcohols, and water with sodium hydroxide.
In the case of obtaining transparent soap glue, animal and vegetable fats and oils or their fatty acids are saponified with sodium hydroxide using water as a solvent, and then salted out with sodium chloride to obtain a dry or undried soap base, which is then mixed with lower alcohol,
Transparent soap glue may be obtained by adding and dissolving water, sugars, and polyhydric alcohols. A commonly used method is to pour the thus obtained transparent soap glue into a frame, cool it, solidify it, cut it, age it, and mold it to obtain a transparent soap. In the case of transparent soap, it goes without saying that its excellent transparency has great commercial value, and improving transparency is a permanent research topic in related industries. Conventional techniques for improving the transparency of the transparent soap obtained as described above include the following. Japanese Patent Publication No. 18984/1986 discloses that transparency can be improved by adding a large amount of glycols, especially propylene glycol, and triethanolamine salt, an anionic surfactant.
In Japanese Patent Publication No. 48-42935, it is stated that transparency is improved by adding a free acid of an anionic surfactant such as lauroylsarcosinate or dodecylbenzenesulfonic acid. According to Japanese Patent Publication No. 51-8121, transparency can be improved by adding an alkanolamine salt of an anionic surfactant to transparent soap glue and adjusting the free alkali content to 0% or less. , a technique has been disclosed in which transparency is improved by adding a neutral salt such as potassium chloride or potassium sulfate to transparent soap glue. However, although transparency can be improved to some extent using these manufacturing methods, the solidifying point of the transparent soap glue is significantly lowered due to the influence of these additives during manufacturing, making it difficult to solidify and causing problems in the manufacturing of transparent soap. There is an inappropriate phenomenon. Furthermore, when the transparent soap obtained in this way is used, it becomes very easy to swell, melts and disintegrates, and the transparency may be significantly impaired during use, and the odor and color may change. It had drawbacks such as poor stability. In general, conventional techniques for improving the transparency of frame-kneaded transparent soap include the balance of the blended oil and fat composition (increasing the components of castor oil and coconut oil), the blending amount of lower alcohol (increasing), and the blending amount of sugars (increasing the content of castor oil and coconut oil). However, each of these methods has its own drawbacks. That is, when the castor oil and coconut oil components are large, the solid physical properties deteriorate and the solubility and dissolution become large. If there is a large amount of lower alcohol, the ripening period will be long, the deformation will be severe at the end of ripening, and the moldability will be poor. Furthermore, if the sugar content is large, powdering may easily occur during ripening or in the form of a product, which may eventually lead to opacity. On the other hand, the safety of soap is influenced by the irritant nature of the alkaline salts of its constituent fatty acids. In other words, the irritating properties vary depending on the type of carbon in the constituent fatty acids. Among the major fatty acids, the most irritating groups are C ₁₀ capric acid, C ₁₂ lauric acid, and C _18F-1(OH). Alkaline salts of ricinoleic acid and C18F _-1 oleic acid, and less irritating groups include alkali salts of _C14 myristic acid, _C16 palmitic acid, and _C18 stearic acid. Regarding the stability of soaps, it is well known that among the constituent fatty acids, unsaturated fatty acid soaps are chemically unstable and have an adverse effect. Based on these facts, in order to improve the safety and stability of transparent soap, C ₁₀ , C ₁₂ , C
If the components of each fatty acid such as _{18F-1C 18F-1(OH)} are simply reduced, the foaming property, which is an important property for soap, will be significantly inferior, and the plasticity, which is an important factor in manufacturing, will be deteriorated. It has been difficult to significantly improve the transparency, safety, and stability of conventional transparent soaps because of the tradeoffs such as inferiority. The present inventors researched the properties of saturated primary fatty acids obtained by oxidizing oxo alcohols, saturated primary fatty acids obtained by dimerizing animal and vegetable oils, and their derivatives, and found that the relationship between these fatty acids and linear saturated fatty acids It was found that the transparent framed soap obtained by neutralizing the mixed fatty acids of 100% with a mixed alkali of potassium hydroxide and sodium hydroxide has extremely good transparency and is excellent in safety, stability, and solid physical properties. did. The present invention uses the general formula: 2 to 15 parts of a saturated fatty acid with a branched chain after the β position (n = 6 _to 16, m = _{1 to} 4); Chain saturated fatty acids (l=5-17) 80-98
A mixture of mixed fatty acids or esters thereof, lower alcohols, and water containing 10 parts or less of other fatty acids is mixed with 5 parts of potassium hydroxide.
Sugars,
By adding polyhydric alcohols and cooling, solidifying, cutting, maturing, and molding using a frame kneading method, the transparent soap obtained in this way has excellent transparency, and is safe, stable, and It has excellent solid state properties. In other words, potassium soap, which is used in some machine-mixed soaps and liquid soaps, has a higher content of water, lower alcohols, polyhydric alcohols, etc. than sodium soap, which occupies an overwhelming position in general bar soaps. It has been confirmed that they are easily soluble in mixed solvent systems and have good foaming properties, but when applied to transparent frame kneaded soaps, they are significantly more transparent than conventional sodium soaps alone. They found that it improved. However, simply increasing the mole percent of potassium hydroxide in the mixed alkaline solution to be neutralized or saponified and increasing the potassium soap significantly lowers the freezing point of the transparent soap glue, making the soap softer and making it difficult to manufacture. When used as a product, the solid physical properties are significantly reduced, such as being easily swollen, easy to dissolve, and easy to melt and crumble, resulting in a loss of commercial value. Therefore, as mentioned above, by limiting the fatty acid composition and the molar ratio of potassium hydroxide and sodium hydroxide in the mixed alkali to be neutralized or saponified, these drawbacks can be improved, and excellent transparency, productivity, and hardness can be achieved. The unique feature is that a transparent soap with good mold properties was obtained. In the case of general machine-kneaded cosmetic soaps, the partial application of branched saturated fatty acids to the fatty acid moiety constituting the soap for the purpose of improving stability is disclosed in Japanese Patent Publication No. 47-20632, Japanese Patent Publication No. 47-29164, and Japanese Patent Publication No. 47-29164. Kosho 48−
42934, etc., the branched saturated fatty acids in those cases are alpha-branched saturated fatty acids made from linear olefin as a starting material, and the blending amount is also preferably linear saturated fatty acids. It is suggested that a relatively large amount of α-branched fatty acid be added, such as 30 to 60 parts or 15 to 40 parts per 100 parts. In contrast, the present invention is characterized in that it significantly improves the transparency of frame-kneaded transparent soaps, which require special techniques even among toilet soaps, by oxidizing oxo alcohol in a limited fatty acid composition. It contains saturated fatty acids with branched chains after the β position obtained by dimerizing animal and vegetable oils and fats, and the optimal amount of these is 2 to 15% of the total fatty acids, but higher amounts are recommended. If this is done, the freezing point of the resulting transparent soap glue will be lowered, making it difficult to manufacture.
It is known that when used as a product, solid physical properties such as swelling and melting and disintegration are significantly reduced. To the transparent soap glue obtained in the present invention, a polyether type compound obtained by addition polymerizing 2 to 100 moles of propylene oxide to a polyhydric alcohol mother core and addition polymerizing 50 moles or less of ethylene oxide to the main chain is added to the anhydrous transparent soap glue. Add 2 to 20 parts to 1 part, add sugars, polyhydric alcohols, sequestering agents, pigments, fragrances, etc., dissolve by heating, and pour into the frame.
Excellent transparency during cooling, solidification, cutting, and stamping, as well as the feeling of use and after-use (smooth, no sticky feeling)
It is also possible to obtain transparent soap with excellent properties. Example 1 Mixed fatty acids (straight chain saturated fatty acids with 10 to 20 carbon atoms)
Kg, 5 Kg of branched saturated fatty acids with a branched chain after the β-position with 10 to 20 carbon atoms, 5 Kg of other fatty acids, average neutralization value 236), 100 Kg, and 65 Kg of ethanol in a reaction vessel.
Mix and heat to ~70℃ and add 4.7Kg of potassium hydroxide separately.
Neutralize 13.3 kg of sodium hydroxide with a mixed alkali dissolved in water, and after the reaction is finished, add 37 kg of sugar, 50 kg of glycerin, and 58 kg of water (total of the amount used for dissolving the alkali) while maintaining the temperature at 65 to 80 °C. Add and dissolve to obtain transparent soap glue. After adjusting the free alkali, it is colored and flavored, poured into a predetermined frame, cooled, solidified, cut, aged, and molded to obtain a transparent soap. There were no particular problems in manufacturing using the method described above. Furthermore, the transparency of the thus obtained transparent soap (product of the present invention) and the conventional product are as shown in the table, and the product of the present invention was clearly superior in transparency. Furthermore, when these samples were packaged and left at 37°C for 2 months to observe their stability, the invented product was better than conventional products and commercially available products, with less change in color tone and odor. Comparison of transparency: Cut the measurement sample to a certain thickness and use the Keihin Densokki Universal Color Computer UNICC-33H.
The transmittance of visible light was measured using

[Table] As is clear from the above table, the products of the present invention have extremely high transmittances for both soap bases and soap products, indicating that they are excellent in transparency. Example 2 Mixed fatty acids (straight chain saturated fatty acids with 10 to 20 carbon atoms 90
Kg, 5 Kg of branched saturated fatty acids with a branched chain after the β-position with carbon numbers 10 to 20, 5 Kg of other fatty acids: average neutralization value 236) To 100 Kg, 45 Kg of ethanol was added to 50 Kg in a reaction vessel.
Warm the mixture to ~70°C. Potassium hydroxide 5.3
Kg and 12.5 Kg of sodium hydroxide are neutralized with a mixed alkali dissolved in water, and after the reaction is completed, the temperature is maintained at 65-80°C. To this, 37 kg of sugar, 37 kg of glycerin, and 2 to 100 moles of propylene oxide were added to the polyhydric alcohol mother nucleus, and ethylene oxide was added to the main chain.
Addition-polymerized polyether compound 12 of 50 mol or less
Kg, and 53 kg of water (total of the amount used for alkali dissolution) are added and dissolved to obtain transparent soap glue. After adjusting the free alkali, it is colored, flavored, poured into a predetermined frame, cooled, solidified, cut, aged, and molded to obtain a transparent soap. There were no particular problems in manufacturing using the method described above. In addition, 20 women's panels were asked about the transparent soap of the present invention obtained in this way and the conventional transparent soap.
When a face wash test was conducted with 20 people, all 20 people judged that the product of the present invention had a better feeling of use, with no feeling of tightness on the skin after use.

Claims (1)

[Claims] 1. General formula 2 to 15 parts of a saturated fatty acid with a branched chain after the β position (n = 6 _to 16, m = _{1 to} 4); Chain saturated fatty acids (l=5-17) 80-98
of potassium hydroxide and sodium hydroxide containing 5 to 40 mol% of potassium hydroxide. A transparent soap characterized by adding sugars and polyhydric alcohols to a saponification reaction product obtained by neutralization or saponification with a mixed alkali to obtain a transparent soap glue, which is then made into a transparent soap by a frame kneading method. manufacturing method.