CN1083008C - Soap composition - Google Patents

Abstract

The present invention provides a soap composition which is hardly softened or deformed by immersion in use, has good foaming properties, and can be made of inexpensive materials. As the main raw material for soap production, 60-92% (weight) of fatty acid salts derived from palm kernel oil and fatty acid salts derived from palm stearin can be used in a weight ratio of 7:3-3:7. Fatty acid soap, 3-20% (weight) of higher fatty acids with 8-22 carbon atoms and 5-20% (weight) of water.

Description

soap composition

The present invention relates to a soap composition which is hardly softened or deformed by soaking in use, has good foaming properties, and can be made from inexpensive materials.

Common methods of soap production include neutralizing fatty acids, obtained by hydrolyzing fats, such as tallow, coconut fat or palm oil, with aqueous sodium hydroxide solution, or directly saponifying the above fats to obtain a soap-based composition, to which fragrances are subsequently added , pigments, etc.

Typically, fats used as raw materials in soap production include 60-80% by weight tallow and 20-40% by weight coconut oil. The composition of the raw fat greatly affects the performance, feel and cost of the soap product. In order to produce a soap which is hardly deformed by soaking when used in a bath, for example, it is required to increase the ratio of tallow containing a relatively large amount of fatty acid having a long carbon chain. However, increasing the proportion of tallow containing a large amount of fatty acids having long carbon chains reduces the solubility of soap in water and also reduces foaming properties, thereby causing a decrease in foam volume. When the proportion of coconut oil containing a relatively large amount of short-chain fatty acids was increased to solve these problems, the solubility of soap in water was improved and the foaming properties were improved. In this case, however, the soap is severely deformed by soaking. Also, coconut oil is more expensive than tallow, resulting in increased product cost.

Therefore, it has been proposed a method of improving soap foaming properties at low cost without excessively increasing the proportion of coconut oil, in order to eliminate deformation caused by immersion. The method includes using an excess of the fatty acid over sodium hydroxide in the step of neutralizing the fatty acid so that the soap contains free fatty acid. However, when the soap contains a very large amount of free fatty acids, the hydrophobicity on the surface of the soap is increased, with the result that the solubility of the soap in water is particularly reduced at relatively low temperatures (for example, about 10° C. or below 10° C.) , and, the foaming properties of soap are also greatly reduced at low temperatures. Therefore, there is a limit to the amount of fatty acid added to soap in order to improve lather.

Although, in order to improve the sudsing properties, the soap made from the mixture of tallow and coconut oil contains free fatty acids, but there still arises a problem that good sudsing and strong deformation resistance are difficult at low cost under soaking conditions. Simultaneously.

In order to solve this problem, JP-A-6-57298 has proposed a kind of solid soap composition, and this solid soap composition is mixed with the natural fatty acid soap containing palm oil fatty acid salt and coconut oil fatty acid salt by higher fatty acid and water (The term "JP-A" as used herein means "Unexamined Published Japanese Patent Application"). Palm oil and coconut oil are used as raw fats in this soap bar composition. That is, tallow in common raw materials is partly replaced by palm oil. However, the solid soap composition described therein has disadvantages that high-cost palm oil used as a raw material raises product cost, and another disadvantage is that softening and deformation cannot be sufficiently suppressed because palm oil used as a raw material contains a large amount of oil acid.

In order to solve the above-mentioned problems faced in the prior art, the object of the present invention is to provide a soap which is good in foaming property, hardly deformed by soaking, and which can be produced at low cost.

The present inventors found that the above object can be achieved by using palm kernel oil and palm stearin in a specific proportion as raw material fat to prepare fatty acid soap, thus completing the present invention.

Accordingly, the present invention provides a soap base composition and a soap composition. The soap base composition comprises fatty acid salt derived from palm kernel oil and fatty acid salt derived from palm stearin, and its weight ratio is 7:3-3:7; soap composition comprises 60-92% (weight) Fatty acid soaps containing fatty acid salts derived from palm kernel oil and fatty acid salts derived from palm stearin in a weight ratio of 7:3-3:7, 3-20% by weight, having 8-22 carbon atoms Higher fatty acid and 5-20% (weight) water.

Now, the present invention will be described in detail.

The fatty acid soaps used in the soap compositions of the present invention include mixtures consisting essentially of fatty acid salts derived from palm kernel oil and fatty acid salts derived from palm stearin.

Fatty acid salts derived from palm kernel oil are obtained by saponifying palm kernel oil obtained by pressing palm kernels or extracting palm kernels with a solvent, with alkali metal hydroxides or alkaline earth metal hydroxides. In addition, fatty acid salts can also be obtained by neutralizing fatty acids derived from palm kernel oil with alkali metal hydroxides or alkaline earth metal hydroxides. Palm kernel oil contains high amounts of lauric acid, which gives soaps good lather. Therefore, by using palm kernel oil as a raw material fat, soap having good foaming properties can be produced at low cost.

As far as the fatty acid composition of fatty acids derived from palm kernel oil is concerned, it has been suggested that from the point of view of foaming properties, a composition comprising 50-60% by weight lauric acid, 10-20% by weight myristic acid and Those fatty acid compositions of 15% by weight oleic acid.

Fatty acid salts derived from palm stearin are obtained by fractionating palm oil obtained by pressing palm peel into palm stearin (in the form of solid fat at 20-25°C) and palm olein (in the 20-25°C in liquid fat form), palm stearin is then saponified with alkali metal hydroxide or alkaline earth metal hydroxide. In addition, it can also be obtained by neutralizing fatty acids derived from palm stearin with alkali metal hydroxides or alkaline earth metal hydroxides. Palm stearin is the residue obtained after fractionation of palm oil and recovery of palm olein which contains large amounts of expensive oleic acid which can be used in the food industry. Therefore, palm stearin is cheaply available and contains a small amount of oleic acid compared to palm oil. Therefore, by using palm stearin as raw material fat, soap that can avoid softening and deformation due to soaking can be produced cheaply.

As far as fatty acid compositions of fatty acid salts derived from palm stearin are concerned, it has been suggested that from the viewpoint of avoiding deformation due to immersion, one should use palmitic acid comprising 50-70% by weight, 3-8% by weight ) those fatty acid compositions of stearic acid and 25-35% by weight of oleic acid.

In the present invention, the weight ratio of the fatty acid salt derived from palm kernel oil to the fatty acid salt derived from palm stearin is 7:3-3:7, preferably 6:4-4:6. Although, by increasing the ratio of fatty acid salts derived from palm kernel oil, the foaming properties can be improved, but when the ratio of fatty acid salts derived from palm kernel oil exceeds 7:3, the soap composition will be significantly softened and softened due to soaking. out of shape. On the other hand, when the ratio of fatty acid salt derived from palm stearin exceeds 3:7, the solubility of the soap composition in water is significantly reduced and the foaming performance is reduced.

The soap composition of the present invention also includes a higher fatty acid having 8-22 carbon atoms in order to produce a creamy lather. The number of carbon atoms of these higher fatty acids should be controlled at 8-22. This is because higher fatty acids having less than 8 carbon atoms strongly irritate the skin and have an unpleasant smell. On the other hand, higher fatty acids having more than 22 carbon atoms have very high melting points, so that the solubility of soap in cold or warm water decreases.

As these higher fatty acids, linear or branched, saturated or unsaturated fatty acids can be used. Examples thereof include mono fatty acids such as lauric acid, myristic acid, palmitic acid and stearic acid, natural fatty acids such as fatty acids derived from palm kernel oil, fatty acids derived from palm stearin, coconut oil fatty acids and tallow fatty acids. Either one of these fatty acids or a mixture thereof can be used. Specifically, fatty acids derived from palm kernel oil are preferably used from the viewpoint of foamability.

These higher fatty acids can either be added to the above soap base composition, or can exist in the soap base composition in the form of unneutralized fatty acid by adjusting the neutralization degree of the raw fatty acid.

The soap composition of the present invention contains 3-20% (weight), preferably 5-15% (weight) of higher fatty acids. When the content of the higher fatty acid is less than 3% by weight, the foaming properties of the soap composition cannot be sufficiently improved. On the other hand, when its content exceeds 20% by weight, the hardness of the soap composition is weakened to lower its moldability.

Additionally, the soap compositions of the present invention contain water. The water content is 5-20% by weight, preferably 8-15% by weight. When the water content is less than 5% by weight, the soap composition can exhibit an undesirably harsh texture when used with cold water. In the above case, the solubility and foaming properties of the soap composition are also reduced. On the other hand, when the water content exceeds 20% by weight, the hardness of the soap composition is weakened to lower its moldability.

In addition to the above-mentioned components, the soap composition of the present invention may, if desired, contain additives generally used in skin cleansers. Examples of the above additives include humectants such as propylene glycol or glycerin, oils such as higher alcohols, fatty acid esters and silicones, fragrances, colorants, UV absorbers, antioxidants, chelating agents such as organic acids, fungicides and preservatives.

The soap compositions of the present invention may also contain diethylenetriaminepentaacetic acid and 1-hydroxyethane-1,1-diphosphonic acid in admixture as stabilizers.

Used diethylenetriaminepentaacetic acid (hereinafter referred to as DTPA) is represented by the following structural formula (1):

The sodium and potassium salts thereof are preferred examples of alkali metal salts of DTPA.

In the present invention, DTPA or alkali metal salts thereof may be used either alone or in combination. Its content can be appropriately determined depending on, for example, the form of the soap composition and the content of unsaturated fatty acid therein. For the production of solid soap compositions, for example, DTPA or its alkali metal salt is contained in an amount of usually 0.01-5% by weight, preferably 0.1-2% by weight. For the production of pasty soap compositions, its content is usually 0.01-3% by weight, preferably 0.1-1% by weight. For the production of liquid soap compositions, its content is usually 0.01-2% by weight, preferably 0.1-1% by weight.

The 1-hydroxyethane-1,1-diphosphonic acid (hereinafter abbreviated as HEDP) used is represented by the following structural formula (2).

The sodium and potassium salts thereof are preferred examples of alkali metal salts of HEDP.

In the present invention, HEDP or alkali metal salts thereof may be used either alone or in combination. The content thereof can be appropriately determined depending on, for example, the form of the soap composition and the content of unsaturated fatty acid therein. For producing a solid soap composition, for example, HEDP or an alkali metal salt thereof is usually contained in an amount of 0.01-5% by weight, preferably 0.1-2% by weight. For the production of pasty soap compositions, its content is usually 0.01-3% by weight, preferably 0.1-1% by weight. For the production of liquid soap compositions, its content is usually 0.01-2% by weight, preferably 0.1-1% by weight.

The soap compositions of the present invention can be produced in several ways. For example, it can be obtained by kneading fatty acid soap, higher fatty acid and water together with other additives arbitrarily. Typically, the knead (pure soap) is compression molded to obtain a normal solid soap suitable for use.

The soap base composition of the present invention is prepared by mixing raw fatty acids, ie fatty acids derived from palm kernel oil and fatty acids derived from palm stearin, in a specific ratio, followed by neutralization with alkali.

The soap composition of the present invention has good foaming properties, hardly deforms under soaking, and can be produced inexpensively.

In order to further illustrate the present invention in more detail, the following examples are given.

Embodiment 1-6 and comparative example 1-6

The components listed in Tables 2 and 3 were kneaded together and molded in a conventional manner to obtain a solid soap. Table 1 lists the fatty acid compositions of palm kernel oil-derived fatty acid sodium salts and palm stearin-derived fatty acid sodium salts used in these Examples and Comparative Examples.

Each of the soaps thus obtained was evaluated by performing a "foaming" test and a "deformation" test by the following methods. Table 2 summarizes the results. "Blistering" test

10 panelists (5 women and 5 men) were bathed and their bodies were washed with each soap once a day for a week. Blistering was then evaluated according to the following criteria. Criteria for evaluating "bubbling": grade situation

◎: Good foaming

○: Blistering

△: Slightly foaming

×: less foaming "deformation due to immersion" test

10 panelists (5 women and 5 men) were bathed and their bodies were washed with each soap once a day for a week. Then, deformation due to immersion in soap was evaluated according to the following criteria.

Criteria for evaluating "deformation due to immersion": Grade Situation

◎: No deformation at all.

○: Almost no deformation.

△: A little deformed.

×: Severely deformed.

Table 1 (expressed in weight percent)

Fatty Acid Sodium Salts of Fatty Acid Sodium Salts Derived from Palm Stearin Fatty Acid Compositions Derived from Palm Kernel Oil Caprylic (C8) - 3 Capric (C10) - 3 Lauric (C12) 1 54 Myristic (C14) 2 16 Palmitic acid (C16) 60 8

(C16F1)--Cardic acid (C18) 5 2 oleic acid (C18F1) 27 12 linoleic acid (C18F2) 5 2

Table 2

(expressed in weight percentage)

Example

1 2 3 4 5 6 (composition) A: 31.8 39.7 47.6 40.95 37.7 36.2 sodium fatty acid sodium salt derived from palm kernel oil B: Derivatively derived from palm dysfunction 47.6 39.7 31.8 40.95 37.7 36.2 sodium fatty acid salt : B) 4: 5: 5: 5: 4: 5: 5: 5: 5: 5 water 11--15 7.5 7.5--7.5 18 fatty acids 月 月 月1.-----------------two-ethylene tiosamine five-0.1-------. ◎ ◎ ◎Deformation ◎ ◎ ◎ ◎ ◎ ◎ ○

table 3

  (expressed in weight percent)

Comparative example

1 2 3 4 5 6 (composition) A: 15.9 30.95 30.2 60 41.25-sodium fatty acid salt B: Palm hard fat precursor 63.95 30.2 15 41.25-sodium fatty acid salt (weight ratio A: A: B) 2: 8: 5: 5: 5: 2 5: 5 5: 5 coconut oil fatty acid sodium salt----37.5 Palm oil fatty acid sodium salt-----37.5 water 11-30 15--the palm kernel oil Derived 7.5 25 7.5-7.5 fatty acid Motentic acid-----spice 1.2--------------two-ethylene triaine 5.1-----sodium hydroxyxyne alumane Two 膦 acid 0.5----- (evaluation) Foam △ ◎ △ △ ◎ ◎ △ △ △ ○ △ △ △ ○ △

As shown in Table 2, each of the soaps in Examples 1-6 showed excellent properties, ie, good lather and little deformation when soaked.

On the other hand, as shown in Table 3, the soap of Comparative Example 1 contained the sodium salt of fatty acid derived from palm stearin in such an amount that the fatty acid salt derived from palm kernel oil was mixed with the fat derived from palm stearin. If the ratio of acid salt exceeds 3:7, the soap will have poor foaming properties. On the contrary, the soap of Comparative Example 4, containing the sodium salt of fatty acid derived from palm stearin in such an amount that the ratio of fatty acid salt derived from palm kernel oil to fatty acid salt derived from palm stearin is lower than 7: 3. The soap is easily deformed due to soaking. The soap of Comparative Example 2, containing more than 20% by weight of fatty acid derived from palm kernel oil, was easily deformed by soaking. In addition, the soap of Comparative Example 3 contained more than 20% by weight of water, and the soap was easily deformed by soaking. The soap of Comparative Example 5 does not contain a higher fatty acid, and the soap is poor in foaming properties. The soap of Comparative Example 6, containing commonly used coconut oil fatty acid salt and palm oil fatty acid salt instead of fatty acid salt derived from palm kernel oil and fatty acid salt derived from palm stearin, the soap is easily deformed due to soaking .

The soap composition of the present invention hardly softens or deforms due to immersion in use, but has good foaming properties. In addition, the soap composition of the present invention can be produced with inexpensive materials.

While the present invention has been described in detail and specific embodiments thereof referred to, it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.

Claims (6)

1. soap composition, the weight ratio that contains that comprises 60-92% (weight) is 7: 3-3: 7 by the soap of palm kernel oil-derivation with by the fatty acid soaps of palm stearines derived fatty acid salt, the water of the higher fatty acid of 3-20% (weight) and 5-20% (weight) with 8-22 carbon atom.

2. according to the soap composition of claim 1, wherein said higher fatty acid is the lipid acid by palm kernel oil-derivation.

3. according to the soap composition of claim 1, wherein comprise the lauric acid of the 50-60% (weight) as lipid acid, the oleic acid of the tetradecanoic acid of 10-20% (weight) and 8-15% (weight) by the lipid acid of palm kernel oil-derivation thing.

4. according to the soap composition of claim 1, wherein comprise the palmitinic acid of the 50-70% (weight) as lipid acid, the oleic acid of the stearic acid of 3-8% (weight) and 25-35% (weight) by palm stearines derived fatty acid salt.

5. according to each soap composition among the claim 1-4, wherein also contain diethylene triaminepentaacetic acid(DTPA) or its an alkali metal salt and 1-hydroxyl ethane-1,1-diphosphine or its an alkali metal salt.

6. a content ratio that comprises 60-92% (weight) is 7: 3-3: 7 by the soap of palm kernel oil-derivation with by the preparation method of the soap composition of the higher fatty acid of the fatty acid soaps of palm stearines derived fatty acid salt, 3-20% (weight) and 5-20% (weight) water with 8-22 carbon atom, comprise step:

Fatty acid soaps, higher fatty acid and water are at random integrated with other additives, should integrate thing mould compression molding then.