JP2740355B2 - Bar-shaped synthetic detergent and its production - Google Patents

Description

Description: The present invention relates to a bar-shaped synthetic detergent and a bar-formable detergent composition.

The bar detergents can be classified into three types: bar soaps, mixed active bar detergents having a considerably high soap content, and bar synthetic detergents having a small or no soap content.

Commonly used bar soaps have a high content of fatty acid soaps, typically occupying 60-80% by weight. Fatty acid soaps are used to balance soluble and insoluble soaps, but they also provide the functional properties required by foaming and rod-like structures. Commonly used bar soaps are produced by milling, extruding, and stamping a semi-solid mass of soap and other ingredients.

As a bar detergent, a detergent containing a mixture of soap and a synthetic detergent is known. Although soap contains less than synthetic detergents, it plays an important role as an ingredient in bar detergents. In such a bar-like detergent, the content of the soap, particularly the content of the insoluble soap, plays a large role in the structure and the physical properties, similarly to the generally used bar-like soap.

The third category of bar detergents is often known as bar "Syndet", but has zero or low soap content and most or all of the active detergent is non-soap. It is a synthetic detergent. Generally, such bar detergents are rich in non-detergent materials that function to provide a bar structure. Such "structuring agents"
Are usually water-insoluble and include substances such as starch and kaolin. The bar detergent often also contains a plasticizer, and as the plasticizer, stearic acid and cetyl alcohol are known. PCT Patent No. 92/13060 discloses a bar-like synthetic detergent comprising a long chain alkyl sulphate, water and a ternary plasticizer containing free fatty acids, monoglycerides and polyethylene glycol. Bar detergents containing polyethylene glycol are disclosed in U.S. Pat.
Also known from No. 5 and No. 2974884. U.S. Patent No. 3687
No. 855 discloses a bactericidal bar detergent containing iodine, wherein polyethylene glycol serves to evenly distribute the active germicidal compound and the detergent in the bar detergent. In U.S. Pat. No. 2,987,484, polyethylene glycol is described as a filler in bar detergents made by a closed die molding process using a molten mixture of active ingredients.

As a surfactant for the synthetic detergent bar, primary alkyl sulfates, alkyl ether sulfates, betaines, sarcosinates, sulfosuccinates, isethionates and the like are known. Conventionally, such a bar-shaped detergent having a soap content of zero or a small amount is obtained by adding a structurant, a plasticizer, and a surfactant, i.e., soluble and insoluble components, to a final rough texture using a high-shear mixer. It is made by a high energy operation that involves vigorous physical mixing until it runs out. The mixture is then formed into a "synthetic detergent".

This conventional method has several disadvantages in that the physical mixing is performed in a batch mode and that a high energy mixer is required.

The present invention uses a new composition to produce a bar-type synthetic detergent without the conventional high energy operation steps.

Unlike the compositions and methods in the prior art, in the present invention the components used are melted at a temperature which is easily obtained but higher than the normal use temperature of the bar "synthetic detergent", so that the complete The essential task of producing a bar detergent called mixing is achieved by simply mixing the liquid composition,
High energy work is not required to thoroughly mix the solid mixture.

As described above, the present invention provides a bar-shaped synthetic detergent or a detergent composition moldable into a bar-shaped synthetic detergent, the composition comprising: (a) 10 to 60% by weight of a non-soap-based synthetic detergent; And a water-soluble structurant 1 having a melting point in the range of 40 to 100 ° C.
0 to 60% by weight, (c) 5 to 50% by weight of a water-insoluble structuring agent having a melting point of 40 to 100 ° C, which does not correspond to any of soap and non-soap detergents, and %including.

Non-soap synthetic detergent having a melting point exceeding 100 ° C. (a)
Other substances, the content of which is
Desirably less than 20% by weight.

In many embodiments of the present invention, the content of the detergent (a) is in the range of 10 to 50% by weight. It is desirable to contain from 3% to 5% to 20%, preferably less than 15%, by weight of the composition of water.

From the above, it can be seen that an important component of the composition according to the invention is a water-soluble substance having a melting point in the range of 40 to 100 ° C. and serving as a rod-shaped structuring agent. With this substance,
The desired properties are obtained, in particular that the bar detergent is a robust solid.

From the above, a substance that does not melt at a temperature lower than 100 ° C. can be present in the bar-shaped detergent composition.
Such substances also act as structuring agents. Such a substance is not essential and may not be present at all. If such a substance is present, the composition after melting will not be completely liquid at temperatures up to 100 ° C., unless the unmelted substance is dissolved in another substance present at the same time. It has been found that the unmelted substance, if in an appropriate amount, can be dispersed in the molten composition while the molten composition is a sufficiently stirrable liquid without the need for high energy operations. Again, such materials that disperse but do not melt are at least some of the non-soap based detergents (a) and / or materials that do not fall into this category.

Suitable synthetic detergents (a) are alkyl ether sulfates,
Alkyl ethoxylate, alkyl glyceryl ether sulfate, alpha olefin sulfonate, acyl tauride, methyl acyl taurate, N-acyl glutamate, acyl isethionate, anionic acyl sarcosinate, alkyl phosphate, methyl glycolose ester , Protein condensate, ethoxylated alkyl sulfate,
Alkyl polyglucoside, alkyl amine oxide,
Betaine, sultin, alkylsulfosuccinate, dialkylsulfosuccinate, acyllactylates, and mixtures thereof. The above detergents are C ₈ -C _24, it is preferable and more preferably those based on alkyl and acyl groups of C ₁₀ -C _16.

In many embodiments of the present invention, the amount of the detergent (a) can be in the range of 10-50% by weight. 20-40
% Is more preferable.

Among the above synthetic detergents, some of them, particularly acyl isethionates, have poor water solubility as compared with other substances. When using a detergent with low solubility, it is preferable to mix it with another synthetic detergent. Therefore, in the detergent composition of the present invention, the acyl isethionate may be excluded from the synthetic detergent (a), or may be used in combination with another synthetic detergent. In some embodiments of the present invention, the acyl isethionate comprises 10% by weight of the composition.
Hereinafter, for example, it is 5 to 9.5% by weight. However, in another embodiment of the invention, the acylisethionate is present in higher amounts, for example up to 30% by weight of the composition.

The water-soluble structurant (b) must be melted in the temperature range of 40 to 100 ° C. so that it melts when forming the rod-shaped composition and becomes solid at the operating temperature of the rod-shaped detergent. It is. It is desirable to have a melting point in the narrow range of at least 50 ° C, especially 50-90 ° C.

Substances which can be considered as water-soluble structurants (b) are polyalkylene oxides having a suitable melting point and medium molecular weight, in particular polyethylene glycol or mixtures thereof.

The polyethylene glycol (PEG) used has a molecular weight of 150
It is in the range of 0 to 10,000. However, in some embodiments of the present invention, it is preferred to have a fairly small amount of polyethylene glycol in the molecular weight range of 50,000 to 500,000, especially around 100,000. Such polyethylene glycols have been found to improve the attrition rate of bar detergents. It is thought that the reason is that such a rod-shaped composition remains entangled with a long polymer chain even when wet during use.

Such high molecular weight polyethylene glycol (or other water soluble high molecular weight polyethylene oxide)
When used, amounts of 1 to 5% by weight of the composition are preferred, with 1% to 1.5 to 4% to 4.5% being even more preferred. These materials generally have, for example, the molecular weights described above.
It is used in combination with a larger amount of another water-soluble structurant (b), such as 1500 to 10,000 polyethylene glycol.

Certain polyethylene oxide and polypropylene oxide block copolymers that melt in the required temperature range of 40-100 ° C. can be used as part or all of the water-soluble structurant (b). In this case, a block copolymer containing at least 40% by weight of polyethylene oxide is preferred. Such block copolymers can be used in admixture with polyethylene glycol or other water-soluble structurants.

The total amount of the water-soluble structurant (b) is preferably 20 to 50% by weight of the composition.

The water-insoluble structurant (c) also needs to have a melting point in the range of 40 to 100 ° C, preferably at least 50 ° C, particularly preferably in the range of 50 to 90 ° C. Particularly suitable suitable substances are fatty acids, especially carbon atoms
It has 12 to 24 carbon chains. For example, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid and mixtures thereof. Sources of these fatty acids are coconut, pruned coconut, palm, coconut, babassu and tallow fatty acids, partially or fully hardened or distilled fatty acids. Suitable water-insoluble structurants include, in addition,
There are alkanols having 8 to 20 carbon atoms, especially cetyl alcohol. The water solubility of these substances is generally 5 g at 20 ° C.
less than / l.

The relative ratio of the water-soluble structurant (b) to the water-insoluble structurant (c) determines the rate of wear of the bar detergent during use. The presence of a water-insoluble structurant tends to make the bar detergent less soluble when exposed to water during use, thus slowing down the attrition rate.

Preferably, the total amount of component (c) is from 10 to 40% by weight of the composition.

Water-insoluble substances with melting points above 100 ° C. can also serve as additional structurants for bar detergents. If a water-insoluble substance with a melting point above 100 ° C. is present, its content must be less than 20% by weight of the composition.

When the water-insoluble structurant (c) having a melting point of 100 ° C. or more is present, it is preferable to select from a plant substance or a mineral. As a plant material, starch including corn starch is preferable, and as a mineral, kaolin, calcite, or the like is preferable. The ratio of water-soluble structurant (b) to the total amount of water-insoluble structurant will be in the range from 2: 3 or 1: 1 to 3: 1 or 5: 1.

Certain soaps, whose chains are 8 to 22 carbon atoms long
Individual monocarboxylic acid fatty acid salts can be included in the bar detergent composition of the present invention. Its amount is 10% of the composition
Preferably it does not exceed weight%.

The inventors have discovered that the inclusion of a water-insoluble soap slows down the attrition rate of the bar detergent. Such water-insoluble soaps are saturated fatty acid salts having a chain length of 16 to 22, especially 16 to 18, carbon atoms. Preferably, such salts are sodium salts. They also have a melting point of 100 ° C
Therefore, it is classified into the category (e) of a substance which is not a synthetic detergent having a melting point of more than 100 ° C.

If a water-insoluble soap is present in the composition, its amount should not exceed 10% by weight of the composition, for example in the range from 3 to 9.5% by weight. More preferably, it is in the range of 5 to 9% by weight.

In any case, it is preferable to include a combination of polyethylene glycol having a molecular weight of 50,000 to 500,000 as at least a part of the soluble structuring agent (b) and a water-soluble soap as at least a part of the insoluble substance (c). The use of these materials in combination has been found to improve the abrasion rate of the bar detergent and provide a better feel during use.

When a combination of such materials is used, the amount may vary from 4 to 9.5% by weight of the composition, the molecular weight of 50,
000-500,000 polyethylene glycol is 1.5% of the composition
Preferably it is ~ 4.5% by weight.

Substances having a melting point of less than 100 ° C. that can be included in the composition are classified as follows.

Non-soap synthetic detergents that do not become completely liquid below 100 ° C, such as acyl isethionates, soaps that do not melt below 100 ° C, especially water-insoluble soaps, and other water-insoluble substances that do not melt below 100 ° C.

It is preferable that there is no substance other than the synthetic detergent that is soluble in water but does not melt below 100 ° C.
If present, less than 10%, preferably less than 5% by weight of the composition is preferred.

The total amount of substances belonging to the second and third categories (ie, substances other than non-soap based synthetic detergents) is 20% of the composition.
% By weight or less is desirable. The total amount of substances that do not melt below 100 ° C. should not exceed 50% by weight of the composition, preferably less than 40% by weight, 30% by weight or less, more preferably 20% by weight. It must not be so large that it cannot be done.

The bar detergent composition of the present invention usually contains water, but the amount is considerably smaller than that of the bar detergent. As the amount of water increases, the hardness of the bar detergent decreases. The amount of water does not exceed 15% by weight of the bar detergent, for example from 3 to 5% by weight to 1%.
It is preferably in the range of 4.9% by weight.

The bar detergent of the present invention is a so-called benefit additive (be
Nefit agents (a substance delivered in relatively small amounts that exhibits some beneficial function in addition to the cleansing action that is the basic function of the bar detergent) can optionally be included. Examples of such additives include emollients such as fatty alcohols and vegetable oils, essential oils, skin conditioning agents including waxes, phospholipids, lanolin, etc., antibacterial agents, bactericides as well as opacifiers, pearlescent agents, electrolytes Fragrances, sunscreens, fluorescents, colorants and the like. Preferably, the skin conditioning agent comprises silicone oil, mineral oil or glycerol or a combination thereof.

According to another aspect of the present invention, there is provided a method for producing a bar-like synthetic detergent, comprising: (i) a non-soap-based synthetic detergent, a structurant, and water (optional component); A mixture containing less than 20% by weight of a substance that does not melt into a liquid except in a detergent,
Preparing at a temperature of 100 ° C., more preferably 50-90 ° C .; (ii) cooling to a temperature at which the product of step (i) solidifies; and (iii) rod-shaped the product of step (i). Shaping into a detergent.

The liquid mixture indicates a single-phase system or a multi-phase system. A single phase is an isotropic mixture and a multiphase consists of an emulsion or a liquid crystal dispersion. The mixture can be prepared by heating the mixture until it is in a molten state after mixing the components and further mixing, or by heating and mixing the components.

Step (i) can be performed in a stirred heated vessel.

In a composition containing a fatty acid or a mixture of a soap and a fatty acid and containing a polyalkylene oxide, it is useful to start by melting the fatty acid in a heating vessel equipped with a stirrer. Next, the stirring device is moved to add the polyalkylene oxide. At that stage, the soap is produced in situ by partial neutralization of the fatty acids.

Next, a non-soap detergent is added. Finally, 50% solids
A macroscopically homogeneous molten mixture is obtained which is present in less than one.

Step (ii) is preferably performed on a cooled scrap roller. This roller may be incorporated in a cooled mill.

Minor components and benefit additives are added at this stage between steps (ii) and (iii).

Step (iii) can include a step of mixing, extruding, stamping, or, optionally, mixing and pressing to form a rod.

In another embodiment of the present invention, the liquid mixture obtained in step (i) is poured into a frame. In this pouring step, what was formed into a log shape may be further processed into a rod shape, or may be directly formed into a rod shape. Step (ii) if a rod product is obtained by pouring
The steps (iii) and (iii) are one step, and the obtained bar-like detergent may be packaged in a mold, or the product taken out of the frame may be re-packaged.

In order to better understand the present invention, an explanation will be given below using examples.

Example 1 The components listed in Table 1 below were melted together at 80 ° C. to produce a product consisting primarily of a liquid phase. All amounts are given in% by weight. Immediately after cooling to room temperature, a solid, generally cubic, bar detergent was formed from compositions (A) and (B) using a single bar press. A bar detergent was formed from the same composition by a step of pouring from a hot melt.

The bar-like detergents formed by melt-pouring and pressing all had satisfactory properties as bar-like "synthetic detergents".

Example 2 The materials listed in Table 2 below were melted together at 80 ° C. to produce a pumpable, stirrable liquid product. The liquid melt was poured into a rod-shaped frame and cooled to form a rod-like solid. That is, a bar-like detergent was formed by pouring from the melt. A satisfactory bar detergent was obtained.

Example 3 The materials listed in Table 3 below were melted together at 80 ° C. to produce a pumpable, stirrable liquid product. All amounts are expressed in weight%. The liquid melt was cast into a rod shape in the same manner as in Example 2.

A certain amount of each melt was taken and processed into a bar detergent by different routes. The melt was cooled through a cooled 3-roll mill. Small amounts of fragrances, opacifiers and fluorescents were added in less than 2% by weight of the total composition. After the composition thus obtained was mixed again, it was passed through a vacuum extruder and finally stamped into the desired rod shape using a manual press.

A satisfactory bar detergent was obtained by any of the processing routes.

Example 4 A bar detergent was prepared from the components shown in Table 4 below by the method of Example 2. All amounts are expressed in weight%. These bar detergents contained a mixture of two active solubilizers.

Example 5 A bar detergent was prepared from the substances listed in Table 5 below by the method of Example 2. All amounts are expressed in weight%. In these bar detergents, the water-soluble structurant is polyethylene glycol and a mixture of block copolymers of polyethylene oxide and polypropylene oxide (from BASF, Germany).
Pluronic F87).

Example 6 The materials listed in Table 6 below were melted together at 80 ° C. All amounts are expressed in weight%.

First, PEG4000 and stearic acid were heated and melted. When these melted, a small amount of sodium hydroxide was added to neutralize a small amount of stearic acid to obtain sodium stearate. Next, the remaining material was added and stirred to produce a pumpable and uniform liquid.

Each melt was cooled through a cooled three roll mill.
Next, 1% of fragrance and 0.3% of titanium dioxide as opacifier
Was added, and the resulting composition was mixed and extruded, and then stamped using a manual press to obtain a desired bar detergent.

Example 7 The materials listed in Table 7 below were prepared according to the method of Example 3, ie,
After the melt was cooled on a mill, it was extruded, punched out and made into a bar-like detergent to form a bar-like detergent. All amounts are% by weight
Expressed by These detergents contain a mixture of three active solubilizers.

Compositions 7C and 7F were too soft to process, while the remaining compositions could be processed into hard bar detergents.

Example 8 For some of the compositions described in the preceding examples, Zein described by Gotte in the 4th International Conference on Surfactants (Brussels, 1964), No. 3, p. 89-90. A test was used to evaluate its softness. This test measures the amount of amino acids eluted from zein under specified conditions. The eluted material is measured by nitrogen quantification. The results are shown below.

The bar soap of the present invention has a small value of the amount of zein eluted, indicating that it is very excellent in softness.

Continuation of the front page (56) References US Patent 3,687,855 (US, A) US Patent 2,987,484 (US, A)

Claims (10)

(57) [Claims] (1) 10 to 60% by weight of a non-soap-based synthetic detergent (b) 20 to 50% of a water-soluble substance having a melting point in the range of 40 to 100 ° C. which is not applicable to any of soap and non-soap-based detergent (C) 5 to 50% by weight of a water-insoluble substance having a melting point in the range of 40 to 100 ° C., which does not correspond to any of soaps and non-soap detergents, and (d) 0 to 20% by weight of water. A detergent composition comprising: component (b) comprising polyethylene glycol or a mixture thereof. 2. The detergent composition according to claim 1, wherein the amount of the component (a) is 10 to 50% by weight. 3. The detergent composition according to claim 1, wherein the amount of water is 5 to 14.9% by weight. 4. The composition according to claim 1, wherein the content of a substance which does not liquefy at a temperature lower than 100 ° C. other than the non-soap synthetic detergent is less than 20% by weight of the composition. A detergent composition according to any one of the preceding claims. 5. The method according to claim 1, wherein each polyethylene glycol is from 1,500 to 10,000.
Detergent composition according to any one of claims 1 to 4, characterized in that it has a molecular weight in the range of 0. 6. The method according to claim 1, wherein each polyethylene glycol is 50,000 to 500,
A detergent composition according to any of claims 1 to 5, having a molecular weight in the range of 000 and containing from 1 to 4.5% by weight of the composition in total. 7. Component (c) is lauric acid, myristic acid,
The detergent composition according to any one of claims 1 to 6, wherein the detergent composition is selected from palmitic acid, stearic acid, arachidic acid, behenic acid, and a mixture thereof. 8. A detergent composition according to any one of claims 1 to 7, wherein the detergent composition comprises 3 to 10% by weight of the composition. 9. The detergent composition according to claim 1, wherein the detergent composition has a rod shape. 10. A method for producing a bar-shaped synthetic detergent, comprising: (i) (a) 10 to 60% by weight of a non-soap-based synthetic detergent;
Not applicable to soap and non-soap detergent, melting point 40
(C) 10 to 60% by weight of a water-soluble substance in the range of ~ 100 ° C;
5 to 50% by weight of a water-insoluble substance having a melting point in the range of 40 to 100 ° C., which does not correspond to any of soap and non-soap detergent;
(D) preparing a liquid mixture comprising 0 to 20% by weight of water; (ii) cooling to a temperature at which the product of step (i) solidifies; (iii) rod-shaped the product of step (i). Wherein the component (b) comprises polyethylene glycol or a mixture thereof.