JP5525859B2 - Solid cleaning composition - Google Patents

Description

  The present invention relates to improvement in transparency and foam quality of a solid cleaning composition, particularly a composition mainly composed of fatty acid soap.

The transparent solid cleaning composition gives a high-class feeling and has a high commercial value, so that it is used particularly for a facial soap.
By the way, the conventional transparent solid cleaning composition uses fatty acid soap as a base, uses saccharides such as sucrose, glycerin, sorbitol, propylene glycol or polyols as a clarifying agent, and uses a frame bending method or a mechanical bending method. It is customary to manufacture.

  The structural mechanism of transparency of the transparent solid cleaning composition produced in this way is mainly the fibrous microcrystal group of the opaque solid cleaning composition having an optically discontinuous size with respect to visible light. It is considered that the solid cleaning composition is made transparent by being divided in a direction perpendicular to the fiber axis and being refined below the wavelength of visible light.

  However, the transparent solid cleaning composition obtained by such a clearing mechanism is still insufficient in transparency, lacks creamy foam, and is particularly improved as a soap for facial cleansing where the feeling of use is important. There was room left.

JP 2002-256296 A JP-A-7-62388

  This invention is made | formed in view of the said prior art, The subject which should be solved is improving the transparency and foam quality in a fatty-acid soap-type solid cleaning composition.

As a result of studying a surfactant coexisting with a fatty acid soap, the present inventors have attempted to improve transparency and foam quality by using a specific amphoteric surfactant and a phytosterol surfactant together with a fatty acid soap. As a result, the present invention has been completed.
That is, the solid cleaning composition mainly comprising the fatty acid soap according to the present invention is
It contains polyoxyalkylene phytosterol.
(Here, the polyoxyalkylene group is composed of 20 to 35 mol of ethylene oxide residue and 0 to 10 mol of propylene oxide residue).

Hereinafter, the configuration of the present invention will be described in detail.
[Fatty acid soap]
The fatty acid in the fatty acid sodium or the mixed salt of sodium / potassium fatty acid used in the solid cleaning composition of the present invention is preferably saturated or unsaturated having 8 to 20 carbon atoms, more preferably 12 to 18 carbon atoms. These fatty acids may be linear or branched. Specific examples include, for example, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, isostearic acid and the like, and beef tallow fatty acid, coconut oil fatty acid, palm kernel oil fatty acid and the like which are mixtures thereof.

  Specific examples of the fatty acid sodium include sodium laurate, sodium myristate, sodium palmitate, sodium stearate, sodium oleate, sodium isostearate, beef tallow fatty acid sodium, coconut oil fatty acid sodium, palm kernel oil fatty acid sodium and the like. These may be used alone or in combination of two or more. Among the above fatty acid sodium, sodium laurate, sodium myristate, sodium palmitate, sodium stearate, sodium oleate, and sodium isostearate can be suitably used.

  Specific examples of sodium / potassium mixed salts of fatty acids include sodium / potassium laurate, sodium / potassium myristate, sodium / potassium palmitate, sodium / potassium stearate, sodium / potassium oleate, sodium / potassium isostearate, Examples include beef tallow fatty acid sodium / potassium, coconut oil fatty acid sodium / potassium, and palm kernel oil fatty acid sodium / potassium. These may be used alone or in combination of two or more. Among the sodium / potassium mixed salts of the above fatty acids, sodium / potassium laurate, sodium / potassium myristate, sodium / potassium palmitate, sodium / potassium stearate, sodium / potassium oleate, and sodium / potassium isostearate are preferred. Can be used for

  The content of the fatty acid sodium or the sodium / potassium mixed salt of fatty acid in the solid cleaning composition of the present invention is preferably 20 to 60% by mass, particularly preferably 25 to 35% by mass. When this content is less than 20% by mass, the freezing point is lowered, and therefore, when stored for a long period of time, the surface may melt and the commercial value may be impaired. On the other hand, if it exceeds 60% by mass, the transparency may be lowered, or a feeling of tension may occur after use.

  Further, in the mixed salt of fatty acid sodium / potassium, the molar ratio of sodium and potassium constituting the salt (sodium / potassium ratio) is 10/0 (that is, fatty acid sodium) to 7/3, particularly 9 / It is preferable that it is 1-8 / 2. If the sodium / potassium ratio exceeds 7/3 and the proportion of potassium increases, the freezing point becomes low. Therefore, when stored for a long period of time, the surface may melt and the commercial value may be impaired. Moreover, there is a possibility that the hardness decreases, the dissolution during use increases, the sweating occurs under high temperature and high humidity conditions, or the surface becomes clouded during use.

[Polyoxyalkylene phytosterol]
In the polyoxyalkylene phytosterol preferably used in the present invention, the polyoxyalkylene group contains 20 to 35 mol of ethylene oxide residue and 0 to 10 mol of propylene oxide residue.
The origin of the phytosterol residue is not particularly limited, but is preferably soybean.

Particularly preferred are (POE) 30 phytosterol, (POE) 30 (POP) 7 phytosterol, and the like.
As for the compounding quantity of polyoxyalkylene phytosterol, 1.0-13.0 mass% is preferable. If it is less than 1.0% by mass, the effect of improving the transparency and foam quality is not sufficient, and if it exceeds 13.0% by mass, the frictional solubility increases and the dissolution tends to increase.

[Amphoteric surfactant]
The solid cleaning composition according to the present invention preferably contains the following amphoteric surfactants in order to further improve the transparency, the feeling of use and the foaming property.

Examples of the amphoteric surfactant that can be used in the solid cleaning composition of the present invention include amphoteric surfactants represented by the following chemical formulas (A) to (C).

[Wherein, R ₁ represents an alkyl group or alkenyl group having 7 to 21 carbon atoms, n and m are the same or different and represent an integer of 1 to 3, and Z represents a hydrogen atom or (CH ₂ ) _p COOY (where p is an integer of 1 to 3, and Y is an alkali metal ion , an alkaline earth metal ion, or an organic amine cation ). ],

[Wherein R ₂ represents an alkyl group or alkenyl group having 7 to 21 carbon atoms, R ₃ and R ₄ are the same or different and represent a lower alkyl group, and A represents a lower alkylene group. . ],and

[Wherein, R ₅ represents an alkyl group or alkenyl group having 8 to 22 carbon atoms, and R ₆ and R ₇ are the same or different and represent a lower alkyl group. ].

In the chemical formula (A), the “alkyl group having 7 to 21 carbon atoms” of R ₁ may be linear or branched, and the number of carbon atoms is preferably 7 to 17. The “alkenyl group having 7 to 21 carbon atoms” of R ₁ may be linear or branched, and the number of carbon atoms is preferably 7 to 17. Examples of the “alkali metal” of Y include sodium and potassium, examples of the “alkaline earth metal” include calcium and magnesium, and examples of the “organic amine” include monoethanolamine, diethanolamine and trimethylamine. Examples include ethanolamine.

Specific examples of the amphoteric surfactant represented by the chemical formula (A) include imidazolinium betaine type, for example, 2-undecyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine (synthesized from lauric acid) Hereinafter, for convenience, it is also referred to as “lauroiylimidazolinium betaine”), 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine (synthesized from stearic acid), 2-synthesized from coconut oil fatty acid. Alkyl or alkenyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine (R ₁ is a mixture of C _{7 to} C ₁₇ , hereinafter, also referred to as “cocoyl imidazolinium betaine” for convenience) and the like.

In formula (B), and "alkenyl group having a carbon number of 7 to 21""alkyl group having a carbon number of 7 to 21" of R ₂ is the same as R ₁ of formula (A). The “lower alkyl group” for R ₃ and R ₄ is a linear or branched alkyl group having preferably 1 to 3 carbon atoms. Furthermore, the “lower alkylene group” of A is a linear or branched alkylene group having preferably 3 to 5 carbon atoms.

Specific examples of the amphoteric surfactant (amide alkyl betaine type) represented by the chemical formula (B) include amidopropyl betaine type, for example, coconut oil fatty acid amidopropyldimethylaminoacetic acid betaine (R ₂ is C _{7 to} C ₁₇ . Mixture).

In the chemical formula (C), the “alkyl group having 8 to 22 carbon atoms” of R ₅ may be linear or branched, and the number of carbon atoms is preferably 8 to 18. The “alkenyl group having 8 to 22 carbon atoms” of R ₅ may be linear or branched, and the number of carbon atoms is preferably 8 to 18. Furthermore, the “lower alkyl group” of R ₆ and R ₇ is the same as R ₃ and R _{4 in} the chemical formula (B).

Specific examples of the amphoteric surface active agents represented by the chemical formula (C) (alkyl betaine type), lauryl betaine, synthesized from coconut fatty alkyl or alkenyl acid betaine (R ₅ is C ₈ ~ C ₁₈ mixture).

  In the present invention, at least one selected from the group consisting of amphoteric surfactants represented by the above chemical formulas (A) to (C) is used. When a plurality of amphoteric surfactants represented by the chemical formula (A) are used, a plurality of amphoteric surfactants represented by the chemical formula (B) may be used. A plurality of amphoteric surfactants represented by

  Among the amphoteric surfactants described above, imidazolinium betaine type, particularly cocoylimidazolinium betaine, among the amphoteric surfactants represented by the chemical formula (A) is particularly preferably used.

  In the solid cleaning composition of the present invention, by blending the amphoteric surfactant described above, the fatty acid soap (fatty acid sodium or a mixed salt of fatty acid sodium / potassium) and the amphoteric surfactant form a complex salt, which is transparent. The effect of improving the property and improving the hardness and decreasing the degree of dissolution is exhibited.

The content of the amphoteric surfactant in the solid cleaning composition of the present invention is preferably 2 to 10% by mass, particularly 4 to 8% by mass. If this content is less than 2% by mass, the freezing point will be low, and if stored for a long period of time, the surface will melt and the commercial value may be impaired. Moreover, there exists a possibility that hardness may fall or the melt-down at the time of use may become large. Further, the transparency may be lowered. On the other hand, if it exceeds 10% by mass, a sticky feeling is produced after use, and if stored for a long period of time, the surface may be browned and the commercial value may be impaired.
[Nonionic surfactant]

  The solid cleaning composition of the present invention may further contain a nonionic surfactant. Nonionic surfactants that can be used include polyoxyethylene (hereinafter also referred to as POE) hydrogenated castor oil, polyoxyethylene 2-octyldodecyl ether, polyoxyethylene lauryl ether, propylene oxide ethylene oxide copolymer block polymer, polyoxyethylene Polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene glycol, polyethylene glycol diisostearate, alkyl glucoside, polyoxyethylene-modified silicon (for example, polyoxyethylene alkyl-modified dimethyl silicon), polyoxyethylene glycerin monostearate, polyoxyethylene Examples include alkyl glucoside. These may be used alone or in combination of two or more.

  In the solid cleaning composition of the present invention, the effect of improving transparency is exhibited by blending a nonionic surfactant.

  The content of the nonionic surfactant in the solid cleaning composition of the present invention is preferably 2 to 15% by mass, particularly 6 to 12% by mass. If the content is less than 2% by mass, the transparency may be lowered, or a feeling of tension may occur after use. On the other hand, if it exceeds 15% by mass, the freezing point is lowered, so that when stored for a long period of time, the surface may melt and the commercial value may be impaired. Moreover, there exists a possibility that hardness may fall or the melt-down at the time of use may become large. Furthermore, a sticky feeling may occur after use.

[Hydroxyalkyl ether carboxylate type surfactant]
It is preferable to add a hydroxyalkyl ether carboxylate type surfactant to the solid cleaning composition according to the present invention, and improvement of foaming is recognized.
A suitable hydroxyalkyl ether carboxylate type surfactant in the present invention has the following structure (D).

(In the formula, R ¹ represents a saturated or unsaturated hydrocarbon group having 4 to 34 carbon atoms; ^one of X ¹ and X ² represents —CH ₂ COOM ¹ and the other represents a hydrogen atom; M ¹ represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, a lower alkanolamine cation, a lower alkylamine cation, or a basic amino acid cation.)

In the formula, R ¹ may be an aromatic hydrocarbon, a linear or branched aliphatic hydrocarbon, but is preferably an aliphatic hydrocarbon, particularly an alkyl group or an alkenyl group. For example, butyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, docosyl, 2-ethylhexyl, 2-hexyldecyl, 2-octylundecyl, 2-decyltetradecyl , 2-undecylhexadecyl group, decenyl group, dodecenyl group, tetradecenyl group, hexadecenyl group and the like are preferable examples, and among them, decyl group and dodecyl group are excellent in terms of surface active ability.

In the formula, any one of X ¹ and X ² is represented by —CH ₂ COOM ¹ , and as M ¹ , a hydrogen atom, lithium, potassium, sodium, calcium, magnesium, ammonium, monoethanolamine, Examples include diethanolamine and triethanolamine.

Specifically, among the above (A) hydroxyalkyl ether carboxylate type surfactants, dodecane-1, in which H of any OH group of dodecane-1,2-diol is substituted with —CH ₂ COONa, 2-diol sodium ether acetate is most preferred in the present invention.
In the present invention, the hydroxyalkyl ether carboxylate type surfactant may be blended in an amount of 1 to 30% by mass, preferably 5 to 25% by mass from the viewpoint of improving foaming.

[Chelating agent]
Moreover, it is suitable to add a chelating agent to the cleaning composition according to the present invention.

  Moreover, as a chelating agent used suitably in this invention, hydroxyethane diphosphonic acid and its salt are mentioned, More preferably, it is hydroxyethane diphosphonic acid. As a compounding quantity, it is 0.001-1.0 mass%, More preferably, it is 0.1-0.5 mass%. When the amount of hydroxyethanediphosphonic acid and its salt is less than 0.001% by mass, the chelate effect is insufficient, causing inconveniences such as yellowing over time. The irritation increases, which is undesirable.

  In the solid cleaning composition of the present invention, the following components can be arbitrarily blended within the range not impairing the above-described action. This optional component includes fungicides such as trichlorocarbanilide and hinokitiol; maltitol, sorbitol, glycerin, 1,3-butylene glycol, propylene glycol, sugar, pyrrolidone carboxylic acid, sodium pyrrolidone carboxylate, hyaluronic acid, polyoxy Moisturizing agents such as ethylene alkyl glucoside ether; oils; fragrances; pigments; chelating agents such as edetate trisodium dihydrate; UV absorbers; antioxidants; Natural extracts such as chamomile, nonionic, cationic or anionic water-soluble polymers; Usability improvers such as lactic acid esters; sodium alkyl ether carboxylates, disodium alkyl sulfosuccinates, alkyl isethionic acids , And the like; thorium, polyoxyethylene alkyl sodium sulphate, acyl methyl taurine, sodium acyl glutamate, acyl sarcosine foaming improvers such as sodium Shin acid.

As for the method for producing the solid cleaning composition of the present invention, a general method such as a frame kneading method or a mechanical kneading method can be applied to the mixture of the components described above.
In addition, the solid cleaning composition of the present invention is basically transparent, but also includes those whose transparency is lowered by blending pigments and the like.

  As described above, according to the transparent solid cleaning composition of the present invention, it is possible to improve transparency and foam quality by using a specific amphoteric surfactant and polyoxyalkylene phytosterol together with a fatty acid soap. became.

Hereinafter, preferred embodiments of the present invention will be described.
In order to examine the improvement of foaming property of the fatty acid soap-based transparent solid cleaning composition, the present inventors have studied using the following basic formulation. In addition, a compounding quantity is shown by the mass%.

First, the present inventors added various components and examined the effects on transparency and foam quality. The results are shown in Table 2 below.

Polyoxyalkylene phytosterol: (POE) 30 (POP) 7 phytosterol polyoxyethylene 30 mol hydrogenated castor oil: HLB11
Polyoxyethylene cetyl ether HLB13.8

The foaming power was measured using a mixer-type foaming machine. That is, a 1% soap concentration aqueous solution (70 ppm artificial hard water, temperature 25 ° C.) is prepared, and the height of the foam after stirring for 20 seconds is measured.

Further, the friction solubility was measured according to JISK-3304. That is, a sample piece (cross section 15 mm × 20 mm) having a constant weight is placed on a film surface wetted with tap water adjusted to 40 ° C., and this film is rotated and frictionally dissolved for 10 minutes. From the weight before and after the friction dissolution, the friction solubility per fixed area was determined by the following formula.
Friction solubility (%) = (previous weight−rear weight) × 100/3

The hardness was shown by the maximum stress when the needle was pressed into the depth of 10 mm from the soap surface with a rheometer (manufactured by Fudo Kogyo Co., Ltd.).
As is clear from Table 2, even when polyoxyethylene hydrogenated castor oil, which is widely used for improving foaming, is used, it lacks creaminess. Further, when polyoxyethylene cetyl ether or glycerin is used, the foaming power is slightly improved, but the creamy feeling is still lacking.

On the other hand, when polyoxyalkylene phytosterol is used, the appearance at the time of cutting is slightly yellowish, and the amount of foam (foaming power) is not particularly remarkably improved. Moreover, the foam quality was creamy and extremely good.
Next, the present inventors examined each compounding quantity of polyoxyalkylene phytosterol. The results are shown in Table 3.

  As is clear from Table 3 above, the blending amount of polyoxyalkylene phytosterol showed good results in the entire test region, but at 0.5% by mass, the foam quality and transparency were slightly insufficient, whereas 15 When it becomes 0.0 mass%, the yellowishness will remain in the appearance after 4 weeks. As shown in the following Table 4 Test Example 3-4, even when (POE) 30 phytosterol 12.5% by mass is mixed, good results are shown, and the amount of polyoxyalkylene phytosterol is particularly preferably 1 to 13% by mass. Is understood.

As is apparent from Table 4 above, a similar trend is observed for (POE) 30 phytosterol, (POE) 20 phytosterol and mixtures thereof.

Claims (4)

A solid cleaning composition having a sodium or fatty acid sodium / potassium mixed salt content of 20 to 60% by mass ,
A solid cleaning composition comprising polyoxyalkylene phytosterol.
(Here, the polyoxyalkylene group of the polyoxyalkylene phytosterol is composed of 20 to 35 mol of ethylene oxide residue and 0 to 10 mol of propylene oxide residue). The composition according to claim 1, further comprising at least one amphoteric surfactant selected from the group consisting of compounds represented by the following chemical formulas (A) to (C):
A solid cleaning composition comprising: a nonionic surfactant.
[Wherein, R ₁ represents an alkyl group or alkenyl group having 7 to 21 carbon atoms, n and m are the same or different and represent an integer of 1 to 3, and Z represents a hydrogen atom or (CH ₂ ) _p COOY (where p is an integer of 1 to 3, and Y is an alkali metal ion , an alkaline earth metal ion, or an organic amine cation ). ],
[Wherein R ₂ represents an alkyl or alkenyl group having 7 to 21 carbon atoms, R ₃ and R ₄ are the same or different and represent an alkyl group having 1 to 3 carbon atoms ; Represents an alkylene group having 3 to 5 carbon atoms . ],and
[Wherein, R ₅ represents an alkyl group or alkenyl group having 8 to 22 carbon atoms, and R ₆ and R ₇ are the same or different and represent an alkyl group having 1 to 3 carbon atoms . ].   The composition according to claim 1 or 2, wherein 1.0 to 13.0% by mass of polyoxyalkylene phytosterol is blended. 4. The solid cleaning composition according to claim 2, wherein fatty acid sodium or a mixed salt of fatty acid sodium / potassium is blended in an amount of 20 to 40% by weight, and an amphoteric surfactant is blended in an amount of 2 to 10% by weight. Solid cleaning composition.