CN114010520A

CN114010520A - Personal care composition, preparation method and application

Info

Publication number: CN114010520A
Application number: CN202111395217.3A
Authority: CN
Inventors: 徐由江; 黄勇前; 朱红军; 郭静波
Original assignee: Zhangjiagang Great Chemicals Co ltd
Current assignee: Zhangjiagang Great Chemicals Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-02-08
Also published as: CN115645298A; CN115645298B

Abstract

The invention provides a personal care composition, a preparation method and application, and relates to the field of daily chemical products, wherein the personal care composition comprises 2-25% of N-alkanoyl taurate and 0.5-15% of amphoteric surfactant in percentage by weight, and other raw materials such as a non-sulfate anionic surfactant, a nonionic surfactant, a cationic polymer and a benefit agent can be added. The personal care composition prepared by taking the N-alkanoyl taurine sodium salt as a main anionic surfactant and utilizing the synergistic effect of the N-alkanoyl taurine salt and the amphoteric surfactant has no sulfate, and has excellent foaming performance, viscosity, long-term stability and the like besides necessary mildness.

Description

Personal care composition, preparation method and application

Technical Field

The invention relates to the field of daily chemical articles, in particular to a personal care composition, a preparation method and application.

Background

Generally, personal washing products such as shampoo and body wash have an anionic surfactant as a main surfactant. Because of the need for good foaming properties, most commercially available personal care compositions, such as body washes, shampoos, hand soaps, etc., are based on sulfate-containing surfactants such as SLS (sodium lauryl sulfate) or SLES (sodium laureth sulfate). Although these surfactants have good foaming properties and can be thickened easily, there has been growing interest in the market for the side effects of these and other sulfate-containing surfactants on the skin and body. At the same time, sulfate-based surfactants have a tendency to overdry the skin or hair, and therefore consumers prefer to use products that do not contain sulfate-based surfactants.

To meet the consumer demand for milder compositions, other surfactants (e.g., nonionic and/or amphoteric surfactants) are often used as primary surfactants in place of the sulfate anionic surfactants (e.g., CN106456479A discloses a sulfate-free personal care combination using amphoteric surfactants as primary surfactants), however, these compositions tend to have significantly less lathering and/or cleansing properties than compositions where the anion is the primary surfactant. Another way to provide mildness is to use milder anionic surfactants. Among such mild anionic surfactants, N-acyl amino acids and salts thereof may be used. However, such surfactant-based compositions often have problems, mainly in one or more of the following areas, compared to sulfate-based compositions: 1. foam is difficult to reach the equivalent level of sulfate; 2. it is difficult to thicken sufficiently to provide good organoleptic properties. Such cleansers do not remain on the hair or skin during and/or after application, and may drip and run into the eyes, mouth, ears, or nasal passages of the user. This can result in an unpleasant consumer experience. Currently, two approaches are taken to thicken sulfate-free detergent formulations. One approach involves the use of high levels of non-sulfate surfactants to exert the structuring properties of such ingredients. This approach is most common, but also expensive. The second approach involves the use of high levels of rheology modifiers; however, these components may cause problems of reduced foam and poor dispersibility. 3. It is difficult to form an isotropic transparent liquid. 4. The interaction between the amino acid surfactant and the cationic conditioning polymer leads to the instability of the system and the phenomena of turbidity, precipitation and delamination. In view of this, patent CN 111278416A by proclaim company specially designs a system with low inorganic salt content to solve the problem; 5. the system is fragile, has poor tolerance to electrolyte, or has a narrow pH application range. As described above, the presence of the electrolyte may deteriorate the isotropy of the N-acylamino acid salt surfactant, further affecting the stability of the system.

N-alkanoyl taurate is a kind of mild amino acid surfactant which is widely concerned, and some application patents related to N-alkanoyl taurate have been found in the past. It is to be noted that the N-alkanoyl taurates or N-acyl taurates mentioned in the prior patents are all N-methyl alkanoyl taurates or N-methyl alkanoyl taurates. The same problems exist with compositions containing N-methyl alkanoyl taurate as the primary surfactant and other N-acyl amino acid salts as the primary surfactant, and many of the patents concerned are directed to solving these problems. The senecio patent CN103702656 uses taurine derivative type surfactant as main anionic surfactant for anti-discoloration perfume, but in the examples, sodium cocoanut oil fatty acid methyl taurate is used. There is no real example in the patent relating to N-alkanoyl taurates. The seniority patent CN107205907 adopts a method of adding a large amount of sugar and/or sugar alcohol to solve the viscosity problem of the composition of the methyl taurine derivative, thereby not only greatly improving the cost of the composition, but also causing unnecessary resource waste. U.S. patent PCT/EP2018/064336 combines sodium cocoyl isethionate with N-acyl methyl taurate, along with glycerin and a small amount of amphoteric surfactant to achieve a certain viscosity and transparency effect that forms an isotropic solution. The invention content of patent CN103655240 is modified sodium cocoyl taurate which is formed by modifying sodium cocoyl taurate and can be thickened; patent CN107468531A uses N-alkanoyl alanine salt, N-alkanoyl sarcosine salt, N-methyl alkanoyl taurate as anionic surfactant instead of sulfate anionic surfactant, wherein emphasis is also on solving the transparency and viscosity problems of the composition. In the comparative example of patent CN110582266A from Qiangsheng corporation, sodium methylcocoyltaurate alone was used as an anionic surfactant, and it was difficult to achieve proper transparency and viscosity even at a low level in the composition. The main content of the seniority patents CN101928645A and CN1935967A is to use N-acyl methyl taurine or N-methyl taurate of alkyl sulfate to solve the slippery feel problem of the detergent composition. There is no real solution to the replacement of sulfate surfactants and the problems that result. Patent CN201710115813.9 discloses a face cleansing gel, which comprises the following components: an anionic surfactant selected from the group consisting of alkanoyl glycinates, alkanoyl taurates and mixtures thereof, wherein the alkanoyl taurate is also in the examples actually sodium methyl cocoyl taurate. Patent CN109481352 also relates to the use of sodium methyl cocoyl taurate; patent CN111135103 also uses fatty acyl methyl taurate. To date, the existing chemical substance list IECSC in China and the used cosmetic raw material catalog in various versions of China have not listed cocoyl taurate therein. Therefore, products using the alkanoyl taurate as the main surfactant do not exist in the Chinese market.

The present inventors have surprisingly found that the above prior art problems can be almost perfectly solved by using a composition of sodium alkanoyltaurate as a primary surfactant, together with an auxiliary amphoteric surfactant.

Disclosure of Invention

The technical scheme adopted by the invention is as follows:

the invention provides a personal care composition comprising, by weight, 2-25% of an N-alkanoyl taurate and 0.5-15% of an amphoteric surfactant.

Further, the structural formula of the N-alkanoyl taurate is:

wherein R is a saturated or unsaturated hydrocarbon group of C7-C21, which contains a branched chain or no branched chain; m is an alkali metal ion, an alkaline earth metal ion or organic ammonia;

preferably, the carbon chain of the N-alkanoyl group in the N-alkanoyl taurate is C8-C22, including single carbon chains or mixed carbon chains; further preferred is cocoyl.

Further, the amphoteric surfactant comprises one or more of betaine, sulfobetaine, hydroxysulfobetaine, amphoteric hydroxypropyl sulfonate, amine oxide, propyl amine oxide, alkyl amphoacetate, and alkyl amphodiacetate; preferably cocamidopropyl betaine.

Further, the total amount of all surfactants is greater than or equal to 7%, and the amount of N-alkanoyl taurates is greater than or equal to the amount of amphoteric surfactants.

Further, adjusting the viscosity by using not more than 5 wt% of electrolyte; the electrolyte comprises one or more of the following raw materials: sodium chloride, potassium chloride, ammonium chloride, sodium carbonate, sodium citrate, sodium phosphate, sodium hydrogen phosphate, potassium phosphate, etc., with sodium chloride being preferred.

Further, one or more of a non-sulfate anionic surfactant, a nonionic surfactant, and a cationic polymer are included.

Further, the content of the non-sulfate anionic surfactant is not higher than 10% by weight; the non-sulfate anionic surfactant comprises one or more of the following raw materials: sodium, ammonium or potassium salts of hydroxypropyl sulfonates; sodium, ammonium or potassium isethionate; sodium, ammonium or potassium salts of sulfonates; sodium salts of alpha-alkenyl sulfonates; sodium, ammonium or potassium salts of ethersulfonates; sodium, ammonium or potassium salts of sulfosuccinates; sodium, ammonium or potassium salts of sulfoacetates; sodium, ammonium or potassium glycinate salts; sodium, ammonium or potassium sarcosinate salts; glutamate and nano-salts of sodium, ammonium or potassium are not understood; sodium, ammonium or potassium salts of alanine salts; sodium, ammonium or potassium salts of carboxylic acid salts; sodium, ammonium or potassium salts of acylmethyltaurine; sodium, ammonium or potassium salts of phosphoric acid esters.

Further, the content of the nonionic surfactant is not higher than 10% by weight; the nonionic surfactant comprises one or more of alkyl polyglucoside, alkyl glycoside, acyl glucamide, polyoxyethylene sorbitan, methyl glucoside dioleate polyoxyethylene, lauryl glyceride, alkanoyl monoethanolamide, and cocoyl methyl monoethanolamide; preferably an alkyl glycoside.

Further, the content of the cationic polymer is not higher than 2% by weight; the cationic polymer comprises one or more of cationic guar gum, cationic cellulose, cationic synthetic homopolymers, and cationic synthetic copolymers; polyquaternium 10 is preferred.

Further, the personal care composition further comprises one or more of a benefit agent, a pH adjuster, and a preservative. The content of the beneficial agent is preferably not higher than 10%, the pH regulator is 0.05-0.5%, and the preservative is 0.01-2% in percentage by weight.

Specifically, the benefit agents are: moisturizer beneficial to skin or hair, and water-soluble or oil-soluble oil

Preferably, the beneficial agent is one or more of siloxane, water-soluble grease and polyalcohol; the transparency is affected by adding oil-soluble oil, but the long-term stability can be maintained.

The pH regulator comprises one or more of citric acid, hydrochloric acid, phosphoric acid, lactic acid and salicylic acid; citric acid is preferred. The preservative comprises one or more of benzyl alcohol, phenoxymethanol, phenoxyethanol, imidazolidinyl urea, sodium benzoate, potassium sorbate, salicylic acid, methylchloroisothiazolinone, and methylisothiazolinone.

Further, the personal care composition comprises 60-93% water by weight percentage.

The present invention also provides a process for preparing the above personal care composition comprising the steps of:

adding the other components except the preservative and the beneficial agent into water, stirring and heating until all the raw materials are uniformly dispersed and transparent; adding acid and alkali regulator to regulate pH, cooling, and adding antiseptic and beneficial agent.

Further, the personal care compositions of the present invention can be used in laundry care products.

The technical effects obtained by the invention are as follows:

the invention takes N-alkyl acyl taurate as main anionic surfactant, takes amphoteric surfactant as auxiliary surfactant, and utilizes the synergistic effect between the N-alkyl acyl taurate and the amphoteric surfactant to prepare the personal care composition without sulfate, which has the following performance characteristics except necessary mildness: 1. excellent foaming performance; 2. can be easily thickened, including the use of electrolytes or other nonionic surfactants, in order to obtain various suitable viscosities; 3. the isotropic transparent appearance can be realized, so that the long-term stability is expected; 4. the shampoo has stronger compatibility with cationic polymers, and the hair washing effect is more flexible; 5. various beneficial agents can be conveniently and further added to meet different requirements of consumers. The composition of the invention takes the N-alkanoyl taurate as the main anionic surfactant and is matched with the amphoteric surfactant, and all the performances can be almost perfectly realized.

Drawings

FIG. 1 is a graph showing cationic flocculation of the products of example 2, comparative example 4 and comparative example 5;

FIG. 2 is a graph showing the viscosity of the products of example 2, comparative example 4 and comparative example 5;

FIG. 3 shows the viscosity of the products of example 3, comparative example 6 and comparative example 7.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.

When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the raw materials used in the present invention are all common commercial products, and thus the sources thereof are not particularly limited.

In the following examples and comparative examples, the amount of the additive was expressed in weight percentage unless otherwise specified.

The preparation method of all examples and comparative examples is as follows: adding the other components except the preservative and the beneficial agent into water, stirring and heating until all the raw materials are uniformly dispersed and transparent; adding acid and alkali regulator to regulate pH, cooling, and adding antiseptic and beneficial agent.

First, the viscosity and the foam quantity of the composition of the invention are tested

The test method comprises the following steps:

(1) viscosity:

the viscosity and flow properties of the liquid product were determined using a GB/T15357 surfactant and detergent rotational viscometer, measured at 25 ℃.

(2) Transparency:

testing an instrument: 721 visible spectrophotometer

The test method comprises the following steps: the light transmittance at a wavelength of 600nm was measured for each example, and the light transmittance exceeding or equal to 85% was recorded as transparent, indicated by ∘, and the light transmittance below 85% was recorded as opaque, indicated by x.

(3) Foaming:

testing an instrument: SITA foam tester

The test method comprises the following steps: 2g of the composition in each example were taken, 150mg/kg of hard water was added to 500ml, the mixture was stirred at a constant temperature of 40 ℃ and 1000rpm for 30 seconds, and the amount of foam was recorded.

As a personal care cleansing product, it is required to have a suitable foaming capacity, and generally more than 800mL of foam is required.

Second, the composition of the present invention is tested for mildness

The test method comprises the following steps: 6 parallel samples are set in each group by adopting an IS scoring method according to an SN/T2329-2009 eye irritation/corrosiveness chick embryo chorioallantoic membrane test.

Example 1

A comparison was made with a combination of sodium N-alkanoyl taurate and cocamidopropyl betaine at 25% total surfactant, with sodium N-alkanoyl taurate (comparative example 1) or cocamidopropyl betaine (comparative example 2) in a single component, and with conditions of the same pH (i.e. 5.5).

Table 1 (the contents of each component are in weight percent)

Very significantly, the viscosity of example 1 is consistent with the normal personal care product range, with sodium N-alkanoyl taurate alone exhibiting an unstable layered state, and cocamidopropyl betaine alone being too low in viscosity. At the same time, the foaming capacity (initial foam amount) and foam stabilizing capacity (5 minute foam amount) of example 1 were also significantly better than either sodium N-alkanoyl taurate or cocamidopropyl betaine alone.

Similarly, the combination of sodium methyl cocoyl taurate and amphoteric surfactant formulation of comparative example 3 has a very low viscosity and does not achieve a clear appearance, while the foam is somewhat inferior.

Example 2

The system pH was adjusted at 5.5 with a total surfactant content of 15% and polyquaternium 10 was added to improve conditioning performance.

Table 2 (the contents of each component are in percentage by weight)

Foaming: good to bad order: example 2 > comparative example 5 > comparative example 4, i.e. sodium cocoyl taurate combination > sodium methyl cocoyl taurate combination > lauryl alcohol ether sulfate combination

Conditioning effect: referring to fig. 1, it can be seen that example 2 and comparative example 5 are much more effective than the sulfate combination of comparative example 4 in the case of cationic flocs.

The mildness is as follows: as can be seen from the irritation values, example 2 and comparative example 5 are much more effective than the sulfate combination of comparative example 4.

Viscosity: conditioning with electrolyte (sodium chloride), see fig. 2; it can be seen that both example 2 and comparative example 4 have good electrolyte compatibility, and the sodium methyl cocoyl taurate combination (comparative example 5) apparently cannot increase viscosity using electrolyte and is prone to instability (turbidity).

Example 3

2 amphoteric surfactants were used at a total surfactant content of 14% in combination with a nonionic surfactant, versus a total surfactant content of less than 7%.

Table 3 (the contents of each component are in weight percent)

Composition	Example 3	Comparative example 6	Comparative example 7
				Coconut oil acyl sodium taurate	7	3.5	3.6
Cocoamidopropyl betaine	2.5	1.25	2.4
				Lauroyl amphoacetate sodium salt	2.5	1.25	-
Alkyl glycoside APG1214	2	1	-
				Polyquaternary ammonium salt-10 (JR400)	0.2	0.1	0.1
Sodium chloride	Adjusting the appropriate viscosity	Adjusting the appropriate viscosity	Adjusting the appropriate viscosity
				Water (W)	85.8	92.9	89.8

Referring to fig. 3, like example 2, example 3 can be adjusted to a suitable viscosity using an electrolyte, and when the total surfactant content is less than 7% (comparative example 6 to example 3, comparative example 7 to example 2), it is difficult to achieve the desired viscosity.

The compositions and proportions of the examples 4-10 are shown in the following table:

table 4 (the contents of each component are in weight percent)

The preparation methods of the examples and comparative examples of the present invention are as follows: adding the other components except the preservative and the beneficial agent into water, stirring and heating until all the raw materials are uniformly dispersed and transparent; adding acid and alkali regulator to regulate pH, cooling, and adding antiseptic and beneficial agent.

Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A personal care composition characterized by: comprises 2-25% of N-alkanoyl taurate and 0.5-15% of amphoteric surfactant in percentage by weight.

2. The personal care composition of claim 1, characterized in that: the structural formula of the N-alkanoyl taurate is as follows:

wherein R is a saturated or unsaturated hydrocarbon group of C7-C21, which contains a branched chain or no branched chain; m is an alkali metal ion, an alkaline earth metal ion or organic ammonia; preferably, the carbon chain of the N-alkanoyl group in the N-alkanoyl taurate is C8-C22, including single carbon chains or mixed carbon chains; further preferred are cocoyl and lauroyl.

3. The personal care composition of claim 1, characterized in that: the amphoteric surfactant comprises one or more of betaine, sulfobetaine, hydroxysulfobetaine, amphoteric hydroxypropyl sulfonate, amine oxide, propyl amine oxide, alkyl amphoacetate and alkyl amphodiacetate; preferably cocamidopropyl betaine.

4. The personal care composition of claim 1, characterized in that: the total amount of all surfactants is greater than or equal to 7% and the amount of N-alkanoyl taurates is greater than or equal to the amount of amphoteric surfactants.

5. The personal care composition of claim 1, characterized in that: further comprising adjusting the viscosity with not more than 5 wt% of an electrolyte; the electrolyte comprises one or more of the following raw materials: sodium chloride, potassium chloride, ammonium chloride, sodium carbonate, sodium citrate, sodium phosphate, sodium hydrogen phosphate, potassium phosphate, etc., with sodium chloride being preferred.

6. The personal care composition of claim 1, characterized in that: further comprising one or more of a non-sulfate anionic surfactant, a nonionic surfactant, and a cationic polymer.

7. The personal care composition of claim 6, characterized in that: the content of the non-sulfate anionic surfactant is not higher than 10% by weight percentage; the non-sulfate anionic surfactant comprises one or more of the following raw materials: sodium, ammonium or potassium salts of hydroxypropyl sulfonates; sodium, ammonium or potassium isethionate; sodium, ammonium or potassium salts of sulfonates; sodium salts of alpha-alkenyl sulfonates; sodium, ammonium or potassium salts of ethersulfonates; sodium, ammonium or potassium salts of sulfosuccinates; sodium, ammonium or potassium salts of sulfoacetates; sodium, ammonium or potassium glycinate salts; sodium, ammonium or potassium sarcosinate salts; sodium, ammonium or potassium salts of glutamate; sodium, ammonium or potassium salts of alanine salts; sodium, ammonium or potassium salts of carboxylic acid salts; sodium, ammonium or potassium salts of acylmethyltaurine; sodium, ammonium or potassium salts of phosphoric acid esters.

8. The personal care composition of claim 6, characterized in that: the content of the nonionic surfactant is not higher than 10% by weight percentage; the nonionic surfactant comprises one or more of alkyl polyglucoside, alkyl glycoside, acyl glucamide, polyoxyethylene sorbitan, methyl glucoside dioleate polyoxyethylene, lauryl glyceride, alkanoyl monoethanolamide, and cocoyl methyl monoethanolamide; preferably an alkyl glycoside.

9. The personal care composition of claim 6, characterized in that: the content of the cationic polymer is not higher than 2% by weight; the cationic polymer comprises one or more of cationic guar gum, cationic cellulose, cationic synthetic homopolymers, and cationic synthetic copolymers; polyquaternium 10 is preferred.

10. The personal care composition of claim 1, characterized in that: further comprising one or more of a benefit agent, a pH adjuster, and a preservative; the content of the beneficial agent is preferably not higher than 10%, the pH regulator is 0.05-0.5%, and the preservative is 0.01-2% in percentage by weight.

11. A method of making a personal care composition according to claim 8, wherein: the method comprises the following steps:

adding the other components except the preservative and the beneficial agent into water, stirring and heating until all the raw materials are uniformly dispersed and transparent;

adding acid and alkali regulator to regulate pH, cooling, and adding antiseptic and beneficial agent.

12. Use of a personal care composition according to any one of claims 1 to 10 in a laundry product.