CN110946780A

CN110946780A - Stick-shaped soap-based cosmetic and pH adjusting method thereof

Info

Publication number: CN110946780A
Application number: CN201911410958.7A
Authority: CN
Inventors: 曾四立; 徐金萍; 程丽娟; 杨令; 张士双; 崔晓华
Original assignee: Shanghai Chuangyuan Cosmetics Co ltd
Current assignee: Shanghai Chuangyuan Cosmetics Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-03

Abstract

The invention relates to a bar-shaped soap-based cosmetic and a pH adjusting method thereof. In particular, lecithin is used as a pH regulator in the soap-based bar product, so that the hardness of the product can reach the effect of normal use, the pH value is less than 9, the irritation of high pH to the skin can be reduced, the hardness of the product cannot be reduced, and the product can be attached to the skin to moisten the skin.

Description

Stick-shaped soap-based cosmetic and pH adjusting method thereof

Technical Field

The invention relates to the field of cosmetics, in particular to a bar-shaped soap-based cosmetic and a pH adjusting method thereof.

Background

The beauty is pursued, so that the color cosmetics become an important part in modern life, wherein the bar-shaped products such as lipstick, eyebrow pencil, foundation stick, makeup removing stick and the like have unique existing forms, are convenient to carry, have the advantages of no hand-dirtying and the like, and quickly become a hot spot of the color cosmetics, and the soap-based bar-shaped system is favored by consumers and manufacturers due to the shiny pearlescent appearance.

At present, two common rod-shaped products in the market are mainly provided, one is an oil-wax system, the products usually use wax as a corresponding supporting framework to achieve proper hardness, the second is a soap-based system, the hardness of the products has a considerable relation with the hardness of the products and the added materials, the most intuitive expression is that the pH value of the system is higher, the materials with higher acidity can reduce the pH value of the soap and soften the soap when the adding proportion is too large; the soap becomes hard due to the addition of the saponin-containing material, which has a high alkalinity. Soap-based stick forms because of the formulation system, if saponified into a stick, the formulation must contain sufficient basic groups to achieve a high pH to achieve hardness for normal use.

The skin feel of the oil wax rod-shaped color cosmetics is single, the soap-based system is mainly applied to daily washing and protecting at present, but the development of the soap-based system in the color cosmetics industry is greatly limited due to the low-temperature stability and the high pH value of the soap-based system. In order to achieve the purpose of reducing the pH of the system, citric acid or acidic raw materials are mostly added in the preparation process so as to achieve the purpose of reducing the pH of the system, but the collapse of a rod-shaped framework structure is brought about.

Therefore, on the basis of ensuring the rod-shaped sample, the difficulty to be solved urgently is to reduce the pH value of the soap-based system to the range of safe use of the color cosmetic product.

Disclosure of Invention

In order to solve the problems, the invention provides a method for effectively adjusting the pH value of a soap-based system and a product obtained by using the method.

The invention aims to provide a soap-based product, which comprises the following components in parts by weight: 2.5-10 parts of emulsifier, 2-30 parts of oil phase, 0.1-10 parts of phospholipid compound and 1-10 parts of stearate, wherein the content is based on the total weight of the product.

In another preferred embodiment, the phospholipid compound comprises: soy lecithin, phospholipids, lecithin, cephalin, hydroxylated lecithin, hydrogenated phosphatidylcholine, hydrogenated lecithin, hydrogenated lysolecithin, or combinations thereof.

In another preferred embodiment, the content of the phospholipid compound is 0.15 to 5 parts by weight, preferably 0.2 to 3 parts by weight, more preferably 0.2 to 1 part by weight.

In another preferred embodiment, the soap-based product further comprises a preservative, preferably, the preservative is contained in an amount of 0.5 to 2 parts by weight, more preferably, 0.8 to 1 part by weight.

In another preferred embodiment, the soap-based product comprises the following components in parts by weight: 2.5-7.5 parts of emulsifier, 2-20 parts of oil phase, 0.1-5 parts of phospholipid compound, 1-10 parts of stearate, 0.8-1 part of preservative and a cosmetically acceptable carrier, wherein the content is based on the total weight of the product.

In another preferred embodiment, the emulsifier is a surfactant, preferably, the emulsifier is selected from the group consisting of: an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, a silicone oil emulsifier, or a combination thereof.

In another preferred embodiment, the anionic surfactant is selected from the group consisting of: carboxylate, sulfonate, sulfate ester salt, phosphate ester salt, or a combination thereof.

In another preferred embodiment, the nonionic surfactant comprises polyoxyethylene type and/or polyhydric alcohol type, preferably, the nonionic surfactant is selected from the group consisting of: alkanolamides, fatty alcohol-polyoxyethylene ethers, alkylphenol ethoxylates, sorbitan oleate, polyoxyethylene sorbitan oleate, alkyl glucosides, ethylene oxide propylene oxide block polyethers, or combinations thereof.

In another preferred embodiment, the emulsifier is sorbitan isostearate, polysorbate, olive oil PEG-7 esters

In another preferred embodiment, the emulsifier comprises the following components in parts by weight: 1-2 parts of sorbitan isostearate, 0.5-1.5 parts of polysorbate and 1-3 parts of olive oil PEG-7 esters

In another preferred embodiment, the oil phase is selected from the group consisting of: vegetable oils, mineral oils, silicone oils, synthetic oils, waxes, or combinations thereof.

In another preferred embodiment, the oil phase is selected from the group consisting of: caprylic/capric triglyceride, myristyl myristate, carnauba wax, or combinations thereof.

In another preferred embodiment, the oil phase comprises the following components in parts by weight: 2-4 parts of caprylic/capric triglyceride, 1-3 parts of myristyl myristate and 6-10 parts of carnauba wax.

In another preferred embodiment, the stearate comprises sodium stearate and/or potassium stearate.

In another preferred embodiment, the cosmetically acceptable carrier is a hydroalcoholic phase.

In another preferred embodiment, the soap-based product further comprises a composition selected from the group consisting of: a humectant, an antioxidant, an anti-ultraviolet agent, a film forming agent, a clouding agent, a thickener, a solubilizer, a stabilizer, an organically modified clay mineral, a resin, an antibacterial agent, a pigment, an essence, a salt, a pH adjusting agent, a chelating agent, a cooling agent, an anti-inflammatory agent, a skin beautifying ingredient, a vitamin, or a combination thereof.

In another preferred embodiment, the soap-based product further comprises other pH adjusting agents, preferably 0.02-0.1 parts by weight of sodium citrate.

In another preferred embodiment, the soap-based product further comprises: xanthan gum, sodium acrylate copolymer, butylene glycol, glycerin, PEG/PPG-17/6 copolymer, sodium chloride, sodium citrate, pigment, preservative, or a combination thereof.

In another preferred embodiment, the soap-based product further comprises mica, preferably the mica is present in an amount of 5 to 20 parts by weight.

In another preferred embodiment, the soap-based product comprises the following components in the following amounts by weight of the total product: 0.02-0.1 wt.% xanthan gum, 0.2-1.5 wt.% lecithin, 0.5-5 wt.% sodium acrylate copolymer, 2-6 wt.% butylene glycol, 2-6 wt.% glycerin, 2-10 wt.% PEG/PPG-17/6 copolymer, 2-10 wt.% sodium stearate, 0.5-2 wt.% sodium chloride, 0.02-0.1 wt.% sodium citrate, 1-2 wt.% pigment, 0.5-1 wt.% preservative, 5-15 wt.% mica, 0.5-2 wt.% sorbitan isostearate, 0.5-1.5 polysorbate, 2-4 wt.% caprylic/capric triglyceride, 1-3 wt.% myristyl myristate, 1-3 wt.% olive oil PEG-7 esters, 6-10 wt.% carnauba wax, and water.

In another preferred embodiment, the soap-based product is in the form of a solid, preferably a stick solid.

In another preferred embodiment, the soap-based product has a pH < 9.

In a second aspect of the present invention, there is provided a method for preparing a soap-based product, the method comprising the steps of:

(a) providing 2.5-10 parts of emulsifier, 2-30 parts of oil phase, 0.1-10 parts of phospholipid compound, 1-10 parts of stearate and 30-70 parts of cosmetically acceptable carrier, and heating and mixing to obtain a mixture;

(b) subpackaging the mixture in the step (a) to obtain the soap products.

In a third aspect of the invention, there is provided a method of reducing soap-based products, the method comprising the steps of:

adding 0.1-10 parts of phospholipid compound into soap-based product to reduce pH of the soap-based product.

In another preferred embodiment, the components of the soap-based product and the contents thereof are as described in the first aspect of the present invention.

It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.

Detailed Description

The inventor of the invention has found through extensive and intensive research and extensive screening that the use of a phospholipid compound (such as lecithin) as a pH regulator in a soap-based bar product can ensure that the hardness of the product can achieve the effect of normal use, the pH value is less than 9, the irritation of high pH to the skin can be reduced, the hardness of the product can not be reduced, and the product can be better attached to the skin to moisten the skin. The present invention has been completed based on this finding.

In order that the invention may be more readily understood, certain technical and scientific terms are specifically defined below. Unless otherwise defined herein, all other 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.

As used herein, the term "about" when used in reference to a specifically recited value means that the value may vary by no more than 1% from the recited value. For example, as used herein, the expression "about 100" includes 99 and 101 and all values in between (e.g., 99.1, 99.2, 99.3, 99.4, etc.).

As used herein, the term "comprising" or "includes" can be open, semi-closed, and closed. In other words, the term also includes "consisting essentially of …," or "consisting of ….

As used herein, the term "optional" or "optionally" means that the subsequently described event or circumstance may, but need not, occur.

The invention provides a novel method for reducing the pH of a soap-based rod system, which is characterized in that 0.1-10% of phospholipid compound (such as lecithin) is added into the soap-based system, under the condition of reducing the pH of the system, the hardness of the system is kept unchanged, the hardness of the product is not changed, the cold use feeling of a user is not changed, the stimulation effect of high pH on the skin is reduced, the skin can be moistened more, and a stable low-pH rod system product with certain hardness can be formed.

In a preferred embodiment of the present invention, the above object is achieved by a system comprising, based on the total weight of the system

① emulsifier: 2.5 wt.% to 5.0 wt.%;

② oil phase 2.0-20.0 wt.%;

③ preservative 0.8-1 wt.%;

④ pH adjusting phase, 0.1-5 wt.%;

⑤ stearate 1-10 wt.%;

⑥ aqueous alcohol phase, finally constant volume to total weight of 100.0 wt.%.

Emulsifier

The emulsifier of the invention comprises anionic surfactant, nonionic surfactant, amphoteric surfactant and silicone oil emulsifier.

Anionic surfactants, such as carboxylate, sulfonate, sulfate and phosphate. For example, the anionic surfactant is selected from the group consisting of: sodium fatty alcohol polyoxyethylene ether sulfate (AES), ammonium lauryl sulfate, ammonium laureth sulfate, N-acyl amino acid salts, N-acyl hydrolyzed protein salts, N-methyl acyl taurates, or combinations thereof; preferably, the anionic surfactant is sodium fatty alcohol polyoxyethylene ether sulfate (AES).

Nonionic surfactant: polyoxyethylene type and polyhydric alcohol type, commonly used are alkanolamide, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene, sorbitan oleate, sorbitan isostearate, polysorbate, polyoxyethylene sorbitan oleate, olive oil PEG-7 esters, alkyl glucoside, ethylene oxide propylene oxide block polyether.

Amphoteric surfactant of amino acid type and betaine type. Amphoteric surfactants suitable for use in the present invention include, but are not limited to, one or more of the following groups: an alkyl betaine type surfactant, an amido betaine type surfactant, a sulfobetaine type surfactant, a hydroxysulfobetaine type surfactant, an amido sulfobetaine type surfactant, a phosphoric acid betaine type surfactant, an imidazoline betaine type surfactant, an amino acid type surfactant, or a combination thereof. Among them, preferred are propyl betaine lauramide, betaine lauryl dimethyl aminoacetate, coconut fatty acid amidopropyl betaine, coconut fatty acid dimethyl aminoacetate betaine, lauryl hydroxysultaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl-imidazolinium betaine, lauryl iminodipropionate, or a combination thereof. For example, the amphoteric surfactant is selected from the group consisting of: sodium lauroamphoacetate (L32), cocamidopropyl betaine (CAB-35), coco aminopropionic acid, lauryl aminobutyric acid, or a combination thereof.

Oil phase

In the present invention, the oil phase is an oil phase conventionally contained in skin care products, and there is no other particular limitation on the selection of each component in the oil phase, and all the components of the oil phase which are allowed to be used in cosmetics can be used. It may be at least one kind of oil selected from conventionally used vegetable oils, mineral oils, silicone oils and synthetic oils, and may also be various conventionally used waxes.

pH adjusting phase

As used herein, the present invention uses phospholipid compounds as pH adjusting agents. The phospholipid compounds comprise soy lecithin, phospholipids, lecithin, cephalin, hydroxylated lecithin, hydrogenated phosphatidylcholine, hydrogenated lecithin, hydrogenated lysolecithin, or combinations thereof.

Stearate salt

In the present invention, the stearate mainly contains sodium stearate or potassium stearate.

Aqueous alcohol phase

As the carrier for the product of the present invention, any conventional carrier can be used, and examples thereof include pure water, mineral water, ethanol, glycerol, squalene, 1, 3-propanediol, 1, 3-butanediol, castor oil, camellia oil and liquid petrolatum.

In the present invention, the hydroalcoholic phase contains, in addition to water, other water-soluble substances. These substances may be those which are normally contained in an aqueous phase for personal care and cosmetic preparations. Especially ethanol and/or a C2-C5 polyol containing two or more hydroxyl groups, e.g. three hydroxyl groups, the latter preferably being glycerol, propylene glycol, 1, 3-butanediol or any mixture thereof, especially glycerol.

The composition of the present invention can be prepared in a unit volume form by formulating it with a cosmetically acceptable carrier and/or excipient according to a method easily implemented by those skilled in the art to which the present invention pertains, or by filling it in a large-volume container. Preferably, the dosage form of the invention is a solid, preferably a rod-shaped solid.

The main advantages of the invention

The invention provides a novel method for reducing pH, which is characterized in that 0.1-10% of phospholipid compound (such as lecithin) is added into a soap base system, under the condition of reducing the pH of the system, the hardness of the system is kept unchanged, the hardness of the product is not changed, not only cold use feeling is provided for a user, but also the stimulation effect of high pH on skin is reduced, the skin can be moistened, and a stable low pH (pH is less than 9) rod-shaped system product with certain hardness can be formed.

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out under conventional conditions or conditions recommended by the manufacturers. Unless otherwise indicated, percentages and parts are percentages and parts by weight.

Example 1

Table 1 the ingredients and their contents of example 1

The above bodies were prepared according to the components and contents of table 1, with the following steps:

heating and stirring A1-A2 phase uniformly at 50-85 deg.C, and making the material body state uniform and fine without granule feeling; heating C1 and C2 under stirring at 60-95 deg.C, adding C1 and C2 into A1-A2 at 50-90 deg.C, stirring, adding phase B, stirring, bottling at 60-80 deg.C, and cooling

Hardness test was performed on sample 1:

the hardness test method comprises the following steps: us boreh fly CT3 texture analyzer, test conditions: TA10 target value: 5mm load: 5g test speed: 0.5mm/s, pH dilution method, dilution ratio 1:9, namely 10% aqueous solution.

As shown in table 2 below, it can be seen that the pH of the prepared sample 1 is only 8.90, which greatly reduces the irritation to the skin, and the hardness is not reduced to 92, which can achieve the effect of normal use, and the addition of lecithin can make the product more fit with the skin and moisten the skin.

TABLE 2 pH and hardness of sample 1

pH	Hardness of
		8.90	92

Example 2

Table 3 the components and their contents of example 2

The above bodies were prepared according to the components and contents of table 3, with the following steps:

Hardness test was performed on sample 2:

As shown in table 4 below, it can be seen that the pH of the prepared sample 2 is only 8.30, which greatly reduces the irritation to the skin, and the hardness is not reduced to 96, which can achieve the effect of normal use, and the addition of lecithin can make the product more fit with the skin and moisten the skin.

TABLE 4 pH and hardness of sample 2

pH	Hardness of
		8.30	96

Example 3

Table 5 the components and their contents of example 3

The above bodies were prepared according to the components and contents of table 5, with the following steps:

heating and stirring A1-A2 phase uniformly at 50-85 deg.C, and making the material body state uniform and fine without granule feeling; heating C1 and C2 under stirring at 60-95 deg.C, adding C1 and C2 into A1-A2 at 50-90 deg.C, stirring, adding phase B, stirring, packaging at 60-80 deg.C, and cooling.

Hardness test was performed on sample 3:

As shown in table 6 below, it can be seen that the pH of the prepared sample 1 is only 8.80, so that the irritation to the skin is greatly reduced, the hardness is not reduced to 90, the normal use effect can be achieved, and the addition of lecithin enables the product to be more attached to the skin and moisturize the skin.

TABLE 6 pH and hardness of sample 3

pH	Hardness of
		8.80	90

Example 4

Table 7 the ingredients and their amounts of example 3

Hardness test was performed on sample 4:

TABLE 8 pH and hardness of sample 3

pH	Hardness of
		8.50	91

Example 4

Table 9 the components and their contents of example 4

Sample 5 was subjected to hardness test:

As shown in Table 8 below, it can be seen that the pH of the prepared sample was 9.77, and that high pH is likely to cause liposuction and skin irritation, and after use, the mouth is easily dried, the feeling of use is poor, and the skin irritation is strong.

TABLE 10 pH and hardness of sample 3

pH	Hardness of
		9.77	92

All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications of the present invention can be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.

Claims

1. The soap-based product is characterized by comprising the following components in parts by weight: 2.5-10 parts of emulsifier, 2-30 parts of oil phase, 0.1-10 parts of phospholipid compound and 1-10 parts of stearate.

2. The soap-based product of claim 1, wherein the phospholipid compound comprises: soy lecithin, phospholipids, lecithin, cephalin, hydroxylated lecithin, hydrogenated phosphatidylcholine, hydrogenated lecithin, hydrogenated lysolecithin, or combinations thereof.

3. The soap-based product according to claim 1, wherein the soap-based product comprises the following components in parts by weight: 2.5-7.5 parts of emulsifier, 2-20 parts of oil phase, 0.1-5 parts of phospholipid compound, 1-10 parts of stearate, 0.8-1 part of preservative and a cosmetically acceptable carrier, wherein the content is based on the total weight of the product.

4. The soap-based product of claim 1, wherein the emulsifier is a surfactant, preferably wherein the emulsifier is selected from the group consisting of: an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, a silicone oil emulsifier, or a combination thereof.

5. The soap-based product of claim 1, wherein the oil phase is selected from the group consisting of: vegetable oils, mineral oils, silicone oils, synthetic oils, waxes, or combinations thereof.

6. The soap-based product of claim 1, wherein the oil phase comprises the following components in parts by weight: 1-2 parts of sorbitan isostearate, 0.5-1.5 parts of polysorbate, 2-4 parts of caprylic/capric triglyceride, 1-3 parts of myristyl myristate, 1-3 parts of olive oil PEG-7 esters and 6-10 parts of carnauba wax.

7. The soap-based product of claim 1, wherein the stearate comprises sodium stearate and/or potassium stearate.

8. The soap-based product of claim 1, further comprising a composition selected from the group consisting of: a humectant, an antioxidant, an anti-ultraviolet agent, a film forming agent, a clouding agent, a thickener, a solubilizer, a stabilizer, an organically modified clay mineral, a resin, an antibacterial agent, a pigment, an essence, a salt, a pH adjusting agent, a chelating agent, a cooling agent, an anti-inflammatory agent, a skin beautifying ingredient, a vitamin, or a combination thereof.

9. The soap-based product according to claim 1, wherein the soap-based product is in the form of a solid, preferably a stick solid.

10. A method of making a soap-based product, the method comprising the steps of:

(b) heating and filling the mixture in the step (a) to obtain the soap-based bar-shaped product.