CN112190494A

CN112190494A - Cosmetic cleaning formulations

Info

Publication number: CN112190494A
Application number: CN202010638759.8A
Authority: CN
Inventors: 陈亮; 杜和亮
Original assignee: Nivea Shanghai Co ltd; Beiersdorf AG
Current assignee: Nivea Shanghai Co ltd; Beiersdorf AG
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2021-01-08
Also published as: WO2022007341A1; CN115884745A; CN112190494A8

Abstract

The present invention relates to cosmetic cleaning formulations. The cosmetic cleansing formulation comprises a) sodium cocoyl glycinate, and b) potassium cocoyl glycinate, characterized in that the weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate is from 3:1 to 1: 10. The formulations of the present invention can achieve a synergistic increase in foam volume and exhibit allows for skin moisturization comparable to water, and better skin moisturization values than soap-based cleansers.

Description

Cosmetic cleaning formulations

Technical Field

The present invention relates to the field of cosmetics, and in particular to cleaning formulations.

Background

The beautiful and charming appearance is a desire of many people. A typical sign of such appearance is a healthy, smooth looking skin. Therefore, in order to care for the skin, many people routinely apply cosmetics such as cleansing and moisturizing products.

Cosmetic cleansing products are used to remove dirt, sebum and perspiration from human skin. Surfactants are used as active ingredients, which allow the product to exert an effective cleaning action. Those skilled in the art are aware of many surfactants that can be used in cosmetic cleansing products. They can be subdivided into anionic, amphoteric, nonionic and cationic surfactants.

Cleansing formulations intended for facial cleansing require that the formulation be effective in cleansing while being mild. Therefore, only mild surfactants are included in such compositions. This means that strong surfactants such as sodium laureth sulfate are not typically included in mild facial cleansing formulations. Amino acid based surfactants are then a popular choice in providing mild cleansing formulations.

Documents CN104337734A and CN105997736A disclose various cleaning formulations comprising amino acid surfactants.

However, the fact that there are many products comprising amino acid surfactants should not mask these products still have many disadvantages.

Overall, many products containing amino acid surfactants still have poor foam quality. In particular, the total foam volume is often insufficient. Therefore, it is often necessary to add additional anionic surfactant, in particular sodium laureth sulfate, to ensure sufficient foam volume. However, this measure leads to more stringent formulations.

Thus, it remains desirable to provide cleansing formulations for human facial skin that allow higher lather volumes to be achieved while being very mild. In particular, ideally, the composition does not produce poorer skin moisture tester (corneometer) measurements on the skin than cleaning the skin with purified water.

A skin moisture tester is a measuring instrument for quantitatively determining skin moisture of an upper skin layer. It measures the capacitive ac resistance of the skin.

The applicant has surprisingly found that the above mentioned drawbacks can be solved by the present invention.

Disclosure of Invention

The present invention provides the following aspects:

a cosmetic cleaning formulation comprising

a) Sodium cocoyl glycinate, and

b) the potassium salt of the coconut oil acyl glycinate,

the method is characterized in that the weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate is 3:1 to 1: 10.

The cleaning formulation of claim 1 characterized in that the weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate is from 2:1 to 1: 4.

Item 3. the cleaning formulation according to

item

1 or 2, characterized in that the weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate is from 1:1 to 1: 2.3.

Item 4. the cleaning formulation according to any one of items 1 to 3, characterized in that the total amount of sodium cocoyl glycinate and potassium cocoyl glycinate is at least 0.5 wt. -%, preferably at least 0.8 wt. -%, preferably at least 1 wt. -%, preferably at least 2 wt. -%, most preferably at least 5 wt. -%, based on the total weight of the cleaning formulation.

Cleaning formulation according to any of items 1 to 4, characterized in that the total amount of sodium cocoyl glycinate and potassium cocoyl glycinate is below 20 wt. -%, preferably below 18 wt. -%, preferably below 15 wt. -%, most preferably below 12 wt. -%, based on the total weight of the cleaning formulation.

The cleaning formulation according to any of items 1 to 5, characterized in that the formulation comprises cocamidopropyl betaine such that the amount of cocamidopropyl betaine is preferably from 0.5 to 8 wt. -%, more preferably from 1 to 7 wt. -%, most preferably from 3 to 6 wt. -%, based on the total weight of the formulation.

Item 7. the cleaning formulation according to any of items 1 to 6, characterized in that the formulation comprises cocamide MEA such that the total amount of cocamide MEA is preferably 0.1 to 2 wt. -%, more preferably 0.2 to 1.8 wt. -%, most preferably 0.5 to 1.5 wt. -%, based on the total weight of the formulation.

Item 8. the cleaning formulation according to any of items 1 to 7, characterized in that the formulation comprises acrylate/C10-30 alkyl acrylate crosspolymers such that the total amount of acrylate/C10-30 alkyl acrylate crosspolymers is preferably from 0.1 to 2 wt. -%, more preferably from 0.2 to 1.8 wt. -%, most preferably from 0.5 to 0.9 wt. -%, based on the total weight of the formulation.

The cleaning formulation according to any of items 1 to 8, characterized in that the formulation comprises glycerol such that the total amount of glycerol is preferably from 5 to 40 wt. -%, more preferably from 15 to 37.5 wt. -%, most preferably from 25 to 35 wt. -%, based on the total weight of the formulation.

The cleaning formulation according to any of items 1 to 9, characterized in that the formulation comprises at least one emulsifier selected from steareth-20, steareth-21 and ceteth-20, such that the total amount of said emulsifier is preferably from 0.2 to 2 wt. -%, more preferably from 0.5 to 1.5 wt. -%, most preferably from 0.8 to 1.2 wt. -%, based on the total weight of the formulation.

The cleaning formulation according to claim 11, characterized in that at least ceteth-20 is included.

The cleansing formulation according to any one of claims 1 to 11, characterized in that the formulation contains phenoxyethanol such that the total amount of phenoxyethanol is preferably 0.2 to 1 wt. -%, based on the total weight of the formulation.

Item 13. the cleaning formulation according to any one of items 1 to 12, characterized in that the formulation contains polyisobutylene, such that the total amount of polyisobutylene is preferably 0.2 to 1 wt.%, based on the total weight of the formulation.

The cleaning formulation according to any of items 1 to 13, characterized in that the formulation further comprises a cationic surfactant in a total amount of less than 5 wt. -%, more preferably less than 2 wt. -%, more preferably less than 1 wt. -%, most preferably 0 wt. -%, based on the total weight of the formulation.

Cleaning formulation according to any of claims 1 to 14, characterized in that the formulation comprises sodium laureth sulfate in a total amount of less than 5 wt. -%, more preferably less than 2 wt. -%, more preferably less than 1 wt. -%, most preferably 0 wt. -%, based on the total weight of the formulation.

Use of a cleaning formulation according to any one of claims 1 to 15 for cleaning human skin.

Use of a combination of sodium cocoyl glycinate and potassium cocoyl glycinate for increasing the lather volume of a cosmetic cleansing formulation, wherein the weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate is from 3:1 to 1:10, preferably from 2:1 to 1:4, most preferably from 1:1 to 1: 2.3.

It has surprisingly been found that by combining the ingredients of the present invention, a synergistic increase in foam volume can be achieved.

The foam volume was analyzed by:

the foam volume of the formulations of the present invention was analyzed using the 10-rotation shaking method (see description below) to generate foam. For this purpose, 70ml of the solution to be analyzed (samples 1 to 13, see below) was slowly (to avoid foam formation) filled in a 1000ml measuring cylinder.

The rotary shaking method comprises the following steps:

for the rotary shaking method, the measuring cylinder is closed and then slowly adjusted to the upright position. Then the measuring cylinder is adjusted to be inverted within 1 second; within the next second, it is adjusted back to the original upright position. This vertical up/down motion was repeated for 10 cycles. The cylinder was then placed on a stationary table and the foam height was measured. This test was repeated three times for each solution concentration, and the average height was calculated and rounded.

Drawings

Figure 1 shows the foam height at different active levels in aqueous solutions of sodium cocoyl glycinate and potassium cocoyl glycinate.

Detailed Description

The following examples will illustrate the invention but are not intended to limit the invention thereto. The values in the examples are weight percentages based on the total weight of the formulation. In the case where the total of the formulations is less than 100% by weight, the content is adjusted by the water content so that the total of the formulations is 100% by weight.

For the first test, an aqueous solution of sodium cocoyl glycinate and potassium glycinate was prepared. The following table shows the prepared solutions.

The results of the foam height test are presented in the above table. The results are also presented in fig. 1.

The results show a significant and surprising increase in foam height obtained for the ratios described (see table 1).

Other exemplary compositions according to the present invention are presented in the following table.

In another set of experiments, the moisture content of the skin after application of the product of the invention was analyzed and compared to washing the skin with water only.

A panel study was conducted with 8 healthy, two sex evaluators between the ages of 20 and 40.

Research and design:

1. measurements were made at 4 test sites (3.5X 3.5cm) on the inner sides of both forearms of the volunteers. Each zone is marked with a specially designed bushing.

2. The test site was wetted with a small amount of water, 0.1g of the formulation to be tested was applied and rubbed with a finger for 10 seconds with moderate intensity.

3. Rinse with warm water (around 37-40 ℃) for 10 seconds to wash off product residues until all residues are washed off.

4. Measurements (skin moisture tester CM825, supplied by Courage + Khazaka, Germany) were performed at T0 (baseline value, before application of the product), T +10 minutes, T +20 minutes, T +1 hour, T +2 hours. The measurement is in arbitrary units. An increase indicates improved skin moisturization.

5. The average of each replicate was calculated and the difference in Ti-T0 was calculated.

The formulations analyzed in this study were pure water, example 2 and soap-based cleaning formulations as references. The results are presented in the following table:

	water (W)	Example 2	Soap-based cleanser
				Average value of Δ T0 min	0	0	0
Average value of Δ T10 min	-3.88	-3.56	-7
				Average value of Δ T20 min	-2.94	-3.94	-7.63
Average value of Δ T30 min	-3.19	-3.5	-7.63
				Average value of Δ T60 min	-3.00	-3.06	-7.31

It can be noted that example 2 appears to allow skin moisturization comparable to water. Soap-based cleansers exhibit poorer skin moisturization values.

Claims

1. A cosmetic cleaning formulation comprising

a) Sodium cocoyl glycinate, and

b) the potassium salt of the coconut oil acyl glycinate,

2. A cleaning formulation according to claim 1 characterized in that the weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate is from 2:1 to 1: 4.

3. A cleaning formulation according to any one of claims 1 to 2, characterized in that the weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate is from 1:1 to 1: 2.3.

4. A cleaning formulation according to any one of claims 1 to 3, characterized in that the total amount of sodium cocoyl glycinate and potassium cocoyl glycinate is at least 0.5 wt. -%, preferably at least 0.8 wt. -%, preferably at least 1 wt. -%, preferably at least 2 wt. -%, most preferably at least 5 wt. -%, based on the total weight of the cleaning formulation.

5. A cleaning formulation according to any one of claims 1 to 4, characterized in that the total amount of sodium cocoyl glycinate and potassium cocoyl glycinate is below 20 wt. -%, preferably below 18 wt. -%, preferably below 15 wt. -%, most preferably below 12 wt. -%, based on the total weight of the cleaning formulation.

6. A cleaning formulation according to any of claims 1 to 5, characterized in that the formulation comprises cocamidopropyl betaine such that the amount of cocamidopropyl betaine is preferably from 0.5 to 8 wt. -%, more preferably from 1 to 7 wt. -%, most preferably from 3 to 6 wt. -%, based on the total weight of the formulation.

7. A cleaning formulation according to any of claims 1 to 6, characterized in that the formulation comprises cocamide MEA such that the total amount of cocamide MEA is preferably from 0.1 to 2 wt. -%, more preferably from 0.2 to 1.8 wt. -%, most preferably from 0.5 to 1.5 wt. -%, based on the total weight of the formulation.

8. The cleaning formulation according to any one of claims 1 to 7, characterized in that the formulation comprises acrylate/C10-30 alkyl acrylate crosspolymer such that the total amount of acrylate/C10-30 alkyl acrylate crosspolymer is preferably from 0.1 to 2 wt. -%, more preferably from 0.2 to 1.8 wt. -%, most preferably from 0.5 to 0.9 wt. -%, based on the total weight of the formulation.

9. The cleaning formulation according to any one of claims 1 to 8, characterized in that the formulation comprises glycerol such that the total amount of glycerol is preferably from 5 to 40 wt. -%, more preferably from 15 to 37.5 wt. -%, most preferably from 25 to 35 wt. -%, based on the total weight of the formulation.

10. The cleaning formulation according to any one of claims 1 to 9, characterized in that the formulation comprises at least one emulsifier selected from steareth-20, steareth-21 and ceteth-20, such that the total amount of said emulsifier is preferably from 0.2 to 2 wt. -%, more preferably from 0.5 to 1.5 wt. -%, most preferably from 0.8 to 1.2 wt. -%, based on the total weight of the formulation.

11. A cleaning formulation according to claim 10, characterized in that at least ceteth-20 is comprised.

12. A cleaning formulation according to any of claims 1 to 11 characterized in that the formulation contains phenoxyethanol such that the total amount of phenoxyethanol is preferably 0.2 to 1 wt. -%, based on the total weight of the formulation.

13. The cleaning formulation according to any one of claims 1 to 12, characterized in that the formulation contains polyisobutylene, such that the total amount of polyisobutylene is preferably 0.2 to 1 wt. -%, based on the total weight of the formulation.

14. A cleaning formulation according to any of claims 1 to 13, characterized in that the formulation further comprises a cationic surfactant in a total amount of less than 5 wt. -%, more preferably less than 2 wt. -%, more preferably less than 1 wt. -%, most preferably 0 wt. -%, based on the total weight of the formulation.

15. A cleaning formulation according to any one of claims 1 to 14, characterized in that the formulation comprises sodium laureth sulfate in a total amount of less than 5 wt. -%, more preferably less than 2 wt. -%, more preferably less than 1 wt. -%, most preferably 0 wt. -%, based on the total weight of the formulation.

16. Use of a cleaning formulation according to any one of claims 1 to 15 for cleaning human skin.

17. Use of a combination of sodium cocoyl glycinate and potassium cocoyl glycinate in a weight ratio of sodium cocoyl glycinate to potassium cocoyl glycinate of from 3:1 to 1:10, preferably from 2:1 to 1:4, most preferably from 1:1 to 1:2.3, for increasing the lather volume of a cosmetic cleansing formulation.