Sulfate-free surfactant oral care compositions for improved low temperature stability

Abstract

The present invention relates to an oral care composition comprising sodium cocoyl methyl taurate, sorbitol, and purified water and having improved low-temperature stability and a sulfate-free surfactant, and more specifically, to an oral care composition having improved low-temperature stability, i.e., an oral care composition comprising sodium cocoyl methyl taurate, sorbitol, and purified water. The weight mixing ratio of sorbitol as a solvent to purified water is adjusted to 1: 0.9 to 1: 1.72, thereby improving the stability of the dosage form. The sulfate-free surfactant oral care composition for improving low-temperature stability of the present invention is characterized in that sodium cocoyl methyl taurate can be used as a surfactant, thereby providing a cleaning ingredient which forms a sulfate-free dosage form and is mild to use. In addition, the low-temperature stability at a temperature of about 5 DEG C or less is improved by adjusting the weight mixing ratio of sorbitol and purified water as a solvent.

Description

Technical Field

[0001] The present invention relates to an oral care composition containing sodium cocoyl methyl taurate, sorbitol and purified water and having improved low temperature stability and a sulfate-free surfactant, and more particularly to an oral care composition with improved low temperature stability, wherein the weight mixing ratio of sorbitol as a solvent to purified water is adjusted to 1:0.9 to 1:1.72, thereby improving the stability of the dosage form. Background Art

[0002] Existing oral care compositions generally use sulfate surfactants such as sodium lauryl sulfate (SLS). However, sulfate surfactants including sodium lauryl sulfate generally have the problem of strong irritation. Therefore, consumers have a great demand for sulfate-free dosage forms that can alleviate strong irritation and have cleaning and foaming properties.

[0003] Therefore, attempts have been made to use sodium methyl cocoyl taurate (SMTC), a mild cleaning ingredient, as a surfactant. However, when sodium methyl cocoyl taurate is applied to existing toothpaste formulations, stability problems arise under low temperature conditions, especially at temperatures below 5°C. For example, white gas may be observed in the composition or may be precipitated from the composition.

[0004] To this end, the present inventors completed the present invention in the process of studying the inclusion of sodium cocoyl methyl taurate as a surfactant and improving the stability problem at low temperatures.

[0005] Currently, Korean Authorized Patent No. 10-2337307 discloses a low-irritation oral composition comprising a glutamate surfactant and an amide propyl betaine surfactant and not comprising a sulfate surfactant, and Korean Publication Patent No. 10-2011-002669 discloses a low-irritation oral composition comprising an amide nonionic surfactant, sodium lauryl sulfate, a taurate anionic surfactant, and a betaine amphoteric surfactant, but the present invention's sulfate-free surfactant oral care composition with improved low-temperature stability comprising sodium cocoyl methyl taurate, sorbitol, and purified water has not been disclosed.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 0001: Korean Patent Authorization No. 10-2337307

[0009] Patent document 0002: Korean Patent Publication No. 10-2011-002669 Summary of the invention

[0010] The object of the present invention is to provide an oral care composition containing sodium cocoyl methyl taurate, sorbitol and purified water and having improved low temperature stability and a sulfate-free surfactant.

[0011] In order to achieve the above object, the present invention provides an oral care composition containing sodium cocoyl methyl taurate, sorbitol and purified water and having improved low temperature stability and a sulfate-free surfactant.

[0012] The oral care composition having improved low temperature stability and free of sulfate surfactants is characterized in that sodium cocoyl methyl taurate can be used as a surfactant, thereby providing a cleaning component that forms a sulfate-free dosage form and has a mild feel during use.

[0013] Furthermore, the weight mixing ratio of sorbitol and purified water as a solvent is adjusted to improve low-temperature stability at a temperature of about 5° C. or less. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The photographs are for observing the property changes of the oral care composition containing no sulfate surfactant and having improved low temperature stability prepared according to one embodiment of the present invention.

[0015] Figures 2 to 5b The photographs are for observing the property changes of the oral care composition containing no sulfate surfactant and having improved low temperature stability prepared according to an experimental example of the present invention at low temperature (5° C.). DETAILED DESCRIPTION

[0016] Hereinafter, the present invention will be described in more detail by way of examples. These examples are only used to more specifically describe the present invention, and it is obvious to those skilled in the art that the scope of the present invention is not limited to these examples according to the purport of the present invention.

[0017] The invention provides an oral care composition containing sodium cocoyl methyl taurate, sorbitol and purified water and having improved low temperature stability and a sulfate-free surfactant.

[0018] In the present invention, the sodium cocoyl methyl taurate is an anionic surfactant derived from coconut, which refers to the sodium salt component of coconut fatty acid amide of N-methyl taurine, and has good foaming, wetting, emulsifying and softness in a wide pH range, but is not limited thereto.

[0019] In the present invention, the sodium cocoyl methyl taurate may be included in an amount of 1.0 to 1.5 weight percent relative to the total weight of the composition, but is not limited thereto. In this case, when the sodium cocoyl methyl taurate is less than 1.0 weight percent, the cleaning function as a surfactant may not be fully exerted due to the low content of the surfactant, and when the sodium cocoyl methyl taurate exceeds 1.5 weight percent, there may be inconsistency with other ingredients and stability problems.

[0020] In the present invention, the sorbitol is a hexavalent alcohol obtained by reducing hexose such as glucose, and has a sweet taste similar to sugar. The sorbitol is a white crystal with flammability and hygroscopicity, has a sweet taste, is easily soluble in water or alcohol, and is commonly used in cosmetic emulsions, creams, toothpastes, food additives, synthetic raw materials for vitamin (C), sweeteners for diabetics, and diuretics. The melting point of the sorbitol is 93°C to 97.5°C, and its chemical formula can be expressed as CH2OH·(CHOH)4CH2OH.

[0021] In the present invention, the sorbitol in the oral care composition may function as a solvent, a moisturizer, and a sweetener, but is not limited thereto.

[0022] In the present invention, the weight mixing ratio of the sorbitol to the purified water may be 1:0.9 to 1:1.72, but is not limited thereto. In this case, when the weight mixing ratio of the sorbitol to the purified water is less than 0.9, the low temperature stability of the oral care composition may be reduced, and when the weight mixing ratio of the sorbitol to the purified water exceeds 1.72, the viscosity of the oral care composition may be reduced.

[0023] In the present invention, the oral care composition may further include polyethylene glycol (PEG) with a molecular weight of 500 to 5000 as a dispersion stabilizer, preferably, polyethylene glycol (PEG 1500) with a molecular weight of 1500, but not limited thereto. In this case, when the molecular weight of the polyethylene glycol is less than 500, the effect as a dispersion stabilizer is minimal, and if the molecular weight exceeds 5000, the problem of difficulty in uniform dissolution may occur when preparing toothpaste and oral care compositions.

[0024] In the present invention, relative to the total weight of the oral care composition, the polyethylene glycol may be included in an amount of 0.01 to 10 weight percent, preferably 0.1 to 5 weight percent, more preferably 1.0 to 3.0 weight percent, but is not limited thereto.

[0025] In the present invention, the viscosity of the oral care composition at 25° C. may be 800,000 cPs to 1,800,000 cPs, preferably 830,000 cPs to 1,750,000 cPs, more preferably 850,000 cPs to 1,700,000 cPs, but is not limited thereto.

[0026] In the present invention, the viscosity of the oral care composition at 5° C. may be 800,000 cPs to 1,800,000 cPs, preferably 850,000 cPs to 1,750,000 cPs, more preferably 900,000 cPs to 1,700,000 cPs, but is not limited thereto.

[0027] Hereinafter, the present invention will be described in detail based on examples. However, the following examples are only used to illustrate the present invention, and the content of the present invention is not limited to the following examples.

[0028] Preparation of oral care compositions containing sulfate-free surfactants with improved low temperature stability

[0029] Example

[0030] According to the components and contents described in Table 1, an oral care composition containing no sulfate surfactant and having improved low temperature stability was prepared. In this case, Table 2 shows the weight mixing ratio of sorbitol to purified water.

[0031] Table 1 (Unit: weight percentage)

[0032] distinguish Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Purified water 43.05 39.55 39.7 39.4 37.05 46.55 49.35 Sorbitol 35 38.5 38.5 38.5 41 31.5 28.7 Sodium Methyl Cocoyl Taurate 1.2 1.2 1.05 1.35 1.2 1.2 1.2 Polyethylene glycol 1500 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Sodium Carboxymethyl Cellulose 1.2 1.2 1.2 1.2 1.2 1.2 1.2 Silicon dioxide 14 14 14 14 14 14 14 Sodium pyrophosphate 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Sodium monofluorophosphate 0.25 0.25 0.25 0.25 0.25 0.25 0.25 Sodium fluoride 0.1 0.1 0.1 0.1 0.1 0.1 0.1 spices 2 2 2 2 2 2 2 Saccharin Sodium Hydrate 0.2 0.2 0.2 0.2 0.2 0.2 0.2

[0033] Table 2

[0034] distinguish Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Purified water / sorbitol ratio 1.23 1.03 1.03 1.02 0.90 1.48 1.72

[0035] Table 3 shows the evaluation results of appearance, viscosity at 5° C., viscosity at 25° C., foaming power, and taste preference of the oral care compositions prepared according to the ingredient contents of Examples 1 to 7 above.

[0036] On the other hand, the viscosity was measured under the conditions of RV7 pin and 1 RPM. In the appearance evaluation, the composition was stored at 5°C for 1 week to confirm whether its properties were abnormal. If the properties were changed, "X" was indicated, and if the properties were unchanged, "O" was indicated. In addition, the foaming power and taste preference evaluation were based on a 5.0-point evaluation standard, with 1 point indicating very poor and 5 points indicating very good.

[0037] The evaluation results show that the properties and viscosity of the oral care compositions of Examples 1 to 7 remain stable at low temperatures, and the evaluation results of foaming power and taste preference are good. Figure 1 As shown, the composition of Example 1 can be uniformly mixed even at low temperature without causing any change in properties.

[0038] Table 3

[0039]

[0040] Experimental Example 1. Evaluation of low temperature stability and foaming power based on the content of sodium cocoyl methyl taurate

[0041] In order to conduct this experiment, the compositions of Comparative Examples 1 and 2 were prepared. As shown in Tables 4 and 5, in the compositions of Comparative Examples 1 and 2, except for the content of sodium cocoyl methyl taurate and the ratio of purified water to sorbitol, the remaining composition contents were the same as those of Example 1.

[0042] Table 4

[0043] distinguish Comparative Example 1 Comparative Example 2 Purified water 39.85 39.15 Sorbitol 38.5 38.5 Sodium Methyl Cocoyl Taurate 0.9 1.6 Polyethylene glycol 1500 1.5 1.5 Sodium Carboxymethyl Cellulose 1.2 1.2 Silicon dioxide 14 14 Sodium pyrophosphate 1.5 1.5 Sodium monofluorophosphate 0.25 0.25 Sodium fluoride 0.1 0.1 spices 2 2 Saccharin Sodium Hydrate 0.2 0.2

[0044] (Unit: weight percentage)

[0045] Table 5

[0046] distinguish Comparative Example 1 Comparative Example 2 Purified water / sorbitol ratio 1.04 1.02

[0047] Table 6 and Figure 2 The evaluation results of the appearance, viscosity at 5°C, viscosity at 25°C, foaming power and taste preference of the compositions of Comparative Examples 1 and 2 prepared according to the contents described in Table 4 after storage at 5°C for one week are shown.

[0048] Table 6

[0049]

[0050] As shown in Table 6, although no problem was found when sodium cocoyl methyl taurate was included in an amount of 1.0 to 1.5 weight percent relative to the weight of the composition, in Comparative Example 1 including 0.9 weight percent of sodium cocoyl methyl taurate, the foaming power was evaluated as a very low score. That is, the composition of Comparative Example 1 produced almost no bubbles, so that the user could not fully feel the brushing or cleaning feeling. In addition, in Comparative Example 2 including 1.6 weight percent of sodium cocoyl methyl taurate, as shown in FIG. Figure 2 As shown, changes in properties were observed in the appearance evaluation after storage at 5°C for 1 week.

[0051] Experimental Example 2. Evaluation of low temperature stability and foaming power according to the weight mixing ratio of sorbitol and purified water estimate

[0052] In order to conduct this experiment, the compositions of Comparative Examples 3 to 5 were prepared. As shown in Tables 7 and 8, in the compositions of Comparative Examples 3 to 5, except for the content and ratio of sorbitol and purified water, the other composition contents were the same as those of Example 1.

[0053] Table 7

[0054] distinguish Comparative Example 3 Comparative Example 4 Comparative Example 5 Purified water 32.55 36.05 52.15 Sorbitol 45.5 42 25.9 Sodium Methyl Cocoyl Taurate 1.2 1.2 1.2 Polyethylene glycol 1500 1.5 1.5 1.5 Sodium Carboxymethyl Cellulose 1.2 1.2 1.2 Silicon dioxide 14 14 14 Sodium pyrophosphate 1.5 1.5 1.5 Sodium monofluorophosphate 0.25 0.25 0.25 Sodium fluoride 0.1 0.1 0.1 spices 2 2 2 Saccharin Sodium Hydrate 0.2 0.2 0.2

[0055] (Unit: weight percentage)

[0056] Table 8

[0057] distinguish Comparative Example 3 Comparative Example 4 Comparative Example 5 Purified water / sorbitol ratio 0.72 0.86 2.01

[0058] Table 9 Figure 3 as well as Figure 4 The evaluation results of the appearance, viscosity at 5°C, viscosity at 25°C, foaming power and taste preference of the compositions prepared according to the contents described in Table 7 are shown after storage at 5°C for one week.

[0059] Table 9

[0060]

[0061] When the ratio of purified water to sorbitol according to the above Examples 1 to 7 was 0.9 to 1.72, no change in properties was observed at low temperatures. Figure 3 and Figure 4 As shown in the figure, in Comparative Examples 3 and 4, where the ratio of purified water to sorbitol was 0.72 and 0.86, the evaluation results of the appearance after storage at 5°C for one week showed that changes in properties such as the generation of bubbles and white gas were observed. In addition, the composition of Comparative Example 5, where the ratio of purified water to sorbitol was 2.01, had a very low viscosity and also received low scores in the evaluation items of foaming power and taste preference.

[0062] Experimental Example 3. Effect of adding dispersion stabilizer polyethylene glycol 1500 on low temperature stability and foaming power Evaluate

[0063] In order to conduct this experiment, a composition of Comparative Example 6 was prepared. As shown in Tables 10 and 11, in the composition of Comparative Example 6, the remaining components were the same as those of Example 4 except for whether polyethylene glycol 1500 was added as a dispersion stabilizer and the weight mixing ratio of sorbitol and purified water.

[0064] Table 10

[0065]

[0066]

[0067] (Unit: weight percentage)

[0068] Table 11

[0069] distinguish Comparative Example 6 Purified water / sorbitol ratio 1.06

[0070] Table 12 Figure 5a and 5b The appearance, viscosity at 5° C., viscosity at 25° C., foaming power, taste preference, and foaming power evaluation results of the compositions prepared according to the contents described in Table 10 are shown.

[0071] Table 12

[0072]

[0073] As shown in Table 12, although no problem was found when polyethylene glycol 1500 was added as a dispersion stabilizer, in Comparative Example 6 in which polyethylene glycol 1500 was not added as a dispersion stabilizer, Figure 5a and 5b As shown in the figure, at a low temperature of 5°C, the properties changed, the viscosity was lower, and the score obtained in the foaming power evaluation was also lower. Figure 5a This is a photograph showing the appearance of the composition of Comparative Example 6 after being stored at 5°C for one week. Figure 5b To enlarge Figure 5a The lower right part of the photo.

[0074] The embodiments of the present invention are described in detail above so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in many different implementations, and the present invention is not limited to the embodiments described herein.

Claims

1. An oral care composition containing a sulfate-free surfactant and improved low temperature stability, characterized in that: include: Sodium methyl cocoyl taurate, sorbitol and purified water.

2. The oral care composition containing sulfate-free surfactant and having improved low temperature stability according to claim 1, characterized in that: Relative to the total weight of the composition, the sodium cocoyl methyl taurate is contained in an amount of 1.0 weight percent to 1.5 weight percent.

3. The oral care composition containing sulfate-free surfactant and having improved low temperature stability according to claim 1, characterized in that: The weight mixing ratio of the sorbitol to the purified water is 1:0.9 to 1:1.

72.

4. The oral care composition containing sulfate-free surfactant and having improved low temperature stability according to claim 1, characterized in that: The oral care composition further comprises polyethylene glycol having a molecular weight of 500 to 2500.

5. The oral care composition containing sulfate-free surfactant and having improved low temperature stability according to claim 4, characterized in that: Relative to the total weight of the composition, the polyethylene glycol is contained in an amount of 0.01 weight percent to 10 weight percent.

6. The oral care composition containing sulfate-free surfactant and having improved low temperature stability according to claim 1, characterized in that: Under the temperature condition of 25° C., the viscosity of the oral care composition is 800,000 cPs to 1,800,000 cPs.

7. The oral care composition containing sulfate-free surfactant and having improved low temperature stability according to claim 1, characterized in that: Under the temperature condition of 5° C., the viscosity of the oral care composition is 800,000 cPs to 1,800,000 cPs.

Images