KR100678790B1 - Oil in water emulsion cosmetic compositions for blocking ultraviolet - Google Patents

Abstract

An oil-in-water type emulsified cosmetic composition for blocking UV is provided to be able to maintain the long term emulsion stability at high temperature, and show excellent feeling of use by adding a surfactant and a high fatty alcohol into a composition containing a polycaprolactone-polyethyleneglycol(PCL-PEG) copolymer and a UV blocking agent. The oil-in-water type emulsified cosmetic composition for blocking UV comprises 0.2-2.0 wt.% of a PCL-PEG copolymer, 0.5-2.0 wt.% of a surfactant such as alkyl glucoside surfactant, 0.5-3.0 wt.% of a high fatty alcohol such as a C12-22 fatty alcohol, and 0.5-10.0 wt.% of a UV blocking agent. In the composition, the blocking agent comprises 1.0-7.0 wt.% of octylmethoxy cinnamate and 0.5-3.0 wt.% of isoamyl-p-methoxy cinnamate.

Description

Oil in water emulsion cosmetic compositions for blocking ultraviolet}

The present invention relates to an oil-in-water emulsion cosmetic composition that is stable even at high temperatures, and more particularly, to an oil-in-water emulsion containing a polycaprolactone-polyethylene glycol copolymer (hereinafter referred to as "PCL-PEG copolymer") and a sunscreen agent. It relates to improving the formulation stability of the cosmetic composition.

Emulsion refers to a liquid / liquid dispersion system in which one or more other liquid phases that are not mixed in one liquid phase are dispersed. In the case of a simple emulsion consisting of an aqueous phase and an oleic phase, oil-in-water when the oil phase is a discontinuous phase and the aqueous phase has a continuous phase structure It is called a type emulsion. In contrast, when the water phase has a structure in which a discontinuous phase and an oil phase is a continuous phase, it is called a water-in-oil emulsion. The stability, rheological properties, and texture of the emulsion produced are the physical properties of each component of the oil / water / surfactant system of the emulsion and the miscibility between them. The gap is mainly determined by the nature of the OW interface.

Since emulsions are a metastable system from a thermodynamic point of view, surfactants must be used to lower the interfacial energy of the newly created O-W interface to maintain dispersion. Such a surfactant is usually an amphiphilic substance having both a hydrophilic portion and a lipophilic portion in a molecule.

Adsorption at the water / oil interface lowers the energy of the interface and effectively prevents ostwald ripening, coagulation, coalescence, creaming and sedimentation of the dispersed phase droplets. Various kinds of surfactants (nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants) are used to maintain the structure, and stabilization studies using colloidal particles (BP Binks, Current Opinion in Colloid & Interface). Science (2002) 7, 21-41; BP Binks and JH Clint, Langmuir (2002) 18, 1270-1273; BP Binks and SO Lumsdon, Langmuir (2000) 16, 3748-3756, etc.) and self-emulsifying double blocks Emulsion of emulsion using amphiphilic polymer such as copolymer, polysiloxane-polyoxyalkylene copolymer, ethylene oxide and propylene oxide block copolymer, PCL-PEG block copolymer, PCL-PEO-PCL triblock copolymer Chemistry studies have been carried out continuously.

Emulsions stabilized using amphiphilic polymers are expected to be used in cosmetics and medicines in that they can lower skin irritation because they have low skin permeability due to their high molecular weight compared to conventional surfactants. do.

In particular, when the emulsion is prepared using polycaprolactone-polyethylene glycol, the emulsion polymer is stabilized by forming a rigid polymer thin film at the interface between oil and water, and thus there is no problem in using it at room temperature as a cosmetic.

However, when the consumer is likely to be left at a high temperature temporarily or in the long term, such as a sunscreen cosmetics, there was a problem that the emulsion stability worsens.

Accordingly, the present inventors have found that the emulsion stability is improved at high temperatures when the surfactant and the higher aliphatic alcohol are added to the oil-in-water emulsion-containing cosmetic composition containing a PCL-PEG copolymer and a sunscreen, thereby completing the present invention.

Accordingly, an object of the present invention is to contain a PCL-PEG copolymer, a surfactant, a higher aliphatic alcohol, and a sunscreen, so that even at high temperature (50 ° C or more), long-term (more than 3 months) water phase and oil phase separation do not occur. It is to provide an oil-in-water emulsion for sun protection .

In order to achieve the above object, the oil-in-water emulsion cosmetic composition for sunscreen according to the present invention is 0.2 to 2.0% by weight of polycaprolactone-polyethylene glycol (PCL-PEG) copolymer, 0.5 to 2.0% by weight surfactant, higher aliphatic 0.5 to 3.0% by weight of alcohol, and 0.5 to 10.0% by weight of a sunscreen.

In the oil-in-water type emulsion cosmetic composition for sunscreen according to the present invention, the polycaprolactone-polyethylene glycol copolymer has a molar ratio of polycaprolactone: polyethylene glycol is 0.5: 1 to 12: 1, the molecular weight is 1,500 to 60,000 Daltons It is preferable.

In the oil-in-water emulsion cosmetic composition for sunscreen according to the present invention, the surfactant is preferably an alkyl glucoside surfactant.

In the oil-in-water emulsion cosmetic composition for sunscreen according to the present invention, the higher aliphatic alcohol is preferably an aliphatic alcohol having 12 to 22 carbon atoms.

In the oil-in-water emulsion cosmetic composition for sunscreen according to the present invention, it is preferable to contain 1.0 to 7.0% by weight of octylmethoxycinnamate and 0.5 to 3.0% by weight of isoamyl-p-methoxycinnamate as the sunscreen. .

Hereinafter, the present invention will be described in more detail.

PCL-PEG copolymer used in the oil-in-water emulsion cosmetic composition for sun protection of the present invention can be prepared using a ring-opening polymerization (well-opening polymerization) generally known in the Republic of Korea Patent Application No. 2003-0075057 See method described).

In addition, it is usually preferred to use a block copolymer having a molar ratio of PCL-PEG copolymer raw material, such as PCL and PEG, in the range of 0.5: 1 to 12: 1, more preferably PCL-PEG, suitable for use in cosmetics. Block copolymers having a molar ratio of PEG of 1: 1 can be used. In addition, the amphiphilic copolymer consisting of the polycaprolactone and polyethylene glycol is preferably a molecular weight of 1,500 to 60,000 Daltons. It is not stable when the molar ratio of PCL and PEG is not in the range of 0.5: 1 to 12: 1 or when the molecular weight of the copolymer is not in the range of 1,500 to 60,000 Daltons, even if an emulsion is not formed. Because it will be good.

The content of the PCL-PEG copolymer in the oil-in-water emulsion cosmetic composition for sunscreen is preferably 0.2-2.0% by weight, which is less than 0.2% by weight of the PCL-PEG copolymer is not expected to emulsify as well as PCL- It is difficult to expect the advantages in terms of safety and usability by the PEG copolymer, and it is not suitable since the stability of the emulsion is not improved at more than 2.0% by weight.

The surfactant used in the oil-in-water type emulsion cosmetic composition for sunscreen of the present invention is preferably an alkyl glucoside surfactant, and can be obtained by condensation reaction of a higher aliphatic alcohol having a glucose functional group. The alkyl group of the higher aliphatic alcohol includes a lauryl group, cetyl group, stearyl group, behenyl group, myristyl group, cetostearyl group and the like according to carbon number.

Therefore, the alkyl glucoside surfactant of the present invention may be used cetostearyl glucoside, arachidyl glucoside, lauryl glucoside, myristyl glucoside, cetyl glucoside, stearyl glucoside. Preferably C _12-20 alkyl glucosides can be used.

The concentration of the alkyl glucoside surfactant in the oil-in-water emulsion cosmetic composition for sunscreen is preferably 0.5 to 2.0% by weight. It is not desirable that the surfactant improves the stability of the emulsion composition at less than 0.5% by weight, and if it is more than 2.0% by weight, it is stiff at the time of application and remains sticky after application, resulting in poor feeling of use, which is not suitable for cosmetics. Because.

The higher aliphatic alcohol used in the oil-in-water emulsion cosmetic composition for sunscreen of the present invention is condensation reaction by adding methanol to various origin materials present in the form of glycerol ester to obtain fatty alcohol methyl ester. It can be obtained by adding condensation reaction to water.

The higher aliphatic alcohol is preferably an aliphatic alcohol having 12 to 22 carbon atoms. The higher the number of carbon atoms of higher aliphatic alcohols, the more lipophilic. If the carbon number is less than 12, the affinity with the skin is less suitable for inclusion in the cosmetic composition. Due to their difficult supply in form, the higher aliphatic alcohols were limited to 12-22 carbon atoms.

Various origin materials present in the glycerol ester form include, for example, palm oil, soy bean oil, rapeseed oil, and the like.

The content of the higher aliphatic alcohol in the oil-in-water emulsion cosmetic composition for sunscreen is preferably 0.5 to 3.0% by weight. This is because less than 0.5% by weight contributes to the stability of emulsification, and more than 3.0% by weight when applied to the skin appears to be a stiff feeling is not suitable as a cosmetic.

The content of the sunscreen used in the sunscreen oil-in-water emulsion cosmetic composition of the present invention is preferably 0.5 to 10.0% by weight, more preferably 1.0-7.0% by weight of octylmethoxycinnamate and isoamyl-p-methoxy Cinnamate 0.5-3.0% by weight. When the concentration is less than the concentration of the sunscreen is insufficient, it can not function as a cosmetic composition for the sunscreen, can not play a role of dissolving the PCL-PEG copolymer, and when above each concentration will cause irritation to the skin This is because there is a possibility and the smell of the raw material is unsuitable for the user's taste when the final cosmetic composition is applied to the skin.

It is preferable to use the oil-in-water emulsion cosmetic composition for sunscreen of this invention as an emulsion, cream, etc., for example.

Hereinafter, the configuration and effects of the present invention will be described in more detail with reference to the following Examples and Experimental Examples. However, the above examples are illustrated to aid the understanding of the present invention, and the present invention is not limited only to these examples.

[Examples 1 and 2 and Comparative Examples 1 to 4]

In Examples 1 and 2 and Comparative Examples 1 to 4, an oil-in-water emulsion cosmetic composition (a creamy emulsion) for blocking UV rays was prepared using the components and contents (wt%) of Table 1, respectively. At this time, Examples 1 and 2 in the following Table 1, respectively, showing the oil-in-water emulsion cosmetic composition for UV protection of a preferred configuration according to the present invention, PCL-PEG copolymer, alkyl glucoside as a surfactant, higher aliphatic alcohol is 0.2 When mixed in the range of -2.0 wt%, 0.5-2.0 wt% and 0.5-3.0 wt%. Comparative Example 1 is an example in which only PCL-PEG copolymer and higher aliphatic alcohol is used for emulsification without using alkyl glucoside as a surfactant, and Comparative Example 2 is an example in which no higher aliphatic alcohol is used, and Comparative Example 3 is PCL- The PEG copolymer was used in an amount exceeding the range of 0.2-2.0% by weight, and Comparative Example 4 is an example in which only alkyl glucoside and higher aliphatic alcohol, which are surfactants, were used for emulsification without using a PCL-PEG copolymer.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Octylmethoxycinnamate 5.0 5.0 5.0 5.0 5.0 5.0 2.Isoamyl-p-methoxycinnamate 2.0 2.0 2.0 2.0 2.0 2.0 3.Dicaprylyl carbonate 5.0 5.0 5.0 5.0 5.0 5.0 4.PCL-PEG copolymer (molar ratio of PCL: PEG = 1: 1, molecular weight 5,000 Daltons 1.0 1.0 1.0 1.0 3.0 - 5. alkyl glucosides (C _{12 -20} alkyl glucoside) 1.5 1.0 - 1.5 1.0 2.0 6.Cetostearyl alcohol 1.0 0.5 1.0 - 1.0 1.0 7.Behenyl alcohol 1.0 0.5 1.0 - 1.0 1.0 8.Cyclomethicone 5.0 5.0 5.0 5.0 5.0 1.0 9.Titanium oxide 1.0 1.0 1.0 1.0 1.0 1.0 10.Methylparaben 0.2 0.2 0.2 0.2 0.2 0.2 11.Propylparaben 0.1 0.1 0.1 0.1 0.1 0.1 12 D.I.Water To 100 To 100 To 100 To 100 To 100 To 100 13.Disodium IDT (EDTA 2Na) 0.02 0.02 0.02 0.02 0.02 0.02 14.Butylene glycol 5.0 5.0 5.0 5.0 5.0 5.0 15.Carbomer 0.2 0.2 0.2 0.2 0.2 0.2 16.Fragrance Quantity Quantity Quantity Quantity Quantity Quantity

According to the weight percent shown in Table 1, the oil phase parts (raw materials 1-11) were dissolved in a separate container by heating at 70 ° C., and then dispersed using a homogenizer to prepare a lipophilic mixture. The aqueous part (raw material 12-14) was then dissolved by heating to 70 ° C., and the lipophilic mixture prepared above was added thereto, followed by oil-in-water emulsification at 70 ° C. for 4-5 minutes using a homogenizer. To this was added a thickener such as carbomer and an appropriate amount of flavor and mixed using a homogenizer for 3 minutes. Thereafter, air bubbles in the emulsion were removed using a degassing apparatus, the emulsion was filled in an airtight container, and then cooled to room temperature using a cooling unit to prepare a creamy oil-in-water emulsion cosmetic composition for blocking the cream. .

[Comparative Examples 5 and 6]

In Comparative Examples 5 and 6, the oil-in-water emulsion cosmetic composition for sunscreen was prepared in the same manner as in Examples 1 and 2 and Comparative Examples 1 to 4 using the components and contents (wt%) of Table 2, respectively (creamy emulsion). At this time, in Table 2, Comparative Example 5 is an example of using an alkyl glucoside as a surfactant of 0.5-2.0% by weight or more, Comparative Example 6 is an example of using a higher aliphatic alcohol in 0.5-3.0% by weight or more.

Comparative Example 5 Comparative Example 6 Octylmethoxycinnamate 5.0 5.0 2.Isoamyl-p-methoxycinnamate 2.0 2.0 3.Dicaprylyl carbonate 5.0 5.0 4.PCL-PEG copolymer (molar ratio of PCL: PEG = 1: 1, molecular weight 5,000 Daltons) 1.0 1.0 5. alkyl glucosides (C _{12 -20} alkyl glucoside) 3.0 1.5 6.Cetostearyl alcohol 1.0 2.0 7.Behenyl alcohol 1.0 2.0 8.Cyclomethicone 5.0 5.0 9.Titanium oxide 1.0 1.0 10.Methylparaben 0.2 0.2 11.Propylparaben 0.1 0.1 12 D.I.Water To 100 To 100 13.Disodium IDT (EDTA 2Na) 0.02 0.02 14.Butylene glycol 5.0 5.0 15.Carbomer 0.2 0.2 16.Fragrance Quantity Quantity

 [Experimental Example 1 Comparison of Emulsification Stability in Long-term Storage at High Temperature]

In Experimental Example 1, the high temperature stability of each sample prepared in Examples 1 and 2 and Comparative Examples 1 to 4 was observed at 50 ° C. for 3 months. Stability was visually observed at 1 week, 2 weeks, 1 month, 2 months, 3 months after sample storage, and the results are shown in Table 3 below.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 1 week later ○ ○ ○ ○ ○ ○ after 2 weeks ○ ○ ○ ○ ○ ○ 1 month later ○ ○ △ △ ○ ○ 2 months later ○ ○ △ △ ○ ○ 3 months later ○ ○ X △ △ △

(Circle): Separation of the oil phase and the water phase was not confirmed at all.

(Triangle | delta): Slight separation | separation of the oil phase and the water phase was confirmed.

X: Remarkable separation of the oily water phase was confirmed.

As a result, as shown in Table 3, the separation of the oil phase and the water phase was confirmed until 3 months later in the case of Example 1 and Example 2 containing PCL-PEG copolymer, alkyl glucoside which is a surfactant, and a higher aliphatic alcohol. However, as shown in Comparative Examples 1 and 2, the separation of the oil phase and the water phase was confirmed after 2 weeks in the absence of alkyl glucoside or higher aliphatic alcohol, and in this case, Comparative Example 1 containing no alkyl glucoside as surfactant. In that case, the degree was more serious. In addition, when the content of the PCL-PEG copolymer exceeds 0.2 to 2.0% by weight (Comparative Example 3), when only the alkyl glucoside and the higher aliphatic alcohol is used without the PCL-PEG copolymer (Comparative Example 4 2 weeks later, the separation of the aqueous phase and the oil phase was confirmed.

Through this, the PCL-PEG copolymer, alkyl glucoside, and higher aliphatic alcohol, both surfactants, affect the high temperature stability of the oil-in-water emulsion cosmetic composition for sunscreen, and in particular, the alkyl glucoside, surfactant, is used to improve stability. It was found to have a greater impact.

[Experimental Example 2 Comparison of Usability According to Composition of Alkyl Glucoside Surfactant and Higher Aliphatic Alcohol in UV-Protective Cosmetics

In Experimental Example 2, each sample obtained in Examples 1 and 2, Comparative Example 1, and Comparative Examples 3 to 6 was used to evaluate the feeling of use using a panel consisting of 20 women, 25-40 years old, and the results are as follows. Table 4 shows. At this time, the evaluation items were measured to measure the applicability and adhesion feeling applied during the application, and the evaluation was performed in units of 1 to 5 points. (4 points) and very good (5 points). Table 4 below shows the average score evaluated by the panel up to the first decimal place (rounded up from the second digit).

Example 1 Example 2 Comparative Example 1 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Application 4.3 4.2 2.8 2.7 3.3 3.1 2.1 Tightness 4.5 4.0 3.2 2.9 3.0 3.2 3.5

As a result, as shown in Table 4, when comparing the feeling of use of Examples 1 and 2 with Comparative Examples 1, 3 to 6, PCL-PEG copolymer, alkyl glucoside surfactant, higher aliphatic alcohol is 0.2 It was found that the feeling of Example 1 and Example 2 was the most excellent when mixed in the range of -2.0% by weight, 0.5-2.0% by weight and 0.5-3.0% by weight.

As described above, the oil-in-water emulsion cosmetic composition for sunscreen according to the present invention is added to the oil-in-water emulsion cosmetic composition containing a PCL-PEG copolymer and a sunscreen by adding an alkyl glucoside surfactant and a higher aliphatic alcohol, even at high temperatures. Emulsification stability is maintained for a long time, and also excellent in feeling, it can be usefully used as an oil-in-water emulsion cosmetic composition for UV protection.

Claims (5)

Polycaprolactone-polyethylene glycol (PCL-PEG) copolymer 0.2 to 2.0% by weight, 0.5 to 2.0% by weight surfactant, 0.5 to 3.0% by weight of higher aliphatic alcohol, 0.5 to 10.0% by weight of sunscreen Oil-in-water emulsion cosmetic composition for sunscreen. The method of claim 1, wherein the polycaprolactone-polyethylene glycol copolymer is a polycaprolactone: polyethylene glycol molar ratio of 0.5: 1 to 12: 1, the molecular weight of 1,500 to 60,000 Daltons in oil-in-water type Emulsifying Cosmetic Composition. The oil-in-water type emulsion cosmetic composition for sunscreen according to claim 1, wherein the surfactant is an alkyl glucoside surfactant. The oil-in-water type emulsion cosmetic composition according to claim 1, wherein the higher aliphatic alcohol is a C12-C22 aliphatic alcohol. The oil-in-water type emulsion cosmetic composition for sunscreen according to claim 1, wherein the sunscreen agent contains 1.0-7.0 wt% of octylmethoxycinnamate and 0.5-3.0 wt% of isoamyl-p-methoxycinnamate. .