KR102575094B1 - Oil-in-water type cosmetic composition with a low viscosity comprising a high content of oil - Google Patents

Abstract

The present invention relates to an oil-in-water cosmetic composition in which a high content of oil is stabilized at low viscosity, and more particularly, a general cosmetic composition without a process requiring special equipment by using polyaspartic acid grafted with octadecylamine as an emulsifier. It relates to a low-viscosity oil-in-water cosmetic composition in which a high content of oil is stabilized by a manufacturing process of.

Description

Oil-in-water type cosmetic composition with a low viscosity comprising a high content of oil}

The present invention relates to an oil-in-water cosmetic composition in which a high content of oil is stabilized at low viscosity, and more particularly, a general cosmetic composition without a process requiring special equipment by using polyaspartic acid grafted with octadecylamine as an emulsifier. It relates to a low-viscosity oil-in-water cosmetic composition in which a high content of oil is stabilized by a manufacturing process of.

A cosmetic composition with a surfactant-free oil-in-water (O/W) formulation can deliver the feeling of use of the oil itself, which provides effects such as skin moisturizing and skin softening, and prevents irritation caused by surfactants. There are many advantages to being able to do it. However, surfactant-free cosmetics have not been developed much in skin care products due to freezing safety and formulation stability, and the situation is limited to emulsifying a small amount of oil.

On the other hand, by using amphiphilic polymers, cationic surfactants (quaternary ammonium, amine salt-based, etc.), anionic surfactants (carboxylate, sulfonate, sulfate, phosphate-based, etc.), non-amphiphilic polymer surfactants, etc. Formulations such as lotions and creams in which emulsions containing a large amount of oil are stabilized without containing surfactants such as ionic surfactants (PEG, sugars, polyglyceryl, sorbitan, etc.) have been developed. However, these formulations are high-viscosity formulations, and O/W emulsion formulations with low viscosity of 2000 cps or less and high oil content, such as skin and essence, have not been developed, and even if they contain high oil content, Usually only about 10% of the oil is stabilized.

In addition, the technology developed so far to stabilize high-content oil in a low-viscosity formulation requires special equipment and methods such as a high-pressure emulsifier, resulting in a complicated and expensive manufacturing process.

Therefore, there is still a need for an oil-in-water formulation in which a high content of oil is stabilized with a low viscosity while the manufacturing process is simple.

1. Korean Patent Publication No. 2000-0023142 (published on April 25, 2000) 2. Japanese Patent Laid-Open No. 2014-205628 (published on October 30, 2014)

Accordingly, the present inventors found that a high content of oil can be stabilized at a low viscosity by using a polyaspartic acid grafted with octadecylamine as a polymer emulsifier in a general manufacturing process of an oil-in-water composition without a process requiring special equipment, , which led to completion of the present invention.

Accordingly, an object of the present invention is to provide an oil-in-water cosmetic composition in which a high content of oil is stabilized at a low viscosity by using specific polyaspartic acid as a polymer emulsifier.

In order to achieve the above object, the present invention provides a low-viscosity oil-in-water cosmetic composition containing octadecylamine-grafted polyaspartic acid as a polymer emulsifier and stabilizing 15 to 36% by weight of oil.

In the composition of the present invention, by using polyaspartic acid grafted with octadecylamine as a polymer emulsifier, it is possible to implement a high-content oil into a low-viscosity formulation, and also, without going through a separate special facility or process, conventional water It is possible to manufacture by a general manufacturing process of a tangible cosmetic composition.

1 is a microscopic observation of the particle state after storage at 45 ° C. for 4 weeks immediately after preparation of Example 1.
Figure 2 shows the state immediately after preparation of the composition of Comparative Example 2.
Figure 3 shows the state of the next day after preparation of the composition of Example 1 and Comparative Example 6.

The cosmetic composition according to the present invention relates to an oil-in-water emulsion cosmetic composition in which a high content of oil is stabilized at low viscosity.

The cosmetic composition of the present invention contains poly(aspartic acid grafted with octadecylamine; MW = 9000; Mw/Mn = 1.4 (Mw: weight average molecular weight, Mn: number average molecular weight)) is used as a polymer emulsifier. By using the amphiphilic properties of the polyaspartic acid grafted with octadecylamine, high oil content can be easily stabilized, and special equipment such as a high-pressure emulsifier can be used. And it is possible to stabilize a high content of oil in a low-viscosity formulation by a general process of manufacturing an oil-in-water composition without going through a process, so that the production process is simple and the manufacturing cost can be reduced.

The cosmetic composition according to the present invention contains octadecylamine-grafted polyaspartic acid as a polymer emulsifier in an amount of 1 to 3% by weight, preferably 1.8 to 3% by weight, based on the total weight of the composition. If the content is less than 1% by weight, a high content of oil of 30% by weight or more cannot be stabilized in an emulsion state, on the other hand, even if the content exceeds 3% by weight, the effect of stabilizing the emulsion (emulsion particles) does not increase anymore The viscosity of the composition also increases, making it impossible to implement a low-viscosity formulation having a viscosity of 2000 cps or less.

The cosmetic composition according to the present invention contains a high amount of oil, specifically 15 to 36% by weight, preferably 30 to 36% by weight, more specifically 30 to 32% by weight of oil based on the total weight of the composition . Even compositions that normally contain a high oil content, although typically only about 10% oil by weight, the compositions of the present invention can stably contain much larger amounts of oil than conventional compositions.

In the present invention, the type of stabilizeable oil is not particularly limited as long as it is commonly used in the preparation of oil-in-water cosmetic compositions, but does not include those that are solid at room temperature, such as butter and wax.

Oils that may be included in the composition of the present invention may include, for example, silicone oil, ester oil, hydrocarbon oil, and mixtures thereof.

The silicone oil is dimethicone, cyclomethicone, polydimethylsiloxane, methylphenylpolysiloxane, methylcyclopolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, tetradecamethylhexasiloxane and octamethyltri It may be one or more selected from the group consisting of siloxane, but is not limited thereto.

The ester oil is triethylhexanoin, cetylethylhexanoate, cetyloctanoate, cetylisooctanoate, octyldodecylmyristate, pentaerythrityltetraethylhexanoate, isopropyl palmitate, isopropyl myristate. It may be at least one selected from the group consisting of state, caprylic/capric triglyceride, butylene glycol dicaprylate/dicaprate, tocopherol acetate, and dicaprylic carbonate, but is not limited thereto.

The hydrocarbon-based oil may be at least one selected from the group consisting of paraffin, ceresin, and microcrystalline wax, but is not limited thereto.

The cosmetic composition according to the present invention is characterized in that it is a fluid type having a viscosity as low as 2000cps or less. In general, formulations containing an amphiphilic raw material are high-viscosity formulations in the form of a cream, but in the present invention, it is possible to implement a low-viscosity formulation while using the amphiphilic properties of polyaspartic acid grafted with octadecylamine.

The cosmetic composition according to the present invention may contain appropriate amounts of auxiliary ingredients such as pigments, fragrances, preservatives, and thickeners commonly included in the preparation of oil-in-water, preferably in an amount of 0 to 20% by weight based on the total weight of the composition. may contain

The cosmetic composition according to the present invention is not particularly limited in its formulation, but considering its low viscosity, basic cosmetic compositions such as softening lotion, nutrient lotion, gel, and lotion; cosmetic compositions for hair such as hair growth agents such as hair tonic, hair essence or hair treatment; It can be widely applied to other pharmaceuticals and quasi-drugs.

Hereinafter, the configuration and effects of the present invention will be described in more detail by way of test examples and manufacturing examples. However, these test examples and preparation examples are provided only for illustrative purposes to aid understanding of the present invention, and the scope and scope of the present invention are not limited by the following examples.

[Reference Example 1]

The oil-in-water emulsions of Examples and Comparative Examples were prepared according to the following manufacturing method with the compositions shown in Tables 1 and 2, respectively.

Example One 2 3 4 5 you
award
green onion
crack oily ingredients squalane 5 6 6 6 6 Cetyl 2-ethyl hexanoate 5 6 6 6 6 Caprylic/Capric Triglyceride 5 6 6 5 6 Pentaerythrityl Tetraethylhexanoate 5 6 6 5 6 methyl trimethicone 5 6 6 5 6 PCA Dimethicone 5 6 6 5 6 emulsifier Polyglyceryl-3 Methylglucose Distearate - - - - - Glyceryl Stearate*PEG-100 Stearate - - - - - number
award
green onion
crack water To 100 To 100 To 100 To 100 To 100 emulsifier PAsp-g-C18 One 2 3 One 1.8 Cetearyl Olivate*Sorbitan Olivate - - - - - Hydrogenated Lecithin - - - - - etc glycerin 4 4 4 4 4 propanediol 6 6 6 6 6 carbomer 0.2 0.2 0.2 0.2 0.2 Acrylates/C10-30 Alkyl Acrylate Crosspolymer 0.15 0.15 0.15 0.15 0.15 tromethamine 0.18 0.18 0.18 0.18 0.18

* PAsp-g-C18: polyaspartic acid grafted with octadecylamine

comparative example One 2 3 4 5 6 7 8 9 you
award
green onion
crack oily ingredients squalane 5 5 5 5 5 8 8 5 8 Cetyl 2-ethyl hexanoate 5 5 5 5 5 8 8 5 8 Caprylic/Capric Triglyceride 5 5 5 5 5 6 6 5 6 Pentaerythrityl tetraethylhexanoate 5 5 5 5 5 6 6 5 6 methyl trimethicone 5 5 5 5 5 6 6 5 6 PCA Dimethicone 5 5 5 5 5 6 6 5 6 emulsifier Polyglyceryl-3 Methylglucose Distearate - One - - - - - - - Glyceryl Stearate*PEG-100 Stearate - - One - - - - - - number
award
green onion
crack water To 100 To 100 To 100 To 100 To 100 To 100 To 100 To 100 To 100 emulsifier PAsp-g-C18 - - - - - One 3 0.5 4 Cetearyl Olivate*Sorbitan Olivate - - - One - - - - - Hydrogenated Lecithin - - - - One - - - - etc glycerin 4 4 4 4 4 4 4 4 4 propanediol 6 6 6 6 6 6 6 6 6 carbomer 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Acrylates/C10-30 Alkyl Acrylate Crosspolymer 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 tromethamine 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18 0.18

* PAsp-g-C18: polyaspartic acid grafted with octadecylamine

<Production method> - Examples 1 to 5 and Comparative Examples 1, 6 to 9

1) A water phase part is prepared by mixing and dissolving the water phase part raw materials in Table 1 at room temperature.

2) In a separate container, the oil phase part raw materials in Table 1 are mixed and dissolved at room temperature to prepare an oil phase part.

3) A cosmetic composition is prepared by adding the oil phase part of step 2) to the water phase part of step 1) and stirring and mixing with a homomixer.

<Production method> - Comparative Examples 2 to 5

1) The water phase part of Table 1 is mixed with the emulsifier and dissolved at 70 ° C to prepare the water phase part.

2) The oil phase part raw materials of Table 1 are mixed and dissolved at 70 ° C to prepare an oil phase part.

3) The oil phase part of step 2) is added to the aqueous phase part of step 1) and mixed by stirring with a homomixer.

4) Add other raw materials for the water phase part to the mixture of 3), stir with a homomixer, and then cool to 30 ° C to prepare a cosmetic composition.

[Test Example 1] Viscosity measurement of the composition

The viscosity of the compositions of Examples 1 to 5 and Comparative Examples 1 to 9 prepared in Reference Example 1 was measured using a Brookfield Viscometer under conditions of 64 spindle, 12 rpm, and 2 min.

The measurement results are shown in Table 3 below.

Example comparative example One 2 3 4 5 One 2 3 4 5 6 7 8 9 viscosity
(cps) 1100 1400 1500 1100 1400 n.d n.d 6500 n.d n.d 1400 1900 n.d 1900

n.d: not measurable

As shown in Table 3, Examples 1 to 5 and Comparative Examples 6 to 9 including polyaspartic acid (Pasp-g-C18) grafted with octadecylamine according to the present invention as an emulsifier had a viscosity of 2000 cps or less. In the case of Comparative Examples 1 to 5, which do not contain Pasp-g-C18 and include an emulsifier that has been widely used in the past, while prepared as a low-viscosity composition, when preparing a composition containing a high oil content, In comparison, it exhibited a significantly higher degree of viscosity, or it was separated immediately after preparation, and the viscosity of the composition could not be measured.

[Test Example 2] Measurement of stability over time of composition

Aging stability was observed for the compositions of Examples 1 to 5 and Comparative Examples 1 to 9 prepared in Reference Example 1.

Specifically, the separation of the oil phase part and the water phase part of the composition was observed while storing the composition in a 45° C. chamber for 4 weeks.

The observation results are shown in Table 4 and Figures 1 to 3 below.

Example comparative example One 2 3 4 5 One 2 Aging stability
(45℃, 4 weeks) stability stability stability stability stability Isolation immediately after manufacture Isolation immediately after manufacture comparative example 3 4 5 6 7 8 9 Aging stability
(45℃, 4 weeks) Separation after 1 day Isolation immediately after manufacture Isolation immediately after manufacture Separation after 1 day Separation after 2 days Isolation immediately after manufacture Separation after 2 days

As shown in Table 4 and FIG. 1, Examples 1 to 5, which are compositions according to the present invention, have a low viscosity of less than 2000cps even though they contain hydrocarbon-based oil, ester-based oil, and silicone oil in a high content of 30% by weight or more. On the other hand, in Comparative Example 1, which did not contain an emulsifier, separation occurred immediately after preparation, and an emulsifier, which was widely used in the past, was used instead of octadecylamine-grafted polyaspartic acid. Including Comparative Examples 2 to 5, separation occurred immediately after preparation or was separated the next day (see FIG. 2). Figure 2 shows the state immediately after preparation of the composition of Comparative Example 2, but the compositions of Comparative Examples 1 and 3 to 5 also showed a similar separation tendency immediately after preparation or the next day.

In addition, even when polyaspartic acid grafted with octadecylamine according to the present invention is used as an emulsifier, when the amount of oil reaches 40%, the oil cannot be stabilized due to its low viscosity, and the formulation is separated, resulting in an aqueous layer underneath. (Comparative Examples 6, 7, and 9; see FIG. 3), when the content of octadecylamine-grafted polyaspartic acid is less than the appropriate amount, it can be confirmed that the high content of oil is not stabilized in an emulsion state and separation of the formulation occurs. Yes (Comparative Example 8).

Claims (6)

A low-viscosity oil-in-water cosmetic composition containing octadecylamine-grafted polyaspartic acid as a polymer emulsifier and stabilizing oil,
The oil is an oil-in-water cosmetic composition, characterized in that contained in an amount of 30 to 36% by weight relative to the total weight of the composition. delete The oil-in-water cosmetic composition according to claim 1, wherein the composition has a viscosity of greater than 0 cps and less than 2000 cps. The oil-in-water cosmetic composition according to claim 1, wherein the octadecylamine-grafted polyaspartic acid is included in an amount of 1 to 3% by weight based on the total weight of the composition. The oil-in-water cosmetic composition according to claim 4, wherein the octadecylamine-grafted polyaspartic acid is included in an amount of 1.8 to 3% by weight based on the total weight of the composition. The oil-in-water cosmetic composition according to claim 1, wherein the oil is at least one selected from the group consisting of silicone oil, ester-based oil and hydrocarbon-based oil.