U.S. patent application number 14/186225 was filed with the patent office on 2015-08-27 for low viscous cosmetic composition using a natural emulsifying agent.
This patent application is currently assigned to AMOREPACIFIC CORPORATION. The applicant listed for this patent is AMOREPACIFIC CORPORATION. Invention is credited to Hui Kyoung CHANG, Sang Hoon HAN, Young So KIM, Lee Kyoung KWON, Myeong Ryeol LEE, Yong Joo NA, Byung Ryol PAIK.
Application Number | 20150238403 14/186225 |
Document ID | / |
Family ID | 53881163 |
Filed Date | 2015-08-27 |
United States Patent
Application |
20150238403 |
Kind Code |
A1 |
PAIK; Byung Ryol ; et
al. |
August 27, 2015 |
LOW VISCOUS COSMETIC COMPOSITION USING A NATURAL EMULSIFYING
AGENT
Abstract
The present invention relates to a low-viscosity cosmetic
composition using a natural emulsifying agent. More specifically,
the present invention relates to a cosmetic composition using a
naturally derived saccharide-based surfactant in place of a
chemical surfactant and realizing a low-viscosity formulation to
offer safety to the skin, feel good on the skin with fast
absorption, give stability to the formulation and add luster to the
skin in an effective manner.
Inventors: |
PAIK; Byung Ryol;
(Gyeonggi-do, KR) ; CHANG; Hui Kyoung;
(Gyeonggi-do, KR) ; LEE; Myeong Ryeol;
(Gyeonggi-do, KR) ; NA; Yong Joo; (Gyeonggi-do,
KR) ; KWON; Lee Kyoung; (Gyeonggi-do, KR) ;
KIM; Young So; (Gyeonggi-do, KR) ; HAN; Sang
Hoon; (Gyeonggi-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
AMOREPACIFIC CORPORATION |
Seoul |
|
KR |
|
|
Assignee: |
AMOREPACIFIC CORPORATION
Seoul
KR
|
Family ID: |
53881163 |
Appl. No.: |
14/186225 |
Filed: |
February 21, 2014 |
Current U.S.
Class: |
424/62 ;
424/93.51; 514/54 |
Current CPC
Class: |
A61K 8/062 20130101;
A61K 8/604 20130101; A61Q 19/02 20130101; A61K 8/60 20130101; A61Q
19/00 20130101; A61K 2800/596 20130101; A61K 8/73 20130101 |
International
Class: |
A61K 8/60 20060101
A61K008/60; A61Q 19/00 20060101 A61Q019/00; A61Q 19/02 20060101
A61Q019/02; A61K 8/06 20060101 A61K008/06; A61K 8/97 20060101
A61K008/97; A61K 8/42 20060101 A61K008/42 |
Claims
1. A cosmetic composition comprising a mixture of a first
saccharide-based surfactant having a first hydrophilic portion and
a second saccharide-based surfactant having a second hydrophilic
portion, the first hydrophilic portion of the first
saccharide-based surfactant being more hydrophilic than the second
hydrophilic portion of the second saccharide-based surfactant; and
a natural oil-soluble ingredient, wherein the composition contains
the mixture of the first saccharide-based surfactant and the second
saccharide-based surfactant in an amount of 0.20 wt. % to 1.50 wt.
% with respect to the total weght or the composition.
2. The cosmetic composition as claimed in claim 1, wherein the
composition is an oil-in-water type composition.
3. The cosmetic composition as claimed in claim 1, wherein the
composition has a viscosity of 1,000 to 4,000 cps.
4. The cosmetic composition as claimed in claim 1, wherein the
first saccharide-based surfactant includes at least one selected
from the group consisting of polyglyceryl-3-methyl glucose
distearate and inulin lauryl carbamate.
5. The cosmetic composition as claimed in claim 1, wherein the
second saccharide-based surfactant includes at least one selected
from the group consisting of sucrose fatty acid ester, cetearyl
glucoside, arachidyl glucoside, and C12-20 alkylglucoside.
6. The cosmetic composition as claimed in claim 1, wherein the
second saccharide-based surfactant and the first saccharide-based
surfactant are used at a weight ratio of 0.4 to 2.5
7. (canceled)
8. The cosmetic composition as claimed in claim 1, wherein the
natural oil-soluble ingredient comprises: a solid oil-soluble
ingredient including a surfactant having a melting temperature of
30.degree. C. or above and being in the solid state at the room
temperature, said solid oil-soluble ingredient comprising a fat, a
wax, a higher alcohol, a higher fatty acid, or a hydrocarbon; or a
liquid oil-soluble ingredient including an oil, an ester, or a
hydrocarbon.
9. The cosmetic composition as claimed in claim 1, wherein the
cosmetic composition contains the natural oil-soluble ingredient in
an amount of 5 wt. % to 15 wt. % with respect to the total weight
of the composition.
10. The cosmetic composition as claimed in claim 1, wherein the
composition further comprises at least one ingredient selected from
green tea polysaccharide, mushroom-derived yeast extract, and
niacinamide.
11. The cosmetic composition as claimed in claim 10, wherein the
composition contains the green tea polysaccharide and the
mushroom-derived yeast extract each at an amount of 0.01 wt. % to
5.0 wt. % with respect to the total weight of the composition.
12. The cosmetic composition as claimed in claim 10, wherein the
composition contains the niacinamide at an amount of 2 wt. % with
respect to the total weight of the composition.
13. The cosmetic composition as claimed in claim 1, wherein the
composition is for improving skin luster.
14. The cosmetic composition as claimed in claim 10, wherein the
composition is for whitening the skin.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a low-viscosity cosmetic
composition using a natural emulsifying agent and, more
particularly to an oil-in-water type cosmetic composition that
realizes a low-viscosity formulation using a naturally derived
saccharide-based surfactant in place of a synthetic surfactant to
offer safety to the skin, feel good on the skin with fast
absorption, give stability to the formulation and add luster to the
skin in an effective manner.
[0003] 2. Background Art
[0004] There are emulsion type cosmetics of various kinds, such as
creams, lotions, etc., available to protect the skin and keep it in
healthy condition. Such emulsion type cosmetics are required to
exert the sufficient effects of oil-soluble ingredients, feel good
on the skin and secure stability of preservation while being used
after opening.
[0005] With an increase in the attention to the skin safety in
recent years, many customers prefer cosmetics made of natural
ingredients. But, natural surfactants are likely to be inferior in
the emulsifying capacity to synthetic surfactants. On the other
hand, low-viscosity oil-in-water type formulations is quite a thin
consistency to feel good on the skin with fast absorption and
advantageously enhances the luster of the skin in contrast to the
solubilized low-viscosity formulations. However, low-viscosity
formulations have difficulty in achieving stability. Low-viscosity
formulations are more difficult to make with a naturally derived
surfactant which has a low emulsifying capacity. It is therefore
one problem in the field of cosmetics to prepare a stable
low-viscosity oil-in-water type cosmetic composition using a
naturally derived surfactant.
[0006] One method to prepare a stable low-viscosity oil-in-water
type cosmetic composition is preparing a nano-emulsion. Typically,
by preparing a nano-emulsion, the particle size is minimized to
allow the composition in Brownian motion not affected by the
gravity, thereby securing the stability of the formulation. The
representative method of preparing a nano-emulsion is the high
pressure emulsification method. But, the high pressure
emulsification method uses a strong physical force in preparing a
nano-emulsion and thus requires the use of a microfluidizer,
causing additional energy consumption. With a succession of
publications of studies on the toxic properties of nano-cosmetics,
the high pressure emulsification method is not suitable as a method
for preparing a cosmetic composition for improving skin stability
in the aspect of the safety to the human body.
[0007] The selection of surfactants to secure long-term stability
to the maximum is a problem to solve in order to prepare a stable
oil-in-water type cosmetic composition with a combination of
naturally derived surfactants having a low emulsifying capacity.
Such an appropriate combination of natural surfactants is very
difficult to find. Further, the proper content range of the
oil-soluble ingredient used in combination with the natural
surfactants is also of great importance.
PRIOR ART
Patent Document
[0008] Korean Patent Laid-Open No. 2010-0059279 (filed on Jun. 4,
2010)
DISCLOSURE OF INVENTION
Technical Problem
[0009] In an attempt to search for a combination of naturally
derived surfactants suitable for implementation of a low-viscosity
oil-in-water type cosmetic composition, the inventors of the
present invention have revealed the interactions between naturally
derived surfactants and natural oil-soluble ingredients and found
out that the interactions can be used to lower the viscosity of the
cosmetic composition, maintain the stability to the maximum and
improve the skin safety.
[0010] It is therefore an object of the present invention to
provide a cosmetic composition using a naturally derived surfactant
to provide a low-viscosity oil-in-water type formulation with skin
safety and fast absorption into the skin and thus enhance the
luster of the skin.
Technical Solution
[0011] To achieve the object of the present invention, there is
provided a cosmetic composition that includes a mixture of a
saccharide-based surfactant having a relatively large hydrophilic
portion and a saccharide-based surfactant having a relatively small
hydrophilic portion; and a natural oil-soluble ingredient.
Advantageous Effects
[0012] The cosmetic composition of the present invention uses a
naturally derived surfactant and a natural oil-soluble ingredient,
so it is non-irritating, of low-viscosity, stable in formulation,
with a light feeling, easily absorbed into the skin and more
effective in enhancing the luster of the skin. Also, the cosmetic
composition of the present invention uses a whitening component as
well to provide more effective whitening and lustering effects for
the skin.
BEST MODE FOR CARRYING OUT THE INVENTION
[0013] The present invention provides a low-viscosity cosmetic
composition containing a naturally derived surfactant and a natural
oil-soluble ingredient, and more particularly an oil-in-water type
cosmetic composition.
[0014] The cosmetic composition of the present invention is a
low-viscosity oil-in-water type emulsion using a naturally derived
saccharide-based surfactant instead of a synthetic surfactant and a
natural oil-soluble ingredient to offer a great skin safety and
secure improved formulation stability. Also, the cosmetic
composition can enhance the luster of the skin and provide a great
whitening effect.
[0015] The oil-in-water type cosmetic composition of the present
invention has a low viscosity of 1,000 to 4,000 cps. The viscosity
of the cosmetic composition less than 1,000 cps provides poor
stability, while the viscosity of the cosmetic composition greater
than 4,000 cps undesirably leads to difficulty of securing a thin
constancy of the cosmetic composition.
[0016] In order to use a naturally derived surfactant with enhanced
emulsifying capacity, the present invention employs a mixture of a
natural saccharide-based surfactant having a relatively large
hydrophilic portion and a natural saccharide-based surfactant
having a relatively small hydrophilic portion. A combination of the
saccharide-based surfactant having a relatively large hydrophilic
portion and the saccharide-based surfactant having a relatively
small hydrophilic portion at a predetermined ratio can make oil
particles packed with the interfacial membrane in an effective
manner to stabilize the oil-in-water formulation. In this regard,
the formulation stability can be achieved because the
saccharide-based surfactant having a relatively small hydrophilic
portion compactly fills in the gap between the interfacial
membranes consisting of the saccharide-based surfactant having a
relatively high hydrophilic portion.
[0017] In the present invention, among the naturally derived
saccharide-based surfactants, the surfactant having a relatively
small hydrophilic portion may include at least one selected from
the group consisting of sucrose fatty acid ester, cetearyl
glucoside, arachidyl glucoside, C12-20 alkylglucoside, etc., of
which the hydrophilic portion consists of a monosaccharide or a
disaccharide such as sucrose, glucoside of the like and thus has a
relatively small volume. Further, the surfactant having a
relatively large hydrophilic portion may include at least one
selected from the group consisting of polyglyceryl-3methylglucose
distearate, inulin lauryl carbamate, etc., of which the hydrophilic
portion consists of a polymer of monosaccharide or polysaccharide
such as inulin or the like and thus has a relatively large volume.
Most preferably, the surfactant may be a mixture of C12-20
alkylglucoside and inulin lauryl carbamate.
[0018] The cosmetic composition of the present invention contains
the mixture of naturally derived saccharide-based surfactants at an
amount of 0.20 wt. % to 1.50 wt. % with respect to the total weight
of the composition. The content of the mixture of naturally derived
saccharide-based surfactants less than 0.20 wt. % leads to low
emulsion stability to induce the phase separation, while the
content of the mixture of naturally derived saccharide-based
surfactants greater than 1.50 wt. % undesirably causes the
viscosity of the composition greater than 4,000 cps. Supposing that
the content of the natural saccharide-based surfactant having a
relatively large hydrophilic portion is 1, the weight ratio of the
natural saccharide-based surfactant having a relatively small
hydrophilic portion to the natural saccharide-based surfactant
having a relatively large hydrophilic portion is preferably in the
range of 0.4 to 2.5. If the mixing ratio is out of the
above-defined range, the emulsion stability can be so low to cause
the phase separation.
[0019] The naturally derived oil-soluble ingredient as used in the
present invention may include at least one selected from solid
ingredients, including a surfactant having a melting temperature of
30.degree. C. or above and being in the solid state at the room
temperature, fat, wax, higher alcohol, higher fatty acid, and
hydrocarbon; or liquid ingredients, including oil, ester,
hydrocarbon.
[0020] More specifically, the solid ingredients may include, for
example, surfactants, such as sucrose fatty acid ester, cetearyl
glucoside, inulin lauryl carbamate, C12-20 alkylglucoside, ammonium
lauryl sulfate, sodium lauryl glucose carboxylate, lauryl
glucoside, hydrogenated lecithin, lecithin, caprylyl/capryl
glucoside, etc.; fats, such as shea butter, mango seed butter,
cacao seed butter, etc.; waxes, such as myristyl myristate,
camellia sinensis leaf extract, jojoba, sunflower seed, carnauba
wax, candelilla wax, bee wax, etc.; higher alcohols, such as cetyl
alcohol, stearyl alcohol, behenyl alcohol, etc.; higher fatty
acids, such as caprylic/capric triglyceride, lauric acid, myristic
acid, palmitic acid, stearic acid, etc.; and hydrocarbons, such as
ceresin, etc. The liquid ingredients may include, for example,
oils, such as meadowfoam seed oil, sunflower seed oil, macadamia
seed oil, green tea seed oil, coconut oil, olive oil, camellia oil,
etc.; esters, such as phytosteryl/octyldodecyl lauroyl glutamate,
isostearyl isostearate, methylheptyl isostearate, dicaprylyl
carbonate, isopropyl palmitate, etc.; ethers, such as dicaprylyl
ether, etc.; and hydrocarbons, such as squalane, etc.
[0021] The cosmetic composition of the present invention contains
the oil-soluble ingredient in an amount of 5 wt. % to 15 wt. % with
respect to the total weight of the composition. The term "the
content of the oil-soluble ingredient" as used herein means the
total weight of the oil-soluble component excluding the surfactant
which is an emulsifying agent. The content of the oil-soluble
ingredient less than 5 wt. % leads to failure to provide the effect
as an emulsion type cosmetic, while the content of the oil-soluble
ingredient greater than 15 wt. % undesirably ends up having
difficulty of securing the formulation stability.
[0022] The present invention may further use an additional
whitening ingredient in order to enhance the effect of lustering
the skin and provide a whitening effect. In the present invention,
the whitening ingredient may further include at least one selected
from the group consisting of, particularly, green tea
polysaccharide, mushroom-derived yeast extract, and niacinamide.
These whitening ingredients are effective to reduce melanin
pigments and create a synergy in regards to the whitening efficacy,
improving the whitening effect.
[0023] Among the whitening ingredients used in the present
invention, the green tea polysaccharide which is isolated from
green tea powder through hot-water extraction, ultrafiltration, and
ethanol precipitation inhibits the production of melanin and the
expression of MMP-1 and increases the moisturizing ability of the
skin to provide a good whitening effect. Also, the mushroom-derived
yeast extract which is separated from truffles by enzyme hydrolysis
and heat treatment intensifies the activities of LC3 protein and
lysosome participating in the autophagy process in the epidermal
keratinocytes to eliminate waste matters from the skin, thus making
the skin light and clear. Finally, niacinamide which is a vitamin
B3 component inhibits the transfer of melanin from the cells that
produce melanin to the surface of the skin to help reduce
pigmentation and improve the skin tone. In particular, these
ingredients, such as green tea polysaccharide, mushroom-derived
yeast extract, and niacinamide, as used in the present invention
function on the respective steps of the skin whitening process to
provide a synergy, so they are all desirably used in
combination.
[0024] Among the skin whitening ingredients, the cosmetic
composition of the present invention may contain green tea
polysaccharide and mushroom-derived yeast extract in an amount of
0.01 wt. % to 5.0 wt. % with respect to the total weight of the
composition. The content of green tea polysaccharide and
mushroom-derived yeast extract less than 0.01 wt. % is too
insignificant to provide the skin whitening effect, while the
content of green tea polysaccharide and mushroom-derived yeast
extract greater than 5.0 wt. % undesirably causes skin irritation.
On the other hand, the content of niacinamide may be 2 wt. %, which
is usually accepted as the effective amount.
[0025] The cosmetic composition of the present invention may
further contain an appropriate amount of auxiliary ingredients
typically used in the preparation of oil-in-water type cosmetics,
such as colors, fragrances, preservatives, thickening agents, and
so forth. Preferably, the content of the auxiliary ingredients may
be 0 to 20 wt. % with respect to the total weight of the cosmetic
composition.
[0026] In consideration of the low-viscosity characteristic, if not
specifically limited in the formulation, the cosmetic composition
of the present invention may be formulated into a wide variety of
applications, including fundamental skin cosmetic compositions,
such as skin toner, nutrient toner, gel, lotion, etc.; hair-care
cosmetic compositions, such as hair tonic, hair essence, hair
restorer such as hair treatment, etc.; and other drugs and
quasi-drugs.
[0027] Hereinafter, the present invention will be described in
further detail with reference to the examples and experimental
examples, which are given only for better understanding of the
present invention. So it should be understood that modifications,
substitutions, or additions as known in the related art could be
made thereto without departing from the spirit and scope of the
invention.
[REFERENCE EXAMPLE] PREPARATION OF EXAMPLES AND COMPARATIVE
EXAMPLES
[0028] The oil-in-water type emulsions of Examples 1 to 5 and
Comparative Examples 1 to 6 are prepared in the manner as described
in the following preparation method according to the composition as
given in Tables 1 and 2.
TABLE-US-00001 TABLE 1 Example No Ingredient 1 2 3 4 5 1 C14-22
alcohol * C12-20 0.50 0.50 0.50 0.50 0.50 alkylglucoside 2
Vegetable squalane 3.00 3.00 3.00 3.00 3.00 3 Dicaprylyl carbonate
4.00 4.00 4.00 4.00 4.00 4 Dicaprylyl ether 2.00 2.00 2.00 2.00
2.00 5 Caprylic/capric 2.00 2.00 2.00 2.00 2.00 triglyceride 6
Cetearyl alcohol * 0.50 0.50 0.50 0.50 0.50 glyceryl stearate *
stearic acid * hydrogenated lecithin* polyglyceryl-3-methyl glucose
distearate 7 Butyrospermum parkii 0.50 0.50 0.50 0.50 0.50 (shea
butter) extract (shea butter (organic)) 8 Stearyl glycyrrhetinate
0.01 0.01 0.01 0.01 0.01 9 Purified water To To To To To 100 100
100 100 100 10 Disodium EDTA 0.02 0.02 0.02 0.02 0.02 11
Niacinamide, nicotiamide 0.00 2.00 2.00 2.00 2.00 (BP) 12 Inulin
lauryl carbamate 0.40 0.40 0.40 0.40 0.40 13 Xanthan gum 0.15 0.15
0.15 0.15 0.15 14 Dipropylene glycol 2.00 2.00 2.00 2.00 2.00 15
Tromethamine 0.05 0.05 0.05 0.05 0.05 16 Phenoxyethanol 0.30 0.30
0.30 0.30 0.30 17 Ethylhexyl glycerin 0.05 0.05 0.05 0.05 0.05 18
Butylene glycol 5.00 5.00 5.00 5.00 5.00 19 Hydroxyethyl 0.30 0.30
0.30 0.30 0.30 acrylate/sodium acryloyl dimethyl taurate copolymer
20 Purified water 8.00 8.00 8.00 8.00 8.00 21 Carbomer 0.08 0.08
0.08 0.08 0.08 22 Broussonetia kazinoki 1.00 1.00 1.00 1.00 1.00
root extract * propanediol * ginko biloba leaf extract * butylene
glycol * glycyrrhiza glabra (licorice) root extract 23 Purified
water * butylene 0.00 0.00 1.00 0.00 0.50 glycol * camellia
sinensis leaf extract * caprylyl glycol * 1,2-hexanediol 24
Butylene glycol * silybum 0.10 0.10 0.10 0.10 0.10 marianum fruit
extract 25 Mushroom-derived yeast 0.00 0.00 0.00 1.00 0.50 extract
26 Butylene glycol 3.00 3.00 3.00 3.00 3.00 27 Resveratrol (10%)
0.01 0.01 0.01 0.01 0.01 (methylmethacrylate/ acrylonitrile
copolymer/resveratrol) 28 Compound fragrance 0.15 0.15 0.15 0.15
0.15
TABLE-US-00002 TABLE 2 Comparative Example No Ingredient 1 2 3 4 5
6 1 C14-22 alcohol * C12-20 0.10 0.50 0.15 1.15 0.50 0.50 alkyl
glycoside 2 Vegetable squalane 3.00 3.00 3.00 3.00 1.00 4.00 3
Dicapryryl carbonate 4.00 4.00 4.00 4.00 1.00 5.00 4 Dicaprylyl
ether 2.00 2.00 2.00 2.00 1.00 3.00 5 Caprylic/capric 2.00 2.00
2.00 2.00 0.50 3.00 triglyceride 6 Cetearyl alcohol * 0.50 0.50
0.50 0.50 0.50 1.00 glyceryl stearate * stearic acid * hydrogenated
lecithin* polyglyceryl-3-methyl glucose distearate 7 Butyrospermum
parkii 0.50 0.50 0.50 0.50 0.50 1.00 (shea butter) extract (shea
butter (organic)) 8 Stearyl glycyrrhetinate 0.01 0.01 0.01 0.01
0.01 0.01 9 Purified water To To To To To To 100 100 100 100 100
100 10 Disodium EDTA 0.02 0.02 0.02 0.02 0.02 0.02 11 Niacinamide,
0.00 0.00 0.00 0.00 0.00 0.00 nicotiamide (BP) 12 Inulin lauryl
carbamate 0.08 0.00 0.40 0.40 0.40 0.40 13 Xanthan gum 0.15 0.15
0.15 0.15 0.15 0.15 14 Dipropylene glycol 2.00 2.00 2.00 2.00 2.00
2.00 15 Tromethamine 0.05 0.05 0.05 0.05 0.05 0.05 16
Phenoxyethanol 0.30 0.30 0.30 0.30 0.30 0.30 17 Ethylhexyl glycerin
0.05 0.05 0.05 0.05 0.05 0.05 18 Butylene glycol 5.00 5.00 5.00
5.00 5.00 5.00 19 Hydroxyethyl 0.30 0.30 0.30 0.30 0.30 0.30
acrylate/sodium acryloyl dimethyl taurate copolymer 20 Purified
water 8.00 8.00 8.00 8.00 8.00 8.00 21 Carbomer 0.08 0.08 0.08 0.08
0.08 0.08 22 Broussonetia kazinoki 1.00 1.00 1.00 1.00 1.00 1.00
root extract * propanediol * ginko biloba leaf extract * butylene
glycol * glycyrrhiza glabra (licorice) root extract 23 Purified
water * 0.00 0.00 0.00 0.00 0.00 0.00 butylene glycol * camellia
sinensis leaf extract * caprylyl glycol * 1,2-hexanediol 24
Butylene glycol * 0.10 0.10 0.10 0.10 0.10 0.10 silybum marianum
fruit extract 25 Mushroom-derived yeast 0.00 0.00 0.00 0.00 0.00
0.00 extract 26 Butylene glycol 3.00 3.00 3.00 3.00 3.00 3.00 27
Resveratrol (10%) 0.01 0.01 0.01 0.01 0.01 0.01
(methylmethacrylate/ acrylonitrile copolymer/resveratrol) 28
Compound fragrance 0.15 0.15 0.15 0.15 0.15 0.15
[0029] <Preparation Method>
[0030] (1) The ingredients 9 to 17 of Table 1 are mixed together
and dissolved at 70.degree. C. to prepare a water phase.
[0031] (2) In a separate container, the ingredients 1 to 8 of Table
1 are dissolved at 70.degree. C. to prepare an oil phase.
[0032] (3) The oil phase of the step (2) is added to the water
phase of the step (1), and the mixture is blended with a homo-mixer
under agitation.
[0033] (4) The ingredients 18 and 19 and the ingredients 20 and 21
are added to the mixture of the step (3), and the resultant mixture
is stirred with a homo-mixture and then cooled down to 50.degree.
C.
[0034] (5) The ingredients 22 to 28 are added to the mixture of the
step (4), and the resultant mixture is stirred with a homo-mixer
and, after degasification, cooled down to 30.degree. C. to prepare
a cosmetic composition.
[0035] [Experimental Example 1] Change of viscosity and stability
on the function of the combination and content of naturally derived
saccharide-based surfactants and the content of oil-soluble
ingredient
[0036] Each oil-in-water type emulsion of Example 1 and Comparative
Examples 1 to 6 was evaluated in regards to the change of viscosity
and stability on the function of the change in the combination and
content of surfactants (Comparative Examples 1 to 4) and the change
in the content of the oil-soluble ingredient (Comparative Examples
5 and 6). In this regard, the viscosity was measured with Spindle
No. 3 at 12 rpm using a Brookfield viscometer LVDV-II (manufactured
by Brookfield engineering laboratories). The measurement results
are presented in Table 3.
TABLE-US-00003 TABLE 3 Test Viscosity substance (cps) Stability
In-use feel Example 1 1,630 Good Quite a thin constancy Comparative
240 Separation at 60.degree. C. Feels light Example 1 next day
Comparative 870 Separation at 60.degree. C. Feels light Example 2
in 7 days Comparative 865 Separation at 60.degree. C. Feels light
Example 3 next day Comparative 2,350 Good Feels heavy and Example 4
leaves residue Comparative 1,100 Good Lacks in Example 5 softness
Comparative 2,120 Separation at 30.degree. C. Too oily Example 6
immediately after preparation Good: Typically, considered to secure
4-week stability in a cycle pyrostat at -10.degree. C., 5.degree.
C., 30.degree. C., 37.degree. C., 45.degree. C. or 60.degree.
C.
[0037] As can be seen from the results of Table 3, the oil-in-water
type emulsion of Example 1 having the combination and content of
naturally derived saccharide-based surfactants and the content of
the oil-soluble ingredient according to the present invention can
secure formulation stability and light feel with a thin constancy
at the target viscosity of 4,000 cps or below. Contrarily, the
oil-in-water type emulsion which contains the naturally derived
saccharide-based surfactants at an amount of less than 0.20 wt. %
(Comparative Example 1) has an extremely low viscosity and
undergoes phase separation at high temperature the next day without
securing formulation stability. The oil-in-water type emulsion
which contains the naturally derived saccharide-based surfactants
at an amount of greater than 1.50 wt. % (Comparative Example 4)
secures formulation stability but has an extremely high viscosity
to offer a thin consistency, leaving residues on the skin. Further,
the oil-in-water type emulsion undergoes phase separation at high
temperature and fails to secure formulation stability when it does
not contain either one of the saccharide-based surfactant having a
relatively large hydrophilic portion or the saccharide-based
surfactant having a relatively small hydrophilic portion or has an
inappropriate combination of the saccharide-based surfactant having
a relatively large hydrophilic portion and the saccharide-based
surfactant having a relatively small hydrophilic portion
(Comparative Examples 2 and 3). Finally, the oil-in-water type
emulsion which contains the oil-soluble ingredient at an amount of
less than 5 wt. % (Comparative Example 5) lacks in softness, and
the oil-in-water type emulsion which contains the oil-soluble
ingredient at an amount of greater than 15 wt. % (Comparative
Example 6) fails to emulsify and undergoes phase separation at the
room temperature.
[0038] [Experimental Example 2] Measurement of skin melanin index
according to the content of whitening ingredient
[0039] To evaluate the whitening effect of the cosmetic
compositions of Examples 1 to 5, thirty-one healthy women who are
25 to 35 years old with at least third-degree hyperpigmentation on
the face according to SOP are told to use each emulsion for 8 weeks
to measure the skin lightness and the melanin index after the
applications. More specifically, thirty-one women are divided into
two groups: the one consists of 15 women, the other 16 women. Each
group uses two compositions. The melanin index is measured with a
Mexameter three times on the hyperpigmented region and the
non-pigmented region before the application of each emulsion and
after 8 weeks of application. The melanin index is used to
calculate the improvement rate of melanin index according to the
following equation 1 and then averaged. The results are presented
in Table 4.
Improvement rate ( % ) of melanin index = Melanin index after 8
weeks - Melanin index before use Melanin index before use .times.
100 [ Equation 1 ] ##EQU00001##
TABLE-US-00004 TABLE 4 Measurement results Measured Example Index
region 1 2 3 4 5 Improvement Hyperpigmented -0.07 -3.21 -4.68 -4.13
-7.34 rate (%) of region melanin Non-pigmented -0.03 -3.01 -3.45
-3.14 -5.84 index region
[0040] As can be seen from Table 4, the cosmetic composition
containing none of green tea polysaccharide, mushroom-derived yeast
extract and niacinamide (Example 1) shows the melanin index
improving effect after 8 weeks. The cosmetic composition containing
niacinamide (Example 2) has the melanin index improving effect. The
cosmetic composition containing either a combination of niacinamide
and green tea polysaccharide or a combination of niacinamide and
mushroom-derived yeast extract (Example 3 or 4) exerts the greater
effect to improve the melanin index. Also, the cosmetic composition
containing all the three ingredients of niacinamide, green tea
polysaccharide and mushroom-derived yeast extract (Example 5)
provides the synergy effect to remarkably reduce the melanin
index.
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