 |
Description  |
|
|
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a water-in-oil type (hereinafter
abbreviated as W/O type) emulsified composition useful as a cosmetic or
ointment base. More specifically, it relates to a water-in-oil type
emulsified composition having specific features whereby a range of oils
from polar oils to non-polar oils can be widely employed as the oil
component which becomes the outer phase and the emulsified composition
obtained has an excellent temperature stability and usability.
The present invention also relates to a water-and polyhydric alcohol-in-oil
type emulsified composition useful as a cosmetic or ointment base. More
specifically, it relates to a water- and polyhydric alcohol-in-oil type
emulsified composition having specific features whereby a silicone oil can
be used as the oil component which becomes the outer phase, and the
emulsified composition obtained has an excellent temperature stability. In
the second aspect of the present invention, the composition is not
referred to as a water-in-oil type emulsified composition or polyhydric
alcohol-in-oil type emulsified composition, because the inner phase of
this emulsion composition comprising the main component exists in the
region bridging the region of water and the region of polyhydric alcohol,
and therefore, neither expression is adequate. Accordingly, the term
water- and polyhydric alcohol-in-oil type emulsified composition denotes
an emulsified composition containing both water and a polyhydric alcohol
in the oil phase.
2. Description of the Related Art
In the prior art, to obtain a W/O type emulsified composition, a lipophilic
surfactant having a HLB value of 1 to 12, for example, a polyhydric
alcohol fatty acid ester type surfactant such as glycerine fatty acid
ester, sorbitan fatty acid ester, etc., is used as the emulsifier, this
surfactant is added in an amount of about 0.4 to 5.0 g into the oil phase,
to be dissolved therein by heating to about 70.degree. to 80.degree. C.,
and the aqueous phase heated to about the same temperature is then added,
followed by stirring by a homomixer, etc., to obtain a W/O type emulsified
composition (hereinafter called W/O type emulsion).
Nevertheless, the W/O type emulsion thus obtained has a drawback in that a
system having an excellent temperature stability and usability can be
obtained only with difficulty, compared with the oil-in-water type
(hereinafter called O/W type) emulsion. For example, with regard to the
temperature stability, a separation of the oil phase, which is the
continuous phase, may occur due to an agglomeration of water droplets at a
low temperature. This oil phase separation also occurs at a high
temperature, in that water droplets are combined, and thus have an
increased particle size, and precipitated to form a sediment lower layer,
and thus the upper layer consists of only the oil phase. With regard to
usability, since the outer phase consists of an oil component, the
advantages of skin protection, flexibility, etc., can be obtained in the
fields of cosmetics and pharmaceuticals, although the drawbacks of
stickiness during usage and a high skin barrier also exist.
In a known method for improving the temperature stability, a large amount
of a wax is formulated in the oil phase, but although low temperature
stability may be improved by this method, during storage at high
temperature, a softening or melting, occurs of the formulated wax, and
therefore, oil phase separation caused by water droplet combination cannot
be alleviated, and thus another drawback of a problem of usability, such
as spreading, arises.
As a method for eliminating the such usability problems, preferably a polar
oil component having ester bond, as widely employed in the O/W type
emulsion system, is formulated, but when the W/O type emulsifier used in
the prior art is formulated, it is difficult to form a W/O type emulsion
having an excellent stability in a system wherein a polar oil component is
also formulated.
SUMMARY OF THE INVENTION
Accordingly, the objects of the present invention are to eliminate the
above-mentioned disadvantages of the prior art and to provide a
water-in-oil type emulsified composition capable of being widely employed
as an oil component and having an excellent temperature stability and
usability.
Another object of the present invention is to provide a water- and
polyhydric alcohol-in-oil type emulsified composition capable of being
employed as an oil component and having an excellent temperature
stability.
Other objects and advantages of the present invention will be apparent from
the following description.
In accordance with the present invention, there is provided a water-in-oil
type emulsified composition comprising, a water-swellable clay mineral, a
nonionic surfactant, an oil component, and water, as the essential
constituents.
In accordance with the present invention, there is also provided a
water-in-oil type emulsified composition comprising, a water-swellable
clay mineral, a quaternary ammonium salt type cationic surfactant, one or
two or more kinds of polyoxyalkylene modified organopolysiloxane, an
aqueous phase, and an oil phase containing one or two or more kinds of an
organic silicone resin comprising the units of the formula:
RnSiO.sub.(4-n)/2
wherein R is a hydrocarbon group having 1 to 6 carbon atoms or a phenyl
group, and n represents a value of 1.0 to 1.8.
In accordance with the present invention, there is further provided a
water- and polyhydric alcohol-in-oil type emulsified composition
comprising an oil component containing a silicone oil using a
polyoxyalkylene modified organopolysiloxane, a water-swellable clay
mineral, a quaternary ammonium salt type cationic surfactant water, and a
polyhydric alcohol.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood from the description set
forth below with reference to the accompanying drawing of FIG. 1, which
shows the relationship between the amounts formulated and viscosity of
Smectite. In FIG. 1, the axis of the ordinate represents the viscosity
(cps), and the axis of the abscissa shows the % by weight of Smectite.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The water-swellable clay minerals to be used in the present invention are
laminar silicate minerals belonging to genus Smectite generally including
montmorillonite, beidelite, nontronite, saponite, hectorite, etc. These
may be natural or synthetic. Examples of the commercially available
products are Kunipia, Smecton (both from Kunipia Kogyo), Veegum (from
Vanderbilt Co.), Laponite (from Laporte Co.), fluorine tetra silicic mica
(from Topy Kogyo K.K.). In the practice of the present invention, one or
more kinds of minerals are used from these water-swellable clay minerals.
The formulated amount is suitably 0.2 to 5.0% by weight, more preferably
0.2 to 3.0% by weight, based on the total weight of the emulsified
composition of the present invention. If the proportion is less than 0.2%
by weight, the temperature stability may not be satisfactory, depending on
the product, and if formulated in excess of 5.0% by weight, the viscosity
of the system may be increased, which may have an adverse affect on the
usability of some product.
As the nonionic surfactant to be used in the first aspect of the present
invention, nonionic surfactants having an HLB value of 2 to 16, more
preferably 3 to 12 may be included. The HLB value of the nonionic
surfactant is calculated by the Kawakami formula shown below:
##EQU1##
(wherein Mw represents the molecular weight of the hydrophilic group
portion, and Mo represents the molecular weight of the lipophilic group
portion.)
Specific examples may include ethylene oxide addition type surfactants,
including ether type surfactants such as polyoxyethylene 2-30 mole
addition [hereinafter abbreviated as POE (2-30)]oleyl ether, POE (2-35)
stearyl ether, POE (2-20) lauryl ether, POE (1-20) alkylphenyl ether, POE
(6-18) behenyl ether, POE (5-25) 2-decylpentadecyl ether, POE (3-30)
2-decyltetradecyl ether, POE (8-16) 2-octyldecyl ether, etc.; ester type
surfactants such as POE (4-60) hardened castor oil, POE (3-14) fatty acid
monoester, POE (6-30) fatty acid diester, POE (5-20) sorbitan fatty acid
ester, etc.; ether ester type surfactants such as POE (2-30) glyceryl
monoisostearate, POE (10-60) glyceryl triisostearate, POE (7-50) hardened
castor oil monoisostearate, POE (12-60) hardened castor oil
triisostearate, etc.; and polyhydric alcohol fatty acid ester type
surfactants including polyglycerine fatty acid esters such as decaglyceryl
tetraoleate, hexaglyceryl triisostearate, tetraglyceryl diisostearate,
diglyceryl diisostearate, etc.; glycerine fatty acid esters such as
glyceryl monostearate, glyceryl monoisostearate, glyceryl monooleate, etc.
Among these surfactants, nonionic surfactants such as polyglycerine fatty
acid esters of triglycerine or higher such as decaglyceryl tetraoleate,
hexaglyceryl triisostearate, tetraglyceryl diisostearate, POE addition
ether type surfactants such as POE (2-12) oleyl ether, POE (3-12) stearyl
ether, POE (2-10) lauryl ether, POE (2-10) nonylphenyl ether, POE (6-15)
behenyl ether, POE (5-20) 2-decylpentadecyl ether, POE (5-17)
2-decyltetradecyl ether, and POE (8-16) 2-octyldecyl ether, etc.; POE
addition ester type surfactants such as POE (10-20) hardened castor oil,
POE (5-14) oleic acid monoester, POE (6-20) oleic acid diester, POE (5-10)
sorbitan oleic acid ester, etc.; POE addition ether ester type surfactants
such as POE (3-15) glyceryl monoisostearate, POE (10-40) glyceryl
triisostearate, etc., are particularly preferred.
As another type of the nonionic surfactants to be used in the present
invention, there may be included polyether modified silicone compounds
represented by the following formulae. Note, these surfactants are
particularly suitable when the oil is a silicone oil or an oil containing
a silicone oil.
##STR1##
In the practice of the first aspect of the present invention, one or two or
more kinds may be selected and used as desired from among these nonionic
surfactants. The amount formulated is preferably 0.05 to 2-fold relative
to the water-swellable clay mineral.
As the oil component to be used in the first aspect of the present
invention, all of the oil components generally employed in cosmetics,
pharmaceuticals, etc., can be used, and the range of from polar oils to
non-polar oils can be widely used as the oil. Examples of the oil
component include hydrocarbon oils such as liquid paraffin, squalane,
isoparaffin, branched chain light paraffin, etc.; ester oils such as
isopropyl myristate, cetyl isooctanoate, glyceryl trioctanoate, etc.;
silicone oils such as octamethyltetrasiloxane,
decamethylcyclopentasiloxane, dimethylpolysiloxane,
methylphenylpolysiloxane, etc. Also waxes such as petrolatum,
microcrystalline, lanolin, beeswax, etc., can be formulated within the
range which does not impair the effect of the present invention. These oil
components are formulated in amounts of about 5 to 90% by weight,
preferably 10 to 80% by weight, in the W/O type emulsion.
The quaternary salt type cationic surfactant to be used in the second
aspect of the present invention is represented by the following formula:
##STR2##
wherein R.sub.1 is an alkyl group having 10 to 22 carbon atoms or a benzyl
group, R.sub.2 is a methyl group or an alkyl group having 10 to 22 carbon
atoms, R.sub.3 and R.sub.4 are each an alkyl group or hydroxyalkyl group
having 1 to 3 carbon atoms, and X represents a halogen atom or a methyl
sulfate residue. For example, there may be included
dodecyltrimethylammonium chloride, myristyltrimethylammonium chloride,
cetyltrimethylammonium chloride, stearyltrimethylammonium chloride,
arachyltrimethylammonium chloride, behenyltrimethylammonium chloride,
myristyldimethylethylammonium chloride, cetyldimethylethylammonium
chloride, stearyldimethylethylammonium chloride,
arachyldimethylethylammonium chloride, behenyldimethylethylammonium
chloride, myristyldiethylmethylammonium chloride,
cetyldiethylmethylammonium chloride, stearyldiethylmethylammonium
chloride, arachyldiethylmethylammonium chloride,
behenyldiethylmethylammonium chloride, benzyldimethylmyristylammonium
chloride, benzyldimethylcetylammonium chloride,
benzyldimethylstearylammonium chloride, benzyldimethylbehenylammonium
chloride, benzylmethylethylcetylammonium chloride,
benzylmethylethylstearylammonium chloride, distearyldimethylammonium
chloride, dibehenyldihydroxyethylammonium chloride, and corresponding
bromides, etc., and further, dipalmitylpropylethylammonium methylsulfate,
etc.
In the practice of the present invention, one or more kinds of these
surfactants may be selected as desired.
The content of the quaternary ammonium salt type cationic surfactant in the
W/O type emulsion of the present invention is preferably 40 to 140
milliequivalents (hereinafter abbreviated as meq) more preferably 60 to
120 meq, per 100 g of the water-swellable clay mineral. The quaternary
ammonium salt type cationic surfactant and the water-swellable clay
mineral may be added separately to the oil phase and the aqueous phase,
respectively, during the preparation of the emulsion, or alternatively
both, including a commercial product (e.g., Benton, produced by the
National Lead Co.) may be previously allowed to react in a suitable
solvent, and the reaction product may be added to the oil phase.
The polyoxyalkylene modified organopolysiloxane to be used in the second
aspect of the present invention is preferably a polyoxyalkylene modified
organopolysiloxane represented by the formulae (A), (B), (C), and (D)
shown above, and any one or two or more kinds thereof may be formulated;
the formulated amount being preferably 75 to 2000 g, more preferably 100
to 1500 g, based on 100 g of the water-swellable clay mineral.
The organic silicone resin to be used in the second aspect of the present
invention comprises a suitable combination of the R.sub.3 SiO.sub.1/2 k
units, R.sub.2 SiO units, RSiO.sub.3/2 units and SiO.sub.2 units, and the
proportion thereof is selected so as to satisfy the average formula:
RnSiO.sub.(4-n)/2 (R represents a hydrocarbon having 1 to 6 carbon atoms
or a phenyl group, and n represents a value of 1.0 to 1.8), and desirably
has an average molecular weight of about 1500 to 10000.
The amount of the organic silicone resin formulated in the present
invention is 0.5 to 50% by weight in the emulsion composition, preferably
1 to 30% by weight. If less than 0.5% by weight, sufficient hardening
cannot be obtained, and if over 50% by weight, the compatibility thereof
with other oil components may be lowered, and the stickiness increased.
The polyoxyalkylene modified organopolysiloxane to be used in the third
aspect of the present invention are those described above.
The water-swellable clay minerals to be used in the third aspect of the
present invention are those as described above.
The quaternary salt type cationic surfactants to be used in the third
aspect of the present invention are those as mentioned above.
The amounts of polyoxyalkylene modified organopolysiloxane, the
water-swellable clay mineral, and the quaternary ammonium salt type
cationic surfactant to be used in the third aspect of the present
invention are controlled in accordance with the inner phase ratio and the
viscosity of the emulsified composition to be obtained. Since the
polyoxyalkylene modified organopolysiloxane participates in the
emulsifiability, if the amount is too small, the emulsifiability is
lowered, and the water-swellable clay mineral and the quaternary ammonium
salt type cationic surfactant tend to raise the viscosity as the amounts
formulated thereof are increased. Accordingly, the amounts of
polyoxyalkylene modified organopolysiloxane, the water-swellable clay
mineral and the quaternary ammonium salt type cationic surfactant
formulated are preferably 0.5 to 20% by weight, 0.1 to 5% by weight, and
0.1 to 2% by weight, respectively.
As the silicone oil to be used as the oil phase in the third aspect of the
present invention, any of those conventionally used for cosmetics or
pharmaceuticals may be used, as exemplified by dimethylpolysiloxane,
dimethylcyclopolysiloxane, methylphenylpolysiloxane,
methylhydrogenpolysiloxane, higher fatty acid modified organopolysiloxane,
higher alcohol modified organopolysiloxane, trimethylsiloxy silicate, etc.
In particular, to remove the sticky feeling during usage, volatile
dimethylpolysiloxane and dimethylcyclopolysiloxane having the structures
(E) and (F) shown below can be exemplified, and one or more kinds thereof
may be selected and used as desired.
The amount of the silicone oil formulated is related to the amount of the
other oil phase components. If the amount of silicone oil is small, the
properties of the oil phase become almost the same as the properties of
the other formulated oil components, and thus a lipophilic surfactant
suitable for the oil phase is preferably used. On the other hand, if the
amount of silicone oil is high, the polyoxyalkylene modified
organopolysiloxane of the present invention suitable for a silicone oil is
preferably used. Accordingly, it is particularly preferred that the
silicone oil comprise 50% or more of the oil phase component.
##STR3##
The polyhydric alcohol to be used in the third aspect of the present
invention has 2 or more hydroxyl groups in the molecule, and includes, for
example, liquid polyhydric alcohols such as polyethylene glycol,
dipropylene glycol, 1,3-butylene glycol, propylene glycol, glycerine,
etc., and solid polyhydric alcohols such as sorbitol, maltitol, etc. The
mixing ratio of water and the polyhydric alcohol in the inner phase is
preferably, water:polyhydric alcohol=9:1 to 1:9, more preferably, in the
region of about 2:3 to 3:2. When the oil component is silicone oil alone,
a region giving a certain transparency appears, whereby a specific
appearance feature can be imparted.
The total amount of water and the polyhydric alcohol formulated may be
about 5 to 80% by weight in the water- and polyhydric alcohol-in-oil type
emulsified composition, preferably 10 to 70% by weight.
In the W/O type emulsion according to the first aspect of the present
invention, it is also possible to formulate amino acids and salts thereof,
humectants, thickeners, preservatives, antioxidants, sequestering agents,
UV-ray absorbers, drugs, natural extracts such as animal and vegetable
extracts, pigments, dispersing agents, flavors, etc., if desired, within
the range which does not impair the effect of the present invention.
Examples of the above amino acids may include alanine, alginine, alginine
hydrochloride, asparagine monohydrate, aspartic acid, citrulline,
cysteine, cystine, glutamic acid, glutamic acid hydrochloride, glutamine,
glycine, histidine, histidine hydrochloride, hydroxyproline, isoleucine,
leucine, lysine, lysine hydrochloride, methionine, ornithine
hydrochloride, proline, phenylalanine, serine, threonine, tryprophan,
tyrosine, valine, dopa, o-aminobutyric acid, etc., which comprise a
L-derivative, D-derivative, and DL-derivative. Particularly preferred
among the above are glycine, L-hydroxyproline, L-alanine, L-proline, and
L-serine, and the metals for forming salts therewith may include sodium,
potassium, lithium, calcium, and magnesium, etc.
For preparing the water-in-oil type emulsified composition according to the
first aspect of the present invention, for example, there may be included
the method in which the water-swellable clay mineral, the oil component
and the nonionic surfactant are mixed with stirring by heating to about
70.degree. C., the aqueous phase is added thereto, and the mixture is
stirred, or the method in which the oil component and the nonionic
surfactant are mixed by heating at about 70.degree. C., and the aqueous
phase having the water-swellable clay mineral dispersed in and swelled
with water is added, followed by stirring, etc.
In the W/O type emulsion according to the second aspect of the present
invention, all oil components generally employed in cosmetics,
pharmaceuticals, etc., other than the above oil components can be used,
and a broad range of from polar oils to non-polar oils can be used.
Examples of oil components may include hydrocarbon type oil components
such as liquid paraffin, squalane, petrolatum, microcrystalline wax, etc.;
ester oils such as isopropyl myristate, cetyl isooctanoate, glyceryl
trioctanoate, etc.; silicone oils such as octamethyltetrasiloxane,
decamethylpentasiloxane, dimethylpolysiloxane, methylphenylpolysiloxane,
etc.; high molecular weight silicones exhibiting soft rubbery state such
as dimethylpolysiloxane, methylphenylpolysiloxane, terminal hydroxyl
containing dimethylpolysiloxane, terminal hydroxyl containing
methylphenylpolysiloxane (i.e., dimethylpolysiloxane containing a terminal
hydroxyl group), etc.; lanolin, beeswax, olive oil, coconut oil, safflower
oil, castor oil, cottonseed oil, jojoba oil, carunauba wax, macademia nut
oil, fatty acids, higher alcohols, etc.; and drugs such as
antiphlogistics, vitamins, hormones, etc.; these oil components can be
formulated within the range which does not impair the effect of the
present invention. Namely, these oil components can be formulated in the
amount of 5 to 90% by weight in the W/O type emulsion, preferably 10 to
80% by weight.
In the W/O type emulsion according to the second aspect of the present
invention, if desired, oil-soluble and water-soluble substances or
dispersible substances can be formulated within the range which does not
impair the effect of the present invention. For example, amino acids and
salts thereof in NMF (Natural Moisturizing Factor) existing in the stratum
corneum, lower alcohols, mucopolysaccharides, humectants, thickeners,
preservatives, antioxidants, sequestering agents, UV-ray absorbers, drugs,
galenicals, pigments, dispersing agents, flavors, etc. can be formulated.
Also, in the emulsified composition according to the second aspect of the
present invention, components conventionally used can be formulated within
the range which does not impair the effect of the present invention. For
example, there can be formulated in the emulsified composition; as the
aqueous phase component, mucopolysaccharides such as sodium hyaluronate;
organic acids and organic acid salts such as amino acids, amino acid
salts, hydroxyacid salts, etc.; as the oil phase component, solid or
semi-solid oil components such as petrolatum, lanolin, ceresine, silicone
wax, microcrystalline wax, carunauba wax, candelilla wax, higher fatty
acids, higher alcohols, etc.; fluid oil components such as squalane,
liquid paraffin, ester oils, triglycerides, etc.; surfactants such as
cationic surfactants, anionic surfactants, nonionic surfactants, etc.;
drugs such as vitamin E, vitamin E acetate, etc.; styptics; antioxidants;
preservatives; flavors; pH controllers such as sodium biphosphate, etc.;
thickeners; UV-ray absorbers; inorganic powders such as talc, kaolin,
mica, silica, magnesium silicate, calcium silicate, aluminium silicate,
hydrous iron oxide, hydroxyapatite, etc.; organic powders such as nylon
powder, polyethylene powder, benzoguanamine powder, tetrafluoroethylene
powder, boron nitride, etc.; inorganic pigments such as titanium oxide,
zinc oxide, iron oxide, iron titanate, yellow earth, Mango Violet, Cobalt
Violet, chromium hydroxide, chromium oxide, cobalt titanate, Prussian
Blue, Ultramarine, etc.; pearl pigments such as titanium oxide coated
mica, titanium oxide coated talc, fish scales, etc.; tar type dyes formed
into lake and natural dyes formed into lake and these inorganic powders,
organic powders, inorganic pigments, organic pigments subjected to the
hydrophobic treatment with silicone, and organic compounds, etc.
The W/O type emulsion according to the first aspect of the present
invention is prepared by utilizing the complex W/O emulsifying action of a
conventional emulsifier and a water-swellable clay mineral, and the total
amount of both functioning as the W/O emulsifier may be as small as 0.25
to 5% by weight, whereby the viscosity can be controlled by controlling
the formulated amount or the ratio of the inner aqueous phase without the
formulation of a solidifying agent such as wax, and an oil component with
a high polarity, which could be formulated only with difficulty in the
prior art, can be used, and accordingly, an excellent storage stability
over a wide temperature range is obtained. The W/O type emulsion of the
present invention having these great advantages can be widely utilized in
the wide fields of cosmetics and pharmaceuticals, etc.
In the W/O type emulsion according to the second aspect of the present
invention, by utilizing an organic modified clay mineral formed from a
water-swellable clay mineral, quaternary ammonium salt type cationic
surfactant and a polyoxyalkylene modified organopolysiloxane as the
emulsifier and gelling agent in the recipe, a good emulsifiability is
exhibited even when the amount formulated is as small as 0.25 to 7% by
weight, and by controlling the amount or the ratio of the inner aqueous
phase or the outer oil phase, the viscosity can be controlled without
formulating a large amount of a solidifying agent such as wax, etc. Also,
an oil component with high polarity, which could be formulated only with
difficulty in the prior art, also can be used, and thus the emulsion has
an excellent stability over a wide temperature range. The use of the
organic silicone resin as the oil phase component in the W/O type emulsion
of the present invention, ensures that the emulsion has a good water
resistance and water repellency, and therefore, is able to store a
substance to be maintained on the skin for a long period such as a drug,
UV-ray absorber, humectant, etc. The W/O type emulsion of the present
invention having these great advantages can be widely utilized in fields
such as cosmetics or pharmaceuticals, by making use of the specific
features thereof.
According to the third aspect of the present invention, by controlling the
amounts of the polyoxyalkylene modified organopolysiloxane, the
waterswellable clay mineral and the quaternary ammonium salt type cationic
surfactant or the ratio of the inner phase (aqueous phase), the viscosity
can be controlled without the formulation of a solidifying agent such as
wax, etc., and by using a silicone oil, which could be formulated only
with difficulty in the prior art, the inner phase can be a region bridging
the region with water as the main component and the region with a
polyhydric alcohol as the main component, and the composition also has an
excellent storage stability over a wide temperature range. Further, the
emulsified composition of the present invention suffers little change in
viscosity due to temperature changes and has a high water repellency when
coated on the skin; different from the case when thickened with a wax,
etc. The water- and polyhydric alcohol-in-oil type emulsified composition
having these great advantages can be widely utilized in the fields of
pharmaceuticals, cosmetics, paints, etc., by making use of the specific
features thereof. For the water-swellable clay mineral and the quaternary
ammonium salt type cationic surfactant in the emulsion of the present
invention, an organic modified mineral clay previously treated (including
commercial product) also may be employed, but if a control of the
viscosity by controlling the formulation ratio of the water-swellable clay
mineral and the quaternary ammonium salt type cationic surfactant is
desired, the application range is broader if these components are
formulated separately. The method for preparing the emulsified composition
of the present invention may be practiced by previously treating the
water-swellable clay mineral with the quaternary ammonium salt type
cationic surfactant and then formulating the oil components to effect
thickening, followed by an emulsification of water and the polyhydric
alcohol therein, or alternatively by adding the water-swellable clay
mineral to the water and polyhydric alcohol phase to effect swelling and
dispersion, followed by an emulsification by adding a homogeneous mixture
prepared previously by introducing the quaternary ammonium salt type
cationic surfactant and the polyoxyalkylene modified organopolysiloxane
into the oil phase.
EXAMPLES
The present invention will now be further illustrated by, but is by no
means limited to, the following Examples, wherein all parts and
percentages are expressed on a weight basis unless otherwise noted.
Example 1-1: Moisture cream
______________________________________
(1) Squalane 20.0
(2) Cetyl isooctanoate
8.5
(3) Petrolatum 1.5
(4) POE (12) dioleate 2.0
(5) Flavor q.s.
(6) Ethyl parahydroxybenzoate
0.2
(7) Sodium hyaluronate
0.01
(8) Glycerine 10.0
(9) 1,3-butylene glycol
5.0
(10) Veegam 1.5
(11) Purified water balance
______________________________________
Preparation Method
The components (1)-(6) were dispersed by mixing to prepare previously an
oil phase, and a solution prepared by homogeneously dissolving the
components (7) to (11) was then added gradually to the oil phase, with
stirring by a disper, to obtain the desired moisture cream.
Example 1-2: Hand cream
______________________________________
(1) Dimethylpolysiloxane 30.0
(average polymerization degree = 9)
(2) Liquid paraffin 10.0
(3) Microcrystalline wax 2.0
(4) Polyether modified silicone
3.0
compound (having the structure of
formula A, containing 20% of polyoxy-
ethylene group and having an average
molecular weight of 6000)
(5) Butyl parahydroxybenzoate
0.1
(6) Glycerine 20.0
(7) Saponite 2.0
(8) Purified water balance
______________________________________
Preparation Method
The desired hand cream was obtained similarly as in Example 1-1.
Example 1-3: Pre-make-up cream
______________________________________
(1) Squalane 23.0
(2) Decamethylcyclopentasiloxane
5.0
(3) Microcrystalline wax 2.0
(4) Polyether modified silicone
1.0
compound (having the structure of
formula A, containing 20% of the
polyoxyethylene group and having an
average molecular weight of 6000)
(5) Diglyceryl diisostearate
1.0
(6) Butyl parahydroxybenzoate
0.1
(7) Flavor q.s.
(8) Titanium oxide 1.0
(9) Colored pigment 0.1
(10) Dipropylene glycol 5.0
(11) Kunipia 2.5
(12) Purified water balance
______________________________________
Preparation Method
The desired cosmetic base cream was obtained as in Example 1-1.
The results of tests of the viscosity and stability of Examples 1-1 to 1-3
are shown in the following table.
______________________________________
0.degree. C.
25.degree. C.
50.degree. C.
Test Vis- Vis- Vis-
items cosity Sta- cosity
Sta- cosity
Sta-
Sample cps bility cps bility
cps bility
______________________________________
Example 1-1
320 + 280 + 200 +
Example 1-2
280 + 240 + 180 +
Example 1-3
470 + 410 + 360 +
______________________________________
Viscosity: measured by a cone plate type viscometer at a shear rate of
1700 sec.sup.-1
Stability:
+: no separation observed
.+-.: some separation of liquid phase (oil phase or aqueous phase)
observed
-: remarkable separation of liquid phase observed
Example 2-1: Hand cream
______________________________________
(1) Decamethylcyclopentasiloxane
12.0
(2) Liquid paraffin 10.0
(3) Organic silicone resin
5.0
(average formula: (CH.sub.3).sub.1.60 SiO.sub.1.20
molecular weight: about 3000)
(4) Polyoxyalkylene modified
4.0
organopolysiloxane*.sup.1
(5) Distearyldimethylammonium chloride
0.8
(6) Vitamin E acetate 0.1
(7) Ethylparahydroxybenzoate
q.s.
(8) Flavor q.s.
(9) Purified water 55.7
(10) Polyethylene glycol 4000
| | |
