JPS63151351A - Water in oil type emulsified composition - Google Patents

Abstract

PURPOSE:To enhance the temp. stability and usability of a composition in a water in oil type emulsified composition useful as cosmetics or medicines, by using water-swellable clay mineral, a nonionic surfactant, an oil component and water as essential components. CONSTITUTION:A water in oil type (hereinbelow referred to as a W/O type) emulsion is prepared by compounding 0.2-5% or water-swellable clay mineral being one kind of colloidal aluminum silicate hydrate having a three-layered structure and 0.05-2 times by wt. of the water swellable clay mineral of a nonionic surfactant. An oil component can be widely adapted from polar oil to non-polar oil and compounded in an amount of 5-90wt% of the W/O type emulsion. In preparing a composition, for example, the water-swellable clay mineral, the oil component and the nonionic surfactant are mixed at about 70 deg.C under heating and stirring and an aqueous phase is added to the resulting mixture while stirring to prepare the emulsion having excellent storage stability over a wide temp. range.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides water-in-oil type (hereinafter referred to as W-type) useful as cosmetics and pharmaceuticals.
It is called type 2O. ) Regarding emulsified compositions, more specifically, oils that can be used in a wide range of oils, from polar oils to non-polar oils, as the external phase, and have the characteristics that the resulting emulsified compositions have extremely excellent temperature stability and usability. The present invention relates to a water-in-water emulsion composition.

[Prior art] Conventionally, in order to obtain a W10 type emulsion composition, HL was used as an emulsifier.
A lipophilic surfactant with a B value of 1 to 12, such as a polyhydric alcohol fatty acid ester active agent such as glycerin fatty acid ester or sorbitan fatty acid dister, is used, and about 0.4 to 5.0 g of the active agent is added to the oil phase. After adding and heating and dissolving at about 70 to 80°C, the aqueous phase heated to the same temperature is added and stirred with a homomixer etc. to form a W10 type emulsion composition (hereinafter referred to as W10 type emulsion). I was getting it.

[Problems to be solved by the invention] However, the W/○ type emulsion thus obtained is a system with superior temperature stability and usability compared to oil-in-water type (hereinafter referred to as 0/W type) emulsion. The disadvantage was that it was difficult to obtain. For example, regarding temperature stability,
At low temperatures, the oil phase, which is a continuous phase, tends to separate due to the aggregation of water droplets, and at high temperatures, the particle size increases due to the coalescence of water droplets and settles to the lower layer, resulting in oil phase separation where the upper layer is only the oil phase. Such phenomena are likely to occur. On the other hand, in terms of usability, since the external phase is oil, it has advantages such as protecting the skin and imparting flexibility in the cosmetics and pharmaceutical fields.
It has the drawbacks of being sticky when used and having a high skin occluding ability.

One way to improve temperature stability is to increase the viscosity by blending a large amount of wax into the oil phase.This method improves low temperature stability, but during high temperature storage, the blended wax The oil phase separation caused by the coalescence of water droplets cannot be sufficiently improved due to the softening and melting of the oil, and new problems with usability such as spread arise.

As a method to improve such usability problems, 0
/W-type emulsion system (preferably a polar oil component having an ester bond, etc.) is used, but it is preferable to use a conventionally used W/○-type emulsion system containing a polar oil component, which has excellent stability. It was difficult to produce W10 type emulsions.

The present inventors have conducted intensive research to improve the drawbacks of the prior art, and as a result, the W10 type emulsion, which has water-swellable clay minerals, nonionic surfactants, oil, and water as essential components, has been developed. It is an excellent Wlo type emulsion that can be emulsified even with a relatively small amount of ionic surfactant, has high viscosity even in systems containing polar oil, has good temperature stability, and provides smooth usability. The present invention was completed based on this finding.

[Means for Solving the Problems] That is, the present invention provides a water-in-oil emulsion composition containing a water-swellable clay mineral, a nonionic surfactant, an oil, and water as essential components. It is something to do.

The configuration of the present invention will be described below.

The water-swellable clay mineral used in the present invention is a type of colloidal hydrated aluminum silicate having a three-layer structure, and is generally represented by the following general formula % [[, and specifically, montmorillonite, savonite, hectorite, etc. Natural or synthetic (in this case, the (OH) group in the formula is substituted with fluorine) of the montmorillonite group (commercially available products include Veegum, Knivia, Laponite, etc.), sodium silicic mica, sodium or lithium tenio Synthetic mica known as Wright (commercially available products include Daimonite; manufactured by Tobie Gyo Co., Ltd., etc.). The blending amount is preferably 0.2 to 5%.

As the nonionic surfactant used in the present invention, its H
Examples include nonionic surfactants having an LB value (Note 1) of 2 to 16, more preferably 3 to 12.

(Note 1) The HLB value of the nonionic activator is calculated using the following equation.

W HL B = 7 + 11.7・log□ O (Here, Mw is the molecular weight of the base of the parent tree, M.

represents the molecular weight of the lipophilic group, respectively. ) To give a specific example, addition of 2 to 30 moles of polyoxyethylene (hereinafter P
Abbreviated as OE (2-30). Lt.
POE (2-35) nu f a') At aet k, POE
(2-20) lauryl ether, P OE (1-20
) Alkylphenyl ether, POE (6-18) behenyl ether, POE (5-25) 2-decyl pentadecyl ether, P OE (3-30) 2-decyl tetradecyl ether, P OE (8-16) 2- Ether-type activators such as octyl decyl ether, and P O
E (4-60) Hydrogenated castor oil, P OE (3-14
) fatty acid monoester, P OE (6-30) fatty acid diester, P OE (5-20) ester type activator such as sorbitan fatty acid ester, and further P OE (2-
30) Glyceryl monoisostearate, POE (10
~60) Glyceryl triisostearate, POE (7
~50) Hydrogenated castor oil monoinstearate, POE (
12-60) Ethylene oxide-added surfactants such as ether ester type surfactants such as hydrogenated castor oil triisostearate, and decaglyceryl tetraoleate, hexaglyceryl triisostearate, tetraglyceryl diisostearate, diglyceryl diisostearate, etc. Examples include polyhydric alcohol fatty acid ester type surfactants such as polyglycerin fatty acid esters such as isostearate, glycerin fatty acid esters such as glyceryl monostearate, glyceryl monoisostearate, and glyceryl monooleate. Among these, polyglycerin fatty acid esters higher than triglycerin such as decaglyceryl tetraoleate, hexaglyceryl triisostearate, and tetraglyceryl diisostearate, POE (2-12) oleyl ether, POE (3-12) stearyl ether,
POE (2-10) lauryl ether, POE (2-1
0) Nonylphenyl ether, POE (6-15) Behenyl ether, P OE (5-20) 2-decyl pentadecyl ether, P OE (5-17) 2-decyl tetradecyl ether, P OE (8-16) POE addition ether type activator such as 2-octyl decyl ether, OJ: HPOE (10-20) hydrogenated castor oil,
POE (5-14) oleic acid monoester, POE
(6-20) Oleic acid diester, POE (5-1
0) POE-added ester type activators such as sorbitan oleate, POE-added ether ester-type activators such as POE (3-15) glyceryl monoisostearate, POE (10-40) glyceryl triisostearate, etc. Particularly preferred are ethylene oxide-added nonionic surfactants.

Another type of nonionic surfactant used in the present invention is the following general formula (%).
→ Mouth Miko) Polyether-modified silicone compounds represented by 211-α − = are mentioned, and are particularly suitable when the oil is silicone oil or an oil containing silicone oil.

In carrying out the present invention, one or more of these nonionic surfactants may be arbitrarily selected and used. The blending amount is 0.05 to 2 for the water-swellable clay mineral.
Double doses are preferred.

The oil used in the present invention can be any of the common oils used in cosmetics, pharmaceuticals, etc., and can be used in a wide range from polar oils to non-polar oils. Examples of oils include hydrocarbon oils such as liquid paraffin, squalane, isoparaffin, and branched light paraffins, ester oils such as isopropyl myristate, cetyl isooctanoate, and glyceryl trioctanoate, decamethylcyclopentasiloxane, Examples include silicone oils such as dimethylpolysiloxane and methylphenylpolysiloxane. Further, waxes such as vaseline, microcrystalline, lanolin, peace wax, etc. can also be incorporated within the range that does not impair the effects of the present invention. The blending amount of these oils is about 5 to 90% by weight in the W10 emulsion,
10 to 80% by weight is preferred.

The W10 type emulsion of the present invention may contain amino acids and their salts, humectants, thickeners, preservatives, sequestering agents, ultraviolet absorbers, drugs, animal and plant extracts, as necessary, to the extent that the effects of the present invention are not impaired. Natural extracts, dispersants, fragrances, etc. can be added.

Examples of the above amino acids include alanine, arginine hydrochloride, asparagine monohydrate, aspartic acid, citrulline, glutamic acid, glutamic acid hydrochloride, glutamine, glycine, histidine, histidine hydrochloride, hydroxyproline, isoleucine, leucine, lysine, and lysine hydrochloride. , ornithine hydrochloride, proline, phenylalanine, serine, threonine, tryptophan, tyrosine, valine, dopa-1α aminobutyric acid, and the like. These are L
It consists of one piece, one piece D, and one piece DL.

Among these, particularly preferred are glycine, L-hydroxyproline, L-alanine, L-proline, and L-
The metals that form salts with serine are sodium,
Potassium, lithium, calcium, magnesium, etc.

To produce the water-in-oil emulsion composition of the present invention, for example,
Water-swellable clay mineral, oil and non-ionic surfactant
The oil and nonionic surfactant are mixed at about 70°C by heating and stirring at about 0°C, then adding the aqueous phase and stirring.
Examples include a method of heating and mixing, adding thereto an aqueous phase in which water-swellable clay minerals have been previously dispersed and swollen, and stirring.

[Effects of the Invention] The W10 type emulsion of the present invention is prepared by utilizing the combined W10 emulsifying action of a normal emulsifier and a water-swellable clay mineral, and the total combination of both functions as a W10 emulsifier. The amount may be as small as 0.25 to 5% by weight, and by controlling the amount or the ratio of the internal aqueous phase, it is possible to control the viscosity without adding a large amount of solidifying agent such as wax. It also allows the use of highly polar oils, which have traditionally been difficult to incorporate, and has excellent storage stability over a wide temperature range. The W10 type emulsion of the present invention, which has such great advantages, can be used in a wide range of fields such as cosmetics and pharmaceuticals by taking advantage of its characteristics.

[Example] Next, in order to further understand the present invention, the present invention will be described in more detail by giving examples. The present invention is not limited thereby. In examples, parts and % are all parts by weight and % by weight.
It is.

Example 1 Moisture cream (1) Squalane 20.0 (2
) Cetyl isooctanoate 8.5 (3) Vaseline P1.5 (4) POE (12) Diolet 260 (5) Fragrance appropriate amount (6) Ethyl paraoxybenzoate 0.2 (7) Sodium hyaluronate 0.01 ( 8) Glycerin
10.0 ('l) 1,3-butylene gelicol 5.0 (10) Veegum
1.5 (11) Purified water
Mix and disperse the remainder (manufacturing method) (1) to (6),
Prepare the oil phase in advance. Next (7) to (11)
A uniformly dissolved solution was gradually added to the oil phase while stirring with a disperser to obtain the desired moisture cream.

Example 2 Hand cream, (1) dimethylpolysiloxane 30.0 (
Average degree of polymerization = 9) (2) Liquid paraffin 10.0 (3
) Microcrystalline wax 2.0 (4) Polyether-modified silicone compound 3.0 (having the structure of general formula A, containing 20 polyoxyethylene groups, and having an average molecular weight of 6000) (5) Butyl rose hydroxybenzoate 0.1(6)
Glycerin 20.0 (7) Savonite 2.0 (8) Purified water
Residue (manufacturing method) A target hand cream was obtained according to Example 1.

Example 3 Makeup base cream (1) Squalane 23.0 (2
) Decamethylcyclopentasiloxane 5.0 (3) Microcrystalline wax 2.0 (4) Polyether-modified silicone compound 1.0 (having the structure of general formula A,
(5) Diglyceryl diisostearate 1.0 (6) Butyl parahydroxybenzoate 0.1 (7) Fragrance
Appropriate amount (8) Titanium oxide
i.

(9) Colored face 131 o,
t(10) dipropylene glycol 5.0(
11) Knibia 2.5 (11
) Water Remaining (manufacturing method) According to Example 1, one batch of the desired makeup base cream was prepared.

Next, test results of viscosity and stability of Examples 1 to 3: Stability 0: No separation observed Δ: Separation of liquid phase (oil phase or water phase) occurred X: Significant separation of liquid phase occured

Claims (1)

[Claims] (1) A water-swellable clay mineral, a nonionic surfactant,
A water-in-oil emulsion composition containing oil and water as essential components.