JPH0672852A - Skin-protecting composition - Google Patents

Abstract

PURPOSE:To provide a skin-protecting composition which has high effect of protecting the skin from kitchen work and skin washing with good application feeling free from greasy touch by using a specific oil preparation and a specific organopoly-siloxane. CONSTITUTION:The objective composition contain an oil preparation which is liquid at 25 deg.C, for example, a polyether-modified silicone oil or squalane and an organopolysiloxane of formula I and formula II (R<1>, R<2> are 1 to 4C alkyl; R<3> is 1 to 40C alkyl, alkenyl, fluoroalkyl; R<4> is 7 to 40C alkyl, alkenyl, fluoroalkyl; l is 2 or more; m is 3 or more and l+m is 5 to 6,000) in a total amount of more than 20wt.% based on the whole oil components. The weight ratio of the oil preparation to the organopoly-siloxane is 10:1 to 1:5. In addition, aqueous components, emulsifier, preservative, antioxidant, perfume and powder are suitably added to produce solid, paste, water-in-oil or oil-in-water emulsion preparations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin protectant composition which prevents skin roughening during water work, skin washing processes, etc. and protects the skin. More specifically, it is less irritating or sticky and has a good feeling in use. It relates to a skin protectant composition.

[0002]

2. Description of the Related Art Conventionally, hand creams have been widely used for the purpose of protecting the skin from rough skin caused by water work. The hand cream serves to replenish sebum lost by water work and the like, and also to protect the skin by blending a moisturizer to replenish the skin with an appropriate amount of water. However, conventional hand creams tend to give a sticky feeling to the skin after use, and are easily washed off by washing with water, so that the skin protecting effect is not always satisfactory. For this reason, many housewives suffer from rough hands because they frequently perform water work such as cooking and washing. In addition, many beauticians complain of inflammation due to hair dye, perm solution, etc. in addition to rough hands caused by repeated shampooing. As a skin protective agent that has improved the drawbacks of such conventional hand creams, for example, an acrylic polymer composed of ethyl acrylate and methacrylic acid and a cellulose derivative dissolved in hydrous alcohol have been proposed (Japanese Patent Publication No. 2-9006). However, this skin protectant has an acrylic polymer as its main component that is soluble in alkali,
When cleaning the skin with soap, which is widely used as a base for skin cleansing agents, or when it comes into contact with perm solution, which is usually alkaline, it has the drawback that its protective function is not sufficient. .

[0003]

Therefore, the present invention forms a film with good spreadability and less sticky feeling, and is not easily washed off by water work or a skin washing process using soap. It is an object to provide a skin protectant composition capable of protecting the skin for a long time.

[0004]

Under such circumstances, as a result of intensive studies by the present inventors, as a result of using a specific oil agent and a specific organopolysiloxane in combination at a specific ratio as an oily component, the above-mentioned requirements were met. It was found that a skin protectant composition satisfying the above conditions was obtained, and the present invention was completed.

That is, the present invention provides the following components (A) and (B): (A) an oil agent which is liquid at 25 ° C., (B) in a molecule.

[0006]

[Chemical 2]

(R ¹ and R ² each represent an alkyl group having 1 to 4 carbon atoms, and R ³ represents a linear, branched or cyclic alkyl group having 1 to 40 carbon atoms, an alkenyl group or a fluoroalkyl group. , R ⁴ represents a linear, branched or cyclic alkyl group, alkenyl group or fluoroalkyl group having 7 to 40 carbon atoms, l represents a number of 2 or more, m represents a number of 3 or more, and further l + m = 5 to 6000) in an amount of 20% by weight or more in all oily components, and (A) :( B) in a weight ratio of 10: 1 to 1: 5.
The present invention provides a skin protective composition.

The liquid oil which is the component (A) of the present invention is not particularly limited as long as it is an oil agent which is liquid at 25 ° C., for example, a volatile cyclic silicone such as a four-membered ring and a five-membered ring, 1 to
Dimethyl polysiloxane of 1000cs, methylphenylpolysiloxane of 1000cs or less, squalane, hydrocarbons such as liquid paraffin, branched alcohols, branched fatty acids, higher fatty acid esters, benzoic acid esters, triglycerides, diglycerides, rosin derivatives Etc.

Here, the liquid state at 25 ° C. means 25 ° C.
Put the sample up to the height of A line in a constant temperature water tank with a flat bottom test tube with an inner diameter of 30 mm and a height of 120 mm marked with 55 mm (A line) and 85 mm (B line) heights from the bottom of the tube. After leaving the sample at 25 ° C. for 10 minutes or more, it is laid on a horizontal table and the time until the liquid tip reaches the line B is within 90 seconds. In addition, these liquid oils can be used alone or in combination of two or more.

The organopolysiloxane of the component (B) used in the present invention improves the spreadability of the oil agent of the component (A), the sticky feeling, the poor feel of the skin after washing, and the water resistance of the composition. It has the action of improving the sexuality and durability, and has at least 3 carbon atoms of 7 to 4 in one molecule.
It has 0 hydrocarbon groups. This organopolysiloxane may be branched or cyclic.

R contained in the organopolysiloxane (B)
Examples of the alkyl group represented by ¹ and R ² include a methyl group,
Examples thereof include an ethyl group, n-propyl group, isopropyl group and n-butyl group, with a methyl group being preferred. The alkyl, alkenyl or fluoroalkyl group represented by R ³ and R ⁴ may be linear, branched or cyclic, but R ³ is an alkyl group having 1 to 4 carbon atoms. And R ⁴ is preferably an alkyl group, an alkenyl group or a fluoroalkyl group having 7 to 40 carbon atoms (more preferably 12 to 22 and particularly preferably 16 to 18). Specific examples of R ⁴ include octyl, nonyl,
Decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, triacontyl,
Tetratriacontyl, octatriacontyl, tetracontyl, 2-heptylundecyl, 2-undecylpentadecyl, 2-decyltetradecyl, 2-decylpentadecyl, 2-ethylhexyl, 2-octyldodecyl, 2-undecyl. Examples thereof include tetradecyl, methyl-branched isostearyl, methyl-branched dodecyl (propylene tetramer), and methyl-branched nonyl (propylene trimer) groups. Also, l + m is 5 to 6000, but 2
It is preferably from 00 to 3000, and further, l = m
= 150 to 750, and 1 + m is preferably 300 to 1500. Here, l and m are obtained as an average degree of polymerization calculated from the weight average molecular weight.

The organopolysiloxane (B) is
Those having a melting point of 10 to 50 ° C, particularly 20 to 40 ° C are preferable. The melting point of the organopolysiloxane was measured using a differential scanning calorimeter (DSC).

The organopolysiloxane (B) may have a structure having both of the above polysiloxane units at any position in the molecule, but from the viewpoint of easy production,
It is preferable that each unit is directly bonded to each one block, and both terminal residues are bonded to the unit to have a simple structure. Further, it is preferable that the both-terminal residues that are ^{-OSiR 5 R 6 R 7 (R} 5 ~R 7 represents an alkyl group having 1 to 4 carbon atoms). Specific examples of the organopolysiloxane (B) include those represented by the following general formula (1).

[0014]

[Chemical 3]

(In the formula, l, m and R ⁴ have the same meanings as described above.) A commercially available product represented by the general formula (1) is XF42-A71 manufactured by Toshiba Silicone Co., Ltd.
54, XF-A5048, XF42-A5047 and the like.

The components (A) and (B) are blended in the skin protectant composition of the present invention in a weight ratio of 10: 1 to 1: 5, preferably 3: 1 to. 1: 3
Is. When the amount of the component (A) exceeds 10 times the amount of the component (B), the feeling of use such as spreadability and stickiness deteriorates,
When the amount of the component (B) exceeds 5 times the amount of the component (A), the storage stability of the skin protectant composition of the present invention is reduced. Further, in the skin protectant composition of the present invention,
It is preferable that the total amount of the components (A) and (B) is 20% by weight or more based on the total amount of the oil component. It should be noted that the amphipathic substances such as glyceryl monostearate mixed for the purpose of emulsification are not included in the oily substance.

In addition to the above-mentioned essential components, the skin protectant composition of the present invention contains an aqueous component, an emulsifier, an antiseptic, an antioxidant, a fragrance, and the like, as long as the effects of the present invention are not impaired.
Various components such as a powder, etc. may be appropriately mixed to obtain various forms such as a solid form, a paste form, a water-in-oil type or an oil-in-water type emulsion.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. Example 1 Hand creams having the compositions shown in Tables 1 to 3 were produced. That is, among the components shown in Tables 1 to 3, all components except purified water were dissolved by stirring at 70 to 80 ° C, and then stirred at 70 to 80 ° C.
Purified water was added and cooled with continuous stirring to obtain each hand cream. For each obtained hand cream,
A practical test and a skin protection effect test were conducted based on the following test methods. The results are shown in Tables 1 to 3. (1) Practical test (panel test) Each of the hand creams was actually used by 10 professional panelists and their practical evaluation was performed. The evaluation items are 3 items: good spreadability during application, low stickiness, and moisturized hand skin after soap washing. The evaluation result complies with the following four-stage criteria.

⊚: 9 or more out of 10 respondents rated as good ○: 6 to 8 out of 10 respondents rated as good Δ: 3 to 5 out of 10 respondents responded in good ×: good Less than 3 out of 10 respondents

(2) Skin Protective Effect Test (Test Method and Evaluation Method) Evaluation of Protective Effect on Rough Skin A glass cup (inner diameter 2 cm) containing acetone / ether (volume ratio 1: 1) was placed on the inside of the forearm. Then, degreasing treatment was performed for 10 minutes to induce rough skin. The four types of samples shown in Table 1 were evenly applied to the rough skin (20 μl / 3.14).
cm ² ) and dried for 10 minutes. Next, attach cups again to the area where the skin protectant solution was applied to the rough skin and the area where it was not applied, and add 1.0 ml of the surfactant solution (0.1% polyoxyethylene (40 E.O.) hydrogenated castor oil). Rub the surface of the skin with a Teflon stick for 1 minute. After collecting the treatment solution, the detached keratinocytes were stained with basic fuchsin-crystal violet, and the number of cells was measured with a microscope. As a comparison, the same measurement was performed for the part (healthy skin) not subjected to the degreasing treatment. The result is the number of cells x 10 ⁴ cells / cm
^Shown with ³ . Since the number of cells is the number of shed cells, the smaller this number, the higher the effect of protecting the skin. That is, when this value is 0.8 or less, the skin health is very high, and when it is more than 0.8 and 1.4 or less, the skin health is normal. If it exceeds 0.4, it means that the skin is rough.

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

[Table 3]

[0024]

[Table 4] (Notes in Tables 1 to 3) 1): In the formula (1), l = 750, m = 750, R ⁴ = C
₁₈ H ₃₇ 2): In the formula (1), l = 500, m = 500, R ⁴ = C
₁₈ H ₃₇ 3): In the formula (1), l = 50, m = 50, R ⁴ = C ₁₈ H
₃₇ 4): In the formula (1), l = 500, m = 500, R ⁴ = C
₁₆ H ₃₃ 5): In the formula (1), l = 75, m = 75, R ⁴ = C ₁₆ H
₃₃ 6): In the formula (1), l = 750, m = 750, R ⁴ = C ₈
H ₁₇ 7): In the formula (1), l = 500, m = 500, R ⁴ = C
₂₂ H ₄₅ 8): Dow Corning Toray Silicone Co., Ltd. SH244 9): dimethylsiloxane-methyl (polyoxyethylene-polyoxypropylene) siloxane copolymer (Toray Dow Corning Silicone Co., BY- 22-0
12)

As can be seen from Tables 1 to 3, the skin protectant composition of the present invention has a better feeling in use and an excellent skin protecting effect as compared with the comparative product.

Example 2 Skin protection ointment

Table 5 (% by weight) (1) Squalane 70.0 (2) Cholesteryl isostearate 10.0 (3) Glycerin trimyristate 3.0 (4) Ceresin 2.0 (5) Octadecyl-modified silicone [Formula ( 1), R ⁴ = C ₁₈ H ₃₇ , l = 750, m = 750] 15.0

The components (1) to (4) were heated and dissolved at 70 to 80 ° C., then the component (5) was added with stirring, and the mixture was cooled with continued stirring to obtain a skin protection ointment. The ointment thus obtained spreads well and has a less sticky feeling, and the smoothness of the skin was maintained even after washing three times with soap.

Example 3 Emulsion

(Table 6) (% by weight) (1) Dimethyl polysiloxane (KF96, 6cs, manufactured by Shin-Etsu Chemical Co., Ltd.) 2.0 (2) Hexadecyl-modified silicone ¹⁾ 3.0 (3) Octamethylcyclotetrasiloxane 10.0 ( 4) Squalane 2.0 (5) Glyceryl monooleate 1.5 (6) Glyceryl monostearate 1.0 (7) Polyoxyethylene (20) sorbitan monostearate 1.5 (8) 1,3-butylene glycol 10.0 (9) Purified water balance 1): Hexadecyl-modified silicone [in the formula (1), l =
^{750, m = 750, R 4} = C 16 H 33 ]

(1) to (6) are mixed, heated and dissolved to obtain 7
Keep at 0 ° C and use as the oil phase part. Separately, (7) to (9) are dissolved by heating and kept at 70 ° C. to form an aqueous phase part. The oil phase portion is added to this water phase portion and sufficiently emulsified by an emulsifying machine. After emulsification, the product was cooled with stirring. The emulsion was a refreshing feel to use.

Example 4 Essence

(Table 7) (wt%) (1) Ethanol 10.0 (2) Tetradecyl-modified silicone ¹⁾ 2.0 (3) Carbopol 0.3 (4) Dimethylsiloxane-methyl (polyoxyethylene-polyoxypropylene) Copolymer 0.3 (5) Squalane 5.0 (6) Octamethylcyclotetrasiloxane 5.0 (7) Glycerin 10.0 (8) Dipropylene glycol 25.0 (9) Oleyl alcohol 0.2 (10 ) L-ascorbic acid 0.5 (11) Purified water balance 1): tetradecyl-modified silicone [in the formula (1), l =
^{750, m = 750, R 4} = C 14 H 29 ]

(1) to (11) are dissolved by heating at 70 ° C. This essence had a refreshing and moisturizing feel.

[0032]

Industrial Applicability As described above, the skin protectant composition of the present invention has a high effect of protecting the skin from water work, a skin washing process and the like, and has a feeling of use such as good spreadability and low stickiness. Is also excellent in.

Claims (1)

[Claims] 1. The following components (A) and (B): (A) an oil agent which is liquid at 25 ° C., (B) in a molecule: (R ¹ and R ² each represent an alkyl group having 1 to 4 carbon atoms, R ³ represents a linear, branched or cyclic alkyl group, alkenyl group or fluoroalkyl group having 1 to 40 carbon atoms, R ⁴ Represents a linear, branched or cyclic alkyl group, alkenyl group or fluoroalkyl group having 7 to 40 carbon atoms, l represents a number of 2 or more, m represents a number of 3 or more, and further l + m = 5 to 5 An organopolysiloxane having a content of 6000) in an amount of 20% by weight or more in all oil components,
(A) :( B) is a weight ratio of 10: 1 to 1: 5, The skin protectant composition characterized by the above-mentioned.