JPS6165808A - Skin cosmetic - Google Patents

Abstract

PURPOSE:To provide a skin cosmetic containing a specific organic silicone resin and a volatile silicone oil, having good spreadability, effective to protect the skin in kitchen work, giving refreshing feeling to the skin and causing little staining of the article touched with the hand. CONSTITUTION:The objective skin cosmetic contains (A) 1-90w% organic silicone resin composed of (i) the unit of formula I (R is 1-6C hydrocarbon group or phenyl group) and (ii) SiO2 unit at a ratio (i/ii) of (0.5-1.5)/1 and (B) 10-99wt% volatile silicone oil of formula II (n is integer of 0-3) and/or III (n is 4, 5 or 6). The cosmetic forms a water-repelling film resistant to washing with water, etc. by the dissipation of the silicon oil, and protects the skin for a long period while applying refreshing feeling to the skin..The form of the cosmetic can be selected from solution to cream by adjusting the ratio of the components.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a skin cosmetic, and more particularly to a skin cosmetic that protects the skin from rough skin (mainly rough hands) caused by water work or the like.

[Prior Art] Hand creams have conventionally been widely used to protect skin from roughness caused by water work, etc.

Hand cream replenishes sebum lost due to water work, etc., and also adds flexibility to the skin by incorporating moisturizers and water.

However, since hand creams are easily washed away by washing with water, their skin protection effects are not always satisfactory.

In fact, many housewives are troubled by the strain on their hands due to water work such as cooking and washing.

Dentists and others who frequently wash their hands often cannot use hand creams because they must not get it on treatment instruments or patients, resulting in rough hands and, in severe cases, unpleasant skin irritation.

In addition, many barbers and others complain of skin irritation from washing their hands, as well as irritation from hair dye and perm solution.

As a technology for skin protection materials for people who are engaged in jobs that require particularly rough hands, there is
No. 503, but since this product uses relatively high viscosity trimethylsilyl end-capped dioliganosiloxane and uses silica etc. as a composition, it has a strong sticky feeling when applied to the skin and does not stick to objects that come in contact with it. It also has disadvantages such as significant adhesion.

[Problems to be Solved by the Invention] In view of the above circumstances, the present inventors have developed a material that effectively protects the skin from water work (in particular, does not lose its protective effect even after repeated washing with water) and that can be used quickly. As a result of intensive research with the aim of creating a skin cosmetic that has a firm feel and less adhesion to objects it comes in contact with, we have found that if a specific organic silicone resin is used together with volatile silicone oil, it will spread easily. We have discovered that when applied to the skin, it protects the skin for a long time with a light feeling as the silicone oil evaporates, and forms a good water-repellent film that is not easily washed away by washing with water. Based on this knowledge, we have completed the present invention.

[Means for Solving the Problems] That is, the present invention uses 1 to 70% by weight of the organic silicone resin shown below (A) and volatile silicone oil shown below (B) based on the organic silicone resin. 0.5
It is a skin cosmetic product characterized by containing ~100% by weight (weight ratio).

(A) R3SiOy, unit (R represents a hydrocarbon group having 1 to 6 carbon atoms or a phenyl group): R35iO34 unit in which the ratio of Si02 unit is within the range of 0.5/1 to 1.5/1 and an organic silicone resin consisting of Si02 units.

(B) At least one type of volatile silicone oil represented by general formula (I) or general formula (II).

(Hereinafter in the margin) General formula (1) General formula (II) (Hereinafter in the margin) The organic silicone resin of the above (A) used in the present invention can be easily obtained by hydrolysis of the corresponding known silane.

The blending amount is 1 to 99% by weight based on the total amount of skin cosmetics.

Further, both the chain silicone oil and the cyclic silicone oil represented by the above general formula (r) or general formula (II) used in the present invention are volatile and can serve as a solvent for the above organic silicone resin.

The blending amount is 10 to 99% by weight based on the total amount of skin cosmetics.

Skin cosmetics containing the above-mentioned essential ingredients take on the form of a solution to a cream depending on the amount incorporated. That is, when there is a large amount of volatile silicone oil, it takes the form of a solution, and as the amount of organic silicone resin increases, it becomes solid.

Naturally, in addition to the above essential ingredients, by blending aqueous components and appropriate surfactants and making full use of emulsification technology, water-in-oil or oil-in-water emulsion compositions can be created without sacrificing water-fighting properties. It is also possible to turn it into an object.

In addition to the above, the skin cosmetics of the present invention may also contain oils and fats, waxes, drugs, fragrances, and other volatile ingredients, depending on the purpose and within a quantitative and qualitative range that does not impair the effects of the present invention. etc. may be blended.

Hereinafter, the present invention will be explained in more detail with reference to Examples. The present invention is not limited by these. All compounding amounts are weight %.

Example 1 Hand lotion ■Dimethylsiloxane 1.5cs (n = 2
) 93■(CH3) 3 Si0,3/5iO
2 = 0.8 / 1 2 organic silicone resin■Methylphenylpolysiloxane 5■～■
The mixture was stirred and melted at 70 to 80°C and cooled to obtain a hand lotion.

Example 1 had a light feeling when used, had good water-repelling properties, and had the effect of protecting the skin for a long time. Further, even if the hand coated with Example 1 touched a metal or the like, the components did not adhere.

Example 2 Hand cream ■Octamethylcyclotetrasiloxane 15■ (
CH co) Co SiOsi>/ Si02 ”0.5
/ 1 65 organic silicone resin ■ Microcrystalline wax 5 ■ Liquid paraffin 15 Example 2 was obtained according to Example 1.

Example 2 had a light feeling on use and had the effect of protecting the skin for a long time. Further, even when holding a tip with the hand coated with Example 2, no adhesion of the components was observed.

Furthermore, Example 2 had excellent water resistance, and had good water resistance even after washing with soap five times.

Example 3 Hand moisture lotion ■Decamethylcyclopentasiloxane 30■ (CH3) 3S
iO7. /5iO2=0.5 /1 40 organic silicone resin ■ Sorbitan monooleate 5 ■ Water 22 ■ Dipropylene glycol 3 ■ ~ ■ at 70 ~ 80°
The mixture was stirred and mixed at C, and a solution of (1) and (2) dissolved in (2) was added thereto and emulsified to obtain a hand moisture lotion.

[Effects of the Invention] The skin cosmetic of the present invention spreads easily, has a light feel when applied to the skin, protects the skin for a long time, and is not easily washed away by washing with water. Furthermore, it is a skin cosmetic that hardly sticks to the object even if it is touched by the hand to which it has been applied.

Claims (1)

[Claims] (1) Organic silicone resins 1 to 9 shown below (A)
1. A skin cosmetic containing 0% by weight and 10 to 99% by weight of a volatile silicone oil represented by (B) below. (A) R_3SiO_1_/_2 units (R is carbon number 1~
represents a hydrocarbon group or a phenyl group up to 6): SiO
R_3SiO_1_/_2 units and SiO_2 in which the ratio of _2 units is within the range of 0.5/1 to 1.5/1
Organic silicone resin consisting of units. (B) At least one type of volatile silicone oil represented by general formula (I) and general formula (II). General formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, n represents an integer from 0 to 3.) General formula (II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, n is 4 (Indicates an integer between ~6.)