JPS61158910A - Skin cosmetic - Google Patents

Abstract

PURPOSE:To provide a skin cosmetic containing a specific organic silicone resin and a volatile hydrocarbon oil, spreadable easily over the skin, giving refreshing feeling to the skin, capable of protecting the skin for a long period, and resistant to washing with water. CONSTITUTION:The objective skin cosmetic contains (A) 1-90wt% organic silicone resin of formula (R is 1-6C hydrocarbon group or phenyl group; n is 1.0-1.8) and (B) 10-99wt% volatile hydrocarbon oil having a boiling point of 60-260 deg.C. The cosmetic gives refreshing feeling to the skin, is resistant to the transfer to the contacted material, and keeps the protective effect even by repeating the washing with water. The average molecular weight of the component A is preferably 1,500-10,000. The component B is e.g. Isopar A, Shellsol 71, etc., which are solvents of the component A.

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.

U Prior Art] Hand creams have conventionally been widely used to protect the 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 worried about their hands getting rough due to unusual water work such as cooking and washing clothes.

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 such work that requires particularly rough hands, there is
There is Publication No. 03, but since this product is a composition using an organosilicone resin and a relatively high viscosity trimethylsilyl end-capped diorganosiloxane, it has a strong sticky feeling when applied to the skin and does not adhere to objects that come in contact with it. It also has significant drawbacks.

[Problems to be Solved by the Invention] In view of the above circumstances, the present inventors have developed a method to effectively protect the skin from water work (in particular, the protective effect will not be lost even after repeated washing with water), and to As a result of intensive research with the aim of creating a skin cosmetic that has a light feel and less adhesion to objects it comes into contact with, we have found that if we use a volatile hydrocarbon oil in addition to a specific organic silicone resin. For example, it spreads easily and when applied to the skin, it gives a light feel as the hydrocarbon oil evaporates and protects the skin for a long time, forming a good draft 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 contains 1 to 90% by weight of an organic silicone resin shown in (A) below and 10 to 99% by weight of a volatile hydrocarbon oil shown in (B) below. A skin cosmetic characterized by containing:

(A) Average formula Rn5iO (R has 1 or more carbon atoms)
Represents a hydrocarbon group or a phenyl group up to 6, where n is 1.
An organic silicone resin consisting of units of 0 to 1.8).

(B) A volatile hydrocarbon oil having a boiling point in the range of 60 to 260°C at room temperature.

The organic silicone resin represented by (A) above used in the present invention consists of an appropriate combination of Rn5iO units, R2SiO units, R51O units and 5i02 units,
The proportions are selected to satisfy the average formula Rn 5iOE-'', where n represents a value from 1.0 to 1.8, and preferably have an average molecular weight of about 1,500 to 10,000.

The above organic silicone resin is soluble in benzene and can be produced by various methods. -For example, general formula R3Si
X, R25iX2, R51X3 and SiX4
(X is a hydrolyzable group, such as chlorine, bromine, fluorine,
A compound represented by alkoxy (e.g., methoxy, ethoxy, etc. group, acyloxy group) is added to a suitable solvent such as toluene, benzene, xylene, etc. depending on the desired resin composition, and then this solvent is mixed with a suitable solvent. Add in sufficient amount of water to obtain the desired hydrolysis and co-condensation in an acidic solvent. removing the aqueous phase from the resulting two-phase system and neutralizing the remaining resinous material with a sufficient amount of sodium bicarbonate or other alkaline substance;
By distilling off the solvent, the desired organic silicone resin can be obtained.

The amount of organic silicone resin blended in the present invention is 1 to 90% by weight based on the total amount of the skin cosmetic.

Further, the volatile hydrocarbon oil used in the present invention is a hydrocarbon oil having a boiling point in the range of 60 to 260"C at room temperature, such as Isopar (registered trademark) A, Isopar (registered trademark) C1 and
, same E, same G, same H1 same K, same, same M (Exxon)
, Shellzol (registered trademark) 71, (Shell), Tsurutrol (registered trademark) 100, 130, and 220 (Philip).

All of these are volatile and can act as a solvent for the 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 draftability. 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 ■ Isopar (registered trademark) E (boiling point 1) 6-143°C) 93 ■ Molecular weight of about 3000, and (CI + 3) 3 SiO unit: SiO2 unit -
o, s: average formula consisting of 1<C1+3),,33 S 1o144 Organosilicone resin 2■Methylphenylpolysiloxane 5■~■70
The mixture was stirred and dissolved at ~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 lotion ■ Isopar (registered trademark) A (boiling point 66-70°C) 50 ■ Tsurutrol (registered trademark) 220 (boiling point 240-260°C) 41 ■ Has a molecular weight of about 2000, and (CH3) 3 SiO Soil unit: λ (C6H5) 2 SiO unit: (Cs H5) SiO' unit: SiO2 unit = 0.9: 0.1: o, z:
Organic silicone resin represented by the average formula % formula % consisting of 1 4 ■ Olive oil 5 ■ ~ ■ 50
The mixture was stirred and dissolved at ~60°C and cooled to obtain a hand lotion.

Example 2 had a light feeling on use and had good water repellency.

Example 3 Hand cream ■Tsurutrol (registered trademark) 100 (boiling point 160-175℃) 15 ■Has a molecular weight of approximately 5000, and (C1)3) U SiO± Unit: Composed of SiO2 unit: 1.5:1 Average formula (CI+3) 1,9 Sio+.

Organic silicone resin represented by 65 ■ Microcrystalline wax 5 ■ Liquid paraffin 15 ■ ~ ■ at 70 ~ 80°
The mixture was stirred and melted at C and cooled to obtain a hand cream.

Example 3 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 3, the ingredients did not adhere.

Furthermore, Example 3 had excellent water resistance and maintained good water repellency even after washing with soap five times.

Example 4 Hand Moisture Lotion ■ Sherzol (registered trademark) 71 (boiling point 173-195°C) 30 ■ Has a molecular weight of about 8000, and on (Cs Hs ) SiO units: (CH3) 2 SiO units = 5.67 : Average formula % consisting of 1 Organosilicone resin represented by the formula % 40 ■ Sorbitan monooleate 5 ■ Water
22■ Dipropylene glycol 3■ to ■ were stirred and dissolved at 70 to 80°C, and to this was added the solution of ■ in ■ and emulsified to obtain a hand moisturizing 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 or the like. 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 comprising 0% by weight and 10 to 99% by weight of a volatile hydrocarbon oil represented by (B) below. (A) Average formula RnSiO_(_4_-_n_/_2_
) (R represents a hydrocarbon group having 1 to 6 carbon atoms or a phenyl group, and n represents a value from 1.0 to 1.8). (B) A volatile hydrocarbon oil having a boiling point in the range of 60 to 260°C at room temperature.