JPH01261318A - Pack cosmetic - Google Patents

Abstract

PURPOSE:To obtain a pack cosmetic having an extremely short coating film formation time, large percutaneously absorbing action of skin activating component and providing the skin with a feeling of proper tension, containing a water- dispersible emulsion of trans-1,4-polyisoprene. CONSTITUTION:A pack cosmetic containing a water-dispersible emulsion of trans-1,4-polyisoprene having 200,000-500,000 molecular weight, especially 400,000-1,300,000 molecular weight as a pack film forming agent. The water- dispersible emulsion, for example, is obtained by dissolving trans-1,4-polyisoprene in a solubilizing organic solvent (e.g., benzene, carbon tetrachloride or THF), emulsifying the solution with an aqueous solution of a surfactant and removing the solvent used at low temperature under reduced pressure. In drying and forming a film of trans-1,4-polyisoprene, a skin activating component, etc., contained in a water-dispersible emulsion are pushed outside, efficiently brought into contact with the skin to exhibit excellent effects as pack.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to cosmetic packs for the face or the whole body, such as facial bags or body banks.

- [Conventional technology] In recent years, technology related to cosmetics has made remarkable progress, and a large number of pack cosmetics have been developed, most of which are (1) vinyl packs using polyvinyl alcohol as a coating agent, (2)
) Mud pack agents mainly contain inorganic powders such as talc and bentonite; and (3) paraffin pack agents that use low-melting paraffin wax. It is well known that the following effects are expected from these pack cosmetics.

That is, ■ Provides an appropriate tension window to the skin by forming a film, etc.

■ Increases skin temperature by forming a film, improving sweating and blood circulation.

■ The adsorption effect of the coating agent removes dirt from the skin surface and cleanses the skin.

■ Increases transdermal absorption of skin-activating ingredients, etc.

etc.

In addition, the following points are important as conditions to be met for use.

1) Easy to apply to the skin and harmless.

2) The film pack material dries quickly.

3) The coating should be easy to peel off.

Examples include.

(Problems to be Solved by the Invention) However, with conventional film pack cosmetics, the drying time is long, and the drying time is about 10 to 20 degrees, which puts a burden on the user. In terms of efficacy, there are drawbacks such as low skin tension and poor transdermal absorption of skin-stimulating ingredients, and it has been a challenge to overcome these drawbacks.

(Means for Solving the Problems) In order to solve the above problems, we adopted a means for creating a pack cosmetic containing a water-dispersible emulsion of trans-1,4-polyisoprene water as a pack coating agent. This is what I did. The details will be described below.

First, the trans-1,4-polyisoprene of this invention is a polymer whose repeating unit is -CHzC=CCHz-H,C, and the trans-1,4-polyisoprene having the same 1,4-polyisoprene bond. 4-Polyisoprene, the repeating unit, is in a stereoisomeric relationship with the polymer. and cis-1
,4-polyisoprene is a typical rubber elastic body like natural rubber, but trans-1,4-polyisoprene is a crystalline thermoplastic polymer, and trans-1,4-polyisoprene used in this invention The molecular weight of polyisoprene is preferably from 200,000 to 1.5 million, more preferably from 400,000 to 1.
It is within the range of 300,000. This is because if the molecular weight is lower than this range, the strength of the formed film will be low, the tension given to the skin will be weak when used as a pack, and the bank will be easily torn when removed from the skin. On the other hand, if the molecular weight is higher than the above range, the process efficiency for polymerization and obtaining a water-dispersible emulsion of this polymer will deteriorate, which is undesirable because it will be difficult to manufacture.

Next, as a typical trans-1,4-polyisoprene used in this invention, TP-301 manufactured by Kuraray can be exemplified, and its fishing properties are shown in Table 1. Physical properties of the film formed by (measurement temperature 25°C, test piece Son thickness, 20mm
am, tensile speed 500 w/min) are shown as examples in Table 2.

Table 1 Table 2 Furthermore, the water-dispersible emulsion of trans-1,4-polyisoprene of the present invention is prepared by dispersing trans-1,4-polyisoprene in a soluble organic solvent such as benzene, toluene, carbon tetrachloride, tetrahydrofuran. It is obtained by dissolving in trichlorethylene, chlorobenzene, chloroform, carbon disulfide, turpentine oil, naphtha, mineral turpentine, etc., emulsifying it with a commercially available surfactant aqueous solution, and removing the organic solvent used at low temperature and reduced pressure. The method is not particularly limited as long as the trans-1,4-polyisoprene is dispersed in water in the form of an emulsion.

In addition, medicinal ingredients, humectants, preservatives, preservatives, fragrances, etc. that have been widely used in the cosmetics industry can be appropriately added to the pack cosmetic of the present invention, and other ingredients can also be added as necessary. Additives may also be added.

[Effect]

The water-dispersed emulsion of trans-1,4-polyisoprene of the present invention is based on a different mechanism of action from conventional vinyl packs. That is, the conventional film-forming pack raw material is made by dissolving a polymer compound in water, and the polymer itself hydrates with water, thereby incorporating and dissolving water. Therefore, the drying time is also inevitably longer.

On the other hand, the water-dispersible emulsion of trans-1,4-polyisoprene of the present invention has water-insoluble trans-1,
Since 4-polyisoprene is stabilized by dispersing it in water using a surfactant, the amount of water dissolved in the polymer is extremely small. Therefore, when used as a pack, water evaporation or volatility is good and drying time can be shortened. Since trans-1,4-polyisoprene is crystalline, the skin-activating ingredients added to this water-dispersible emulsion are extruded out during dry film formation, and the extruded skin-activating ingredients are added to the water-dispersible emulsion. As a result of efficient contact with the skin, it becomes effective as a pack.

Moreover, since trans-1,4-polyisoprene is a crystalline polymer and has a double bond in its main chain, it exhibits rubber-like behavior and has elasticity. For this reason, when used as a puncture, it always applies appropriate pressure to the skin, creating a feeling of tension and being effective in smoothing out wrinkles.

As mentioned above, packs using trans-1,4-polyisoprene have short drying time for film formation, provide a moderate feeling of tension when used, and at the same time promote blood circulation and increase transdermal absorption. It shows the effect.

【Example〕

Example 1 Nidoran-1,4-polyisoprene (Kuraray TP-30
1) Add 50 parts of toluene and 0.5 parts of polyoxyethylene lauryl ether (6, E, O,) to 10 parts and make 70 parts.
The mixture was heated and dissolved at 0.degree. C., and 39.5 parts of purified water at the same temperature was added thereto, followed by emulsification for 10 minutes in a homomixer (3000 rpm) shown in Table 3.

This was then cooled to 50°C and heated under reduced pressure (5 to 10 mm
1 g) to remove toluene to obtain a water-dispersible emulsion of trans-1,4-polyisoprene. The physical properties of this product are shown in Table 3.

Example 2 and Comparative Example 1: Water was added to the water-dispersible emulsion of trans-1,4-polyisoprene obtained in Example 1 to prepare a solution with a solid content of 20 w/w%. Manufactured by Kagaku Kogyo:
Prepare a 20 w/w % aqueous solution of Gohsenol25), apply both samples to a glass plate in an amount of 0.1 g/d in a room at a temperature of 24 to 26 ° C, and 62%, and dry. The time was measured. The results are shown in Table 4. (Number of repetitions: 3 times) As is clear from the results in Table 4 and above, the drying time of the water-dispersible emulsion of trans-1,4-polyisoprene according to the present invention is the same as that of vinyl packs, which are typical of ordinary film packs. It was found that the drying speed was considerably shorter when compared to

Example 3: To 97.88 parts of the water-dispersible emulsion of trans-1,4-polyisoprene of Example 1, methyl hydroxybenzoate o,
t part, phosphorus M-L-ascorbyl magnesium 1.0
1 part, 0.02 parts of fragrance, and 1 part of glycerin were added and uniformly dissolved to prepare a facial pack (mousse), and a foamy aerosol thereof was prepared under the following conditions. This product had a short drying time, good tension and a good usability window.

(Preparation conditions of foam aerosol) Pack stock solution: 3B, h (95wt%) 43.4m
1 (91,9vo1%) propellant: 2. Og (5wt%
) 3.8m1 (8,1vo1%) Propellant composition: LP
01.0 kg/c4 total 40.0g
47.2ml (characteristics of foam aerosol) Flammability category: Flame retardant product Pressure (25°C): 3.0-3.5 kg/
c+a injection flammability test 20 mark injection amount (25°C): 1.3 to 1.6 g/se
c Example 4: To 97.85 parts of the water-dispersible emulsion of trans-1,4-polyisoprene of Example 1 was added 0.8 parts of methyl paraoxybenzoate.
1 part of water-soluble collagen, 2 parts of water-soluble collagen, and 0.05 part of fragrance were added and uniformly dissolved to prepare a body pack for whole body skin. The viscosity (25°C) of this product is 680 cp, which is
When applied all over the body with a brush, the drying time was short, and the feeling of tightness and application area were good.

〔effect〕

The pack cosmetics of this invention are commercially available film-type vinyl pack cosmetics C111 (for face), talc/bentonite mud pack cosmetics (for face or whole body), and paraffin wax-based pack cosmetics (for whole body). It shows the following excellent effects compared to

(1) Since it dries quickly, the film formation time is very short and does not put a burden on the user.

(Compared to film-based vinyl packs) (2) The transdermal absorption effect of skin-activating ingredients is large.

(Compared to film-based vinyl bags, talc/hentonite packs, and paraffin wax packs) (3) Appropriate skin tension, giving a sense of satisfaction.

(Compared to talc/bentonite-based packs and paraffin wax-based packs) (4) Easy work as there is no need to melt paraffin wax and control the temperature or prepare in advance like talc/bentonite-based packs. is good.

In addition, it has well-balanced properties such as cleansing effect and moisturizing effect that pack cosmetics originally have, and its application range is wide, including the face and the whole body.

Claims (1)

[Claims] (1) A pack cosmetic comprising a water-dispersible emulsion of trans-1,4-polyisoprene as a pack coating agent.