JPH049319A - Cosmetic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Ru.

Prior art US Pat. No. 4,722,943 discloses composite hollow particles in which fine inorganic particles are attached to the surface of a hollow spherical polymer. However, this U.S. patent provides a technology for foaming microspheres in the presence of inorganic fine particles in order to prevent the particles from agglomerating when foaming microspheres. The present invention is not aimed at obtaining composite hollow particles per se, nor does it disclose any inherent usefulness of the composite hollow particles themselves.

On the other hand, the slipperiness, feel, spreadability, adhesion, covering properties of cosmetics,
Techniques for incorporating fine powder into cosmetics have been proposed for the purpose of absorbing sweat, etc., spreading on the desk, and sustaining effects. For example, as a new technology using inorganic fine powder, Japanese Patent Publication No. 61-39349 describes a method of blending colored porous powder into cosmetics in which the surface of porous powder is impregnated with polyvalent metal hydroxide, and an organic fine powder. JP-A-59-181205 discloses a method using a spherical fine powder made of acetic acid cotton, and JP-A-60184004 discloses a method using a hollow spherical polymer.

However, organic fine powders often have problems with coverage, while inorganic fine powders tend to be heavy and lack elasticity, giving them a poor feel to the touch. There is a need for the development of new materials.

Problems to be Solved by the Invention An object of the present invention is to provide a cosmetic that is lightweight, elastic, and has excellent concealing properties, covering properties, texture, etc.

Means for Solving the Problems The present invention relates to a cosmetic compounding material containing composite hollow particles formed by adhering inorganic fine powder to the surface of a hollow spherical polymer, and a cosmetic material containing this compounding material.

The hollow spherical polymer used in the present invention is obtained by thermally expanding thermally expandable microcapsules obtained by the method disclosed in, for example, Japanese Patent Publication No. 42-26524, Japanese Patent Publication No. 60-21770, etc. be able to.

That is, a hexamer having a polymerizable unsaturated bond is mixed with a volatile swelling agent and a polymerization initiator, and this is polymerized in an aqueous medium containing a suitable emulsifying and dispersing agent to obtain thermally expandable microcapsules. It can be obtained by thermally expanding it by heating it. When thermally expandable microcapsules are heated together with inorganic fine powder as described in the above-mentioned U.S. Pat. particles can be obtained.

Volatile expansion agents include aliphatic hydrocarbons such as ethane, ethylene, propane, butane, isobutane, butene, isobutyne, neopentane, acetylene, hexane, heptane, halogenated hydrocarbons such as trichlorofluoromethane, dichlorofluoromethane, and tetraalkyl. Examples include low boiling point compounds such as silane.

Thermoplastic polymers constituting microcapsules include acrylic acid, methacrylic acid, itaconic acid, citraconic acid,
Maleic acid, fumaric acid, vinylbenzoic acid or their esters, acrylonitrile, methacrylonitrile,
Styrene, vinyl chloride, vinylidene chloride, vinyl acetate,
Examples include monopolymers or copolymers of monomers such as vinyl butyrate.

Particularly preferred polymers are copolymers of two or more heptamers selected from acrylic acid, methacrylic acid or their esters, acrylonitrile, vinylidene chloride, methacrylonitrile, and the like.

These electrolyte compounds may be crosslinked with divinylbenzene, ethylene glycol dimethacrylate, triacryl formal, or the like.

Thermally expandable microcapsules can be obtained by a method such as emulsion polymerization of the above-mentioned heptamers in an aqueous medium in the presence of the above-mentioned blowing agent, together with a crosslinkable supertumer if necessary. This method is described in detail in Japanese Patent Publication No. 42-26524.

The thermally expandable microspheres preferably have an average particle size of 1 to 100 μm, preferably 1 to 50 μm, and are heated and expanded to form hollow spherical polymers with an average particle size of 2 to 500 μm, more preferably 2 to 300 μm. Bye. The average particle size herein refers to the particle size at the 50% point of the cumulative distribution of the particle size distribution measured with a laser diffraction particle size distribution analyzer (eg, JEOL Ltd. HERO5 & RODO3).

In the present invention, composite hollow particles can be produced by a method such as heating and expanding thermally expandable microspheres in the presence of an inorganic powder. Such a method is described, for example, in US Pat. No. 4,722.94.3. Specifically, it can be obtained, for example, by mixing a water-containing cake or dried product of thermally expandable microcapsules and an inorganic powder in an arbitrary ratio, and heating the mixture by an appropriate method. For heating, a general contact heat transfer type or direct heating type mixing dryer may be used.

As for its functions, it is preferable to have the ability to adjust the temperature, disperse and mix raw materials, and optionally have a pressure reducing device or a cooling device to speed up drying.

The heating temperature is preferably about 60 to 200°C, more preferably about 90 to 150°C, depending on the type of the thermally expandable capsule.

Any inorganic fine powder may be used as long as it can be used for cosmetics. Specific examples include talc, sericite, kaolin, titanium oxide, mica, and silica. The preferred particle size of the inorganic fine powder is 0.01 to 0.01 in average particle size.
The particle size is 500 μm, more preferably 0.01 to 300 μm, and particularly, when the average particle size of the hollow spherical polymer is 100, the particle size is 01 to 100, more preferably 1 to 70.

The shape of the inorganic fine powder is not particularly limited, and the desired physical properties, especially the feel, elongation, and elongation when compounded with composite hollow particles in cosmetics.
The material may be selected in consideration of slipperiness, covering properties, etc. Generally, substantially spherical inorganic particles may be used. Even if the surface of the fine powder has sharp protrusions or ridgelines, irritation to the skin is suppressed by the flexible hollow spherical polymer compared to when the fine powder is used alone.

The blending ratio of hollow spherical polymer and inorganic fine particles is 5:9 by weight.
5 to 50:50 is preferred, especially 10:90 to 40:6
0 is preferred.

The composite hollow fine powder of the present invention may be blended into cosmetics in place of conventional inorganic fine powders or organic fine particles.

Hereinafter, the present invention will be explained in detail with reference to Examples.

Reference example 1 (manufacture of composite hollow particles (1)) Kenpan Boeki Co., Ltd.
Matsumoto Microsphere-F- for Loedige Mixer
30D (Note 1) and titanium oxide (Note 2), weight ratio 15/8
After mixing for 3 minutes, the jacket temperature was increased to 14.
The mixture was heated at 0°C for 10 minutes and then cooled at a temperature of 90°C to obtain composite hollow particles (1).

The obtained composite hollow particles (1) had a true specific gravity of 0.3, an apparent specific gravity of 0.15, and a particle size of 20 to 40 μm. These particles had both the concealing properties of titanium oxide and the elasticity of hollow particles. When a titanium oxide aqueous paint was prepared using the obtained composite hollow particles, the hiding power did not decrease even when the paint was replaced with 20VO1% titanium oxide.

Note 1 = thermally expandable microspheres with an average particle size of 15 μm and true specific gravity d = 1.1, whose shell component is vinylidene chloride/acrylonitrile copolymer.

Note 2 = Average particle size 0.2. um, true specific gravity d = 4.2° Reference Example 2 (Production of composite hollow particles (2)) Matsumoto Microsphere F-30 was added to a Loedige mixer (continuous type).
(Note 3) / Talc (Note 4) were continuously supplied at a weight ratio of 15/85, and the temperature of the salmon was 140°C, the residence time was 20 minutes, and the water was released! Thermal expansion was carried out continuously at a temperature of 90°C. The obtained composite hollow particles (2) had a true specific gravity of 0.2, an apparent specific gravity of 0.11, and an average particle diameter of 20 μm.

It was a compressible powder with the smoothness of talc and had a load capacity of 300 kg/cm2.

Note 3: Average particle diameter of 15 μm with vinylidene chloride/acrylonitrile copolymer as the shell component, d=l.

■Thermally expandable microspheres.

Note 4 = Average particle size approximately 4 μm 1 True specific gravity d = 2.8° Example 1 (Face powder) Prescription A (Powder formulation) Part by weight (%) Composite hollow particles 1 20 (54) Nylon powder
3 (8,1) Sericite
5 (13,5) Talc 4
．． 4(11,9) Bengara 0.2(
0,5) Yellow iron oxide 0.1(0,3
) Prescription B (Fluid formulation) Part by weight (%) Liquid paraffin 0.5 (1,4) Glycerin
2-ethyl 1.0 (2,7) hexylate isopropyl myristate 2.5 (6,8) Formulation C
(Fragrance) Part by weight (%) Mixed fragrance
0.3(0,8)A was mixed in a Henschel mixer and then ground in a grinder. While stirring this again with the Henschel mixer, B was added thereto, and the mixture was stirred and mixed for 10 minutes, and then C was added and mixed for 3 minutes. When the powder was homogenized using a blower sifter and used as a face powder, it had a soft and smooth feel, was lightweight, and applied well to the skin evenly.

Example 2 (Pressed Powder) Formulation A (Powder Formulation) Weight Parts % Composite Hollow Particles (2) 3 (3,7) Talc
50 (61,7) Sericite
l 5 (18,5) aluminum stearate 3.5 (4,3) kaolin
3.7 (4,6) Bengara
0.3 (0,4) Hoshigoutan (Liquid prescription)
Part by weight % Suffuran 2.0 (2,
5) Glycerin-2-3,0(3,7) Ethyl-hexylate formulation C (fragrance) Part by weight % Mixed fragrance
0.5(0,6)A was stirred and mixed using a ribbon blender for 30 minutes, and then ground using a grinder. While stirring the pulverized product using a Henschel mixer, B was added thereto and mixed for 12 minutes. Furthermore, C was added and mixed with stirring for 4 minutes. It was homogenized using a blower sifter to obtain pressed powder. It felt soft and light to use.

Example 3 (Emulsified foundation) Formulation A (Powder formulation) Part by weight % Composite hollow particles (1)
1.0 (1,0) stearic acid
2.0(2,1) Soufuran 1
．． 5(1,6)stearyl alcohol 2.0(
2,1) 2-octyldodecyl 4.0(4,2
) Myristate Activator 5.0 (5,3) Colored Pigment Paste 18.0 (18,7) Butylparaben 0.1 (0,1) BHT
O,05 (0,05) Formulation B (Liquid Formulation) Part by Weight % Propylene Glycol
5.0 (5,2) Methylparaben 0.2
(0,2) Triethanolamine O',7(0
,7) Purified water 55.95 (58,2
5) Prescription C (fragrance) Weight part % Mixed fragrance 0.5 (0,5) Dissolve A by heating while stirring at 75°C, disperse uniformly, and keep warm.

Heat B to 80°C and keep warm. The heated B is gradually added to A to emulsify it, the temperature is maintained for 10 minutes and stirred, and then the mixture is cooled to 45° C. with stirring. At this time, C was added, stirring and cooling was continued to 35°C, and the emulsification was taken out and used as a foundation. Provides a soft and smooth feeling of use.
child.

Effects of the Invention The composite hollow particles used in the present invention contain air, can be made lightweight, and can be adjusted to a desired specific gravity, so they can be used as particles for various cosmetics. In addition, these composite hollow particles are elastic and have a compression recovery function, as well as the characteristics of inorganic particles, so they are non-irritating to the touch and have excellent slipperiness, stretchability, adhesion, and covering properties. There is. Furthermore, it is possible to obtain a cosmetic that has excellent long-lasting effects and excellent absorption of sweat and the like.

Patent applicant: Matsumoto Yushi Pharmaceutical Co., Ltd.

Claims (1)

[Claims] 1. A compounding material for cosmetics containing composite hollow particles formed by adhering inorganic fine powder to the surface of a hollow spherical polymer. 2. The average particle size of the hollow spherical polymer is 2 to 500 μm, the average particle size of the inorganic fine powder is 0.01 to 500 μm, and the average particle size of the latter is 100. The cosmetic compounding material according to claim 1, which has a molecular weight in the range of 0.1 to 100. 3. A cosmetic containing the compounding material according to claim 1 or 2.