JPH04187621A - Cotton-mediated pen-type oily eyeliner cosmetics - Google Patents

Abstract

PURPOSE:To provide the title cosmetic having good preservability, water resistance, pigment dispersion stability, hue variation etc., containing, as the essential ingredients, a specific light liquid isoparaffin, inorganic pigment and aliphatic carboxylic acid. CONSTITUTION:The objective cosmetic containing, as the essential ingredients, (A) 25-90wt.% of a 8-15C (most pref. 10-11C) light liquid isoparaffin, (B) 8-60wt.% of an inorganic pigment <=0.1mum in particle size (e.g. black iron oxide, brown iron oxide, red oxide, yellow iron oxide, chromium oxide) and (C) 2-40wt.% of a 12-22C aliphatic carboxylic acid.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an oil-based batting pen-type eyeliner cosmetic.

[Conventional technology]

An eyeliner container with a padded felt-tip pen structure is simpler and easier to draw thin lines than a conventional bottle-shaped eyeliner, and is a suitable container for eyeliner.

Conventionally, eyeliners with this type of felt-tip pen structure have been commercially available, but all of them use water-based cosmetics.

The water-based cosmetics used in conventional eyeliners have a viscosity within the allowable range (50 cps or less), and some contain pigments with a particle size of 0.1 μm or less to stabilize pigment dispersion. Since these are water-based cosmetics, they are generally inferior in water resistance, adhesion, and antiseptic properties.

The sliver fiber (hair-like fiber) pen core used in the structure of the filled felt-tip pen is originally made of preservatives.
If you try to solve this problem with water-based cosmetics, you will have to increase the amount of preservatives added, which may cause skin irritation and
Increased chance of sensitization.

In order to improve water resistance and adhesion, O/W (oil-in-water dispersion) emulsions or resin emulsions are added, or eyeliners other than batted types are used, but the former requires a viscosity of 50 cps or less. The latter is not suitable for batted eyeliners that use parts with a large surface area such as padding and pen cores.

Inorganic pigments are generally highly safe and are suitable coloring agents for eyeliners; most are metal oxides, and when they come into contact with water for a long period of time in aqueous cosmetics, they undergo oxidation-reduction. There is a problem that discoloration tends to occur due to changes in value.

[Problem to be solved by the invention]

An object of the present invention is to provide an oil-based filled pen-type eyeliner cosmetic that is superior in antiseptic properties, water resistance, skin irritation, and hue stability than conventional water-based filled pen-type eyeliners.

[Means to solve the problem]

As a result of intensive research to solve the above-mentioned problems, the inventor of the present invention solved the problem by using a light fluid isoparaffin as a solvent, an aliphatic carboxylic acid as a dispersant, and a fine particle inorganic pigment as a pigment. They discovered this and completed the present invention.

That is, the present invention uses a light liquid isoparaffin having 8 to 15 carbon atoms, an inorganic pigment with a particle size of 01 μm or less, and 12 to 22 carbon atoms.
This is an oil-based cotton-filled eyeliner cosmetic containing aliphatic carboxylic acid as an essential ingredient. Furthermore, preferably 25 to 90% by weight of light fluid isoparaffins having 8 to 15 carbon atoms and 8 to 60% by weight of inorganic pigments having a particle size of 0.1 μm or less.
, containing 2 to 40% by weight of aliphatic carboxylic acid having 12 to 22 carbon atoms.

The inorganic pigment is preferably at least one pigment selected from the group consisting of black iron oxide, brown iron oxide, red iron oxide, yellow iron oxide, chromium oxide, and chromium hydroxide and having a particle size of 0.1 μm or less.

Further, the viscosity of the eyeliner cosmetic is preferably 50 cps or less.

Next, the present invention will be explained in detail.

As the main solvent, a light fluid isoparaffin having 8 to 15 carbon atoms is used.

Light liquid isoparaffin is superior to liquid paraffin in terms of drying properties. If the number of carbon atoms is less than C8, it may be irritating, and if the number of carbon atoms is more than C10, drying properties are poor.

In particular, C5° to C1+ liquid isoparaffins are most preferred.

The blending amount is 25 to 90% by weight.

If it is less than 25% by weight, the viscosity will be higher than 50 cps, and if it is more than 90% by weight, the color will be too pale.

The pigment used is an inorganic pigment with a particle size of 0.1 μm or less.

Black iron oxide, brown iron oxide, red iron oxide, yellow iron oxide, chromium oxide, and chromium hydroxide are used alone or in mixtures.

The above black iron oxide is (1-n)FeO-n-Fe20. ,
Tea iron oxide is a type of ferrite represented by γ-Fe.
It is γ-hematite represented by 2O3.

If the particle size exceeds 0.1 μm, sedimentation and separation of a-hulls will occur in the batting and pen core, causing a change in hue during application.

The blending amount is 8 to 60% by weight.

If the amount is less than 8% by weight, the color will be too pale, and if it exceeds 60% by weight, the viscosity will be too high, at 50 cps or more.

As the dispersant, aliphatic carboxylic acids having 12 to 22 carbon atoms are used, including linear saturated aliphatic carboxylic acids such as lauric acid, stearic acid, and behelic acid, and branched saturated aliphatic carboxylic acids such as isostearic acid. , linoleic acid, linuric acid,
Unsaturated aliphatic carboxylic acids such as oleic acid and erucic acid are used. The linear saturated aliphatic carboxylic acid has a high melting point and is easily solidified (crystallized), so it is difficult to use it alone and it is recommended to use it in combination with other carboxylic acids.

If the number of carbon atoms is less than C12, it is irritating and has poor dispersibility.

If the number of carbon atoms is greater than C22, the viscosity after dispersion will be higher,
Also, it may cause kelization at low temperatures, which is not preferable.

The blending amount is 2 to 40% by weight.

If the blending amount is less than 2% by weight, sufficient effect as a pigment dispersant will not be seen, and if it exceeds 40% by weight, the effect as a dispersant will be saturated, and not only will it not be more effective, but it will also be economical. and the viscosity becomes high.

As other ingredients, additives such as antioxidants, viscosity modifiers, skin protectants, etc. can be optionally added as long as there are no problems with dispersion stability or viscosity.

The manufacturing method is to stir and dissolve aliphatic carboxylic acid (dispersant) in light liquid isoparaffin, add pigment to it,
A dispersion is obtained by stirring and dispersing using a dispersing machine such as a ball mill or a Sunl'' mill or a homomixer.

Another method is to dissolve an aliphatic carbonic acid salt as a dispersant in an alkaline aqueous solution, add a pigment, and stir.
Neutralization causes the pigment-adsorbed dispersant to aggregate. In order to disperse these aggregates, there is a method in which light liquid isoparaffin is added as a solvent to the aggregates, the mixture is stirred, the pigment adsorbed by the dispersant is transferred to the solvent layer, and then the separated aqueous layer is removed. One method is to wash it with water to remove excess carboxylic acids and salts, then dry and dehydrate it, and then add it to light liquid isoparaffin as a solvent. In either method, a small amount of water is removed by heating, reducing pressure, etc.

Particularly when using fine particle pigments treated in an aqueous solution, a dispersion can be easily obtained by continuously carrying out the above dehydration method. In either method, if coarse particles are contained, they must be removed by centrifugation to reduce the pigment particle size to 0.1 μm or less.

The purified dispersion obtained by these operations is concentrated and diluted to adjust the concentration as necessary, and then antioxidants, viscosity modifiers, etc. are added as necessary, and the eyeliner is prepared by stirring. Get the liquid.

[For production]

The eyeliner liquid of the present invention uses light liquid isoparaffin as a solvent, so it can be used without adding any preservatives.
Good antiseptic properties are obtained, and therefore there are no adverse effects such as irritation or sensitization due to the addition of preservatives.

Further, by using fatty acids as a dispersant, water resistance becomes good, and by setting the pigment particle size to 0.1 μm, good dispersion stability is obtained.

Since it is completely non-aqueous, there is little change in hue due to changes in pigment valence.

〔Example〕

EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to the same extent by these Examples.

(Example 1) Black iron oxide (Mitsubishi Metals Magnetite) 35
．． 0% by weight isostearic acid
35.0% by weight Light liquid isoparaffin (Nippon El Chemical, El Sol 71 L) Remaining 1 light liquid isoparaffin (Japan/L Chemical, L/-Lua) L) Remaining =
Isostearic acid was added to a total of 100% light liquid isoparaffin, and after thorough stirring and mixing, black iron oxide was added and stirred in a ball mill for one week to obtain an eyeliner stock solution. This was centrifuged to obtain an eyeliner liquid with a viscosity of 25 cps, 30% by weight of black iron oxide, and 20% by weight of isostearic acid. The average particle size of the pigment at this time was 0.067 μm.

(Example 2) Red iron (Daito Kasei No. 217)
40.0% by weight sodium oleate
300% by weight Total 100°0% by weight Sodium oleate was added to purified water and dissolved with stirring, followed by addition of red iron oxide and stirring for 2 hours using a homomixer.

Thereafter, a small amount of hydrochloric acid was added to adjust the pH to 5.5 to coagulate and precipitate the oleic acid adsorbed Red Red Red Garla, which was washed with water five times, and the aggregates were collected by vacuum filtration.

The solid content of this aggregate was 60% by weight, of which 33% by weight was red iron and 27% by weight was oleic acid.

Using this aggregate, an eyeliner liquid was obtained according to the following formulation.

Aggregate 70
Total weight%: 100% by weight First, light liquid isoparaffin is added to the aggregate, stirred lightly, heated at around 70°C to remove methanol, and then gradually heated at 110°C for 30 minutes to remove moisture. was removed. This was centrifuged to obtain an eyeliner liquid with a viscosity of 32 cps, 27% by weight of red iron oxide, and 22% by weight of oleic acid. The average particle size of the pigment at this time was 0.076 μm
Met.

(Comparative Example 1) 1. Black iron oxide 25
Weight% 2, isostearic acid
25% by weight 3 Polyoxygen/ethylene (degree of polymerization 20)
oleyl ether
2o wt%4, purified water
Total remaining amount: 100 weight Weight The above 2.3.4 was sufficiently stirred and mixed, 1 was added, and the mixture was stirred in a ball mill for one week and centrifuged to obtain an eyeliner aqueous stock solution.

5. Eyeliner aqueous stock solution 927
Weight% 6, 1. 3-butylene glycol
70% by weight.

7. Methyl paraoxybenzoate 02% by weight 8. Propyl paraoxybenzoate 0
1wt% total 100wt 9b After thoroughly stirring and mixing the above 6 and 7.8, add 5 and add 1
After stirring for an hour, an aqueous eyeliner solution was obtained.

The viscosity of this eyeliner liquid is 21 cps, black iron oxide 2
8% by weight, isostearic acid and polyoxyethylene (
20) Oleyl ether 34% by weight, average particle size 0.0
It was 61 μm.

(Comparative Example 2) A pigment aggregate was obtained in the same manner as in Example 2, and an eyeliner stock solution was obtained by the following formulation.

1. Aggregate 60
Weight% 2, polyoxyethylene/ethylene [20j oleyl ether lo
ffiEt%3 Purified water
After sufficiently stirring 30% by weight 2.3, 1 was added, and after stirring for 2 hours, an eyeliner stock solution was obtained by centrifugation.

Furthermore, an aqueous eyeliner liquid was obtained by the following formulation.

4 Eyeliner stock solution 92.
7% by weight 5, ], 3 butylene glycol
70% by weight 6, methyl paraoxybenzoate
02% by weight 7 Propyl roseoxybenzoate
0. ] Heavy JiR% 5.6.7 was thoroughly stirred,
After mixing, 4 was added and stirred for 1 hour to obtain an aqueous eyeliner liquid.

The viscosity of this eyeliner is 23 cps, red iron 25
% by weight, oleic acid and polyoxyethylene (20) oleyl ether 36% by weight, average particle size 0.081 μm
Met.

(2) Antiseptic efficacy test based on USPXXI'Ja using the eyeliner liquids produced in the above Examples and Comparative Examples.

■ Measurement of the number of bacteria at the pen tip after 2 weeks of use in a padded eyeliner container.

■ Water resistance (applied to the back of the hand and evaluated by the time it takes to exhibit water resistance).

■ Skin irritation (monitor test with 20 people, molecule is the number of people who felt irritation out of 20 people).

■ Hue change (hue change after being left undisturbed for one month in a 50°C environment).

We conducted an evaluation study on the following. Table 1 shows the results.

Table 1 [Effects of the Invention] The eyeliner liquid of the present invention has a viscosity of 50 cps or less and a pigment particle size of 0.1 um or less, which improves pigment dispersion stability and writability. It becomes a cosmetic suitable for liner containers.

In particular, pigment dispersion stability is ensured by combining light liquid isoparaffin, fatty acids, and inorganic pigments and by setting the pigment particle size to 0.1 μm or less.

By using light liquid isoparaffin as the main solvent and fatty acids as the dispersant, it has excellent preservative effect in pen containers, water resistance, and color change.In particular, since no preservatives are used, there is almost no skin irritation. It is an excellent eyeliner liquid with a pen-type filling.

Claims (4)

[Claims] (1) An oil-based batting pen-type eyeliner cosmetic containing as essential components a light liquid isoparaffin having 8 to 15 carbon atoms, an inorganic pigment with a particle size of 0.1 μm or less, and an aliphatic carboxylic acid having 12 to 22 carbon atoms. (2) The oil-based batting pen-type eyeliner cosmetic according to claim (1), which contains 25 to 90% by weight of light liquid isoparaffin, 8 to 60% by weight of inorganic pigment, and 2 to 40% by weight of aliphatic carboxylic acid. (3) The inorganic pigment according to claim (1) or (2), wherein the inorganic pigment is at least one selected from the group consisting of black iron oxide, brown iron oxide, red iron oxide, yellow iron oxide, chromium oxide, and chromium hydroxide. Oil-based pen-type eyeliner cosmetic. (4) Claims (1) and (2) that the viscosity is 50 cps or less.
), the oil-based batting pen-type eyeliner cosmetic according to any one of (3).