JP2791093B2 - Solid cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a solid cosmetic having excellent transparency and excellent storage stability and organoleptic properties (adhesiveness, extensibility, and sustainability).

[Problems to be solved by conventional technology and invention]

Conventionally, transparent cosmetics are widely known in the form of pastes or liquids. Solid products include those containing resins (polymeric substances) such as polyamide resins and ester gums as solidifying agents. There were only a few.
(See JP-B-45-41318, JP-B-52-7067, and JP-A-63-119405). However, these cosmetics are not always satisfactory in terms of transparency, storage stability, and organoleptic properties, particularly transparency.

Therefore, there has been a long-awaited need for a solid cosmetic having excellent storage stability and organoleptic properties and improved transparency.

An object of the present invention is to provide a solid cosmetic having excellent transparency, storage stability, and organoleptic properties.

[Means for solving the problem]

The present invention is a solid cosmetic comprising 12-hydroxystearic acid, heavy liquid isoparaffin, and a liquid oil component.

12-Hydroxystearic acid used in the present invention is a fatty acid obtained by catalytic reduction of ricinoleic acid contained in castor oil by 80 to 85% with hydrogen gas, and is a white hard and brittle waxy solid. And commercial products can be used. 12-Hydroxystearic acid is a solidifying agent for transparent solid cosmetics, and its gel has low stickiness (stickiness), good extensibility, excellent adhesion to skin, etc., and changes in hardness over a wide temperature range. And the transparency is good. The compounding amount is preferably 3.0 to 10.0% by weight (hereinafter abbreviated as wt%). If the compounding amount is less than 3% by weight, it is difficult to solidify, and if it is more than 10% by weight, the transparency is reduced.

The heavy liquid isoparaffin used in the present invention is different from ordinary liquid paraffin and is a mixture of hydrocarbons having a side chain obtained by copolymerizing isobutene and n-butene. The polymerization degree is preferably n = 10 to 46. Heavy liquid isoparaffin is a clarifying agent, and its compounding amount is 2
The content is preferably 0.0 to 60.0% by weight, and if the amount is out of this range, strength, sensory characteristics, and transparency are unfavorably poor.

As the liquid oily component used in the present invention, at least one selected from liquid oily components usually added to cosmetics is applied. For example, olive oil, jojoba oil, squalane, liquid paraffin, octyldodecyl ricinoleate, myristin Silicon oils such as octyldodecyl acid, diisostearyl malate, methylphenylpolysiloxane and the like can be mentioned. The compounding amount is 30.0 ~ 70.0wt
% Is preferable, and when the amount is outside this range, strength, sensory characteristics, transparency, and storage stability are inferior.

In addition to the above-mentioned components, the solid cosmetic of the present invention can appropriately contain a solid paraffin wax, a coloring pigment, a coloring matter, an antioxidant, a preservative, a fragrance, and the like as long as the object of the present invention is achieved. .

The form of the solid cosmetic of the present invention can be widely used as various cosmetic bases without any particular limitation as long as it is solid, and examples thereof include lipstick, lip balm, hair stick, sun stick, and condensate.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. The methods for evaluating the transparency, storage stability, and sensory characteristics are as described below.

(Transparency test) A sample was poured into a glass cell with an optical path length of 10 mm and an optical path width of 10 mm, and was cooled and solidified.
mm), the average of the transmittances was calculated based on the chart area, and evaluated according to the following criteria.

Evaluation symbol Transmittance 70% or more ◎ 〃 50% or more and less than 70% ○ 〃 30% or more and less than 50% △ 未 満 Less than 30% × (Storage stability test) The same sample is stored in a thermostat at 5 ℃ and 45 ℃ for 3 months After storage for a while, the changes in odor, appearance (color), and oil bleeding over time were compared.

Odor evaluation symbol Exactly the same ◎ Very slight rancidity ○ Slightly rancidity △ Strong rancidity × Appearance (color) Evaluation symbol Exactly the same ◎ Very slightly colored ○ Slightly colored △ Strongly colored × Oil Bleeding evaluation symbol Exactly the same ◎ Very slightly bleeding of oil ○ Slightly bleeding of oil △ Strongly bleeding of oil × Judgment result is smell, color, and bleeding of oil at 45 ° C when compared with stored at 5 ° C Are indicated by ◎, △, Δ, and × according to the above criteria.

(Sensory Characteristic Test) Samples of Comparative Example and Example were alternately applied to 20 female subjects.
Apply to the lips each time, immediately afterwards "adhesiveness""extensibility"
The subject of the evaluation of "sustainability" was evaluated by the paired comparison method. The evaluation results are shown in terms of the number of those who answered that the examples were better than the comparative examples for each of the above evaluation items.

Examples 1 to 8 and Comparative Examples 1 and 2 Lip lip balms and lipsticks of Examples and Comparative Examples were prepared according to the following formulations, and the above-mentioned tests were carried out. The results are shown in Table 1.

(Preparation method) Examples 1 to 8, Comparative Example 1 All components of the formulation were uniformly dissolved at 90 ° C, and after defoaming, 80 to 85 ° C
The mixture was poured into a resin mold and cooled and molded to obtain a lip balm.

Comparative Example 2 Components (1), (2), and (8) were heated and dissolved at 110 ° C., then cooled to 60 ° C., and components (3) to (7) were added thereto, uniformly dissolved, and defoamed. Thereafter, the mixture was poured into a resin mold at 60 ° C. and cooled and molded to obtain a lipstick.

(Characteristics) The results of various tests are shown in Table 1.

As is clear from Table 1, the lip balms of Examples 1 to 8 showed excellent results in various tests.

On the other hand, Comparative Example 1 lacking the heavy liquid isoparaffin, which is an essential component of the present invention, and Comparative Example 2 prepared by the formulation described in Examples of JP-A-63-119405 have both transparency and storage stability. The examples of the present invention were also poor in sensory characteristics.

[Effects of the Invention] As described above, it is apparent that the present invention provides a solid cosmetic having excellent transparency, storage stability and organoleptic properties.

Claims (1)

(57) [Claims] 1. A solid cosmetic comprising 12-hydroxystearic acid, heavy liquid isoparaffin, and a liquid oil component.