JP2005263702A - Cosmetic for sticking to keratin fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cosmetic for sticking to keratin fibers simply imparting beautiful curls to the keratin fibers. <P>SOLUTION: The cosmetic for sticking to the keratin fibers comprises a polymer (A) having ≥13% ΔW represented by formula (I) ΔW=W2-W1 äwherein, W1 and W2 are each a value calculated by formulas W1(%)=[Wp/W1t]×100 and W2(%)=[Wp/W2t]×100 (wherein, Wp is the polymer weight in a coated film during coating; W1t is the coated film weight when the pencil hardness is 2B; and W2t is the coated film weight after the passage of 24 hr from coating)} and water. The content of the polymer (A) is 3-50 wt.%. A method for curling the keratin fibers comprises distributing the cosmetic unevenly on one surface of the keratin fibers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a keratin fiber-attaching cosmetic that can easily give beautiful curls to keratin fibers, particularly eyelashes, and a method for curling keratin fibers.

  The cosmetic for adhering keratin fibers has a cosmetic effect that curls the eyelashes and makes the eyelashes look thicker and longer in order to make the eyes clear and more attractive. With regard to curling in particular, the curling effect is an important performance that is highly demanded since the consumer can recognize the makeup effect (making eyelashes appear long and thick) only after curling the eyelashes. Actually, many people use a buller or the like to give the eyelashes a better curl. However, this is not only technical but also time consuming and laboring the user. At the same time, the eyelashes were damaged or pulled out.

In patent document 1, the mascara which expresses a curl effect is provided by the combination of adhesive polymer and a specific solid particle. Patent Document 2 provides a mascara that exhibits a curl effect by a combination of a film-forming polymer that causes shrinkage exceeding 1% of the stratum corneum and a wax. However, these mascaras require an auxiliary device such as a buller, and a sufficient curling effect cannot be obtained with only mascara.
JP 2003-55136 A Japanese Patent No. 29898929

  An object of the present invention is to provide a cosmetic material for adhering keratin fibers, which can easily give beautiful curls to keratin fibers, particularly eyelashes.

  The present invention contains a polymer (hereinafter referred to as polymer (A)) having a polymer occupancy change rate (ΔW) defined below of 13% or more and water, and the content of polymer (A) is 3 to 50 wt. %, And a method for curling keratin fibers in which the cosmetic material for attaching keratin fibers is unevenly distributed on one side of the keratin fibers.

<Polymer occupancy change rate (ΔW)>
ΔW is the rate of change of the polymer occupancy from the film hardness of pencil hardness 2B to drying in the process of forming the polymer film, and is a value represented by the formula (I).

ΔW = W2−W1 (I)
Here, W1 and W2 were prepared by preparing an aqueous solution with a polymer concentration of 20% by weight, and applying it to an area of 11 cm × 20 cm with a thickness of 250 μm on each of two glass plates by using an applicator, 23 ° C., 65% RH Measure the change in weight of the coating film as it dries on one polymer-developed glass plate, measure the film hardness with the pencil hardness method, and the polymer film hardness is 2B pencil hardness. The polymer occupancy is calculated by the following formula to be W1 (%), and the polymer occupancy after 24 hours after coating (hereinafter referred to as after drying) is calculated by the following formula to be W2 (%).

W1 (%) = [Wp / W1t] × 100
W2 (%) = [Wp / W2t] × 100
(Wp is the weight of the polymer in the coating film at the time of application, W1t is the weight of the coating film when the pencil hardness is 2B, and W2t is the weight of the coating film after drying.)

  The cosmetic for adhering keratin fibers of the present invention can obtain a sufficiently high curling effect without using an instrument such as a buller. This phenomenon is thought to be due to the volumetric shrinkage of the coating that accompanies drying when a polymer (A) solution or emulsion is formed.

[Polymer (A)]
In the present invention, the polymer (A) can be used regardless of the composition and form of the polymer as long as the polymer occupancy change rate (ΔW) defined above is 13% or more. 35% polymer is preferred and 15-30% polymer is more preferred.

  Examples of the polymer (A) include acrylic polymers such as polymethacrylic acid or a salt thereof, styrene polymers such as polystyrene sulfonic acid or a salt thereof, and urethanes such as polyurethane, acrylic-polyurethane, polyester-polyurethane, and polyether-polyurethane. Based polymers and the like. Among these polymers, in terms of safety and polymer hardness, at least one constituent monomer unit selected from a polymer having at least one constituent monomer unit selected from methacrylic acid and a salt thereof, and styrene sulfonic acid and a salt thereof. A polymer having at least one constituent monomer unit selected from methacrylic acid and a salt thereof is more preferable. Examples of the salt include alkali metal salts, alkaline earth metal salts, ammonium salts and the like.

  The weight average molecular weight (measured by GPC, converted to polyethylene glycol) of the polymer (A) is preferably 5,000 to 1,000,000, and more preferably 8,000 to 500,000. The polymer (A) can be used regardless of the form, such as an aqueous solution system, a water / alcohol mixed solution system, or an emulsion system.

[Cosmetics for attaching keratin fibers]
The cosmetic for adhering keratin fibers of the present invention contains a polymer (A) and water. The content of the polymer (A) in the cosmetic of the present invention is 3% by weight or more from the viewpoint of giving good curl, 50% by weight or less from the viewpoint of easy use in terms of viscosity, and 3.5 to 50 % By weight is preferred, and 3.5 to 40% by weight is more preferred. Moreover, 20 to 95 weight% is preferable, as for content of the water in the cosmetics of this invention, 30 to 90 weight% is still more preferable, and 40 to 80 weight% is especially preferable.

  In the cosmetic of the present invention, a monohydric or polyhydric alcohol can be blended in order to improve adhesion to keratin fibers. Examples of monohydric alcohols include ethanol, isopropanol, and butyl alcohol. Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, glycerin, diglycerin, polyglycerin, 1 1,3-butylene glycol and the like, and ethanol and 1,3-butylene glycol are preferable. The amount of monohydric or polyhydric alcohol in the cosmetic of the present invention is preferably 1% by weight or more from the viewpoint of improving adhesion to keratin fibers, and preferably 12% by weight or less from the viewpoint of not impairing the curl-up effect. 2 to 10% by weight is more preferable.

  In the cosmetic for adhering keratin fibers of the present invention, a film-forming polymer other than the polymer (A) can be blended within a range that does not impair the object of the present invention. Examples of the film-forming polymer include homopolymers and copolymers of alkyl esters of acrylic acid and methacrylic acid, alkyl acrylate / styrene copolymers, polyvinyl acetate, polyvinyl alcohol, and silicone polymers. These polymers can be used regardless of the form such as a solution system or an emulsion system. In particular, it is preferable to blend a polymer emulsion in order to impart moisture resistance to the cosmetic.

  A thickener can be added to the cosmetic for adhering keratin fibers of the present invention. By adding a thickener, adhesion to eyelashes can be further improved. As used herein, the thickener can be dissolved in an aqueous component to impart viscosity, and any thickener can be used as long as it can be used in cosmetics. For example, natural products such as guar gum, gum arabic, sodium alginate, carrageenan, xanthan gum, modified corn starch, starch and the like; semisynthetic materials such as methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, cationized hydroxyethyl cellulose; Examples thereof include synthetic polymers such as vinyl polymers, acrylic polymers such as sodium polyacrylate, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol, vinyl pyrrolidone / vinyl alcohol copolymers, and polymethyl vinyl ether. 0.01-20 weight% is preferable and the compounding quantity of the thickener in the cosmetics of this invention has more preferable 0.5-10 weight%.

  In addition to the above-described components, the cosmetic composition for adhering keratin fibers according to the present invention can be blended with a component for imparting a cosmetic effect in a range that does not detract from the effects of the present invention. Examples of such components include ester-based and hydrocarbon-based oil agents; surfactants such as anionic surfactants, cationic surfactants, and nonionic surfactants; and powders such as extender pigments, white pigments, and organic pigments. Pigments, organic powders, pearl agents, organic dyes, and the like can be used. Specific examples of powders include talc, mica, kaolin, calcium carbonate, magnesium carbonate, titanium oxide, zinc white, bengara, yellow iron oxide, black iron oxide, nylon powder, silk powder, silicone powder, mica titanium, tar pigment Etc. These are not particularly limited, and one type or two or more types can be used as necessary.

In addition, the cosmetic of the present invention can contain fibers in order to enhance the long lash effect. As the fiber, any of natural fibers such as cotton, silk and hemp, regenerated fibers such as rayon, and synthetic fibers such as polyamide, polyester, acrylic resin, and polyolefin may be used. Fiber is preferred. Furthermore, you may use the fiber which surface-treated as needed. For example, those subjected to surface treatment such as silica treatment, silicone treatment, fluorine compound treatment, metal soap treatment, oil treatment can be used.
In addition, other ingredients such as fragrances and preservatives that are usually blended in cosmetics can be blended.

The cosmetic for adhering keratin fibers of the present invention is provided in the form of a solution system using a solvent that dissolves the polymer (A), a W / O or O / W emulsion system, and the like.
Moreover, the cosmetic composition for adhering keratin fibers of the present invention can be used not only as a compound containing a coloring pigment but also as a so-called base material for eyelashes.

[Keratin fiber curling method]
By making the keratin fiber adhering cosmetic of the present invention unevenly distributed on one side of the keratin fiber, keratin fibers such as eyelashes can be curled without using a buller or the like. Here, “unevenly distributed” means to attach more keratin fiber adhering cosmetic material to one side of the keratin fiber. Thereby, a keratin fiber can be curled to the side where much cosmetics of the present invention which have contractibility have adhered.

  In the present invention, the degree of curling of keratin fibers is preferably in the range of 30 to 180 degrees, more preferably in the range of 45 to 180 degrees, and particularly preferably in the range of 55 to 150 degrees. .

<Measuring method of bending angle of film>
0.04g of keratin fiber adhesion cosmetics in the form of a 4mm wide band in the center of a 2x5cm PET film (made by Teijin DuPont Co., Ltd., Mechinex S, film thickness 75μm) fixed on one side with a tape on a slide glass It is applied, dried under the conditions of 23 ° C. and 60% RH, and the curvature angle of the film after 3 hours is measured. The angle was measured with a protractor, three points were measured per sample, and the average value was taken as the bending angle.

  The cosmetic composition for adhering keratin fibers of the present invention contains the polymer (A) having a polymer occupation rate change rate (ΔW) of 13% or more as defined above in the specific range, so that the polymer (A) is simply In addition to acting as a thickener or film-forming agent, the keratin fibers can be contracted to give good curling properties.

  Patent Document 2 discloses a mascara that exhibits a curl effect by a combination of a film-forming polymer that causes shrinkage exceeding 1% of the stratum corneum and a wax. However, in the mascara described in Patent Document 2, In the method for measuring the bending angle of the film, the film cannot be bent (the bending angle is 0 degree). The cosmetic composition for adhering keratin fibers according to the present invention can impart to the keratin fibers a shrinkage that is far superior to the level of minute shrinkage of 1% of the stratum corneum, and can obtain a good curl-up effect. It can be done.

Production Example 1
A glass reaction vessel is charged with 300 g of methacrylic acid (manufactured by Wako Pure Chemical Industries, Ltd.), 1.5 L of ethanol, and 1.73 g of a polymerization initiator V-65 (manufactured by Wako Pure Chemical Industries, Ltd.), and polymerized at 65 ° C. for 4 hours. did. The obtained polymer solution was dropped into 20 L of acetone for reprecipitation. The precipitate was collected, dried under reduced pressure at 65 ° C. for 12 hours or more, and adjusted to pH 6 with sulfuric acid to obtain polymethacrylic acid (hereinafter referred to as PMAA). The resulting PMAA had a weight average molecular weight (measured by GPC, converted to polyethylene glycol) of 180,000.

Examples 1-5 and Comparative Examples 1-2
Cosmetics having the composition shown in Table 1 were prepared using the polymers shown in Table 1 (ΔW of the polymer was measured by the above method). About the obtained cosmetics, the viscosity was measured under the conditions of 23 ° C. and 6 r / min using a B-type viscometer, and the bending angle of the film was measured by the above method. Moreover, sensory evaluation was performed by the following method about the makeup effect (curl-up effect) that makes the eye noticeable when the cosmetic is used as a mascara base, and the adhesion to eyelashes. These results are shown in Table 1.

<Curl-up effect evaluation method>
A certain number of human hairs having a length of about 1 to 1.5 cm are taken and fixed horizontally. Cosmetics were applied 10 times to the human hair, and the warp angle of the human hair from the horizontal plane was measured and evaluated according to the following criteria.
◎: 20 degrees or more ○: 15 degrees or more to less than 20 degrees Δ: 10 degrees or more to less than 15 degrees X: less than 10 degrees <Adhesion evaluation method>
As with the curl-up effect evaluation method, human hair coated with cosmetics was visually observed by a specialized panelist and evaluated according to the following criteria.
◎: Very uniform adhesion ○: Uniform adhesion △: Slightly uneven ×: Uneven

* 1: Polymethacrylic acid obtained in Production Example 1
* 2: Sodium polystyrene sulfonate (PS-35, manufactured by Tosoh Corporation) adjusted to pH 7 with sulfuric acid.
* 3: Polyvinylpyrrolidone (Wako Pure Chemical Industries, Ltd., Polyvinylpyrrolidone K90 Mw = about 360,000)
* 4: Hydroxyethyl cellulose (manufactured by Union Carbide, QP-100)
Example 6 and Comparative Example 3
Mascara was prepared by heating each component shown in Table 2 to the melting point of the wax and then stirring and mixing uniformly. The performance of each mascara was evaluated in the same manner as in Example 1. The results are shown in Table 2.

Claims (5)

The polymer occupancy rate of change (ΔW) defined below is 13% or more (hereinafter referred to as polymer (A)) and water, and the content of polymer (A) is 3 to 50% by weight. Cosmetic for adhering keratin fibers.
<Polymer occupancy change rate (ΔW)>
ΔW is the rate of change of the polymer occupancy from the film hardness of pencil hardness 2B to drying in the process of forming the polymer film, and is a value represented by the formula (I).
ΔW = W2−W1 (I)
Here, W1 and W2 were prepared by preparing an aqueous solution with a polymer concentration of 20% by weight, and applying it to an area of 11 cm × 20 cm with a thickness of 250 μm on each of two glass plates by using an applicator, 23 ° C., 65% RH Measure the change in weight of the coating film as it dries on one polymer-developed glass plate, measure the film hardness with the pencil hardness method, and the polymer film hardness is 2B pencil hardness. The polymer occupancy is calculated by the following formula to be W1 (%), and the polymer occupancy after 24 hours after coating (hereinafter referred to as after drying) is calculated by the following formula to be W2 (%).
W1 (%) = [Wp / W1t] × 100
W2 (%) = [Wp / W2t] × 100
(Wp is the weight of the polymer in the coating film at the time of application, W1t is the weight of the coating film when the pencil hardness is 2B, and W2t is the weight of the coating film after drying.)   The cosmetic for adhering keratin fibers according to claim 1, wherein the polymer (A) has at least one constituent monomer unit selected from methacrylic acid and salts thereof.   The cosmetic for adhering keratin fibers according to claim 1, wherein the polymer (A) has at least one constituent monomer unit selected from styrenesulfonic acid and salts thereof.   The keratin fiber adhesion cosmetic according to any one of claims 1 to 3, wherein the keratin fiber is eyelash. A curling method for keratin fibers, wherein the cosmetic material for adhering keratin fibers according to any one of claims 1 to 4 is unevenly distributed on one side of the keratin fibers.