EP2687120A1 - Cold effect applicator tip - Google Patents

Abstract

The tip (1) is made of plastic material including organic loads, metal loads or a mixture of organic and metal loads, where the organic loads are made of graphite, carbon fiber or a mixture of graphite and carbon fiber. The plastic material contains preferably 40 wt.% organic loads. The plastic material comprises a plastic base in polyetheretherketone, polysulfide of phenylene, polyphtalamide, polyamide, polyimide, polyoxymethylene, polyimide-amidates or elastomers. An independent claim is also included for a container.

Description

Technical area

The invention relates to the field of applicator tips for cosmetic products and more particularly the field of applicator tips with a cold effect for cosmetic products.

State of the art

There are applicator tips for giving a cold effect to the user when it puts the applicator tip in contact with his skin.

For example, the document US 2003/0100936 describes an applicator tip for imparting a cold effect to the user. This applicator tip comprises a hollow roller intended to be placed in contact with the skin of the user. This hollow roll can be metal, ceramic, plastic, quartz sapphire. This hollow roll also comprises a reservoir filled with a freeze liquid. Before use, this roller must be placed in a cold enough place to allow the liquid to freeze, for example in a freezer. In use, the frozen liquid constitutes a heat sink, the wall of the roll then forming an interface between the skin and the frozen liquid. The frozen liquid, through the wall of the roll, cools the skin.

Thus, with this applicator, the use of a freezing means is necessary. Therefore, the use of this applicator tip is energy consuming.

There are, moreover, applicator tips that do not require, prior to their use, cooling by means of a cooling means such as for example a freezer.

An example of an applicator tip of this type is described in the document US7883287 . This applicator tip comprises a ceramic or metal thermal storage body for applying the cosmetic product contained in a reservoir. The storage body has a volume of between 300 and 700 mm ³ , and its mass can be between 0.3 and 0.7 g. The surface of the applicator tip is polished. The cold effect of the applicator tip is obtained by the simple contact between the thermal storage body and the skin of the user.

However, the use of metal is not recommended, especially when the metal must come into contact with the applied cosmetic product. Indeed, the metal can induce oxidation of the cosmetic product, thus deteriorating its properties.

• le mélange de poudre de céramique avec un liant en polymère thermoplastique jusqu'à l'obtention d'un mélange homogène ;
• le chauffage du mélange homogène ;
• l'extrusion sous forme de granules du mélange homogène ;
• le chauffage des granules pour fondre le liant ;
• l'injection du mélange homogène constitué de poudre de céramique et de liant fondu dans un moule pour obtenir une pièce crue ;
• le chauffage de la pièce crue à environ 400°C pour enlever le liant pour obtenir une pièce cuite ;
• le chauffage de la pièce cuite à 85% de la température de fusion de la céramique pour le frittage, permettant la densification et la réduction de la poudre de céramique en un solide dense avec l'élimination des pores.

In addition, ceramic is a relatively expensive material. For example, a ceramic usually used to impart a cold effect is based on alumina at 96% by weight. The work of ceramics is relatively complex. Indeed, it requires the following steps:

• mixing the ceramic powder with a binder of thermoplastic polymer until a homogeneous mixture is obtained;
• heating the homogeneous mixture;
• granular extrusion of the homogeneous mixture;
• heating the granules to melt the binder;
• injecting the homogeneous mixture of ceramic powder and molten binder into a mold to obtain a green part;
• heating the green part at about 400 ° C to remove the binder to obtain a fired piece;
• heating the fired piece to 85% of the melting temperature of the ceramic for sintering, allowing the densification and reduction of the ceramic powder to a dense solid with the removal of pores.

Also, this ceramic also requires an assembly step with the use of a hoop to trap the ceramic against the container in which the cosmetic product is contained.

Presentation

An object of the present application is to overcome at least one of the disadvantages of the prior art.

In particular, an objective of the present application is to propose a cold-applied applicator tip whose use is electrically economical and inexpensive manufacturing, while limiting the risk of oxidation of the cosmetic product to be applied.

For this, a cold-applied applicator tip for cosmetic products, characterized in that the applicator tip is made of a plastic material comprising organic fillers, metal fillers or a mixture of the two.

Thus, thanks to such an applicator tip, it is possible to confer a cold effect, while avoiding the use of a solid metal applicator that can oxidize the cosmetic product and reducing the cost of manufacturing the applicator tip compared ceramic applicator tips. It is also possible thanks to the use of a plastic material responsible for obtaining applicator tips having various forms related to the assembly functions.

Indeed, the number of assembly possibilities to a tank, such as a tube, is greater for applicator tips of plastic material loaded to that relating to an applicator tip of ceramic material. Indeed, as the manufacture of the applicator tip of plastic material loaded with metal and / or organic is a standard injection process, it is possible to consider different solutions for assembly on a tank such as a tube. For example, it is possible to inject the applicator tip directly onto the skirt of the tube. It is also possible to overmold the applicator tip on a polyolefin insert for standard clipping on a tube head. Another example, it is possible to inject the applicator tip with an internal thread, the applicator is then screwed onto the tube head. Yet another example, it is possible to inject the applicator tip with forms that allow it to be clipped into a tube head.

It is also proposed a container for products with applicator tip cold effect, comprising a reservoir for containing a cosmetic product and an applicator tip as described above.

Presentation of drawings

• la figure 1 est une vue de face d'un embout applicateur à effet froid ; et
• la figure 2 est une coupe longitudinale de l'embout applicateur de la figure 1.

Other objectives, characteristics and advantages will appear on reading the detailed description which follows, with reference to the drawings given for illustrative and non-limiting purposes, among which:

• the figure 1 is a front view of a cold-applied applicator tip; and
• the figure 2 is a longitudinal section of the applicator tip of the figure 1 .

detailed description

With reference to Figures 1 and 2 a cold-applied applicator tip for cosmetics is described below.

This applicator tip is made of a plastic material comprising organic fillers, metal fillers or a mixture of both, said organic or metal filled plastic material.

The term "filled plastics material" is understood to mean, in the present application, a plastic base constituting a continuous plastic solid phase in which charge particles have been dispersed. The plastic base may be polyetheretherketone (PEEK), phenylene polysulfide (PPS), polyphthalamide (PPA), or polyamide (PA). The plastic base may also be polyimide (PI), polyoxymethylene (POM), polyimide-amide (PAI), copolyesters, polypropylene or elastomers.

The materials mentioned above which can constitute the plastic base, are common materials and less expensive than ceramics. Moreover, the use of a plastic base allows the simple manufacture of the applicator tip, for example by injection. In addition, it is possible to give the applicator tip various shapes related to assembly functions that can not be obtained in ceramic material.

The fillers included in the plastic base are dispersed metal and / or organic solid particles. If the plastic material is metal-filled, it may comprise solid particles of metal element or metal salt. The solid particles in metal element are for example in aluminum, bronze, chrome, copper, and their alloys. The solid particles of metal salt are for example alkaline earth salts of magnesium, beryllium, calcium, strontium, barium, radium and metal salts of iron, aluminum, copper, chromium. If the plastic material is organic-loaded, it may comprise organic solid particles of graphite, carbon fiber, or a mixture of both. If the plastic material is loaded both metallic and organic, it comprises both types of solid particles described above.

Preferably, the metal and / or organic fillers represent at least about 20% by weight of the plastic material, more preferably at least about 30% by weight, still preferably at least about 40% by weight, especially preferably less than about 70% by weight.

Examples of metal-filled plastics material are filled polyamide, in particular about 45% by weight of inorganic salts, polyphthalamide loaded to about 40% by weight of carbon, graphite and alumina powder, phenylene polysulfide loaded at about 40% by weight. % by weight of inorganic salts of magnesium and iron or polyetheretherketone loaded to about 40% by weight of graphite and carbon fibers, or copolyester loaded or polypropylene loaded.

For example, the polyamide may be charged from about 10% to about 30% of Graphite, from about 1% to about 5% Titanium dioxide, and / or from about 0.1% to 1% quartz Silica.

All these materials listed above allow to obtain a cold effect. The cold effect can be described as a disruption of the equilibrium state in which the user's skin of the applicator tip is located before contacting the applicator tip with the skin.

Indeed, the skin has the ability in contact with air at a given temperature to maintain a temperature close to its initial temperature, about 35 ° C.

A cold-applied applicator tip, when in contact with the skin, breaks this balance, which provides the cold effect. The cold effect disappears as the applicator tip heats up on contact with the skin. The The slowness with which the applicator tip heats up to reach a new thermal stability is called thermal inertia.

• la diffusivité thermique qui caractérise la capacité du matériau de l'embout applicateur à déplacer des calories à travers sa masse;
• l'épaisseur du matériau constitutif de l'embout applicateur ; et
• l'effusivité thermique du matériau constitutif de l'embout applicateur qui caractérise la rapidité du matériau à absorber des calories de l'extérieur.

The thermal inertia of the applicator tip can be quantified by:

• the thermal diffusivity which characterizes the capacity of the applicator tip material to move calories through its mass;
• the thickness of the constituent material of the applicator tip; and
• the thermal effusivity of the constituent material of the applicator tip which characterizes the speed of the material to absorb calories from the outside.

The thermal diffusivity and the thickness of the material determine the time that this material will have to reach a new thermal stability.

• la conductivité thermique λ qui quantifie l'aptitude du matériau à conduire de la chaleur et est étroitement liée à la conductivité électrique car, du point de vue atomique, elle est fonction du mouvement des porteurs de charges (électrons) et de l'oscillation des atomes sur eux-mêmes ;
• la masse volumique ρ ; et
• la capacité thermique massique c qui exprime la quantité d'énergie thermique nécessaire pour augmenter la température d'un corps d'un degré ;

par les formules suivantes : $$E=\sqrt{\mathrm{\lambda \rho }c}\mathrm{et}D=\frac{\mathrm{\lambda }}{\mathrm{\rho }\mathit{c}}\mathrm{.}$$

The diffusivity D and the effusivity E are related to the following three characteristics:

• the thermal conductivity λ which quantifies the ability of the material to conduct heat and is closely related to the electrical conductivity because, from the atomic point of view, it is a function of the movement of the charge carriers (electrons) and the oscillation of the atoms on themselves;
• the density ρ; and
• the specific heat capacity c which expresses the amount of heat energy needed to increase the temperature of a body by one degree;

by the following formulas: $$E=\sqrt{\mathrm{\lambda \rho }\mathrm{vs}}\mathrm{and}D=\frac{\mathrm{\lambda }}{\mathrm{\rho }\mathit{vs}}\mathrm{.}$$

From the thermal effusivity E _material of the material constituting the applicator tip and thermal _skin E skin effusivity, it is possible to determine the T _contact contact temperature according to the following formula: $$T_{\mathit{contact}}=\frac{E_{\mathit{material}}\times T_{\mathit{material}}+E_{\mathit{skin}}\times T_{\mathit{skin}}}{T_{\mathit{material}}+E_{\mathit{skin}}}\mathrm{.}$$

The plastic material preferably has an effusivity greater than or equal to about 4000 JK ^-1 .m ^-2 .s ^-1/2 , more preferably greater than or equal to about 4700 JK ^-1 .m ^-2 .s ^-1/2 , still preferably greater than or equal to about 7100 JK ^-1 .m ^-2 .s ^-1/2 , especially preferably greater than or equal to about 7300 JK ^-1 .m ^-2 .s ^-1/2 .

At the same time, the plastic material preferably has a diffusivity of greater than about 6 m ² / s, more preferably greater than or equal to about 7.8 m ² / s, still preferably greater than or equal to about 12 m ² / s .

A high effusivity combined with a high diffusivity allows the heat to be rapidly removed from the skin, through the plastic material of the applicator tip towards the colder ambient air.

The plastic material preferably has a density greater than about 1.4 g / cm ³ , more preferably greater than or equal to about 1.6 g / cm ³ , still preferably less than or equal to about 2 g / cm ³ .

The plastic material preferably has a thermal conductivity greater than or equal to about 10 W / (m.K). Methods for the measurement of thermal conductivity are known, an example is given in ISO / CD22007.

The plastic material preferably provides a cold effect for at least about 10 seconds, still preferably greater than about 15 seconds, more preferably between about 15 seconds and about 20 seconds.

The applicator tip may also have a lacquered application surface with or without tint, metallized or galvanized.

A lacquered or metallized application surface makes it possible to improve the aesthetic appearance of the applicator tip. Indeed, the charges added to the plastic base are generally dark or even black colors. The coating and metallization of the application surface does not affect the properties of the underlying metallic or organic plastic material.

The lacquering can be carried out by the application of a standard varnish as usually used.

The metal used for the metallization of the application surface may be a pure metal or an alloy. Metals include aluminum, silver, nickel, chromium, copper, titanium and gold. Among the alloys, mention may be made of stainless steel and aluminum / copper alloys. The metal layer formed during metallization on the application surface is then varnished to protect it.

Galvanization can be carried out from a target made of aluminum, copper, chrome, nickel, silver or gold.

These applicator tips whose application surface is metallized or galvanized do not have the same disadvantages as applicator tips entirely made of metal. Indeed, unlike these, the cosmetic product is in contact with the metal at the time of application. Moreover, the application surface can be cleaned. Thus, there is no risk of oxidation of the cosmetic product to be applied.

The applicator tip 1 comprises an outer application surface 12 and intended to be brought into contact with the skin. This application surface 12 may extend along an inclined plane P relative to the axis A of the applicator tip 1. For example, the applicator tip 1 comprises an annular wall 13 configured in a cylindrical tube, preferably of circular cross section, which is bevelled at one of its ends along the inclined plane P. The application surface 12 may also be slightly convex and having a radius of curvature of between about 20 mm and 50 mm, by for example about 25 mm or about 45 mm.

The acute angle of the bevel, that is to say the angle between the axis A and the inclined plane P, may be between about 15 ° and about 70 °, preferably between about 30 ° and 65 °, still preferably about 45 °.

The thickness of the metallic and / or organic charged plastic material under the application surface 12 is from about 1.5 mm to about 5.5 mm, preferably from about 2 mm to about 5 mm. The thickness is normally measured at the application surface 12.

At the other end of the non-bevelled tube, the edges 14 of the annular wall 13 are tapered so as to facilitate the insertion of the applicator tip 1 in a tube head by this other end.

A circumferential stop 15, preferably circular, is provided around the annular wall 13 and extends therefrom. The applicator tip 1 may also have an orifice 16 passing through and opening into a reservoir of a cosmetic product tube. Thus the cosmetic product can be directly distributed on the application surface 12 through the orifice 16.

The thickness of the annular wall 13 is between about 1.5 mm and about 5.5 mm, preferably between about 2 mm and about 5 mm. When the cylindrical tube in which the annular wall 13 is configured is of circular cross section, the outer radius of this section is between about 9 mm and about 10.5 mm, preferably between about 9.5 mm and about 10 mm, preferably about 9.8 mm. The circumferential circumferential stop also has an outer radius of between 10 mm and about 13.5 mm, preferably between about 10.8 mm and about 12.7 mm.

Between the other end and the circumferential stop, the applicator tip may have a fixing for its attachment to a tube head. This attachment can be made in the form of a circumferential rib projecting from the annular wall. The circumferential rib may extend from about 0.1 mm to about 0.5 mm from the annular wall 13 . This circular rib participates in the snapping of the applicator tip on a tube head. The attachment can also be made in the form of a net when the annular wall 13 is circular. Moreover, the attachment is not useful when the applicator tip is fixed in force on the tube head.

The applicator tip 1 can be used in a container for cosmetic products such as eye cream, cream and / or anti-pocket cream, anti-wrinkle eye contour cream, multi-corrector ride care and anti-oxidation-anti-glycation glow, lip contour, cream for the skin. The container for cosmetic products then comprises a reservoir for containing the cosmetic product and the applicator tip as described above. Thus, the user can spread the cosmetic product with the applicator tip which gives it a feeling of freshness thanks to the cold effect. This cold effect may have various advantages depending on the cosmetic product applied, for example a cooling effect and / or soothing.

Example 1

The applicator tip of Example 1 comprises a convex outer application surface and having in its greater part a radius of curvature of 25 mm. This application surface extends along an inclined plane with respect to the axis of the applicator tip. The thickness of the material under the application surface is about 2.2 mm. The applicator tip comprises an annular wall with a thickness of 2.2 mm and configured in a cylindrical tube of circular cross section which is cut into an acute angle bevel 42 ° at one of its ends along the inclined plane. The outer radius of the circular cross section is 9.8 mm.

At the other end of the non-beveled tube, the edges of the annular wall are tapered so as to have a thickness of 1 mm.

A circular circumferential stop is provided around the annular wall and extends therefrom. The outer radius of the circular circumferential stop is 12.5 mm.

The applicator tip has a through hole 2 mm radius and intended to open into a tank of a cosmetic product tube.

Example 2

The applicator tip of Example 2 comprises a convex exterior application surface and having in its greater part a radius of curvature of 45 mm. This application surface extends along an inclined plane relative to the axis of the applicator tip. The thickness of the material under the application surface is about 4.7 mm. The applicator tip comprises an annular wall with a thickness of 4.7 mm and configured in a cylindrical tube of circular cross section which is cut into a bevel of acute angle of 42 ° at one of its ends along the plane inclined. The outer radius of the circular cross section is 9.8 mm.

At the other end of the non-beveled tube, the edges of the annular wall are tapered so as to have a thickness of 2 mm.

A circular circumferential stop is provided around the annular wall and extends therefrom. The outer radius of the circular circumferential stop is 11 mm.

Between the other end and the circumferential stop, the applicator tip has a circular rib exceeding 0.1 mm from the annular wall.

The applicator tip has a through hole 2 mm radius and intended to open into a tank of a cosmetic product tube.

Example 3

Examples of metal or organic charged plastic materials are given in Table 1 below. Table 1 Plastic 1 Plastic 2 Plastic 3 Plastic 4 Based PEEK PPS PPP PA6 Type of charges Organic: Carbon fiber and graphite Organic: Carbon fiber and graphite Organic: Carbon fiber and graphite Metallic: Mineral salts of metal Quantity of charges 40% by weight 40% by weight 40% by weight 45% by weight Effusiveness JK ^-1 .m ^-2 .s ^-1/2 7370 7130 5720 4010 Thermal conductivity W / (mK). 22 22 20 10 Diffusivity m ² / s 8.9 9.5 12.2 6.2 Density g / cm ³ 1.64 1.65 1.56 1.6

Claims (11)

Cold-applied applicator tip for cosmetic products, characterized in that the applicator tip is made of a plastic material comprising organic fillers, metal fillers or a mixture of both. An applicator tip according to claim 1, wherein the plastics material comprises organic fillers. An applicator tip according to claim 2, wherein the organic fillers are graphite, carbon fiber, or a mixture of both. An applicator tip according to claim 2 or 3, wherein the organic fillers represent at least 20% by weight of the plastic material, preferably at least 30% by weight, more preferably at least 40% by weight. Applicator tip according to one of claims 2 to 4, wherein the organic fillers represent at most 20% by weight of the plastic material, preferably at most 30% by weight, more preferably at most 40% by weight. Applicator tip according to one of claims 2 to 5, wherein the plastic material comprises a plastic base polyetheretherketone, phenylene polysulfide, polyphthalamide, polyamide, polyimide, polyoxymethylene, polyimide-amide or elastomers. Applicator tip according to one of claims 1 to 6, wherein the plastic material has an effusivity greater than or equal to 4000 JK ^-1 .m ^-2 .s ^1/2 , preferably greater than or equal to 4700 JK ^-1 .m ^-2 .s ^-1/2 , still preferably greater than or equal to 7100 JK ^-1 .m ^-2 .s ^-1/2 , still preferably greater than or equal to 7300 JK ^-1 .m ^-2 .s ^{-1 / 2} . An applicator tip according to one of claims 1 to 7, wherein the plastics material has a thermal conductivity greater than or equal to 10 W / (m.K). Applicator tip according to one of claims 1 to 8, further having a lacquered application surface with or without tint, metallized, or galvanized. Cosmetic container with a cold-applied applicator tip, comprising a reservoir for holding a cosmetic product and an applicator tip according to one of claims 1 to 9. Container according to claim 10, wherein the applicator tip has a through orifice and opening into the reservoir.

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