EP3515245A1

EP3515245A1 - Applicator having a microstructured surface

Info

Publication number: EP3515245A1
Application number: EP17777550.9A
Authority: EP
Inventors: Christian Hauger; Karl Hartstock-Martin; Jasmin Hamida; Moritz Beyhl; Huong BISTER
Original assignee: Geka GmbH
Current assignee: Geka GmbH
Priority date: 2016-09-23
Filing date: 2017-09-25
Publication date: 2019-07-31
Also published as: CN109715008A; BR112019005654A2; US20190261770A1; JP2019528923A; WO2018055173A1; DE202016105318U1

Abstract

The invention relates to an applicator comprising a bristle carrier that has bristles (1) formed thereon, the surface of said bristles (1) being microstructured in at least some sections since, in the region of the microstructured surface, a plurality of grains (2, 3) project randomly from the bristle core (4), are connected to the bristle core (4) only along less than 40% and preferably less than 35% of their outer surface, and have an average diameter (ØM1, ØM2) of less than or equal to 125 μm and preferably less than or equal to 90 μm.

Description

APPLICATOR WITH MICROSTRUCTURED SURFACE

SCOPE OF THE INVENTION

The invention preferably relates to an applicator with bristles which have a microstructured surface, moreover, the invention also offers an option for brushless applicators.

TECHNOLOGICAL BACKGROUND

In the field of bristled applicators, a distinction is basically made between wire-core applicators in which bristles are held clamped in the form of short-cut filaments between two twisted wire cores, and injection-molded applicators in which the core of the applicator together with the bristles formed thereon by injection molding will be produced. Each bristle has an individual bristle cavity in which the

Includes plastic compound to then form the bristle.

Last but not least, injection molded bristles have the problem that the surface of the bristle is quite smooth and therefore the storage capacity for the respective cosmetic composition is kept within manageable limits. Due to this, attempts have hitherto usually been made by the most diverse embodiments of the spaces between the bristles, the

Storage capability of an applicator to improve. Deposits are created between the bristles in which more mass can be stored. Other proposals are to use a flock instead of bristles, which is quite absorbent and therefore can store a considerable mass. However, such applicators are rather disadvantageous where not only a larger amount of cosmetic mass has to be transferred, but also a combing or a curling is desired, as in the case of mascara applicators. In addition, the adhesive used in the flocking is disadvantageous. It leads to a disadvantageous adhesion of small flock pieces, which makes it difficult to obtain a precisely defined surface texture which is only dependent on chance. In addition, the adhesive makes an already provided on the blank

Profiling mostly ineffective by adding them.

Because of this, bristles have already been proposed by the PCT application PCT / EP2015 / 067694, in whose

Plastic matrix in the course of injection molding solid particles have been embedded, some of them outward over the

Protect the plastic surface of the injected bristles. This technology works very well in itself. In some applications, a certain disadvantage of this technology is that the degree to which the

Overcome solid particles and the protruding geometry, difficult or impossible to vary.

OBJECT OF THE INVENTION

In contrast, the object of the invention is another

Improvement and adjustability of the mass storage capacity of the bristles to achieve. THE SUCCESSFUL SOLUTION

To solve this problem, an applicator with a

Bristle carrier and molded bristles specified. The

Bristles are characterized by their surface

is microstructured. The microstructuring can only

be attached in sections, for example in the form of local rings which surround the bristle in the circumferential direction or of local stripes extending in the direction of the longitudinal axis of the bristle along this. Preferably, the majority of the surface of the bristle is microstructured, ideally the entire bristle.

The microstructuring takes place in that, in the area of the microstructured surface, a large number of grains protrudes confusedly from the bristle core. In the context of the invention, a confused projection means a random arrangement, in contrast to a directed arrangement in rows or in a matrix-like manner

Fields or with a recurring rapport.

The said grains are characterized by being connected to the bristle core only along less than 40%, or better still less than 35%, of their original free outer surface. The unconnected part of the surface is exposed to the outside and therefore for wetting with the cosmetic composition

Available.

The individual grains have a mean diameter of <125 μπι and preferably has a mean diameter of <90 μπι. The invention refers to the mean diameter of a grain here and everywhere the diameter of the imaginary smallest sphere into which the grain in question can still be inscribed, if one imagines it detached from the bristle-core.

Figuratively speaking, the teaching of the invention goes there, the

Surface of a bristle purposefully equipped with a certain number of "sprinkles", which you one, within wide limits

taxable, give roughness. The latter can be targeted

be exploited to improve the wettability of the bristle with and / or the adhesion of the cosmetic composition to the bristle. In this way, the storage capacity of the

Bristle surface can be adapted specifically to each of the bristle to be transferred cosmetic and its rheological properties.

Of course, this surface structure can no longer be mastered by means of injection molding, since such a

Microstructuring would not be feasible. The

However, microstructuring can work well with the well-known, also from the field of "rapid prototyping" three-dimensional

Plastic printing or laser sintering of plastics are produced, or generally with a primitive forming process. Here only the melting times have to be skilfully controlled so that no substantially smooth surface is melted. Instead, the laser beam must be directed and / or focussed so that it only partially and locally by appropriately localized grains used as raw material

Melting with the bristle core connects. Furthermore, a control over the mean particle sizes of the used

Reach granules. FURTHER OBJECT OF THE INVENTION

Another object of the invention is to achieve a further improvement and adjustability of the mass storage capacity of bristle-free applicators.

THE INVENTION SOLUTION OF THE FURTHER TASK

To solve this further object, an applicator with a particularly structured cosmetic application surface is specified. Under a Kosmetikauftragsoberfläche here is understood in any case a surface that belongs to a delicate applicator whose actual applicator body (without stem and

Cap) completely in an imaginary cylinder with a radius of 2 cm and a length of 8 cm.

This cosmetic application surface may be a surface consisting of single surfaces formed by bristle shells, together with the single surfaces found in the area of the bristle field between the bristles. However, this is preferably the cosmetic application surface of an applicator designed without protruding bristles, fingers or pins.

The cosmetic application surface according to the invention is characterized in that its surface is microstructured. The microstructuring may be applied only in sections, for example in the form of local rings, which the

Applicator circumferentially encompass or from local islands, preferably as an ordered pattern on the entire Cosmetic application surface are arranged. Preferably, the majority is the cosmetic application surface

microstructured, ideally the whole

Cosmetics order surface.

The microstructuring takes place here also in that in

In the area of the microstructured surface, a plurality of grains protrudes from the bristle core. Under a confused Abstehen within the meaning of the invention is meant a random

Arrangement, as opposed to a directed arrangement in rows or matrix-like fields or with a recurring

Rapport.

Available.

The individual grains have a mean diameter of <125 μπι and preferably has a mean diameter of <90 μπι. As the average diameter of a grain, the invention here and everywhere denotes the diameter of the imaginary smallest sphere into which the grain in question can still be inscribed, if one imagines it detached from the bristle core.

Figuratively speaking, the teaching of the invention goes there, the

Targeting the cosmetic application surface with a certain number of "sprinkles" that give it a controllable roughness within a wide range be exploited to the wettability of the

Cosmetic application surface with and / or the adhesion of

Cosmetic paste to improve the cosmetic application surface. In this way, the storage capacity of the

Cosmetic application surface targeted to each of the

Cosmetic application surface to be transferred cosmetic and its rheological properties are adjusted.

Of course, this surface structure can no longer be mastered by means of injection molding, and therefore the manufacturing instructions already given above also apply here.

PREFERRED FASHION POSSIBILITIES

It has in both cases mentioned as appropriate

proved that the set of grains used for the microstructuring of the surface first grains comprises or even completely consists thereof, which have a mean diameter of greater than or equal to 30 μπι and preferably greater than or equal to 40 μπι. For such grains, which are small but not too small, can in most cases produce a particularly good one

Make contact between the usual cosmetic masses and the, using these grains microstructured bristle.

In some cases, it may be favorable that between or at the first grains a plurality of second grains is distributed, which protrude according to the invention of the bristle core and / or protrude in a corresponding manner from the first grains and their average diameter <30 μπι or better <25 μπι. The sprinkling of such second, smaller bodies can do so contribute to further increase the wettable surface and then, for example, in critical cosmetic substances

To delay dripping.

As already mentioned, the bristle does not have on its entire surface an inventive

Have microstructuring. It may be sufficient if the bristle casing in any case has an area of 1 mm ² , on the at least five, more preferably at least eight grains in the

stand out above manner.

For large-scale microstructures this measure

ideally completely or at least maintained on the majority of the microstructured surface.

It has proven to be particularly favorable when between the point at which the first grain is connected along its circumference or at its periphery to the bristle core, and the

maximum extent, which has the freely projecting outwardly first grain, at least locally, preferably at least 70% around an undercut exists. In this way, the grain in question, like an anchor, can dive into the layer of the cosmetic mass that loads the bristle in a form-fitting manner and thereby ensure a particularly good hold of the cosmetic mass.

The holding function that unfolds the microstructured surface compared to the cosmetic mass can be improved even further by having a plurality of grains having an undercut of the said type on an area of 1 mm ²

can be found, which are positioned immediately adjacent. The grains should not touch, but - in the Essentially seen in the radial direction - above the area in which they are each connected to a bristle core, the smallest distance from each other, from where their distance to the area in which they are connected to the core, increases again.

It is particularly advantageous if the microstructuring of the surface is controlled such that at least 25%, better still at least 30%, of the free surface of the bristle is in the region of a radial undercut. The term "free

Surface "defines a surface that is freely accessible from outside by any means - the said path does not have to be a straight path, but a path that does not have other grains

crossed, but always runs in the airspace. An undercut is a free space from which in a purely radial direction (perpendicular to the longitudinal axis of the bristle) no straight path leads out.

It may be particularly favorable to equip not only the bristles with the above-described microstructure, but

optionally also the bristle carrier in its bristle-free area, which lies between the surrounding bristles rising from the bristle carrier, with a microstructured

To equip surface of the type described above. In this way, the wettability or the

Mass storage capacity of the bristle carrier can be adjusted.

Applicators have proved to be particularly favorable, which are distinguished by the fact that the applicator core or cup carrier is a cast, extruded or injection-molded plastic part or a metal part with bristles applied in layers thereon. A particularly cost-effective Production can be achieved if the plastic injection-molded part or the metal part is already equipped with a set of bristles (eg by injection or inserted filaments) and only additional bristles or special posts with the help of a

Forming layer forming process be applied and / or existing bristles by mere coating using the original forming layer molding process with the microstructured surface according to the invention.

This is especially true where non-bristled applicators, such as for use as lip applicators, are provided with the microstructured surfaces of the present invention.

Here it is particularly useful by injection molding or

otherwise to use urgeformte applicator blanks to thereby produce a finished applicator, that the inventive microstructured surface is applied to the blank by means of the original forming layer molding process. If preferred, the microstructured according to the invention

Surface to be applied only locally are in the

Applicator blank preferably recesses provided, which are filled by the original forming layer forming process. As a result, a particularly good anchoring of the microstructured surfaces according to the invention can be achieved and a selective demarcation between microstructured regions and regions having a conventional surface finish.

Protection is also desired for the production of such an applicator and / or for the production of an applicator with the surface structured according to the invention. Protection is also claimed for an applicator, which is characterized in that a portion of the bristles are injection molded bristles, between the subsequently using a

Forming layer forming method additional bristles have been incorporated and for a method for producing such an applicator.

Accordingly, protection is also claimed for methods for

Production of an applicator, also of the type already described, which is characterized in that an applicator core or bristle carrier is produced as the injection molded part, which is subjected to the layered application of the bristles to a treatment and preferably to a corona treatment, which the

Surface tension of said applicator core or

Bristle carrier is increased and preferably adjusted so that it increases the polar component of the surface tension.

It is particularly advantageous if the surface tension of the material of said applicator core or bristle carrier is set greater than the surface tension of the material to be applied.

Protection in combination with previously claimed features but also isolated protection, completely independent from before

claimed features, will also apply to an applicator

claimed, the edge layer, at least where it is structured beyond the surface roughness, which extends to +/- 2/1000 mm, has a support content of less than or equal to 50%, measured to a depth of 2/10 mm and better to a depth of 4/10 mm. The measurement is carried out in such a way that the outermost surface of the surface layer - if necessary of one Surface tip to the immediately adjacent surface tip - a straight line is laid. From there, it is measured radially inward by the said amount, namely 2/10 mm or, preferably, 4/10. The percentage of "air" measured within this strip is, on average, at least equal to or greater than the proportion of plastic measured within that strip.

Generally, the applicator is where he has the

has surface structure according to the invention, preferably

is carried out in a solid state, d. H. only one single

Plastic material exists.

Other modes of operation, advantages and design options will be apparent from the following, figuratively described embodiment.

LIST OF FIGURES

FIG. 1 shows an exemplary embodiment of a bristle which according to the invention is microstructured in the region of its tip, a good part of the tip has been broken away, which is illustrated by the view of the hatched bristle core.

FIG. 2 shows a detail enlargement from the left flank of the microstructured bristle tip according to FIG. 1.

FIG. 3 illustrates the essential dimensions of a

bristle according to the invention and their lateral deflectability. Figure 4 illustrates the application of the invention to a lip applicator not entirely covered with bristles.

Fig. 5 shows the application of the invention to another entirely not bristled, but additionally provided with a macroscopic structuring lip applicator, here weine partial sectional view with weggeschnittenem

Front part is shown.

DESCRIPTION OF THE EMBODIMENTS

FIRST EMBODIMENT

FIG. 1 shows the upper part of a plastic bristle which can form the trimming of a bristle applicator according to the invention.

The length LAE of a bristle according to the invention is generally between 3 mm and 10 mm. The maximum bristle diameter DB of a bristle according to the invention is generally between 0.01 mm and 0.05 mm.

The bristle of the invention is preferably flexible, i. she can be deflected to the side. Typically, that is

Flexibility so great that the bristle tip reversibly elastically by the forces occurring during application by at least four times, better by at least six times the amount BT of the maximum bristle diameter (measured above the rounding with which the bristle in the bristle carrier may transition) to the side can deflect, as shown in the figure 3. It is particularly favorable if the bristle tapers from its foot to its tip and preferably a middle one

Cone angle AP from 0.2 ° to 10 °.

The applicators of the invention typically have between 75 and 750 bristles of the type described herein.

It should also be noted that the plastic of the bristles does not have to be identical to the plastic of the bristle carrier, even if the bristles of the bristle carrier merge into one another in one piece. Furthermore, it may be advantageous to produce the bristle along different regions of different plastics. For example, it has proved to be favorable, the bristles in their foot from a particularly elastic plastic

to create at this point a kind of joint around which the bristle can be pivoted back and forth.

In the bristle shown in FIG. 1, only the region of the bristle tip is provided with the microstructuring according to the invention. In addition, even more isolated regions of the bristle may be provided with such a microstructure. For example, the above-mentioned one or more spaced-apart rings, which girdle around the circumference of the bristle, so be equipped. For some others

Applications are particularly advantageous to provide the entire bristle with the microstructuring according to the invention.

SECOND EMBODIMENT

A second embodiment of the invention is illustrated by the upper half of Fig. 4, a third Embodiment through the lower half of Fig. 4. It is a lip applicator. The blank this

Lip applicator is preferably made as an injection molded part. Subsequently, the lip applicator in the manner already described above with sections with the

According to the invention microstructured surfaces have been equipped.

In the case of the second embodiment, the end face 6 of the lip applicator, which is intended to receive a certain amount of the cosmetic to be applied from the stock and to apply it to the lips, has been equipped according to the invention.

As can be seen, here according to the invention 6 microstructured first regions 7 are provided at the edge of the end face. These regions 7 are preferably microstructured in such a way that the

Applying cosmetic to them adheres particularly well to them. In this way, a blobbing can be avoided or delayed - as it otherwise threatens to occur that a certain amount of the viscous cosmetic initially absorbed by the end face 6 slips off and finally drips over the edge of the face.

The hold can be further improved if in addition also second (usually 5 to 25 pieces) microstructured areas 8 are present. These further microstructured regions 8 are preferably formed as separate islands, each of which ideally has a circular, oval, elliptical or plum-like surface extension. Preferably, the microstructured surface takes in this embodiment, only the smaller part of the intended purpose as application surface area (usually that is the

Face).

The third embodiment depicts the lower half of FIG. 4.

In the case of the third embodiment, the end face 6 of the lip applicator, which is intended to receive a certain amount of the cosmetic to be applied from the supply and to apply to the lips, has also been equipped according to the invention. For this purpose, microstructured regions 9 are provided, which in this case preferably have the shape of concentric or equidistantly arranged rings. Between the microstructured regions, conventional annular regions 10 may also be provided. This arrangement can affect the mass storage and mass delivery behavior extremely positive. With appropriate

Design of the surface structure according to the invention, the microstructured areas 9 deduct an increased amount of the cosmetic from the supply and transport to the skin area to be treated. During application, a portion of the mass stored by the microstructured areas is then displaced into the conventional areas and then released by them very quickly to the area of the skin to be treated.

It should also be noted that the invention

microstructured surface and a macroscopic

Spatially superimpose surface structure and preferably also in increase their impact. This will be on the fourth

Embodiment apparent that Fig. 5 illustrates. Here macroscopically raised areas 11 are executed on the lip applicator. At least one speaks of structures that are at least in one direction with respect to their immediate, on both sides along the said direction max. 3 mm away from the environment (FIG. 5, dimension W) by at least 0.8 mm (FIG. 5, dimension A).

The fact that the raised regions of FIG. 5 are additionally provided with the microstructured surface according to the invention allows the mass storage capacity of the valleys 12 to be increased significantly.

Depending on the rheology of the cosmetic mass to be applied, it may be expedient alternatively to equip only the valleys 12 with the microstructured surface according to the invention or to additionally provide the valleys 12 with the microstructured surface.

DETAILS OF MICROSTRUCTURING USED IN THE EXAMPLES

The details of the microstructuring according to the invention can be seen well (for the example of a bristle) with reference to FIG.

As you can see, the bristle has a bristle core 4. The

Bristle core 4 may have a homogeneous structure or a granular structure. It is also possible to speak of a homogenous structure when there are local air pockets or local gaps are (not shown in the drawing), as long as they do not reduce the strength and elasticity of the bristle so much that the bristle no longer shows the flexibility mentioned above.

The following explanations apply mutatis mutandis to a bristle-free applicator. He can then also one

corresponding applicator core having a homogeneous structure or a granular structure. Of a homogeneous structure, one can then speak in this case, if local

Air pockets or local gaps are noted (not shown in the drawing) as long as they do not significantly reduce the strength and elasticity of the bristle.

For both embodiments, the following applies mutatis mutandis:

As can be seen, are in the microstructured area a number of grains 2, 3 from the surface of the bristle 1 from. As can be clearly seen from Figure 2, these grains have a free, i. the outermost local limit of the outer surface forming the bristle here. The shortest thought

Section surface over which one can cut off the respective grain of the bristle core 4 mind, is less than 40% of the free in the grains 2, 3 essential for the invention

Outer surface of the respective grain.

The grains have a certain size. How this size is determined, can also be seen well with reference to FIG 2. A mental sphere is formed into which the grain to be measured is inscribed. The radius of the smallest possible sphere into which the grain (optically measured) is still inscribed can, represents the average diameter 0M of the grain. This mean diameter 0M is in the grains of the invention <125 μπι.

Preferably, a distinction is made here between larger first grains 2 and smaller second grains 3; these two types of grains can also be easily recognized in FIG.

The larger grains 2 are characterized by the fact that they have a mean diameter 0M of at least 30 μπι. In contrast, the preferably additionally present smaller grains 2 characterized by the fact that they have a mean diameter 0M of <30 μπι and preferably even of <25 μπι.

As can be easily understood from Figure 2, forms the

Microstructuring according to the invention a wild rugged

Surface with many undercuts, which are dimensioned so that they can be filled by the cosmetic mass. In this way, many projections and arise

Recesses where the cosmetic mass can find support. Therefore, even if the cosmetic composition is more adjusted so that it does not readily wet a smooth plastic surface, it provides a good loading of this surface with the cosmetic composition.

The holding effect can be enhanced if the

Manufacturing process is adjusted so that regularly occur grains that are immediately adjacent, but do not touch. These grains are then conveniently attached to the bristle core so that their distance from there, where they have the smallest distance KA from each other, up to the

Area B, by being attached to the bristle core, enlarged again.

In this way become opposing ones

Undercuts created that develop a particularly good holding effect.

Such a constellation is shown figuratively in Figure 2 just above the middle and marked with Be zugs sign.

Whenever an applicator core or bristle carrier as a prefabricated part and in particular as an injection molded part

is made to layered on a textured one

Apply surface or bristles, it makes sense the

Surface of said blanks of a preparatory

Treatment to ensure a good adhesion of the material to be applied. This applies not least if the blank is made of polyethylene, polypropylene and polyester.

Suitable treatment methods here are the corona treatment and possibly alternatively the fluorination or the flame or

Plasma treatment. The aim of these methods is to increase the polarity of the surface, thereby improving wettability and

chemical affinity can be significantly improved.

The corona treatment is usually "in line" at the end of the

Production process of the blank performed. The blank, z. B. a cylindrical bristle carrier still without bristle approaches, it is exposed to a high-voltage electrical discharge.

This occurs between a grounded, polished plate or roll of steel or aluminum and a tight-fitting insulated electrode.

Depending on the field of application, it is also possible to use an insulated roller against uninsulated electrodes.

The bristle carrier rotates around the electrode. The electrode is powered by a high frequency generator

an alternating voltage of 10 to 20 kV and

a frequency between 10 and 60 kHz supplied.

LIST OF REFERENCE NUMBERS

1 bristle

2 first grain

3 second grain

4 bristle core

5 undercut

6 end face of the lip applicator (application surface)

7 (first) with a microstructured surface

equipped area

8 (second) with a microstructured surface

equipped area

9 (others) with a microstructured surface

equipped area

10 conventional area

11 (macroscopic) raised area

12 valley

R radial direction

B area in which a grain is attached to the bristle core 4

KA smallest distance from 2 immediately adjacent grains

L longitudinal axis of a bristle

0M mean diameter of a grain

0Max maximum circumference of a grain

LAE bristle length

DB bristle diameter, max

BT Amount by which a bristle can be reversibly deflected AB Mean cone angle / angle of inclination of a bristle

A measure of the elevation of the raised area

W measure of distance of elevation from a non-raised area (valley)

Claims

PATENTAN'S PRIDE

1. Applicator with a bristle carrier and molded on it

Bristles (1), characterized in that the surface of the bristles (1) is microstructured at least in sections, in the area of the microstructured surface, a plurality of grains (2, 3) project from the bristle core (4) confused only along less as 40% better less than 35% of its outer surface with the bristle core (4) are connected and having a mean diameter (0M1, 0M2) of less than or equal to 125 μπι, better of less than or equal to 90 μπι.

2. applicator with a Kosmetikauftragsoberfläche, thereby

characterized in that the Kosmetikauftragsoberfläche is at least partially microstructured by in the area of the microstructured surface a plurality of grains (2, 3) confused by the Kosmetikauftragsoberfläche that connected only along less than 40% better less than 35% of its outer surface with the Kosmetikauftragsoberfläche are and have a mean diameter (0M1, 0M2) of less than or equal to 125 μπι, better of less than or equal to 90 μπι.

3. An applicator according to claim 1 or 2, characterized in that the grains (2, 3) comprise first grains (2) or consist entirely of first grains (2), an average diameter (0M1) of at least 30 μπι and better at least 40th μπι have.

4. Applicator according to one of claims 1 to 3 characterized in that a multiplicity of second grains (3) are distributed randomly between or on the first grains (2), which protrude according to claim 1 from the bristle core (4) and / or in a corresponding manner from the first grains (2) , And whose average diameter (0M2) is less than or equal to 30 μπι, better less than or equal to 25 μπι.

5. Applicator according to one of claims 1 to 4, characterized

characterized in that the bristle shell in any case has an area of 1 mm ² , on the at least 5 better at least 8 first grains (2) protrude in the aforementioned manner.

6. Applicator according to one of claims 1 to 5, characterized

in that at least locally, preferably at least locally, between the point at which a first grain (2) is connected to the bristle core (4) along its circumference and the maximum circumference (0Max) of the freely projecting first grain (2) around an undercut (5) exists.

7. An applicator according to claim 6, characterized in that on an area of 1 mm ^{2 a} plurality of undercut (5) having grains (2), the immediately adjacent

are positioned, wherein the grains (2) are not touching, but - seen in a substantially radial direction (R) - above the region (B), in which they are respectively connected to the bristle core, the smallest distance (KA ), from where their distance to the area (B), in which they are connected to the Bostenkern (4), increases again.

8. Applicator according to one of the preceding claims, characterized characterized in that at least 30% of the free surface of the microstructured Bostenabschnitts lie in the region of a radial undercut (5).

9. An applicator according to any one of the preceding claims, characterized in that the bristle carrier in the bristle-free area between surrounding bristles has a free surface is at least partially microstructured by projecting in the region of the microstructured surface a plurality of first grains of the bristle core, which only along less than 40%, better still less than 30%, of its outer surface are connected to the bristle core, and having a mean diameter of less than or equal to 125 μπι, better of less than or equal to 90 μπι have.

10. An applicator according to any one of the preceding claims, characterized in that the applicator core or bacon carrier is a plastic injection molded part or a metal part without bristles or with bristle stumps, with layers applied thereto bristles.

11. An applicator according to claim 9, characterized in that a part of the bristles are injection-molded bristles, between which subsequently additional bristles have been installed by means of a primary shaping layer molding process.

12. Applicator, preferably according to one of the preceding

Claims, characterized in that the carrying portion of the measured up to a depth of 2/10 mm and better to a depth of 4/10 mm edge layer of the applicator <50%.

13. A method for producing an applicator according to claim 10, characterized in that as an injection molded part

Applicator core or bristle carrier is produced, the before the layer-wise applying the bristles of a

Treatment and preferably subjected to a corona treatment, the surface tension of said

Applicator core or bristle carrier is increased and preferably adjusted so that it increases the polar component of the surface tension.

14. The method according to claim 10, characterized in that the surface tension of the material of said

Applicator core or bristle carrier is set to be greater than the surface tension of the material to be applied.