Metering brush for targeted local application

Abstract

The invention concerns a brush for metered application of a cosmetic or pharmaceutical liquid with a configuration from a number of at least essentially parallel-arranged bristles, which are grouped around a configuration center, in which the bristles are molded onto a bristle support, the configuration having an outer configuration area enclosing the configuration center in the peripheral direction, in which the bristle density is higher than in the inner configuration area enclosed by the outer configuration area and/or whose bristles are finer than the bristles of the inner configuration area.

1 . A brush for metered application of a cosmetic or pharmaceutical liquid, the brush having a bristle configuration comprising:
 a plurality of at least essentially parallel-arranged bristles, which are grouped around a configuration center wherein the bristles are molded onto a bristle support;   an outer configuration area enclosing the configuration center in a peripheral direction, in which bristle density is higher than in an inner configuration area enclosed by the outer configuration area and/or bristles in the outer configuration area are finer than bristles in the inner configuration area.   
     
     
         2 . The brush for metered application according to  claim 1 , wherein the inner configuration area includes a central area that is completely bristle-free. 
     
     
         3 . The brush for metered application according to  claim 1 , wherein the inner configuration area comprises confinement bristles, which delimit an essentially bristle-free spatial volume in the configuration center, wherein the essentially bristle-free spatial volume in the configuration center forms a drop space, in which a dose of a liquid being applied can collect, wherein the drop space is large enough so that the drop space produces abrupt release of most of the liquid being applied in the form of a drop, when a surface being treated is touched. 
     
     
         4 . The brush for metered application according to  claim 3 , wherein a volume of the drop space (as a function of bristle length, density of the enclosing bristles, drop behavior and surface tension of the liquid being applied) is chosen small enough that a drop can be held at least 5 seconds before the drop drips out as a whole by itself. 
     
     
         5 . The brush for metered application according to  claim 3 , wherein the drop space has a bristle-free base surface, which corresponds to at least 3.5 times a cross-sectional area occurring in a foot area of one of the confinement bristles, in which case the bristle-free base surface is rotationally symmetric. 
     
     
         6 . The brush for metered application according to  claim 3 , wherein the drop space has a bristle-free base surface that corresponds to a maximum of 15 times a cross-sectional area of one of the confinement bristles. 
     
     
         7 . The brush for metered application according to  claim 1 , wherein distal ends of the bristles of the inner area protrude beyond distal ends of the bristles of the outer area. 
     
     
         8 . The brush for metered application according to  claim 3 , wherein the confinement bristles protrude beyond distal ends of all other bristles of the bristle configuration. 
     
     
         9 . The brush for metered application according to  claim 1 , wherein a distal end of the bristle configuration of the inner area and the outer area is configured as conically tapered as a whole, so that an imaginary surface that the distal bristle ends span (envelope surface) is essentially a conical surface with a vertex angle α for which 35°≦α≦55° applies. 
     
     
         10 . The brush for metered application according to  claim 3 , wherein the confinement bristles are set up in one row and a row of limitation bristles is enclosed on its side facing away from the drop space by at least an additional row of bristles, wherein the bristles in the additional row of bristles are separated from each other by a larger bristle spacing than a maximum spacing Ab max  of the confinement bristles. 
     
     
         11 . The brush for metered application according to  claim 1 , wherein the bristles in a foot area that is directly above the beginning of the rounding with which the bristles grade into the bristle support have a bristle foot diameter DF for which DF≦0.06 mm applies. 
     
     
         12 . The brush for metered application according to  claim 3 , wherein the confinement bristles have a bristle length LB for which 2.75 mm≦LB≦5.5 mm applies. 
     
     
         13 . A brush for metered application of a cosmetic or pharmaceutical liquid, the brush having a bristle configuration comprising:
 a plurality of at least essentially parallel-arranged bristles, which are grouped around a configuration center, wherein the bristles are molded onto a bristle support; and   confinement bristles, which in the configuration center directly delimit a bristle-free spatial volume and are delimited from a remaining bristle configuration.   
     
     
         14 . An application system consisting of a brush according to  claim 13  and an agent to be applied, the agent comprising an eyelash growth serum, wherein the agent has a surface tension that is less than a surface tension of pure water, wherein an arrangement of the bristles relative to each other and/or a bristle length, and parameters that determine flow and drip behavior of the agent, are adjusted so that the bristle configuration can hold a predetermined amount of the agent mostly stored in its drop space and can release the agent again on contact with a skin part being treated. 
     
     
         15 . A use of the brush according to  claim 1  for application of an easily flowing cosmetic and/or pharmaceutical to human or animal hair, especially the skin of an eyelid.