EP1799074B1 - Cosmetic brush comprising bristles having external depressions - Google Patents

Cosmetic brush comprising bristles having external depressions Download PDF

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Publication number
EP1799074B1
EP1799074B1 EP05801947.2A EP05801947A EP1799074B1 EP 1799074 B1 EP1799074 B1 EP 1799074B1 EP 05801947 A EP05801947 A EP 05801947A EP 1799074 B1 EP1799074 B1 EP 1799074B1
Authority
EP
European Patent Office
Prior art keywords
bristle
bristles
moldable material
forming channels
forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP05801947.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1799074A1 (en
Inventor
Norbert Dumler
Paul A. Sheppard
Bryan Michael Kadlubowski
Bernd Ekkehard Fellner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of EP1799074A1 publication Critical patent/EP1799074A1/en
Application granted granted Critical
Publication of EP1799074B1 publication Critical patent/EP1799074B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D40/00—Casings or accessories specially adapted for storing or handling solid or pasty toiletry or cosmetic substances, e.g. shaving soaps or lipsticks
    • A45D40/26—Appliances specially adapted for applying pasty paint, e.g. using roller, using a ball
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B1/00—Brush bodies and bristles moulded as a unit
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/021—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups arranged like in cosmetics brushes, e.g. mascara, nail polish, eye shadow
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/0238—Bristles with non-round cross-section
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1046—Brush used for applying cosmetics
    • A46B2200/1053—Cosmetics applicator specifically for mascara
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1046—Brush used for applying cosmetics
    • A46B2200/1053—Cosmetics applicator specifically for mascara
    • A46B2200/106—Cosmetics applicator specifically for mascara including comb like element

Definitions

  • the present invention relates to a process for making a cosmetic brush, and more specifically, to a process for making a brush comprising bristles having external depressions.
  • Plastic brushes are known in the art. Several international applications describe brushes made by the injection molding process and the processes therefore. Examples include: WO 02/03831 A1 , titled Method and Device For Producing Bristle Products and Bristle Products; assigned to Coronet-Werke GmbH of Germany, German patent application DE 10201635.6 , titled Method and Device For the Production of Bristles, assigned to Coronet-Werke GmbH of Germany; German patent application DE 10212701.8 , titled Bristle, Method and Device For Its Production and Bristle Product, assigned to Coronet-Werke GmbH of Germany; and German patent application 10221869.2 , titled Method of Manufacturing a Bristle Structure on a Carrier, assigned to Coronet-Werke GmbH of Germany.
  • plastic brushes can be made by a two-step process.
  • a hollow core having a multiplicity of orifices through its surface can be formed from a first plastic material.
  • a second plastic material can be injected, under pressure, into the hollow core, so that the escaping (or "extruded") through the recesses soft plastic forms individual bristles as the second material solidifies.
  • the first and second materials can be identical, or different.
  • the position of the orifices and their shapes can be chosen to define the position of the bristles and their cross-sectional configuration.
  • the present invention provides a process for making a cosmetic brush comprising a plurality of bristles, wherein selected bristles have at least one external depression oriented in a direction parallel to the longitudinal axis of the selected bristle.
  • the invention provides a process for making a cosmetic brush in accordance with claim 1.
  • a cosmetic brush made according to the process of the present invention comprises a substantially longitudinal stem and a plurality of bristles extending therefrom.
  • Each bristle has a base associated with the stem and a free end opposite to the base.
  • Each bristle has external walls and a longitudinal axis oriented along the length of the bristle.
  • the walls of the bristle can be concave, round, planar, or convex.
  • the brush as a whole has a major axis disposed along the stem of the brush.
  • the bristles termed herein as "selected bristles,” made according to the process of the present invention have at least one external depression in their walls.
  • the depression of each of the selected bristles is oriented in a direction substantially parallel to the longitudinal axis of the bristle.
  • the selected bristle can have any suitable shape in its cross-section perpendicular to the bristle's longitudinal axis.
  • the selected bristle can have a cross-section that includes oblong, polygon, circular, curbed, rhombic, trapezoid, or any other shape.
  • the number of the depressions per bristle can also vary.
  • the bristle can have on, two, three, four, and more depressions.
  • the depression or depressions extend through the entire length of the selected bristle.
  • the depression or depressions extend only through a portion of the selected bristle.
  • the depression is located at the free end of the selected bristle.
  • the location of the depressions may vary.
  • the depressions can be located opposite to each other.
  • the depressions can be spaced substantially equidistantly from one another, as viewed in the cross-section perpendicular to the longitudinal axis of the selected bristle.
  • the bristles may have differential lengths.
  • the lengths of the bristles are such that the ends of several bristles consecutively disposed next to one another, as viewed in a cross-section of the brush perpendicular to the major axis, form an imaginary line that is straight
  • such a line can be concave or convex.
  • the bristles may be made to gradually taper from the base towards the free end.
  • the bristles may have a generally uniform thickness (with the exception of the selected bristles cross-sections of which are at least partially affected by the longitudinal depression), or taper from the free ends towards the bases of the bristles.
  • the ends of at least some of the bristles have concave depression. Those depressions are different and distinct from the depressions in the walls of the bristles, for the depressions in the free ends of the bristles are not disposed longitudinally in relation to the longitudinal axes of the bristles.
  • the longitudinal axes of the bristles and the major axis of the brush can be mutually perpendicular.
  • the embodiment is contemplated in which those are not mutually perpendicular, i.e., the axes of at least some of the bristles and the major axis of the brush form an obtuse angle or angles therebetween.
  • the brush of the present invention can be made by a process that includes a so called "injection molding” technique, i.e., a process wherein a molten material is injected, under pressure, into a closed form having a cavity of a desired shape, to fill the cavity, cooled to solidify in the cavity, and released from the cavity.
  • injection molding i.e., a process wherein a molten material is injected, under pressure, into a closed form having a cavity of a desired shape, to fill the cavity, cooled to solidify in the cavity, and released from the cavity.
  • the process for making the cosmetic brush of the present invention comprises the steps of forming a hollow stem from a first moldable material; providing a plurality of bristle-forming channels surrounding and abutting the hollow stem, each of the bristle-forming channels terminating with an end and having a length, the plurality of bristle-forming channels comprising selected bristle-forming channels, each of the selected bristle-forming channels having at least one protuberance therein; injecting a second moldable material into the hollow stem under pressure sufficient to rupture the hollow stem in predetermined locations corresponding to the bristle-foaming channels and to fill the bristle-forming channels with the second moldable material so that the second moldable material assumes the shape of the bristle-forming channels; and solidifying the second moldable material disposed in the bristle-forming channels thereby forming the plurality of bristles of the brush being made, wherein the plurality of bristles comprises selected bristles formed in the selected channels and having at least one external depression thereon.
  • the protuberances can be disposed along the length of the selected bristle-forming channels and / or at the end of the selected bristle-forming channels, depending on a desired configuration of the bristles being formed.
  • the bristle-forming channel can be formed, for example, by a plurality of plates disposed consecutively adjacent to one another, wherein mutually adjacent plates have surface patterns that form, in combination, a desired profile of the bristle-forming channel.
  • the step of forming a hollow stem from a first moldable material can be accomplished by injecting the first moldable material under pressure into a support form structured to form the hollow stem.
  • the first moldable material and the second moldable material may be identical or, alternatively, may differ from one another.
  • Fig. 1 shows an embodiment of a brush 10 that can be made according to the process of the present invention comprising a substantially longitudinal core, or stem, 260 having a longitudinal, or major, axis A, and a plurality of bristles 50 extending therefrom.
  • Each bristle has a base associated with the stem and a free end opposite to the base.
  • Each bristle has external walls and a longitudinal axis B oriented along the length of the bristle ( Fig. 5 ).
  • the walls of the bristle 50 can be concave, round, planar, or convex, Figs. 3-5 .
  • Fig. 1 also has an optional stem 20 that, via an optional locking groove 30, can be attached to a handle (not shown).
  • the brush 10 may be trimmed, to change the length of some bristles or otherwise form a particular configuration of the brush 10 in a cross-section perpendicular to the major axis A.
  • Figs. 2 shows that the trimming can be made to comprise an envelope curve 60 of approximately triangular shape with rounded or skewed corners 70 so that the bristles 50 have differential lengths. The same effect can be achieved by using a process of the present invention, and without trimming, as will be discussed in more detail below.
  • the bristles 50 have at least one external depression 120 in their walls.
  • These bristles are termed herein as "selected bristles," because the process of the present invention (described herein below) allows one to design what bristles should be structured to have at least one external depression.
  • the depressions of the selected bristles can be oriented in a direction parallel to the longitudinal axes B of the bristles, or, alternatively or additionally, can be disposed at free ends of the bristles.
  • Bristles 50 can comprise bristles having a generally round cross-section ( Figs. 4 and 6 ), bristles 50b having a generally oblong, or elongated, cross-section ( Figs. 3 and 5 ), or bristles having any other suitable general cross-section, for example, polygonal.
  • the term "oblong" refers to a geometrical shape that generally has unequal dimensions in two mutually perpendicular directions.
  • the selected bristle can have any suitable shape in its cross-section perpendicular to the bristle's longitudinal axis.
  • the selected bristle can have a cross-section that includes oblong, polygon, circular, trapezoid, or any other shape.
  • the number of the depressions 120 per the selected bristle can vary.
  • the selected bristle can have one, two, three, four, and more depressions 120.
  • the location of the depressions may vary.
  • the depressions can be located opposite to each other, Figs. 3 and 5 .
  • the depressions can be spaced substantially equidistantly from one another, as viewed in the cross-section perpendicular to the longitudinal axis B of the selected bristle ( Figs. 3-5 ) or can be differentially spaced from one another (not shown). In the embodiments shown in Figs.
  • the depressions 120 extend through the entire length of the selected bristle.
  • the depression or depressions 120 can extend only through a portion of the selected bristle, as shown, for example, in Fig. 7 .
  • the depression can extend from the base of the selected bristle and terminate before it reaches the free end of the selected bristle; or the depression can extend from the free end of the selected bristle and terminate before it reaches the base of the selected bristle.
  • the selected bristle has more than one depression wherein at least one depression extends through the entire length of the bristle, and the other depression or depressions extends only through a portion of the length of the bristle in any manner described herein above.
  • the bristles 50 may have differential lengths.
  • the lengths of the bristles 50 are such that the ends of several bristles consecutively disposed next to one another, as viewed in a cross-section of the brush perpendicular to the major axis A, form an imaginary line that is straight ( Fig. 2 , line 60).
  • such a line can be concave (not shown) or convex ( Fig. 2 , line 70).
  • the brush in its cross-section perpendicular to the major axis A, the brush may or may not be circumferentially symmetrical.
  • the bristles 50 can be made to gradually taper from the base towards the free end ( Figs. 1-6 ).
  • the bristles 50 may have a generally uniform thickness (with the exception of the selected bristles, cross-sections of which are at least partially affected by the longitudinal depression), or taper from the free ends towards the bases of the bristles 50 (not shown).
  • the ends of at least some of the bristles 50 have concave depression 110, Fig. 4 .
  • Those concave depressions 110 are different and distinct from the depressions 120 in the walls of the bristles, for the depressions 110 in the free ends of the bristles 50 are not disposed longitudinally in relation to the longitudinal axes B of the bristles 50.
  • the selected bristles can have both the longitudinal depression or depressions 120 and the concave depression 110 at the free end of the selected bristle.
  • the longitudinal axes B of the bristles 50 and the major axis A of the brush 10 can be mutually perpendicular.
  • the embodiments is contemplated; however, in which those are not mutually perpendicular, i. e., the axes B of at least some of the bristles 50 and the major axis A of the brush 10 form acute or obtuse angle or angles therebetween (not shown).
  • the brush of the present invention is made by using a technique known as "injection molding.”
  • Injection molding is, in essence, a process wherein molten plastic is deposited under pressure, or injected, into a closed form having a cavity of a desired shape, to fill the cavity, then cooled to solidify in the cavity, and then released from the cavity.
  • injection molding it is possible to form virtually any desired configuration of the bristles, including the selected bristles of the present invention.
  • the injection molding technique allows one to control the length of individual bristles, so that trimming of the finished brush may not be needed in order to form a certain cross-sectional profile of the brush, as shown, for example, in Fig. 2 .
  • the brush of the present invention is made by an injection-molding process, using a multi-component molding injection machine 200, schematically shown in Fig. 8 .
  • a hollow stem 260 is provided.
  • the hollow stem 260 can be made from any suitable material, for example, plastic or resin such as polypropylene, and may include any suitable thermoplastic or thermosetting materials.
  • the hollow stem 260 can be formed by injection-molding or any other means known in the art.
  • the hollow stem 260 is formed and disposed in the injection machine 200.
  • the hollow stem 260 may comprise any suitable shape in its cross-section perpendicular to the major axis, for example, cylindrical (shown in the exemplary embodiment of Fig. 1 ), rectangular, triangular, polygonal, or any combination thereof, or any other shape, including irregular geometric shape (not shown).
  • a plurality of bristle-forming channels 250 is provided.
  • the bristle-forming channels 250 are disposed so that their entrances abut the hollow stem 260 in predetermined locations in which the bristles 50 of the brush being constructed should be disposed after the brush has been constructed.
  • the overall configuration and geometry of the bristle-forming channels 250 corresponds to the desired overall geometry and configuration of the brush being made.
  • Each of the bristle-forming channels 250 terminates with an end and has a predetermined length.
  • the bristle-forming channels 250 can be made by any means known in the art, for example using conventional drilling techniques, laser, chemical erosion, wire electrical discharge machine (EDM), or any other suitable means.
  • the bristle-forming channels 250 can be formed, for example, by a plurality of coated plates 300 ( Fig. 11 ) disposed consecutively adjacent to one another, wherein mutually adjacent plates 300 have surface patterns that form, in combination, a desired profile of the bristle-forming channels 250.
  • the plurality of bristle-forming channels 250 include selected bristle-forming channels 250a, i.e., the channels that are structured to form the selected bristles having at least one external depression 120 thereon, as described herein above.
  • each of the selected bristle-forming channels 250a has at least one protuberance 290 therein.
  • the protuberance or protuberances 290 can be disposed along the length of the selected bristle-forming channel 250a, at the end of the selected bristle-forming channels 250a, or both, depending on a desired configuration of the selected bristle being formed.
  • a second moldable material 270 is injected, under pressure, into the hollow stem, to form the bristles ( Fig. 8 ).
  • the second moldable material can comprise the material identical to the first moldable material, or, alternatively, may differ therefrom. Only for the purposes for example, the second moldable material can comprise any suitable thermoplastic elastomer (TPE), such as, for example, styrene-ethylene-butylene-styrene (SEBS) block copolymer.
  • TPE thermoplastic elastomer
  • SEBS styrene-ethylene-butylene-styrene
  • the pressure under which the second moldable material 270 is injected should be sufficient to rupture the hollow stem 260 and form perforations in locations corresponding to the bristle-forming channels 250 and further to fully fill the bristle-forming channels 250 with the second moldable material 270 so that the second moldable material 270 assumes the shape of the bristle-forming channels 250.
  • These perforations formed in the stem 260 serve, in effect, as spinnerets for the second moldable material.
  • the second moldable material 270 that fills, under pressure, the selected bristle-forming channels 250 forms the selected bristles that have external depressions described herein above, the depressions being a "negative" of the protuberances 290 of the selected bristle-forming channels 250a.
  • the brush comprising the stem 260 and the plurality of bristles 50 extending therefrom can be released from the injection machine. If the plurality of plates 300 is used to form the bristle-forming channels 250, the plates 300 can be moved apart from one another, thereby releasing the formed bristles 50.
  • an optional step of injecting a third moldable material 280 ( Fig. 8 ) into the hollow stem 260 to fill the stem 260, can be used.
  • the bristles 50 are integrally bound to the third material 280 that has filled the stem 260.
  • the third moldable material can comprise a material identical to at least one of the first moldable material or the second moldable material, or can be chose to be different from either the first moldable material and the second moldable material.

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  • Brushes (AREA)
EP05801947.2A 2004-10-01 2005-09-30 Cosmetic brush comprising bristles having external depressions Active EP1799074B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US61586404P 2004-10-01 2004-10-01
PCT/US2005/035338 WO2006039575A1 (en) 2004-10-01 2005-09-30 Cosmetic brush comprising bristles having external depressions

Publications (2)

Publication Number Publication Date
EP1799074A1 EP1799074A1 (en) 2007-06-27
EP1799074B1 true EP1799074B1 (en) 2016-03-23

Family

ID=35613855

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05801947.2A Active EP1799074B1 (en) 2004-10-01 2005-09-30 Cosmetic brush comprising bristles having external depressions

Country Status (9)

Country Link
US (1) US20060070635A1 (ko)
EP (1) EP1799074B1 (ko)
JP (1) JP4621741B2 (ko)
KR (1) KR100858255B1 (ko)
CN (1) CN101031221B (ko)
AU (1) AU2005292346B2 (ko)
CA (1) CA2582009A1 (ko)
HK (1) HK1107235A1 (ko)
WO (1) WO2006039575A1 (ko)

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CA2582009A1 (en) 2006-04-13
US20060070635A1 (en) 2006-04-06
JP4621741B2 (ja) 2011-01-26
KR100858255B1 (ko) 2008-09-11
EP1799074A1 (en) 2007-06-27
JP2008514311A (ja) 2008-05-08
KR20070053306A (ko) 2007-05-23
AU2005292346A1 (en) 2006-04-13
HK1107235A1 (en) 2008-04-03
WO2006039575A1 (en) 2006-04-13
AU2005292346B2 (en) 2011-08-11
CN101031221A (zh) 2007-09-05
CN101031221B (zh) 2010-09-01

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