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WO1998034514A1 - Poils de brosse a dents - Google Patents

Poils de brosse a dents Download PDF

Info

Publication number
WO1998034514A1
WO1998034514A1 PCT/EP1998/000718 EP9800718W WO9834514A1 WO 1998034514 A1 WO1998034514 A1 WO 1998034514A1 EP 9800718 W EP9800718 W EP 9800718W WO 9834514 A1 WO9834514 A1 WO 9834514A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
filament
styrene
filaments
sheath
Prior art date
Application number
PCT/EP1998/000718
Other languages
English (en)
Inventor
Hans Kramer
Original Assignee
Smithkline Beecham Consumer Healthcare Gmbh
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 Smithkline Beecham Consumer Healthcare Gmbh filed Critical Smithkline Beecham Consumer Healthcare Gmbh
Publication of WO1998034514A1 publication Critical patent/WO1998034514A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/023—Bristles with at least a core and at least a partial sheath
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers

Definitions

  • This invention relates to toothbrushes, in particular to novel materials for toothbrush bristles and toothbrushes which incorporate such bristles.
  • Toothbrushes generally comprise a grip handle and a bristle-bearing head arranged along a longitudinal axis.
  • the head generally has a face from which project bristles.
  • Bristles are generally made of natural bristle materials or more usually in modern times of resilient plastics materials such as nylon. Suitable physical requirements for toothbrush bristle materials are defined in the art, for example in British Standards Institution publication BS 5757:1979 "Specification for toothbrushes”. Other publications such as Gerodontics (1988) 4: 45-62 suggest other desirable requirements for toothbrush bristles, such as smooth convex end rounding. Some other materials such as softer rubber fronds have been proposed for use as alternatives to plastics bristle materials, for example as gum massaging elements, e.g.
  • US 3403070 discloses hollow brush filaments which comprise a polyolefm sheath layer with an inner core of a foamed polyurethane, which are made by filling pre-formed hollow filaments with a polyurethane foam.
  • US 3327339 and JP 5123222 discloses brush filaments having an outer sheath of a soft rubber material and a core of a harder plastics material.
  • WO 97/14830 discloses coextruded monofilaments comprising a core material of a first resin and a sheath material of a second resin different from the first resin, with a pocket formed in the end of the monofilament. The monofilaments disclosed therein all comprise cores and sheaths both made of relatively hard polymers.
  • toothbrush bristle materials for example to optimise bristle stiffness, the ability of bristles to transport toothpaste materials to the tooth surfaces of the user, and the softness of the free ends of the bristles. It is an object of this invention to provide an improved filament material for use as toothbrush bristles, and an improved toothbrush incorporating such bristles.
  • a filament comprising one or more cores of a first polymeric material, surrounded by a sheath of a second polymeric material, characterised in that the first polymeric materials is a soft elastomer other than a foamed polyurethane, and the second polymeric materials is a plastics material which is harder than the soft elastomer, the core(s) and sheath being bonded together.
  • the soft elastomeric material may be a known elastomeric material.
  • soft will be understood in the elastomer art, and generally denotes an elastomeric material softer than the plastics material respectively of the sheath.
  • the hardness of the soft elastomeric material may be 30 Shore A to 60 Shore D, for example 40 Shore A to 95 Shore A.
  • the soft elastomeric material may comprise a single elastomeric material or a mixture, blend or compound of two or more elastomeric materials or of one or more elastomeric materials with other polymeric materials.
  • Suitable elastomeric materials include the general class of thermoplastic elastomers, and in particular copolyester block copolymers (such as the known material HytrelTM, supplied by DuPont), polyamide block copolymers such as PebaxTM (supplied by Atochem (FR)), thermoplastic polyurethanes (“TPU”) such as ElastollanTM (supplied by Elastogram (DE)), compounds based on styrene block copolymers such as styrene-ethylene-butadiene(or propylene) - styrene (“SEB(or P)S”), or compounds based on styrene-isoprene(or butadiene)-styrene (SI(B)S) such as Thermolast KTM (supplied by Kraiburg Kunststoffwerk GmbH & Co (DE)), styrene block copolymers such as the Kraton DTM or Kra
  • a preferred elastomer is the SEBS block copolymer Thermolast KTM, being a plasticised modified SEBS polymer compounded with polypropylene, having adhesion toward hard plastics such as polyamides and polyesters.
  • Suitable plastics materials for the sheath of the filaments, include polyamides (such as NylonTM, e.g. Nylon 6.12TM and Nylon 6.10TM) for example the material commercially available as TynexTM (supplied by DuPont de Nemours (USA)), linked polyesters such as polyethylene terephthalate (“PET”) such as RyniteTM (supplied by DuPont de Nemours (USA)), and polybutyleneterephthalate (“PBT”) such as ValoxTM (supplied by General Electric Plastics (USA)), polyolefines such as polyethylene e.g. DowlexTM (supplied by Dow Chemical Corp. (USA)) and polypropylene e.g.
  • polyamides such as NylonTM, e.g. Nylon 6.12TM and Nylon 6.10TM
  • TynexTM supplied by DuPont de Nemours (USA)
  • linked polyesters such as polyethylene terephthalate (“PET”) such as RyniteTM (supplied by DuPont
  • DaplenTM supplied by PCD (AT)
  • acrylates such as polymethyl methacrylate (“PMMA”) such as
  • PMMA polymethyl methacrylate
  • DE polycarbonates
  • OrgalanTM supplied by Atochem (FR)
  • polystyrenes such as Polystyrol (supplied by BASF (DE))
  • polyvinylic polymers such as hard PVC such as VestolitTM (supplied by Htils AG (DE)), acrylonitrile butadiene styrene (“ABS”) such as RonfalinTM (supplied by DSM(NL)), styrene acrylonitrile copolymer (“SAN”) such as LitacTM (supplied by Mitsui Toatsu Chemicals (JP)) and cellulose esters e.g.
  • CA cellulose acetate
  • CAP cellulose acetate propionate
  • CAB cellulose acetate butyrate
  • respective core and sheath materials which have adhesion toward each other.
  • elastomer and plastics materials which are of similar polarities, e.g. both being polar polymers or both being non polar polymers, so as to facilitate physico-chemical bonding between the core and sheath materials.
  • a thermoplastic elastomer such as HytrelTM may be used in a filament of this invention as a core, together with a harder plastics material sheath such as a PBT such as ValoxTM.
  • the elastomeric material and/or the harder plastics material may be chemically modified to encourage these two materials to adhere to each other.
  • some chemical treatment or modification of the materials may be preferable to achieve bonding between the core and sheath.
  • Such chemical treatment or modification is well within the competence of skilled workers in the elastomer industry, and one suitable treatment or modification to facilitate bonding is for example disclosed in EP 0 393 409 A.
  • an EPDM/PP material such as SantopreneTM may be used as a core, together with a polyamide chemically modified with polypropylene e.g. as disclosed in EP 0393409 A.
  • a chemically modified thermoplastic elastomer such as a modified SEBS may be used, such as Thermolast KTM, as a core, with a polyamide such as Nylon 6.12TM and Nylon 6.10TM especially the material TynexTM.
  • thermoplastic elastomers are preferred, and in particular modified compounded styrene block copolymers, especially Thermolast KTM, and of the above plastics materials polyamides such as Nylon 6.12TM and Nylon 6.10TM especially the material TynexTM, and polyesters such as polyethylene terephthalate and polybutyleneterephthalate are preferred.
  • polyamides such as Nylon 6.12TM and Nylon 6.10TM especially the material TynexTM
  • polyesters such as polyethylene terephthalate and polybutyleneterephthalate
  • a particularly preferred combination of elastomeric material and plastics material is Thermolast KTM and Nylon 6.12TM and Nylon 6.10TM, with the elastomeric material as the core.
  • the filaments may be made by known filament co-extrusion techniques, for example as disclosed in US patent 5313909.
  • the materials of the core and sheath may be of the same colour, or of different colours e.g. to achieve a visual effect.
  • the sheath may be transparent or translucent and the core may be coloured or vice versa.
  • the filaments of the invention, particularly the preferred filaments have been found to have advantages for use as toothbrush bristle materials.
  • the filaments may be of circular cross section, although the invention appears to be applicable to filaments of other cross sectional shapes.
  • a circular section filament there is suitably a single core, preferably also of circular section and coaxial with the filament.
  • filaments having two or more cores are also within the scope of this invention.
  • Circular section filaments may have a diameter similar to that of presently used toothbrush bristles, although they may in some cases be a little larger in diameter than presently used toothbrush bristles, for example being 0.1 - 0.4 mm, typically around 0.17 - 0.25 mm diameter.
  • the core may for example have a diameter of 10 - 80 % of the overall diameter of the filament, typically 30 - 70 %, preferably 40 - 80 %, more preferably 40 - 70 % of the overall diameter.
  • Toothbrush bristle filaments are typically 8 - 15 mm in length. Suitable proportions of overall diameter, core diameter and length for any desired stiffness of toothbrush bristle, e.g. soft, medium or hard may easily be determined by simple experiment within the competence of those skilled in the art.
  • the filaments may alternatively be of other cross sectional shapes, and the cross sectional shape of the core may be the same as or different to that of the filament itself.
  • the filaments of the invention may be made into toothbrush bristles by any of the well known methods for making filaments of known types into toothbrush bristles. Toothbrush bristles made from the filaments of the present invention may be fixed into toothbrush heads using any of the well known methods of fixing toothbrush bristles into toothbrush heads, e.g. by using small metal clips jammed into socket holes in the toothbrush head, or by fusing the plastics material of the head around the ends of the bristles. The free ends of bristles made using the filaments of the invention may be subjected to end rounding as is done with conventional toothbrush bristles. Therefore according to a further aspect of this invention there is provided the use of the above-described filaments as toothbrush bristles, toothbrush bristles comprised of the above-described filaments. According to a further aspect of this invention there is provided a toothbrush characterised in that some or all of its bristles are comprised of the above-described filaments, especially filaments according to the preferred embodiments.
  • the toothbrush of this aspect of the invention may have all of its bristles made of the filaments of this invention, or alternatively bristles made of the filaments of the invention may be combined in a toothbrush with bristles made of other materials, e.g. conventional, materials, e.g. of polyamides such as NylonTM.
  • bristles made of the filaments of this invention and bristles made of other materials the different types of filaments may be mixed together in tufts, or alternatively or additionally some tufts may be composed entirely of the filaments of the invention and other tufts may be composed only of bristles of other materials.
  • toothbrush bristles made of the filaments of the invention with an elastomer core are their fatigue characteristics under the wear and tear encountered in use in brushing the teeth. After a period of such use the deformation of the bristle field, e.g. widening, composed of bristles which are made of filaments of this invention, can be much less.
  • toothbrush bristles made of the filaments of this invention is their better adhesion to the surface of the teeth being brushed, resulting from the friction characteristics of the elastomer core compared with the lower friction surface of the plastics material sheath, and hence a better cleaning effect.
  • a small concavity can form in the exposed surface of the core at the free end of the filament, either during manufacture, end rounding or during the wear that occurs during toothbrushing. Also around the rim of this concavity the sheath can fray to surround the concavity with a small fringe of fine fibres of sheath material.
  • toothbrushes of the invention e.g. the construction and shape of the handle and head etc., may be conventional.
  • Fig. 1 shows a cross section through a filament of the invention
  • Fig. 2 shows a longitudinal sectioned view of the end of a toothbrush bristle made of the filaments of the invention, having a concavity at its end.
  • filaments 1 were made, of generally circular cross section, comprising a core 2 also of generally circular cross section, surrounded by a sheath 3.
  • the core 2 is composed of a soft elastomeric
  • the sheath 3 is composed of a harder plastics material .
  • the filaments 1 are made by a co-extrusion process by which the core 2 and sheath 3 are bonded together in the filaments 1.
  • a toothbrush bristle 4 is shown in cross sectioned view, having a core 2 and sheath 3, and being made of the filament material described and shown with reference to Fig. 1.
  • the free end has been rounded using a conventional bristle end rounding technique.
  • a small concavity 5 has formed at the free end, where the softer elastomer core has become exposed.
  • the harder plastics material of sheath 3 has split and frayed to form a fringe 6 of small fibres around the core 2 and surrounding the small central concavity 5.
  • the fringe 6 gives the bristle 4 a soft end, and the concavity 5 can accommodate particles (not shown) such as abrasives from a tooth paste material and carry them into close proximity to the surfaces of teeth being cleaned.
  • filaments 1 Two types were made.
  • the core 2 was composed of the soft elastomeric modified SEBS material Thermolast KTM supplied by Gummiwerk Kraiburg GmbH & Co
  • the sheath 3 was composed of the harder plastics material Nylon 6.12TM, in the form of HytrelTM.
  • the two types of filaments both had an overall diameter of 0.25 mm, and core diameters of respectively 0.125 mm (type A) and 0.165 mm (type B).
  • the sheath 3 was coloured blue and the core 2 white.
  • a test toothbrush was made with all of its bristles made of filaments as described above and as shown with respect to Figs. 1 and 2.
  • test bristles were subjected to a 4 month intermittent and continuous Ponzini wear test (a testing procedure widely used in the field of toothbrush bristles), and showed excellent non-wear properties.
  • test toothbrush showed better cleaning efficiency than the comparison toothbrush, type A with the smaller diameter core proving better than type B after a long period of simulated use.
  • both type A and B showed virtually no widening of the bristle field after simulated ca. 5.5 hours of simulated toothbrushing.
  • the comparison Dr BestTM toothbrush showed up to 45% widening of the bristle field as a result of these tests.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Brushes (AREA)
  • Multicomponent Fibers (AREA)

Abstract

Cette invention concerne un filament présentant une ou plusieurs âmes d'une première matière polymère qui est un élastomère souple autre qu'un polyméthane cellulaire, entourées d'une enveloppe formée d'une deuxième matière polymère plus dure que l'élastomère souple, l'âme ou les âmes et l'enveloppe étant soudées ensemble. Ces filaments sont adaptés pour être utilisés en tant que poils de brosse à dents.
PCT/EP1998/000718 1997-02-07 1998-02-04 Poils de brosse a dents WO1998034514A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP97300797.4 1997-02-07
EP97300797 1997-02-07

Publications (1)

Publication Number Publication Date
WO1998034514A1 true WO1998034514A1 (fr) 1998-08-13

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Family Applications (1)

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Country Status (1)

Country Link
WO (1) WO1998034514A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001004392A1 (fr) * 1999-07-09 2001-01-18 Coronet-Werke Gmbh Procede et dispositif pour la fabrication de poils
WO2002028222A1 (fr) * 2000-10-02 2002-04-11 E.I. Du Pont De Nemours And Company Brosse a dents a faible frottement
US6871374B2 (en) 2000-10-02 2005-03-29 E. I. Du Pont De Nemours And Company Low friction toothbrush
US8578544B2 (en) 2007-02-02 2013-11-12 The Gillette Company Oral hygiene implements having flexible elements, and methods of making the same
WO2013183908A1 (fr) * 2012-06-05 2013-12-12 주식회사 엘지생활건강 Tête de brosse à dents dotée d'une pointe à double structure, et brosse à dents la comprenant
WO2015191321A1 (fr) * 2014-06-11 2015-12-17 The Procter & Gamble Company Procédé de fabrication de filament ayant des caractéristiques de pointe et de surface uniques
WO2015191319A1 (fr) * 2014-06-11 2015-12-17 The Procter & Gamble Company Filament présentant des caractéristiques de pointe et de surface uniques
US10278485B2 (en) 2016-09-01 2019-05-07 Colgate-Palmolive Company Oral care implement and filament therefor
US10292488B2 (en) 2014-06-11 2019-05-21 The Procter & Gamble Company Filament having unique tip and surface characteristics
US10426249B2 (en) 2016-09-01 2019-10-01 Colgate-Palmolive Company Oral care implement
DE102018006789A1 (de) * 2018-08-28 2020-03-05 Perlon Gmbh Filament zur Herstellung einer Borste und Borste aus einem entsprechenden Filament
US10702057B2 (en) 2015-07-07 2020-07-07 Colgate-Palmolive Company Oral care implement and monofilament bristle for use with the same

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1073434B (de) * 1960-01-21 Roman Dietsche K.G., Aftersteg (Schwarzw.) Kunstborste
FR1286226A (fr) * 1960-04-11 1962-03-02 Synthese France Filaments, procédé et appareil pour leur confection
US3327339A (en) 1965-03-15 1967-06-27 Jerome H Lemelson Composite filaments
US3403070A (en) 1964-01-31 1968-09-24 Polymers Inc Unoriented polyolefin filament with polyurethane foam core
EP0303202A1 (fr) * 1987-08-10 1989-02-15 Gillette Canada Inc. Soie
EP0360766A1 (fr) 1988-09-19 1990-03-28 Antonio Marino Brosse à dents
EP0393409A1 (fr) 1989-04-10 1990-10-24 Ems-Inventa Ag Masses à mouler en polymères incompatibles et leur utilisation
JPH05123222A (ja) 1991-09-02 1993-05-21 Takuto Hayasaka 歯ブラシ
US5313909A (en) 1992-11-05 1994-05-24 Gillette Canada Inc. Brush filaments
WO1996015696A1 (fr) 1994-11-19 1996-05-30 Smithkline Beecham Plc Agencement de soies pour brosse a dents
WO1997014830A1 (fr) 1995-10-18 1997-04-24 E.I. Du Pont De Nemours And Company Monofilaments coextrudes

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1073434B (de) * 1960-01-21 Roman Dietsche K.G., Aftersteg (Schwarzw.) Kunstborste
FR1286226A (fr) * 1960-04-11 1962-03-02 Synthese France Filaments, procédé et appareil pour leur confection
US3403070A (en) 1964-01-31 1968-09-24 Polymers Inc Unoriented polyolefin filament with polyurethane foam core
US3327339A (en) 1965-03-15 1967-06-27 Jerome H Lemelson Composite filaments
EP0303202A1 (fr) * 1987-08-10 1989-02-15 Gillette Canada Inc. Soie
EP0360766A1 (fr) 1988-09-19 1990-03-28 Antonio Marino Brosse à dents
EP0393409A1 (fr) 1989-04-10 1990-10-24 Ems-Inventa Ag Masses à mouler en polymères incompatibles et leur utilisation
JPH05123222A (ja) 1991-09-02 1993-05-21 Takuto Hayasaka 歯ブラシ
US5313909A (en) 1992-11-05 1994-05-24 Gillette Canada Inc. Brush filaments
WO1996015696A1 (fr) 1994-11-19 1996-05-30 Smithkline Beecham Plc Agencement de soies pour brosse a dents
WO1997014830A1 (fr) 1995-10-18 1997-04-24 E.I. Du Pont De Nemours And Company Monofilaments coextrudes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 482 (C - 1105) 2 September 1993 (1993-09-02) *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001004392A1 (fr) * 1999-07-09 2001-01-18 Coronet-Werke Gmbh Procede et dispositif pour la fabrication de poils
WO2002028222A1 (fr) * 2000-10-02 2002-04-11 E.I. Du Pont De Nemours And Company Brosse a dents a faible frottement
US6871374B2 (en) 2000-10-02 2005-03-29 E. I. Du Pont De Nemours And Company Low friction toothbrush
US8578544B2 (en) 2007-02-02 2013-11-12 The Gillette Company Oral hygiene implements having flexible elements, and methods of making the same
US9504312B2 (en) 2007-02-02 2016-11-29 The Gillette Company Llc Oral hygiene implements having flexible elements, and methods of making the same
EP2856908A4 (fr) * 2012-06-05 2016-04-20 Lg Household & Health Care Ltd Tête de brosse à dents dotée d'une pointe à double structure, et brosse à dents la comprenant
WO2013183908A1 (fr) * 2012-06-05 2013-12-12 주식회사 엘지생활건강 Tête de brosse à dents dotée d'une pointe à double structure, et brosse à dents la comprenant
CN104334051A (zh) * 2012-06-05 2015-02-04 株式会社Lg生活健康 具有双层结构尖头的牙刷刷毛以及包含该牙刷刷毛的牙刷
JP2015518771A (ja) * 2012-06-05 2015-07-06 エルジー・ハウスホールド・アンド・ヘルスケア・エルティーディー 二重構造のチップを有する歯ブラシの毛およびそれを含む歯ブラシ
WO2015191319A1 (fr) * 2014-06-11 2015-12-17 The Procter & Gamble Company Filament présentant des caractéristiques de pointe et de surface uniques
US9340903B2 (en) 2014-06-11 2016-05-17 The Procter & Gamble Co Process for making filament having unique tip and surface characteristics
WO2015191321A1 (fr) * 2014-06-11 2015-12-17 The Procter & Gamble Company Procédé de fabrication de filament ayant des caractéristiques de pointe et de surface uniques
US9986820B2 (en) 2014-06-11 2018-06-05 The Procter & Gamble Company Filament having unique tip and surface characteristics
US10292488B2 (en) 2014-06-11 2019-05-21 The Procter & Gamble Company Filament having unique tip and surface characteristics
US10702057B2 (en) 2015-07-07 2020-07-07 Colgate-Palmolive Company Oral care implement and monofilament bristle for use with the same
US10278485B2 (en) 2016-09-01 2019-05-07 Colgate-Palmolive Company Oral care implement and filament therefor
US10426249B2 (en) 2016-09-01 2019-10-01 Colgate-Palmolive Company Oral care implement
US11103056B2 (en) 2016-09-01 2021-08-31 Colgate-Palmolive Company Oral care implement and filament therefor
DE102018006789A1 (de) * 2018-08-28 2020-03-05 Perlon Gmbh Filament zur Herstellung einer Borste und Borste aus einem entsprechenden Filament

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