WO1997023423A1 - Perles spheriques pour applications relatives a la reflexion de la lumiere, et procede de preparation - Google Patents

Perles spheriques pour applications relatives a la reflexion de la lumiere, et procede de preparation Download PDF

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Publication number
WO1997023423A1
WO1997023423A1 PCT/NO1996/000300 NO9600300W WO9723423A1 WO 1997023423 A1 WO1997023423 A1 WO 1997023423A1 NO 9600300 W NO9600300 W NO 9600300W WO 9723423 A1 WO9723423 A1 WO 9723423A1
Authority
WO
WIPO (PCT)
Prior art keywords
bead
beads
spherical
layer
coated
Prior art date
Application number
PCT/NO1996/000300
Other languages
English (en)
Inventor
Merete Hallenstvet
Tore Lundqvist
Jörgen RASSING
Original Assignee
Norsk Hydro Asa
Akzo Nobel N.V.
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 Norsk Hydro Asa, Akzo Nobel N.V. filed Critical Norsk Hydro Asa
Priority to AU12137/97A priority Critical patent/AU1213797A/en
Publication of WO1997023423A1 publication Critical patent/WO1997023423A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/126—Reflex reflectors including curved refracting surface
    • G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C12/00—Powdered glass; Bead compositions
    • C03C12/02—Reflective beads
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/004—Reflecting paints; Signal paints

Definitions

  • the present invention relates to spherical beads for light retro-reflective applications and a method for preparing such beads. More specifically, the invention relates to a controlled coating of optical glass beads for the use in combination with different types of substrate materials, such as foils, metals, textiles, paper, etc.
  • One traditional way of obtaining a space layer on the back side of a mono-layer of glass beads is to apply a layer of polymer materials such as transparent lacquers, polymeric melts etc. Meanwhile, the resulting space layer provided according to said method may often vary both with respect to the thickness and how the layer actually embeds the beads. If the layer embeds the beads in an insufficient manner, then the retro-reflective properties will be very poor especially at sharp angles of incidence.
  • the invention as claimed is intended to remedy these drawbacks. It solves the problem of how to obtain an accurate space layer between the bead and the reflecting material. Further, according to the invention good reflective properties may be obtained at very sharp angles, close to 180 degrees. Still further, according to the invention cheap glass beads with low refractive angles may now be used in retro-reflective applications where good reflective properties are required.
  • Figure 1 shows a spherical bead according to the invention in a retro-reflective application
  • Figure 2 shows a spherical bead according to the invention, partly coated with a reflective layer.
  • Spray drying is effective but unfortunately it suffers from poor layer thickness consistency and agglomeration. This leads to a process difficult to control.
  • Fluidized bed technology is also effective, but suffers from basically the same drawbacks as spray drying.
  • the glass beads are circulated in a vessel in a gas stream using fans.
  • the fan blows the glass beads upwards through an opening where in addition a nozzle is placed.
  • a polymeric solution or dispersion is atomised to tiny droplets.
  • the droplets are carried by the gas stream together with the glass beads.
  • the droplets have approximately the same speed as the glass beads, and they are substantially smaller.
  • the atomised droplets precipitates onto the glass beads.
  • the coating will therefore consist of numerous small droplets altogether forming a continuous layer or film spherically surrounding the glass bead, where said layer may dry and harden in the run of the process.
  • a light reflective layer can be applied to the beads.
  • Such layers may typically consist of a polymeric coating with metallic pigments, and may comprise resin, aluminium flakes, crosslinker, catalyst, solvent and flow additive.
  • the coated beads with the surrounding layer or film are treated for instance thermally in the succeeding application process, the film thus forming a homogenous and perfect spherical shape. This contributes to give the coated beads very promising optical properties.
  • Figure 1 shows a spherical bead 1 coated with a transparent layer 2.
  • the coated bead may form part of a mono layer of plural beads (not shown) that is partly embedded in a reflective layer 3 carried by a substrate 4.
  • a transparent layer 5 can be applied on top of the mono layer of spherical beads.
  • Such transparent layer can be applied by using rollers or preferably by means of coil coating and if so the transparent layer is made by a polymer coating.
  • the layer may be applied by means of foil, or possibly by a powder coating system.
  • Polymer coatings typically comprises resin, solvents, crosslinker, catalyst and flow additive.
  • Said transparent layer is smooth and is intended to provide satisfactory surface properties to the finished product. It might be coloured and may consist of several layers.
  • a polymeric foil laminated to the layer of spherical beads can be employed as a top layer.
  • Figure 2 shows a spherical bead 1 coated with a transparent layer 2 together with a reflective layer 6 that partly covers the bead.
  • the bead is embedded in a layer 7 on a substrate 4.
  • the bead shown can form a part of a mono layer, that is coated with a transparent layer 5.
  • the light reflecting material on the upper surface of the beads in the mono layer must be removed. The light reflecting material is thus partly removed by mechanical, chemical or thermal means. This results in a mono layer of spherical beads having a light reflecting material at the parts turning towards the substrate and not at the parts now making the upper surface of the beads.
  • the embedding material 7 may be coloured by pigments, for instance to increase the lightness/brightness of the object produced.
  • each spherical bead is coated by a transparent coating and/or subsequently by a light reflecting material like for instance a metallic coating.
  • coated spherical beads will have a shell acting as a space layer to provide relevant optical properties for each spherical bead.
  • the application of the coated beads in a dispersion or a lacquer typically comprising resin, solvent, crosslinker, catalyst, and anti-settling agent will sustain better stability against settling, as the coated beads will have a lower density compared to non-coated beads.
  • Transparent lacquers and metallics used in this invention as space layer and reflective coatings can be composed of different film forming polymers and/or dispersions.
  • Applicable polymer solutions are polyesters, polyurethane's, acrylics, epoxies, phenolics, polycarbonates, fluorocarbons etc. where the polymeric backbone can be functional to give thermosetting or thermoplastic properties.
  • Polymer dispersions and the like, having properties close to the solution product may be used and are usually but not necessary water based or water carried. These can be composed by the same polymeric compounds described above.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

La présente invention concerne un procédé de préparation de perles sphériques pour applications relatives à la réflexion de la lumière. Ces perles sont recouvertes d'une couche d'écartement transparente et, éventuellement, d'un revêtement réfléchissant la lumière. L'invention concerne aussi une perle sphérique (1) destinée à ces applications, cette perle étant recouverte d'une couche d'écartement transparente et, éventuellement, d'une matière réfléchissante (6).
PCT/NO1996/000300 1995-12-22 1996-12-20 Perles spheriques pour applications relatives a la reflexion de la lumiere, et procede de preparation WO1997023423A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12137/97A AU1213797A (en) 1995-12-22 1996-12-20 Spherical beads for light retro-reflective applications and method of preparing such beads

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO955241A NO301797B1 (no) 1995-12-22 1995-12-22 Retroreflekterende platemateriale og fremgangsmåte for fremstilling av slikt materiale
NO955241 1995-12-22

Publications (1)

Publication Number Publication Date
WO1997023423A1 true WO1997023423A1 (fr) 1997-07-03

Family

ID=19898873

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/NO1996/000300 WO1997023423A1 (fr) 1995-12-22 1996-12-20 Perles spheriques pour applications relatives a la reflexion de la lumiere, et procede de preparation
PCT/NO1996/000299 WO1997023788A1 (fr) 1995-12-22 1996-12-20 Materiau reflechissant en feuilles et procede de fabrication

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/NO1996/000299 WO1997023788A1 (fr) 1995-12-22 1996-12-20 Materiau reflechissant en feuilles et procede de fabrication

Country Status (3)

Country Link
AU (2) AU1213697A (fr)
NO (1) NO301797B1 (fr)
WO (2) WO1997023423A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001042349A1 (fr) * 1999-12-10 2001-06-14 Abildgaard Roadvision Aps Marquage reflectorise et procede de production et d'application d'une composition renfermant ledit marquage reflectorise
WO2001047427A2 (fr) * 1999-12-23 2001-07-05 Northern Digital Inc. Systeme de reflecteurs pour la determination d"une position
WO2005022210A1 (fr) * 2003-08-29 2005-03-10 Bae Systems Plc Dispositif retroreflechissant comportant des lentilles a gradient d'indice
EP3179235A1 (fr) * 2015-12-09 2017-06-14 BAE Systems PLC Améliorations apportées et relatives à la détection à distance
WO2017098220A1 (fr) * 2015-12-09 2017-06-15 Bae Systems Plc Améliorations apportées et se rapportant à la détection à distance
US10852201B2 (en) 2015-12-09 2020-12-01 Bae Systems Plc Remote sensing
US10955345B2 (en) 2015-12-09 2021-03-23 Bae Systems Plc Relating to remote sensing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004025325A1 (de) * 2004-05-19 2005-12-08 Erich Utsch Ag Transparente retroreflektierende Folie und Verfahren zu Ihrer Herstellung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252856B (de) * 1956-10-04 1967-10-26 Minnesota Mining & Mfg Verfahren zum Herstellen von transparenten Kugellinsen mit einem transparenten UEberzug
DE2430797A1 (de) * 1973-06-25 1975-01-16 Ludwig Eigenmann Kugelfoermiges rueckstrahlendes oder kollimationsfaehiges element fuer strassenmarkierung und aehnliche verwendungszwecke
US4342824A (en) * 1980-05-27 1982-08-03 Imaging Systems Corporation Developer with coated carrier material and method of making

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4265938A (en) * 1978-09-21 1981-05-05 Alcan Research & Development Limited Retro-reflecting sheet material and method of making same
JPS61171569A (ja) * 1984-12-28 1986-08-02 Azuma Purekooto Kk 高輝度反射塗装板の製造方法及びその方法を実施するための塗装々置
GB2171335B (en) * 1985-02-16 1988-09-01 Swintex Retro-reflective material
WO1993014423A1 (fr) * 1992-01-21 1993-07-22 Leucadia, Inc. Billes de verre noyees dans un substrat polyethylene haute densite utilise pour des articles reflechissants, comme une cloture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252856B (de) * 1956-10-04 1967-10-26 Minnesota Mining & Mfg Verfahren zum Herstellen von transparenten Kugellinsen mit einem transparenten UEberzug
DE2430797A1 (de) * 1973-06-25 1975-01-16 Ludwig Eigenmann Kugelfoermiges rueckstrahlendes oder kollimationsfaehiges element fuer strassenmarkierung und aehnliche verwendungszwecke
US4342824A (en) * 1980-05-27 1982-08-03 Imaging Systems Corporation Developer with coated carrier material and method of making

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001042349A1 (fr) * 1999-12-10 2001-06-14 Abildgaard Roadvision Aps Marquage reflectorise et procede de production et d'application d'une composition renfermant ledit marquage reflectorise
WO2001047427A2 (fr) * 1999-12-23 2001-07-05 Northern Digital Inc. Systeme de reflecteurs pour la determination d"une position
WO2001047427A3 (fr) * 1999-12-23 2002-04-11 Northern Digital Inc Systeme de reflecteurs pour la determination d"une position
US7137712B2 (en) 1999-12-23 2006-11-21 Northern Digital Inc. Reflector system for determining position
WO2005022210A1 (fr) * 2003-08-29 2005-03-10 Bae Systems Plc Dispositif retroreflechissant comportant des lentilles a gradient d'indice
US7170688B2 (en) 2003-08-29 2007-01-30 Bae Systems Plc Retroreflective device comprising gradient index lenses
EP3179235A1 (fr) * 2015-12-09 2017-06-14 BAE Systems PLC Améliorations apportées et relatives à la détection à distance
WO2017098220A1 (fr) * 2015-12-09 2017-06-15 Bae Systems Plc Améliorations apportées et se rapportant à la détection à distance
US10852201B2 (en) 2015-12-09 2020-12-01 Bae Systems Plc Remote sensing
US10955345B2 (en) 2015-12-09 2021-03-23 Bae Systems Plc Relating to remote sensing

Also Published As

Publication number Publication date
NO955241D0 (no) 1995-12-22
WO1997023788A1 (fr) 1997-07-03
NO955241L (no) 1997-06-23
AU1213797A (en) 1997-07-17
NO301797B1 (no) 1997-12-08
AU1213697A (en) 1997-07-17

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