Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
  • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
  • C09K11/58—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing copper, silver or gold
  • C09K11/582—Chalcogenides
  • C09K11/584—Chalcogenides with zinc or cadmium
• • 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
  • C09D5/22—Luminous paints
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
  • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
  • E01F9/50—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users
  • E01F9/506—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users characterised by the road surface marking material, e.g. comprising additives for improving friction or reflectivity; Methods of forming, installing or applying markings in, on or to road surfaces
  • E01F9/524—Reflecting elements specially adapted for incorporation in or application to road surface markings

Definitions

• the present invention relates to a fluorescent coating which fluoresces in the presence of light within the ultraviolet wavelength range.
• the invention relates particularly to a coating intended for road markings, for instance markings on road verges, centre line markings, stop lines, right-of-way markings, lane arrows, pedestrian crossings, and like markings.
• the coating can also be applied to different types of signs for instance.
• daylight paints resides in the use of a pigment which fluoresces when illuminated by ultraviolet light.
• Swedish Patent Specification 9002413-4 describes, on the other hand, a road marking which is characterized in that the material that fluoresces when illuminated with light within the ultraviolet wavelength range is comprised of glass balls or glass pieces produced from a glass composi ⁇ tion that has been doped with a dope substance which causes the glass in the glass balls or glass pieces to fluoresce when illuminated with ultraviolet light.
• the present invention provides a marking which can be seen better than earlier known markings.
• the present invention thus relates to a fluorescent coating which fluoresces when illuminated with light within the ultraviolet wavelength range, said coating being intended primarily for different types of road markings and includes a material that contains a pigment for emitting one colour when illuminated with light within the visible wavelength range and material which fluoresces when illuminated with light within the ultraviolet wavelength range, and is characterized in that the material which fluoresces when illuminated with light within the ultraviolet wavelength range has been chosen to fluoresce essentially in a wavelength range of 455-555 nanometers.
• sensitivity of the human eye varies with the wavelength of light.
• the sensitivity of the eye also varies with different levels of illumination and whether foveal sight or peripheral sight is meant.
• foveal sight is meant that the gaze is concentrated straight forwards, where the focus of the eye is sharpest.
• the foveal point covers only about 0.5 degrees.
• the perception of the eye i.e. its ability to discern an object, varies greatly with for instance the state of tiredness, the mental state, the expectation of seeing an object ahead, the stress to which the driver is subjected mentally by the surroundings, and colour content.
• the anticipation of seeing an object is of particular interest with regard to driving a vehicle.
• verge lines and, to some extent, verge posts are extremely high, and consequently the eye is well able to discern a verge demarcation line in relatively low contrast conditions, even in dynamic traffic.
• the invention is based on the realization that when an edge line is produced in a fluorescent material whose fluorescence is adapted to peripheral sight and mesopic sight, the adaptation to mesopic sight will cause the gaze of the viewer to be moved further along the road, at the same time as the adaptation to peripheral sight will cause the edge line to be discerned clearly by the peripheral sight, even from close distances.
• the material that fluoresces when illuminated with light within the ultravio ⁇ let wavelength range is chosen to fluoresce essentially in a wavelength range of 455 and 555 nanometers. This provides the aforesaid effect.
• the fluorescent material will fluoresce in a substantially narrower wavelength range than that given above, namely between 470 and 540 nanometers.
• the fluores- cent material is chosen so that its colour impression relating to the colour of the fluorescence within said wavelength range will lie between a blue-violet colour and a greenish colour.
• the fluorescent material chosen is one which emits the major part of its fluorescence at a wavelength of less than 500 nanometers.
• the fluorescent material is chosen so that it will be activated to maximum fluorescence when irradiated with ultraviolet light within the wavelength range of 340-400 nanometers, preferably within the wavelength range of 350-380 nanometers. It is namely within this wavelength range that vehicle headlamps that emit ultraviolet light provide a maximum light effect.
• the fluorescent material In order to obtain a good effect also in daylight and at dusk, it is advantageous for the fluorescent material also to be activated by incident ultraviolet radiation that has a wavelength of about 400 nanometers.
• incident ultraviolet radiation that has a wavelength of about 400 nanometers.
• sub ⁇ stances which fluoresce within different wavelength ranges and which are suitable for use when practicing the inven ⁇ tion.
• Many substances emit visible light within a given spectrum, although the major part of the visible light is found within a given wavelength range.
• Typical fluorescent compounds or substances contain zinc sulphide (ZnS) with additives of silver (Ag) , sulphur (S) and cadmium (Cd) .
• ZnS zinc sulphide
• Ag silver
• S sulphur
• Cd cadmium

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Wood Science & Technology (AREA)
• Inorganic Chemistry (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Paints Or Removers (AREA)
• Road Signs Or Road Markings (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20389129

Family Applications (1)

Country Status (4)

Cited By (5)

Citations (2)

• 1993
  • 1993-03-05 SE SE9300741A patent/SE511756C2/sv not_active IP Right Cessation
• 1994
  • 1994-03-04 WO PCT/SE1994/000189 patent/WO1994020577A1/en not_active Application Discontinuation
  • 1994-03-04 EP EP94909396A patent/EP0687284A1/en not_active Withdrawn
  • 1994-03-04 AU AU62256/94A patent/AU6225694A/en not_active Abandoned

Patent Citations (2)

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