Phosphorescent highway paint composition
OwnerIrving Andersinventor
Life of this patent
Estimating the term…
Abstract
A water based luminescent highway or roadway paint composition that contains a fine powdered luminescent substance which does not require an organic solvent, a colored paint dispersion, and a polyurethane resin which is water compatible and which imparts an extended surface life under normal traffic conditions. The luminescent substance may be either a phosphorescent material or a combination of a phosphorescent and a fluorescent material. When the fluorescent material is present in the luminescent substance a daytime luminescence or reflectivity or coloration is produced in addition to the phosphorescence produced at night when light (head lights of an automobile) shine on the paint composition marking the median highway stripe or the highway edges.
Claims10
In an improved method of marking a surface for alerting or directing traffic with a water based paint composition having a colored paint dispersion which when in contact with a light source emits electromagnetic radiation in the visible spectrum wherein the improvement comprises the step of:
- enhancing visibility of the marking by applying to said surface the water based paint composition with a powdered luminescent substance comprising at least a phosphorescent substance;
- and, (b) a polyurethane resin, wherein the resin and the luminescent substance are water miscible for forming a painted marking having enhanced visibility over existing traffic markings by electromagnetic radiation consisting substantially of electromagnetic radiation within the visible spectrum throughout any twenty four hour period, and
- whereby the marking is environmentally friendly.
Dependencies are inferred from the claim text.