초록

The present invention relates to retroreflective elements and retroreflective articles such as pavement markings comprising retroreflective elements, methods of making retroreflective elements, and laminates.

대표청구항 ▼

What is claimed is: 1. A pavement marking comprising retroreflective elements having an exposed outer viewing surface comprising optical elements having approximately the same refractive index partially embedded in a binder wherein the coefficient of retroreflected luminance of the pavement marking

What is claimed is: 1. A pavement marking comprising retroreflective elements having an exposed outer viewing surface comprising optical elements having approximately the same refractive index partially embedded in a binder wherein the coefficient of retroreflected luminance of the pavement marking is at least 2000 mcd/m2/lux when dry and at least 1500 mcd/m2/lux when wet. 2. The pavement marking of claim 1 wherein the exposed outer viewing surface comprises preformed retroreflective sheeting. 3. The pavement marking of claim 2 wherein a cross-section of at least a portion of the retroreflective elements comprises an edge of the sheeting in a shape of at least one coil. 4. The pavement marking of claim 2 wherein a cross-section of at least a portion of the retroreflective elements comprises an edge of the sheeting in a substantially circular shape. 5. The pavement marking of claim 1 wherein at least a portion of the retroreflective elements comprise an outside diameter ranging from about 0.5 mm to 4 mm. 6. The pavement marking of claim 1 wherein at least a portion of the retroreflective elements comprise a substantially solid core. 7. The pavement marking of claim 1 wherein at least a portion of the retroreflective elements comprise a cavity. 8. The pavement marking of claim 7 wherein the cavity is discontinuous. 9. The pavement marking of claim 7 wherein the cavity of at least a portion of the retroreflective elements is at least partially filled with the binder. 10. The pavement marking of claim 2 where the retroreflective elements comprise a shrunk film layer beneath the preformed sheeting. 11. The pavement marking of claim 1 wherein the retroreflective elements comprise a discreet interior layer comprising optical elements. 12. The pavement marking of claim 1 wherein the optical elements comprise glass microspheres, glass-ceramic microspheres, cube corner elements, and combinations thereof.