Sheet for license plate, laminate for license plate, and license plate

Abstract

A license plate sheet having superior weather resistance is provided. A license plate comprising the license plate sheet and having markings visible to a infrared-based ALPR system, is also provided. In some embodiments, the license plate sheet includes an infrared absorbing marking layer, wherein the infrared absorbing marking layer includes cesium tungsten oxide and a binder.

What is claimed is: 
     
         1 . A retroreflective article comprising:
 a retroreflective substrate having a light incident side, the retroreflective substrate including a plurality of retroreflective elements and a reflective layer; and   a marking layer comprising cesium tungsten oxide particles.   
     
     
         2 . The retroreflective article of  claim 1 , wherein the reflective layer includes one of a metallic layer, a seal film or an adhesive film comprising barrier materials. 
     
     
         3 . The retroreflective article of  claim 1 , wherein the marking layer further comprises a binder. 
     
     
         4 . The retroreflective article of  claim 1 , wherein the retroreflective elements include beads, cube corners or lenslets. 
     
     
         5 . The retroreflective article of  claim 1 , wherein the marking layer is disposed on at least a portion of the retroreflective substrate. 
     
     
         6 . The retroreflective article of  claim 1 , wherein the marking layer is disposed on the entire light incident side of the retroreflective substrate. 
     
     
         7 . The retroreflective article of  claim 1 , wherein the marking layer forms indicia. 
     
     
         8 . The retroreflective article of  claim 7 , wherein the marking layer forms one of a shape, a pattern or an alphanumeric character. 
     
     
         9 . The retroreflective article of  claim 1 , further comprising a printing layer disposed on at least a portion of the retroreflective substrate. 
     
     
         10 . The retroreflective article of  claim 9 , wherein the printing layer overlaps with the marking layer. 
     
     
         11 . The retroreflective article of  claim 9 , wherein the printing layer is visibly opaque and infrared transmissive. 
     
     
         12 . The retroreflective article of  claim 1 , wherein the marking layer is colorless or near colorless. 
     
     
         13 . A license plate comprising the retroreflective article of any of the preceding claims. 
     
     
         14 . A traffic sign comprising the retroreflective article of any of the preceding claims.