Retroreflective articles having composite cube-corners and methods of making

摘要

Retroreflective articles and methods of making the same, wherein the retroreflective articles (10) include composite cube-corner elements (12) having a first light transmissive polymeric layer (30), a second light transmissive polymeric layer (32), and an interface therebetween, wherein the first light transmissive polymeric layer has a first index of refraction, the second light transmissive polymeric layer has a second index of refraction, and the first and second indices of refraction have an absolute difference of at least 0.0002.

主权项

1. A retroreflective article comprising:
a light transmissive support layer having generally opposed first and second major surfaces; and an array of composite cube-corner elements secured to the first major surface of the light transmissive support layer, wherein each composite cube-corner element comprises an apex and a base opposite the apex, and wherein each composite cube-corner element comprises a first light transmissive polymeric layer, a second light transmissive polymeric layer, and an interface therebetween; wherein the first light transmissive polymeric layer comprises the apex, and the second light transmissive polymeric layer comprises at least a portion of the base, wherein the first light transmissive polymeric layer has a first index of refraction, wherein the second light transmissive polymeric layer has a second index of refraction, wherein the first and second indices of refraction have an absolute difference of at least 0.0002, wherein the first light transmissive polymeric layer and the second light transmissive polymeric layer in the composite cube-corner elements are configured to divert retroreflected light to higher observation angles than in monolithic cube-corner elements of comparable geometry and materials, and wherein each of the composite cube-corner elements comprises up to 95% by volume of the second light transmissive polymeric layer.