Multi-layered opaque thermally imaged label
View Patent ↗The thermal recording media of the present invention provides an intense image resistant to fade. Ideally there is provided a high Print Contrast Signal (PCS) image that greatly enhances reliable high-speed readability with a high percentage of accuracy in detecting the imaged areas when optical or electronic decoding devices and scanners are utilized. Uses include, but are not limited to security applications such as airline baggage tags, laminated durable labels for use in pathology, hematology, and general laboratory uses and on such applications as pre-stainer sample slides, ultraviolet thermal imaging durable labels, or durable labels for use on returnable totes or shipping containers. Generally, the thermal recording media of the present invention comprises: (a) a non-cavitated support material which incorporates a metal oxide layer on the first surface of the support material; and (b) either a direct thermal layer formed on the first surface of the metal oxide layer; or a ribbon to effect a thermal transfer of the desired image on to the first surface of the metal oxide layer.
1. A multi-layered opaque, laminated label able to be thermally imaged consisting of:
a) a support material having a first surface and second surface, wherein the support material is an opaque, non-cavitated polyester selected from the group consisting of polycarbonate, polyethylene terephthalate (PET) and blends thereof, and the first surface of the support material is coated with a non-stoichiometric aluminum oxide having a first surface;
b) an active direct thermal layer, having a first and second surface, overlying said first surface of the non-stoichiometric aluminum oxide layer, said active direct thermal layer having a chromogenic material for a color developing mechanism reactive to transmissions of heat through either the first or second surface of the active direct thermal layer for forming images within the active direct thermal layer;
c) a primer layer, having a first and second surface, wherein the second surface of the primer layer is applied to the first surface of the active direct thermal layer;
d) a direct thermal top coat, having a first and second surface, wherein the second surface is applied to the first surface of the primer layer;
e) one or more color coating layers, having a first and second surface, wherein the second surface is applied to the first surface of the direct thermal top coat layer;
f) a radiation-curable topcoat which is applied to the first surface of the color coating layer(s);
g) a chemically-resistant pressure-sensitive adhesive, having a first and second surface, which is applied to the second surface of the support material;
h) a silicone-coated release liner which is laminated to the second surface of the pressure-sensitive adhesive.
2. The multi-layered laminate construction of claim 1 wherein the image formed is readable in the near-infrared.