Resin coated flexible substrates for printing high temperature resistant images
View Patent ↗Disclosed are resin coated flexible substrates, such as labels, including spine labels for CDs and DVDs which are adapted for thermal transfer printing, methods for preparing and printing on these resin coated flexible substrates and the printed substrates obtained therefrom. The printed substrates have images which are stable even when subjected to the heat and abrasion from a process which provides a shrink-wrap over the printed substrate.
1. A printed substrate comprising a) a flexible supporting layer with a b) resin coating positioned on at least one surface of said flexible supporting layer, said resin coating having a thickness of from 0.5 to 5.0 microns, and c) a printed image on said resin coating formed from a thermal transfer ribbon by a thermal transfer printing process, wherein said printed image comprises a blend of a thermal transfer ink from the thermal transfer ribbon and at least one resin within said resin coating.
2. A printed substrate as in claim 1 wherein the thermal transfer ink from the thermal transfer ribbon comprises at least 50% wax and the printed image on a surface with said resin coating comprise less than 50% wax.
3. A printed substrate as in claim 2 wherein the printed image on the surface has an increased resistance to abrasion and high temperatures as compared to the thermal transfer ink on the thermal transfer ribbon.
4. A printed substrate as in claim 2 wherein a major portion of said resin coating comprises a resin with a softening point below 150° C.
5. A printed substrate as in claim 4 which is a label that further comprises an adhesive layer on the surface of the flexible supporting layer opposite the resin coating.
6. A printed substrate as in claim 5 which is a spine label for a CD or DVD case.
7. A printed substrate as in claim 6 wherein the flexible supporting layer comprises a polyolefin resin and a major portion of the resin coating comprises an acrylic resin or polyurethane resin.
8. A printed substrate as in claim 5 which is a label applied to an article that is wrapped with shrink wrap and said shrink wrap is positioned over said label.
9. A label for the spine of a CD or DVD case comprising a flexible support layer coated with a pressure sensitive adhesive on one surface of said flexible support layer and a resin coating positioned on the surface of the flexible support layer opposite the pressure sensitive adhesive, wherein said resin coating has a thickness which ranges from 0.5 to 5.0 microns, and a major portion of said resin coating comprises a resin with a softening point below 150° C.
10. A label as in claim 9 wherein said resin coating is an overprint varnish.
11. A label as in claim 9 wherein a portion of the resin coating beneath an operating thermal print head of a thermal transfer printer will melt.
12. A label as in claim 9 additionally comprising a printed image on said resin coating formed from a thermal transfer ribbon by a thermal transfer printing process.
13. A label as in claim 12 wherein said printed image comprises a blend of the resin with said resin coating and the thermal transfer ink of said thermal transfer ribbon.
14. A label as in claim 12 which is applied to the spine of a CD or DVD case that is wrapped with shrink wrap wherein said shrink wrap is positioned over said label and the printed image is undisturbed by said shrink wrap.
15. A label as in claim 9 wherein the flexible support layer comprises a polyolefin resin and a major portion of the resin coating comprises an acrylic resin or polyurethane resin.
16. A label as in claim 9 which is applied to the spine of a CD or DVD case that is wrapped with shrink wrap wherein said shrink wrap is positioned over said label.
17. A method for printing an image on a resin coated substrate, wherein said resin coated substrate comprises a flexible supporting layer with a resin coating positioned on at least one surface of said flexible support layer,
said method comprising applying a thermal transfer ink from a thermal transfer ribbon to the resin coating, heating the thermal transfer ink to a temperature which softens or melts the thermal transfer ink and the resin coating beneath the thermal print head, maintaining the thermal transfer ink and resin coating molten for a period of which allows the thermal transfer ink to blend with the resin coating.
18. A method as in claim 17 wherein a thermal transfer ink with at least 50% wax is blended with the resin coating to form an image of less then 50% wax.
19. A method as in claim 17 wherein the resin coated substrate is prepared by coating a flexible polyolefin supporting substrate with an overprint varnish formulation comprised of a polyurethane resin or acrylic resin and drying said overprint varnish formulation to form a resin coating with a thickness in the range of 0.5 to 5.0 microns.
20. A method as in claim 17 wherein the flexible supporting layer does not melt when printing an image.