Solvent resistant printable substrates and their methods of manufacture and use
View Patent ↗Printable substrates including a base sheet, a tie coating on a first surface of the base sheet, and a printable coating on the tie coating are generally provided. The tie coating can generally include a first crosslinked material formed from a film-forming binder, a first crosslinkable polymeric binder, a first crosslinking agent, and a first crosslinking catalyst. The printable coating can generally include a plurality of inorganic microparticies and a second crosslinked material formed from a second crosslinkable polymeric binder, a second crosslinking agent, and a second crosslinking catalyst. Methods of forming an image on such printable substrates are also generally provided, along with methods for forming such printable substrates.
1. A printable substrate comprising
a base sheet defining a first surface and a second surface;
a tie coating on the first surface of the base sheet, wherein the tie coating comprises first crosslinked material formed from a film-forming binder, a first crosslinkable polymeric binder, a first crosslinking agent, and a first crosslinking catalyst; and
a printable coating on the tie coating, wherein the printable coating comprises a plurality of inorganic microparticles and a second crosslinked material formed from a second crosslinkable polymeric binder, a second crosslinking agent, and a second crosslinking catalyst.
2. The printable substrate as in claim 1 , wherein the film-forming binder comprises an acrylic latex, the first polymeric binder comprises an ethylene acrylic polymer, the first crosslinking agent comprises an epoxy crosslinking agent, and the first crosslinking catalyst comprises an imidazole curing agent.
3. The printable substrate as in claim 1 , wherein the inorganic microparticles comprise silicon dioxide microparticles.
4. The printable substrate as in claim 1 , wherein the inorganic microparticles have an average diameter of from about 4 μm to about 17 μm.
5. The printable substrate as in claim 1 , wherein the printable coating comprises a first plurality of inorganic microparticles having a first average diameter and a second plurality of inorganic microparticles having a second average diameter, wherein the first average diameter is smaller than the second average diameter.
6. The printable substrate as in claim 5 , wherein the first average diameter is about 7 μm to about 11 μm, and wherein the second average diameter is about 11 μm to about 14 μm.
7. The printable substrate as in claim 1 , wherein the second crosslinkable polymeric binder comprises an ethylene acrylic polymer, the second crosslinking agent comprises an epoxy crosslinking agent, and the second crosslinking catalyst comprises an imidazole curing agent.
8. The printable substrate as claim 1 , wherein the tie coating comprises about 50% by weight to about 75% by weight of the film-forming binder, about 15% by weight to about 40% by weight of the first crosslinkable polymeric binder, about 5% by weight to about 15% by weight of the first crosslinking agent, and about 0.1% by weight to about 2% by weight of the first crosslinking catalyst.
9. The printable substrate as in claim 1 , wherein the printable coating comprises about 60% by weight to about 80% by weight of the inorganic microparticles, about 15% by weight to about 30% by weight of the second crosslinkable polymeric binder, about 1% by weight to about 10% by weight of the second crosslinking agent, and about 0.1% by weight to about 2% by weight of the second crosslinking catalyst.
10. The printable substrate as in claim 1 , wherein the printable coating further comprises a cationic polyelectrolyte.
11. The printable substrate as claim 10 , wherein the printable coating comprises about 1% by weight to about 5% by weight of the cationic polyelectrolyte.
12. The printable substrate as in claim 1 , wherein the tie coating has a basis weight of about 5 to about 10 g/m2, and wherein the printable coating has a basis weight of about 7 g/m2 to about 25 g/m2.
13. The printable substrate as in claim 1 , wherein the base sheet comprises a polymeric film.
14. The printable substrate as in claim 1 , further comprising an ink composition applied to an external surface of the coated label substrate formed by the printable coating, wherein the ink composition defines an image on the external surface.
15. The printable substrate as in claim 14 , wherein the ink composition comprises an ink-jet ink.
16. The printable substrate as in claim 1 , wherein the printable coating directly overlies the tie coating without any intermediate layer present between the printable coating and the tie coating, and wherein the tie coating directly overlies the first surface of the base sheet without any intermediate layer present between the tie coating and the first surface.
17. The printable substrate as in claim 1 , further comprising:
a connector configured to attach the printable substrate to a product for labeling.
18. The printable substrate as in claim 17 , wherein the connector is an adhesive layer overlying the second surface of the base sheet.
19. The printable substrate as in claim 1 , wherein the printable coating defines an external surface of the printable substrate.