Solvent resistant printable substrates and their methods of manufacture and use
View Patent ↗A printable substrate, along with methods of its formation, is generally provided. The printable coating can include a base sheet defining a first surface and a second surface and a printable coating on the first surface of the base sheet. The base sheet can be constructed from a cellulosic nonwoven web and a saturant. The printable coating can include a plurality of inorganic microparticles and a crosslinked material, where the crosslinked material is formed from a crosslinkable polymeric binder and a crosslinking agent. An image can be formed on the printable substrate, such as by printing an ink composition onto the printable substrate (e.g., onto the printable coating).
1. A printable substrate, comprising:
a base sheet defining a first surface and a second surface, wherein the base sheet comprises a cellulosic nonwoven web and a saturant;
a printable coating on the first surface of the base sheet, wherein the printable coating comprises a plurality of inorganic microparticles and a crosslinked material, and wherein the crosslinked material is formed from a crosslinkable polymeric binder and a crosslinking agent, and further wherein the printable coating comprises about 60% by weight to about 80% by weight of the inorganic microparticles, about 25% by weight to about 35% by weight of the crosslinkable polymeric binder, and about 0.01% by weight to about 1% by weight of the crosslinking agent, and
wherein the plurality of inorganic microparticles comprises a mixture of a first plurality of first inorganic microparticles having a first average diameter and a second plurality of second inorganic microparticles having a second average diameter, wherein the first average diameter is smaller than the second average diameter.
2. The printable substrate as in claim 1 , wherein the printable coating is directly on the first surface of the base sheet.
3. The printable substrate as in claim 1 , wherein the cellulosic nonwoven web comprises about 25% to about 75% softwood fibers and about 25% to about 75% hardwood fibers.
4. The printable substrate as in claim 1 , wherein the cellulosic nonwoven web comprises about 40% to about 60% softwood fibers and about 40% to about 60% hardwood fibers.
5. The printable substrate as in claim 1 , wherein the saturant comprises a latex reinforcing polymer.
6. The printable substrate as in claim 5 , wherein the latex reinforcing polymer comprises an ethylene-vinyl acetate copolymer.
7. The printable substrate as in claim 6 , wherein the crosslinking agent comprises an epoxy crosslinking agent.
8. The printable substrate as in claim 5 , wherein the latex reinforcing polymer has a glass transition temperature of from about −40° C. to about 25° C.
9. The printable substrate as in claim 5 , wherein the saturant further comprises a filler material.
10. The printable substrate as in claim 9 , wherein the filler material comprises calcium carbonate.
11. The printable substrate as in claim 1 , wherein the inorganic microparticles comprise silicon dioxide microparticles.
12. The printable substrate as in claim 1 , wherein the inorganic microparticles have an average diameter of from about 4 μm to about 17 μm.
13. The printable substrate as in claim 1 , wherein the first average diameter is about 4 μm to about 10 μm, and wherein the second average diameter is about 10 μm to about 14 μm.
14. The printable substrate as in claim 1 , wherein the printable coating comprises about 65% by weight to about 75% by weight of the inorganic microparticles, about 17% by weight to about 25% by weight of the crosslinkable polymeric binder, and about 0.01% by weight to about 1% by weight of the crosslinking agent.
15. The printable substrate as in claim 1 , further comprising:
an ink composition applied to an external surface of the coated label substrate defined by the printable coating, wherein the ink composition defines an image on the external surface.
16. The printable substrate as in claim 15 , wherein the ink composition comprises an ink-jet ink.
17. The printable substrate as in claim 1 , further comprising:
an adhesive layer overlying the second surface of the base sheet.
18. A method of forming an image on a printable substrate, the method comprising:
printing an ink composition onto the printable substrate of claim 1 .
19. The printable substrate as in claim 1 , wherein the plurality of inorganic microparticles comprises a higher weight percent of the first plurality of first inorganic microparticles than the second plurality of second inorganic microparticles 19 b .
20. The printable substrate as in claim 1 , wherein the printable coating further comprises a cationic polyelectrolyte.
21. The printable substrate as in claim 1 , wherein the printable coating further comprises about 1% by weight to about 5% by weight of a cationic polyelectrolyte.
22. The printable substrate as in claim 1 , wherein the printable coating is substantially free from a crosslinking catalyst.