UV-curing glass printing ink and UV-curing glass printing lacquer and process for printing glass substrates
A glass printing ink and glass printing lacquer are prepared, which contain at least one photoinitiator, at least one resin and at least one additional substance. The resin is an epoxy resin based on bisphenol A, diluted in a UV-curing monomer, or a resin with functional groups containing free functional amino, hydroxy, epoxy, acid, acid anhydride and/or acrylate groups, or a combination of the epoxy resin with the resin with functional groups. The at least one additional substance is a wax. The use of the glass printing ink and glass printing lacquer in printing a glass substrate and processes for the printing of a glass substrate are also described.
1. A glass printing ink or glass printing lacquer comprising:
at least one unmodified epoxy resin based on bisphenol A diluted in a UV-curing monomer,
at least one photoinitiator wherein the at least one photoinitiator only comprises one or more radical initiators, and
at least one additional substance,
wherein the UV-curing monomer is a radically UV-curing monomer and,
the at least one additional substance is a wax, and,
wherein the bisphenol-A based epoxy resin is combined with a resin having functional groups including one or more of the following functional groups: free functional amino, hydroxy, epoxy, acid, acid anhydride and acrylate groups, and,
wherein the resin with functional groups is a melamine acrylate, an acid-modified polyester acrylate, epoxy acrylate, or any combination thereof.
2. The glass printing ink or glass printing lacquer according to claim 1 , wherein the wax includes at least one of the following: polyethylene wax, modified polyethylene wax, high density polyethylene wax, polymer-silica composite, micronized polyolefin wax, Fischer-Tropsch wax, micronised polytetrafluoroethylene wax, micronized polytetrafluoroethylene/polyethylene wax, amide wax, carnauba wax, montan wax, micronized ester wax with UV-reactive groups, paraffin wax, polypropylene wax, and spray-micronised polyolefin wax.
3. The glass printing ink or glass printing lacquer according to claim 1 , wherein the wax is used in a quantity of substantially 0.1 wt. % to 10.0 wt. % dry weight, based on the weight of the glass printing ink or glass printing lacquer.
4. The glass printing ink or glass printing lacquer according to claim 3 , wherein the wax is used in a quantity of substantially 0.5 wt. % to 5.0 wt. % dry weight, based on the weight of the glass printing ink or glass printing lacquer.
5. The glass printing ink or glass printing lacquer according to claim 4 , wherein the wax is used in a quantity of substantially 1.0 wt. % to 3.0 wt. % dry weight, based on the weight of the glass printing ink or glass printing lacquer.
6. The glass printing ink or glass printing lacquer according to claim 1 , wherein the wax is dispersed in the glass printing ink or glass printing lacquer.
7. The glass printing ink or glass printing lacquer according to claim 1 , wherein the bisphenol A-based epoxy resin has a weight-average molecular weight in the range of substantially 700 to 1500.
8. The glass printing ink or glass printing lacquer according to claim 1 , wherein the at least one photoinitiator is present in a total quantity of substantially 1 to 12 wt. %. based on the weight of the glass printing ink or glass printing lacquer.
9. The glass printing ink or glass printing lacquer according to claim 1 , wherein the radically UV-curing monomer is hexanediol diacrylate.
10. The glass printing ink or glass printing lacquer according to claim 1 , further comprising a stabiliser.
11. The glass printing ink or glass printing lacquer according to claim 1 , further comprising a co-initiator.
12. The glass printing ink or glass printing lacquer according to claim 1 , further comprising one or more pigments or dyes in a quantity of substantially 0.5 to 50 wt. %, based on the total weight of the ink.