Energy cured coating
View Patent ↗An energy cured coating is described that may be used in numerous applications. In one embodiment, for instance, the coating can be used as a seal coat layer in a gaming card. In particular, the coating can be used to protect a hidden printed layer that is covered by a scratch-off material. In accordance with the present disclosure, the cured coating contains at least one monomer or oligomer in combination with a reactive plasticizer. The plasticizer may comprise one or more benzoates.
1. A gaming card comprising:
a substrate;
a print layer comprising printed indicia;
a flexible seal coat layer covering the printed layer, the seal coat layer comprising an energy cured coating containing at least one crosslinked monomer or oligomer and a plasticizer, the plasticizer comprising an alkylene glycol benzoate, wherein the plasticizer is present in the seal coat layer in an amount from about 1% to about 40% by weight; and
wherein the seal coat layer further comprises a reactive diluent comprising tripropylene glycol diacrylate, an ethoxylated trimethyl propylene triacrylate, or mixtures thereof; and
an opaque scratch-off layer covering the seal coat layer.
2. A gaming card as defined in claim 1 , wherein the plasticizer comprises a dipropylene glycol benzoate or a diethylene glycol benzoate.
3. A gaming card as defined in claim 1 , wherein the plasticizer comprises a mixture of a dipropylene glycol benzoate and a diethylene glycol benzoate.
4. A gaming card as defined in claim 1 , wherein the plasticizer is present in the seal coat layer in an amount from about 10% to about 40% by weight.
5. A gaming card as defined in claim 1 , wherein the plasticizer has reacted with the crosslinked monomer or oligomer within the seal coat layer.
6. A gaming card as defined in claim 1 , wherein the at least one crosslinked monomer or oligomer comprises bisphenol-A epoxy diacrylate.
7. A gaming card as defined in claim 1 , wherein the at least one crosslinked monomer or oligomer comprises bisphenol-A epoxy diacrylate, a polyester acrylate, a urethane acrylate, an aliphatic acrylate, an acrylated epoxy, or mixtures thereof.
8. A gaming card as defined in claim 1 , wherein the plasticizer is present in the seal coat layer in an amount from about 10% to about 40% by weight and wherein the total amount of crosslinked monomers or oligomers present in the seal coat layer is from about 15% to about 60% by weight and wherein the seal coat layer further comprises a reactive diluent in an amount from about 20% to about 70% by weight and a polymerization inhibitor.
9. A gaming card as defined in claim 8 , wherein the at least one crosslinked monomer or oligomer comprises bisphenol-A epoxy diacrylate, a polyester acrylate, a urethane acrylate, an aliphatic acrylate, an acrylated epoxy, or mixtures thereof, the reactive diluent comprises tripropylene glycol diacrylate, an ethoxylated trimethyl propylene triacrylate, or mixtures thereof, and the polymerization inhibitor comprises hydroquinone monomethyl ether.
10. A gaming card as defined in claim 1 , wherein the opaque scratch-off layer comprises a binder and metal particles.
11. A gaming card as defined in claim 1 , wherein the gaming card further comprises a primer coating positioned in between a top surface of the substrate and the printed layer, the gaming card further including a release coating positioned in between the seal coat layer and the opaque, scratch-off layer.
12. A gaming card as defined in claim 1 , wherein the gaming card includes a plurality of seal coat layers.
13. A gaming card as defined in claim 1 , wherein the seal coat Layer has been energy cured by exposing the coating to an electron beam.