Thermally curable primers for digital printing
Aqueous print receptive primers comprising a crosslinking agent which are cured at temperatures above 80° C. after being overprinted via electrographic (toner) or inkjet digital printing processes.
1. A method for preparing a digitally printed laminate, comprising the steps of:
a. applying an aqueous primer coating comprising a polyurethane dispersion and a thermally activated blocked isocyanate crosslinking agent, wherein the polyurethane dispersion forms greater than 40% (w/w) of the total composition and where the polyurethane forms, on dry weight, between 10.0 and 98% of the coating composition, onto a first substrate;
b. drying the primer;
c. overprinting the primed substrate with one or more digital ink(s);
d. drying the one or more digital ink(s); and
e. laminating a second substrate to the primed and printed first substrate at ≥80° C. to produce a laminated structure.
2. The method of claim 1 , wherein the laminating is performed at ≥100° C.
3. A laminate structure prepared by the method of claim 1 .
4. The laminate structure according to claim 3 which is a payment card.