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US 12,351,726 B2Granted
Thermally curable primers for digital printing
AssigneeSun Chemical Corporation
InventorsJoanne Guite, Harvey Harpham
Life of this patent
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Abstract
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.
Claims4
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.
3 more elements
Dependencies are inferred from the claim text.