	US 12,351,726 B2
	Thermally curable primers for digital printing
Joanne Guite, Newhey Rochdale (GB); and Harvey Harpham, Newhey Rochdale (GB)
Assigned to Sun Chemical B.V., Weesp (NL)
Appl. No. 18/565,052
Filed by SUN CHEMICAL CORPORATION, Parsippany, NJ (US)
PCT Filed Oct. 7, 2022, PCT No. PCT/GB2022/052553 § 371(c)(1), (2) Date Nov. 28, 2023, PCT Pub. No. WO2023/057775, PCT Pub. Date Apr. 13, 2023.
Claims priority of provisional application 63/253,184, filed on Oct. 7, 2021.
Prior Publication US 2024/0254359 A1, Aug. 1, 2024
Int. Cl. C09D 11/54 (2014.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01); B32B 37/06 (2006.01); B32B 38/00 (2006.01); B41M 3/00 (2006.01); B41M 5/00 (2006.01); B41M 7/00 (2006.01); C08J 7/04 (2020.01); C08J 7/043 (2020.01); C09D 11/023 (2014.01); C09D 11/037 (2014.01); C09D 11/102 (2014.01); C09D 11/107 (2014.01)

CPC C09D 11/54 (2013.01) [B32B 27/08 (2013.01); B32B 27/304 (2013.01); B32B 37/06 (2013.01); B32B 38/145 (2013.01); B41M 3/008 (2013.01); B41M 5/0064 (2013.01); B41M 7/009 (2013.01); C08J 7/042 (2013.01); C08J 7/043 (2020.01); C09D 11/023 (2013.01); C09D 11/037 (2013.01); C09D 11/102 (2013.01); C09D 11/107 (2013.01); B32B 2250/246 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2255/28 (2013.01); B32B 2309/02 (2013.01); B32B 2327/06 (2013.01); B32B 2425/00 (2013.01); C08J 2423/08 (2013.01); C08J 2433/02 (2013.01); C08J 2475/04 (2013.01)]

4 Claims

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.