US 12,460,096 B2
Over-print varnish formulation
Alex Trubnikov, Netanya (IL); Mazi Bar, Netanya (IL); Eytan Cohen, Netanya (IL); Kfir Dar, Netanya (IL); and Kobi Cohen, Netanya (IL)
Assigned to Hewlett-Packard Development Company, L.P., Spring, TX (US)
Appl. No. 17/911,397
Filed by HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., Spring, TX (US)
PCT Filed Apr. 2, 2020, PCT No. PCT/US2020/026438
§ 371(c)(1), (2) Date Sep. 13, 2022,
PCT Pub. No. WO2021/201872, PCT Pub. Date Oct. 7, 2021.
Prior Publication US 2023/0104817 A1, Apr. 6, 2023
Int. Cl. C09D 11/30 (2014.01); B41M 5/00 (2006.01); B41M 7/00 (2006.01); B42D 15/00 (2006.01); C09D 11/033 (2014.01); C09D 11/102 (2014.01); C09D 11/106 (2014.01); C09D 11/12 (2006.01); C09D 11/38 (2014.01); C09D 11/40 (2014.01); C09D 11/54 (2014.01); C09D 175/04 (2006.01)
CPC C09D 11/30 (2013.01) [B41M 5/0017 (2013.01); B41M 7/0054 (2013.01); B42D 15/0093 (2013.01); C09D 11/033 (2013.01); C09D 11/102 (2013.01); C09D 11/106 (2013.01); C09D 11/12 (2013.01); C09D 11/38 (2013.01); C09D 11/40 (2013.01); C09D 11/54 (2013.01); C09D 175/04 (2013.01)] 14 Claims
 
1. An over-print varnish formulation, comprising:
a non-ionic polyurethane dispersion including a non-ionic polyurethane selected from the group consisting of an aromatic polyether polyurethane, an aliphatic polyether polyurethane, an aromatic polyester polyurethane, an aliphatic polyester polyurethane, an aromatic polycaprolactam polyurethane, an aliphatic polycaprolactam polyurethane, a vinyl-urethane hybrid polymer, an acrylic-urethane hybrid polymer, a co-polymer thereof, and a combination thereof;
a water-soluble polymer of Mw less than 55,000, wherein the water-soluble polymer is a cationic polymer selected from the group consisting of a quaternary amine, a polyguanidine cationic polymer, a water-soluble cationic dendrimer, a polyallylamine, a poly diallyl dimethyl ammonium chloride, or a polyvinyl pyrrolidone, and combinations thereof;
a wax having a particle size (d50) 200 nm or less; and
a water-soluble solvent,
wherein the formulation comprises at least 20 wt % solids, based on the total weight of the formulation.