US 12,215,237 B2
High opacity white ink
Jarol Osorio, Charlotte, NC (US); and Everett Garrish, Charlotte, NC (US)
Assigned to Sun Chemical Corporation, Parsippany, NJ (US)
Appl. No. 18/707,956
Filed by Sun Chemical Corporation, Parsippany, NJ (US)
PCT Filed Dec. 22, 2022, PCT No. PCT/US2022/053803
§ 371(c)(1), (2) Date May 7, 2024,
PCT Pub. No. WO2023/129472, PCT Pub. Date Jul. 6, 2023.
Claims priority of provisional application 63/295,146, filed on Dec. 30, 2021.
Prior Publication US 2024/0409760 A1, Dec. 12, 2024
Int. Cl. C09D 11/104 (2014.01); B65D 65/42 (2006.01); C09D 11/033 (2014.01); C09D 11/037 (2014.01)
CPC C09D 11/104 (2013.01) [B65D 65/42 (2013.01); C09D 11/033 (2013.01); C09D 11/037 (2013.01)] 20 Claims
 
1. A high opacity solvent based white printing ink composition comprising:
5 to 15% by weight based on the total weight of the ink composition, of a resin binder component, wherein the resin binder component comprises one or more alcohol soluble polyester resins, wherein at least one alcohol soluble polyester resin is substituted by hydroxyl, and wherein the hydroxyl substituted polyester resin comprises at least 5% by weight based on the total weight of the ink composition;
more than 55% by weight based on the total weight of the ink composition, of a TiO2 pigment; and
one or more alcohol solvents;
wherein the ink has an un-reduced viscosity of from 15-100 centipoise, or 15 seconds #2 EZ Zahn cup to 35 seconds #2 EZ Zahn, and a reduced print viscosity of from about 10-80 cps, or 15 seconds #2 EZ Zahn to 35 seconds #2 EZ Zahn Cup;
wherein the ink is suitable for flexographic or gravure printing; and
characterized in that when the ink is printed and dried, it forms an ink film that exhibits a 10% or lower loss in opacity when the ink film is over-coated with an adhesive or lacquer.