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US 12,215,237 B2Granted
High opacity white ink
AssigneeSun Chemical Corporation
InventorsJarol Osorio, Everett Garrish
Life of this patent
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Abstract
The present invention provides a high opacity solvent based white ink or coating composition that provides high levels of opacity to substrates used for packaging materials that are printed via flexography or gravure. The ink or coating composition contains up to 75 wt % titanium dioxide, while still having a viscosity suitable for flexographic and gravure printing methods.
Claims20
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.
5 more elements
Dependencies are inferred from the claim text.