# US 12,215,237 B2 · High opacity white ink > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,237 B2 - Document ID: US12215237B2 - Status: Granted - Kind: B2 - Application number: 18/707,956 - Filed: 2022-12-22 - Published: 2024-12-12 - Granted: 2025-02-04 - Earliest claimed: 2021-12-30 - Assignees: Sun Chemical Corporation - Applicants: Sun Chemical Corporation - Inventors: Jarol Osorio; Everett Garrish - Web page: https://patentgrep.com/patent/US12215237B2 ## CPC - C09D 11/104: Polyesters - B65D 65/42: Applications of coated or impregnated materials - C09D 11/033: characterised by the solvent - C09D 11/037: characterised by the pigment - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The high opacity solvent based white printing ink of claim 1 comprising 60-70%, by weight, of a TiO2 pigment based on the total weight of the ink composition. ### Claim 3 (depends on 1) The high opacity solvent based white printing ink of claim 1 comprising 55-65%, by weight, of a TiO2 pigment based on the total weight of the ink composition. ### Claim 4 (depends on 1) The high opacity solvent based white printing ink of claim 1 comprising greater than or equal to 60%, by weight, of a TiO2 pigment based on the total weight of the ink composition. ### Claim 5 (depends on 1) The high opacity solvent based white printing ink of claim 1 wherein the pigment to resin binder ratio is from 4:1 to 8:1 by weight. ### Claim 6 (depends on 1) The high opacity solvent based white printing ink of claim 1, wherein the solvent further comprises one or more acetate esters, ethers, glycols, glycol ethers, ketones or aldehydes. ### Claim 7 (depends on 1) The high opacity solvent based white printing ink of claim 1, wherein at least one alcohol soluble polyester resin is a soft polyester resin. ### Claim 8 (depends on 1) The high opacity solvent based white printing ink of claim 1, wherein the resin component further comprises a polyurethane resin. ### Claim 9 (depends on 8) The high opacity solvent based white printing ink of claim 8 wherein the polyurethane resin is an aliphatic polyether urethane resin. ### Claim 10 (depends on 1) The high opacity solvent based white printing ink of claim 1, wherein the printed and dried ink film exhibits a 5% or lower loss in opacity when over-coated with an adhesive or lacquer. ### Claim 11 (depends on 1) A method for providing a printed substrate, comprising printing one or more layers of the ink of claim 1 on a substrate and drying the one or more ink layers, wherein the printed and dried ink film exhibits a ≤10% loss in opacity after being overcoated with an adhesive or cold seal release lacquer. ### Claim 12 (depends on 11) The method of claim 11, wherein the printed and dried ink film exhibits a ≤5% loss in opacity after being overcoated with an adhesive or cold seal release lacquer. ### Claim 13 (depends on 11) The method of claim 11, wherein the substrate is a flexible film. ### Claim 14 (depends on 11) A printed substrate prepared by the method of claim 11. ### Claim 15 (depends on 11) The printed substrate of claim 11, wherein the printed substrate is a packaging structure. ### Claim 16 (depends on 15) The printed substrate of claim 15, wherein the packaging structure is a food packaging structure. ### Claim 17 (depends on 1) The high opacity solvent based white printing ink of claim 1, wherein the hydroxyl substituted polyester resin is Reactol™ 5145 A (gum rosin ester). ### Claim 18 (depends on 1) The high opacity solvent based white printing ink of claim 1 comprising 80-95%, by weight, of a TiO2 based on the total weight of the TiO2 pigment in the ink composition. ### Claim 19 (depends on 1) The high opacity solvent based white printing ink of claim 1, wherein the inks have a solid content of higher then 60% based on the total weight of the ink composition. ### Claim 20 (depends on 19) The high opacity solvent based white printing ink of claim 19, wherein the inks have a solid content of higher then 70% based on the total weight of the ink composition.