# US 11,306,215 B2 · UV curable inkjet inks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,215 B2 - Document ID: US11306215B2 - Status: Granted - Kind: B2 - Application number: 16/086,359 - Filed: 2017-03-20 - Published: 2019-03-21 - Granted: 2022-04-19 - Earliest claimed: 2016-03-21 - Assignees: Agfa NV - Applicants: Agfa NV - Inventors: Stefaan De Meutter - Web page: https://patentgrep.com/patent/US11306215B2 ## CPC - C09D 11/101: Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing - C09D 11/322: Pigment inks - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing - C09D 11/324: containing carbon black - 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) ## Abstract A liquid UV curable inkjet ink includes one or more photoinitiators, an organic colour pigment, and a polymerizable composition containing at least one monofunctional polymerizable compound and at least one polyfunctional polymerizable compound, wherein the organic colour pigment is present in an amount of 6.0 to 13.0 wt % based on the total weight of the liquid UV curable inkjet ink; the at least one polyfunctional polymerizable compound is present in an amount of at least 20.0 wt % based on the total weight of the polymerizable composition; and the UV curable inkjet ink has a viscosity at 45° C. and a shear rate of 10 s−1 of at least 16.0 mPa.s. ## Claims ### Claim 1 A liquid UV curable inkjet ink comprising: one or more photoinitiators in an amount of at least 7.0 wt % relative to a total weight of the liquid UV curable inkjet ink; an organic color pigment; and a polymerizable composition in an amount less than 75 wt % relative to the total weight of the liquid UV curable inkjet ink and including at least one monofunctional polymerizable compound and at least one polyfunctional polymerizable compound; wherein the organic color pigment is present in an amount of 6.0 to 13.0 wt % based on the total weight of the liquid UV curable inkjet ink; the at least one polyfunctional polymerizable compound is present in an amount of 20.0 wt % to 50.0 wt % based on a total weight of the polymerizable composition; the liquid UV curable inkjet ink has a viscosity at 45° C. and a shear rate of 10 s−1 of at least 16.0 mPa.s; and the liquid UV curable inkjet ink has a viscosity at 25° C. and a shear rate of 10 s−1 of at least 40.0 mPa.s. ### Claim 2 (depends on 1) The liquid UV curable inkjet ink according to claim 1, wherein the at least one polyfunctional polymerizable compound is present in an amount of 25.0 to 50.0 wt % based on the total weight of the polymerizable composition. ### Claim 3 (depends on 1) The liquid UV curable inkjet ink according to claim 1, wherein at least one of the one or more photoinitiators is selected from the group consisting of a polymeric photoinitiator, a polymerizable photoinitiator, and a photoinitiator including a plurality of photoinitiating groups. ### Claim 4 (depends on 1) The liquid UV curable inkjet ink according to claim 1, wherein the polymerizable composition is present in amount less than 70.0 wt % based on the total weight of the liquid UV curable inkjet ink. ### Claim 5 (depends on 1) The liquid UV curable inkjet ink according to claim 1, further comprising 0 to 10 wt % of an organic solvent based on the total weight of the liquid UV curable inkjet ink. ### Claim 6 (depends on 1) The liquid UV curable inkjet ink according to claim 1, wherein the viscosity is from 20.0 to 65.0 mPa.s at 45° C. and a shear rate of 10 s−1. ### Claim 7 (depends on 1) The liquid UV curable inkjet ink according to claim 1, wherein the one or more photoinitiators includes an acylphosphine oxide photoinitiator and a thioxanthone photoinitiator. ### Claim 8 (depends on 1) A UV curable inkjet ink set for printing different colors comprising: at least one liquid UV curable inkjet ink according to claim 1. ### Claim 9 (depends on 8) The UV curable inkjet ink set according to claim 8, wherein the UV curable inkjet ink set includes at least three liquid UV curable color inkjet inks, each including one or more different organic color pigments present in an amount of 6.0 to 13.0 wt % based on the total weight of the liquid UV curable color inkjet ink. ### Claim 10 (depends on 8) The UV curable inkjet ink set according to claim 8, further comprising: a liquid UV curable white inkjet ink including a titanium dioxide pigment having an average particle size larger than 180 nm. ### Claim 11 (depends on 8) The UV curable inkjet ink set according to claim 8, further comprising: a liquid UV curable black ink including a carbon black pigment and a β-copper phthalocyanine pigment having an average particle size smaller than 200 nm. ### Claim 12 (depends on 1) A UV curable inkjet printing method comprising the steps of: jetting at least one liquid UV curable inkjet ink according to claim 1 onto a substrate with a print head at a jetting temperature of 45° C. or more; and UV curing the at least one liquid UV curable inkjet ink jetted on the substrate. ### Claim 13 (depends on 12) The UV curable inkjet printing method according to claim 12, wherein the substrate is pre-treated by a corona, a plasma, or a flame treatment. ### Claim 14 (depends on 12) The UV curable inkjet printing method according to claim 12, wherein the print head is a through-flow piezoelectric drop-on-demand print head. ### Claim 15 (depends on 12) The UV curable inkjet printing method according to claim 12, wherein the at least one liquid UV curable inkjet ink is jetted at a temperature between 45° C. and 65° C.