# US 2020/0399492 A1 · Inkjet inks for manufacturing printed circuit boards > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399492 A1 - Document ID: US20200399492A1 - Status: Published application - Kind: A1 - Application number: 16/977,604 - Filed: 2019-02-28 - Published: 2020-12-24 - Earliest claimed: 2018-03-02 - Assignees: Agfa-Gevaert - Applicants: Agfa-Gevaert NV - Inventors: Johan Loccufier; Rita Torfs - Web page: https://patentgrep.com/patent/US20200399492A1 ## CPC - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - B41M 3/006: {Patterns of chemical products used for a specific purpose, e.g. pesticides, perfumes, adhesive patterns; use of microencapsulated material; Printing on smoking articles} - B41M 7/0081: {using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams} - 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 - H05K 3/125: {by ink-jet printing} - H05K 3/1283: {After-treatment of the printed patterns, e.g. sintering or curing methods} - H05K 2203/013: Inkjet printing, e.g. for printing insulating material or resist - 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) - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A radiation curable inkjet ink including an adhesion promoter according to Formula (I), wherein X is selected from the group consisting of O and NR3, L represents a divalent linking group comprising from 1 to 20 carbon atoms, R1 is selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group and a substituted or unsubstituted aryl group, R2 is selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted araikyl group and a substituted or unsubstituted (hetero)aryl group, R3 is selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted (hetero)aryl group, R2 and L may represent the necessary atoms to form a five to eight membered ring. ## Claims ### Claim at position 1 1-15. (canceled) ### Claim 16 A radiation curable inkjet ink comprising an adhesion promoter according to Formula I, wherein X is selected from the group consisting of O and NR3, L is a divalent linking group comprising from 1 to 20 carbon atoms, R1 is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group and a substituted or unsubstituted aryl group, R2 is selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted (hetero)aryl group, R3 is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted (hetero)aryl group, and R2 and L optionally represent the necessary atoms to form a five to eight membered ring. ### Claim 17 (depends on 16) The radiation curable inkjet ink according to claim 16 wherein X is O. ### Claim 18 (depends on 16) The radiation curable inkjet ink according to claim 16 wherein R1 is hydrogen or a methyl group. ### Claim 19 (depends on 16) The radiation curable inkjet ink according to claim 16 wherein the substituted or unsubstituted alkyl group, the substituted or unsubstituted alkenyl group, the substituted or unsubstituted alkynyl group, the substituted or unsubstituted alkaryl group, the substituted or unsubstituted aralkyl group, or the substituted or unsubstituted (hetero)aryl group comprises at least one polymerizable group selected from the group consisting of an acrylate, a methacrylate, an acrylamide and a methacrylamide. ### Claim 20 (depends on 16) The radiation curable inkjet ink according to claim 16 wherein the amount of adhesion promotor is between 0.5 and 15 wt % relative to the total weight of the radiation curable inkjet ink. ### Claim 21 (depends on 16) The radiation curable inkjet ink according to claim 16 further comprising a polymerizable compound having a pKa of at least 2.5. ### Claim 22 (depends on 21) The radiation curable inkjet ink according to claim 21 wherein the polymerizable compound is a phenolic monomer. ### Claim 23 (depends on 22) The radiation curable inkjet ink according to claim 22 wherein the phenolic monomer is selected from the group consisting of a phenolic acrylate, a phenolic methacrylate, a phenolic acrylamide and a phenolic methacrylamide. ### Claim 24 (depends on 16) A method of manufacturing a Printed Circuit Board (PCB) wherein an inkjet printing step is used, characterized in that in the inkjet printing step a radiation curable inkjet ink as defined in claim 16 is jetted and cured on a substrate. ### Claim 25 (depends on 24) The method according to claim 24 wherein curing is carried out using UV radiation. ### Claim 26 (depends on 24) The method according to claim 24 wherein a solder mask is provided on a dielectric substrate containing an electrically conductive pattern in the inkjet printing step. ### Claim 27 (depends on 26) The method according to claim 26 also comprising a heating step. ### Claim 28 (depends on 24) The method according to according to claim 24 wherein an etch resist is provided on a metal surface in the inkjet printing step. ### Claim 29 (depends on 28) The method according to claim 28 wherein the metal surface is a copper surface. ### Claim 30 (depends on 21, 28) The method according to claim 28 wherein a radiation curable inkjet ink as defined in claim 21 used.