# US 10,479,904 B2 · Ink set and recording apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,904 B2 - Document ID: US10479904B2 - Status: Granted - Kind: B2 - Application number: 15/982,473 - Filed: 2018-05-17 - Published: 2018-09-20 - Granted: 2019-11-19 - Earliest claimed: 2015-01-21 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Soichi Yamazaki - Web page: https://patentgrep.com/patent/US10479904B2 ## CPC - C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing - B41J 2/16508: {connected with the printer frame} - B41J 2/1652: {by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head} - B41J 2/16532: {by applying vacuum only} - B41J 2/16535: {using wiping constructions (B41J2/16552 takes precedence)} - B41J 2/16585: {for paper-width or non-reciprocating print heads} - B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)} - C09D 11/324: containing carbon black - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - 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) - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract Provided is an ink set including black ink and color ink, in which the black ink contains carbon black having a carboxyl group on a surface thereof, a resin particle having a carboxyl group on a surface thereof, betaine, an alkali ion, and water, the alkali ion contains a potassium ion, a sodium ion, and an organic alkali compound, and a content of the potassium ion is the largest among the alkali ions. ## Claims ### Claim 1 An ink set which is used for a recording apparatus including a printer head which is provided with 4000 or more ink jet discharging nozzles for each color comprising: black ink; and color ink, wherein the black ink contains carbon black having a carboxyl group on a surface thereof, a resin particle having a carboxyl group on a surface thereof, betaine, an alkali ion, and water, wherein the alkali ion contains a potassium ion, a sodium ion, and an organic alkali compound, wherein a content of the potassium ion is the largest among the alkali ions, and wherein the organic alkali compound contains at least one selected from the group consisting of triisopropanolamine, ammonia, hydrazine, methylamine, ethylamine, diethylamine, triethylamine, propylamine, dipropylamine, butylamine, diaminoethane, diaminopropane, diaminobutane, diaminopentane, diaminohexane, cyclohexylamine, aniline, tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl ammonium hydroxide, tetrabutyl ammonium hydroxide, benzyl trimethyl ammonium hydroxide, pyridine, N,N-dimethyl-4-aminopyridine, ammonium carbonate, ammonium hydrogen carbonate, and hydrogen phosphate diammonium. ### Claim 2 (depends on 1) The ink set according to claim 1, wherein in the black ink, the content of the potassium ion is in a range of 0.0010 mol/L to 0.20 mol/L, and a content of the sodium ion is in a range of 0.00010 mol/L to 0.10 mol/L. ### Claim 3 (depends on 1) The ink set according to claim 1, wherein the color ink contains a metal alkali ion, and wherein a content of the metal alkali ion is in a range of 0 mol/L to 0.10 mol/L. ### Claim 4 (depends on 1) The ink set according to claim 1, wherein the black ink contains at least one acid selected from the group consisting of an organic acid, a phosphoric acid compound, and a boric acid compound. ### Claim 5 (depends on 1) The ink set according to claim 1, which is used for the recording apparatus, the recording apparatus further comprising a wiping mechanism which wipes the ink jet discharging nozzles by using a wiping member. ### Claim 6 (depends on 5) The ink set according to claim 5, wherein the wiping mechanism is a mechanism for pressurizing and wiping the ink jet discharging nozzle by using the wiping member. ### Claim 7 (depends on 1) The ink set according to claim 1, wherein the betaine contains at least one selected from the group consisting of trimethyl glycine, dimethyl glycine, and glycine. ### Claim 8 (depends on 1) A recording apparatus comprising: a printer head which is provided with ink jet discharging nozzles; and a wiping mechanism which wipes the ink jet discharging nozzle by using a wiping member, wherein the ink set according to claim 1 is installed therein. ### Claim 9 (depends on 2) A recording apparatus comprising: a printer head which is provided with ink jet discharging nozzles; and a wiping mechanism which wipes the ink jet discharging nozzle by using a wiping member, wherein the ink set according to claim 2 is installed therein. ### Claim 10 (depends on 3) A recording apparatus comprising: a printer head which is provided with ink jet discharging nozzles; and a wiping mechanism which wipes the ink jet discharging nozzle by using a wiping member, wherein the ink set according to claim 3 is installed therein. ### Claim 11 (depends on 4) A recording apparatus comprising: a printer head which is provided with ink jet discharging nozzles; and a wiping mechanism which wipes the ink jet discharging nozzle by using a wiping member, wherein the ink set according to claim 4 is installed therein. ### Claim 12 (depends on 5) A recording apparatus comprising: a printer head which is provided with ink jet discharging nozzles; and a wiping mechanism which wipes the ink jet discharging nozzle by using a wiping member, wherein the ink set according to claim 5 is installed therein. ### Claim 13 (depends on 6) A recording apparatus comprising: a printer head which is provided with ink jet discharging nozzles; and a wiping mechanism which wipes the ink jet discharging nozzle by using a wiping member, wherein the ink set according to claim 6 is installed therein. ### Claim 14 (depends on 7) A recording apparatus comprising: a printer head which is provided with ink jet discharging nozzles; and a wiping mechanism which wipes the ink jet discharging nozzle by using a wiping member, wherein the ink set according to claim 7 is installed therein. ### Claim 15 (depends on 8) The recording apparatus according to claim 8, wherein the printer head is an oblique head. ### Claim 16 (depends on 1) The ink set according to claim 1, wherein the organic alkali compound contains triisopropanolamine. ### Claim 17 (depends on 1) The ink set according to claim 1, wherein in the black ink, the content of the potassium ion is in a range of 0.03 mol/L to 1.00 mol/L, and a content of the sodium ion is in a range of 0.00010 mol/L to 0.10 mol/L.