# US 10,479,082 B2 · Ink jet recording method and ink jet recording apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,082 B2 - Document ID: US10479082B2 - Status: Granted - Kind: B2 - Application number: 16/027,506 - Filed: 2018-07-05 - Published: 2019-01-10 - Granted: 2019-11-19 - Earliest claimed: 2017-07-07 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Kouhei Nakagawa; Arihiro Saito; Takashi Saito - Web page: https://patentgrep.com/patent/US10479082B2 ## CPC - B41J 2/155: for line printing - B41J 2/14016: {Structure of bubble jet print heads} - B41J 2/1404: {Geometrical characteristics} - B41J 2/14201: {Structure of print heads with piezoelectric elements} - B41J 2/175: Ink supply systems {; Circuit parts therefor} - B41J 2/18: Ink recirculation systems - C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds - C09D 11/322: Pigment inks - B41J 2002/14403: {including a filter} - B41J 2202/11: characterised by specific geometrical characteristics - B41J 2202/12: with ink circulating through the whole print head - B41J 2202/20: Modules - B41J 2202/21: Line printing - C09D 11/324: containing carbon black - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - 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 An ink jet recording method capable of recording a high-quality image in which occurrence of fine unevenness is decreased. The ink jet recording method includes recording an image by ejecting ink from a recording head including an ejection orifice for ejecting the ink, an ejection element generating energy for ejecting the ink, and first and second flow paths that communicate between the ejection orifice and the ejection element and in which the ink flows. The ink jet recording method includes an ejection step of ejecting the ink from the ejection orifice, and a flow step of flowing the ink from the first flow path to the second flow path separately from the ejection step. The ink is an aqueous ink having a dynamic surface tension of 35 mN/m or more to 48 mN/m or less at 10 milliseconds. ## Claims ### Claim 1 An ink jet recording method for recording an image by ejecting ink from a recording head including (i) an ejection orifice for ejecting the ink, (ii) an ejection element generating energy for ejecting the ink, and (iii) first and second flow paths that communicate between the ejection orifice and the ejection element and in which the ink flows, the ink jet recording method comprising: an ejection step of ejecting the ink from the ejection orifice; and a flow step of flowing the ink from the first flow path to the second flow path separately from the ejection step, wherein the ink is an aqueous ink having a dynamic surface tension of 35 mN/m or more to 48 mN/m or less at 10 milliseconds. ### Claim 2 (depends on 1) The ink jet recording method according to claim 1, wherein a viscosity of the ink is 3.0 mPa·s or more. ### Claim 3 (depends on 1) The ink jet recording method according to claim 1, wherein the ink comprises a resin particle. ### Claim 4 (depends on 1) The ink jet recording method according to claim 1, wherein the ink comprises a water-soluble urethane resin. ### Claim 5 (depends on 1) The ink jet recording method according to claim 1, wherein the ink comprises a block copolymer. ### Claim 6 (depends on 1) The ink jet recording method according to claim 1, wherein the ink comprises a polyhydric alcohol derivative in which X mole(s) of ethylene oxide group(s) and Y mole(s) of propylene oxide group(s) are added to a polyhydric alcohol having three or more hydroxy groups and a proportion of {Y/(X+Y)}×100(%) is 70% or more to 90% or less. ### Claim 7 (depends on 1) The ink jet recording method according to claim 1, wherein the ink comprises a surfactant. ### Claim 8 (depends on 7) The ink jet recording method according to claim 7, wherein the surfactant comprises a compound represented by the following General Formula (1): wherein, in General Formula (1), x and y are each the number of added ethylene oxide groups. ### Claim 9 (depends on 1) The ink jet recording method according to claim 1, wherein the recording head comprises a plurality of ejection orifices, a plurality of first flow paths, and a plurality of second flow paths, wherein each of the plurality of the first flow paths communicates with an inlet path, and wherein each of the plurality of the second flow paths communicates with an outlet path. ### Claim 10 (depends on 1) The ink jet recording method according to claim 1, wherein the flow step comprises flowing the ink from the first flow path to the second flow path without discharging the ink from the ejection orifice. ### Claim 11 (depends on 1) The ink jet recording method according to claim 1, further comprising a recovery step of the recording head, wherein, during the recovery step, the flow step is stopped. ### Claim 12 (depends on 1) The ink jet recording method according to claim 1, wherein, in the flow step, the ink flows in a direction that crosses the ink-ejecting direction. ### Claim 13 (depends on 1) The ink jet recording method according to claim 1, wherein the flow step comprises flowing the ink from the first flow path to the second flow path by a flowing unit separate from the ejection element. ### Claim 14 (depends on 1) The ink jet recording method according to claim 1, wherein the flow step comprises flowing the ink from the first flow path to the second flow path by a pressure difference. ### Claim 15 (depends on 14) The ink jet recording method according to claim 14, wherein a flow rate (mm/s) of the ink is 0.1 mm/s or more to 10.0 mm/s or less. ### Claim 16 (depends on 1) The ink jet recording method according to claim 1, wherein the flow step comprises flowing the ink intermittently from the first flow path to the second flow path. ### Claim 17 (depends on 16) The ink jet recording method according to claim 16, wherein a flow rate (mm/s) of the ink is 1.0 mm/s or more to 10.0 mm/s or less. ### Claim 18 (depends on 1) The ink jet recording method according to claim 1, wherein the recording head is a line head. ### Claim 19 (depends on 18) The ink jet recording method according to claim 18, wherein the line head has a plurality of ejection element substrates arranged in a linear shape. ### Claim 20 An ink jet recording apparatus comprising: a recording head including an ejection orifice for ejecting the ink, (ii) an ejection element generating energy for ejecting the ink, and (iii) first and second flow paths that communicate between the ejection orifice and the ejection element and in which the ink flows; and a flowing unit for flowing the ink from the first flow path to the second flow path separately from the ejection element, wherein the ink is an aqueous ink having a dynamic surface tension of 35 mN/m or more to 48 mN/m or less at 10 milliseconds.