# US 2016/0257828 A1 · Photocationically curable ink jet ink, method of manufacturing photocationically curable ink jet ink, printed matter, and method of manufacturing printed matter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0257828 A1 - Document ID: US20160257828A1 - Status: Published application - Kind: A1 - Application number: 15/027,364 - Filed: 2014-10-02 - Published: 2016-09-08 - Earliest claimed: 2013-10-07 - Assignees: Tokyo Printing Ink Mfg. Co., Ltd. - Applicants: Tokyo Printing Ink Mfg. Co., Ltd. - Inventors: Shigenori KOBAYASHI; Fumitaka YAMAGUCHI - Web page: https://patentgrep.com/patent/US20160257828A1 ## 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 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds - C09D 11/322: Pigment inks - C09D 11/36: based on non-aqueous solvents - B41J 2/01: Ink jet - 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 A photocationically curable ink jet ink includes: a photoacid generator; a pigment; a monofunctional epoxy compound; a bifunctional epoxy compound; a monofunctional oxetane compound; and a bifunctional oxetane compound. In the photocationically curable ink jet ink, a concentration of the monofunctional epoxy compound is 20 wt % to 50 wt %, a concentration of the bifunctional epoxy compound is 20 wt % to 50 wt %, a concentration of the monofunctional oxetane compound is 5 wt % to 20 wt %, and a concentration of the bifunctional oxetane compound is 5 wt % to 20 wt %. ## Claims ### Claim 1 A photocationically curable ink jet ink comprising: a photoacid generator; a pigment; a monofunctional epoxy compound (excluding an organosiloxane having an epoxy group); a bifunctional epoxy compound; a monofunctional oxetane compound; and a bifunctional oxetane compound. ### Claim 2 (depends on 1) The photocationically curable ink jet ink according to claim 1, wherein a concentration of the monofunctional epoxy compound is 20 wt % to 50 wt %, a concentration of the bifunctional epoxy compound is 20 wt % to 50 wt %, a concentration of the monofunctional oxetane compound is 5 wt % to 20 wt %, and a concentration of the bifunctional oxetane compound is 5 wt % to 20 wt %. ### Claim 3 (depends on 1) The photocationically curable ink jet ink according to claim 1, wherein the monofunctional epoxy compound contains an alicyclic monoepoxide. ### Claim 4 (depends on 3) The photocationically curable ink jet ink according to claim 3, wherein the alicyclic monoepoxide contains a monocarboxylic acid ester of alicyclic monoepoxide. ### Claim 5 (depends on 3) The photocationically curable ink jet ink according to claim 3, wherein the alicyclic monoepoxide contains a higher alcohol diester of epoxyhexahydrophthalic acid. ### Claim 6 (depends on 3) The photocationically curable ink jet ink according to claim 3, wherein the alicyclic monoepoxide contains a monocarboxylic acid ester of alicyclic monoepoxide and a higher alcohol diester of epoxyhexahydrophthalic acid. ### Claim 7 (depends on 1) The photocationically curable ink jet ink according to claim 1, wherein the bifunctional epoxy compound contains an alicyclic bifunctional epoxy compound. ### Claim 8 (depends on 1) The photocationically curable ink jet ink according to claim 1, wherein the pigment contains an inorganic pigment. ### Claim 9 (depends on 1) The photocationically curable ink jet ink according to claim 1, wherein when left to stand at 45° C. for 3 days, a viscosity increase rate is 0% or higher and 9% or lower. ### Claim 10 (depends on 1) A method of manufacturing a photocationically curable ink jet ink, the photocationically curable ink jet ink being the photocationically curable ink jet ink according to claim 1, the method comprising: a mixing-dispersing step of mixing at least a portion of the pigment with at least a portion of another component to obtain a pigment dispersion; and a post-addition step of adding remaining components to the pigment dispersion. ### Claim 11 (depends on 10) The method of manufacturing a photocationically curable ink jet ink according to claim 10, wherein the bifunctional epoxy compound is added only in the post-addition step. ### Claim 12 (depends on 1) A method of manufacturing a printed matter, the method comprising: a step of adhering the photocationically curable ink jet ink according to claim 1 to a substrate; and a step of irradiating the adhered photocationically curable ink jet ink with energy rays to cure the photocationically curable ink jet ink. ### Claim 13 (depends on 12) A printed matter which is obtained using the method of manufacturing a printed matter according to claim 12. ### Claim 14 (depends on 13) The printed matter according to claim 13, wherein a maximum ink film thickness of the cured photocationically curable ink jet ink on the substrate is 10 μm or more and 30 μm or less. ### Claim 15 (depends on 4) The photocationically curable ink jet ink according to claim 4, wherein the bifunctional epoxy compound contains an alicyclic bifunctional epoxy compound. ### Claim 16 (depends on 5) The photocationically curable ink jet ink according to claim 5, wherein the bifunctional epoxy compound contains an alicyclic bifunctional epoxy compound. ### Claim 17 (depends on 6) The photocationically curable ink jet ink according to claim 6, wherein the bifunctional epoxy compound contains an alicyclic bifunctional epoxy compound. ### Claim 18 (depends on 4) The photocationically curable ink jet ink according to claim 4, wherein the pigment contains an inorganic pigment. ### Claim 19 (depends on 5) The photocationically curable ink jet ink according to claim 5, wherein the pigment contains an inorganic pigment. ### Claim 20 (depends on 6) The photocationically curable ink jet ink according to claim 6, wherein the pigment contains an inorganic pigment.