# US 11,028,280 B2 · Composition, cured product, composition stored container, image forming apparatus, and image forming method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,280 B2 - Document ID: US11028280B2 - Status: Granted - Kind: B2 - Application number: 16/355,756 - Filed: 2019-03-17 - Published: 2019-09-19 - Granted: 2021-06-08 - Earliest claimed: 2018-03-19 - Assignees: Ricoh Company, Ltd. - Applicants: Yuuki Matsushita - Inventors: Yuuki Matsushita - Web page: https://patentgrep.com/patent/US11028280B2 ## CPC - B41J 11/00214: {using UV radiation} - B29C 64/112: using individual droplets, e.g. from jetting heads - B33Y 70/00: Materials specially adapted for additive manufacturing - B41M 5/0023: {Digital printing methods characterised by the inks used (inks per se C09D11/00)} - 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 - C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds - C09D 11/107: from unsaturated acids or derivatives thereof - C09D 11/30: Inkjet printing inks - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - B33Y 80/00: Products made by additive manufacturing - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - 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) - 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 composition is provided including an acrylamide compound having an ester structure and a molecular weight of 150 to 200, and a polysilane as a polymerization initiator. ## Claims ### Claim 1 A composition comprising: an acrylamide compound having an ester structure and a molecular weight of 150 to 200; and a polysilane as a polymerization initiator, wherein the polysilane comprises the following structure (1) or (2): where n represents an integer of 2 to 100, and R represents a straight or branched alkyl group. ### Claim 2 (depends on 1) The composition according to claim 1, wherein acrylamide compound having an ester structure comprises a straight or branched alkyl ester group having 1 to 4 carbon atoms. ### Claim 3 (depends on 1) The composition according to claim 1, wherein the acrylamide compound having an ester structure is represented by the following general formula (1) or (2): CH2═CH—CO—N(R1)—R2—CO—O—R3 general formula (1) where R1 represents hydrogen atom or a straight or branched alkyl group having 1 to 4 carbon atoms, R2 represents a straight or branched alkylene group having 1 to 4 carbon atoms, R3 represents a straight or branched alkyl group having 1 to 4 carbon atoms, and a total number of carbon atoms in R1, R2, and R3 is 2 to 6; where a ring X represents a ring structure having 2 to 5 carbon atoms and a nitrogen atom, R4 represents a single bond or a straight or branched alkylene group having 1 to 3 carbon atoms, and R5 represents a straight or branched alkyl group having 1 to 3 carbon atoms, and a total number of carbon atoms in the ring X, R4, and R5 is 3 to 6. ### Claim 4 (depends on 3) The composition according to claim 3, wherein the acrylamide compound having an ester structure is represented by general formula (1), and R3 represents an alkyl group having 1 to 2 carbon atoms. ### Claim 5 (depends on 1) The composition according to claim 1, wherein the polysilane has a weight average molecular weight of 500 to 100,000. ### Claim 6 (depends on 1) A cured product obtained by curing the composition according to claim 1. ### Claim 7 (depends on 1) A composition stored container comprising: a container; and the composition according to claim 1 stored in the container. ### Claim 8 (depends on 7) An image forming apparatus comprising: the composition stored container according to claim 7; a discharging device to discharge the composition contained in the container; and an irradiator to irradiate the discharged composition with an active energy ray. ### Claim 9 (depends on 1) An image forming method comprising: discharging the composition according to claim 1; and irradiating the discharged composition with an active energy ray to cure the composition.