# US 2016/0355694 A1 · Method for manufacturing three-dimensional structure, three-dimensional structure manufacturing apparatus, ink set, and three-dimensional structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0355694 A1 - Document ID: US20160355694A1 - Status: Published application - Kind: A1 - Application number: 15/111,784 - Filed: 2015-01-14 - Published: 2016-12-08 - Earliest claimed: 2014-01-15 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Eiji OKAMOTO - Web page: https://patentgrep.com/patent/US20160355694A1 ## CPC - B29C 64/40: Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof - B29C 64/112: using individual droplets, e.g. from jetting heads - B29C 64/129: characterised by the energy source therefor, e.g. by global irradiation combined with a mask - B29C 64/188: involving additional operations performed on the added layers, e.g. smoothing, grinding or thickness control (surface shaping B29C59/00; after-treatment of articles without altering their shape B29C71/00) - B33Y 10/00: Processes of additive manufacturing - B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor - B33Y 70/00: Materials specially adapted for additive manufacturing - B33Y 80/00: Products made by additive manufacturing - C09D 5/008: {Temporary coatings (C09D5/20 takes precedence)} - C09D 11/107: from unsaturated acids or derivatives thereof - B29K 2105/0032: {Pigments, colouring agents or opacifiyng agents} - B29K 2995/0022: Bright, glossy or shiny surface - B29K 2995/0024: Matt surface - 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 - 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) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract In the method for manufacturing a three-dimensional structure of the invention, an ink for forming an entity portion is applied to a region where the three-dimensional structure is configured, and an ink for forming a sacrificial layer is applied to a region on a surface side of an outermost layer which is adjacent to a region to become the outermost. As the ink for forming a sacrificial layer, a first ink for forming a sacrificial layer and a second ink for forming a sacrificial layer are used. At the time of curing the ink for forming an entity portion, the viscoelasticity of the first ink is smaller than that of the ink for forming an entity portion, and at the time of curing the ink for forming an entity portion, the viscoelasticity of the second ink is greater than that of the ink for forming an entity portion. ## Claims ### Claim 1 A method for manufacturing a three-dimensional structure by stacking layers formed by discharging an ink including a curable resin and curing the layers, wherein an ink for forming an entity portion is applied to a region where the three-dimensional structure is configured, and an ink for forming a sacrificial layer for forming a sacrificial layer is applied to a region on a surface side of an outermost layer which is adjacent to a region to become the outermost layer of the three-dimensional structure, wherein a first ink for forming a sacrificial layer and a second ink for forming a sacrificial layer are used as the ink for forming a sacrificial layer, wherein the viscoelasticity of the first ink for forming a sacrificial layer at the time of curing the ink for forming an entity portion is smaller than the viscoelasticity of the ink for forming an entity portion at the time of curing the ink for forming an entity portion, and wherein the viscoelasticity of the second ink for forming a sacrificial layer at the time of curing the ink for forming an entity portion is greater than the viscoelasticity of the ink for forming an entity portion at the time of curing the ink for forming an entity portion. ### Claim 2 (depends on 1) The method for manufacturing a three-dimensional structure according to claim 1, comprising: a step of removing a sacrificial layer from a temporarily formed body obtained by curing the ink for forming an entity portion, the first ink for forming a sacrificial layer, and the second ink for forming a sacrificial layer. ### Claim 3 (depends on 1) The method for manufacturing a three-dimensional structure according to claim 1, wherein the first ink for forming a sacrificial layer includes one type or two or more types selected from the group consisting of tetrahydrofurfuryl (meth)acrylate, ethoxyethoxyethyl (meth)acrylate, polyethylene glycol di(meth)acrylate, and (meth)acryloyl morpholine. ### Claim 4 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein the second ink for forming a sacrificial layer includes 2-(2-vinyloxyethoxy)ethyl (meth)acrylate. ### Claim 5 (depends on 4) The method for manufacturing a three-dimensional structure according to claim 4, wherein the second ink for forming a sacrificial layer includes polyethylene glycol di(meth)acrylate in addition to 2-(2-vinyloxyethoxy)ethyl (meth)acrylate. ### Claim 6 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein the ink for forming an entity portion includes one type or two or more types selected from the group consisting of 2-(2-vinyloxyethoxy)ethyl (meth)acrylate, polyether-based aliphatic urethane (meth)acrylate oligomer, 2-hydroxy-3-phenoxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. ### Claim 7 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein all of the ink for forming an entity portion, the first ink for forming a sacrificial layer, and the second ink for forming a sacrificial layer include a polymerization initiator, and wherein the content of the polymerization initiator in the ink for forming an entity portion is greater than the content of the polymerization initiator in the first ink for forming a sacrificial layer and the content of the polymerization initiator in the second ink for forming a sacrificial layer. ### Claim 8 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein all of the ink for forming an entity portion, the first ink for forming a sacrificial layer, and the second ink for forming a sacrificial layer include bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide and/or 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide as the polymerization initiator. ### Claim 9 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein as the ink for forming an entity portion, in addition to a coloring ink containing a colorant, a colorless ink not containing a coloring agent is used, and wherein the colorless ink is used for forming a region to become the outermost surface, and the coloring ink is used for forming a region on the inner side than the region. ### Claim 10 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein the chromatic color ink and the white ink are used as the coloring ink containing a colorant, and wherein the white ink is used for forming a region on the inner side of a region formed by using the chromatic color ink. ### Claim 11 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein different plural types of the first ink for forming a sacrificial layer are used. ### Claim 12 (depends on 1) The method for manufacturing a three-dimensional structure according to any one of claim 1, wherein different plural types of the second ink for forming a sacrificial layer are used. ### Claim 13 A three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure by stacking layers formed by discharging an ink including a curable resin and curing the layers, comprising: entity portion forming ink discharge means for discharging an ink for forming an entity portion to a region where a three-dimensional structure is configured; sacrificial layer forming ink discharge means for discharging an ink for forming a sacrificial layer for forming a sacrificial layer to a region on a surface side of an outermost layer which is adjacent to a region to become the outermost layer of the three-dimensional structure; curing means for curing the ink for forming an entity portion and the ink for forming a sacrificial layer; and first sacrificial layer forming ink discharge means for discharging the first ink for forming a sacrificial layer and second sacrificial layer forming ink discharge means for discharging the second ink for forming a sacrificial layer as the sacrificial layer forming ink discharge means, wherein the viscoelasticity of the first ink for forming a sacrificial layer at the time of curing the ink for forming an entity portion is smaller than the viscoelasticity of the ink for forming an entity portion at the time of curing the ink for forming an entity portion, and wherein the viscoelasticity of the second ink for forming a sacrificial layer at the time of curing the ink for forming an entity portion is greater than the viscoelasticity of the ink for forming an entity portion at the time of curing the ink for forming an entity portion. ### Claim 14 An ink set used for manufacturing a three-dimensional structure by stacking layers formed by discharging an ink including a curable resin and curing the layers, comprising: an ink for forming an entity portion for applying to a region where the three-dimensional structure is configured; an ink for forming a sacrificial layer for forming a sacrificial layer in a region on a surface side of an outermost layer which is adjacent to a region to become the outermost layer of the three-dimensional structure; and a first ink for forming a sacrificial layer and a second ink for forming a sacrificial layer as the ink for forming a sacrificial layer, wherein the content of a polymerization initiator in the first ink for forming a sacrificial layer is smaller than the content of a polymerization initiator in the second ink for forming a sacrificial layer. ### Claim 15 (depends on 14) The ink set according to claim 14, wherein both the first ink for forming a sacrificial layer and the second ink for forming a sacrificial layer include bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and/or 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide as the polymerization initiator. ### Claim 16 An ink set used for manufacturing a three-dimensional structure by stacking layers formed by discharging an ink including a curable resin and curing the layers, comprising: an ink for forming an entity portion for applying to a region where the three-dimensional structure is configured; an ink for forming a sacrificial layer for forming a sacrificial layer in a region on a surface side of an outermost layer which is adjacent to a region to become the outermost layer of the three-dimensional structure; and a first ink for forming a sacrificial layer and a second ink for forming a sacrificial layer as the ink for forming a sacrificial layer, wherein the viscoelasticity of the first ink for forming a sacrificial layer at the time of curing the ink for forming an entity portion is smaller than the viscoelasticity of the ink for forming an entity portion at the time of curing the ink for forming an entity portion, and wherein the viscoelasticity of the second ink for forming a sacrificial layer at the time of curing the ink for forming an entity portion is greater than the viscoelasticity of the ink for forming an entity portion at the time of curing the ink for forming an entity portion. ### Claim 17 (depends on 1) A three-dimensional structure manufactured by using the method according to any one of claim 1. ### Claim 18 (depends on 17) A three-dimensional structure manufactured by using the three-dimensional structure manufacturing apparatus according to claim 17. ### Claim 19 (depends on 14) A three-dimensional structure manufactured by using the ink set according to any one of claim 14.