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公开(公告)号：EP3995229A1
公开(公告)日：2022-05-11
申请号：EP20834403.6
申请日：2020-07-06
申请人： Ricoh Company, Ltd.
IPC分类号： B22F1/02 , B22F3/02 , B22F3/16 , B33Y10/00 , B33Y30/00 , B29C64/165 , B29C64/314 , B33Y70/00
摘要： A three-dimensional object producing method including: forming a powder material layer with a powder material for three-dimensional object formation, where the powder material includes a base material and a resin including a reactive functional group; and applying a curing liquid to the powder material layer to form a cured product, where the curing liquid contains a curing agent capable of forming a covalent bond with the reactive functional group, wherein the curing agent includes an aliphatic compound having two or more isocyanate groups at a molecular terminal thereof.
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2.发明公开
公开(公告)号：EP4129631A1
公开(公告)日：2023-02-08
申请号：EP21774310.3
申请日：2021-03-18
申请人： Ricoh Company, Ltd.
发明人： MIYAZAKI, Kohsuke , NAITO, Hiroyuki , YOKOYAMA, Takumi , SOGAME, Junjiroh , SATOH, Shinichiroh , OYA, Naoki , FUJII, Katsuhiko
IPC分类号： B29C64/393 , B29C64/165 , B29C64/314 , B33Y10/00 , B33Y50/02 , B33Y70/10
摘要： A three-dimensional object producing method including applying an object forming liquid to powder including a base material and an organic material to form a solidified product, and removing the powder, which is deposited on the solidified product, from the solidified product using a powder removal liquid including an organic solvent. The following formulae are satisfied RED value of a non − forming part 1.20 RED value of a forming part > 0.55 The forming part is a portion of the powder to which the object forming liquid is applied, and the RED value of the forming part is a distance between HSP values of the forming part and HSP values of the organic solvent, and the non-forming part is a portion of the powder to which the object forming liquid is not applied, and the RED value of the non-forming part is a distance between HSP values of the non-forming part and the HSP values of the organic solvent.
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公开(公告)号：EP3819708A1
公开(公告)日：2021-05-12
申请号：EP20206020.8
申请日：2020-11-05
申请人： Ricoh Company, Ltd.
IPC分类号： G03G9/113
摘要： A carrier for forming an electrophotographic image is provided. The carrier comprises a core particle and a resin layer coating the core particle. The resin layer contains a chargeable particle A, a conductive particle B, a dispersing agent, and a defoaming agent.
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公开(公告)号：EP3760344A1
公开(公告)日：2021-01-06
申请号：EP20183756.4
申请日：2020-07-02
申请人： Ricoh Company, Ltd.
发明人： SOGAME, Junjiroh , MIYAZAKI, Kohsuke , YOKOYAMA, Takumi , SATOH, Shinichiroh , SASAKI, Takafumi , MIZUTA, Osamu , MIYATA, Hiroyuki , OYA, Naoki
摘要： Provided is a powder material for producing a three-dimensional object including: a base material; a resin; and resin particles, wherein an amount W (mass%) of carbon remaining in the powder material after heating in a vacuum of 10 -2 Pa or lower at 450 degrees C for 2 hours satisfies the following formula: W(mass%)
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公开(公告)号：EP4234125A1
公开(公告)日：2023-08-30
申请号：EP23155084.9
申请日：2023-02-06
申请人： Ricoh Company, Ltd.
摘要： A three-dimensional fabricating powdered material is provided that comprises: a base material comprising an inorganic material and having a mean volume particle diameter of 25 µm or more to 70 µm or less; and an inorganic oxide having a mean volume particle diameter of 120 nm or less, the inorganic oxide attached to the base material.
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公开(公告)号：EP4431204A1
公开(公告)日：2024-09-18
申请号：EP24162869.2
申请日：2024-03-12
申请人： Ricoh Company, Ltd.
IPC分类号： B22F1/052 , B33Y70/00 , C22C1/04 , C22C21/02 , B22F10/14 , B33Y10/00 , B22F1/103 , B22F10/68
CPC分类号： B33Y70/00 , C22C1/0416 , B22F1/052 , B22F10/14 , B33Y10/00 , C22C21/02 , B22F1/103 , B22F10/68
摘要： A powder for forming 3D objects includes a group of particles having an identical composition. The group of the particles includes 50% by mass or greater of aluminum. An oxygen content of the group of the particles is 950 ppm or less. A volume-based particle size frequency distribution of the powder for forming 3D objects has a peak top in a particle diameter range of 40 µm or greater and 70 µm or less, and a peak top in a particle diameter range of 10 µm or greater and 30 µm or less. A ratio (a frequency (%) of the peak top in the particle diameter range of 40 µm or greater and 70 µm or less)/(a frequency (%) of the peak top in the particle diameter range of 10 µm or greater and 30 µm or less) is 1.5 or greater.
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公开(公告)号：EP3629090A1
公开(公告)日：2020-04-01
申请号：EP19198479.8
申请日：2019-09-19
申请人： Ricoh Company Ltd.
摘要： A carrier for forming an electrophotographic image is provided. The carrier comprises carrier particles each comprising a core particle and a coating layer. The coating layer comprises a coating resin and inorganic particles comprising chargeable particles A and conductive particles B. The amount of the inorganic particles is from 195 to 350 parts by mass with respect to 100 parts by mass of the coating resin. The carrier particles consist of small carrier particles (D1 ≤ 25 µm), medium carrier particles (25 µm
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