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1. 发明公开

EP4129898A1 METHOD FOR PRODUCING HEXAGONAL BORON NITRIDE POWDER 审中-实审
公开(公告)号：EP4129898A1
公开(公告)日：2023-02-08
申请号：EP21776413.3
申请日：2021-03-10
申请人： Tokuyama Corporation
发明人： IKEDA, Yuichi , DAIKI, Shota , FUJINAMI, Kyoichi , NAWATA, Teruhiko
IPC分类号： C01B21/064
摘要： Provided is a method for producing, with a small amount of lithium, a hexagonal boron nitride powder containing thick hexagonal boron nitride particles. A method for producing a hexagonal boron nitride powder, including the steps of: preparing a mixed powder which contains an organic compound containing nitrogen atoms, a boron source which contains boron atoms whose molar ratio with respect to the nitrogen atoms is adjusted to be 0.26 or more and 0.67 or less, and an alkali metal in which lithium atoms are adjusted to be in a range of 30 mol% or more and less than 100 mol%, the alkali metal being present such that a molar ratio of the boron atoms with respect to alkali metal atoms contained in the alkali metal is 0.75 or more and 3.35 or less; and heating the mixed powder at a maximum temperature of 1200°C or higher and 1500°C or lower. ( Fig. 3 )

2. 发明公开

EP4303180A1 HEXAGONAL BORON NITRIDE AGGLOMERATED PARTICLES, HEXAGONAL BORON NITRIDE POWDER, RESIN COMPOSITION, AND RESIN SHEET 审中-实审
公开(公告)号：EP4303180A1
公开(公告)日：2024-01-10
申请号：EP22763246.0
申请日：2022-03-01
申请人： Tokuyama Corporation
发明人： DAIKI, Shota , FUJINAMI, Kyouichi , NAWATA, Teruhiko , YOSHIDA, Satoru
IPC分类号： C01B21/064 , C08K3/38 , C08L63/02 , C08L101/00 , H01B3/00 , H01B3/30 , H01B17/56
摘要： Provided are hexagonal boron nitride aggregated particles and hexagonal boron nitride powder, each of which can be filled into a resin to produce a resin composition with an extremely high dielectric strength and thermal conductivity, and to reduce the density of the resin composition. Provided are hexagonal boron nitride aggregated particles, in which aggregated particles of hexagonal boron nitride primary particles have a longer diameter ranging from 5 to 10 µm, a longer diameter/shorter diameter ranging from 1.0 to 1.3, and a circularity within a range from 0.3 to 0.8, and a maximum diameter of primary particles which can be confirmed on the surface of the aggregated particles on an SEM observation image at 10,000 magnification is 4 um or less. Provided is a hexagonal boron nitride powder including aggregated particles of hexagonal boron nitride primary particles, in which a particle size (D 50 ) at a cumulative volume frequency of 50% in a particle size distribution as measured by a wet laser diffraction particle size distribution analysis is from 5 to 150 µm, a volume-based median diameter of pores as measured by a mercury porosimetry is 3.0 um or less, and a content of impurity elements is 500 ppm or less.

3. 发明公开

EP3932858A1 HEXAGONAL BORON NITRIDE POWDER, RESIN COMPOSITION, RESIN SHEET, AND METHOD FOR PRODUCING HEXAGONAL BORON NITRIDE POWDER 审中-公开
公开(公告)号：EP3932858A1
公开(公告)日：2022-01-05
申请号：EP20766617.3
申请日：2020-02-28
申请人： Tokuyama Corporation , Shinshu University
发明人： IKEDA, Yuichi , DAIKI, Shota , FUJINAMI, Kyoichi , NAWATA, Teruhiko , TESHIMA, Katsuya , YAMADA, Tetsuya
IPC分类号： C01B21/064 , C08J5/18 , C08K3/38 , C08K7/04 , C08L101/00 , C30B9/02 , C30B29/38
摘要： It is an object to achieve a resin sheet having high thermal conductance and high dielectric strength. Hexagonal boron nitride powder in accordance with an aspect of the present invention includes hexagonal boron nitride agglomerate particles each including agglomerated hexagonal boron nitride primary particles, and has a specific surface area of not less than 0.5 m 2 /g and not more than 5.0 m 2 /g. The hexagonal boron nitride primary particles each have a long diameter of not less than 0.6 µm and not more than 4.0 µm and an aspect ratio of not less than 1.5 and not more than 5.0. ( Fig. 1 )

4. 发明授权

EP3409643B1 ALUMINUM NITRIDE PARTICLE 有权
公开(公告)号：EP3409643B1
公开(公告)日：2020-11-25
申请号：EP17744468.4
申请日：2017-01-25
申请人： Tokuyama Corporation
发明人： KURAMOTO, Akimasa , YAMAMOTO, Kikuo , OU, Mou , FUJII, Saiko , KANECHIKA, Yukihiro , NAWATA, Teruhiko
IPC分类号： C01B21/072 , C08K3/28 , C08L101/00 , C09C1/40

5. 发明公开

EP4053073A1 METHOD FOR PRODUCING HEXAGONAL BORON NITRIDE POWDER, AND HEXAGONAL BORON NITRIDE POWDER 审中-公开
公开(公告)号：EP4053073A1
公开(公告)日：2022-09-07
申请号：EP20881522.5
申请日：2020-10-20
申请人： Tokuyama Corporation , Shinshu University
发明人： IKEDA, Yuichi , DAIKI, Shota , FUJINAMI, Kyoichi , NAWATA, Teruhiko , TESHIMA, Katsuya , YAMADA, Tetsuya
IPC分类号： C01B21/064 , C08L101/00 , C08K3/38
摘要： Provided is a production method which makes it possible to improve a filling property, with respect to a resin, of a hexagonal boron nitride powder which contains hexagonal boron nitride particles each having a low aspect ratio, while maintaining low thermal conduction anisotropy of the hexagonal boron nitride powder. A method of producing a hexagonal boron nitride powder includes disintegrating, by a means which substantially does not involve pulverization of primary particles, a hexagonal boron nitride raw material powder which contains (i) hexagonal boron nitride particles each having an aspect ratio of 1.5 to 5.0 and (ii) an aggregate that contains hexagonal boron nitride particles each having an aspect ratio of more than 5.0.

6. 发明公开

EP3409643A1 ALUMINUM NITRIDE PARTICLE 有权
公开(公告)号：EP3409643A1
公开(公告)日：2018-12-05
申请号：EP17744468.4
申请日：2017-01-25
申请人： Tokuyama Corporation
发明人： KURAMOTO, Akimasa , YAMAMOTO, Kikuo , OU, Mou , FUJII, Saiko , KANECHIKA, Yukihiro , NAWATA, Teruhiko
IPC分类号： C01B21/072 , C08K3/28 , C08L101/00
CPC分类号： C01B21/072 , C08K3/28 , C08L101/00
摘要： To provide an aluminum nitride particle having a hexagonal columnar barrel part and bowl-like projection parts at both ends of the columnar part, wherein the long diameter (D) of the barrel part is 10 to 250 µm, the ratio (L 1 /D) of the distance (L 1 ) between the apexes of the two projection pars to the long diameter (D) of the barrel part is 0.7 to 1.3, and the percentage of the length or thickness (L 2 ) of the barrel part to the distance (L 1 ) between the apexes of the two projection parts is 10 to 60 %. The aluminum nitride particle can provide high heat conductivity and excellent electric insulation to a resin when it is filled into the resin.

7. 发明公开

EP1849893A1 METAL FLUORIDE SINGLE CRYSTAL PULLING APPARATUS AND PROCESS FOR PRODUCING METAL FLUORIDE SINGLE CRYSTAL WITH THE APPARATUS 审中-公开
标题翻译：设备绘制金属氟化物单晶和工艺用于生产金属氟化物单晶与设备
公开(公告)号：EP1849893A1
公开(公告)日：2007-10-31
申请号：EP05816637.2
申请日：2005-12-16
申请人： TOKUYAMA CORPORATION
发明人： NAWATA, Teruhiko , YASUMURA, Ken , YANAGI, Hiroyuki , NISHIJIMA, Eiichi
IPC分类号： C30B15/12 , C30B29/12
CPC分类号： C30B15/02 , C30B15/12 , C30B29/12
摘要： A metal fluoride single crystal pulling apparatus that upward pulling initiation through termination, in the state of shallow melt capable of highly effective inhibition of scatterer formation, can perform stable growth of single crystal and can suppress any mixing of air bubbles and occurrence of crystal break during crystal growth, etc; and a process for producing a metal fluoride single crystal therewith. As a crucible for accommodating a melt of raw metal fluoride, use is made of a double structured crucible composed of an outer crucible and an inner crucible. In the upward pulling of single crystal, the accommodation depth of inner crucible relative to the outer crucible is increased in accordance with any decrease of melt accommodated in the inner crucible according to the growth of single crystal, so that the melt accommodated in the outer crucible is fed into the inner crucible to thereby maintain the amount of melt accommodated in the inner crucible within a given range. Further, at the position of an opening that upward opens any gap space between an external surface of outer crucible and an internal surface of inner crucible, or an interstice, situated below the opening, between a side wall internal surface of outer crucible and a side wall external surface of inner crucible, there is disposed a cutoff member that cuts off at least part of the position.
摘要翻译：金属氟化物单晶提拉装置也向上通过终止拉起始，在能够高度有效的抑制的散射体形成的浅熔体的状态下，可以执行单晶的稳定生长和期间，能够抑制气泡和晶体的断线发生的任何混合晶体生长，等; 和用于与制造金属氟化物单晶存在的方法。作为用于容纳的原料金属氟化物的熔体的坩埚中，使用了在外坩埚和内坩埚构成的双重结构的坩埚。在向上提拉单晶的，内坩埚相对于所述外坩埚的容纳深度增加在雅舞蹈与容纳在坩埚内雅丁单晶的生长熔体的任何降低，所以DASS模头熔融容纳在外坩埚被馈送到内坩埚，从而保持熔融的容纳在所述内坩埚的给定范围内的量。另外，在开口的位置的确向上打开以外坩埚的外表面之间的内坩埚的内表面的任何间隙的空间，或在空隙，位于开口部的下方，外坩埚的侧壁内表面和一个侧之间内坩埚的壁的外表面，有一个截止设置构件确实切断位置的至少一部分。

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